json.c File Reference

#include "postgres.h"
#include "access/htup_details.h"
#include "access/transam.h"
#include "catalog/pg_type.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "lib/stringinfo.h"
#include "libpq/pqformat.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "parser/parse_coerce.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/lsyscache.h"
#include "utils/json.h"
#include "utils/jsonapi.h"
#include "utils/typcache.h"
#include "utils/syscache.h"

Include dependency graph for json.c:

Go to the source code of this file.

Data Structures
struct	JsonAggState

Macros
#define	JSON_ALPHANUMERIC_CHAR(c)

Typedefs
typedef struct JsonAggState	JsonAggState

Enumerations
enum	JsonParseContext {   JSON_PARSE_VALUE, JSON_PARSE_STRING, JSON_PARSE_ARRAY_START, JSON_PARSE_ARRAY_NEXT,   JSON_PARSE_OBJECT_START, JSON_PARSE_OBJECT_LABEL, JSON_PARSE_OBJECT_NEXT, JSON_PARSE_OBJECT_COMMA,   JSON_PARSE_END }
enum	JsonTypeCategory {   JSONTYPE_NULL, JSONTYPE_BOOL, JSONTYPE_NUMERIC, JSONTYPE_DATE,   JSONTYPE_TIMESTAMP, JSONTYPE_TIMESTAMPTZ, JSONTYPE_JSON, JSONTYPE_ARRAY,   JSONTYPE_COMPOSITE, JSONTYPE_CAST, JSONTYPE_OTHER }

Functions
static void	json_lex (JsonLexContext *lex)
static void	json_lex_string (JsonLexContext *lex)
static void	json_lex_number (JsonLexContext *lex, char *s, bool *num_err, int *total_len)
static void	parse_scalar (JsonLexContext *lex, JsonSemAction *sem)
static void	parse_object_field (JsonLexContext *lex, JsonSemAction *sem)
static void	parse_object (JsonLexContext *lex, JsonSemAction *sem)
static void	parse_array_element (JsonLexContext *lex, JsonSemAction *sem)
static void	parse_array (JsonLexContext *lex, JsonSemAction *sem)
static void	report_parse_error (JsonParseContext ctx, JsonLexContext *lex) pg_attribute_noreturn()
static void	report_invalid_token (JsonLexContext *lex) pg_attribute_noreturn()
static int	report_json_context (JsonLexContext *lex)
static char *	extract_mb_char (char *s)
static void	composite_to_json (Datum composite, StringInfo result, bool use_line_feeds)
static void	array_dim_to_json (StringInfo result, int dim, int ndims, int *dims, Datum *vals, bool *nulls, int *valcount, JsonTypeCategory tcategory, Oid outfuncoid, bool use_line_feeds)
static void	array_to_json_internal (Datum array, StringInfo result, bool use_line_feeds)
static void	json_categorize_type (Oid typoid, JsonTypeCategory *tcategory, Oid *outfuncoid)
static void	datum_to_json (Datum val, bool is_null, StringInfo result, JsonTypeCategory tcategory, Oid outfuncoid, bool key_scalar)
static void	add_json (Datum val, bool is_null, StringInfo result, Oid val_type, bool key_scalar)
static text *	catenate_stringinfo_string (StringInfo buffer, const char *addon)
static JsonTokenType	lex_peek (JsonLexContext *lex)
static bool	lex_accept (JsonLexContext *lex, JsonTokenType token, char **lexeme)
static void	lex_expect (JsonParseContext ctx, JsonLexContext *lex, JsonTokenType token)
bool	IsValidJsonNumber (const char *str, int len)
Datum	json_in (PG_FUNCTION_ARGS)
Datum	json_out (PG_FUNCTION_ARGS)
Datum	json_send (PG_FUNCTION_ARGS)
Datum	json_recv (PG_FUNCTION_ARGS)
JsonLexContext *	makeJsonLexContext (text *json, bool need_escapes)
JsonLexContext *	makeJsonLexContextCstringLen (char *json, int len, bool need_escapes)
void	pg_parse_json (JsonLexContext *lex, JsonSemAction *sem)
int	json_count_array_elements (JsonLexContext *lex)
char *	JsonEncodeDateTime (char *buf, Datum value, Oid typid)
Datum	array_to_json (PG_FUNCTION_ARGS)
Datum	array_to_json_pretty (PG_FUNCTION_ARGS)
Datum	row_to_json (PG_FUNCTION_ARGS)
Datum	row_to_json_pretty (PG_FUNCTION_ARGS)
Datum	to_json (PG_FUNCTION_ARGS)
Datum	json_agg_transfn (PG_FUNCTION_ARGS)
Datum	json_agg_finalfn (PG_FUNCTION_ARGS)
Datum	json_object_agg_transfn (PG_FUNCTION_ARGS)
Datum	json_object_agg_finalfn (PG_FUNCTION_ARGS)
Datum	json_build_object (PG_FUNCTION_ARGS)
Datum	json_build_object_noargs (PG_FUNCTION_ARGS)
Datum	json_build_array (PG_FUNCTION_ARGS)
Datum	json_build_array_noargs (PG_FUNCTION_ARGS)
Datum	json_object (PG_FUNCTION_ARGS)
Datum	json_object_two_arg (PG_FUNCTION_ARGS)
void	escape_json (StringInfo buf, const char *str)
Datum	json_typeof (PG_FUNCTION_ARGS)

Variables
static JsonSemAction	nullSemAction

Macro Definition Documentation

JSON_ALPHANUMERIC_CHAR

#define JSON_ALPHANUMERIC_CHAR

(

c

)

Value:

(((c) >= 'a' && (c) <= 'z') || \
     ((c) >= 'A' && (c) <= 'Z') || \
     ((c) >= '0' && (c) <= '9') || \
     (c) == '_' || \
     IS_HIGHBIT_SET(c))

Definition at line 180 of file json.c.

Referenced by json_lex(), and json_lex_number().

Typedef Documentation

JsonAggState

typedef struct JsonAggState JsonAggState

Enumeration Type Documentation

JsonParseContext

enum JsonParseContext

Enumerator
JSON_PARSE_VALUE
JSON_PARSE_STRING
JSON_PARSE_ARRAY_START
JSON_PARSE_ARRAY_NEXT
JSON_PARSE_OBJECT_START
JSON_PARSE_OBJECT_LABEL
JSON_PARSE_OBJECT_NEXT
JSON_PARSE_OBJECT_COMMA
JSON_PARSE_END

Definition at line 41 of file json.c.

{
    JSON_PARSE_VALUE,           /* expecting a value */
    JSON_PARSE_STRING,          /* expecting a string (for a field name) */
    JSON_PARSE_ARRAY_START,     /* saw '[', expecting value or ']' */
    JSON_PARSE_ARRAY_NEXT,      /* saw array element, expecting ',' or ']' */
    JSON_PARSE_OBJECT_START,    /* saw '{', expecting label or '}' */
    JSON_PARSE_OBJECT_LABEL,    /* saw object label, expecting ':' */
    JSON_PARSE_OBJECT_NEXT,     /* saw object value, expecting ',' or '}' */
    JSON_PARSE_OBJECT_COMMA,    /* saw object ',', expecting next label */
    JSON_PARSE_END              /* saw the end of a document, expect nothing */
} JsonParseContext;

JsonTypeCategory

enum JsonTypeCategory

Enumerator
JSONTYPE_NULL
JSONTYPE_BOOL
JSONTYPE_NUMERIC
JSONTYPE_DATE
JSONTYPE_TIMESTAMP
JSONTYPE_TIMESTAMPTZ
JSONTYPE_JSON
JSONTYPE_ARRAY
JSONTYPE_COMPOSITE
JSONTYPE_CAST
JSONTYPE_OTHER

Definition at line 54 of file json.c.

{
    JSONTYPE_NULL,              /* null, so we didn't bother to identify */
    JSONTYPE_BOOL,              /* boolean (built-in types only) */
    JSONTYPE_NUMERIC,           /* numeric (ditto) */
    JSONTYPE_DATE,              /* we use special formatting for datetimes */
    JSONTYPE_TIMESTAMP,
    JSONTYPE_TIMESTAMPTZ,
    JSONTYPE_JSON,              /* JSON itself (and JSONB) */
    JSONTYPE_ARRAY,             /* array */
    JSONTYPE_COMPOSITE,         /* composite */
    JSONTYPE_CAST,              /* something with an explicit cast to JSON */
    JSONTYPE_OTHER              /* all else */
} JsonTypeCategory;

Function Documentation

add_json()

static void add_json ( Datum  val, bool  is_null, StringInfo  result, Oid  val_type, bool  key_scalar  )

static

Definition at line 1820 of file json.c.

References datum_to_json(), ereport, errcode(), errmsg(), ERROR, InvalidOid, json_categorize_type(), and JSONTYPE_NULL.

Referenced by json_build_array(), and json_build_object().

{
    JsonTypeCategory tcategory;
    Oid         outfuncoid;

    if (val_type == InvalidOid)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("could not determine input data type")));

    if (is_null)
    {
        tcategory = JSONTYPE_NULL;
        outfuncoid = InvalidOid;
    }
    else
        json_categorize_type(val_type,
                             &tcategory, &outfuncoid);

    datum_to_json(val, is_null, result, tcategory, outfuncoid, key_scalar);
}

array_dim_to_json()

static void array_dim_to_json ( StringInfo  result, int  dim, int  ndims, int *  dims, Datum *  vals, bool *  nulls, int *  valcount, JsonTypeCategory  tcategory, Oid  outfuncoid, bool  use_line_feeds  )

static

Definition at line 1658 of file json.c.

References appendStringInfoChar(), appendStringInfoString(), Assert, datum_to_json(), and i.

Referenced by array_to_json_internal().

{
    int         i;
    const char *sep;

    Assert(dim < ndims);

    sep = use_line_feeds ? ",\n " : ",";

    appendStringInfoChar(result, '[');

    for (i = 1; i <= dims[dim]; i++)
    {
        if (i > 1)
            appendStringInfoString(result, sep);

        if (dim + 1 == ndims)
        {
            datum_to_json(vals[*valcount], nulls[*valcount], result, tcategory,
                          outfuncoid, false);
            (*valcount)++;
        }
        else
        {
            /*
             * Do we want line feeds on inner dimensions of arrays? For now
             * we'll say no.
             */
            array_dim_to_json(result, dim + 1, ndims, dims, vals, nulls,
                              valcount, tcategory, outfuncoid, false);
        }
    }

    appendStringInfoChar(result, ']');
}

array_to_json()

Datum array_to_json

(

PG_FUNCTION_ARGS

)

Definition at line 1847 of file json.c.

References array_to_json_internal(), cstring_to_text_with_len(), StringInfoData::data, StringInfoData::len, makeStringInfo(), PG_GETARG_DATUM, and PG_RETURN_TEXT_P.

{
    Datum       array = PG_GETARG_DATUM(0);
    StringInfo  result;

    result = makeStringInfo();

    array_to_json_internal(array, result, false);

    PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}

array_to_json_internal()

static void array_to_json_internal ( Datum  array, StringInfo  result, bool  use_line_feeds  )

static

Definition at line 1700 of file json.c.

References appendStringInfoString(), ARR_DIMS, ARR_ELEMTYPE, ARR_NDIM, array_dim_to_json(), ArrayGetNItems(), DatumGetArrayTypeP, deconstruct_array(), get_typlenbyvalalign(), json_categorize_type(), pfree(), typalign, typbyval, and typlen.

Referenced by array_to_json(), array_to_json_pretty(), and datum_to_json().

{
    ArrayType  *v = DatumGetArrayTypeP(array);
    Oid         element_type = ARR_ELEMTYPE(v);
    int        *dim;
    int         ndim;
    int         nitems;
    int         count = 0;
    Datum      *elements;
    bool       *nulls;
    int16       typlen;
    bool        typbyval;
    char        typalign;
    JsonTypeCategory tcategory;
    Oid         outfuncoid;

    ndim = ARR_NDIM(v);
    dim = ARR_DIMS(v);
    nitems = ArrayGetNItems(ndim, dim);

    if (nitems <= 0)
    {
        appendStringInfoString(result, "[]");
        return;
    }

    get_typlenbyvalalign(element_type,
                         &typlen, &typbyval, &typalign);

    json_categorize_type(element_type,
                         &tcategory, &outfuncoid);

    deconstruct_array(v, element_type, typlen, typbyval,
                      typalign, &elements, &nulls,
                      &nitems);

    array_dim_to_json(result, 0, ndim, dim, elements, nulls, &count, tcategory,
                      outfuncoid, use_line_feeds);

    pfree(elements);
    pfree(nulls);
}

array_to_json_pretty()

Datum array_to_json_pretty

(

PG_FUNCTION_ARGS

)

Definition at line 1863 of file json.c.

References array_to_json_internal(), cstring_to_text_with_len(), StringInfoData::data, StringInfoData::len, makeStringInfo(), PG_GETARG_BOOL, PG_GETARG_DATUM, and PG_RETURN_TEXT_P.

{
    Datum       array = PG_GETARG_DATUM(0);
    bool        use_line_feeds = PG_GETARG_BOOL(1);
    StringInfo  result;

    result = makeStringInfo();

    array_to_json_internal(array, result, use_line_feeds);

    PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}

catenate_stringinfo_string()

static text * catenate_stringinfo_string ( StringInfo  buffer, const char *  addon  )

static

Definition at line 2157 of file json.c.

References StringInfoData::data, StringInfoData::len, palloc(), SET_VARSIZE, VARDATA, and VARHDRSZ.

Referenced by json_agg_finalfn(), and json_object_agg_finalfn().

{
    /* custom version of cstring_to_text_with_len */
    int         buflen = buffer->len;
    int         addlen = strlen(addon);
    text       *result = (text *) palloc(buflen + addlen + VARHDRSZ);

    SET_VARSIZE(result, buflen + addlen + VARHDRSZ);
    memcpy(VARDATA(result), buffer->data, buflen);
    memcpy(VARDATA(result) + buflen, addon, addlen);

    return result;
}

composite_to_json()

static void composite_to_json ( Datum  composite, StringInfo  result, bool  use_line_feeds  )

static

Definition at line 1747 of file json.c.

References appendStringInfoChar(), appendStringInfoString(), attname, datum_to_json(), DatumGetHeapTupleHeader, escape_json(), heap_getattr, HeapTupleHeaderGetDatumLength, HeapTupleHeaderGetTypeId, HeapTupleHeaderGetTypMod, i, InvalidOid, json_categorize_type(), JSONTYPE_NULL, lookup_rowtype_tupdesc(), NameStr, tupleDesc::natts, ReleaseTupleDesc, HeapTupleData::t_data, HeapTupleData::t_len, TupleDescAttr, and val.

Referenced by datum_to_json(), row_to_json(), and row_to_json_pretty().

{
    HeapTupleHeader td;
    Oid         tupType;
    int32       tupTypmod;
    TupleDesc   tupdesc;
    HeapTupleData tmptup,
               *tuple;
    int         i;
    bool        needsep = false;
    const char *sep;

    sep = use_line_feeds ? ",\n " : ",";

    td = DatumGetHeapTupleHeader(composite);

    /* Extract rowtype info and find a tupdesc */
    tupType = HeapTupleHeaderGetTypeId(td);
    tupTypmod = HeapTupleHeaderGetTypMod(td);
    tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);

    /* Build a temporary HeapTuple control structure */
    tmptup.t_len = HeapTupleHeaderGetDatumLength(td);
    tmptup.t_data = td;
    tuple = &tmptup;

    appendStringInfoChar(result, '{');

    for (i = 0; i < tupdesc->natts; i++)
    {
        Datum       val;
        bool        isnull;
        char       *attname;
        JsonTypeCategory tcategory;
        Oid         outfuncoid;
        Form_pg_attribute att = TupleDescAttr(tupdesc, i);

        if (att->attisdropped)
            continue;

        if (needsep)
            appendStringInfoString(result, sep);
        needsep = true;

        attname = NameStr(att->attname);
        escape_json(result, attname);
        appendStringInfoChar(result, ':');

        val = heap_getattr(tuple, i + 1, tupdesc, &isnull);

        if (isnull)
        {
            tcategory = JSONTYPE_NULL;
            outfuncoid = InvalidOid;
        }
        else
            json_categorize_type(att->atttypid, &tcategory, &outfuncoid);

        datum_to_json(val, isnull, result, tcategory, outfuncoid, false);
    }

    appendStringInfoChar(result, '}');
    ReleaseTupleDesc(tupdesc);
}

datum_to_json()

static void datum_to_json ( Datum  val, bool  is_null, StringInfo  result, JsonTypeCategory  tcategory, Oid  outfuncoid, bool  key_scalar  )

static

Definition at line 1450 of file json.c.

References appendStringInfo(), appendStringInfoString(), array_to_json_internal(), Assert, buf, check_stack_depth(), composite_to_json(), DatumGetBool, DatumGetTextPP, ereport, errcode(), errmsg(), ERROR, escape_json(), IsValidJsonNumber(), JsonEncodeDateTime(), JSONTYPE_ARRAY, JSONTYPE_BOOL, JSONTYPE_CAST, JSONTYPE_COMPOSITE, JSONTYPE_DATE, JSONTYPE_JSON, JSONTYPE_NUMERIC, JSONTYPE_TIMESTAMP, JSONTYPE_TIMESTAMPTZ, MAXDATELEN, OidFunctionCall1, OidOutputFunctionCall(), pfree(), and text_to_cstring().

Referenced by add_json(), array_dim_to_json(), composite_to_json(), json_agg_transfn(), json_object_agg_transfn(), and to_json().

{
    char       *outputstr;
    text       *jsontext;

    check_stack_depth();

    /* callers are expected to ensure that null keys are not passed in */
    Assert(!(key_scalar && is_null));

    if (is_null)
    {
        appendStringInfoString(result, "null");
        return;
    }

    if (key_scalar &&
        (tcategory == JSONTYPE_ARRAY ||
         tcategory == JSONTYPE_COMPOSITE ||
         tcategory == JSONTYPE_JSON ||
         tcategory == JSONTYPE_CAST))
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("key value must be scalar, not array, composite, or json")));

    switch (tcategory)
    {
        case JSONTYPE_ARRAY:
            array_to_json_internal(val, result, false);
            break;
        case JSONTYPE_COMPOSITE:
            composite_to_json(val, result, false);
            break;
        case JSONTYPE_BOOL:
            outputstr = DatumGetBool(val) ? "true" : "false";
            if (key_scalar)
                escape_json(result, outputstr);
            else
                appendStringInfoString(result, outputstr);
            break;
        case JSONTYPE_NUMERIC:
            outputstr = OidOutputFunctionCall(outfuncoid, val);

            /*
             * Don't call escape_json for a non-key if it's a valid JSON
             * number.
             */
            if (!key_scalar && IsValidJsonNumber(outputstr, strlen(outputstr)))
                appendStringInfoString(result, outputstr);
            else
                escape_json(result, outputstr);
            pfree(outputstr);
            break;
        case JSONTYPE_DATE:
            {
                char        buf[MAXDATELEN + 1];

                JsonEncodeDateTime(buf, val, DATEOID);
                appendStringInfo(result, "\"%s\"", buf);
            }
            break;
        case JSONTYPE_TIMESTAMP:
            {
                char        buf[MAXDATELEN + 1];

                JsonEncodeDateTime(buf, val, TIMESTAMPOID);
                appendStringInfo(result, "\"%s\"", buf);
            }
            break;
        case JSONTYPE_TIMESTAMPTZ:
            {
                char        buf[MAXDATELEN + 1];

                JsonEncodeDateTime(buf, val, TIMESTAMPTZOID);
                appendStringInfo(result, "\"%s\"", buf);
            }
            break;
        case JSONTYPE_JSON:
            /* JSON and JSONB output will already be escaped */
            outputstr = OidOutputFunctionCall(outfuncoid, val);
            appendStringInfoString(result, outputstr);
            pfree(outputstr);
            break;
        case JSONTYPE_CAST:
            /* outfuncoid refers to a cast function, not an output function */
            jsontext = DatumGetTextPP(OidFunctionCall1(outfuncoid, val));
            outputstr = text_to_cstring(jsontext);
            appendStringInfoString(result, outputstr);
            pfree(outputstr);
            pfree(jsontext);
            break;
        default:
            outputstr = OidOutputFunctionCall(outfuncoid, val);
            escape_json(result, outputstr);
            pfree(outputstr);
            break;
    }
}

escape_json()

void escape_json	(	StringInfo	buf,
		const char *	str
	)

Definition at line 2461 of file json.c.

References appendStringInfo(), appendStringInfoCharMacro, and appendStringInfoString().

Referenced by composite_to_json(), datum_to_json(), escape_yaml(), ExplainDummyGroup(), ExplainOpenGroup(), ExplainProperty(), ExplainPropertyList(), ExplainPropertyListNested(), hstore_to_json(), hstore_to_json_loose(), json_object(), json_object_two_arg(), jsonb_put_escaped_value(), sn_object_field_start(), sn_scalar(), transform_string_values_object_field_start(), and transform_string_values_scalar().

{
    const char *p;

    appendStringInfoCharMacro(buf, '"');
    for (p = str; *p; p++)
    {
        switch (*p)
        {
            case '\b':
                appendStringInfoString(buf, "\\b");
                break;
            case '\f':
                appendStringInfoString(buf, "\\f");
                break;
            case '\n':
                appendStringInfoString(buf, "\\n");
                break;
            case '\r':
                appendStringInfoString(buf, "\\r");
                break;
            case '\t':
                appendStringInfoString(buf, "\\t");
                break;
            case '"':
                appendStringInfoString(buf, "\\\"");
                break;
            case '\\':
                appendStringInfoString(buf, "\\\\");
                break;
            default:
                if ((unsigned char) *p < ' ')
                    appendStringInfo(buf, "\\u%04x", (int) *p);
                else
                    appendStringInfoCharMacro(buf, *p);
                break;
        }
    }
    appendStringInfoCharMacro(buf, '"');
}

extract_mb_char()

static char * extract_mb_char ( char *  s )

static

Definition at line 1327 of file json.c.

References palloc(), and pg_mblen().

Referenced by json_lex_string().

{
    char       *res;
    int         len;

    len = pg_mblen(s);
    res = palloc(len + 1);
    memcpy(res, s, len);
    res[len] = '\0';

    return res;
}

IsValidJsonNumber()

bool IsValidJsonNumber	(	const char *	str,
		int	len
	)

Definition at line 193 of file json.c.

References JsonLexContext::input, JsonLexContext::input_length, and json_lex_number().

Referenced by datum_to_json(), hstore_to_json_loose(), and hstore_to_jsonb_loose().

{
    bool        numeric_error;
    int         total_len;
    JsonLexContext dummy_lex;

    if (len <= 0)
        return false;

    /*
     * json_lex_number expects a leading  '-' to have been eaten already.
     *
     * having to cast away the constness of str is ugly, but there's not much
     * easy alternative.
     */
    if (*str == '-')
    {
        dummy_lex.input = (char *) str + 1;
        dummy_lex.input_length = len - 1;
    }
    else
    {
        dummy_lex.input = (char *) str;
        dummy_lex.input_length = len;
    }

    json_lex_number(&dummy_lex, dummy_lex.input, &numeric_error, &total_len);

    return (!numeric_error) && (total_len == dummy_lex.input_length);
}

json_agg_finalfn()

Datum json_agg_finalfn

(

PG_FUNCTION_ARGS

)

Definition at line 2018 of file json.c.

References AggCheckCallContext(), Assert, catenate_stringinfo_string(), PG_ARGISNULL, PG_GETARG_POINTER, PG_RETURN_NULL, PG_RETURN_TEXT_P, and JsonAggState::str.

{
    JsonAggState *state;

    /* cannot be called directly because of internal-type argument */
    Assert(AggCheckCallContext(fcinfo, NULL));

    state = PG_ARGISNULL(0) ?
        NULL :
        (JsonAggState *) PG_GETARG_POINTER(0);

    /* NULL result for no rows in, as is standard with aggregates */
    if (state == NULL)
        PG_RETURN_NULL();

    /* Else return state with appropriate array terminator added */
    PG_RETURN_TEXT_P(catenate_stringinfo_string(state->str, "]"));
}

json_agg_transfn()

Datum json_agg_transfn

(

PG_FUNCTION_ARGS

)

Definition at line 1942 of file json.c.

References AggCheckCallContext(), appendStringInfoChar(), appendStringInfoString(), datum_to_json(), elog, ereport, errcode(), errmsg(), ERROR, get_fn_expr_argtype(), InvalidOid, json_categorize_type(), JSONTYPE_ARRAY, JSONTYPE_COMPOSITE, JSONTYPE_NULL, makeStringInfo(), MemoryContextSwitchTo(), palloc(), PG_ARGISNULL, PG_GETARG_DATUM, PG_GETARG_POINTER, PG_RETURN_POINTER, JsonAggState::str, val, JsonAggState::val_category, and JsonAggState::val_output_func.

{
    MemoryContext aggcontext,
                oldcontext;
    JsonAggState *state;
    Datum       val;

    if (!AggCheckCallContext(fcinfo, &aggcontext))
    {
        /* cannot be called directly because of internal-type argument */
        elog(ERROR, "json_agg_transfn called in non-aggregate context");
    }

    if (PG_ARGISNULL(0))
    {
        Oid         arg_type = get_fn_expr_argtype(fcinfo->flinfo, 1);

        if (arg_type == InvalidOid)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                     errmsg("could not determine input data type")));

        /*
         * Make this state object in a context where it will persist for the
         * duration of the aggregate call.  MemoryContextSwitchTo is only
         * needed the first time, as the StringInfo routines make sure they
         * use the right context to enlarge the object if necessary.
         */
        oldcontext = MemoryContextSwitchTo(aggcontext);
        state = (JsonAggState *) palloc(sizeof(JsonAggState));
        state->str = makeStringInfo();
        MemoryContextSwitchTo(oldcontext);

        appendStringInfoChar(state->str, '[');
        json_categorize_type(arg_type, &state->val_category,
                             &state->val_output_func);
    }
    else
    {
        state = (JsonAggState *) PG_GETARG_POINTER(0);
        appendStringInfoString(state->str, ", ");
    }

    /* fast path for NULLs */
    if (PG_ARGISNULL(1))
    {
        datum_to_json((Datum) 0, true, state->str, JSONTYPE_NULL,
                      InvalidOid, false);
        PG_RETURN_POINTER(state);
    }

    val = PG_GETARG_DATUM(1);

    /* add some whitespace if structured type and not first item */
    if (!PG_ARGISNULL(0) &&
        (state->val_category == JSONTYPE_ARRAY ||
         state->val_category == JSONTYPE_COMPOSITE))
    {
        appendStringInfoString(state->str, "\n ");
    }

    datum_to_json(val, false, state->str, state->val_category,
                  state->val_output_func, false);

    /*
     * The transition type for json_agg() is declared to be "internal", which
     * is a pass-by-value type the same size as a pointer.  So we can safely
     * pass the JsonAggState pointer through nodeAgg.c's machinations.
     */
    PG_RETURN_POINTER(state);
}

json_build_array()

Datum json_build_array

(

PG_FUNCTION_ARGS

)

Definition at line 2239 of file json.c.

References add_json(), appendStringInfoChar(), appendStringInfoString(), generate_unaccent_rules::args, cstring_to_text_with_len(), StringInfoData::data, extract_variadic_args(), i, StringInfoData::len, makeStringInfo(), PG_RETURN_NULL, PG_RETURN_TEXT_P, and types.

{
    int         nargs;
    int         i;
    const char *sep = "";
    StringInfo  result;
    Datum      *args;
    bool       *nulls;
    Oid        *types;

    /* fetch argument values to build the array */
    nargs = extract_variadic_args(fcinfo, 0, false, &args, &types, &nulls);

    if (nargs < 0)
        PG_RETURN_NULL();

    result = makeStringInfo();

    appendStringInfoChar(result, '[');

    for (i = 0; i < nargs; i++)
    {
        appendStringInfoString(result, sep);
        sep = ", ";
        add_json(args[i], nulls[i], result, types[i], false);
    }

    appendStringInfoChar(result, ']');

    PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}

json_build_array_noargs()

Datum json_build_array_noargs

(

PG_FUNCTION_ARGS

)

Definition at line 2275 of file json.c.

References cstring_to_text_with_len(), and PG_RETURN_TEXT_P.

{
    PG_RETURN_TEXT_P(cstring_to_text_with_len("[]", 2));
}

json_build_object()

Datum json_build_object

(

PG_FUNCTION_ARGS

)

Definition at line 2175 of file json.c.

References add_json(), appendStringInfoChar(), appendStringInfoString(), generate_unaccent_rules::args, cstring_to_text_with_len(), StringInfoData::data, ereport, errcode(), errhint(), errmsg(), ERROR, extract_variadic_args(), i, StringInfoData::len, makeStringInfo(), PG_NARGS, PG_RETURN_NULL, PG_RETURN_TEXT_P, and types.

{
    int         nargs = PG_NARGS();
    int         i;
    const char *sep = "";
    StringInfo  result;
    Datum      *args;
    bool       *nulls;
    Oid        *types;

    /* fetch argument values to build the object */
    nargs = extract_variadic_args(fcinfo, 0, false, &args, &types, &nulls);

    if (nargs < 0)
        PG_RETURN_NULL();

    if (nargs % 2 != 0)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("argument list must have even number of elements"),
                 errhint("The arguments of json_build_object() must consist of alternating keys and values.")));

    result = makeStringInfo();

    appendStringInfoChar(result, '{');

    for (i = 0; i < nargs; i += 2)
    {
        appendStringInfoString(result, sep);
        sep = ", ";

        /* process key */
        if (nulls[i])
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                     errmsg("argument %d cannot be null", i + 1),
                     errhint("Object keys should be text.")));

        add_json(args[i], false, result, types[i], true);

        appendStringInfoString(result, " : ");

        /* process value */
        add_json(args[i + 1], nulls[i + 1], result, types[i + 1], false);
    }

    appendStringInfoChar(result, '}');

    PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}

json_build_object_noargs()

Datum json_build_object_noargs

(

PG_FUNCTION_ARGS

)

Definition at line 2230 of file json.c.

References cstring_to_text_with_len(), and PG_RETURN_TEXT_P.

{
    PG_RETURN_TEXT_P(cstring_to_text_with_len("{}", 2));
}

json_categorize_type()

static void json_categorize_type ( Oid  typoid, JsonTypeCategory *  tcategory, Oid *  outfuncoid  )

static

Definition at line 1348 of file json.c.

References COERCION_EXPLICIT, COERCION_PATH_FUNC, find_coercion_pathway(), FirstNormalObjectId, get_element_type(), getBaseType(), getTypeOutputInfo(), InvalidOid, JSONTYPE_ARRAY, JSONTYPE_BOOL, JSONTYPE_CAST, JSONTYPE_COMPOSITE, JSONTYPE_DATE, JSONTYPE_JSON, JSONTYPE_NUMERIC, JSONTYPE_OTHER, JSONTYPE_TIMESTAMP, JSONTYPE_TIMESTAMPTZ, OidIsValid, and type_is_rowtype().

Referenced by add_json(), array_to_json_internal(), composite_to_json(), json_agg_transfn(), json_object_agg_transfn(), and to_json().

{
    bool        typisvarlena;

    /* Look through any domain */
    typoid = getBaseType(typoid);

    *outfuncoid = InvalidOid;

    /*
     * We need to get the output function for everything except date and
     * timestamp types, array and composite types, booleans, and non-builtin
     * types where there's a cast to json.
     */

    switch (typoid)
    {
        case BOOLOID:
            *tcategory = JSONTYPE_BOOL;
            break;

        case INT2OID:
        case INT4OID:
        case INT8OID:
        case FLOAT4OID:
        case FLOAT8OID:
        case NUMERICOID:
            getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
            *tcategory = JSONTYPE_NUMERIC;
            break;

        case DATEOID:
            *tcategory = JSONTYPE_DATE;
            break;

        case TIMESTAMPOID:
            *tcategory = JSONTYPE_TIMESTAMP;
            break;

        case TIMESTAMPTZOID:
            *tcategory = JSONTYPE_TIMESTAMPTZ;
            break;

        case JSONOID:
        case JSONBOID:
            getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
            *tcategory = JSONTYPE_JSON;
            break;

        default:
            /* Check for arrays and composites */
            if (OidIsValid(get_element_type(typoid)) || typoid == ANYARRAYOID
                || typoid == RECORDARRAYOID)
                *tcategory = JSONTYPE_ARRAY;
            else if (type_is_rowtype(typoid))   /* includes RECORDOID */
                *tcategory = JSONTYPE_COMPOSITE;
            else
            {
                /* It's probably the general case ... */
                *tcategory = JSONTYPE_OTHER;
                /* but let's look for a cast to json, if it's not built-in */
                if (typoid >= FirstNormalObjectId)
                {
                    Oid         castfunc;
                    CoercionPathType ctype;

                    ctype = find_coercion_pathway(JSONOID, typoid,
                                                  COERCION_EXPLICIT,
                                                  &castfunc);
                    if (ctype == COERCION_PATH_FUNC && OidIsValid(castfunc))
                    {
                        *tcategory = JSONTYPE_CAST;
                        *outfuncoid = castfunc;
                    }
                    else
                    {
                        /* non builtin type with no cast */
                        getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
                    }
                }
                else
                {
                    /* any other builtin type */
                    getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
                }
            }
            break;
    }
}

json_count_array_elements()

int json_count_array_elements

(

JsonLexContext *

lex

)

Definition at line 367 of file json.c.

References JSON_PARSE_ARRAY_NEXT, JSON_PARSE_ARRAY_START, JSON_TOKEN_ARRAY_END, JSON_TOKEN_ARRAY_START, JSON_TOKEN_COMMA, lex_accept(), lex_expect(), JsonLexContext::lex_level, lex_peek(), parse_array_element(), and JsonLexContext::strval.

Referenced by get_array_start().

{
    JsonLexContext copylex;
    int         count;

    /*
     * It's safe to do this with a shallow copy because the lexical routines
     * don't scribble on the input. They do scribble on the other pointers
     * etc, so doing this with a copy makes that safe.
     */
    memcpy(&copylex, lex, sizeof(JsonLexContext));
    copylex.strval = NULL;      /* not interested in values here */
    copylex.lex_level++;

    count = 0;
    lex_expect(JSON_PARSE_ARRAY_START, &copylex, JSON_TOKEN_ARRAY_START);
    if (lex_peek(&copylex) != JSON_TOKEN_ARRAY_END)
    {
        do
        {
            count++;
            parse_array_element(&copylex, &nullSemAction);
        }
        while (lex_accept(&copylex, JSON_TOKEN_COMMA, NULL));
    }
    lex_expect(JSON_PARSE_ARRAY_NEXT, &copylex, JSON_TOKEN_ARRAY_END);

    return count;
}

json_in()

Datum json_in

(

PG_FUNCTION_ARGS

)

Definition at line 228 of file json.c.

References cstring_to_text(), makeJsonLexContext(), PG_GETARG_CSTRING, pg_parse_json(), and PG_RETURN_TEXT_P.

{
    char       *json = PG_GETARG_CSTRING(0);
    text       *result = cstring_to_text(json);
    JsonLexContext *lex;

    /* validate it */
    lex = makeJsonLexContext(result, false);
    pg_parse_json(lex, &nullSemAction);

    /* Internal representation is the same as text, for now */
    PG_RETURN_TEXT_P(result);
}

json_lex()

static void json_lex ( JsonLexContext *  lex )

inlinestatic

Definition at line 614 of file json.c.

References JsonLexContext::input, JsonLexContext::input_length, JSON_ALPHANUMERIC_CHAR, json_lex_number(), json_lex_string(), JSON_TOKEN_ARRAY_END, JSON_TOKEN_ARRAY_START, JSON_TOKEN_COLON, JSON_TOKEN_COMMA, JSON_TOKEN_END, JSON_TOKEN_FALSE, JSON_TOKEN_NULL, JSON_TOKEN_NUMBER, JSON_TOKEN_OBJECT_END, JSON_TOKEN_OBJECT_START, JSON_TOKEN_STRING, JSON_TOKEN_TRUE, JsonLexContext::line_number, JsonLexContext::prev_token_terminator, report_invalid_token(), JsonLexContext::token_start, JsonLexContext::token_terminator, and JsonLexContext::token_type.

Referenced by json_typeof(), lex_accept(), and pg_parse_json().

{
    char       *s;
    int         len;

    /* Skip leading whitespace. */
    s = lex->token_terminator;
    len = s - lex->input;
    while (len < lex->input_length &&
           (*s == ' ' || *s == '\t' || *s == '\n' || *s == '\r'))
    {
        if (*s == '\n')
            ++lex->line_number;
        ++s;
        ++len;
    }
    lex->token_start = s;

    /* Determine token type. */
    if (len >= lex->input_length)
    {
        lex->token_start = NULL;
        lex->prev_token_terminator = lex->token_terminator;
        lex->token_terminator = s;
        lex->token_type = JSON_TOKEN_END;
    }
    else
        switch (*s)
        {
                /* Single-character token, some kind of punctuation mark. */
            case '{':
                lex->prev_token_terminator = lex->token_terminator;
                lex->token_terminator = s + 1;
                lex->token_type = JSON_TOKEN_OBJECT_START;
                break;
            case '}':
                lex->prev_token_terminator = lex->token_terminator;
                lex->token_terminator = s + 1;
                lex->token_type = JSON_TOKEN_OBJECT_END;
                break;
            case '[':
                lex->prev_token_terminator = lex->token_terminator;
                lex->token_terminator = s + 1;
                lex->token_type = JSON_TOKEN_ARRAY_START;
                break;
            case ']':
                lex->prev_token_terminator = lex->token_terminator;
                lex->token_terminator = s + 1;
                lex->token_type = JSON_TOKEN_ARRAY_END;
                break;
            case ',':
                lex->prev_token_terminator = lex->token_terminator;
                lex->token_terminator = s + 1;
                lex->token_type = JSON_TOKEN_COMMA;
                break;
            case ':':
                lex->prev_token_terminator = lex->token_terminator;
                lex->token_terminator = s + 1;
                lex->token_type = JSON_TOKEN_COLON;
                break;
            case '"':
                /* string */
                json_lex_string(lex);
                lex->token_type = JSON_TOKEN_STRING;
                break;
            case '-':
                /* Negative number. */
                json_lex_number(lex, s + 1, NULL, NULL);
                lex->token_type = JSON_TOKEN_NUMBER;
                break;
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
                /* Positive number. */
                json_lex_number(lex, s, NULL, NULL);
                lex->token_type = JSON_TOKEN_NUMBER;
                break;
            default:
                {
                    char       *p;

                    /*
                     * We're not dealing with a string, number, legal
                     * punctuation mark, or end of string.  The only legal
                     * tokens we might find here are true, false, and null,
                     * but for error reporting purposes we scan until we see a
                     * non-alphanumeric character.  That way, we can report
                     * the whole word as an unexpected token, rather than just
                     * some unintuitive prefix thereof.
                     */
                    for (p = s; p - s < lex->input_length - len && JSON_ALPHANUMERIC_CHAR(*p); p++)
                         /* skip */ ;

                    /*
                     * We got some sort of unexpected punctuation or an
                     * otherwise unexpected character, so just complain about
                     * that one character.
                     */
                    if (p == s)
                    {
                        lex->prev_token_terminator = lex->token_terminator;
                        lex->token_terminator = s + 1;
                        report_invalid_token(lex);
                    }

                    /*
                     * We've got a real alphanumeric token here.  If it
                     * happens to be true, false, or null, all is well.  If
                     * not, error out.
                     */
                    lex->prev_token_terminator = lex->token_terminator;
                    lex->token_terminator = p;
                    if (p - s == 4)
                    {
                        if (memcmp(s, "true", 4) == 0)
                            lex->token_type = JSON_TOKEN_TRUE;
                        else if (memcmp(s, "null", 4) == 0)
                            lex->token_type = JSON_TOKEN_NULL;
                        else
                            report_invalid_token(lex);
                    }
                    else if (p - s == 5 && memcmp(s, "false", 5) == 0)
                        lex->token_type = JSON_TOKEN_FALSE;
                    else
                        report_invalid_token(lex);

                }
        }                       /* end of switch */
}

json_lex_number()

static void json_lex_number ( JsonLexContext *  lex, char *  s, bool *  num_err, int *  total_len  )

inlinestatic

Definition at line 1028 of file json.c.

References error(), JsonLexContext::input, JsonLexContext::input_length, JSON_ALPHANUMERIC_CHAR, JsonLexContext::prev_token_terminator, report_invalid_token(), and JsonLexContext::token_terminator.

Referenced by IsValidJsonNumber(), and json_lex().

{
    bool        error = false;
    int         len = s - lex->input;

    /* Part (1): leading sign indicator. */
    /* Caller already did this for us; so do nothing. */

    /* Part (2): parse main digit string. */
    if (len < lex->input_length && *s == '0')
    {
        s++;
        len++;
    }
    else if (len < lex->input_length && *s >= '1' && *s <= '9')
    {
        do
        {
            s++;
            len++;
        } while (len < lex->input_length && *s >= '0' && *s <= '9');
    }
    else
        error = true;

    /* Part (3): parse optional decimal portion. */
    if (len < lex->input_length && *s == '.')
    {
        s++;
        len++;
        if (len == lex->input_length || *s < '0' || *s > '9')
            error = true;
        else
        {
            do
            {
                s++;
                len++;
            } while (len < lex->input_length && *s >= '0' && *s <= '9');
        }
    }

    /* Part (4): parse optional exponent. */
    if (len < lex->input_length && (*s == 'e' || *s == 'E'))
    {
        s++;
        len++;
        if (len < lex->input_length && (*s == '+' || *s == '-'))
        {
            s++;
            len++;
        }
        if (len == lex->input_length || *s < '0' || *s > '9')
            error = true;
        else
        {
            do
            {
                s++;
                len++;
            } while (len < lex->input_length && *s >= '0' && *s <= '9');
        }
    }

    /*
     * Check for trailing garbage.  As in json_lex(), any alphanumeric stuff
     * here should be considered part of the token for error-reporting
     * purposes.
     */
    for (; len < lex->input_length && JSON_ALPHANUMERIC_CHAR(*s); s++, len++)
        error = true;

    if (total_len != NULL)
        *total_len = len;

    if (num_err != NULL)
    {
        /* let the caller handle any error */
        *num_err = error;
    }
    else
    {
        /* return token endpoint */
        lex->prev_token_terminator = lex->token_terminator;
        lex->token_terminator = s;
        /* handle error if any */
        if (error)
            report_invalid_token(lex);
    }
}

json_lex_string()

static void json_lex_string ( JsonLexContext *  lex )

inlinestatic

Definition at line 755 of file json.c.

References appendBinaryStringInfo(), appendStringInfoChar(), Assert, ereport, errcode(), errdetail(), errmsg(), ERROR, extract_mb_char(), GetDatabaseEncoding(), i, JsonLexContext::input, JsonLexContext::input_length, pg_mblen(), PG_UTF8, pg_utf_mblen(), JsonLexContext::prev_token_terminator, report_invalid_token(), report_json_context(), resetStringInfo(), JsonLexContext::strval, JsonLexContext::token_start, JsonLexContext::token_terminator, and unicode_to_utf8().

Referenced by json_lex().

{
    char       *s;
    int         len;
    int         hi_surrogate = -1;

    if (lex->strval != NULL)
        resetStringInfo(lex->strval);

    Assert(lex->input_length > 0);
    s = lex->token_start;
    len = lex->token_start - lex->input;
    for (;;)
    {
        s++;
        len++;
        /* Premature end of the string. */
        if (len >= lex->input_length)
        {
            lex->token_terminator = s;
            report_invalid_token(lex);
        }
        else if (*s == '"')
            break;
        else if ((unsigned char) *s < 32)
        {
            /* Per RFC4627, these characters MUST be escaped. */
            /* Since *s isn't printable, exclude it from the context string */
            lex->token_terminator = s;
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                     errmsg("invalid input syntax for type %s", "json"),
                     errdetail("Character with value 0x%02x must be escaped.",
                               (unsigned char) *s),
                     report_json_context(lex)));
        }
        else if (*s == '\\')
        {
            /* OK, we have an escape character. */
            s++;
            len++;
            if (len >= lex->input_length)
            {
                lex->token_terminator = s;
                report_invalid_token(lex);
            }
            else if (*s == 'u')
            {
                int         i;
                int         ch = 0;

                for (i = 1; i <= 4; i++)
                {
                    s++;
                    len++;
                    if (len >= lex->input_length)
                    {
                        lex->token_terminator = s;
                        report_invalid_token(lex);
                    }
                    else if (*s >= '0' && *s <= '9')
                        ch = (ch * 16) + (*s - '0');
                    else if (*s >= 'a' && *s <= 'f')
                        ch = (ch * 16) + (*s - 'a') + 10;
                    else if (*s >= 'A' && *s <= 'F')
                        ch = (ch * 16) + (*s - 'A') + 10;
                    else
                    {
                        lex->token_terminator = s + pg_mblen(s);
                        ereport(ERROR,
                                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                                 errmsg("invalid input syntax for type %s",
                                        "json"),
                                 errdetail("\"\\u\" must be followed by four hexadecimal digits."),
                                 report_json_context(lex)));
                    }
                }
                if (lex->strval != NULL)
                {
                    char        utf8str[5];
                    int         utf8len;

                    if (ch >= 0xd800 && ch <= 0xdbff)
                    {
                        if (hi_surrogate != -1)
                            ereport(ERROR,
                                    (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                                     errmsg("invalid input syntax for type %s",
                                            "json"),
                                     errdetail("Unicode high surrogate must not follow a high surrogate."),
                                     report_json_context(lex)));
                        hi_surrogate = (ch & 0x3ff) << 10;
                        continue;
                    }
                    else if (ch >= 0xdc00 && ch <= 0xdfff)
                    {
                        if (hi_surrogate == -1)
                            ereport(ERROR,
                                    (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                                     errmsg("invalid input syntax for type %s", "json"),
                                     errdetail("Unicode low surrogate must follow a high surrogate."),
                                     report_json_context(lex)));
                        ch = 0x10000 + hi_surrogate + (ch & 0x3ff);
                        hi_surrogate = -1;
                    }

                    if (hi_surrogate != -1)
                        ereport(ERROR,
                                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                                 errmsg("invalid input syntax for type %s", "json"),
                                 errdetail("Unicode low surrogate must follow a high surrogate."),
                                 report_json_context(lex)));

                    /*
                     * For UTF8, replace the escape sequence by the actual
                     * utf8 character in lex->strval. Do this also for other
                     * encodings if the escape designates an ASCII character,
                     * otherwise raise an error.
                     */

                    if (ch == 0)
                    {
                        /* We can't allow this, since our TEXT type doesn't */
                        ereport(ERROR,
                                (errcode(ERRCODE_UNTRANSLATABLE_CHARACTER),
                                 errmsg("unsupported Unicode escape sequence"),
                                 errdetail("\\u0000 cannot be converted to text."),
                                 report_json_context(lex)));
                    }
                    else if (GetDatabaseEncoding() == PG_UTF8)
                    {
                        unicode_to_utf8(ch, (unsigned char *) utf8str);
                        utf8len = pg_utf_mblen((unsigned char *) utf8str);
                        appendBinaryStringInfo(lex->strval, utf8str, utf8len);
                    }
                    else if (ch <= 0x007f)
                    {
                        /*
                         * This is the only way to designate things like a
                         * form feed character in JSON, so it's useful in all
                         * encodings.
                         */
                        appendStringInfoChar(lex->strval, (char) ch);
                    }
                    else
                    {
                        ereport(ERROR,
                                (errcode(ERRCODE_UNTRANSLATABLE_CHARACTER),
                                 errmsg("unsupported Unicode escape sequence"),
                                 errdetail("Unicode escape values cannot be used for code point values above 007F when the server encoding is not UTF8."),
                                 report_json_context(lex)));
                    }

                }
            }
            else if (lex->strval != NULL)
            {
                if (hi_surrogate != -1)
                    ereport(ERROR,
                            (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                             errmsg("invalid input syntax for type %s",
                                    "json"),
                             errdetail("Unicode low surrogate must follow a high surrogate."),
                             report_json_context(lex)));

                switch (*s)
                {
                    case '"':
                    case '\\':
                    case '/':
                        appendStringInfoChar(lex->strval, *s);
                        break;
                    case 'b':
                        appendStringInfoChar(lex->strval, '\b');
                        break;
                    case 'f':
                        appendStringInfoChar(lex->strval, '\f');
                        break;
                    case 'n':
                        appendStringInfoChar(lex->strval, '\n');
                        break;
                    case 'r':
                        appendStringInfoChar(lex->strval, '\r');
                        break;
                    case 't':
                        appendStringInfoChar(lex->strval, '\t');
                        break;
                    default:
                        /* Not a valid string escape, so error out. */
                        lex->token_terminator = s + pg_mblen(s);
                        ereport(ERROR,
                                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                                 errmsg("invalid input syntax for type %s",
                                        "json"),
                                 errdetail("Escape sequence \"\\%s\" is invalid.",
                                           extract_mb_char(s)),
                                 report_json_context(lex)));
                }
            }
            else if (strchr("\"\\/bfnrt", *s) == NULL)
            {
                /*
                 * Simpler processing if we're not bothered about de-escaping
                 *
                 * It's very tempting to remove the strchr() call here and
                 * replace it with a switch statement, but testing so far has
                 * shown it's not a performance win.
                 */
                lex->token_terminator = s + pg_mblen(s);
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Escape sequence \"\\%s\" is invalid.",
                                   extract_mb_char(s)),
                         report_json_context(lex)));
            }

        }
        else if (lex->strval != NULL)
        {
            if (hi_surrogate != -1)
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Unicode low surrogate must follow a high surrogate."),
                         report_json_context(lex)));

            appendStringInfoChar(lex->strval, *s);
        }

    }

    if (hi_surrogate != -1)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                 errmsg("invalid input syntax for type %s", "json"),
                 errdetail("Unicode low surrogate must follow a high surrogate."),
                 report_json_context(lex)));

    /* Hooray, we found the end of the string! */
    lex->prev_token_terminator = lex->token_terminator;
    lex->token_terminator = s + 1;
}

json_object()

Datum json_object

(

PG_FUNCTION_ARGS

)

Definition at line 2287 of file json.c.

References appendStringInfoChar(), appendStringInfoString(), ARR_DIMS, ARR_NDIM, cstring_to_text_with_len(), CStringGetTextDatum, StringInfoData::data, deconstruct_array(), ereport, errcode(), errmsg(), ERROR, escape_json(), i, initStringInfo(), StringInfoData::len, pfree(), PG_GETARG_ARRAYTYPE_P, PG_RETURN_DATUM, PG_RETURN_TEXT_P, and TextDatumGetCString.

{
    ArrayType  *in_array = PG_GETARG_ARRAYTYPE_P(0);
    int         ndims = ARR_NDIM(in_array);
    StringInfoData result;
    Datum      *in_datums;
    bool       *in_nulls;
    int         in_count,
                count,
                i;
    text       *rval;
    char       *v;

    switch (ndims)
    {
        case 0:
            PG_RETURN_DATUM(CStringGetTextDatum("{}"));
            break;

        case 1:
            if ((ARR_DIMS(in_array)[0]) % 2)
                ereport(ERROR,
                        (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
                         errmsg("array must have even number of elements")));
            break;

        case 2:
            if ((ARR_DIMS(in_array)[1]) != 2)
                ereport(ERROR,
                        (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
                         errmsg("array must have two columns")));
            break;

        default:
            ereport(ERROR,
                    (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
                     errmsg("wrong number of array subscripts")));
    }

    deconstruct_array(in_array,
                      TEXTOID, -1, false, 'i',
                      &in_datums, &in_nulls, &in_count);

    count = in_count / 2;

    initStringInfo(&result);

    appendStringInfoChar(&result, '{');

    for (i = 0; i < count; ++i)
    {
        if (in_nulls[i * 2])
            ereport(ERROR,
                    (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
                     errmsg("null value not allowed for object key")));

        v = TextDatumGetCString(in_datums[i * 2]);
        if (i > 0)
            appendStringInfoString(&result, ", ");
        escape_json(&result, v);
        appendStringInfoString(&result, " : ");
        pfree(v);
        if (in_nulls[i * 2 + 1])
            appendStringInfoString(&result, "null");
        else
        {
            v = TextDatumGetCString(in_datums[i * 2 + 1]);
            escape_json(&result, v);
            pfree(v);
        }
    }

    appendStringInfoChar(&result, '}');

    pfree(in_datums);
    pfree(in_nulls);

    rval = cstring_to_text_with_len(result.data, result.len);
    pfree(result.data);

    PG_RETURN_TEXT_P(rval);

}

json_object_agg_finalfn()

Datum json_object_agg_finalfn

(

PG_FUNCTION_ARGS

)

Definition at line 2134 of file json.c.

References AggCheckCallContext(), Assert, catenate_stringinfo_string(), PG_ARGISNULL, PG_GETARG_POINTER, PG_RETURN_NULL, PG_RETURN_TEXT_P, and JsonAggState::str.

{
    JsonAggState *state;

    /* cannot be called directly because of internal-type argument */
    Assert(AggCheckCallContext(fcinfo, NULL));

    state = PG_ARGISNULL(0) ? NULL : (JsonAggState *) PG_GETARG_POINTER(0);

    /* NULL result for no rows in, as is standard with aggregates */
    if (state == NULL)
        PG_RETURN_NULL();

    /* Else return state with appropriate object terminator added */
    PG_RETURN_TEXT_P(catenate_stringinfo_string(state->str, " }"));
}

json_object_agg_transfn()

Datum json_object_agg_transfn

(

PG_FUNCTION_ARGS

)

Definition at line 2043 of file json.c.

References AggCheckCallContext(), appendStringInfoString(), arg, datum_to_json(), elog, ereport, errcode(), errmsg(), ERROR, get_fn_expr_argtype(), InvalidOid, json_categorize_type(), JsonAggState::key_category, JsonAggState::key_output_func, makeStringInfo(), MemoryContextSwitchTo(), palloc(), PG_ARGISNULL, PG_GETARG_DATUM, PG_GETARG_POINTER, PG_RETURN_POINTER, JsonAggState::str, JsonAggState::val_category, and JsonAggState::val_output_func.

{
    MemoryContext aggcontext,
                oldcontext;
    JsonAggState *state;
    Datum       arg;

    if (!AggCheckCallContext(fcinfo, &aggcontext))
    {
        /* cannot be called directly because of internal-type argument */
        elog(ERROR, "json_object_agg_transfn called in non-aggregate context");
    }

    if (PG_ARGISNULL(0))
    {
        Oid         arg_type;

        /*
         * Make the StringInfo in a context where it will persist for the
         * duration of the aggregate call. Switching context is only needed
         * for this initial step, as the StringInfo routines make sure they
         * use the right context to enlarge the object if necessary.
         */
        oldcontext = MemoryContextSwitchTo(aggcontext);
        state = (JsonAggState *) palloc(sizeof(JsonAggState));
        state->str = makeStringInfo();
        MemoryContextSwitchTo(oldcontext);

        arg_type = get_fn_expr_argtype(fcinfo->flinfo, 1);

        if (arg_type == InvalidOid)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                     errmsg("could not determine data type for argument %d", 1)));

        json_categorize_type(arg_type, &state->key_category,
                             &state->key_output_func);

        arg_type = get_fn_expr_argtype(fcinfo->flinfo, 2);

        if (arg_type == InvalidOid)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                     errmsg("could not determine data type for argument %d", 2)));

        json_categorize_type(arg_type, &state->val_category,
                             &state->val_output_func);

        appendStringInfoString(state->str, "{ ");
    }
    else
    {
        state = (JsonAggState *) PG_GETARG_POINTER(0);
        appendStringInfoString(state->str, ", ");
    }

    /*
     * Note: since json_object_agg() is declared as taking type "any", the
     * parser will not do any type conversion on unknown-type literals (that
     * is, undecorated strings or NULLs).  Such values will arrive here as
     * type UNKNOWN, which fortunately does not matter to us, since
     * unknownout() works fine.
     */

    if (PG_ARGISNULL(1))
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("field name must not be null")));

    arg = PG_GETARG_DATUM(1);

    datum_to_json(arg, false, state->str, state->key_category,
                  state->key_output_func, true);

    appendStringInfoString(state->str, " : ");

    if (PG_ARGISNULL(2))
        arg = (Datum) 0;
    else
        arg = PG_GETARG_DATUM(2);

    datum_to_json(arg, PG_ARGISNULL(2), state->str, state->val_category,
                  state->val_output_func, false);

    PG_RETURN_POINTER(state);
}

json_object_two_arg()

Datum json_object_two_arg

(

PG_FUNCTION_ARGS

)

Definition at line 2378 of file json.c.

References appendStringInfoChar(), appendStringInfoString(), ARR_NDIM, cstring_to_text_with_len(), CStringGetTextDatum, StringInfoData::data, deconstruct_array(), ereport, errcode(), errmsg(), ERROR, escape_json(), i, initStringInfo(), StringInfoData::len, pfree(), PG_GETARG_ARRAYTYPE_P, PG_RETURN_DATUM, PG_RETURN_TEXT_P, and TextDatumGetCString.

{
    ArrayType  *key_array = PG_GETARG_ARRAYTYPE_P(0);
    ArrayType  *val_array = PG_GETARG_ARRAYTYPE_P(1);
    int         nkdims = ARR_NDIM(key_array);
    int         nvdims = ARR_NDIM(val_array);
    StringInfoData result;
    Datum      *key_datums,
               *val_datums;
    bool       *key_nulls,
               *val_nulls;
    int         key_count,
                val_count,
                i;
    text       *rval;
    char       *v;

    if (nkdims > 1 || nkdims != nvdims)
        ereport(ERROR,
                (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
                 errmsg("wrong number of array subscripts")));

    if (nkdims == 0)
        PG_RETURN_DATUM(CStringGetTextDatum("{}"));

    deconstruct_array(key_array,
                      TEXTOID, -1, false, 'i',
                      &key_datums, &key_nulls, &key_count);

    deconstruct_array(val_array,
                      TEXTOID, -1, false, 'i',
                      &val_datums, &val_nulls, &val_count);

    if (key_count != val_count)
        ereport(ERROR,
                (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
                 errmsg("mismatched array dimensions")));

    initStringInfo(&result);

    appendStringInfoChar(&result, '{');

    for (i = 0; i < key_count; ++i)
    {
        if (key_nulls[i])
            ereport(ERROR,
                    (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
                     errmsg("null value not allowed for object key")));

        v = TextDatumGetCString(key_datums[i]);
        if (i > 0)
            appendStringInfoString(&result, ", ");
        escape_json(&result, v);
        appendStringInfoString(&result, " : ");
        pfree(v);
        if (val_nulls[i])
            appendStringInfoString(&result, "null");
        else
        {
            v = TextDatumGetCString(val_datums[i]);
            escape_json(&result, v);
            pfree(v);
        }
    }

    appendStringInfoChar(&result, '}');

    pfree(key_datums);
    pfree(key_nulls);
    pfree(val_datums);
    pfree(val_nulls);

    rval = cstring_to_text_with_len(result.data, result.len);
    pfree(result.data);

    PG_RETURN_TEXT_P(rval);
}

json_out()

Datum json_out

(

PG_FUNCTION_ARGS

)

Definition at line 246 of file json.c.

References PG_GETARG_DATUM, PG_RETURN_CSTRING, and TextDatumGetCString.

{
    /* we needn't detoast because text_to_cstring will handle that */
    Datum       txt = PG_GETARG_DATUM(0);

    PG_RETURN_CSTRING(TextDatumGetCString(txt));
}

json_recv()

Datum json_recv

(

PG_FUNCTION_ARGS

)

Definition at line 272 of file json.c.

References buf, cstring_to_text_with_len(), StringInfoData::cursor, StringInfoData::len, makeJsonLexContextCstringLen(), PG_GETARG_POINTER, pg_parse_json(), PG_RETURN_TEXT_P, pq_getmsgtext(), and JsonAggState::str.

{
    StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);
    char       *str;
    int         nbytes;
    JsonLexContext *lex;

    str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);

    /* Validate it. */
    lex = makeJsonLexContextCstringLen(str, nbytes, false);
    pg_parse_json(lex, &nullSemAction);

    PG_RETURN_TEXT_P(cstring_to_text_with_len(str, nbytes));
}

json_send()

Datum json_send

(

PG_FUNCTION_ARGS

)

Definition at line 258 of file json.c.

References buf, PG_GETARG_TEXT_PP, PG_RETURN_BYTEA_P, pq_begintypsend(), pq_endtypsend(), pq_sendtext(), VARDATA_ANY, and VARSIZE_ANY_EXHDR.

{
    text       *t = PG_GETARG_TEXT_PP(0);
    StringInfoData buf;

    pq_begintypsend(&buf);
    pq_sendtext(&buf, VARDATA_ANY(t), VARSIZE_ANY_EXHDR(t));
    PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

json_typeof()

Datum json_typeof

(

PG_FUNCTION_ARGS

)

Definition at line 2515 of file json.c.

References cstring_to_text(), elog, ERROR, json_lex(), JSON_TOKEN_ARRAY_START, JSON_TOKEN_FALSE, JSON_TOKEN_NULL, JSON_TOKEN_NUMBER, JSON_TOKEN_OBJECT_START, JSON_TOKEN_STRING, JSON_TOKEN_TRUE, lex_peek(), makeJsonLexContext(), PG_GETARG_TEXT_PP, PG_RETURN_TEXT_P, and generate_unaccent_rules::type.

{
    text       *json;

    JsonLexContext *lex;
    JsonTokenType tok;
    char       *type;

    json = PG_GETARG_TEXT_PP(0);
    lex = makeJsonLexContext(json, false);

    /* Lex exactly one token from the input and check its type. */
    json_lex(lex);
    tok = lex_peek(lex);
    switch (tok)
    {
        case JSON_TOKEN_OBJECT_START:
            type = "object";
            break;
        case JSON_TOKEN_ARRAY_START:
            type = "array";
            break;
        case JSON_TOKEN_STRING:
            type = "string";
            break;
        case JSON_TOKEN_NUMBER:
            type = "number";
            break;
        case JSON_TOKEN_TRUE:
        case JSON_TOKEN_FALSE:
            type = "boolean";
            break;
        case JSON_TOKEN_NULL:
            type = "null";
            break;
        default:
            elog(ERROR, "unexpected json token: %d", tok);
    }

    PG_RETURN_TEXT_P(cstring_to_text(type));
}

JsonEncodeDateTime()

char* JsonEncodeDateTime	(	char *	buf,
		Datum	value,
		Oid	typid
	)

Definition at line 1556 of file json.c.

References buf, DATE_NOT_FINITE, DatumGetDateADT, DatumGetTimeADT, DatumGetTimestamp, DatumGetTimestampTz, DatumGetTimeTzADTP, elog, EncodeDateOnly(), EncodeDateTime(), EncodeSpecialDate(), EncodeSpecialTimestamp(), EncodeTimeOnly(), ereport, errcode(), errmsg(), ERROR, j2date(), MAXDATELEN, palloc(), POSTGRES_EPOCH_JDATE, time2tm(), timestamp2tm(), TIMESTAMP_NOT_FINITE, timetz2tm(), tm, pg_tm::tm_mday, pg_tm::tm_mon, pg_tm::tm_year, and USE_XSD_DATES.

Referenced by datum_to_json(), and datum_to_jsonb().

{
    if (!buf)
        buf = palloc(MAXDATELEN + 1);

    switch (typid)
    {
        case DATEOID:
            {
                DateADT     date;
                struct pg_tm tm;

                date = DatumGetDateADT(value);

                /* Same as date_out(), but forcing DateStyle */
                if (DATE_NOT_FINITE(date))
                    EncodeSpecialDate(date, buf);
                else
                {
                    j2date(date + POSTGRES_EPOCH_JDATE,
                           &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
                    EncodeDateOnly(&tm, USE_XSD_DATES, buf);
                }
            }
            break;
        case TIMEOID:
            {
                TimeADT     time = DatumGetTimeADT(value);
                struct pg_tm tt,
                           *tm = &tt;
                fsec_t      fsec;

                /* Same as time_out(), but forcing DateStyle */
                time2tm(time, tm, &fsec);
                EncodeTimeOnly(tm, fsec, false, 0, USE_XSD_DATES, buf);
            }
            break;
        case TIMETZOID:
            {
                TimeTzADT  *time = DatumGetTimeTzADTP(value);
                struct pg_tm tt,
                           *tm = &tt;
                fsec_t      fsec;
                int         tz;

                /* Same as timetz_out(), but forcing DateStyle */
                timetz2tm(time, tm, &fsec, &tz);
                EncodeTimeOnly(tm, fsec, true, tz, USE_XSD_DATES, buf);
            }
            break;
        case TIMESTAMPOID:
            {
                Timestamp   timestamp;
                struct pg_tm tm;
                fsec_t      fsec;

                timestamp = DatumGetTimestamp(value);
                /* Same as timestamp_out(), but forcing DateStyle */
                if (TIMESTAMP_NOT_FINITE(timestamp))
                    EncodeSpecialTimestamp(timestamp, buf);
                else if (timestamp2tm(timestamp, NULL, &tm, &fsec, NULL, NULL) == 0)
                    EncodeDateTime(&tm, fsec, false, 0, NULL, USE_XSD_DATES, buf);
                else
                    ereport(ERROR,
                            (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
                             errmsg("timestamp out of range")));
            }
            break;
        case TIMESTAMPTZOID:
            {
                TimestampTz timestamp;
                struct pg_tm tm;
                int         tz;
                fsec_t      fsec;
                const char *tzn = NULL;

                timestamp = DatumGetTimestampTz(value);
                /* Same as timestamptz_out(), but forcing DateStyle */
                if (TIMESTAMP_NOT_FINITE(timestamp))
                    EncodeSpecialTimestamp(timestamp, buf);
                else if (timestamp2tm(timestamp, &tz, &tm, &fsec, &tzn, NULL) == 0)
                    EncodeDateTime(&tm, fsec, true, tz, tzn, USE_XSD_DATES, buf);
                else
                    ereport(ERROR,
                            (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
                             errmsg("timestamp out of range")));
            }
            break;
        default:
            elog(ERROR, "unknown jsonb value datetime type oid %d", typid);
            return NULL;
    }

    return buf;
}

lex_accept()

static bool lex_accept ( JsonLexContext *  lex, JsonTokenType  token, char **  lexeme  )

inlinestatic

Definition at line 139 of file json.c.

References StringInfoData::data, json_lex(), JSON_TOKEN_STRING, palloc(), pstrdup(), JsonLexContext::strval, JsonLexContext::token_start, JsonLexContext::token_terminator, and JsonLexContext::token_type.

Referenced by json_count_array_elements(), lex_expect(), parse_array(), parse_object(), parse_object_field(), and parse_scalar().

{
    if (lex->token_type == token)
    {
        if (lexeme != NULL)
        {
            if (lex->token_type == JSON_TOKEN_STRING)
            {
                if (lex->strval != NULL)
                    *lexeme = pstrdup(lex->strval->data);
            }
            else
            {
                int         len = (lex->token_terminator - lex->token_start);
                char       *tokstr = palloc(len + 1);

                memcpy(tokstr, lex->token_start, len);
                tokstr[len] = '\0';
                *lexeme = tokstr;
            }
        }
        json_lex(lex);
        return true;
    }
    return false;
}

lex_expect()

static void lex_expect ( JsonParseContext  ctx, JsonLexContext *  lex, JsonTokenType  token  )

inlinestatic

Definition at line 173 of file json.c.

References lex_accept(), and report_parse_error().

Referenced by json_count_array_elements(), parse_array(), parse_object(), parse_object_field(), and pg_parse_json().

{
    if (!lex_accept(lex, token, NULL))
        report_parse_error(ctx, lex);
}

lex_peek()

static JsonTokenType lex_peek ( JsonLexContext *  lex )

inlinestatic

Definition at line 124 of file json.c.

References JsonLexContext::token_type.

Referenced by json_count_array_elements(), json_typeof(), parse_array(), parse_array_element(), parse_object(), parse_object_field(), parse_scalar(), and pg_parse_json().

{
    return lex->token_type;
}

makeJsonLexContext()

JsonLexContext* makeJsonLexContext	(	text *	json,
		bool	need_escapes
	)

Definition at line 301 of file json.c.

References makeJsonLexContextCstringLen(), VARDATA_ANY, and VARSIZE_ANY_EXHDR.

Referenced by datum_to_jsonb(), each_worker(), elements_worker(), get_worker(), iterate_json_values(), json_array_length(), json_in(), json_object_keys(), json_strip_nulls(), json_typeof(), populate_recordset_worker(), and transform_json_string_values().

{
    return makeJsonLexContextCstringLen(VARDATA_ANY(json),
                                        VARSIZE_ANY_EXHDR(json),
                                        need_escapes);
}

makeJsonLexContextCstringLen()

JsonLexContext* makeJsonLexContextCstringLen	(	char *	json,
		int	len,
		bool	need_escapes
	)

Definition at line 309 of file json.c.

References JsonLexContext::input, JsonLexContext::input_length, JsonLexContext::line_number, JsonLexContext::line_start, makeStringInfo(), palloc0(), JsonLexContext::strval, and JsonLexContext::token_terminator.

Referenced by get_json_object_as_hash(), json_recv(), jsonb_from_cstring(), makeJsonLexContext(), and populate_array_json().

{
    JsonLexContext *lex = palloc0(sizeof(JsonLexContext));

    lex->input = lex->token_terminator = lex->line_start = json;
    lex->line_number = 1;
    lex->input_length = len;
    if (need_escapes)
        lex->strval = makeStringInfo();
    return lex;
}

parse_array()

static void parse_array ( JsonLexContext *  lex, JsonSemAction *  sem  )

static

Definition at line 570 of file json.c.

References JsonSemAction::array_end, JsonSemAction::array_start, check_stack_depth(), JSON_PARSE_ARRAY_NEXT, JSON_PARSE_ARRAY_START, JSON_TOKEN_ARRAY_END, JSON_TOKEN_ARRAY_START, JSON_TOKEN_COMMA, lex_accept(), lex_expect(), JsonLexContext::lex_level, lex_peek(), parse_array_element(), and JsonSemAction::semstate.

Referenced by parse_array_element(), parse_object_field(), and pg_parse_json().

{
    /*
     * an array is a possibly empty sequence of array elements, separated by
     * commas and surrounded by square brackets.
     */
    json_struct_action astart = sem->array_start;
    json_struct_action aend = sem->array_end;

    check_stack_depth();

    if (astart != NULL)
        (*astart) (sem->semstate);

    /*
     * Data inside an array is at a higher nesting level than the array
     * itself. Note that we increment this after we call the semantic routine
     * for the array start and restore it before we call the routine for the
     * array end.
     */
    lex->lex_level++;

    lex_expect(JSON_PARSE_ARRAY_START, lex, JSON_TOKEN_ARRAY_START);
    if (lex_peek(lex) != JSON_TOKEN_ARRAY_END)
    {

        parse_array_element(lex, sem);

        while (lex_accept(lex, JSON_TOKEN_COMMA, NULL))
            parse_array_element(lex, sem);
    }

    lex_expect(JSON_PARSE_ARRAY_NEXT, lex, JSON_TOKEN_ARRAY_END);

    lex->lex_level--;

    if (aend != NULL)
        (*aend) (sem->semstate);
}

parse_array_element()

static void parse_array_element ( JsonLexContext *  lex, JsonSemAction *  sem  )

static

Definition at line 539 of file json.c.

References JsonSemAction::array_element_end, JsonSemAction::array_element_start, JSON_TOKEN_ARRAY_START, JSON_TOKEN_NULL, JSON_TOKEN_OBJECT_START, lex_peek(), parse_array(), parse_object(), parse_scalar(), and JsonSemAction::semstate.

Referenced by json_count_array_elements(), and parse_array().

{
    json_aelem_action astart = sem->array_element_start;
    json_aelem_action aend = sem->array_element_end;
    JsonTokenType tok = lex_peek(lex);

    bool        isnull;

    isnull = tok == JSON_TOKEN_NULL;

    if (astart != NULL)
        (*astart) (sem->semstate, isnull);

    /* an array element is any object, array or scalar */
    switch (tok)
    {
        case JSON_TOKEN_OBJECT_START:
            parse_object(lex, sem);
            break;
        case JSON_TOKEN_ARRAY_START:
            parse_array(lex, sem);
            break;
        default:
            parse_scalar(lex, sem);
    }

    if (aend != NULL)
        (*aend) (sem->semstate, isnull);
}

parse_object()

static void parse_object ( JsonLexContext *  lex, JsonSemAction *  sem  )

static

Definition at line 489 of file json.c.

References check_stack_depth(), JSON_PARSE_OBJECT_NEXT, JSON_PARSE_OBJECT_START, JSON_TOKEN_COMMA, JSON_TOKEN_OBJECT_END, JSON_TOKEN_OBJECT_START, JSON_TOKEN_STRING, lex_accept(), lex_expect(), JsonLexContext::lex_level, lex_peek(), JsonSemAction::object_end, JsonSemAction::object_start, parse_object_field(), report_parse_error(), and JsonSemAction::semstate.

Referenced by parse_array_element(), parse_object_field(), and pg_parse_json().

{
    /*
     * an object is a possibly empty sequence of object fields, separated by
     * commas and surrounded by curly braces.
     */
    json_struct_action ostart = sem->object_start;
    json_struct_action oend = sem->object_end;
    JsonTokenType tok;

    check_stack_depth();

    if (ostart != NULL)
        (*ostart) (sem->semstate);

    /*
     * Data inside an object is at a higher nesting level than the object
     * itself. Note that we increment this after we call the semantic routine
     * for the object start and restore it before we call the routine for the
     * object end.
     */
    lex->lex_level++;

    /* we know this will succeed, just clearing the token */
    lex_expect(JSON_PARSE_OBJECT_START, lex, JSON_TOKEN_OBJECT_START);

    tok = lex_peek(lex);
    switch (tok)
    {
        case JSON_TOKEN_STRING:
            parse_object_field(lex, sem);
            while (lex_accept(lex, JSON_TOKEN_COMMA, NULL))
                parse_object_field(lex, sem);
            break;
        case JSON_TOKEN_OBJECT_END:
            break;
        default:
            /* case of an invalid initial token inside the object */
            report_parse_error(JSON_PARSE_OBJECT_START, lex);
    }

    lex_expect(JSON_PARSE_OBJECT_NEXT, lex, JSON_TOKEN_OBJECT_END);

    lex->lex_level--;

    if (oend != NULL)
        (*oend) (sem->semstate);
}

parse_object_field()

static void parse_object_field ( JsonLexContext *  lex, JsonSemAction *  sem  )

static

Definition at line 443 of file json.c.

References JSON_PARSE_OBJECT_LABEL, JSON_PARSE_STRING, JSON_TOKEN_ARRAY_START, JSON_TOKEN_COLON, JSON_TOKEN_NULL, JSON_TOKEN_OBJECT_START, JSON_TOKEN_STRING, lex_accept(), lex_expect(), lex_peek(), JsonSemAction::object_field_end, JsonSemAction::object_field_start, parse_array(), parse_object(), parse_scalar(), report_parse_error(), and JsonSemAction::semstate.

Referenced by parse_object().

{
    /*
     * An object field is "fieldname" : value where value can be a scalar,
     * object or array.  Note: in user-facing docs and error messages, we
     * generally call a field name a "key".
     */

    char       *fname = NULL;   /* keep compiler quiet */
    json_ofield_action ostart = sem->object_field_start;
    json_ofield_action oend = sem->object_field_end;
    bool        isnull;
    char      **fnameaddr = NULL;
    JsonTokenType tok;

    if (ostart != NULL || oend != NULL)
        fnameaddr = &fname;

    if (!lex_accept(lex, JSON_TOKEN_STRING, fnameaddr))
        report_parse_error(JSON_PARSE_STRING, lex);

    lex_expect(JSON_PARSE_OBJECT_LABEL, lex, JSON_TOKEN_COLON);

    tok = lex_peek(lex);
    isnull = tok == JSON_TOKEN_NULL;

    if (ostart != NULL)
        (*ostart) (sem->semstate, fname, isnull);

    switch (tok)
    {
        case JSON_TOKEN_OBJECT_START:
            parse_object(lex, sem);
            break;
        case JSON_TOKEN_ARRAY_START:
            parse_array(lex, sem);
            break;
        default:
            parse_scalar(lex, sem);
    }

    if (oend != NULL)
        (*oend) (sem->semstate, fname, isnull);
}

parse_scalar()

static void parse_scalar ( JsonLexContext *  lex, JsonSemAction *  sem  )

inlinestatic

Definition at line 407 of file json.c.

References JSON_PARSE_VALUE, JSON_TOKEN_FALSE, JSON_TOKEN_NULL, JSON_TOKEN_NUMBER, JSON_TOKEN_STRING, JSON_TOKEN_TRUE, lex_accept(), lex_peek(), report_parse_error(), JsonSemAction::scalar, JsonSemAction::semstate, and val.

Referenced by parse_array_element(), parse_object_field(), and pg_parse_json().

{
    char       *val = NULL;
    json_scalar_action sfunc = sem->scalar;
    char      **valaddr;
    JsonTokenType tok = lex_peek(lex);

    valaddr = sfunc == NULL ? NULL : &val;

    /* a scalar must be a string, a number, true, false, or null */
    switch (tok)
    {
        case JSON_TOKEN_TRUE:
            lex_accept(lex, JSON_TOKEN_TRUE, valaddr);
            break;
        case JSON_TOKEN_FALSE:
            lex_accept(lex, JSON_TOKEN_FALSE, valaddr);
            break;
        case JSON_TOKEN_NULL:
            lex_accept(lex, JSON_TOKEN_NULL, valaddr);
            break;
        case JSON_TOKEN_NUMBER:
            lex_accept(lex, JSON_TOKEN_NUMBER, valaddr);
            break;
        case JSON_TOKEN_STRING:
            lex_accept(lex, JSON_TOKEN_STRING, valaddr);
            break;
        default:
            report_parse_error(JSON_PARSE_VALUE, lex);
    }

    if (sfunc != NULL)
        (*sfunc) (sem->semstate, val, tok);
}

pg_parse_json()

void pg_parse_json	(	JsonLexContext *	lex,
		JsonSemAction *	sem
	)

Definition at line 332 of file json.c.

References json_lex(), JSON_PARSE_END, JSON_TOKEN_ARRAY_START, JSON_TOKEN_END, JSON_TOKEN_OBJECT_START, lex_expect(), lex_peek(), parse_array(), parse_object(), and parse_scalar().

Referenced by datum_to_jsonb(), each_worker(), elements_worker(), get_json_object_as_hash(), get_worker(), iterate_json_values(), json_array_length(), json_in(), json_object_keys(), json_recv(), json_strip_nulls(), jsonb_from_cstring(), populate_array_json(), populate_recordset_worker(), and transform_json_string_values().

{
    JsonTokenType tok;

    /* get the initial token */
    json_lex(lex);

    tok = lex_peek(lex);

    /* parse by recursive descent */
    switch (tok)
    {
        case JSON_TOKEN_OBJECT_START:
            parse_object(lex, sem);
            break;
        case JSON_TOKEN_ARRAY_START:
            parse_array(lex, sem);
            break;
        default:
            parse_scalar(lex, sem); /* json can be a bare scalar */
    }

    lex_expect(JSON_PARSE_END, lex, JSON_TOKEN_END);

}

report_invalid_token()

static void report_invalid_token ( JsonLexContext *  lex )

static

Definition at line 1233 of file json.c.

References ereport, errcode(), errdetail(), errmsg(), ERROR, palloc(), report_json_context(), JsonLexContext::token_start, and JsonLexContext::token_terminator.

Referenced by json_lex(), json_lex_number(), and json_lex_string().

{
    char       *token;
    int         toklen;

    /* Separate out the offending token. */
    toklen = lex->token_terminator - lex->token_start;
    token = palloc(toklen + 1);
    memcpy(token, lex->token_start, toklen);
    token[toklen] = '\0';

    ereport(ERROR,
            (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
             errmsg("invalid input syntax for type %s", "json"),
             errdetail("Token \"%s\" is invalid.", token),
             report_json_context(lex)));
}

report_json_context()

static int report_json_context ( JsonLexContext *  lex )

static

Definition at line 1262 of file json.c.

References errcontext, JsonLexContext::input, JsonLexContext::input_length, IS_HIGHBIT_SET, JSON_TOKEN_END, palloc(), pg_mblen(), JsonLexContext::token_terminator, and JsonLexContext::token_type.

Referenced by json_lex_string(), report_invalid_token(), and report_parse_error().

{
    const char *context_start;
    const char *context_end;
    const char *line_start;
    int         line_number;
    char       *ctxt;
    int         ctxtlen;
    const char *prefix;
    const char *suffix;

    /* Choose boundaries for the part of the input we will display */
    context_start = lex->input;
    context_end = lex->token_terminator;
    line_start = context_start;
    line_number = 1;
    for (;;)
    {
        /* Always advance over newlines */
        if (context_start < context_end && *context_start == '\n')
        {
            context_start++;
            line_start = context_start;
            line_number++;
            continue;
        }
        /* Otherwise, done as soon as we are close enough to context_end */
        if (context_end - context_start < 50)
            break;
        /* Advance to next multibyte character */
        if (IS_HIGHBIT_SET(*context_start))
            context_start += pg_mblen(context_start);
        else
            context_start++;
    }

    /*
     * We add "..." to indicate that the excerpt doesn't start at the
     * beginning of the line ... but if we're within 3 characters of the
     * beginning of the line, we might as well just show the whole line.
     */
    if (context_start - line_start <= 3)
        context_start = line_start;

    /* Get a null-terminated copy of the data to present */
    ctxtlen = context_end - context_start;
    ctxt = palloc(ctxtlen + 1);
    memcpy(ctxt, context_start, ctxtlen);
    ctxt[ctxtlen] = '\0';

    /*
     * Show the context, prefixing "..." if not starting at start of line, and
     * suffixing "..." if not ending at end of line.
     */
    prefix = (context_start > line_start) ? "..." : "";
    suffix = (lex->token_type != JSON_TOKEN_END && context_end - lex->input < lex->input_length && *context_end != '\n' && *context_end != '\r') ? "..." : "";

    return errcontext("JSON data, line %d: %s%s%s",
                      line_number, prefix, ctxt, suffix);
}

report_parse_error()

static void report_parse_error ( JsonParseContext  ctx, JsonLexContext *  lex  )

static

Definition at line 1126 of file json.c.

References elog, ereport, errcode(), errdetail(), errmsg(), ERROR, JSON_PARSE_ARRAY_NEXT, JSON_PARSE_ARRAY_START, JSON_PARSE_END, JSON_PARSE_OBJECT_COMMA, JSON_PARSE_OBJECT_LABEL, JSON_PARSE_OBJECT_NEXT, JSON_PARSE_OBJECT_START, JSON_PARSE_STRING, JSON_PARSE_VALUE, JSON_TOKEN_END, palloc(), report_json_context(), JsonLexContext::token_start, JsonLexContext::token_terminator, and JsonLexContext::token_type.

Referenced by lex_expect(), parse_object(), parse_object_field(), and parse_scalar().

{
    char       *token;
    int         toklen;

    /* Handle case where the input ended prematurely. */
    if (lex->token_start == NULL || lex->token_type == JSON_TOKEN_END)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                 errmsg("invalid input syntax for type %s", "json"),
                 errdetail("The input string ended unexpectedly."),
                 report_json_context(lex)));

    /* Separate out the current token. */
    toklen = lex->token_terminator - lex->token_start;
    token = palloc(toklen + 1);
    memcpy(token, lex->token_start, toklen);
    token[toklen] = '\0';

    /* Complain, with the appropriate detail message. */
    if (ctx == JSON_PARSE_END)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                 errmsg("invalid input syntax for type %s", "json"),
                 errdetail("Expected end of input, but found \"%s\".",
                           token),
                 report_json_context(lex)));
    else
    {
        switch (ctx)
        {
            case JSON_PARSE_VALUE:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected JSON value, but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            case JSON_PARSE_STRING:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected string, but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            case JSON_PARSE_ARRAY_START:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected array element or \"]\", but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            case JSON_PARSE_ARRAY_NEXT:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected \",\" or \"]\", but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            case JSON_PARSE_OBJECT_START:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected string or \"}\", but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            case JSON_PARSE_OBJECT_LABEL:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected \":\", but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            case JSON_PARSE_OBJECT_NEXT:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected \",\" or \"}\", but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            case JSON_PARSE_OBJECT_COMMA:
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                         errmsg("invalid input syntax for type %s", "json"),
                         errdetail("Expected string, but found \"%s\".",
                                   token),
                         report_json_context(lex)));
                break;
            default:
                elog(ERROR, "unexpected json parse state: %d", ctx);
        }
    }
}

row_to_json()

Datum row_to_json

(

PG_FUNCTION_ARGS

)

Definition at line 1880 of file json.c.

References composite_to_json(), cstring_to_text_with_len(), StringInfoData::data, StringInfoData::len, makeStringInfo(), PG_GETARG_DATUM, and PG_RETURN_TEXT_P.

{
    Datum       array = PG_GETARG_DATUM(0);
    StringInfo  result;

    result = makeStringInfo();

    composite_to_json(array, result, false);

    PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}

row_to_json_pretty()

Datum row_to_json_pretty

(

PG_FUNCTION_ARGS

)

Definition at line 1896 of file json.c.

References composite_to_json(), cstring_to_text_with_len(), StringInfoData::data, StringInfoData::len, makeStringInfo(), PG_GETARG_BOOL, PG_GETARG_DATUM, and PG_RETURN_TEXT_P.

{
    Datum       array = PG_GETARG_DATUM(0);
    bool        use_line_feeds = PG_GETARG_BOOL(1);
    StringInfo  result;

    result = makeStringInfo();

    composite_to_json(array, result, use_line_feeds);

    PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}

to_json()

Datum to_json

(

PG_FUNCTION_ARGS

)

Definition at line 1913 of file json.c.

References cstring_to_text_with_len(), StringInfoData::data, datum_to_json(), ereport, errcode(), errmsg(), ERROR, get_fn_expr_argtype(), InvalidOid, json_categorize_type(), StringInfoData::len, makeStringInfo(), PG_GETARG_DATUM, PG_RETURN_TEXT_P, and val.

{
    Datum       val = PG_GETARG_DATUM(0);
    Oid         val_type = get_fn_expr_argtype(fcinfo->flinfo, 0);
    StringInfo  result;
    JsonTypeCategory tcategory;
    Oid         outfuncoid;

    if (val_type == InvalidOid)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("could not determine input data type")));

    json_categorize_type(val_type,
                         &tcategory, &outfuncoid);

    result = makeStringInfo();

    datum_to_json(val, false, result, tcategory, outfuncoid, false);

    PG_RETURN_TEXT_P(cstring_to_text_with_len(result->data, result->len));
}

Variable Documentation

nullSemAction

JsonSemAction nullSemAction

static

Initial value:

=
{
    NULL, NULL, NULL, NULL, NULL,
    NULL, NULL, NULL, NULL, NULL
}

Definition at line 110 of file json.c.