json.c File Reference

#include "postgres.h"
#include "catalog/pg_type.h"
#include "funcapi.h"
#include "libpq/pqformat.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/json.h"
#include "utils/jsonfuncs.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"

Include dependency graph for json.c:

Go to the source code of this file.

Data Structures
struct	JsonAggState

Typedefs
typedef struct JsonAggState	JsonAggState

Enumerations
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	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)
Datum	json_in (PG_FUNCTION_ARGS)
Datum	json_out (PG_FUNCTION_ARGS)
Datum	json_send (PG_FUNCTION_ARGS)
Datum	json_recv (PG_FUNCTION_ARGS)
char *	JsonEncodeDateTime (char *buf, Datum value, Oid typid, const int *tzp)
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)

Typedef Documentation

JsonAggState

typedef struct JsonAggState JsonAggState

Enumeration Type Documentation

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 30 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 636 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 474 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 663 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 516 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(), and typalign.

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 679 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 973 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 563 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, TupleDescData::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 246 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, NULL);
                appendStringInfo(result, "\"%s\"", buf);
            }
            break;
        case JSONTYPE_TIMESTAMP:
            {
                char        buf[MAXDATELEN + 1];

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

                JsonEncodeDateTime(buf, val, TIMESTAMPTZOID, NULL);
                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 1279 of file json.c.

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

Referenced by AddFileToBackupManifest(), 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(), populate_scalar(), printJsonPathItem(), 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, '"');
}

json_agg_finalfn()

Datum json_agg_finalfn

(

PG_FUNCTION_ARGS

)

Definition at line 834 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 758 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 1057 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 1093 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 991 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_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 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"),
        /* translator: %s is a SQL function name */
                 errhint("The arguments of %s must consist of alternating keys and values.",
                         "json_build_object()")));

    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 1048 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 144 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 == ANYCOMPATIBLEARRAYOID || 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_in()

Datum json_in

(

PG_FUNCTION_ARGS

)

Definition at line 76 of file json.c.

References cstring_to_text(), makeJsonLexContext(), nullSemAction, PG_GETARG_CSTRING, pg_parse_json_or_ereport(), 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_or_ereport(lex, &nullSemAction);

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

json_object()

Datum json_object

(

PG_FUNCTION_ARGS

)

Definition at line 1105 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, TYPALIGN_INT,
                      &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 950 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 859 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 1196 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, TYPALIGN_INT,
                      &key_datums, &key_nulls, &key_count);

    deconstruct_array(val_array,
                      TEXTOID, -1, false, TYPALIGN_INT,
                      &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 94 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 120 of file json.c.

References buf, cstring_to_text_with_len(), StringInfoData::cursor, GetDatabaseEncoding(), StringInfoData::len, makeJsonLexContextCstringLen(), nullSemAction, PG_GETARG_POINTER, pg_parse_json_or_ereport(), 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, GetDatabaseEncoding(), false);
    pg_parse_json_or_ereport(lex, &nullSemAction);

    PG_RETURN_TEXT_P(cstring_to_text_with_len(str, nbytes));
}

json_send()

Datum json_send

(

PG_FUNCTION_ARGS

)

Definition at line 106 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 1333 of file json.c.

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

{
    text       *json;

    JsonLexContext *lex;
    JsonTokenType tok;
    char       *type;
    JsonParseErrorType result;

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

    /* Lex exactly one token from the input and check its type. */
    result = json_lex(lex);
    if (result != JSON_SUCCESS)
        json_ereport_error(result, lex);
    tok = lex->token_type;
    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,
		const int *	tzp
	)

Definition at line 353 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_isdst, pg_tm::tm_mday, pg_tm::tm_mon, pg_tm::tm_year, USE_XSD_DATES, and USECS_PER_SEC.

Referenced by convertJsonbScalar(), 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);

                /*
                 * If a time zone is specified, we apply the time-zone shift,
                 * convert timestamptz to pg_tm as if it were without a time
                 * zone, and then use the specified time zone for converting
                 * the timestamp into a string.
                 */
                if (tzp)
                {
                    tz = *tzp;
                    timestamp -= (TimestampTz) tz * USECS_PER_SEC;
                }

                /* Same as timestamptz_out(), but forcing DateStyle */
                if (TIMESTAMP_NOT_FINITE(timestamp))
                    EncodeSpecialTimestamp(timestamp, buf);
                else if (timestamp2tm(timestamp, tzp ? NULL : &tz, &tm, &fsec,
                                      tzp ? NULL : &tzn, NULL) == 0)
                {
                    if (tzp)
                        tm.tm_isdst = 1;    /* set time-zone presence flag */

                    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 %u", typid);
            return NULL;
    }

    return buf;
}

row_to_json()

Datum row_to_json

(

PG_FUNCTION_ARGS

)

Definition at line 696 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 712 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 729 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));
}