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Fix hstore_to_json_loose's detection of valid JSON number values.

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We expose a function IsValidJsonNumber that internally calls the lexer
for json numbers. That allows us to use the same test everywhere,
instead of inventing a broken test for hstore conversions. The new
function is also used in datum_to_json, replacing the code that is now
moved to the new function.

Backpatch to 9.3 where hstore_to_json_loose was introduced.
This commit is contained in:
Andrew Dunstan
2014-12-01 11:28:45 -05:00
parent 4e86f1b16d
commit e09996ff8d
3 changed files with 46 additions and 61 deletions
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57
src/backend/utils/adt/json.c
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@ -173,6 +173,36 @@ lex_expect(JsonParseContext ctx, JsonLexContext *lex, JsonTokenType token)
(c) == '_' || \
IS_HIGHBIT_SET(c))
/* utility function to check if a string is a valid JSON number */
extern bool
IsValidJsonNumber(const char * str, int len)
{
bool numeric_error;
JsonLexContext dummy_lex;
/*
* 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);
return ! numeric_error;
}
/*
* Input.
*/
@ -1338,8 +1368,6 @@ datum_to_json(Datum val, bool is_null, StringInfo result,
{
char *outputstr;
text *jsontext;
bool numeric_error;
JsonLexContext dummy_lex;
/* callers are expected to ensure that null keys are not passed in */
Assert( ! (key_scalar && is_null));
@ -1376,25 +1404,14 @@ datum_to_json(Datum val, bool is_null, StringInfo result,
break;
case JSONTYPE_NUMERIC:
outputstr = OidOutputFunctionCall(outfuncoid, val);
if (key_scalar)
{
/* always quote keys */
escape_json(result, outputstr);
}
/*
* 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
{
/*
* Don't call escape_json for a non-key if it's a valid JSON
* number.
*/
dummy_lex.input = *outputstr == '-' ? outputstr + 1 : outputstr;
dummy_lex.input_length = strlen(dummy_lex.input);
json_lex_number(&dummy_lex, dummy_lex.input, &numeric_error);
if (!numeric_error)
appendStringInfoString(result, outputstr);
else
escape_json(result, outputstr);
}
escape_json(result, outputstr);
pfree(outputstr);
break;
case JSONTYPE_DATE: