Function parse_scalar

src/common/jsonapi.c:272–314

* Recursive Descent parse routines. There is one for each structural * element in a json document: * - scalar (string, number, true, false, null) * - array ( [ ] ) * - array element * - object ( { } ) * - object field */

 *	  - object field
 */
static inline JsonParseErrorType
parse_scalar(JsonLexContext *lex, JsonSemAction *sem)
{
	char	   *val = NULL;
	json_scalar_action sfunc = sem->scalar;
	JsonTokenType tok = lex_peek(lex);
	JsonParseErrorType result;

	/* a scalar must be a string, a number, true, false, or null */
	if (tok != JSON_TOKEN_STRING && tok != JSON_TOKEN_NUMBER &&
		tok != JSON_TOKEN_TRUE && tok != JSON_TOKEN_FALSE &&
		tok != JSON_TOKEN_NULL)
		return report_parse_error(JSON_PARSE_VALUE, lex);

	/* if no semantic function, just consume the token */
	if (sfunc == NULL)
		return json_lex(lex);

	/* extract the de-escaped string value, or the raw lexeme */
	if (lex_peek(lex) == JSON_TOKEN_STRING)
	{
		if (lex->strval != NULL)
			val = pstrdup(lex->strval->data);
	}
	else
	{
		int			len = (lex->token_terminator - lex->token_start);

		val = palloc(len + 1);
		memcpy(val, lex->token_start, len);
		val[len] = '\0';
	}

	/* consume the token */
	result = json_lex(lex);
	if (result != JSON_SUCCESS)
		return result;

	/* invoke the callback */
	(*sfunc) (sem->semstate, val, tok);

	return JSON_SUCCESS;
}

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