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jsonsl.c
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/* Copyright (C) 2012-2015 Mark Nunberg.
*
* See included LICENSE file for license details.
*/
#include "jsonsl.h"
#include <limits.h>
#include <ctype.h>
#ifdef JSONSL_USE_METRICS
#define XMETRICS \
X(STRINGY_INSIGNIFICANT) \
X(STRINGY_SLOWPATH) \
X(ALLOWED_WHITESPACE) \
X(QUOTE_FASTPATH) \
X(SPECIAL_FASTPATH) \
X(SPECIAL_WSPOP) \
X(SPECIAL_SLOWPATH) \
X(GENERIC) \
X(STRUCTURAL_TOKEN) \
X(SPECIAL_SWITCHFIRST) \
X(STRINGY_CATCH) \
X(NUMBER_FASTPATH) \
X(ESCAPES) \
X(TOTAL) \
struct jsonsl_metrics_st {
#define X(m) \
unsigned long metric_##m;
XMETRICS
#undef X
};
static struct jsonsl_metrics_st GlobalMetrics = { 0 };
static unsigned long GenericCounter[0x100] = { 0 };
static unsigned long StringyCatchCounter[0x100] = { 0 };
#define INCR_METRIC(m) \
GlobalMetrics.metric_##m++;
#define INCR_GENERIC(c) \
INCR_METRIC(GENERIC); \
GenericCounter[c]++; \
#define INCR_STRINGY_CATCH(c) \
INCR_METRIC(STRINGY_CATCH); \
StringyCatchCounter[c]++;
JSONSL_API
void jsonsl_dump_global_metrics(void)
{
int ii;
printf("JSONSL Metrics:\n");
#define X(m) \
printf("\t%-30s %20lu (%0.2f%%)\n", #m, GlobalMetrics.metric_##m, \
(float)((float)(GlobalMetrics.metric_##m/(float)GlobalMetrics.metric_TOTAL)) * 100);
XMETRICS
#undef X
printf("Generic Characters:\n");
for (ii = 0; ii < 0xff; ii++) {
if (GenericCounter[ii]) {
printf("\t[ %c ] %lu\n", ii, GenericCounter[ii]);
}
}
printf("Weird string loop\n");
for (ii = 0; ii < 0xff; ii++) {
if (StringyCatchCounter[ii]) {
printf("\t[ %c ] %lu\n", ii, StringyCatchCounter[ii]);
}
}
}
#else
#define INCR_METRIC(m)
#define INCR_GENERIC(c)
#define INCR_STRINGY_CATCH(c)
JSONSL_API
void jsonsl_dump_global_metrics(void) { }
#endif /* JSONSL_USE_METRICS */
#define CASE_DIGITS \
case '1': \
case '2': \
case '3': \
case '4': \
case '5': \
case '6': \
case '7': \
case '8': \
case '9': \
case '0':
static unsigned extract_special(unsigned);
static int is_special_end(unsigned);
static int is_allowed_whitespace(unsigned);
static int is_allowed_escape(unsigned);
static int is_simple_char(unsigned);
static char get_escape_equiv(unsigned);
JSONSL_API
jsonsl_t jsonsl_new(int nlevels)
{
unsigned int ii;
struct jsonsl_st * jsn;
if (nlevels < 2) {
return NULL;
}
jsn = (struct jsonsl_st *)
calloc(1, sizeof (*jsn) +
( (nlevels-1) * sizeof (struct jsonsl_state_st) )
);
jsn->levels_max = (unsigned int) nlevels;
jsn->max_callback_level = UINT_MAX;
jsonsl_reset(jsn);
for (ii = 0; ii < jsn->levels_max; ii++) {
jsn->stack[ii].level = ii;
}
return jsn;
}
JSONSL_API
void jsonsl_reset(jsonsl_t jsn)
{
jsn->tok_last = 0;
jsn->can_insert = 1;
jsn->pos = 0;
jsn->level = 0;
jsn->stopfl = 0;
jsn->in_escape = 0;
jsn->expecting = 0;
}
JSONSL_API
void jsonsl_destroy(jsonsl_t jsn)
{
if (jsn) {
free(jsn);
}
}
#define FASTPARSE_EXHAUSTED 1
#define FASTPARSE_BREAK 0
/*
* This function is meant to accelerate string parsing, reducing the main loop's
* check if we are indeed a string.
*
* @param jsn the parser
* @param[in,out] bytes_p A pointer to the current buffer (i.e. current position)
* @param[in,out] nbytes_p A pointer to the current size of the buffer
* @return true if all bytes have been exhausted (and thus the main loop can
* return), false if a special character was examined which requires greater
* examination.
*/
static int
jsonsl__str_fastparse(jsonsl_t jsn,
const jsonsl_uchar_t **bytes_p, size_t *nbytes_p)
{
const jsonsl_uchar_t *bytes = *bytes_p;
const jsonsl_uchar_t *end;
for (end = bytes + *nbytes_p; bytes != end; bytes++) {
if (
#ifdef JSONSL_USE_WCHAR
*bytes >= 0x100 ||
#endif /* JSONSL_USE_WCHAR */
(is_simple_char(*bytes))) {
INCR_METRIC(TOTAL);
INCR_METRIC(STRINGY_INSIGNIFICANT);
} else {
/* Once we're done here, re-calculate the position variables */
jsn->pos += (bytes - *bytes_p);
*nbytes_p -= (bytes - *bytes_p);
*bytes_p = bytes;
return FASTPARSE_BREAK;
}
}
/* Once we're done here, re-calculate the position variables */
jsn->pos += (bytes - *bytes_p);
return FASTPARSE_EXHAUSTED;
}
/* Functions exactly like str_fastparse, except it also accepts a 'state'
* argument, since the number's value is updated in the state. */
static int
jsonsl__num_fastparse(jsonsl_t jsn,
const jsonsl_uchar_t **bytes_p, size_t *nbytes_p,
struct jsonsl_state_st *state)
{
int exhausted = 1;
size_t nbytes = *nbytes_p;
const jsonsl_uchar_t *bytes = *bytes_p;
for (; nbytes; nbytes--, bytes++) {
jsonsl_uchar_t c = *bytes;
if (isdigit(c)) {
INCR_METRIC(TOTAL);
INCR_METRIC(NUMBER_FASTPATH);
state->nelem = (state->nelem * 10) + (c - 0x30);
} else {
exhausted = 0;
break;
}
}
jsn->pos += (*nbytes_p - nbytes);
if (exhausted) {
return FASTPARSE_EXHAUSTED;
}
*nbytes_p = nbytes;
*bytes_p = bytes;
return FASTPARSE_BREAK;
}
JSONSL_API
void
jsonsl_feed(jsonsl_t jsn, const jsonsl_char_t *bytes, size_t nbytes)
{
#define INVOKE_ERROR(eb) \
if (jsn->error_callback(jsn, JSONSL_ERROR_##eb, state, (char*)c)) { \
goto GT_AGAIN; \
} \
return;
#define STACK_PUSH \
if (jsn->level >= (levels_max-1)) { \
jsn->error_callback(jsn, JSONSL_ERROR_LEVELS_EXCEEDED, state, (char*)c); \
return; \
} \
state = jsn->stack + (++jsn->level); \
state->ignore_callback = jsn->stack[jsn->level-1].ignore_callback; \
state->pos_begin = jsn->pos;
#define STACK_POP_NOPOS \
state->pos_cur = jsn->pos; \
state = jsn->stack + (--jsn->level);
#define STACK_POP \
STACK_POP_NOPOS; \
state->pos_cur = jsn->pos;
#define CALLBACK_AND_POP_NOPOS(T) \
state->pos_cur = jsn->pos; \
DO_CALLBACK(T, POP); \
state->nescapes = 0; \
state = jsn->stack + (--jsn->level);
#define CALLBACK_AND_POP(T) \
CALLBACK_AND_POP_NOPOS(T); \
state->pos_cur = jsn->pos;
#define SPECIAL_POP \
CALLBACK_AND_POP(SPECIAL); \
jsn->expecting = 0; \
jsn->tok_last = 0; \
#define CUR_CHAR (*(jsonsl_uchar_t*)c)
#define DO_CALLBACK(T, action) \
if (jsn->call_##T && \
jsn->max_callback_level > state->level && \
state->ignore_callback == 0) { \
\
if (jsn->action_callback_##action) { \
jsn->action_callback_##action(jsn, JSONSL_ACTION_##action, state, (jsonsl_char_t*)c); \
} else if (jsn->action_callback) { \
jsn->action_callback(jsn, JSONSL_ACTION_##action, state, (jsonsl_char_t*)c); \
} \
if (jsn->stopfl) { return; } \
}
/**
* Verifies that we are able to insert the (non-string) item into a hash.
*/
#define ENSURE_HVAL \
if (state->nelem % 2 == 0 && state->type == JSONSL_T_OBJECT) { \
INVOKE_ERROR(HKEY_EXPECTED); \
}
#define VERIFY_SPECIAL(lit) \
if (CUR_CHAR != (lit)[jsn->pos - state->pos_begin]) { \
INVOKE_ERROR(SPECIAL_EXPECTED); \
}
#define VERIFY_SPECIAL_CI(lit) \
if (tolower(CUR_CHAR) != (lit)[jsn->pos - state->pos_begin]) { \
INVOKE_ERROR(SPECIAL_EXPECTED); \
}
#define STATE_SPECIAL_LENGTH \
(state)->nescapes
#define IS_NORMAL_NUMBER \
((state)->special_flags == JSONSL_SPECIALf_UNSIGNED || \
(state)->special_flags == JSONSL_SPECIALf_SIGNED)
#define STATE_NUM_LAST jsn->tok_last
#define CONTINUE_NEXT_CHAR() continue
const jsonsl_uchar_t *c = (jsonsl_uchar_t*)bytes;
size_t levels_max = jsn->levels_max;
struct jsonsl_state_st *state = jsn->stack + jsn->level;
jsn->base = bytes;
for (; nbytes; nbytes--, jsn->pos++, c++) {
unsigned state_type;
INCR_METRIC(TOTAL);
GT_AGAIN:
state_type = state->type;
/* Most common type is typically a string: */
if (state_type & JSONSL_Tf_STRINGY) {
/* Special escape handling for some stuff */
if (jsn->in_escape) {
jsn->in_escape = 0;
if (!is_allowed_escape(CUR_CHAR)) {
INVOKE_ERROR(ESCAPE_INVALID);
} else if (CUR_CHAR == 'u') {
DO_CALLBACK(UESCAPE, UESCAPE);
if (jsn->return_UESCAPE) {
return;
}
}
CONTINUE_NEXT_CHAR();
}
if (jsonsl__str_fastparse(jsn, &c, &nbytes) ==
FASTPARSE_EXHAUSTED) {
/* No need to readjust variables as we've exhausted the iterator */
return;
} else {
if (CUR_CHAR == '"') {
goto GT_QUOTE;
} else if (CUR_CHAR == '\\') {
goto GT_ESCAPE;
} else {
INVOKE_ERROR(WEIRD_WHITESPACE);
}
}
INCR_METRIC(STRINGY_SLOWPATH);
} else if (state_type == JSONSL_T_SPECIAL) {
/* Fast track for signed/unsigned */
if (IS_NORMAL_NUMBER) {
if (jsonsl__num_fastparse(jsn, &c, &nbytes, state) ==
FASTPARSE_EXHAUSTED) {
return;
} else {
goto GT_SPECIAL_NUMERIC;
}
} else if (state->special_flags == JSONSL_SPECIALf_DASH) {
#ifdef JSONSL_PARSE_NAN
if (CUR_CHAR == 'I' || CUR_CHAR == 'i') {
/* parsing -Infinity? */
state->special_flags = JSONSL_SPECIALf_NEG_INF;
CONTINUE_NEXT_CHAR();
}
#endif
if (!isdigit(CUR_CHAR)) {
INVOKE_ERROR(INVALID_NUMBER);
}
if (CUR_CHAR == '0') {
state->special_flags = JSONSL_SPECIALf_ZERO|JSONSL_SPECIALf_SIGNED;
} else if (isdigit(CUR_CHAR)) {
state->special_flags = JSONSL_SPECIALf_SIGNED;
state->nelem = CUR_CHAR - 0x30;
} else {
INVOKE_ERROR(INVALID_NUMBER);
}
CONTINUE_NEXT_CHAR();
} else if (state->special_flags == JSONSL_SPECIALf_ZERO) {
if (isdigit(CUR_CHAR)) {
/* Following a zero! */
INVOKE_ERROR(INVALID_NUMBER);
}
/* Unset the 'zero' flag: */
if (state->special_flags & JSONSL_SPECIALf_SIGNED) {
state->special_flags = JSONSL_SPECIALf_SIGNED;
} else {
state->special_flags = JSONSL_SPECIALf_UNSIGNED;
}
goto GT_SPECIAL_NUMERIC;
}
if ((state->special_flags & JSONSL_SPECIALf_NUMERIC) &&
!(state->special_flags & JSONSL_SPECIALf_INF)) {
GT_SPECIAL_NUMERIC:
switch (CUR_CHAR) {
CASE_DIGITS
STATE_NUM_LAST = '1';
CONTINUE_NEXT_CHAR();
case '.':
if (state->special_flags & JSONSL_SPECIALf_FLOAT) {
INVOKE_ERROR(INVALID_NUMBER);
}
state->special_flags |= JSONSL_SPECIALf_FLOAT;
STATE_NUM_LAST = '.';
CONTINUE_NEXT_CHAR();
case 'e':
case 'E':
if (state->special_flags & JSONSL_SPECIALf_EXPONENT) {
INVOKE_ERROR(INVALID_NUMBER);
}
state->special_flags |= JSONSL_SPECIALf_EXPONENT;
STATE_NUM_LAST = 'e';
CONTINUE_NEXT_CHAR();
case '-':
case '+':
if (STATE_NUM_LAST != 'e') {
INVOKE_ERROR(INVALID_NUMBER);
}
STATE_NUM_LAST = '-';
CONTINUE_NEXT_CHAR();
default:
if (is_special_end(CUR_CHAR)) {
goto GT_SPECIAL_POP;
}
INVOKE_ERROR(INVALID_NUMBER);
break;
}
}
/* else if (!NUMERIC) */
if (!is_special_end(CUR_CHAR)) {
STATE_SPECIAL_LENGTH++;
/* Verify TRUE, FALSE, NULL */
if (state->special_flags == JSONSL_SPECIALf_TRUE) {
VERIFY_SPECIAL("true");
} else if (state->special_flags == JSONSL_SPECIALf_FALSE) {
VERIFY_SPECIAL("false");
} else if (state->special_flags == JSONSL_SPECIALf_NULL) {
VERIFY_SPECIAL("null");
#ifdef JSONSL_PARSE_NAN
} else if (state->special_flags == JSONSL_SPECIALf_POS_INF) {
VERIFY_SPECIAL_CI("infinity");
} else if (state->special_flags == JSONSL_SPECIALf_NEG_INF) {
VERIFY_SPECIAL_CI("-infinity");
} else if (state->special_flags == JSONSL_SPECIALf_NAN) {
VERIFY_SPECIAL_CI("nan");
} else if (state->special_flags & JSONSL_SPECIALf_NULL ||
state->special_flags & JSONSL_SPECIALf_NAN) {
/* previous char was "n", are we parsing null or nan? */
if (CUR_CHAR != 'u') {
state->special_flags &= ~JSONSL_SPECIALf_NULL;
}
if (tolower(CUR_CHAR) != 'a') {
state->special_flags &= ~JSONSL_SPECIALf_NAN;
}
#endif
}
INCR_METRIC(SPECIAL_FASTPATH);
CONTINUE_NEXT_CHAR();
}
GT_SPECIAL_POP:
jsn->can_insert = 0;
if (IS_NORMAL_NUMBER) {
/* Nothing */
} else if (state->special_flags == JSONSL_SPECIALf_ZERO ||
state->special_flags == (JSONSL_SPECIALf_ZERO|JSONSL_SPECIALf_SIGNED)) {
/* 0 is unsigned! */
state->special_flags = JSONSL_SPECIALf_UNSIGNED;
} else if (state->special_flags == JSONSL_SPECIALf_DASH) {
/* Still in dash! */
INVOKE_ERROR(INVALID_NUMBER);
} else if (state->special_flags & JSONSL_SPECIALf_INF) {
if (STATE_SPECIAL_LENGTH != 8) {
INVOKE_ERROR(SPECIAL_INCOMPLETE);
}
state->nelem = 1;
} else if (state->special_flags & JSONSL_SPECIALf_NUMERIC) {
/* Check that we're not at the end of a token */
if (STATE_NUM_LAST != '1') {
INVOKE_ERROR(INVALID_NUMBER);
}
} else if (state->special_flags == JSONSL_SPECIALf_TRUE) {
if (STATE_SPECIAL_LENGTH != 4) {
INVOKE_ERROR(SPECIAL_INCOMPLETE);
}
state->nelem = 1;
} else if (state->special_flags == JSONSL_SPECIALf_FALSE) {
if (STATE_SPECIAL_LENGTH != 5) {
INVOKE_ERROR(SPECIAL_INCOMPLETE);
}
} else if (state->special_flags == JSONSL_SPECIALf_NULL) {
if (STATE_SPECIAL_LENGTH != 4) {
INVOKE_ERROR(SPECIAL_INCOMPLETE);
}
}
SPECIAL_POP;
jsn->expecting = ',';
if (is_allowed_whitespace(CUR_CHAR)) {
CONTINUE_NEXT_CHAR();
}
/**
* This works because we have a non-whitespace token
* which is not a special token. If this is a structural
* character then it will be gracefully handled by the
* switch statement. Otherwise it will default to the 'special'
* state again,
*/
goto GT_STRUCTURAL_TOKEN;
} else if (is_allowed_whitespace(CUR_CHAR)) {
INCR_METRIC(ALLOWED_WHITESPACE);
/* So we're not special. Harmless insignificant whitespace
* passthrough
*/
CONTINUE_NEXT_CHAR();
} else if (extract_special(CUR_CHAR)) {
/* not a string, whitespace, or structural token. must be special */
goto GT_SPECIAL_BEGIN;
}
INCR_GENERIC(CUR_CHAR);
if (CUR_CHAR == '"') {
GT_QUOTE:
jsn->can_insert = 0;
switch (state_type) {
/* the end of a string or hash key */
case JSONSL_T_STRING:
CALLBACK_AND_POP(STRING);
CONTINUE_NEXT_CHAR();
case JSONSL_T_HKEY:
CALLBACK_AND_POP(HKEY);
CONTINUE_NEXT_CHAR();
case JSONSL_T_OBJECT:
state->nelem++;
if ( (state->nelem-1) % 2 ) {
/* Odd, this must be a hash value */
if (jsn->tok_last != ':') {
INVOKE_ERROR(MISSING_TOKEN);
}
jsn->expecting = ','; /* Can't figure out what to expect next */
jsn->tok_last = 0;
STACK_PUSH;
state->type = JSONSL_T_STRING;
DO_CALLBACK(STRING, PUSH);
} else {
/* hash key */
if (jsn->expecting != '"') {
INVOKE_ERROR(STRAY_TOKEN);
}
jsn->tok_last = 0;
jsn->expecting = ':';
STACK_PUSH;
state->type = JSONSL_T_HKEY;
DO_CALLBACK(HKEY, PUSH);
}
CONTINUE_NEXT_CHAR();
case JSONSL_T_LIST:
state->nelem++;
STACK_PUSH;
state->type = JSONSL_T_STRING;
jsn->expecting = ',';
jsn->tok_last = 0;
DO_CALLBACK(STRING, PUSH);
CONTINUE_NEXT_CHAR();
case JSONSL_T_SPECIAL:
INVOKE_ERROR(STRAY_TOKEN);
break;
default:
INVOKE_ERROR(STRING_OUTSIDE_CONTAINER);
break;
} /* switch(state->type) */
} else if (CUR_CHAR == '\\') {
GT_ESCAPE:
INCR_METRIC(ESCAPES);
/* Escape */
if ( (state->type & JSONSL_Tf_STRINGY) == 0 ) {
INVOKE_ERROR(ESCAPE_OUTSIDE_STRING);
}
state->nescapes++;
jsn->in_escape = 1;
CONTINUE_NEXT_CHAR();
} /* " or \ */
GT_STRUCTURAL_TOKEN:
switch (CUR_CHAR) {
case ':':
INCR_METRIC(STRUCTURAL_TOKEN);
if (jsn->expecting != CUR_CHAR) {
INVOKE_ERROR(STRAY_TOKEN);
}
jsn->tok_last = ':';
jsn->can_insert = 1;
jsn->expecting = '"';
CONTINUE_NEXT_CHAR();
case ',':
INCR_METRIC(STRUCTURAL_TOKEN);
/**
* The comma is one of the more generic tokens.
* In the context of an OBJECT, the can_insert flag
* should never be set, and no other action is
* necessary.
*/
if (jsn->expecting != CUR_CHAR) {
/* make this branch execute only when we haven't manually
* just placed the ',' in the expecting register.
*/
INVOKE_ERROR(STRAY_TOKEN);
}
if (state->type == JSONSL_T_OBJECT) {
/* end of hash value, expect a string as a hash key */
jsn->expecting = '"';
} else {
jsn->can_insert = 1;
}
jsn->tok_last = ',';
jsn->expecting = '"';
CONTINUE_NEXT_CHAR();
/* new list or object */
/* hashes are more common */
case '{':
case '[':
INCR_METRIC(STRUCTURAL_TOKEN);
if (!jsn->can_insert) {
INVOKE_ERROR(CANT_INSERT);
}
ENSURE_HVAL;
state->nelem++;
STACK_PUSH;
/* because the constants match the opening delimiters, we can do this: */
state->type = CUR_CHAR;
state->nelem = 0;
jsn->can_insert = 1;
if (CUR_CHAR == '{') {
/* If we're a hash, we expect a key first, which is quouted */
jsn->expecting = '"';
}
if (CUR_CHAR == JSONSL_T_OBJECT) {
DO_CALLBACK(OBJECT, PUSH);
} else {
DO_CALLBACK(LIST, PUSH);
}
jsn->tok_last = 0;
CONTINUE_NEXT_CHAR();
/* closing of list or object */
case '}':
case ']':
INCR_METRIC(STRUCTURAL_TOKEN);
if (jsn->tok_last == ',' && jsn->options.allow_trailing_comma == 0) {
INVOKE_ERROR(TRAILING_COMMA);
}
jsn->can_insert = 0;
jsn->level--;
jsn->expecting = ',';
jsn->tok_last = 0;
if (CUR_CHAR == ']') {
if (state->type != '[') {
INVOKE_ERROR(BRACKET_MISMATCH);
}
DO_CALLBACK(LIST, POP);
} else {
if (state->type != '{') {
INVOKE_ERROR(BRACKET_MISMATCH);
} else if (state->nelem && state->nelem % 2 != 0) {
INVOKE_ERROR(VALUE_EXPECTED);
}
DO_CALLBACK(OBJECT, POP);
}
state = jsn->stack + jsn->level;
state->pos_cur = jsn->pos;
CONTINUE_NEXT_CHAR();
default:
GT_SPECIAL_BEGIN:
/**
* Not a string, not a structural token, and not benign whitespace.
* Technically we should iterate over the character always, but since
* we are not doing full numerical/value decoding anyway (but only hinting),
* we only check upon entry.
*/
if (state->type != JSONSL_T_SPECIAL) {
int special_flags = extract_special(CUR_CHAR);
if (!special_flags) {
/**
* Try to do some heuristics here anyway to figure out what kind of
* error this is. The 'special' case is a fallback scenario anyway.
*/
if (CUR_CHAR == '\0') {
INVOKE_ERROR(FOUND_NULL_BYTE);
} else if (CUR_CHAR < 0x20) {
INVOKE_ERROR(WEIRD_WHITESPACE);
} else {
INVOKE_ERROR(SPECIAL_EXPECTED);
}
}
ENSURE_HVAL;
state->nelem++;
if (!jsn->can_insert) {
INVOKE_ERROR(CANT_INSERT);
}
STACK_PUSH;
state->type = JSONSL_T_SPECIAL;
state->special_flags = special_flags;
STATE_SPECIAL_LENGTH = 1;
if (special_flags == JSONSL_SPECIALf_UNSIGNED) {
state->nelem = CUR_CHAR - 0x30;
STATE_NUM_LAST = '1';
} else {
STATE_NUM_LAST = '-';
state->nelem = 0;
}
DO_CALLBACK(SPECIAL, PUSH);
}
CONTINUE_NEXT_CHAR();
}
}
}
JSONSL_API
const char* jsonsl_strerror(jsonsl_error_t err)
{
if (err == JSONSL_ERROR_SUCCESS) {
return "SUCCESS";
}
#define X(t) \
if (err == JSONSL_ERROR_##t) \
return #t;
JSONSL_XERR;
#undef X
return "<UNKNOWN_ERROR>";
}
JSONSL_API
const char *jsonsl_strtype(jsonsl_type_t type)
{
#define X(o,c) \
if (type == JSONSL_T_##o) \
return #o;
JSONSL_XTYPE
#undef X
return "UNKNOWN TYPE";
}
/*
*
* JPR/JSONPointer functions
*
*
*/
#ifndef JSONSL_NO_JPR
static
jsonsl_jpr_type_t
populate_component(char *in,
struct jsonsl_jpr_component_st *component,
char **next,
jsonsl_error_t *errp)
{
unsigned long pctval;
char *c = NULL, *outp = NULL, *end = NULL;
size_t input_len;
jsonsl_jpr_type_t ret = JSONSL_PATH_NONE;
if (*next == NULL || *(*next) == '\0') {
return JSONSL_PATH_NONE;
}
/* Replace the next / with a NULL */
*next = strstr(in, "/");
if (*next != NULL) {
*(*next) = '\0'; /* drop the forward slash */
input_len = *next - in;
end = *next;
*next += 1; /* next character after the '/' */
} else {
input_len = strlen(in);
end = in + input_len + 1;
}
component->pstr = in;
/* Check for special components of interest */
if (*in == JSONSL_PATH_WILDCARD_CHAR && input_len == 1) {
/* Lone wildcard */
ret = JSONSL_PATH_WILDCARD;
goto GT_RET;
} else if (isdigit(*in)) {
/* ASCII Numeric */
char *endptr;
component->idx = strtoul(in, &endptr, 10);
if (endptr && *endptr == '\0') {
ret = JSONSL_PATH_NUMERIC;
goto GT_RET;
}
}
/* Default, it's a string */
ret = JSONSL_PATH_STRING;
for (c = outp = in; c < end; c++, outp++) {
char origc;
if (*c != '%') {
goto GT_ASSIGN;
}
/*
* c = { [+0] = '%', [+1] = 'b', [+2] = 'e', [+3] = '\0' }
*/
/* Need %XX */
if (c+2 >= end) {
*errp = JSONSL_ERROR_PERCENT_BADHEX;
return JSONSL_PATH_INVALID;
}
if (! (isxdigit(*(c+1)) && isxdigit(*(c+2))) ) {
*errp = JSONSL_ERROR_PERCENT_BADHEX;
return JSONSL_PATH_INVALID;
}
/* Temporarily null-terminate the characters */
origc = *(c+3);
*(c+3) = '\0';
pctval = strtoul(c+1, NULL, 16);
*(c+3) = origc;
*outp = (char) pctval;
c += 2;
continue;
GT_ASSIGN:
*outp = *c;
}
/* Null-terminate the string */
for (; outp < c; outp++) {
*outp = '\0';
}
GT_RET:
component->ptype = ret;
if (ret != JSONSL_PATH_WILDCARD) {
component->len = strlen(component->pstr);
}
return ret;
}
JSONSL_API
jsonsl_jpr_t
jsonsl_jpr_new(const char *path, jsonsl_error_t *errp)
{
char *my_copy = NULL;
int count, curidx;
struct jsonsl_jpr_st *ret = NULL;
struct jsonsl_jpr_component_st *components = NULL;
size_t origlen;
jsonsl_error_t errstacked;
#define JPR_BAIL(err) *errp = err; goto GT_ERROR;
if (errp == NULL) {
errp = &errstacked;
}
if (path == NULL || *path != '/') {
JPR_BAIL(JSONSL_ERROR_JPR_NOROOT);
}
count = 1;
path++;
{
const char *c = path;
for (; *c; c++) {
if (*c == '/') {
count++;
if (*(c+1) == '/') {
JPR_BAIL(JSONSL_ERROR_JPR_DUPSLASH);
}
}
}
}
if(*path) {
count++;
}
components = (struct jsonsl_jpr_component_st *)
malloc(sizeof(*components) * count);
if (!components) {
JPR_BAIL(JSONSL_ERROR_ENOMEM);
}
my_copy = (char *)malloc(strlen(path) + 1);
if (!my_copy) {
JPR_BAIL(JSONSL_ERROR_ENOMEM);
}
strcpy(my_copy, path);
components[0].ptype = JSONSL_PATH_ROOT;
if (*my_copy) {
char *cur = my_copy;
int pathret = JSONSL_PATH_STRING;
curidx = 1;
while (curidx < count) {
pathret = populate_component(cur, components + curidx, &cur, errp);
if (pathret > 0) {
curidx++;
} else {
break;
}
}
if (pathret == JSONSL_PATH_INVALID) {
JPR_BAIL(JSONSL_ERROR_JPR_BADPATH);
}
} else {
curidx = 1;
}
path--; /*revert path to leading '/' */
origlen = strlen(path) + 1;
ret = (struct jsonsl_jpr_st *)malloc(sizeof(*ret));
if (!ret) {
JPR_BAIL(JSONSL_ERROR_ENOMEM);
}
ret->orig = (char *)malloc(origlen);
if (!ret->orig) {
JPR_BAIL(JSONSL_ERROR_ENOMEM);
}
ret->components = components;
ret->ncomponents = curidx;
ret->basestr = my_copy;
ret->norig = origlen-1;
strcpy(ret->orig, path);
return ret;
GT_ERROR:
free(my_copy);
free(components);
if (ret) {
free(ret->orig);
}
free(ret);
return NULL;
#undef JPR_BAIL
}
void jsonsl_jpr_destroy(jsonsl_jpr_t jpr)
{
free(jpr->components);
free(jpr->basestr);
free(jpr->orig);
free(jpr);
}
/**
* Call when there is a possibility of a match, either as a final match or
* as a path within a match
* @param jpr The JPR path
* @param component Component corresponding to the current element
* @param prlevel The level of the *parent*
* @param chtype The type of the child
* @return Match status
*/
static jsonsl_jpr_match_t
jsonsl__match_continue(jsonsl_jpr_t jpr,
const struct jsonsl_jpr_component_st *component,
unsigned prlevel, unsigned chtype)
{
const struct jsonsl_jpr_component_st *next_comp = component + 1;
if (prlevel == jpr->ncomponents - 1) {
/* This is the match. Check the expected type of the match against
* the child */
if (jpr->match_type == 0 || jpr->match_type == chtype) {
return JSONSL_MATCH_COMPLETE;
} else {
return JSONSL_MATCH_TYPE_MISMATCH;
}