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protobuf/upb/json/parser.c

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#line 1 "upb/json/parser.rl"
/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2014 Google Inc. See LICENSE for details.
* Author: Josh Haberman <jhaberman@gmail.com>
*
* A parser that uses the Ragel State Machine Compiler to generate
* the finite automata.
*
* Ragel only natively handles regular languages, but we can manually
* program it a bit to handle context-free languages like JSON, by using
* the "fcall" and "fret" constructs.
*
* This parser can handle the basics, but needs several things to be fleshed
* out:
*
* - handling of unicode escape sequences (including high surrogate pairs).
* - properly check and report errors for unknown fields, stack overflow,
* improper array nesting (or lack of nesting).
* - handling of base64 sequences with padding characters.
* - handling of push-back (non-success returns from sink functions).
* - handling of keys/escape-sequences/etc that span input buffers.
*/
#include <stdio.h>
#include <stdint.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "upb/json/parser.h"
#define PARSER_CHECK_RETURN(x) if (!(x)) return false
static upb_selector_t getsel_for_handlertype(upb_json_parser *p,
upb_handlertype_t type) {
upb_selector_t sel;
bool ok = upb_handlers_getselector(p->top->f, type, &sel);
UPB_ASSERT_VAR(ok, ok);
return sel;
}
static upb_selector_t parser_getsel(upb_json_parser *p) {
return getsel_for_handlertype(
p, upb_handlers_getprimitivehandlertype(p->top->f));
}
static void start_member(upb_json_parser *p) {
assert(!p->top->f);
assert(!p->accumulated);
p->accumulated_len = 0;
}
static bool end_member(upb_json_parser *p) {
// TODO(haberman): support keys that span buffers or have escape sequences.
assert(!p->top->f);
assert(p->accumulated);
const upb_fielddef *f =
upb_msgdef_ntof(p->top->m, p->accumulated, p->accumulated_len);
if (!f) {
// TODO(haberman): Ignore unknown fields if requested/configured to do so.
upb_status_seterrf(p->status, "No such field: %.*s\n",
(int)p->accumulated_len, p->accumulated);
return false;
}
p->top->f = f;
p->accumulated = NULL;
return true;
}
static void start_object(upb_json_parser *p) {
upb_sink_startmsg(&p->top->sink);
}
static void end_object(upb_json_parser *p) {
upb_status status;
upb_sink_endmsg(&p->top->sink, &status);
}
static bool check_stack(upb_json_parser *p) {
if ((p->top + 1) == p->limit) {
upb_status_seterrmsg(p->status, "Nesting too deep");
return false;
}
return true;
}
static bool start_subobject(upb_json_parser *p) {
assert(p->top->f);
if (!upb_fielddef_issubmsg(p->top->f)) {
upb_status_seterrf(p->status,
"Object specified for non-message/group field: %s",
upb_fielddef_name(p->top->f));
return false;
}
if (!check_stack(p)) return false;
upb_jsonparser_frame *inner = p->top + 1;
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSUBMSG);
upb_sink_startsubmsg(&p->top->sink, sel, &inner->sink);
inner->m = upb_fielddef_msgsubdef(p->top->f);
inner->f = NULL;
p->top = inner;
return true;
}
static void end_subobject(upb_json_parser *p) {
p->top--;
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSUBMSG);
upb_sink_endsubmsg(&p->top->sink, sel);
}
static bool start_array(upb_json_parser *p) {
assert(p->top->f);
if (!upb_fielddef_isseq(p->top->f)) {
upb_status_seterrf(p->status,
"Array specified for non-repeated field: %s",
upb_fielddef_name(p->top->f));
return false;
}
if (!check_stack(p)) return false;
upb_jsonparser_frame *inner = p->top + 1;
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSEQ);
upb_sink_startseq(&p->top->sink, sel, &inner->sink);
inner->m = p->top->m;
inner->f = p->top->f;
p->top = inner;
return true;
}
static void end_array(upb_json_parser *p) {
assert(p->top > p->stack);
p->top--;
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSEQ);
upb_sink_endseq(&p->top->sink, sel);
}
static void clear_member(upb_json_parser *p) { p->top->f = NULL; }
static bool parser_putbool(upb_json_parser *p, bool val) {
if (upb_fielddef_type(p->top->f) != UPB_TYPE_BOOL) {
upb_status_seterrf(p->status,
"Boolean value specified for non-bool field: %s",
upb_fielddef_name(p->top->f));
return false;
}
bool ok = upb_sink_putbool(&p->top->sink, parser_getsel(p), val);
UPB_ASSERT_VAR(ok, ok);
return true;
}
static void start_text(upb_json_parser *p, const char *ptr) {
p->text_begin = ptr;
}
static const signed char b64table[] = {
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, 62/*+*/, -1, -1, -1, 63/*/ */,
52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
60/*8*/, 61/*9*/, -1, -1, -1, -1, -1, -1,
-1, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/,
07/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
23/*X*/, 24/*Y*/, 25/*Z*/, -1, -1, -1, -1, -1,
-1, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
49/*x*/, 50/*y*/, 51/*z*/, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1
};
// Returns the table value sign-extended to 32 bits. Knowing that the upper
// bits will be 1 for unrecognized characters makes it easier to check for
// this error condition later (see below).
int32_t b64lookup(unsigned char ch) { return b64table[ch]; }
// Returns true if the given character is not a valid base64 character or
// padding.
bool nonbase64(unsigned char ch) { return b64lookup(ch) == -1 && ch != '='; }
static bool base64_push(upb_json_parser *p, upb_selector_t sel, const char *ptr,
size_t len) {
const char *limit = ptr + len;
for (; ptr < limit; ptr += 4) {
if (limit - ptr < 4) {
upb_status_seterrf(p->status,
"Base64 input for bytes field not a multiple of 4: %s",
upb_fielddef_name(p->top->f));
return false;
}
uint32_t val = b64lookup(ptr[0]) << 18 |
b64lookup(ptr[1]) << 12 |
b64lookup(ptr[2]) << 6 |
b64lookup(ptr[3]);
// Test the upper bit; returns true if any of the characters returned -1.
if (val & 0x80000000) {
goto otherchar;
}
char output[3];
output[0] = val >> 16;
output[1] = (val >> 8) & 0xff;
output[2] = val & 0xff;
upb_sink_putstring(&p->top->sink, sel, output, 3, NULL);
}
return true;
otherchar:
if (nonbase64(ptr[0]) || nonbase64(ptr[1]) || nonbase64(ptr[2]) ||
nonbase64(ptr[3]) ) {
upb_status_seterrf(p->status,
"Non-base64 characters in bytes field: %s",
upb_fielddef_name(p->top->f));
return false;
} if (ptr[2] == '=') {
// Last group contains only two input bytes, one output byte.
if (ptr[0] == '=' || ptr[1] == '=' || ptr[3] != '=') {
goto badpadding;
}
uint32_t val = b64lookup(ptr[0]) << 18 |
b64lookup(ptr[1]) << 12;
assert(!(val & 0x80000000));
char output = val >> 16;
upb_sink_putstring(&p->top->sink, sel, &output, 1, NULL);
return true;
} else {
// Last group contains only three input bytes, two output bytes.
if (ptr[0] == '=' || ptr[1] == '=' || ptr[2] == '=') {
goto badpadding;
}
uint32_t val = b64lookup(ptr[0]) << 18 |
b64lookup(ptr[1]) << 12 |
b64lookup(ptr[2]) << 6;
char output[2];
output[0] = val >> 16;
output[1] = (val >> 8) & 0xff;
upb_sink_putstring(&p->top->sink, sel, output, 2, NULL);
return true;
}
badpadding:
upb_status_seterrf(p->status,
"Incorrect base64 padding for field: %s (%.*s)",
upb_fielddef_name(p->top->f),
4, ptr);
return false;
}
static bool end_text(upb_json_parser *p, const char *ptr, bool is_num) {
assert(!p->accumulated); // TODO: handle this case.
p->accumulated = p->text_begin;
p->accumulated_len = ptr - p->text_begin;
if (p->top->f && upb_fielddef_isstring(p->top->f)) {
// This is a string field (as opposed to a member name).
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_STRING);
if (upb_fielddef_type(p->top->f) == UPB_TYPE_BYTES) {
PARSER_CHECK_RETURN(base64_push(p, sel, p->accumulated,
p->accumulated_len));
} else {
upb_sink_putstring(&p->top->sink, sel, p->accumulated, p->accumulated_len, NULL);
}
p->accumulated = NULL;
} else if (p->top->f &&
upb_fielddef_type(p->top->f) == UPB_TYPE_ENUM &&
!is_num) {
// Enum case: resolve enum symbolic name to integer value.
const upb_enumdef *enumdef =
(const upb_enumdef*)upb_fielddef_subdef(p->top->f);
int32_t int_val = 0;
if (upb_enumdef_ntoi(enumdef, p->accumulated, p->accumulated_len,
&int_val)) {
upb_selector_t sel = parser_getsel(p);
upb_sink_putint32(&p->top->sink, sel, int_val);
} else {
upb_status_seterrmsg(p->status, "Enum value name unknown");
return false;
}
p->accumulated = NULL;
}
return true;
}
static bool start_stringval(upb_json_parser *p) {
assert(p->top->f);
if (upb_fielddef_isstring(p->top->f)) {
if (!check_stack(p)) return false;
// Start a new parser frame: parser frames correspond one-to-one with
// handler frames, and string events occur in a sub-frame.
upb_jsonparser_frame *inner = p->top + 1;
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSTR);
upb_sink_startstr(&p->top->sink, sel, 0, &inner->sink);
inner->m = p->top->m;
inner->f = p->top->f;
p->top = inner;
return true;
} else if (upb_fielddef_type(p->top->f) == UPB_TYPE_ENUM) {
// Do nothing -- symbolic enum names in quotes remain in the
// current parser frame.
return true;
} else {
upb_status_seterrf(p->status,
"String specified for non-string/non-enum field: %s",
upb_fielddef_name(p->top->f));
return false;
}
}
static void end_stringval(upb_json_parser *p) {
if (upb_fielddef_isstring(p->top->f)) {
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
upb_sink_endstr(&p->top->sink, sel);
p->top--;
}
}
static void start_number(upb_json_parser *p, const char *ptr) {
start_text(p, ptr);
assert(p->accumulated == NULL);
}
static void end_number(upb_json_parser *p, const char *ptr) {
end_text(p, ptr, true);
const char *myend = p->accumulated + p->accumulated_len;
char *end;
switch (upb_fielddef_type(p->top->f)) {
case UPB_TYPE_ENUM:
case UPB_TYPE_INT32: {
long val = strtol(p->accumulated, &end, 0);
if (val > INT32_MAX || val < INT32_MIN || errno == ERANGE || end != myend)
assert(false);
else
upb_sink_putint32(&p->top->sink, parser_getsel(p), val);
break;
}
case UPB_TYPE_INT64: {
long long val = strtoll(p->accumulated, &end, 0);
if (val > INT64_MAX || val < INT64_MIN || errno == ERANGE || end != myend)
assert(false);
else
upb_sink_putint64(&p->top->sink, parser_getsel(p), val);
break;
}
case UPB_TYPE_UINT32: {
unsigned long val = strtoul(p->accumulated, &end, 0);
if (val > UINT32_MAX || errno == ERANGE || end != myend)
assert(false);
else
upb_sink_putuint32(&p->top->sink, parser_getsel(p), val);
break;
}
case UPB_TYPE_UINT64: {
unsigned long long val = strtoull(p->accumulated, &end, 0);
if (val > UINT64_MAX || errno == ERANGE || end != myend)
assert(false);
else
upb_sink_putuint64(&p->top->sink, parser_getsel(p), val);
break;
}
case UPB_TYPE_DOUBLE: {
double val = strtod(p->accumulated, &end);
if (errno == ERANGE || end != myend)
assert(false);
else
upb_sink_putdouble(&p->top->sink, parser_getsel(p), val);
break;
}
case UPB_TYPE_FLOAT: {
float val = strtof(p->accumulated, &end);
if (errno == ERANGE || end != myend)
assert(false);
else
upb_sink_putfloat(&p->top->sink, parser_getsel(p), val);
break;
}
default:
assert(false);
}
p->accumulated = NULL;
}
static char escape_char(char in) {
switch (in) {
case 'r': return '\r';
case 't': return '\t';
case 'n': return '\n';
case 'f': return '\f';
case 'b': return '\b';
case '/': return '/';
case '"': return '"';
case '\\': return '\\';
default:
assert(0);
return 'x';
}
}
static void escape(upb_json_parser *p, const char *ptr) {
char ch = escape_char(*ptr);
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_STRING);
upb_sink_putstring(&p->top->sink, sel, &ch, 1, NULL);
}
static uint8_t hexdigit(char ch) {
if (ch >= '0' && ch <= '9') {
return ch - '0';
} else if (ch >= 'a' && ch <= 'f') {
return ch - 'a' + 10;
} else {
assert(ch >= 'A' && ch <= 'F');
return ch - 'A' + 10;
}
}
static void start_hex(upb_json_parser *p, const char *ptr) {
start_text(p, ptr);
}
static void hex(upb_json_parser *p, const char *end) {
const char *start = p->text_begin;
UPB_ASSERT_VAR(end, end - start == 4);
uint16_t codepoint =
(hexdigit(start[0]) << 12) |
(hexdigit(start[1]) << 8) |
(hexdigit(start[2]) << 4) |
hexdigit(start[3]);
// emit the codepoint as UTF-8.
char utf8[3]; // support \u0000 -- \uFFFF -- need only three bytes.
int length = 0;
if (codepoint <= 0x7F) {
utf8[0] = codepoint;
length = 1;
} else if (codepoint <= 0x07FF) {
utf8[1] = (codepoint & 0x3F) | 0x80;
codepoint >>= 6;
utf8[0] = (codepoint & 0x1F) | 0xC0;
length = 2;
} else /* codepoint <= 0xFFFF */ {
utf8[2] = (codepoint & 0x3F) | 0x80;
codepoint >>= 6;
utf8[1] = (codepoint & 0x3F) | 0x80;
codepoint >>= 6;
utf8[0] = (codepoint & 0x0F) | 0xE0;
length = 3;
}
// TODO(haberman): Handle high surrogates: if codepoint is a high surrogate
// we have to wait for the next escape to get the full code point).
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_STRING);
upb_sink_putstring(&p->top->sink, sel, utf8, length, NULL);
}
#define CHECK_RETURN_TOP(x) if (!(x)) goto error
// What follows is the Ragel parser itself. The language is specified in Ragel
// and the actions call our C functions above.
#line 596 "upb/json/parser.rl"
#line 514 "upb/json/parser.c"
static const char _json_actions[] = {
0, 1, 0, 1, 2, 1, 3, 1,
4, 1, 5, 1, 6, 1, 7, 1,
9, 1, 11, 1, 12, 1, 13, 1,
14, 1, 15, 1, 16, 1, 24, 1,
26, 2, 3, 7, 2, 5, 2, 2,
5, 7, 2, 10, 8, 2, 12, 14,
2, 13, 14, 2, 17, 1, 2, 18,
26, 2, 19, 8, 2, 20, 26, 2,
21, 26, 2, 22, 26, 2, 23, 26,
2, 25, 26, 3, 13, 10, 8
};
static const unsigned char _json_key_offsets[] = {
0, 0, 4, 9, 14, 18, 22, 27,
32, 37, 41, 45, 48, 51, 53, 57,
61, 63, 65, 70, 72, 74, 83, 89,
95, 101, 107, 109, 118, 118, 118, 123,
128, 133, 133, 134, 135, 136, 137, 137,
138, 139, 140, 140, 141, 142, 143, 143,
148, 153, 157, 161, 166, 171, 176, 180,
180, 183, 183, 183
};
static const char _json_trans_keys[] = {
32, 123, 9, 13, 32, 34, 125, 9,
13, 32, 34, 125, 9, 13, 32, 58,
9, 13, 32, 58, 9, 13, 32, 93,
125, 9, 13, 32, 44, 125, 9, 13,
32, 44, 125, 9, 13, 32, 34, 9,
13, 45, 48, 49, 57, 48, 49, 57,
46, 69, 101, 48, 57, 69, 101, 48,
57, 43, 45, 48, 57, 48, 57, 48,
57, 46, 69, 101, 48, 57, 34, 92,
34, 92, 34, 47, 92, 98, 102, 110,
114, 116, 117, 48, 57, 65, 70, 97,
102, 48, 57, 65, 70, 97, 102, 48,
57, 65, 70, 97, 102, 48, 57, 65,
70, 97, 102, 34, 92, 34, 45, 91,
102, 110, 116, 123, 48, 57, 32, 93,
125, 9, 13, 32, 44, 93, 9, 13,
32, 93, 125, 9, 13, 97, 108, 115,
101, 117, 108, 108, 114, 117, 101, 32,
34, 125, 9, 13, 32, 34, 125, 9,
13, 32, 58, 9, 13, 32, 58, 9,
13, 32, 93, 125, 9, 13, 32, 44,
125, 9, 13, 32, 44, 125, 9, 13,
32, 34, 9, 13, 32, 9, 13, 0
};
static const char _json_single_lengths[] = {
0, 2, 3, 3, 2, 2, 3, 3,
3, 2, 2, 1, 3, 0, 2, 2,
0, 0, 3, 2, 2, 9, 0, 0,
0, 0, 2, 7, 0, 0, 3, 3,
3, 0, 1, 1, 1, 1, 0, 1,
1, 1, 0, 1, 1, 1, 0, 3,
3, 2, 2, 3, 3, 3, 2, 0,
1, 0, 0, 0
};
static const char _json_range_lengths[] = {
0, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 0, 1, 1, 1,
1, 1, 1, 0, 0, 0, 3, 3,
3, 3, 0, 1, 0, 0, 1, 1,
1, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 0,
1, 0, 0, 0
};
static const short _json_index_offsets[] = {
0, 0, 4, 9, 14, 18, 22, 27,
32, 37, 41, 45, 48, 52, 54, 58,
62, 64, 66, 71, 74, 77, 87, 91,
95, 99, 103, 106, 115, 116, 117, 122,
127, 132, 133, 135, 137, 139, 141, 142,
144, 146, 148, 149, 151, 153, 155, 156,
161, 166, 170, 174, 179, 184, 189, 193,
194, 197, 198, 199
};
static const char _json_indicies[] = {
0, 2, 0, 1, 3, 4, 5, 3,
1, 6, 7, 8, 6, 1, 9, 10,
9, 1, 11, 12, 11, 1, 12, 1,
1, 12, 13, 14, 15, 16, 14, 1,
17, 18, 8, 17, 1, 18, 7, 18,
1, 19, 20, 21, 1, 20, 21, 1,
23, 24, 24, 22, 25, 1, 24, 24,
25, 22, 26, 26, 27, 1, 27, 1,
27, 22, 23, 24, 24, 21, 22, 29,
30, 28, 32, 33, 31, 34, 34, 34,
34, 34, 34, 34, 34, 35, 1, 36,
36, 36, 1, 37, 37, 37, 1, 38,
38, 38, 1, 39, 39, 39, 1, 41,
42, 40, 43, 44, 45, 46, 47, 48,
49, 44, 1, 50, 51, 53, 54, 1,
53, 52, 55, 56, 54, 55, 1, 56,
1, 1, 56, 52, 57, 58, 1, 59,
1, 60, 1, 61, 1, 62, 63, 1,
64, 1, 65, 1, 66, 67, 1, 68,
1, 69, 1, 70, 71, 72, 73, 71,
1, 74, 75, 76, 74, 1, 77, 78,
77, 1, 79, 80, 79, 1, 80, 1,
1, 80, 81, 82, 83, 84, 82, 1,
85, 86, 76, 85, 1, 86, 75, 86,
1, 87, 88, 88, 1, 1, 1, 1,
0
};
static const char _json_trans_targs[] = {
1, 0, 2, 3, 4, 56, 3, 4,
56, 5, 6, 5, 6, 7, 8, 9,
56, 8, 9, 11, 12, 18, 57, 13,
15, 14, 16, 17, 20, 58, 21, 20,
58, 21, 19, 22, 23, 24, 25, 26,
20, 58, 21, 28, 29, 30, 34, 39,
43, 47, 59, 59, 31, 30, 33, 31,
32, 59, 35, 36, 37, 38, 59, 40,
41, 42, 59, 44, 45, 46, 59, 48,
49, 55, 48, 49, 55, 50, 51, 50,
51, 52, 53, 54, 55, 53, 54, 59,
56
};
static const char _json_trans_actions[] = {
0, 0, 0, 21, 75, 48, 0, 42,
23, 17, 17, 0, 0, 15, 19, 19,
45, 0, 0, 0, 0, 0, 1, 0,
0, 0, 0, 0, 3, 13, 0, 0,
33, 5, 11, 0, 7, 0, 0, 0,
36, 39, 9, 57, 51, 25, 0, 0,
0, 29, 60, 54, 15, 0, 27, 0,
0, 31, 0, 0, 0, 0, 66, 0,
0, 0, 69, 0, 0, 0, 63, 21,
75, 48, 0, 42, 23, 17, 17, 0,
0, 15, 19, 19, 45, 0, 0, 72,
0
};
static const int json_start = 1;
static const int json_first_final = 56;
static const int json_error = 0;
static const int json_en_number_machine = 10;
static const int json_en_string_machine = 19;
static const int json_en_value_machine = 27;
static const int json_en_main = 1;
#line 599 "upb/json/parser.rl"
size_t parse(void *closure, const void *hd, const char *buf, size_t size,
const upb_bufhandle *handle) {
UPB_UNUSED(hd);
UPB_UNUSED(handle);
upb_json_parser *parser = closure;
// Variables used by Ragel's generated code.
int cs = parser->current_state;
int *stack = parser->parser_stack;
int top = parser->parser_top;
const char *p = buf;
const char *pe = buf + size;
#line 684 "upb/json/parser.c"
{
int _klen;
unsigned int _trans;
const char *_acts;
unsigned int _nacts;
const char *_keys;
if ( p == pe )
goto _test_eof;
if ( cs == 0 )
goto _out;
_resume:
_keys = _json_trans_keys + _json_key_offsets[cs];
_trans = _json_index_offsets[cs];
_klen = _json_single_lengths[cs];
if ( _klen > 0 ) {
const char *_lower = _keys;
const char *_mid;
const char *_upper = _keys + _klen - 1;
while (1) {
if ( _upper < _lower )
break;
_mid = _lower + ((_upper-_lower) >> 1);
if ( (*p) < *_mid )
_upper = _mid - 1;
else if ( (*p) > *_mid )
_lower = _mid + 1;
else {
_trans += (unsigned int)(_mid - _keys);
goto _match;
}
}
_keys += _klen;
_trans += _klen;
}
_klen = _json_range_lengths[cs];
if ( _klen > 0 ) {
const char *_lower = _keys;
const char *_mid;
const char *_upper = _keys + (_klen<<1) - 2;
while (1) {
if ( _upper < _lower )
break;
_mid = _lower + (((_upper-_lower) >> 1) & ~1);
if ( (*p) < _mid[0] )
_upper = _mid - 2;
else if ( (*p) > _mid[1] )
_lower = _mid + 2;
else {
_trans += (unsigned int)((_mid - _keys)>>1);
goto _match;
}
}
_trans += _klen;
}
_match:
_trans = _json_indicies[_trans];
cs = _json_trans_targs[_trans];
if ( _json_trans_actions[_trans] == 0 )
goto _again;
_acts = _json_actions + _json_trans_actions[_trans];
_nacts = (unsigned int) *_acts++;
while ( _nacts-- > 0 )
{
switch ( *_acts++ )
{
case 0:
#line 517 "upb/json/parser.rl"
{ p--; {cs = stack[--top]; goto _again;} }
break;
case 1:
#line 518 "upb/json/parser.rl"
{ p--; {stack[top++] = cs; cs = 10; goto _again;} }
break;
case 2:
#line 522 "upb/json/parser.rl"
{ start_text(parser, p); }
break;
case 3:
#line 523 "upb/json/parser.rl"
{ CHECK_RETURN_TOP(end_text(parser, p, false)); }
break;
case 4:
#line 529 "upb/json/parser.rl"
{ start_hex(parser, p); }
break;
case 5:
#line 530 "upb/json/parser.rl"
{ hex(parser, p); }
break;
case 6:
#line 536 "upb/json/parser.rl"
{ escape(parser, p); }
break;
case 7:
#line 539 "upb/json/parser.rl"
{ {cs = stack[--top]; goto _again;} }
break;
case 8:
#line 540 "upb/json/parser.rl"
{ {stack[top++] = cs; cs = 19; goto _again;} }
break;
case 9:
#line 542 "upb/json/parser.rl"
{ p--; {stack[top++] = cs; cs = 27; goto _again;} }
break;
case 10:
#line 547 "upb/json/parser.rl"
{ start_member(parser); }
break;
case 11:
#line 548 "upb/json/parser.rl"
{ CHECK_RETURN_TOP(end_member(parser)); }
break;
case 12:
#line 551 "upb/json/parser.rl"
{ clear_member(parser); }
break;
case 13:
#line 557 "upb/json/parser.rl"
{ start_object(parser); }
break;
case 14:
#line 560 "upb/json/parser.rl"
{ end_object(parser); }
break;
case 15:
#line 566 "upb/json/parser.rl"
{ CHECK_RETURN_TOP(start_array(parser)); }
break;
case 16:
#line 570 "upb/json/parser.rl"
{ end_array(parser); }
break;
case 17:
#line 575 "upb/json/parser.rl"
{ start_number(parser, p); }
break;
case 18:
#line 576 "upb/json/parser.rl"
{ end_number(parser, p); }
break;
case 19:
#line 578 "upb/json/parser.rl"
{ CHECK_RETURN_TOP(start_stringval(parser)); }
break;
case 20:
#line 579 "upb/json/parser.rl"
{ end_stringval(parser); }
break;
case 21:
#line 581 "upb/json/parser.rl"
{ CHECK_RETURN_TOP(parser_putbool(parser, true)); }
break;
case 22:
#line 583 "upb/json/parser.rl"
{ CHECK_RETURN_TOP(parser_putbool(parser, false)); }
break;
case 23:
#line 585 "upb/json/parser.rl"
{ /* null value */ }
break;
case 24:
#line 587 "upb/json/parser.rl"
{ CHECK_RETURN_TOP(start_subobject(parser)); }
break;
case 25:
#line 588 "upb/json/parser.rl"
{ end_subobject(parser); }
break;
case 26:
#line 593 "upb/json/parser.rl"
{ p--; {cs = stack[--top]; goto _again;} }
break;
#line 866 "upb/json/parser.c"
}
}
_again:
if ( cs == 0 )
goto _out;
if ( ++p != pe )
goto _resume;
_test_eof: {}
_out: {}
}
#line 615 "upb/json/parser.rl"
if (p != pe) {
upb_status_seterrf(parser->status, "Parse error at %s\n", p);
}
error:
// Save parsing state back to parser.
parser->current_state = cs;
parser->parser_top = top;
return p - buf;
}
bool end(void *closure, const void *hd) {
UPB_UNUSED(closure);
UPB_UNUSED(hd);
return true;
}
void upb_json_parser_init(upb_json_parser *p, upb_status *status) {
p->limit = p->stack + UPB_JSON_MAX_DEPTH;
upb_byteshandler_init(&p->input_handler_);
upb_byteshandler_setstring(&p->input_handler_, parse, NULL);
upb_byteshandler_setendstr(&p->input_handler_, end, NULL);
upb_bytessink_reset(&p->input_, &p->input_handler_, p);
p->status = status;
}
void upb_json_parser_uninit(upb_json_parser *p) {
upb_byteshandler_uninit(&p->input_handler_);
}
void upb_json_parser_reset(upb_json_parser *p) {
p->top = p->stack;
p->top->f = NULL;
int cs;
int top;
// Emit Ragel initialization of the parser.
#line 920 "upb/json/parser.c"
{
cs = json_start;
top = 0;
}
#line 655 "upb/json/parser.rl"
p->current_state = cs;
p->parser_top = top;
p->text_begin = NULL;
p->accumulated = NULL;
p->accumulated_len = 0;
}
void upb_json_parser_resetoutput(upb_json_parser *p, upb_sink *sink) {
upb_json_parser_reset(p);
upb_sink_reset(&p->top->sink, sink->handlers, sink->closure);
p->top->m = upb_handlers_msgdef(sink->handlers);
p->accumulated = NULL;
}
upb_bytessink *upb_json_parser_input(upb_json_parser *p) {
return &p->input_;
}