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protobuf/upb/json/parser.rl

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/*
** upb::json::Parser (upb_json_parser)
**
** 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 <ctype.h>
#include <errno.h>
#include <float.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "upb/json/parser.h"
#include "upb/pb/encoder.h"
#include "upb/port_def.inc"
#define UPB_JSON_MAX_DEPTH 64
/* Type of value message */
enum {
VALUE_NULLVALUE = 0,
VALUE_NUMBERVALUE = 1,
VALUE_STRINGVALUE = 2,
VALUE_BOOLVALUE = 3,
VALUE_STRUCTVALUE = 4,
VALUE_LISTVALUE = 5
};
/* Forward declare */
static bool is_top_level(upb_json_parser *p);
static bool is_wellknown_msg(upb_json_parser *p, upb_wellknowntype_t type);
static bool is_wellknown_field(upb_json_parser *p, upb_wellknowntype_t type);
static bool is_number_wrapper_object(upb_json_parser *p);
static bool does_number_wrapper_start(upb_json_parser *p);
static bool does_number_wrapper_end(upb_json_parser *p);
static bool is_string_wrapper_object(upb_json_parser *p);
static bool does_string_wrapper_start(upb_json_parser *p);
static bool does_string_wrapper_end(upb_json_parser *p);
static bool does_fieldmask_start(upb_json_parser *p);
static bool does_fieldmask_end(upb_json_parser *p);
static void start_fieldmask_object(upb_json_parser *p);
static void end_fieldmask_object(upb_json_parser *p);
static void start_wrapper_object(upb_json_parser *p);
static void end_wrapper_object(upb_json_parser *p);
static void start_value_object(upb_json_parser *p, int value_type);
static void end_value_object(upb_json_parser *p);
static void start_listvalue_object(upb_json_parser *p);
static void end_listvalue_object(upb_json_parser *p);
static void start_structvalue_object(upb_json_parser *p);
static void end_structvalue_object(upb_json_parser *p);
static void start_object(upb_json_parser *p);
static void end_object(upb_json_parser *p);
static void start_any_object(upb_json_parser *p, const char *ptr);
static bool end_any_object(upb_json_parser *p, const char *ptr);
static bool start_subobject(upb_json_parser *p);
static void end_subobject(upb_json_parser *p);
static void start_member(upb_json_parser *p);
static void end_member(upb_json_parser *p);
static bool end_membername(upb_json_parser *p);
static void start_any_member(upb_json_parser *p, const char *ptr);
static void end_any_member(upb_json_parser *p, const char *ptr);
static bool end_any_membername(upb_json_parser *p);
size_t parse(void *closure, const void *hd, const char *buf, size_t size,
const upb_bufhandle *handle);
static bool end(void *closure, const void *hd);
static const char eof_ch = 'e';
/* stringsink */
typedef struct {
upb_byteshandler handler;
upb_bytessink sink;
char *ptr;
size_t len, size;
} upb_stringsink;
static void *stringsink_start(void *_sink, const void *hd, size_t size_hint) {
upb_stringsink *sink = _sink;
sink->len = 0;
UPB_UNUSED(hd);
UPB_UNUSED(size_hint);
return sink;
}
static size_t stringsink_string(void *_sink, const void *hd, const char *ptr,
size_t len, const upb_bufhandle *handle) {
upb_stringsink *sink = _sink;
size_t new_size = sink->size;
UPB_UNUSED(hd);
UPB_UNUSED(handle);
while (sink->len + len > new_size) {
new_size *= 2;
}
if (new_size != sink->size) {
sink->ptr = realloc(sink->ptr, new_size);
sink->size = new_size;
}
memcpy(sink->ptr + sink->len, ptr, len);
sink->len += len;
return len;
}
void upb_stringsink_init(upb_stringsink *sink) {
upb_byteshandler_init(&sink->handler);
upb_byteshandler_setstartstr(&sink->handler, stringsink_start, NULL);
upb_byteshandler_setstring(&sink->handler, stringsink_string, NULL);
upb_bytessink_reset(&sink->sink, &sink->handler, sink);
sink->size = 32;
sink->ptr = malloc(sink->size);
sink->len = 0;
}
void upb_stringsink_uninit(upb_stringsink *sink) { free(sink->ptr); }
typedef struct {
/* For encoding Any value field in binary format. */
upb_handlercache *encoder_handlercache;
upb_stringsink stringsink;
/* For decoding Any value field in json format. */
upb_json_codecache *parser_codecache;
upb_sink sink;
upb_json_parser *parser;
/* Mark the range of uninterpreted values in json input before type url. */
const char *before_type_url_start;
const char *before_type_url_end;
/* Mark the range of uninterpreted values in json input after type url. */
const char *after_type_url_start;
} upb_jsonparser_any_frame;
typedef struct {
upb_sink sink;
/* The current message in which we're parsing, and the field whose value we're
* expecting next. */
const upb_msgdef *m;
const upb_fielddef *f;
/* The table mapping json name to fielddef for this message. */
const upb_strtable *name_table;
/* We are in a repeated-field context. We need this flag to decide whether to
* handle the array as a normal repeated field or a
* google.protobuf.ListValue/google.protobuf.Value. */
bool is_repeated;
/* We are in a repeated-field context, ready to emit mapentries as
* submessages. This flag alters the start-of-object (open-brace) behavior to
* begin a sequence of mapentry messages rather than a single submessage. */
bool is_map;
/* We are in a map-entry message context. This flag is set when parsing the
* value field of a single map entry and indicates to all value-field parsers
* (subobjects, strings, numbers, and bools) that the map-entry submessage
* should end as soon as the value is parsed. */
bool is_mapentry;
/* If |is_map| or |is_mapentry| is true, |mapfield| refers to the parent
* message's map field that we're currently parsing. This differs from |f|
* because |f| is the field in the *current* message (i.e., the map-entry
* message itself), not the parent's field that leads to this map. */
const upb_fielddef *mapfield;
/* We are in an Any message context. This flag is set when parsing the Any
* message and indicates to all field parsers (subobjects, strings, numbers,
* and bools) that the parsed field should be serialized as binary data or
* cached (type url not found yet). */
bool is_any;
/* The type of packed message in Any. */
upb_jsonparser_any_frame *any_frame;
/* True if the field to be parsed is unknown. */
bool is_unknown_field;
} upb_jsonparser_frame;
static void init_frame(upb_jsonparser_frame* frame) {
frame->m = NULL;
frame->f = NULL;
frame->name_table = NULL;
frame->is_repeated = false;
frame->is_map = false;
frame->is_mapentry = false;
frame->mapfield = NULL;
frame->is_any = false;
frame->any_frame = NULL;
frame->is_unknown_field = false;
}
struct upb_json_parser {
upb_arena *arena;
const upb_json_parsermethod *method;
upb_bytessink input_;
/* Stack to track the JSON scopes we are in. */
upb_jsonparser_frame stack[UPB_JSON_MAX_DEPTH];
upb_jsonparser_frame *top;
upb_jsonparser_frame *limit;
upb_status *status;
/* Ragel's internal parsing stack for the parsing state machine. */
int current_state;
int parser_stack[UPB_JSON_MAX_DEPTH];
int parser_top;
/* The handle for the current buffer. */
const upb_bufhandle *handle;
/* Accumulate buffer. See details in parser.rl. */
const char *accumulated;
size_t accumulated_len;
char *accumulate_buf;
size_t accumulate_buf_size;
/* Multi-part text data. See details in parser.rl. */
int multipart_state;
upb_selector_t string_selector;
/* Input capture. See details in parser.rl. */
const char *capture;
/* Intermediate result of parsing a unicode escape sequence. */
uint32_t digit;
/* For resolve type url in Any. */
const upb_symtab *symtab;
/* Whether to proceed if unknown field is met. */
bool ignore_json_unknown;
/* Cache for parsing timestamp due to base and zone are handled in different
* handlers. */
struct tm tm;
};
static upb_jsonparser_frame* start_jsonparser_frame(upb_json_parser *p) {
upb_jsonparser_frame *inner;
inner = p->top + 1;
init_frame(inner);
return inner;
}
struct upb_json_codecache {
upb_arena *arena;
upb_inttable methods; /* upb_msgdef* -> upb_json_parsermethod* */
};
struct upb_json_parsermethod {
const upb_json_codecache *cache;
upb_byteshandler input_handler_;
/* Maps json_name -> fielddef */
upb_strtable name_table;
};
#define PARSER_CHECK_RETURN(x) if (!(x)) return false
static upb_jsonparser_any_frame *json_parser_any_frame_new(
upb_json_parser *p) {
upb_jsonparser_any_frame *frame;
frame = upb_arena_malloc(p->arena, sizeof(upb_jsonparser_any_frame));
frame->encoder_handlercache = upb_pb_encoder_newcache();
frame->parser_codecache = upb_json_codecache_new();
frame->parser = NULL;
frame->before_type_url_start = NULL;
frame->before_type_url_end = NULL;
frame->after_type_url_start = NULL;
upb_stringsink_init(&frame->stringsink);
return frame;
}
static void json_parser_any_frame_set_payload_type(
upb_json_parser *p,
upb_jsonparser_any_frame *frame,
const upb_msgdef *payload_type) {
const upb_handlers *h;
const upb_json_parsermethod *parser_method;
upb_pb_encoder *encoder;
/* Initialize encoder. */
h = upb_handlercache_get(frame->encoder_handlercache, payload_type);
encoder = upb_pb_encoder_create(p->arena, h, frame->stringsink.sink);
/* Initialize parser. */
parser_method = upb_json_codecache_get(frame->parser_codecache, payload_type);
upb_sink_reset(&frame->sink, h, encoder);
frame->parser =
upb_json_parser_create(p->arena, parser_method, p->symtab, frame->sink,
p->status, p->ignore_json_unknown);
}
static void json_parser_any_frame_free(upb_jsonparser_any_frame *frame) {
upb_handlercache_free(frame->encoder_handlercache);
upb_json_codecache_free(frame->parser_codecache);
upb_stringsink_uninit(&frame->stringsink);
}
static bool json_parser_any_frame_has_type_url(
upb_jsonparser_any_frame *frame) {
return frame->parser != NULL;
}
static bool json_parser_any_frame_has_value_before_type_url(
upb_jsonparser_any_frame *frame) {
return frame->before_type_url_start != frame->before_type_url_end;
}
static bool json_parser_any_frame_has_value_after_type_url(
upb_jsonparser_any_frame *frame) {
return frame->after_type_url_start != NULL;
}
static bool json_parser_any_frame_has_value(
upb_jsonparser_any_frame *frame) {
return json_parser_any_frame_has_value_before_type_url(frame) ||
json_parser_any_frame_has_value_after_type_url(frame);
}
static void json_parser_any_frame_set_before_type_url_end(
upb_jsonparser_any_frame *frame,
const char *ptr) {
if (frame->parser == NULL) {
frame->before_type_url_end = ptr;
}
}
static void json_parser_any_frame_set_after_type_url_start_once(
upb_jsonparser_any_frame *frame,
const char *ptr) {
if (json_parser_any_frame_has_type_url(frame) &&
frame->after_type_url_start == NULL) {
frame->after_type_url_start = ptr;
}
}
/* Used to signal that a capture has been suspended. */
static char suspend_capture;
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_ASSUME(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 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 void set_name_table(upb_json_parser *p, upb_jsonparser_frame *frame) {
upb_value v;
const upb_json_codecache *cache = p->method->cache;
bool ok;
const upb_json_parsermethod *method;
ok = upb_inttable_lookupptr(&cache->methods, frame->m, &v);
UPB_ASSUME(ok);
method = upb_value_getconstptr(v);
frame->name_table = &method->name_table;
}
/* There are GCC/Clang built-ins for overflow checking which we could start
* using if there was any performance benefit to it. */
static bool checked_add(size_t a, size_t b, size_t *c) {
if (SIZE_MAX - a < b) return false;
*c = a + b;
return true;
}
static size_t saturating_multiply(size_t a, size_t b) {
/* size_t is unsigned, so this is defined behavior even on overflow. */
size_t ret = a * b;
if (b != 0 && ret / b != a) {
ret = SIZE_MAX;
}
return ret;
}
/* Base64 decoding ************************************************************/
/* TODO(haberman): make this streaming. */
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) {
uint32_t val;
char output[3];
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;
}
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;
}
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] == '=') {
uint32_t val;
char output;
/* Last group contains only two input bytes, one output byte. */
if (ptr[0] == '=' || ptr[1] == '=' || ptr[3] != '=') {
goto badpadding;
}
val = b64lookup(ptr[0]) << 18 |
b64lookup(ptr[1]) << 12;
UPB_ASSERT(!(val & 0x80000000));
output = val >> 16;
upb_sink_putstring(p->top->sink, sel, &output, 1, NULL);
return true;
} else {
uint32_t val;
char output[2];
/* Last group contains only three input bytes, two output bytes. */
if (ptr[0] == '=' || ptr[1] == '=' || ptr[2] == '=') {
goto badpadding;
}
val = b64lookup(ptr[0]) << 18 |
b64lookup(ptr[1]) << 12 |
b64lookup(ptr[2]) << 6;
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;
}
/* Accumulate buffer **********************************************************/
/* Functionality for accumulating a buffer.
*
* Some parts of the parser need an entire value as a contiguous string. For
* example, to look up a member name in a hash table, or to turn a string into
* a number, the relevant library routines need the input string to be in
* contiguous memory, even if the value spanned two or more buffers in the
* input. These routines handle that.
*
* In the common case we can just point to the input buffer to get this
* contiguous string and avoid any actual copy. So we optimistically begin
* this way. But there are a few cases where we must instead copy into a
* separate buffer:
*
* 1. The string was not contiguous in the input (it spanned buffers).
*
* 2. The string included escape sequences that need to be interpreted to get
* the true value in a contiguous buffer. */
static void assert_accumulate_empty(upb_json_parser *p) {
UPB_ASSERT(p->accumulated == NULL);
UPB_ASSERT(p->accumulated_len == 0);
}
static void accumulate_clear(upb_json_parser *p) {
p->accumulated = NULL;
p->accumulated_len = 0;
}
/* Used internally by accumulate_append(). */
static bool accumulate_realloc(upb_json_parser *p, size_t need) {
void *mem;
size_t old_size = p->accumulate_buf_size;
size_t new_size = UPB_MAX(old_size, 128);
while (new_size < need) {
new_size = saturating_multiply(new_size, 2);
}
mem = upb_arena_realloc(p->arena, p->accumulate_buf, old_size, new_size);
if (!mem) {
upb_status_seterrmsg(p->status, "Out of memory allocating buffer.");
return false;
}
p->accumulate_buf = mem;
p->accumulate_buf_size = new_size;
return true;
}
/* Logically appends the given data to the append buffer.
* If "can_alias" is true, we will try to avoid actually copying, but the buffer
* must be valid until the next accumulate_append() call (if any). */
static bool accumulate_append(upb_json_parser *p, const char *buf, size_t len,
bool can_alias) {
size_t need;
if (!p->accumulated && can_alias) {
p->accumulated = buf;
p->accumulated_len = len;
return true;
}
if (!checked_add(p->accumulated_len, len, &need)) {
upb_status_seterrmsg(p->status, "Integer overflow.");
return false;
}
if (need > p->accumulate_buf_size && !accumulate_realloc(p, need)) {
return false;
}
if (p->accumulated != p->accumulate_buf) {
memcpy(p->accumulate_buf, p->accumulated, p->accumulated_len);
p->accumulated = p->accumulate_buf;
}
memcpy(p->accumulate_buf + p->accumulated_len, buf, len);
p->accumulated_len += len;
return true;
}
/* Returns a pointer to the data accumulated since the last accumulate_clear()
* call, and writes the length to *len. This with point either to the input
* buffer or a temporary accumulate buffer. */
static const char *accumulate_getptr(upb_json_parser *p, size_t *len) {
UPB_ASSERT(p->accumulated);
*len = p->accumulated_len;
return p->accumulated;
}
/* Mult-part text data ********************************************************/
/* When we have text data in the input, it can often come in multiple segments.
* For example, there may be some raw string data followed by an escape
* sequence. The two segments are processed with different logic. Also buffer
* seams in the input can cause multiple segments.
*
* As we see segments, there are two main cases for how we want to process them:
*
* 1. we want to push the captured input directly to string handlers.
*
* 2. we need to accumulate all the parts into a contiguous buffer for further
* processing (field name lookup, string->number conversion, etc). */
/* This is the set of states for p->multipart_state. */
enum {
/* We are not currently processing multipart data. */
MULTIPART_INACTIVE = 0,
/* We are processing multipart data by accumulating it into a contiguous
* buffer. */
MULTIPART_ACCUMULATE = 1,
/* We are processing multipart data by pushing each part directly to the
* current string handlers. */
MULTIPART_PUSHEAGERLY = 2
};
/* Start a multi-part text value where we accumulate the data for processing at
* the end. */
static void multipart_startaccum(upb_json_parser *p) {
assert_accumulate_empty(p);
UPB_ASSERT(p->multipart_state == MULTIPART_INACTIVE);
p->multipart_state = MULTIPART_ACCUMULATE;
}
/* Start a multi-part text value where we immediately push text data to a string
* value with the given selector. */
static void multipart_start(upb_json_parser *p, upb_selector_t sel) {
assert_accumulate_empty(p);
UPB_ASSERT(p->multipart_state == MULTIPART_INACTIVE);
p->multipart_state = MULTIPART_PUSHEAGERLY;
p->string_selector = sel;
}
static bool multipart_text(upb_json_parser *p, const char *buf, size_t len,
bool can_alias) {
switch (p->multipart_state) {
case MULTIPART_INACTIVE:
upb_status_seterrmsg(
p->status, "Internal error: unexpected state MULTIPART_INACTIVE");
return false;
case MULTIPART_ACCUMULATE:
if (!accumulate_append(p, buf, len, can_alias)) {
return false;
}
break;
case MULTIPART_PUSHEAGERLY: {
const upb_bufhandle *handle = can_alias ? p->handle : NULL;
upb_sink_putstring(p->top->sink, p->string_selector, buf, len, handle);
break;
}
}
return true;
}
/* Note: this invalidates the accumulate buffer! Call only after reading its
* contents. */
static void multipart_end(upb_json_parser *p) {
UPB_ASSERT(p->multipart_state != MULTIPART_INACTIVE);
p->multipart_state = MULTIPART_INACTIVE;
accumulate_clear(p);
}
/* Input capture **************************************************************/
/* Functionality for capturing a region of the input as text. Gracefully
* handles the case where a buffer seam occurs in the middle of the captured
* region. */
static void capture_begin(upb_json_parser *p, const char *ptr) {
UPB_ASSERT(p->multipart_state != MULTIPART_INACTIVE);
UPB_ASSERT(p->capture == NULL);
p->capture = ptr;
}
static bool capture_end(upb_json_parser *p, const char *ptr) {
UPB_ASSERT(p->capture);
if (multipart_text(p, p->capture, ptr - p->capture, true)) {
p->capture = NULL;
return true;
} else {
return false;
}
}
/* This is called at the end of each input buffer (ie. when we have hit a
* buffer seam). If we are in the middle of capturing the input, this
* processes the unprocessed capture region. */
static void capture_suspend(upb_json_parser *p, const char **ptr) {
if (!p->capture) return;
if (multipart_text(p, p->capture, *ptr - p->capture, false)) {
/* We use this as a signal that we were in the middle of capturing, and
* that capturing should resume at the beginning of the next buffer.
*
* We can't use *ptr here, because we have no guarantee that this pointer
* will be valid when we resume (if the underlying memory is freed, then
* using the pointer at all, even to compare to NULL, is likely undefined
* behavior). */
p->capture = &suspend_capture;
} else {
/* Need to back up the pointer to the beginning of the capture, since
* we were not able to actually preserve it. */
*ptr = p->capture;
}
}
static void capture_resume(upb_json_parser *p, const char *ptr) {
if (p->capture) {
UPB_ASSERT(p->capture == &suspend_capture);
p->capture = ptr;
}
}
/* Callbacks from the parser **************************************************/
/* These are the functions called directly from the parser itself.
* We define these in the same order as their declarations in the parser. */
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:
UPB_ASSERT(0);
return 'x';
}
}
static bool escape(upb_json_parser *p, const char *ptr) {
char ch = escape_char(*ptr);
return multipart_text(p, &ch, 1, false);
}
static void start_hex(upb_json_parser *p) {
p->digit = 0;
}
static void hexdigit(upb_json_parser *p, const char *ptr) {
char ch = *ptr;
p->digit <<= 4;
if (ch >= '0' && ch <= '9') {
p->digit += (ch - '0');
} else if (ch >= 'a' && ch <= 'f') {
p->digit += ((ch - 'a') + 10);
} else {
UPB_ASSERT(ch >= 'A' && ch <= 'F');
p->digit += ((ch - 'A') + 10);
}
}
static bool end_hex(upb_json_parser *p) {
uint32_t codepoint = p->digit;
/* 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). */
return multipart_text(p, utf8, length, false);
}
static void start_text(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_text(upb_json_parser *p, const char *ptr) {
return capture_end(p, ptr);
}
static bool start_number(upb_json_parser *p, const char *ptr) {
if (is_top_level(p)) {
if (is_number_wrapper_object(p)) {
start_wrapper_object(p);
} else if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
start_value_object(p, VALUE_NUMBERVALUE);
} else {
return false;
}
} else if (does_number_wrapper_start(p)) {
if (!start_subobject(p)) {
return false;
}
start_wrapper_object(p);
} else if (is_wellknown_field(p, UPB_WELLKNOWN_VALUE)) {
if (!start_subobject(p)) {
return false;
}
start_value_object(p, VALUE_NUMBERVALUE);
}
multipart_startaccum(p);
capture_begin(p, ptr);
return true;
}
static bool parse_number(upb_json_parser *p, bool is_quoted);
static bool end_number_nontop(upb_json_parser *p, const char *ptr) {
if (!capture_end(p, ptr)) {
return false;
}
if (p->top->f == NULL) {
multipart_end(p);
return true;
}
return parse_number(p, false);
}
static bool end_number(upb_json_parser *p, const char *ptr) {
if (!end_number_nontop(p, ptr)) {
return false;
}
if (does_number_wrapper_end(p)) {
end_wrapper_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
end_value_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
return true;
}
/* |buf| is NULL-terminated. |buf| itself will never include quotes;
* |is_quoted| tells us whether this text originally appeared inside quotes. */
static bool parse_number_from_buffer(upb_json_parser *p, const char *buf,
bool is_quoted) {
size_t len = strlen(buf);
const char *bufend = buf + len;
char *end;
upb_fieldtype_t type = upb_fielddef_type(p->top->f);
double val;
double dummy;
double inf = UPB_INFINITY;
errno = 0;
if (len == 0 || buf[0] == ' ') {
return false;
}
/* For integer types, first try parsing with integer-specific routines.
* If these succeed, they will be more accurate for int64/uint64 than
* strtod().
*/
switch (type) {
case UPB_TYPE_ENUM:
case UPB_TYPE_INT32: {
long val = strtol(buf, &end, 0);
if (errno == ERANGE || end != bufend) {
break;
} else if (val > INT32_MAX || val < INT32_MIN) {
return false;
} else {
upb_sink_putint32(p->top->sink, parser_getsel(p), val);
return true;
}
}
case UPB_TYPE_UINT32: {
unsigned long val = strtoul(buf, &end, 0);
if (end != bufend) {
break;
} else if (val > UINT32_MAX || errno == ERANGE) {
return false;
} else {
upb_sink_putuint32(p->top->sink, parser_getsel(p), val);
return true;
}
}
/* XXX: We can't handle [u]int64 properly on 32-bit machines because
* strto[u]ll isn't in C89. */
case UPB_TYPE_INT64: {
long val = strtol(buf, &end, 0);
if (errno == ERANGE || end != bufend) {
break;
} else {
upb_sink_putint64(p->top->sink, parser_getsel(p), val);
return true;
}
}
case UPB_TYPE_UINT64: {
unsigned long val = strtoul(p->accumulated, &end, 0);
if (end != bufend) {
break;
} else if (errno == ERANGE) {
return false;
} else {
upb_sink_putuint64(p->top->sink, parser_getsel(p), val);
return true;
}
}
default:
break;
}
if (type != UPB_TYPE_DOUBLE && type != UPB_TYPE_FLOAT && is_quoted) {
/* Quoted numbers for integer types are not allowed to be in double form. */
return false;
}
if (len == strlen("Infinity") && strcmp(buf, "Infinity") == 0) {
/* C89 does not have an INFINITY macro. */
val = inf;
} else if (len == strlen("-Infinity") && strcmp(buf, "-Infinity") == 0) {
val = -inf;
} else {
val = strtod(buf, &end);
if (errno == ERANGE || end != bufend) {
return false;
}
}
switch (type) {
#define CASE(capitaltype, smalltype, ctype, min, max) \
case UPB_TYPE_ ## capitaltype: { \
if (modf(val, &dummy) != 0 || val > max || val < min) { \
return false; \
} else { \
upb_sink_put ## smalltype(p->top->sink, parser_getsel(p), \
(ctype)val); \
return true; \
} \
break; \
}
case UPB_TYPE_ENUM:
CASE(INT32, int32, int32_t, INT32_MIN, INT32_MAX);
CASE(INT64, int64, int64_t, INT64_MIN, INT64_MAX);
CASE(UINT32, uint32, uint32_t, 0, UINT32_MAX);
CASE(UINT64, uint64, uint64_t, 0, UINT64_MAX);
#undef CASE
case UPB_TYPE_DOUBLE:
upb_sink_putdouble(p->top->sink, parser_getsel(p), val);
return true;
case UPB_TYPE_FLOAT:
if ((val > FLT_MAX || val < -FLT_MAX) && val != inf && val != -inf) {
return false;
} else {
upb_sink_putfloat(p->top->sink, parser_getsel(p), val);
return true;
}
default:
return false;
}
}
static bool parse_number(upb_json_parser *p, bool is_quoted) {
size_t len;
const char *buf;
/* strtol() and friends unfortunately do not support specifying the length of
* the input string, so we need to force a copy into a NULL-terminated buffer. */
if (!multipart_text(p, "\0", 1, false)) {
return false;
}
buf = accumulate_getptr(p, &len);
if (parse_number_from_buffer(p, buf, is_quoted)) {
multipart_end(p);
return true;
} else {
upb_status_seterrf(p->status, "error parsing number: %s", buf);
multipart_end(p);
return false;
}
}
static bool parser_putbool(upb_json_parser *p, bool val) {
bool ok;
if (p->top->f == NULL) {
return true;
}
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;
}
ok = upb_sink_putbool(p->top->sink, parser_getsel(p), val);
UPB_ASSERT(ok);
return true;
}
static bool end_bool(upb_json_parser *p, bool val) {
if (is_top_level(p)) {
if (is_wellknown_msg(p, UPB_WELLKNOWN_BOOLVALUE)) {
start_wrapper_object(p);
} else if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
start_value_object(p, VALUE_BOOLVALUE);
} else {
return false;
}
} else if (is_wellknown_field(p, UPB_WELLKNOWN_BOOLVALUE)) {
if (!start_subobject(p)) {
return false;
}
start_wrapper_object(p);
} else if (is_wellknown_field(p, UPB_WELLKNOWN_VALUE)) {
if (!start_subobject(p)) {
return false;
}
start_value_object(p, VALUE_BOOLVALUE);
}
if (p->top->is_unknown_field) {
return true;
}
if (!parser_putbool(p, val)) {
return false;
}
if (is_wellknown_msg(p, UPB_WELLKNOWN_BOOLVALUE)) {
end_wrapper_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
end_value_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
return true;
}
static bool end_null(upb_json_parser *p) {
const char *zero_ptr = "0";
if (is_top_level(p)) {
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
start_value_object(p, VALUE_NULLVALUE);
} else {
return true;
}
} else if (is_wellknown_field(p, UPB_WELLKNOWN_VALUE)) {
if (!start_subobject(p)) {
return false;
}
start_value_object(p, VALUE_NULLVALUE);
} else {
return true;
}
/* Fill null_value field. */
multipart_startaccum(p);
capture_begin(p, zero_ptr);
capture_end(p, zero_ptr + 1);
parse_number(p, false);
end_value_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
static bool start_any_stringval(upb_json_parser *p) {
multipart_startaccum(p);
return true;
}
static bool start_stringval(upb_json_parser *p) {
if (is_top_level(p)) {
if (is_string_wrapper_object(p) ||
is_number_wrapper_object(p)) {
start_wrapper_object(p);
} else if (is_wellknown_msg(p, UPB_WELLKNOWN_FIELDMASK)) {
start_fieldmask_object(p);
return true;
} else if (is_wellknown_msg(p, UPB_WELLKNOWN_TIMESTAMP) ||
is_wellknown_msg(p, UPB_WELLKNOWN_DURATION)) {
start_object(p);
} else if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
start_value_object(p, VALUE_STRINGVALUE);
} else {
return false;
}
} else if (does_string_wrapper_start(p) ||
does_number_wrapper_start(p)) {
if (!start_subobject(p)) {
return false;
}
start_wrapper_object(p);
} else if (does_fieldmask_start(p)) {
if (!start_subobject(p)) {
return false;
}
start_fieldmask_object(p);
return true;
} else if (is_wellknown_field(p, UPB_WELLKNOWN_TIMESTAMP) ||
is_wellknown_field(p, UPB_WELLKNOWN_DURATION)) {
if (!start_subobject(p)) {
return false;
}
start_object(p);
} else if (is_wellknown_field(p, UPB_WELLKNOWN_VALUE)) {
if (!start_subobject(p)) {
return false;
}
start_value_object(p, VALUE_STRINGVALUE);
}
if (p->top->f == NULL) {
multipart_startaccum(p);
return true;
}
if (p->top->is_any) {
return start_any_stringval(p);
}
if (upb_fielddef_isstring(p->top->f)) {
upb_jsonparser_frame *inner;
upb_selector_t sel;
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. */
inner = start_jsonparser_frame(p);
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;
if (upb_fielddef_type(p->top->f) == UPB_TYPE_STRING) {
/* For STRING fields we push data directly to the handlers as it is
* parsed. We don't do this yet for BYTES fields, because our base64
* decoder is not streaming.
*
* TODO(haberman): make base64 decoding streaming also. */
multipart_start(p, getsel_for_handlertype(p, UPB_HANDLER_STRING));
return true;
} else {
multipart_startaccum(p);
return true;
}
} else if (upb_fielddef_type(p->top->f) != UPB_TYPE_BOOL &&
upb_fielddef_type(p->top->f) != UPB_TYPE_MESSAGE) {
/* No need to push a frame -- numeric values in quotes remain in the
* current parser frame. These values must accmulate so we can convert
* them all at once at the end. */
multipart_startaccum(p);
return true;
} else {
upb_status_seterrf(p->status,
"String specified for bool or submessage field: %s",
upb_fielddef_name(p->top->f));
return false;
}
}
static bool end_any_stringval(upb_json_parser *p) {
size_t len;
const char *buf = accumulate_getptr(p, &len);
/* Set type_url */
upb_selector_t sel;
upb_jsonparser_frame *inner;
if (!check_stack(p)) return false;
inner = p->top + 1;
sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSTR);
upb_sink_startstr(p->top->sink, sel, 0, &inner->sink);
sel = getsel_for_handlertype(p, UPB_HANDLER_STRING);
upb_sink_putstring(inner->sink, sel, buf, len, NULL);
sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
upb_sink_endstr(inner->sink, sel);
multipart_end(p);
/* Resolve type url */
if (strncmp(buf, "type.googleapis.com/", 20) == 0 && len > 20) {
const upb_msgdef *payload_type = NULL;
buf += 20;
len -= 20;
payload_type = upb_symtab_lookupmsg2(p->symtab, buf, len);
if (payload_type == NULL) {
upb_status_seterrf(
p->status, "Cannot find packed type: %.*s\n", (int)len, buf);
return false;
}
json_parser_any_frame_set_payload_type(p, p->top->any_frame, payload_type);
return true;
} else {
upb_status_seterrf(
p->status, "Invalid type url: %.*s\n", (int)len, buf);
return false;
}
}
static bool end_stringval_nontop(upb_json_parser *p) {
bool ok = true;
if (is_wellknown_msg(p, UPB_WELLKNOWN_TIMESTAMP) ||
is_wellknown_msg(p, UPB_WELLKNOWN_DURATION)) {
multipart_end(p);
return true;
}
if (p->top->f == NULL) {
multipart_end(p);
return true;
}
if (p->top->is_any) {
return end_any_stringval(p);
}
switch (upb_fielddef_type(p->top->f)) {
case UPB_TYPE_BYTES:
if (!base64_push(p, getsel_for_handlertype(p, UPB_HANDLER_STRING),
p->accumulated, p->accumulated_len)) {
return false;
}
/* Fall through. */
case UPB_TYPE_STRING: {
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
upb_sink_endstr(p->top->sink, sel);
p->top--;
break;
}
case UPB_TYPE_ENUM: {
/* Resolve enum symbolic name to integer value. */
const upb_enumdef *enumdef = upb_fielddef_enumsubdef(p->top->f);
size_t len;
const char *buf = accumulate_getptr(p, &len);
int32_t int_val = 0;
ok = upb_enumdef_ntoi(enumdef, buf, len, &int_val);
if (ok) {
upb_selector_t sel = parser_getsel(p);
upb_sink_putint32(p->top->sink, sel, int_val);
} else {
upb_status_seterrf(p->status, "Enum value unknown: '%.*s'", len, buf);
}
break;
}
case UPB_TYPE_INT32:
case UPB_TYPE_INT64:
case UPB_TYPE_UINT32:
case UPB_TYPE_UINT64:
case UPB_TYPE_DOUBLE:
case UPB_TYPE_FLOAT:
ok = parse_number(p, true);
break;
default:
UPB_ASSERT(false);
upb_status_seterrmsg(p->status, "Internal error in JSON decoder");
ok = false;
break;
}
multipart_end(p);
return ok;
}
static bool end_stringval(upb_json_parser *p) {
/* FieldMask's stringvals have been ended when handling them. Only need to
* close FieldMask here.*/
if (does_fieldmask_end(p)) {
end_fieldmask_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
if (!end_stringval_nontop(p)) {
return false;
}
if (does_string_wrapper_end(p) ||
does_number_wrapper_end(p)) {
end_wrapper_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
end_value_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
if (is_wellknown_msg(p, UPB_WELLKNOWN_TIMESTAMP) ||
is_wellknown_msg(p, UPB_WELLKNOWN_DURATION) ||
is_wellknown_msg(p, UPB_WELLKNOWN_FIELDMASK)) {
end_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
return true;
}
return true;
}
static void start_duration_base(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_duration_base(upb_json_parser *p, const char *ptr) {
size_t len;
const char *buf;
char seconds_buf[14];
char nanos_buf[12];
char *end;
int64_t seconds = 0;
int32_t nanos = 0;
double val = 0.0;
const char *seconds_membername = "seconds";
const char *nanos_membername = "nanos";
size_t fraction_start;
if (!capture_end(p, ptr)) {
return false;
}
buf = accumulate_getptr(p, &len);
memset(seconds_buf, 0, 14);
memset(nanos_buf, 0, 12);
/* Find out base end. The maximus duration is 315576000000, which cannot be
* represented by double without losing precision. Thus, we need to handle
* fraction and base separately. */
for (fraction_start = 0; fraction_start < len && buf[fraction_start] != '.';
fraction_start++);
/* Parse base */
memcpy(seconds_buf, buf, fraction_start);
seconds = strtol(seconds_buf, &end, 10);
if (errno == ERANGE || end != seconds_buf + fraction_start) {
upb_status_seterrf(p->status, "error parsing duration: %s",
seconds_buf);
return false;
}
if (seconds > 315576000000) {
upb_status_seterrf(p->status, "error parsing duration: "
"maximum acceptable value is "
"315576000000");
return false;
}
if (seconds < -315576000000) {
upb_status_seterrf(p->status, "error parsing duration: "
"minimum acceptable value is "
"-315576000000");
return false;
}
/* Parse fraction */
nanos_buf[0] = '0';
memcpy(nanos_buf + 1, buf + fraction_start, len - fraction_start);
val = strtod(nanos_buf, &end);
if (errno == ERANGE || end != nanos_buf + len - fraction_start + 1) {
upb_status_seterrf(p->status, "error parsing duration: %s",
nanos_buf);
return false;
}
nanos = val * 1000000000;
if (seconds < 0) nanos = -nanos;
/* Clean up buffer */
multipart_end(p);
/* Set seconds */
start_member(p);
capture_begin(p, seconds_membername);
capture_end(p, seconds_membername + 7);
end_membername(p);
upb_sink_putint64(p->top->sink, parser_getsel(p), seconds);
end_member(p);
/* Set nanos */
start_member(p);
capture_begin(p, nanos_membername);
capture_end(p, nanos_membername + 5);
end_membername(p);
upb_sink_putint32(p->top->sink, parser_getsel(p), nanos);
end_member(p);
/* Continue previous arena */
multipart_startaccum(p);
return true;
}
static int parse_timestamp_number(upb_json_parser *p) {
size_t len;
const char *buf;
int val;
/* atoi() and friends unfortunately do not support specifying the length of
* the input string, so we need to force a copy into a NULL-terminated buffer. */
multipart_text(p, "\0", 1, false);
buf = accumulate_getptr(p, &len);
val = atoi(buf);
multipart_end(p);
multipart_startaccum(p);
return val;
}
static void start_year(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_year(upb_json_parser *p, const char *ptr) {
if (!capture_end(p, ptr)) {
return false;
}
p->tm.tm_year = parse_timestamp_number(p) - 1900;
return true;
}
static void start_month(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_month(upb_json_parser *p, const char *ptr) {
if (!capture_end(p, ptr)) {
return false;
}
p->tm.tm_mon = parse_timestamp_number(p) - 1;
return true;
}
static void start_day(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_day(upb_json_parser *p, const char *ptr) {
if (!capture_end(p, ptr)) {
return false;
}
p->tm.tm_mday = parse_timestamp_number(p);
return true;
}
static void start_hour(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_hour(upb_json_parser *p, const char *ptr) {
if (!capture_end(p, ptr)) {
return false;
}
p->tm.tm_hour = parse_timestamp_number(p);
return true;
}
static void start_minute(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_minute(upb_json_parser *p, const char *ptr) {
if (!capture_end(p, ptr)) {
return false;
}
p->tm.tm_min = parse_timestamp_number(p);
return true;
}
static void start_second(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_second(upb_json_parser *p, const char *ptr) {
if (!capture_end(p, ptr)) {
return false;
}
p->tm.tm_sec = parse_timestamp_number(p);
return true;
}
static void start_timestamp_base(upb_json_parser *p) {
memset(&p->tm, 0, sizeof(struct tm));
}
static void start_timestamp_fraction(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_timestamp_fraction(upb_json_parser *p, const char *ptr) {
size_t len;
const char *buf;
char nanos_buf[12];
char *end;
double val = 0.0;
int32_t nanos;
const char *nanos_membername = "nanos";
memset(nanos_buf, 0, 12);
if (!capture_end(p, ptr)) {
return false;
}
buf = accumulate_getptr(p, &len);
if (len > 10) {
upb_status_seterrf(p->status,
"error parsing timestamp: at most 9-digit fraction.");
return false;
}
/* Parse nanos */
nanos_buf[0] = '0';
memcpy(nanos_buf + 1, buf, len);
val = strtod(nanos_buf, &end);
if (errno == ERANGE || end != nanos_buf + len + 1) {
upb_status_seterrf(p->status, "error parsing timestamp nanos: %s",
nanos_buf);
return false;
}
nanos = val * 1000000000;
/* Clean up previous environment */
multipart_end(p);
/* Set nanos */
start_member(p);
capture_begin(p, nanos_membername);
capture_end(p, nanos_membername + 5);
end_membername(p);
upb_sink_putint32(p->top->sink, parser_getsel(p), nanos);
end_member(p);
/* Continue previous environment */
multipart_startaccum(p);
return true;
}
static void start_timestamp_zone(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static int div_round_up2(int n, int d) {
return (n + d - 1) / d;
}
/* epoch_days(1970, 1, 1) == 1970-01-01 == 0. */
static int epoch_days(int year, int month, int day) {
static const uint16_t month_yday[12] = {0, 31, 59, 90, 120, 151,
181, 212, 243, 273, 304, 334};
int febs_since_0 = month > 2 ? year + 1 : year;
int leap_days_since_0 = div_round_up2(febs_since_0, 4) -
div_round_up2(febs_since_0, 100) +
div_round_up2(febs_since_0, 400);
int days_since_0 =
365 * year + month_yday[month - 1] + (day - 1) + leap_days_since_0;
/* Convert from 0-epoch (0001-01-01 BC) to Unix Epoch (1970-01-01 AD).
* Since the "BC" system does not have a year zero, 1 BC == year zero. */
return days_since_0 - 719528;
}
static int64_t upb_timegm(const struct tm *tp) {
int64_t ret = epoch_days(tp->tm_year + 1900, tp->tm_mon + 1, tp->tm_mday);
ret = (ret * 24) + tp->tm_hour;
ret = (ret * 60) + tp->tm_min;
ret = (ret * 60) + tp->tm_sec;
return ret;
}
static bool end_timestamp_zone(upb_json_parser *p, const char *ptr) {
size_t len;
const char *buf;
int hours;
int64_t seconds;
const char *seconds_membername = "seconds";
if (!capture_end(p, ptr)) {
return false;
}
buf = accumulate_getptr(p, &len);
if (buf[0] != 'Z') {
if (sscanf(buf + 1, "%2d:00", &hours) != 1) {
upb_status_seterrf(p->status, "error parsing timestamp offset");
return false;
}
if (buf[0] == '+') {
hours = -hours;
}
p->tm.tm_hour += hours;
}
/* Normalize tm */
seconds = upb_timegm(&p->tm);
/* Check timestamp boundary */
if (seconds < -62135596800) {
upb_status_seterrf(p->status, "error parsing timestamp: "
"minimum acceptable value is "
"0001-01-01T00:00:00Z");
return false;
}
/* Clean up previous environment */
multipart_end(p);
/* Set seconds */
start_member(p);
capture_begin(p, seconds_membername);
capture_end(p, seconds_membername + 7);
end_membername(p);
upb_sink_putint64(p->top->sink, parser_getsel(p), seconds);
end_member(p);
/* Continue previous environment */
multipart_startaccum(p);
return true;
}
static void start_fieldmask_path_text(upb_json_parser *p, const char *ptr) {
capture_begin(p, ptr);
}
static bool end_fieldmask_path_text(upb_json_parser *p, const char *ptr) {
return capture_end(p, ptr);
}
static bool start_fieldmask_path(upb_json_parser *p) {
upb_jsonparser_frame *inner;
upb_selector_t sel;
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. */
inner = start_jsonparser_frame(p);
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;
multipart_startaccum(p);
return true;
}
static bool lower_camel_push(
upb_json_parser *p, upb_selector_t sel, const char *ptr, size_t len) {
const char *limit = ptr + len;
bool first = true;
for (;ptr < limit; ptr++) {
if (*ptr >= 'A' && *ptr <= 'Z' && !first) {
char lower = tolower(*ptr);
upb_sink_putstring(p->top->sink, sel, "_", 1, NULL);
upb_sink_putstring(p->top->sink, sel, &lower, 1, NULL);
} else {
upb_sink_putstring(p->top->sink, sel, ptr, 1, NULL);
}
first = false;
}
return true;
}
static bool end_fieldmask_path(upb_json_parser *p) {
upb_selector_t sel;
if (!lower_camel_push(
p, getsel_for_handlertype(p, UPB_HANDLER_STRING),
p->accumulated, p->accumulated_len)) {
return false;
}
sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
upb_sink_endstr(p->top->sink, sel);
p->top--;
multipart_end(p);
return true;
}
static void start_member(upb_json_parser *p) {
UPB_ASSERT(!p->top->f);
multipart_startaccum(p);
}
/* Helper: invoked during parse_mapentry() to emit the mapentry message's key
* field based on the current contents of the accumulate buffer. */
static bool parse_mapentry_key(upb_json_parser *p) {
size_t len;
const char *buf = accumulate_getptr(p, &len);
/* Emit the key field. We do a bit of ad-hoc parsing here because the
* parser state machine has already decided that this is a string field
* name, and we are reinterpreting it as some arbitrary key type. In
* particular, integer and bool keys are quoted, so we need to parse the
* quoted string contents here. */
p->top->f = upb_msgdef_itof(p->top->m, UPB_MAPENTRY_KEY);
if (p->top->f == NULL) {
upb_status_seterrmsg(p->status, "mapentry message has no key");
return false;
}
switch (upb_fielddef_type(p->top->f)) {
case UPB_TYPE_INT32:
case UPB_TYPE_INT64:
case UPB_TYPE_UINT32:
case UPB_TYPE_UINT64:
/* Invoke end_number. The accum buffer has the number's text already. */
if (!parse_number(p, true)) {
return false;
}
break;
case UPB_TYPE_BOOL:
if (len == 4 && !strncmp(buf, "true", 4)) {
if (!parser_putbool(p, true)) {
return false;
}
} else if (len == 5 && !strncmp(buf, "false", 5)) {
if (!parser_putbool(p, false)) {
return false;
}
} else {
upb_status_seterrmsg(p->status,
"Map bool key not 'true' or 'false'");
return false;
}
multipart_end(p);
break;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES: {
upb_sink subsink;
upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSTR);
upb_sink_startstr(p->top->sink, sel, len, &subsink);
sel = getsel_for_handlertype(p, UPB_HANDLER_STRING);
upb_sink_putstring(subsink, sel, buf, len, NULL);
sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
upb_sink_endstr(subsink, sel);
multipart_end(p);
break;
}
default:
upb_status_seterrmsg(p->status, "Invalid field type for map key");
return false;
}
return true;
}
/* Helper: emit one map entry (as a submessage in the map field sequence). This
* is invoked from end_membername(), at the end of the map entry's key string,
* with the map key in the accumulate buffer. It parses the key from that
* buffer, emits the handler calls to start the mapentry submessage (setting up
* its subframe in the process), and sets up state in the subframe so that the
* value parser (invoked next) will emit the mapentry's value field and then
* end the mapentry message. */
static bool handle_mapentry(upb_json_parser *p) {
const upb_fielddef *mapfield;
const upb_msgdef *mapentrymsg;
upb_jsonparser_frame *inner;
upb_selector_t sel;
/* Map entry: p->top->sink is the seq frame, so we need to start a frame
* for the mapentry itself, and then set |f| in that frame so that the map
* value field is parsed, and also set a flag to end the frame after the
* map-entry value is parsed. */
if (!check_stack(p)) return false;
mapfield = p->top->mapfield;
mapentrymsg = upb_fielddef_msgsubdef(mapfield);
inner = start_jsonparser_frame(p);
p->top->f = mapfield;
sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSUBMSG);
upb_sink_startsubmsg(p->top->sink, sel, &inner->sink);
inner->m = mapentrymsg;
inner->mapfield = mapfield;
/* Don't set this to true *yet* -- we reuse parsing handlers below to push
* the key field value to the sink, and these handlers will pop the frame
* if they see is_mapentry (when invoked by the parser state machine, they
* would have just seen the map-entry value, not key). */
inner->is_mapentry = false;
p->top = inner;
/* send STARTMSG in submsg frame. */
upb_sink_startmsg(p->top->sink);
parse_mapentry_key(p);
/* Set up the value field to receive the map-entry value. */
p->top->f = upb_msgdef_itof(p->top->m, UPB_MAPENTRY_VALUE);
p->top->is_mapentry = true; /* set up to pop frame after value is parsed. */
p->top->mapfield = mapfield;
if (p->top->f == NULL) {
upb_status_seterrmsg(p->status, "mapentry message has no value");
return false;
}
return true;
}
static bool end_membername(upb_json_parser *p) {
UPB_ASSERT(!p->top->f);
if (!p->top->m) {
p->top->is_unknown_field = true;
multipart_end(p);
return true;
}
if (p->top->is_any) {
return end_any_membername(p);
} else if (p->top->is_map) {
return handle_mapentry(p);
} else {
size_t len;
const char *buf = accumulate_getptr(p, &len);
upb_value v;
if (upb_strtable_lookup2(p->top->name_table, buf, len, &v)) {
p->top->f = upb_value_getconstptr(v);
multipart_end(p);
return true;
} else if (p->ignore_json_unknown) {
p->top->is_unknown_field = true;
multipart_end(p);
return true;
} else {
upb_status_seterrf(p->status, "No such field: %.*s\n", (int)len, buf);
return false;
}
}
}
static bool end_any_membername(upb_json_parser *p) {
size_t len;
const char *buf = accumulate_getptr(p, &len);
upb_value v;
if (len == 5 && strncmp(buf, "@type", len) == 0) {
upb_strtable_lookup2(p->top->name_table, "type_url", 8, &v);
p->top->f = upb_value_getconstptr(v);
multipart_end(p);
return true;
} else {
p->top->is_unknown_field = true;
multipart_end(p);
return true;
}
}
static void end_member(upb_json_parser *p) {
/* If we just parsed a map-entry value, end that frame too. */
if (p->top->is_mapentry) {
upb_selector_t sel;
bool ok;
const upb_fielddef *mapfield;
UPB_ASSERT(p->top > p->stack);
/* send ENDMSG on submsg. */
upb_sink_endmsg(p->top->sink, p->status);
mapfield = p->top->mapfield;
/* send ENDSUBMSG in repeated-field-of-mapentries frame. */
p->top--;
ok = upb_handlers_getselector(mapfield, UPB_HANDLER_ENDSUBMSG, &sel);
UPB_ASSUME(ok);
upb_sink_endsubmsg(p->top->sink, (p->top + 1)->sink, sel);
}
p->top->f = NULL;
p->top->is_unknown_field = false;
}
static void start_any_member(upb_json_parser *p, const char *ptr) {
start_member(p);
json_parser_any_frame_set_after_type_url_start_once(p->top->any_frame, ptr);
}
static void end_any_member(upb_json_parser *p, const char *ptr) {
json_parser_any_frame_set_before_type_url_end(p->top->any_frame, ptr);
end_member(p);
}
static bool start_subobject(upb_json_parser *p) {
if (p->top->is_unknown_field) {
if (!check_stack(p)) return false;
p->top = start_jsonparser_frame(p);
return true;
}
if (upb_fielddef_ismap(p->top->f)) {
upb_jsonparser_frame *inner;
upb_selector_t sel;
/* Beginning of a map. Start a new parser frame in a repeated-field
* context. */
if (!check_stack(p)) return false;
inner = start_jsonparser_frame(p);
sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSEQ);
upb_sink_startseq(p->top->sink, sel, &inner->sink);
inner->m = upb_fielddef_msgsubdef(p->top->f);
inner->mapfield = p->top->f;
inner->is_map = true;
p->top = inner;
return true;
} else if (upb_fielddef_issubmsg(p->top->f)) {
upb_jsonparser_frame *inner;
upb_selector_t sel;
/* Beginning of a subobject. Start a new parser frame in the submsg
* context. */
if (!check_stack(p)) return false;
inner = start_jsonparser_frame(p);
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);
set_name_table(p, inner);
p->top = inner;
if (is_wellknown_msg(p, UPB_WELLKNOWN_ANY)) {
p->top->is_any = true;
p->top->any_frame = json_parser_any_frame_new(p);
} else {
p->top->is_any = false;
p->top->any_frame = NULL;
}
return true;
} else {
upb_status_seterrf(p->status,
"Object specified for non-message/group field: %s",
upb_fielddef_name(p->top->f));
return false;
}
}
static bool start_subobject_full(upb_json_parser *p) {
if (is_top_level(p)) {
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
start_value_object(p, VALUE_STRUCTVALUE);
if (!start_subobject(p)) return false;
start_structvalue_object(p);
} else if (is_wellknown_msg(p, UPB_WELLKNOWN_STRUCT)) {
start_structvalue_object(p);
} else {
return true;
}
} else if (is_wellknown_field(p, UPB_WELLKNOWN_STRUCT)) {
if (!start_subobject(p)) return false;
start_structvalue_object(p);
} else if (is_wellknown_field(p, UPB_WELLKNOWN_VALUE)) {
if (!start_subobject(p)) return false;
start_value_object(p, VALUE_STRUCTVALUE);
if (!start_subobject(p)) return false;
start_structvalue_object(p);
}
return start_subobject(p);
}
static void end_subobject(upb_json_parser *p) {
if (is_top_level(p)) {
return;
}
if (p->top->is_map) {
upb_selector_t sel;
p->top--;
sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSEQ);
upb_sink_endseq(p->top->sink, sel);
} else {
upb_selector_t sel;
bool is_unknown = p->top->m == NULL;
p->top--;
if (!is_unknown) {
sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSUBMSG);
upb_sink_endsubmsg(p->top->sink, (p->top + 1)->sink, sel);
}
}
}
static void end_subobject_full(upb_json_parser *p) {
end_subobject(p);
if (is_wellknown_msg(p, UPB_WELLKNOWN_STRUCT)) {
end_structvalue_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
}
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
end_value_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
}
}
static bool start_array(upb_json_parser *p) {
upb_jsonparser_frame *inner;
upb_selector_t sel;
if (is_top_level(p)) {
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
start_value_object(p, VALUE_LISTVALUE);
if (!start_subobject(p)) return false;
start_listvalue_object(p);
} else if (is_wellknown_msg(p, UPB_WELLKNOWN_LISTVALUE)) {
start_listvalue_object(p);
} else {
return false;
}
} else if (is_wellknown_field(p, UPB_WELLKNOWN_LISTVALUE) &&
(!upb_fielddef_isseq(p->top->f) ||
p->top->is_repeated)) {
if (!start_subobject(p)) return false;
start_listvalue_object(p);
} else if (is_wellknown_field(p, UPB_WELLKNOWN_VALUE) &&
(!upb_fielddef_isseq(p->top->f) ||
p->top->is_repeated)) {
if (!start_subobject(p)) return false;
start_value_object(p, VALUE_LISTVALUE);
if (!start_subobject(p)) return false;
start_listvalue_object(p);
}
if (p->top->is_unknown_field) {
inner = start_jsonparser_frame(p);
inner->is_unknown_field = true;
p->top = inner;
return true;
}
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;
inner = start_jsonparser_frame(p);
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;
inner->is_repeated = true;
p->top = inner;
return true;
}
static void end_array(upb_json_parser *p) {
upb_selector_t sel;
UPB_ASSERT(p->top > p->stack);
p->top--;
if (p->top->is_unknown_field) {
return;
}
sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSEQ);
upb_sink_endseq(p->top->sink, sel);
if (is_wellknown_msg(p, UPB_WELLKNOWN_LISTVALUE)) {
end_listvalue_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
}
if (is_wellknown_msg(p, UPB_WELLKNOWN_VALUE)) {
end_value_object(p);
if (!is_top_level(p)) {
end_subobject(p);
}
}
}
static void start_object(upb_json_parser *p) {
if (!p->top->is_map && p->top->m != NULL) {
upb_sink_startmsg(p->top->sink);
}
}
static void end_object(upb_json_parser *p) {
if (!p->top->is_map && p->top->m != NULL) {
upb_sink_endmsg(p->top->sink, p->status);
}
}
static void start_any_object(upb_json_parser *p, const char *ptr) {
start_object(p);
p->top->any_frame->before_type_url_start = ptr;
p->top->any_frame->before_type_url_end = ptr;
}
static bool end_any_object(upb_json_parser *p, const char *ptr) {
const char *value_membername = "value";
bool is_well_known_packed = false;
const char *packed_end = ptr + 1;
upb_selector_t sel;
upb_jsonparser_frame *inner;
if (json_parser_any_frame_has_value(p->top->any_frame) &&
!json_parser_any_frame_has_type_url(p->top->any_frame)) {
upb_status_seterrmsg(p->status, "No valid type url");
return false;
}
/* Well known types data is represented as value field. */
if (upb_msgdef_wellknowntype(p->top->any_frame->parser->top->m) !=
UPB_WELLKNOWN_UNSPECIFIED) {
is_well_known_packed = true;
if (json_parser_any_frame_has_value_before_type_url(p->top->any_frame)) {
p->top->any_frame->before_type_url_start =
memchr(p->top->any_frame->before_type_url_start, ':',
p->top->any_frame->before_type_url_end -
p->top->any_frame->before_type_url_start);
if (p->top->any_frame->before_type_url_start == NULL) {
upb_status_seterrmsg(p->status, "invalid data for well known type.");
return false;
}
p->top->any_frame->before_type_url_start++;
}
if (json_parser_any_frame_has_value_after_type_url(p->top->any_frame)) {
p->top->any_frame->after_type_url_start =
memchr(p->top->any_frame->after_type_url_start, ':',
(ptr + 1) -
p->top->any_frame->after_type_url_start);
if (p->top->any_frame->after_type_url_start == NULL) {
upb_status_seterrmsg(p->status, "Invalid data for well known type.");
return false;
}
p->top->any_frame->after_type_url_start++;
packed_end = ptr;
}
}
if (json_parser_any_frame_has_value_before_type_url(p->top->any_frame)) {
if (!parse(p->top->any_frame->parser, NULL,
p->top->any_frame->before_type_url_start,
p->top->any_frame->before_type_url_end -
p->top->any_frame->before_type_url_start, NULL)) {
return false;
}
} else {
if (!is_well_known_packed) {
if (!parse(p->top->any_frame->parser, NULL, "{", 1, NULL)) {
return false;
}
}
}
if (json_parser_any_frame_has_value_before_type_url(p->top->any_frame) &&
json_parser_any_frame_has_value_after_type_url(p->top->any_frame)) {
if (!parse(p->top->any_frame->parser, NULL, ",", 1, NULL)) {
return false;
}
}
if (json_parser_any_frame_has_value_after_type_url(p->top->any_frame)) {
if (!parse(p->top->any_frame->parser, NULL,
p->top->any_frame->after_type_url_start,
packed_end - p->top->any_frame->after_type_url_start, NULL)) {
return false;
}
} else {
if (!is_well_known_packed) {
if (!parse(p->top->any_frame->parser, NULL, "}", 1, NULL)) {
return false;
}
}
}
if (!end(p->top->any_frame->parser, NULL)) {
return false;
}
p->top->is_any = false;
/* Set value */
start_member(p);
capture_begin(p, value_membername);
capture_end(p, value_membername + 5);
end_membername(p);
if (!check_stack(p)) return false;
inner = p->top + 1;
sel = getsel_for_handlertype(p, UPB_HANDLER_STARTSTR);
upb_sink_startstr(p->top->sink, sel, 0, &inner->sink);
sel = getsel_for_handlertype(p, UPB_HANDLER_STRING);
upb_sink_putstring(inner->sink, sel, p->top->any_frame->stringsink.ptr,
p->top->any_frame->stringsink.len, NULL);
sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
upb_sink_endstr(inner->sink, sel);
end_member(p);
end_object(p);
/* Deallocate any parse frame. */
json_parser_any_frame_free(p->top->any_frame);
return true;
}
static bool is_string_wrapper(const upb_msgdef *m) {
upb_wellknowntype_t type = upb_msgdef_wellknowntype(m);
return type == UPB_WELLKNOWN_STRINGVALUE ||
type == UPB_WELLKNOWN_BYTESVALUE;
}
static bool is_fieldmask(const upb_msgdef *m) {
upb_wellknowntype_t type = upb_msgdef_wellknowntype(m);
return type == UPB_WELLKNOWN_FIELDMASK;
}
static void start_fieldmask_object(upb_json_parser *p) {
const char *membername = "paths";
start_object(p);
/* Set up context for parsing value */
start_member(p);
capture_begin(p, membername);
capture_end(p, membername + 5);
end_membername(p);
start_array(p);
}
static void end_fieldmask_object(upb_json_parser *p) {
end_array(p);
end_member(p);
end_object(p);
}
static void start_wrapper_object(upb_json_parser *p) {
const char *membername = "value";
start_object(p);
/* Set up context for parsing value */
start_member(p);
capture_begin(p, membername);
capture_end(p, membername + 5);
end_membername(p);
}
static void end_wrapper_object(upb_json_parser *p) {
end_member(p);
end_object(p);
}
static void start_value_object(upb_json_parser *p, int value_type) {
const char *nullmember = "null_value";
const char *numbermember = "number_value";
const char *stringmember = "string_value";
const char *boolmember = "bool_value";
const char *structmember = "struct_value";
const char *listmember = "list_value";
const char *membername = "";
switch (value_type) {
case VALUE_NULLVALUE:
membername = nullmember;
break;
case VALUE_NUMBERVALUE:
membername = numbermember;
break;
case VALUE_STRINGVALUE:
membername = stringmember;
break;
case VALUE_BOOLVALUE:
membername = boolmember;
break;
case VALUE_STRUCTVALUE:
membername = structmember;
break;
case VALUE_LISTVALUE:
membername = listmember;
break;
}
start_object(p);
/* Set up context for parsing value */
start_member(p);
capture_begin(p, membername);
capture_end(p, membername + strlen(membername));
end_membername(p);
}
static void end_value_object(upb_json_parser *p) {
end_member(p);
end_object(p);
}
static void start_listvalue_object(upb_json_parser *p) {
const char *membername = "values";
start_object(p);
/* Set up context for parsing value */
start_member(p);
capture_begin(p, membername);
capture_end(p, membername + strlen(membername));
end_membername(p);
}
static void end_listvalue_object(upb_json_parser *p) {
end_member(p);
end_object(p);
}
static void start_structvalue_object(upb_json_parser *p) {
const char *membername = "fields";
start_object(p);
/* Set up context for parsing value */
start_member(p);
capture_begin(p, membername);
capture_end(p, membername + strlen(membername));
end_membername(p);
}
static void end_structvalue_object(upb_json_parser *p) {
end_member(p);
end_object(p);
}
static bool is_top_level(upb_json_parser *p) {
return p->top == p->stack && p->top->f == NULL && !p->top->is_unknown_field;
}
static bool is_wellknown_msg(upb_json_parser *p, upb_wellknowntype_t type) {
return p->top->m != NULL && upb_msgdef_wellknowntype(p->top->m) == type;
}
static bool is_wellknown_field(upb_json_parser *p, upb_wellknowntype_t type) {
return p->top->f != NULL &&
upb_fielddef_issubmsg(p->top->f) &&
(upb_msgdef_wellknowntype(upb_fielddef_msgsubdef(p->top->f))
== type);
}
static bool does_number_wrapper_start(upb_json_parser *p) {
return p->top->f != NULL &&
upb_fielddef_issubmsg(p->top->f) &&
upb_msgdef_isnumberwrapper(upb_fielddef_msgsubdef(p->top->f));
}
static bool does_number_wrapper_end(upb_json_parser *p) {
return p->top->m != NULL && upb_msgdef_isnumberwrapper(p->top->m);
}
static bool is_number_wrapper_object(upb_json_parser *p) {
return p->top->m != NULL && upb_msgdef_isnumberwrapper(p->top->m);
}
static bool does_string_wrapper_start(upb_json_parser *p) {
return p->top->f != NULL &&
upb_fielddef_issubmsg(p->top->f) &&
is_string_wrapper(upb_fielddef_msgsubdef(p->top->f));
}
static bool does_string_wrapper_end(upb_json_parser *p) {
return p->top->m != NULL && is_string_wrapper(p->top->m);
}
static bool is_string_wrapper_object(upb_json_parser *p) {
return p->top->m != NULL && is_string_wrapper(p->top->m);
}
static bool does_fieldmask_start(upb_json_parser *p) {
return p->top->f != NULL &&
upb_fielddef_issubmsg(p->top->f) &&
is_fieldmask(upb_fielddef_msgsubdef(p->top->f));
}
static bool does_fieldmask_end(upb_json_parser *p) {
return p->top->m != NULL && is_fieldmask(p->top->m);
}
#define CHECK_RETURN_TOP(x) if (!(x)) goto error
/* The actual parser **********************************************************/
/* What follows is the Ragel parser itself. The language is specified in Ragel
* and the actions call our C functions above.
*
* Ragel has an extensive set of functionality, and we use only a small part of
* it. There are many action types but we only use a few:
*
* ">" -- transition into a machine
* "%" -- transition out of a machine
* "@" -- transition into a final state of a machine.
*
* "@" transitions are tricky because a machine can transition into a final
* state repeatedly. But in some cases we know this can't happen, for example
* a string which is delimited by a final '"' can only transition into its
* final state once, when the closing '"' is seen. */
%%{
machine json;
ws = space*;
integer = "0" | /[1-9]/ /[0-9]/*;
decimal = "." /[0-9]/+;
exponent = /[eE]/ /[+\-]/? /[0-9]/+;
number_machine :=
("-"? integer decimal? exponent?)
%/{ fhold; fret; }
<: any
>{ fhold; fret; }
;
number = /[0-9\-]/ >{ fhold; fcall number_machine; };
text =
/[^\\"]/+
>{ start_text(parser, p); }
%{ CHECK_RETURN_TOP(end_text(parser, p)); }
;
unicode_char =
"\\u"
/[0-9A-Fa-f]/{4}
>{ start_hex(parser); }
${ hexdigit(parser, p); }
%{ CHECK_RETURN_TOP(end_hex(parser)); }
;
escape_char =
"\\"
/[rtbfn"\/\\]/
>{ CHECK_RETURN_TOP(escape(parser, p)); }
;
string_machine :=
(text | unicode_char | escape_char)**
'"'
@{ fhold; fret; }
;
year =
(digit digit digit digit)
>{ start_year(parser, p); }
%{ CHECK_RETURN_TOP(end_year(parser, p)); }
;
month =
(digit digit)
>{ start_month(parser, p); }
%{ CHECK_RETURN_TOP(end_month(parser, p)); }
;
day =
(digit digit)
>{ start_day(parser, p); }
%{ CHECK_RETURN_TOP(end_day(parser, p)); }
;
hour =
(digit digit)
>{ start_hour(parser, p); }
%{ CHECK_RETURN_TOP(end_hour(parser, p)); }
;
minute =
(digit digit)
>{ start_minute(parser, p); }
%{ CHECK_RETURN_TOP(end_minute(parser, p)); }
;
second =
(digit digit)
>{ start_second(parser, p); }
%{ CHECK_RETURN_TOP(end_second(parser, p)); }
;
duration_machine :=
("-"? integer decimal?)
>{ start_duration_base(parser, p); }
%{ CHECK_RETURN_TOP(end_duration_base(parser, p)); }
's"'
@{ fhold; fret; }
;
timestamp_machine :=
(year "-" month "-" day "T" hour ":" minute ":" second)
>{ start_timestamp_base(parser); }
("." digit+)?
>{ start_timestamp_fraction(parser, p); }
%{ CHECK_RETURN_TOP(end_timestamp_fraction(parser, p)); }
([+\-] digit digit ":00" | "Z")
>{ start_timestamp_zone(parser, p); }
%{ CHECK_RETURN_TOP(end_timestamp_zone(parser, p)); }
'"'
@{ fhold; fret; }
;
fieldmask_path_text =
/[^",]/+
>{ start_fieldmask_path_text(parser, p); }
%{ end_fieldmask_path_text(parser, p); }
;
fieldmask_path =
fieldmask_path_text
>{ start_fieldmask_path(parser); }
%{ end_fieldmask_path(parser); }
;
fieldmask_machine :=
(fieldmask_path ("," fieldmask_path)*)?
'"'
@{ fhold; fret; }
;
string =
'"'
@{
if (is_wellknown_msg(parser, UPB_WELLKNOWN_TIMESTAMP)) {
fcall timestamp_machine;
} else if (is_wellknown_msg(parser, UPB_WELLKNOWN_DURATION)) {
fcall duration_machine;
} else if (is_wellknown_msg(parser, UPB_WELLKNOWN_FIELDMASK)) {
fcall fieldmask_machine;
} else {
fcall string_machine;
}
}
'"';
value2 = ^(space | "]" | "}") >{ fhold; fcall value_machine; } ;
member =
ws
string
>{
if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
start_any_member(parser, p);
} else {
start_member(parser);
}
}
@{ CHECK_RETURN_TOP(end_membername(parser)); }
ws ":" ws
value2
%{
if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
end_any_member(parser, p);
} else {
end_member(parser);
}
}
ws;
object =
("{" ws)
>{
if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
start_any_object(parser, p);
} else {
start_object(parser);
}
}
(member ("," member)*)?
"}"
>{
if (is_wellknown_msg(parser, UPB_WELLKNOWN_ANY)) {
CHECK_RETURN_TOP(end_any_object(parser, p));
} else {
end_object(parser);
}
}
;
element = ws value2 ws;
array =
"["
>{ CHECK_RETURN_TOP(start_array(parser)); }
ws
(element ("," element)*)?
"]"
>{ end_array(parser); }
;
value =
number
>{ CHECK_RETURN_TOP(start_number(parser, p)); }
%{ CHECK_RETURN_TOP(end_number(parser, p)); }
| string
>{ CHECK_RETURN_TOP(start_stringval(parser)); }
@{ CHECK_RETURN_TOP(end_stringval(parser)); }
| "true"
%{ CHECK_RETURN_TOP(end_bool(parser, true)); }
| "false"
%{ CHECK_RETURN_TOP(end_bool(parser, false)); }
| "null"
%{ CHECK_RETURN_TOP(end_null(parser)); }
| object
>{ CHECK_RETURN_TOP(start_subobject_full(parser)); }
%{ end_subobject_full(parser); }
| array;
value_machine :=
value
<: any >{ fhold; fret; } ;
main := ws value ws;
}%%
%% write data noerror nofinal;
size_t parse(void *closure, const void *hd, const char *buf, size_t size,
const upb_bufhandle *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;
const char *eof = &eof_ch;
parser->handle = handle;
UPB_UNUSED(hd);
UPB_UNUSED(handle);
capture_resume(parser, buf);
%% write exec;
if (p != pe) {
upb_status_seterrf(parser->status, "Parse error at '%.*s'\n", pe - p, p);
} else {
capture_suspend(parser, &p);
}
error:
/* Save parsing state back to parser. */
parser->current_state = cs;
parser->parser_top = top;
return p - buf;
}
static bool end(void *closure, const void *hd) {
upb_json_parser *parser = closure;
/* Prevent compile warning on unused static constants. */
UPB_UNUSED(json_start);
UPB_UNUSED(json_en_duration_machine);
UPB_UNUSED(json_en_fieldmask_machine);
UPB_UNUSED(json_en_number_machine);
UPB_UNUSED(json_en_string_machine);
UPB_UNUSED(json_en_timestamp_machine);
UPB_UNUSED(json_en_value_machine);
UPB_UNUSED(json_en_main);
parse(parser, hd, &eof_ch, 0, NULL);
return parser->current_state >= %%{ write first_final; }%%;
}
static void json_parser_reset(upb_json_parser *p) {
int cs;
int top;
p->top = p->stack;
init_frame(p->top);
/* Emit Ragel initialization of the parser. */
%% write init;
p->current_state = cs;
p->parser_top = top;
accumulate_clear(p);
p->multipart_state = MULTIPART_INACTIVE;
p->capture = NULL;
p->accumulated = NULL;
}
static upb_json_parsermethod *parsermethod_new(upb_json_codecache *c,
const upb_msgdef *md) {
upb_msg_field_iter i;
upb_alloc *alloc = upb_arena_alloc(c->arena);
upb_json_parsermethod *m = upb_malloc(alloc, sizeof(*m));
m->cache = c;
upb_byteshandler_init(&m->input_handler_);
upb_byteshandler_setstring(&m->input_handler_, parse, m);
upb_byteshandler_setendstr(&m->input_handler_, end, m);
upb_strtable_init2(&m->name_table, UPB_CTYPE_CONSTPTR, alloc);
/* Build name_table */
for(upb_msg_field_begin(&i, md);
!upb_msg_field_done(&i);
upb_msg_field_next(&i)) {
const upb_fielddef *f = upb_msg_iter_field(&i);
upb_value v = upb_value_constptr(f);
char *buf;
/* Add an entry for the JSON name. */
size_t len = upb_fielddef_getjsonname(f, NULL, 0);
buf = upb_malloc(alloc, len);
upb_fielddef_getjsonname(f, buf, len);
upb_strtable_insert3(&m->name_table, buf, strlen(buf), v, alloc);
if (strcmp(buf, upb_fielddef_name(f)) != 0) {
/* Since the JSON name is different from the regular field name, add an
* entry for the raw name (compliant proto3 JSON parsers must accept
* both). */
const char *name = upb_fielddef_name(f);
upb_strtable_insert3(&m->name_table, name, strlen(name), v, alloc);
}
}
return m;
}
/* Public API *****************************************************************/
upb_json_parser *upb_json_parser_create(upb_arena *arena,
const upb_json_parsermethod *method,
const upb_symtab* symtab,
upb_sink output,
upb_status *status,
bool ignore_json_unknown) {
#ifndef NDEBUG
const size_t size_before = upb_arena_bytesallocated(arena);
#endif
upb_json_parser *p = upb_arena_malloc(arena, sizeof(upb_json_parser));
if (!p) return false;
p->arena = arena;
p->method = method;
p->status = status;
p->limit = p->stack + UPB_JSON_MAX_DEPTH;
p->accumulate_buf = NULL;
p->accumulate_buf_size = 0;
upb_bytessink_reset(&p->input_, &method->input_handler_, p);
json_parser_reset(p);
p->top->sink = output;
p->top->m = upb_handlers_msgdef(output.handlers);
if (is_wellknown_msg(p, UPB_WELLKNOWN_ANY)) {
p->top->is_any = true;
p->top->any_frame = json_parser_any_frame_new(p);
} else {
p->top->is_any = false;
p->top->any_frame = NULL;
}
set_name_table(p, p->top);
p->symtab = symtab;
p->ignore_json_unknown = ignore_json_unknown;
/* If this fails, uncomment and increase the value in parser.h. */
/* fprintf(stderr, "%zd\n", upb_arena_bytesallocated(arena) - size_before); */
UPB_ASSERT_DEBUGVAR(upb_arena_bytesallocated(arena) - size_before <=
UPB_JSON_PARSER_SIZE);
return p;
}
upb_bytessink upb_json_parser_input(upb_json_parser *p) {
return p->input_;
}
const upb_byteshandler *upb_json_parsermethod_inputhandler(
const upb_json_parsermethod *m) {
return &m->input_handler_;
}
upb_json_codecache *upb_json_codecache_new(void) {
upb_alloc *alloc;
upb_json_codecache *c;
c = upb_gmalloc(sizeof(*c));
c->arena = upb_arena_new();
alloc = upb_arena_alloc(c->arena);
upb_inttable_init2(&c->methods, UPB_CTYPE_CONSTPTR, alloc);
return c;
}
void upb_json_codecache_free(upb_json_codecache *c) {
upb_arena_free(c->arena);
upb_gfree(c);
}
const upb_json_parsermethod *upb_json_codecache_get(upb_json_codecache *c,
const upb_msgdef *md) {
upb_json_parsermethod *m;
upb_value v;
upb_msg_field_iter i;
upb_alloc *alloc = upb_arena_alloc(c->arena);
if (upb_inttable_lookupptr(&c->methods, md, &v)) {
return upb_value_getconstptr(v);
}
m = parsermethod_new(c, md);
v = upb_value_constptr(m);
if (!m) return NULL;
if (!upb_inttable_insertptr2(&c->methods, md, v, alloc)) return NULL;
/* Populate parser methods for all submessages, so the name tables will
* be available during parsing. */
for(upb_msg_field_begin(&i, md);
!upb_msg_field_done(&i);
upb_msg_field_next(&i)) {
upb_fielddef *f = upb_msg_iter_field(&i);
if (upb_fielddef_issubmsg(f)) {
const upb_msgdef *subdef = upb_fielddef_msgsubdef(f);
const upb_json_parsermethod *sub_method =
upb_json_codecache_get(c, subdef);
if (!sub_method) return NULL;
}
}
return m;
}