diff options
Diffstat (limited to 'upb/json/parser.h')
-rw-r--r-- | upb/json/parser.h | 100 |
1 files changed, 17 insertions, 83 deletions
diff --git a/upb/json/parser.h b/upb/json/parser.h index c693edf..b932adf 100644 --- a/upb/json/parser.h +++ b/upb/json/parser.h @@ -11,6 +11,7 @@ #ifndef UPB_JSON_PARSER_H_ #define UPB_JSON_PARSER_H_ +#include "upb/env.h" #include "upb/sink.h" #ifdef __cplusplus @@ -23,96 +24,32 @@ class Parser; UPB_DECLARE_TYPE(upb::json::Parser, upb_json_parser); -// Internal-only struct used by the parser. A parser frame corresponds -// one-to-one with a handler (sink) frame. -typedef struct { - UPB_PRIVATE_FOR_CPP - 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; - - // 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; -} upb_jsonparser_frame; - - /* upb::json::Parser **********************************************************/ -#define UPB_JSON_MAX_DEPTH 64 +// Preallocation hint: parser won't allocate more bytes than this when first +// constructed. This hint may be an overestimate for some build configurations. +// But if the parser library is upgraded without recompiling the application, +// it may be an underestimate. +#define UPB_JSON_PARSER_SIZE 3568 + +#ifdef __cplusplus // Parses an incoming BytesStream, pushing the results to the destination sink. -UPB_DEFINE_CLASS0(upb::json::Parser, +class upb::json::Parser { public: - Parser(Status* status); - ~Parser(); + static Parser* Create(Environment* env, Sink* output); - // Resets the state of the printer, so that it will expect to begin a new - // document. - void Reset(); - - // Resets the output pointer which will serve as our closure. Implies - // Reset(). - void ResetOutput(Sink* output); - - // The input to the printer. BytesSink* input(); -, -UPB_DEFINE_STRUCT0(upb_json_parser, - upb_byteshandler input_handler_; - 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; + private: + UPB_DISALLOW_POD_OPS(Parser, upb::json::Parser); +}; - // 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; -)); +#endif UPB_BEGIN_EXTERN_C -void upb_json_parser_init(upb_json_parser *p, upb_status *status); -void upb_json_parser_uninit(upb_json_parser *p); -void upb_json_parser_reset(upb_json_parser *p); -void upb_json_parser_resetoutput(upb_json_parser *p, upb_sink *output); +upb_json_parser *upb_json_parser_create(upb_env *e, upb_sink *output); upb_bytessink *upb_json_parser_input(upb_json_parser *p); UPB_END_EXTERN_C @@ -121,11 +58,8 @@ UPB_END_EXTERN_C namespace upb { namespace json { -inline Parser::Parser(Status* status) { upb_json_parser_init(this, status); } -inline Parser::~Parser() { upb_json_parser_uninit(this); } -inline void Parser::Reset() { upb_json_parser_reset(this); } -inline void Parser::ResetOutput(Sink* output) { - upb_json_parser_resetoutput(this, output); +inline Parser* Parser::Create(Environment* env, Sink* output) { + return upb_json_parser_create(env, output); } inline BytesSink* Parser::input() { return upb_json_parser_input(this); |