Parsing(3o) OCaml library Parsing(3o) NAME Parsing - The run-time library for parsers generated by ocamlyacc. Module Module Parsing Documentation Module Parsing : sig end The run-time library for parsers generated by ocamlyacc . val symbol_start : unit -> int symbol_start and Parsing.symbol_end are to be called in the action part of a grammar rule only. They return the offset of the string that matches the left-hand side of the rule: symbol_start() returns the off- set of the first character; symbol_end() returns the offset after the last character. The first character in a file is at offset 0. val symbol_end : unit -> int See Parsing.symbol_start . val rhs_start : int -> int Same as Parsing.symbol_start and Parsing.symbol_end , but return the offset of the string matching the n th item on the right-hand side of the rule, where n is the integer parameter to rhs_start and rhs_end . n is 1 for the leftmost item. val rhs_end : int -> int See Parsing.rhs_start . val symbol_start_pos : unit -> Lexing.position Same as symbol_start , but return a position instead of an offset. val symbol_end_pos : unit -> Lexing.position Same as symbol_end , but return a position instead of an offset. val rhs_start_pos : int -> Lexing.position Same as rhs_start , but return a position instead of an offset. val rhs_end_pos : int -> Lexing.position Same as rhs_end , but return a position instead of an offset. val clear_parser : unit -> unit Empty the parser stack. Call it just after a parsing function has re- turned, to remove all pointers from the parser stack to structures that were built by semantic actions during parsing. This is optional, but lowers the memory requirements of the programs. exception Parse_error Raised when a parser encounters a syntax error. Can also be raised from the action part of a grammar rule, to initiate error recovery. val set_trace : bool -> bool Control debugging support for ocamlyacc -generated parsers. After Parsing.set_trace true , the pushdown automaton that executes the parsers prints a trace of its actions (reading a token, shifting a state, reducing by a rule) on standard output. Parsing.set_trace false turns this debugging trace off. The boolean returned is the previous state of the trace flag. Since 3.11.0 OCamldoc 2023-02-12 Parsing(3o)
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