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Parsing(3)				  OCaml library 			       Parsing(3)

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 offset 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 parame-
       ter 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 returned, 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				    2014-06-09				       Parsing(3)
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