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 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 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

       === ===