Module(Parsing)

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 lhs_start and lhs_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.