Parsing(3) OCaml library Parsing(3)NAMEParsing - The run-time library for parsers generated by ocamlyacc.
Module
Module ParsingDocumentation
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
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 2013-10-24 Parsing(3)
