titus.prettypfa.Parser¶

class titus.prettypfa.Parser(wholeDocument)[source]¶

Bases: object

Parser for the “ply” package, specialized for PrettyPFA (whole document or expression).

Includes both the tokenizer and the parser.

__init__(wholeDocument)¶

Creates the Parser, but it is only ready to use after calling initialize.

Parameters:	wholeDocument (bool) – if True, this parser expects a whole PFA document and parse returns a titus.pfaast.EngineConfig; otherwise, this parser expects a PFA expression and parse returns a titus.pfaast.Expression

initialize(lex, yacc)¶

Initialize the Parser by passing it the appropriate ply modules.

Parameters:	lex (Python module) – ply.lex after import ply.lex yacc (Python module) – ply.yacc after import ply.yacc
Return type:	None
Returns:	nothing

parse(text, subs)¶

Parse the given text, returning a PFA abstract syntax tree.

Parameters:	text (string) – command line to parse subs (dict of substitutions) – substitutions to apply to any strings in <<French quotes>>
Return type:	titus.pfaast.EngineConfig or titus.pfaast.Expression
Returns:	parsed text as an abstract syntax tree