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## page was renamed from enhancements/AutoGenParser ## page was renamed from enhancements/AutoGenParser Autogenerated parser
CEP 902 - Build parser from grammar file
- Status: Wanted
- Implementation status: Prototyped
- Comments: This is part of FabrizioM's GSoC 2008 project proposal
The idea is to genereate the parser starting from the Python standard definition Grammar
# Python24.gra ... compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | with_stmt | funcdef | classdef if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite] while_stmt: 'while' test ':' suite ['else' ':' suite] for_stmt: 'for' exprlist 'in' testlist ':' suite ['else' ':' suite] try_stmt: ('try' ':' suite ((except_clause ':' suite)+ ['else' ':' suite] ['finally' ':' suite] | 'finally' ':' suite)) ...
the main benefit is that you don't need to modify the parser code by hand. This is not much a issue from python 2.3 to 2.5 but think to [:enhancements/3000: Python3000] support where Grammar change slightly more. The Full [:enchancements/FullPython2.5: Python2.5] Task will benefit from this stage. You generate the parser from a grammar file
parser = build_parser ('Python24.gra')
All this machinery is already done.
- ([:enhancements/Parser/Status: Status])
- [:enhancements/Parser/Grammar: Cython Grammar File]
A new grammar is can be found at https://github.com/cython/cython/pull/326