diff options
Diffstat (limited to 'ext/ply/CHANGES')
| -rw-r--r-- | ext/ply/CHANGES | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/ext/ply/CHANGES b/ext/ply/CHANGES new file mode 100644 index 000000000..9c7334066 --- /dev/null +++ b/ext/ply/CHANGES @@ -0,0 +1,158 @@ +Version 1.3 +------------------------------ +12/10/02: jmdyck + Various minor adjustments to the code that Dave checked in today. + Updated test/yacc_{inf,unused}.exp to reflect today's changes. + +12/10/02: beazley + Incorporated a variety of minor bug fixes to empty production + handling and infinite recursion checking. Contributed by + Michael Dyck. + +12/10/02: beazley + Removed bogus recover() method call in yacc.restart() + +Version 1.2 +------------------------------ +11/27/02: beazley + Lexer and parser objects are now available as an attribute + of tokens and slices respectively. For example: + + def t_NUMBER(t): + r'\d+' + print t.lexer + + def p_expr_plus(t): + 'expr: expr PLUS expr' + print t.lexer + print t.parser + + This can be used for state management (if needed). + +10/31/02: beazley + Modified yacc.py to work with Python optimize mode. To make + this work, you need to use + + yacc.yacc(optimize=1) + + Furthermore, you need to first run Python in normal mode + to generate the necessary parsetab.py files. After that, + you can use python -O or python -OO. + + Note: optimized mode turns off a lot of error checking. + Only use when you are sure that your grammar is working. + Make sure parsetab.py is up to date! + +10/30/02: beazley + Added cloning of Lexer objects. For example: + + import copy + l = lex.lex() + lc = copy.copy(l) + + l.input("Some text") + lc.input("Some other text") + ... + + This might be useful if the same "lexer" is meant to + be used in different contexts---or if multiple lexers + are running concurrently. + +10/30/02: beazley + Fixed subtle bug with first set computation and empty productions. + Patch submitted by Michael Dyck. + +10/30/02: beazley + Fixed error messages to use "filename:line: message" instead + of "filename:line. message". This makes error reporting more + friendly to emacs. Patch submitted by Fran�ois Pinard. + +10/30/02: beazley + Improvements to parser.out file. Terminals and nonterminals + are sorted instead of being printed in random order. + Patch submitted by Fran�ois Pinard. + +10/30/02: beazley + Improvements to parser.out file output. Rules are now printed + in a way that's easier to understand. Contributed by Russ Cox. + +10/30/02: beazley + Added 'nonassoc' associativity support. This can be used + to disable the chaining of operators like a < b < c. + To use, simply specify 'nonassoc' in the precedence table + + precedence = ( + ('nonassoc', 'LESSTHAN', 'GREATERTHAN'), # Nonassociative operators + ('left', 'PLUS', 'MINUS'), + ('left', 'TIMES', 'DIVIDE'), + ('right', 'UMINUS'), # Unary minus operator + ) + + Patch contributed by Russ Cox. + +10/30/02: beazley + Modified the lexer to provide optional support for Python -O and -OO + modes. To make this work, Python *first* needs to be run in + unoptimized mode. This reads the lexing information and creates a + file "lextab.py". Then, run lex like this: + + # module foo.py + ... + ... + lex.lex(optimize=1) + + Once the lextab file has been created, subsequent calls to + lex.lex() will read data from the lextab file instead of using + introspection. In optimized mode (-O, -OO) everything should + work normally despite the loss of doc strings. + + To change the name of the file 'lextab.py' use the following: + + lex.lex(lextab="footab") + + (this creates a file footab.py) + + +Version 1.1 October 25, 2001 +------------------------------ + +10/25/01: beazley + Modified the table generator to produce much more compact data. + This should greatly reduce the size of the parsetab.py[c] file. + Caveat: the tables still need to be constructed so a little more + work is done in parsetab on import. + +10/25/01: beazley + There may be a possible bug in the cycle detector that reports errors + about infinite recursion. I'm having a little trouble tracking it + down, but if you get this problem, you can disable the cycle + detector as follows: + + yacc.yacc(check_recursion = 0) + +10/25/01: beazley + Fixed a bug in lex.py that sometimes caused illegal characters to be + reported incorrectly. Reported by Sverre J�rgensen. + +7/8/01 : beazley + Added a reference to the underlying lexer object when tokens are handled by + functions. The lexer is available as the 'lexer' attribute. This + was added to provide better lexing support for languages such as Fortran + where certain types of tokens can't be conveniently expressed as regular + expressions (and where the tokenizing function may want to perform a + little backtracking). Suggested by Pearu Peterson. + +6/20/01 : beazley + Modified yacc() function so that an optional starting symbol can be specified. + For example: + + yacc.yacc(start="statement") + + Normally yacc always treats the first production rule as the starting symbol. + However, if you are debugging your grammar it may be useful to specify + an alternative starting symbol. Idea suggested by Rich Salz. + +Version 1.0 June 18, 2001 +-------------------------- +Initial public offering + |