Think Python Code

#! /usr/bin/env python

"""Token constants (from "token.h")."""

#  This file is automatically generated; please don't muck it up!
#
#  To update the symbols in this file, 'cd' to the top directory of
#  the python source tree after building the interpreter and run:
#
#    python Lib/token.py

#--start constants--
ENDMARKER = 0
NAME = 1
NUMBER = 2
STRING = 3
NEWLINE = 4
INDENT = 5
DEDENT = 6
LPAR = 7
RPAR = 8
LSQB = 9
RSQB = 10
COLON = 11
COMMA = 12
SEMI = 13
PLUS = 14
MINUS = 15
STAR = 16
SLASH = 17
VBAR = 18
AMPER = 19
LESS = 20
GREATER = 21
EQUAL = 22
DOT = 23
PERCENT = 24
BACKQUOTE = 25
LBRACE = 26
RBRACE = 27
EQEQUAL = 28
NOTEQUAL = 29
LESSEQUAL = 30
GREATEREQUAL = 31
TILDE = 32
CIRCUMFLEX = 33
LEFTSHIFT = 34
RIGHTSHIFT = 35
DOUBLESTAR = 36
PLUSEQUAL = 37
MINEQUAL = 38
STAREQUAL = 39
SLASHEQUAL = 40
PERCENTEQUAL = 41
AMPEREQUAL = 42
VBAREQUAL = 43
CIRCUMFLEXEQUAL = 44
LEFTSHIFTEQUAL = 45
RIGHTSHIFTEQUAL = 46
DOUBLESTAREQUAL = 47
DOUBLESLASH = 48
DOUBLESLASHEQUAL = 49
AT = 50
OP = 51
ERRORTOKEN = 52
N_TOKENS = 53
NT_OFFSET = 256
#--end constants--

tok_name = {}
for _name, _value in globals().items():
    if type(_value) is type(0):
        tok_name[_value] = _name
del _name, _value


def ISTERMINAL(x):
    return x < NT_OFFSET

def ISNONTERMINAL(x):
    return x >= NT_OFFSET

def ISEOF(x):
    return x == ENDMARKER


def main():
    import re
    import sys
    args = sys.argv[1:]
    inFileName = args and args[0] or "Include/token.h"
    outFileName = "Lib/token.py"
    if len(args) > 1:
        outFileName = args[1]
    try:
        fp = open(inFileName)
    except IOError, err:
        sys.stdout.write("I/O error: %s\n" % str(err))
        sys.exit(1)
    lines = fp.read().split("\n")
    fp.close()
    prog = re.compile(
        "#define[ \t][ \t]*([A-Z0-9][A-Z0-9_]*)[ \t][ \t]*([0-9][0-9]*)",
        re.IGNORECASE)
    tokens = {}
    for line in lines:
        match = prog.match(line)
        if match:
            name, val = match.group(1, 2)
            val = int(val)
            tokens[val] = name          # reverse so we can sort them...
    keys = tokens.keys()
    keys.sort()
    # load the output skeleton from the target:
    try:
        fp = open(outFileName)
    except IOError, err:
        sys.stderr.write("I/O error: %s\n" % str(err))
        sys.exit(2)
    format = fp.read().split("\n")
    fp.close()
    try:
        start = format.index("#--start constants--") + 1
        end = format.index("#--end constants--")
    except ValueError:
        sys.stderr.write("target does not contain format markers")
        sys.exit(3)
    lines = []
    for val in keys:
        lines.append("%s = %d" % (tokens[val], val))
    format[start:end] = lines
    try:
        fp = open(outFileName, 'w')
    except IOError, err:
        sys.stderr.write("I/O error: %s\n" % str(err))
        sys.exit(4)
    fp.write("\n".join(format))
    fp.close()


if __name__ == "__main__":
    main()