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|
#! /usr/bin/env python
# tokenize.py
#
# Parses a C/C++/C#/D/Java/Pawn/whatever file in an array of
# tuples (string, type)
#
# punctuator lookup table
punc_table = [
[ '!', 25, 26, '!' ], # 0: '!'
[ '#', 24, 35, '#' ], # 1: '#'
[ '$', 23, 0, '$' ], # 2: '$'
[ '%', 22, 36, '%' ], # 3: '%'
[ '&', 21, 41, '&' ], # 4: '&'
[ '(', 20, 0, '(' ], # 5: '('
[ ')', 19, 0, ')' ], # 6: ')'
[ '*', 18, 43, '*' ], # 7: '*'
[ '+', 17, 44, '+' ], # 8: '+'
[ ',', 16, 0, ',' ], # 9: ','
[ '-', 15, 46, '-' ], # 10: '-'
[ '.', 14, 50, '.' ], # 11: '.'
[ '/', 13, 53, '/' ], # 12: '/'
[ ':', 12, 54, ':' ], # 13: ':'
[ ';', 11, 0, ';' ], # 14: ';'
[ '<', 10, 56, '<' ], # 15: '<'
[ '=', 9, 63, '=' ], # 16: '='
[ '>', 8, 65, '>' ], # 17: '>'
[ '?', 7, 0, '?' ], # 18: '?'
[ '[', 6, 70, '[' ], # 19: '['
[ ']', 5, 0, ']' ], # 20: ']'
[ '^', 4, 71, '^' ], # 21: '^'
[ '{', 3, 0, '{' ], # 22: '{'
[ '|', 2, 72, '|' ], # 23: '|'
[ '}', 1, 0, '}' ], # 24: '}'
[ '~', 0, 74, '~' ], # 25: '~'
[ '<', 3, 30, '!<' ], # 26: '!<'
[ '=', 2, 33, '!=' ], # 27: '!='
[ '>', 1, 34, '!>' ], # 28: '!>'
[ '~', 0, 0, '!~' ], # 29: '!~'
[ '=', 1, 0, '!<=' ], # 30: '!<='
[ '>', 0, 32, '!<>' ], # 31: '!<>'
[ '=', 0, 0, '!<>='], # 32: '!<>='
[ '=', 0, 0, '!==' ], # 33: '!=='
[ '=', 0, 0, '!>=' ], # 34: '!>='
[ '#', 0, 0, '##' ], # 35: '##'
[ ':', 2, 39, '%:' ], # 36: '%:'
[ '=', 1, 0, '%=' ], # 37: '%='
[ '>', 0, 0, '%>' ], # 38: '%>'
[ '%', 0, 40, None ], # 39: '%:%'
[ ':', 0, 0, '%:%:'], # 40: '%:%:'
[ '&', 1, 0, '&&' ], # 41: '&&'
[ '=', 0, 0, '&=' ], # 42: '&='
[ '=', 0, 0, '*=' ], # 43: '*='
[ '+', 1, 0, '++' ], # 44: '++'
[ '=', 0, 0, '+=' ], # 45: '+='
[ '-', 2, 0, '--' ], # 46: '--'
[ '=', 1, 0, '-=' ], # 47: '-='
[ '>', 0, 49, '->' ], # 48: '->'
[ '*', 0, 0, '->*' ], # 49: '->*'
[ '*', 1, 0, '.*' ], # 50: '.*'
[ '.', 0, 52, '..' ], # 51: '..'
[ '.', 0, 0, '...' ], # 52: '...'
[ '=', 0, 0, '/=' ], # 53: '/='
[ ':', 1, 0, '::' ], # 54: '::'
[ '>', 0, 0, ':>' ], # 55: ':>'
[ '%', 4, 0, '<%' ], # 56: '<%'
[ ':', 3, 0, '<:' ], # 57: '<:'
[ '<', 2, 61, '<<' ], # 58: '<<'
[ '=', 1, 0, '<=' ], # 59: '<='
[ '>', 0, 62, '<>' ], # 60: '<>'
[ '=', 0, 0, '<<=' ], # 61: '<<='
[ '=', 0, 0, '<>=' ], # 62: '<>='
[ '=', 0, 64, '==' ], # 63: '=='
[ '=', 0, 0, '===' ], # 64: '==='
[ '=', 1, 0, '>=' ], # 65: '>='
[ '>', 0, 67, '>>' ], # 66: '>>'
[ '=', 1, 0, '>>=' ], # 67: '>>='
[ '>', 0, 69, '>>>' ], # 68: '>>>'
[ '=', 0, 0, '>>>='], # 69: '>>>='
[ ']', 0, 0, '[]' ], # 70: '[]'
[ '=', 0, 0, '^=' ], # 71: '^='
[ '=', 1, 0, '|=' ], # 72: '|='
[ '|', 0, 0, '||' ], # 73: '||'
[ '=', 1, 0, '~=' ], # 74: '~='
[ '~', 0, 0, '~~' ], # 75: '~~'
]
#
# Token types:
# 0 = newline
# 1 = punctuator
# 2 = integer
# 3 = float
# 4 = string
# 5 = identifier
#
class Tokenizer:
def __init__(self):
self.tokens = []
self.text = ''
self.text_idx = 0
def tokenize_text(self, in_text):
self.tokens = []
self.text = in_text
self.text_idx = 0
print(in_text)
try:
while self.text_idx < len(self.text):
if self.parse_whitespace():
continue
elif self.text[self.text_idx] == '\\' and self.text[self.text_idx + 1] == '\n':
self.text_idx += 2
continue
elif self.parse_comment():
continue
elif self.parse_number():
continue
elif self.parse_identifier():
continue
elif self.parse_string():
continue
elif self.parse_punctuator():
continue
else:
print("confused: %s" % self.text[self.text_idx:])
break
except:
print("bombed")
raise
def parse_whitespace(self):
start_idx = self.text_idx
hit_newline = False
while self.text_idx < len(self.text):
if self.text[self.text_idx] in '\n\r':
hit_newline = True
elif not self.text[self.text_idx] in ' \t':
break
self.text_idx += 1
if hit_newline:
self.tokens.append(('\n', 0))
return start_idx != self.text_idx
def parse_comment(self):
if not self.text[self.text_idx] == '/' or not self.text[self.text_idx + 1] in '/*':
return False
if self.text[self.text_idx + 1] == '/':
while self.text_idx < len(self.text):
if self.text[self.text_idx] in '\n\r':
break
self.text_idx += 1
else:
while self.text_idx < len(self.text) - 1:
if self.text[self.text_idx] == '*' and self.text[self.text_idx + 1] == '/':
self.text_idx += 2
break
self.text_idx += 1
return True
def parse_identifier(self):
if not self.text[self.text_idx].upper() in '@_ABCDEFGHIJKLMNOPQRSTUVWXYZ':
return False
start_idx = self.text_idx
while self.text_idx < len(self.text) and \
self.text[self.text_idx].upper() in '@_ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890':
self.text_idx += 1
self.tokens.append((self.text[start_idx : self.text_idx], 5))
return True
def parse_string(self):
starter = 0
start_ch = self.text[self.text_idx]
if start_ch == 'L':
starter = 1
start_ch = self.text[self.text_idx + 1]
if not start_ch in '"\'':
return False
start_idx = self.text_idx
self.text_idx += starter + 1
escaped = False
while self.text_idx < len(self.text):
if escaped:
escaped = False
else:
if self.text[self.text_idx] == '\\':
escaped = True
elif self.text[self.text_idx] == start_ch:
self.text_idx += 1
break
self.text_idx += 1
self.tokens.append((self.text[start_idx : self.text_idx], 4))
return True
# Checks for punctuators
# Returns whether a punctuator was consumed (True or False)
def parse_punctuator(self):
tab_idx = 0
punc_len = 0
saved_punc = None
while 1:
pte = punc_table[tab_idx]
if pte[0] == self.text[self.text_idx]:
if pte[3] is not None:
saved_punc = pte[3]
self.text_idx += 1
tab_idx = pte[2]
if tab_idx == 0:
break
elif pte[1] == 0:
break
else:
tab_idx += 1
if saved_punc is not None:
self.tokens.append((saved_punc, 1))
return True
return False
def parse_number(self):
# A number must start with a digit or a dot followed by a digit
ch = self.text[self.text_idx]
if not ch.isdigit() and (ch != '.' or not self.text[self.text_idx + 1].isdigit()):
return False
token_type = 2 # integer
if ch == '.':
token_type = 3 # float
did_hex = False
start_idx = self.text_idx
# Check for Hex, Octal, or Binary
# Note that only D and Pawn support binary, but who cares?
#
if ch == '0':
self.text_idx += 1
ch = self.text[self.text_idx].upper()
if ch == 'X': # hex
did_hex = True
self.text_idx += 1
while self.text[self.text_idx] in '_0123456789abcdefABCDEF':
self.text_idx += 1
elif ch == 'B': # binary
self.text_idx += 1
while self.text[self.text_idx] in '_01':
self.text_idx += 1
elif ch >= '0' and ch <= 7: # octal (but allow decimal)
self.text_idx += 1
while self.text[self.text_idx] in '_0123456789':
self.text_idx += 1
else:
# either just 0 or 0.1 or 0UL, etc
pass
else:
# Regular int or float
while self.text[self.text_idx] in '_0123456789':
self.text_idx += 1
# Check if we stopped on a decimal point
if self.text[self.text_idx] == '.':
self.text_idx += 1
token_type = 3 # float
if did_hex:
while self.text[self.text_idx] in '_0123456789abcdefABCDEF':
self.text_idx += 1
else:
while self.text[self.text_idx] in '_0123456789':
self.text_idx += 1
# Check exponent
# Valid exponents per language (not that it matters):
# C/C++/D/Java: eEpP
# C#/Pawn: eE
if self.text[self.text_idx] in 'eEpP':
token_type = 3 # float
self.text_idx += 1
if self.text[self.text_idx] in '+-':
self.text_idx += 1
while self.text[self.text_idx] in '_0123456789':
self.text_idx += 1
# Check the suffixes
# Valid suffixes per language (not that it matters):
# Integer Float
# C/C++: uUlL lLfF
# C#: uUlL fFdDMm
# D: uUL ifFL
# Java: lL fFdD
# Pawn: (none) (none)
#
# Note that i, f, d, and m only appear in floats.
while 1:
if self.text[self.text_idx] in 'tTfFdDmM':
token_type = 3 # float
elif not self.text[self.text_idx] in 'lLuU':
break
self.text_idx += 1
self.tokens.append((self.text[start_idx : self.text_idx], token_type))
return True
text = """
1.23+4-3*16%2 *sin(1.e-3 + .5p32) "hello" and "hello\\"there"
123 // some comment
a = b + c;
#define abc \\
5
d = 5 /* hello */ + 3;
"""
t = Tokenizer()
t.tokenize_text(text)
print(t.tokens)
|
