Mercurial > cpython-lru_cache-weakref

annotate Lib/tokenize.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 138b176ec40f
children e497a7fc0aa8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Tokenization help for Python programs.
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2
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3 This module exports a function called 'tokenize()' that breaks a stream of
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4 text into Python tokens. It accepts a readline-like method which is called
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5 repeatedly to get the next line of input (or "" for EOF) and a "token-eater"
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6 function which is called once for each token found. The latter function is
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7 passed the token type, a string containing the token, the starting and
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8 ending (row, column) coordinates of the token, and the original line. It is
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9 designed to match the working of the Python tokenizer exactly, except that
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10 it produces COMMENT tokens for comments and gives type OP for all operators.
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11
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12 For compatibility with the older 'tokenize' module, this also compiles a
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13 regular expression into 'tokenprog' that matches Python tokens in individual
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14 lines of text, leaving the token in 'tokenprog.group(3)', but does not
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15 handle indentation, continuations, or multi-line strings."""
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16
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17 __version__ = "Ka-Ping Yee, 29 March 1997"
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19 import string, regex
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20 from token import *
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21
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22 COMMENT = N_TOKENS
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23 tok_name[COMMENT] = 'COMMENT'
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24
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25 # Changes from 1.3:
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26 # Ignore now accepts \f as whitespace. Operator now includes '**'.
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27 # Ignore and Special now accept \n or \r\n at the end of a line.
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28 # Imagnumber is new. Expfloat is corrected to reject '0e4'.
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29 # Note: to get a quoted backslash in a regex, it must be enclosed in brackets.
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30
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31 def group(*choices): return '\(' + string.join(choices, '\|') + '\)'
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32
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33 Whitespace = '[ \f\t]*'
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34 Comment = '\(#[^\r\n]*\)'
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35 Ignore = Whitespace + group('[\]\r?\n' + Whitespace)+'*' + Comment+'?'
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36 Name = '[a-zA-Z_][a-zA-Z0-9_]*'
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37
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38 Hexnumber = '0[xX][0-9a-fA-F]*[lL]?'
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39 Octnumber = '0[0-7]*[lL]?'
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40 Decnumber = '[1-9][0-9]*[lL]?'
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41 Intnumber = group(Hexnumber, Octnumber, Decnumber)
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42 Exponent = '[eE][-+]?[0-9]+'
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43 Pointfloat = group('[0-9]+\.[0-9]*', '\.[0-9]+') + group(Exponent) + '?'
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44 Expfloat = '[1-9][0-9]*' + Exponent
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45 Floatnumber = group(Pointfloat, Expfloat)
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46 Imagnumber = group('0[jJ]', '[1-9][0-9]*[jJ]', Floatnumber + '[jJ]')
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47 Number = group(Imagnumber, Floatnumber, Intnumber)
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48
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49 Single = group("[^'\]", "[\].") + "*'"
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50 Double = group('[^"\]', '[\].') + '*"'
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51 Single3 = group("[^'\]","[\].","'[^'\]","'[\].","''[^'\]","''[\].") + "*'''"
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52 Double3 = group('[^"\]','[\].','"[^"\]','"[\].','""[^"\]','""[\].') + '*"""'
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53 Triple = group("'''", '"""')
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54 String = group("'" + group("[^\n'\]", "[\].") + "*'",
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55 '"' + group('[^\n"\]', '[\].') + '*"')
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56
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57 Operator = group('\+', '\-', '\*\*', '\*', '\^', '~', '/', '%', '&', '|',
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58 '<<', '>>', '==', '<=', '<>', '!=', '>=', '=', '<', '>')
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59 Bracket = '[][(){}]'
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60 Special = group('\r?\n', '[:;.,`]')
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61 Funny = group(Operator, Bracket, Special)
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62
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63 PlainToken = group(Name, Number, String, Funny)
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64 Token = Ignore + PlainToken
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65
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66 ContStr = group("'" + group('[\].', "[^\n'\]")+'*' + group("'", '[\]\r?\n'),
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67 '"' + group('[\].', '[^\n"\]')+'*' + group('"', '[\]\r?\n'))
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68 PseudoExtras = group('[\]\r?\n', Comment, Triple)
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69 PseudoToken = Whitespace + group(PseudoExtras, Name, Number, ContStr, Funny)
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70
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71 try:
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72 saved_syntax = regex.set_syntax(0) # use default syntax
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73 tokenprog = regex.compile(Token)
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74 pseudoprog = regex.compile(PseudoToken)
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75 endprogs = { '\'': regex.compile(Single), '"': regex.compile(Double),
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76 '\'\'\'': regex.compile(Single3), '"""': regex.compile(Double3) }
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77 finally:
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78 regex.set_syntax(saved_syntax) # restore original syntax
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79
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80 tabsize = 8
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81 TokenError = 'TokenError'
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82 def printtoken(type, token, (srow, scol), (erow, ecol), line): # for testing
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83 print "%d,%d-%d,%d:\t%s\t%s" % \
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84 (srow, scol, erow, ecol, tok_name[type], repr(token))
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85
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86 def tokenize(readline, tokeneater=printtoken):
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87 lnum = parenlev = continued = 0
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88 namechars, numchars = string.letters + '_', string.digits
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89 contstr, needcont = '', 0
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90 indents = [0]
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91
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92 while 1: # loop over lines in stream
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93 line = readline()
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94 lnum = lnum + 1
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95 pos, max = 0, len(line)
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96
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97 if contstr: # continued string
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98 if not line:
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99 raise TokenError, ("EOF in multi-line string", strstart)
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100 if endprog.match(line) >= 0:
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101 pos = end = endprog.regs[0][1]
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102 tokeneater(STRING, contstr + line[:end],
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103 strstart, (lnum, end), line)
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104 contstr, needcont = '', 0
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105 elif needcont and line[-2:] != '\\\n' and line[-3:] != '\\\r\n':
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106 tokeneater(ERRORTOKEN, contstr + line,
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107 strstart, (lnum, len(line)), line)
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108 contstr = ''
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109 continue
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110 else:
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111 contstr = contstr + line
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112 continue
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113
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114 elif parenlev == 0 and not continued: # new statement
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115 if not line: break
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116 column = 0
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117 while pos < max: # measure leading whitespace
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118 if line[pos] == ' ': column = column + 1
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119 elif line[pos] == '\t': column = (column/tabsize + 1)*tabsize
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120 elif line[pos] == '\f': column = 0
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121 else: break
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122 pos = pos + 1
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123 if pos == max: break
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124
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125 if line[pos] in '#\r\n': # skip comments or blank lines
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126 tokeneater((NEWLINE, COMMENT)[line[pos] == '#'], line[pos:],
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127 (lnum, pos), (lnum, len(line)), line)
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128 continue
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129
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130 if column > indents[-1]: # count indents or dedents
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131 indents.append(column)
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132 tokeneater(INDENT, line[:pos], (lnum, 0), (lnum, pos), line)
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133 while column < indents[-1]:
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134 indents = indents[:-1]
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135 tokeneater(DEDENT, '', (lnum, pos), (lnum, pos), line)
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136
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137 else: # continued statement
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138 if not line:
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139 raise TokenError, ("EOF in multi-line statement", (lnum, 0))
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140 continued = 0
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141
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142 while pos < max:
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143 if pseudoprog.match(line, pos) > 0: # scan for tokens
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144 start, end = pseudoprog.regs[1]
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145 spos, epos, pos = (lnum, start), (lnum, end), end
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146 token, initial = line[start:end], line[start]
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147
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148 if initial in namechars: # ordinary name
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149 tokeneater(NAME, token, spos, epos, line)
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150 elif initial in numchars \
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151 or (initial == '.' and token != '.'): # ordinary number
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152 tokeneater(NUMBER, token, spos, epos, line)
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153 elif initial in '\r\n':
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154 tokeneater(NEWLINE, token, spos, epos, line)
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155 elif initial == '#':
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156 tokeneater(COMMENT, token, spos, epos, line)
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157 elif initial == '\\': # continued stmt
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158 continued = 1
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159 elif token in ('\'\'\'', '"""'): # triple-quoted
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160 endprog = endprogs[token]
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161 if endprog.match(line, pos) >= 0: # all on one line
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162 pos = endprog.regs[0][1]
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163 token = line[start:pos]
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164 tokeneater(STRING, token, spos, (lnum, pos), line)
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165 else:
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166 strstart = (lnum, start) # multiple lines
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167 contstr = line[start:]
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168 break
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169 elif initial in '\'"':
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170 if token[-1] == '\n': # continued string
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171 strstart = (lnum, start)
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172 endprog = endprogs[initial]
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173 contstr, needcont = line[start:], 1
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174 break
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175 else: # ordinary string
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176 tokeneater(STRING, token, spos, epos, line)
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177 else:
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178 if initial in '([{': parenlev = parenlev + 1
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179 elif initial in ')]}': parenlev = parenlev - 1
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180 tokeneater(OP, token, spos, epos, line)
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181 else:
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182 tokeneater(ERRORTOKEN, line[pos],
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183 (lnum, pos), (lnum, pos+1), line)
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184 pos = pos + 1
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185
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186 for indent in indents[1:]: # pop remaining indent levels
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187 tokeneater(DEDENT, '', (lnum, 0), (lnum, 0), '')
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188 tokeneater(ENDMARKER, '', (lnum, 0), (lnum, 0), '')
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189
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190 if __name__ == '__main__': # testing
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191 import sys
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192 if len(sys.argv) > 1: tokenize(open(sys.argv[1]).readline)
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193 else: tokenize(sys.stdin.readline)