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193 lines
8.4 KiB
Python
193 lines
8.4 KiB
Python
"""Tokenization help for Python programs.
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This module exports a function called 'tokenize()' that breaks a stream of
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text into Python tokens. It accepts a readline-like method which is called
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repeatedly to get the next line of input (or "" for EOF) and a "token-eater"
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function which is called once for each token found. The latter function is
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passed the token type, a string containing the token, the starting and
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ending (row, column) coordinates of the token, and the original line. It is
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designed to match the working of the Python tokenizer exactly, except that
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it produces COMMENT tokens for comments and gives type OP for all operators.
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For compatibility with the older 'tokenize' module, this also compiles a
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regular expression into 'tokenprog' that matches Python tokens in individual
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lines of text, leaving the token in 'tokenprog.group(3)', but does not
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handle indentation, continuations, or multi-line strings."""
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__version__ = "Ka-Ping Yee, 29 March 1997"
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import string, regex
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from token import *
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COMMENT = N_TOKENS
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tok_name[COMMENT] = 'COMMENT'
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# Changes from 1.3:
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# Ignore now accepts \f as whitespace. Operator now includes '**'.
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# Ignore and Special now accept \n or \r\n at the end of a line.
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# Imagnumber is new. Expfloat is corrected to reject '0e4'.
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# Note: to get a quoted backslash in a regex, it must be enclosed in brackets.
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def group(*choices): return '\(' + string.join(choices, '\|') + '\)'
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Whitespace = '[ \f\t]*'
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Comment = '\(#[^\r\n]*\)'
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Ignore = Whitespace + group('[\]\r?\n' + Whitespace)+'*' + Comment+'?'
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Name = '[a-zA-Z_][a-zA-Z0-9_]*'
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Hexnumber = '0[xX][0-9a-fA-F]*[lL]?'
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Octnumber = '0[0-7]*[lL]?'
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Decnumber = '[1-9][0-9]*[lL]?'
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Intnumber = group(Hexnumber, Octnumber, Decnumber)
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Exponent = '[eE][-+]?[0-9]+'
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Pointfloat = group('[0-9]+\.[0-9]*', '\.[0-9]+') + group(Exponent) + '?'
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Expfloat = '[1-9][0-9]*' + Exponent
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Floatnumber = group(Pointfloat, Expfloat)
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Imagnumber = group('0[jJ]', '[1-9][0-9]*[jJ]', Floatnumber + '[jJ]')
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Number = group(Imagnumber, Floatnumber, Intnumber)
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Single = group("[^'\]", "[\].") + "*'"
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Double = group('[^"\]', '[\].') + '*"'
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Single3 = group("[^'\]","[\].","'[^'\]","'[\].","''[^'\]","''[\].") + "*'''"
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Double3 = group('[^"\]','[\].','"[^"\]','"[\].','""[^"\]','""[\].') + '*"""'
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Triple = group("'''", '"""')
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String = group("'" + group("[^\n'\]", "[\].") + "*'",
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'"' + group('[^\n"\]', '[\].') + '*"')
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Operator = group('\+', '\-', '\*\*', '\*', '\^', '~', '/', '%', '&', '|',
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'<<', '>>', '==', '<=', '<>', '!=', '>=', '=', '<', '>')
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Bracket = '[][(){}]'
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Special = group('\r?\n', '[:;.,`]')
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Funny = group(Operator, Bracket, Special)
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PlainToken = group(Name, Number, String, Funny)
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Token = Ignore + PlainToken
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ContStr = group("'" + group('[\].', "[^\n'\]")+'*' + group("'", '[\]\r?\n'),
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'"' + group('[\].', '[^\n"\]')+'*' + group('"', '[\]\r?\n'))
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PseudoExtras = group('[\]\r?\n', Comment, Triple)
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PseudoToken = Whitespace + group(PseudoExtras, Name, Number, ContStr, Funny)
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try:
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saved_syntax = regex.set_syntax(0) # use default syntax
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tokenprog = regex.compile(Token)
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pseudoprog = regex.compile(PseudoToken)
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endprogs = { '\'': regex.compile(Single), '"': regex.compile(Double),
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'\'\'\'': regex.compile(Single3), '"""': regex.compile(Double3) }
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finally:
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regex.set_syntax(saved_syntax) # restore original syntax
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tabsize = 8
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TokenError = 'TokenError'
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def printtoken(type, token, (srow, scol), (erow, ecol), line): # for testing
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print "%d,%d-%d,%d:\t%s\t%s" % \
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(srow, scol, erow, ecol, tok_name[type], repr(token))
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def tokenize(readline, tokeneater=printtoken):
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lnum = parenlev = continued = 0
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namechars, numchars = string.letters + '_', string.digits
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contstr, needcont = '', 0
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indents = [0]
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while 1: # loop over lines in stream
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line = readline()
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lnum = lnum + 1
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pos, max = 0, len(line)
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if contstr: # continued string
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if not line:
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raise TokenError, ("EOF in multi-line string", strstart)
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if endprog.match(line) >= 0:
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pos = end = endprog.regs[0][1]
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tokeneater(STRING, contstr + line[:end],
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strstart, (lnum, end), line)
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contstr, needcont = '', 0
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elif needcont and line[-2:] != '\\\n' and line[-3:] != '\\\r\n':
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tokeneater(ERRORTOKEN, contstr + line,
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strstart, (lnum, len(line)), line)
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contstr = ''
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continue
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else:
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contstr = contstr + line
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continue
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elif parenlev == 0 and not continued: # new statement
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if not line: break
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column = 0
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while pos < max: # measure leading whitespace
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if line[pos] == ' ': column = column + 1
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elif line[pos] == '\t': column = (column/tabsize + 1)*tabsize
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elif line[pos] == '\f': column = 0
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else: break
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pos = pos + 1
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if pos == max: break
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if line[pos] in '#\r\n': # skip comments or blank lines
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tokeneater((NEWLINE, COMMENT)[line[pos] == '#'], line[pos:],
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(lnum, pos), (lnum, len(line)), line)
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continue
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if column > indents[-1]: # count indents or dedents
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indents.append(column)
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tokeneater(INDENT, line[:pos], (lnum, 0), (lnum, pos), line)
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while column < indents[-1]:
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indents = indents[:-1]
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tokeneater(DEDENT, '', (lnum, pos), (lnum, pos), line)
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else: # continued statement
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if not line:
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raise TokenError, ("EOF in multi-line statement", (lnum, 0))
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continued = 0
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while pos < max:
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if pseudoprog.match(line, pos) > 0: # scan for tokens
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start, end = pseudoprog.regs[1]
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spos, epos, pos = (lnum, start), (lnum, end), end
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token, initial = line[start:end], line[start]
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if initial in namechars: # ordinary name
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tokeneater(NAME, token, spos, epos, line)
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elif initial in numchars \
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or (initial == '.' and token != '.'): # ordinary number
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tokeneater(NUMBER, token, spos, epos, line)
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elif initial in '\r\n':
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tokeneater(NEWLINE, token, spos, epos, line)
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elif initial == '#':
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tokeneater(COMMENT, token, spos, epos, line)
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elif initial == '\\': # continued stmt
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continued = 1
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elif token in ('\'\'\'', '"""'): # triple-quoted
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endprog = endprogs[token]
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if endprog.match(line, pos) >= 0: # all on one line
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pos = endprog.regs[0][1]
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token = line[start:pos]
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tokeneater(STRING, token, spos, (lnum, pos), line)
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else:
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strstart = (lnum, start) # multiple lines
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contstr = line[start:]
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break
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elif initial in '\'"':
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if token[-1] == '\n': # continued string
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strstart = (lnum, start)
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endprog = endprogs[initial]
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contstr, needcont = line[start:], 1
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break
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else: # ordinary string
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tokeneater(STRING, token, spos, epos, line)
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else:
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if initial in '([{': parenlev = parenlev + 1
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elif initial in ')]}': parenlev = parenlev - 1
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tokeneater(OP, token, spos, epos, line)
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else:
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tokeneater(ERRORTOKEN, line[pos],
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(lnum, pos), (lnum, pos+1), line)
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pos = pos + 1
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for indent in indents[1:]: # pop remaining indent levels
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tokeneater(DEDENT, '', (lnum, 0), (lnum, 0), '')
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tokeneater(ENDMARKER, '', (lnum, 0), (lnum, 0), '')
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if __name__ == '__main__': # testing
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import sys
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if len(sys.argv) > 1: tokenize(open(sys.argv[1]).readline)
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else: tokenize(sys.stdin.readline)
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