| """Tokenization help for Python programs. |
| |
| This module exports a function called 'tokenize()' that breaks a stream of |
| text into Python tokens. It accepts a readline-like method which is called |
| repeatedly to get the next line of input (or "" for EOF) and a "token-eater" |
| function which is called once for each token found. The latter function is |
| passed the token type, a string containing the token, the starting and |
| ending (row, column) coordinates of the token, and the original line. It is |
| designed to match the working of the Python tokenizer exactly, except that |
| it produces COMMENT tokens for comments and gives type OP for all operators.""" |
| |
| __version__ = "Ka-Ping Yee, 26 October 1997; patched, GvR 3/30/98" |
| |
| import string, re |
| from token import * |
| |
| COMMENT = N_TOKENS |
| tok_name[COMMENT] = 'COMMENT' |
| NL = N_TOKENS + 1 |
| tok_name[NL] = 'NL' |
| |
| |
| # Changes from 1.3: |
| # Ignore now accepts \f as whitespace. Operator now includes '**'. |
| # Ignore and Special now accept \n or \r\n at the end of a line. |
| # Imagnumber is new. Expfloat is corrected to reject '0e4'. |
| # Note: to quote a backslash in a regex, it must be doubled in a r'aw' string. |
| |
| def group(*choices): return '(' + string.join(choices, '|') + ')' |
| def any(*choices): return apply(group, choices) + '*' |
| def maybe(*choices): return apply(group, choices) + '?' |
| |
| Whitespace = r'[ \f\t]*' |
| Comment = r'#[^\r\n]*' |
| Ignore = Whitespace + any(r'\\\r?\n' + Whitespace) + maybe(Comment) |
| Name = r'[a-zA-Z_]\w*' |
| |
| Hexnumber = r'0[xX][\da-fA-F]*[lL]?' |
| Octnumber = r'0[0-7]*[lL]?' |
| Decnumber = r'[1-9]\d*[lL]?' |
| Intnumber = group(Hexnumber, Octnumber, Decnumber) |
| Exponent = r'[eE][-+]?\d+' |
| Pointfloat = group(r'\d+\.\d*', r'\.\d+') + maybe(Exponent) |
| Expfloat = r'[1-9]\d*' + Exponent |
| Floatnumber = group(Pointfloat, Expfloat) |
| Imagnumber = group(r'0[jJ]', r'[1-9]\d*[jJ]', Floatnumber + r'[jJ]') |
| Number = group(Imagnumber, Floatnumber, Intnumber) |
| |
| Single = any(r"[^'\\]", r'\\.') + "'" |
| Double = any(r'[^"\\]', r'\\.') + '"' |
| Single3 = any(r"[^'\\]",r'\\.',r"'[^'\\]",r"'\\.",r"''[^'\\]",r"''\\.") + "'''" |
| Double3 = any(r'[^"\\]',r'\\.',r'"[^"\\]',r'"\\.',r'""[^"\\]',r'""\\.') + '"""' |
| Triple = group("[rR]?'''", '[rR]?"""') |
| String = group("[rR]?'" + any(r"[^\n'\\]", r'\\.') + "'", |
| '[rR]?"' + any(r'[^\n"\\]', r'\\.') + '"') |
| |
| Operator = group('\+=', '\-=', '\*=', '%=', '/=', '\*\*=', '&=', '\|=', |
| '\^=', '>>=', '<<=', '\+', '\-', '\*\*', '\*', '\^', '~', |
| '/', '%', '&', '\|', '<<', '>>', '==', '<=', '<>', '!=', |
| '>=', '=', '<', '>') |
| |
| Bracket = '[][(){}]' |
| Special = group(r'\r?\n', r'[:;.,`]') |
| Funny = group(Operator, Bracket, Special) |
| |
| PlainToken = group(Number, Funny, String, Name) |
| Token = Ignore + PlainToken |
| |
| ContStr = group("[rR]?'" + any(r'\\.', r"[^\n'\\]") + group("'", r'\\\r?\n'), |
| '[rR]?"' + any(r'\\.', r'[^\n"\\]') + group('"', r'\\\r?\n')) |
| PseudoExtras = group(r'\\\r?\n', Comment, Triple) |
| PseudoToken = Whitespace + group(PseudoExtras, Number, Funny, ContStr, Name) |
| |
| tokenprog, pseudoprog, single3prog, double3prog = map( |
| re.compile, (Token, PseudoToken, Single3, Double3)) |
| endprogs = {"'": re.compile(Single), '"': re.compile(Double), |
| "'''": single3prog, '"""': double3prog, |
| "r'''": single3prog, 'r"""': double3prog, |
| "R'''": single3prog, 'R"""': double3prog, 'r': None, 'R': None} |
| |
| tabsize = 8 |
| |
| class TokenError(Exception): |
| pass |
| |
| def printtoken(type, token, (srow, scol), (erow, ecol), line): # for testing |
| print "%d,%d-%d,%d:\t%s\t%s" % \ |
| (srow, scol, erow, ecol, tok_name[type], repr(token)) |
| |
| def tokenize(readline, tokeneater=printtoken): |
| lnum = parenlev = continued = 0 |
| namechars, numchars = string.letters + '_', string.digits |
| contstr, needcont = '', 0 |
| contline = None |
| indents = [0] |
| |
| while 1: # loop over lines in stream |
| line = readline() |
| lnum = lnum + 1 |
| pos, max = 0, len(line) |
| |
| if contstr: # continued string |
| if not line: |
| raise TokenError, ("EOF in multi-line string", strstart) |
| endmatch = endprog.match(line) |
| if endmatch: |
| pos = end = endmatch.end(0) |
| tokeneater(STRING, contstr + line[:end], |
| strstart, (lnum, end), contline + line) |
| contstr, needcont = '', 0 |
| contline = None |
| elif needcont and line[-2:] != '\\\n' and line[-3:] != '\\\r\n': |
| tokeneater(ERRORTOKEN, contstr + line, |
| strstart, (lnum, len(line)), contline) |
| contstr = '' |
| contline = None |
| continue |
| else: |
| contstr = contstr + line |
| contline = contline + line |
| continue |
| |
| elif parenlev == 0 and not continued: # new statement |
| if not line: break |
| column = 0 |
| while pos < max: # measure leading whitespace |
| if line[pos] == ' ': column = column + 1 |
| elif line[pos] == '\t': column = (column/tabsize + 1)*tabsize |
| elif line[pos] == '\f': column = 0 |
| else: break |
| pos = pos + 1 |
| if pos == max: break |
| |
| if line[pos] in '#\r\n': # skip comments or blank lines |
| tokeneater((NL, COMMENT)[line[pos] == '#'], line[pos:], |
| (lnum, pos), (lnum, len(line)), line) |
| continue |
| |
| if column > indents[-1]: # count indents or dedents |
| indents.append(column) |
| tokeneater(INDENT, line[:pos], (lnum, 0), (lnum, pos), line) |
| while column < indents[-1]: |
| indents = indents[:-1] |
| tokeneater(DEDENT, '', (lnum, pos), (lnum, pos), line) |
| |
| else: # continued statement |
| if not line: |
| raise TokenError, ("EOF in multi-line statement", (lnum, 0)) |
| continued = 0 |
| |
| while pos < max: |
| pseudomatch = pseudoprog.match(line, pos) |
| if pseudomatch: # scan for tokens |
| start, end = pseudomatch.span(1) |
| spos, epos, pos = (lnum, start), (lnum, end), end |
| token, initial = line[start:end], line[start] |
| |
| if initial in numchars \ |
| or (initial == '.' and token != '.'): # ordinary number |
| tokeneater(NUMBER, token, spos, epos, line) |
| elif initial in '\r\n': |
| tokeneater(parenlev > 0 and NL or NEWLINE, |
| token, spos, epos, line) |
| elif initial == '#': |
| tokeneater(COMMENT, token, spos, epos, line) |
| elif token in ("'''", '"""', # triple-quoted |
| "r'''", 'r"""', "R'''", 'R"""'): |
| endprog = endprogs[token] |
| endmatch = endprog.match(line, pos) |
| if endmatch: # all on one line |
| pos = endmatch.end(0) |
| token = line[start:pos] |
| tokeneater(STRING, token, spos, (lnum, pos), line) |
| else: |
| strstart = (lnum, start) # multiple lines |
| contstr = line[start:] |
| contline = line |
| break |
| elif initial in ("'", '"') or \ |
| token[:2] in ("r'", 'r"', "R'", 'R"'): |
| if token[-1] == '\n': # continued string |
| strstart = (lnum, start) |
| endprog = endprogs[initial] or endprogs[token[1]] |
| contstr, needcont = line[start:], 1 |
| contline = line |
| break |
| else: # ordinary string |
| tokeneater(STRING, token, spos, epos, line) |
| elif initial in namechars: # ordinary name |
| tokeneater(NAME, token, spos, epos, line) |
| elif initial == '\\': # continued stmt |
| continued = 1 |
| else: |
| if initial in '([{': parenlev = parenlev + 1 |
| elif initial in ')]}': parenlev = parenlev - 1 |
| tokeneater(OP, token, spos, epos, line) |
| else: |
| tokeneater(ERRORTOKEN, line[pos], |
| (lnum, pos), (lnum, pos+1), line) |
| pos = pos + 1 |
| |
| for indent in indents[1:]: # pop remaining indent levels |
| tokeneater(DEDENT, '', (lnum, 0), (lnum, 0), '') |
| tokeneater(ENDMARKER, '', (lnum, 0), (lnum, 0), '') |
| |
| if __name__ == '__main__': # testing |
| import sys |
| if len(sys.argv) > 1: tokenize(open(sys.argv[1]).readline) |
| else: tokenize(sys.stdin.readline) |
| |