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# -*- coding: utf-8 -*-
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"""
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Class and program to colorize python source code for ANSI terminals.
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Based on an HTML code highlighter by Jurgen Hermann found at:
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http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52298
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Modifications by Fernando Perez (fperez@colorado.edu).
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Information on the original HTML highlighter follows:
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MoinMoin - Python Source Parser
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Title: Colorize Python source using the built-in tokenizer
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Submitter: Jurgen Hermann
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Last Updated:2001/04/06
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Version no:1.2
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Description:
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This code is part of MoinMoin (http://moin.sourceforge.net/) and converts
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Python source code to HTML markup, rendering comments, keywords,
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operators, numeric and string literals in different colors.
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It shows how to use the built-in keyword, token and tokenize modules to
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scan Python source code and re-emit it with no changes to its original
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formatting (which is the hard part).
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"""
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from __future__ import print_function
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from __future__ import absolute_import
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from __future__ import unicode_literals
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__all__ = ['ANSICodeColors','Parser']
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_scheme_default = 'Linux'
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# Imports
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import keyword
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import os
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import sys
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import token
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import tokenize
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try:
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generate_tokens = tokenize.generate_tokens
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except AttributeError:
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# Python 3. Note that we use the undocumented _tokenize because it expects
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# strings, not bytes. See also Python issue #9969.
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generate_tokens = tokenize._tokenize
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from IPython.utils.coloransi import *
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from IPython.utils.py3compat import PY3
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if PY3:
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from io import StringIO
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else:
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from StringIO import StringIO
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#############################################################################
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### Python Source Parser (does Hilighting)
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#############################################################################
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_KEYWORD = token.NT_OFFSET + 1
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_TEXT = token.NT_OFFSET + 2
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#****************************************************************************
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# Builtin color schemes
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Colors = TermColors # just a shorthand
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# Build a few color schemes
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NoColor = ColorScheme(
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'NoColor',{
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token.NUMBER : Colors.NoColor,
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token.OP : Colors.NoColor,
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token.STRING : Colors.NoColor,
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tokenize.COMMENT : Colors.NoColor,
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token.NAME : Colors.NoColor,
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token.ERRORTOKEN : Colors.NoColor,
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_KEYWORD : Colors.NoColor,
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_TEXT : Colors.NoColor,
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'normal' : Colors.NoColor # color off (usu. Colors.Normal)
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} )
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LinuxColors = ColorScheme(
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'Linux',{
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token.NUMBER : Colors.LightCyan,
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token.OP : Colors.Yellow,
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token.STRING : Colors.LightBlue,
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tokenize.COMMENT : Colors.LightRed,
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token.NAME : Colors.Normal,
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token.ERRORTOKEN : Colors.Red,
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_KEYWORD : Colors.LightGreen,
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_TEXT : Colors.Yellow,
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'normal' : Colors.Normal # color off (usu. Colors.Normal)
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} )
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LightBGColors = ColorScheme(
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'LightBG',{
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token.NUMBER : Colors.Cyan,
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token.OP : Colors.Blue,
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token.STRING : Colors.Blue,
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tokenize.COMMENT : Colors.Red,
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token.NAME : Colors.Normal,
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token.ERRORTOKEN : Colors.Red,
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_KEYWORD : Colors.Green,
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_TEXT : Colors.Blue,
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'normal' : Colors.Normal # color off (usu. Colors.Normal)
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} )
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# Build table of color schemes (needed by the parser)
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ANSICodeColors = ColorSchemeTable([NoColor,LinuxColors,LightBGColors],
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_scheme_default)
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class Parser:
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""" Format colored Python source.
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"""
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def __init__(self, color_table=None,out = sys.stdout):
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""" Create a parser with a specified color table and output channel.
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Call format() to process code.
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"""
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self.color_table = color_table and color_table or ANSICodeColors
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self.out = out
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def format(self, raw, out = None, scheme = ''):
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return self.format2(raw, out, scheme)[0]
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def format2(self, raw, out = None, scheme = ''):
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""" Parse and send the colored source.
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If out and scheme are not specified, the defaults (given to
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constructor) are used.
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out should be a file-type object. Optionally, out can be given as the
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string 'str' and the parser will automatically return the output in a
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string."""
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string_output = 0
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if out == 'str' or self.out == 'str' or \
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isinstance(self.out,StringIO):
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# XXX - I don't really like this state handling logic, but at this
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# point I don't want to make major changes, so adding the
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# isinstance() check is the simplest I can do to ensure correct
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# behavior.
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out_old = self.out
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self.out = StringIO()
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string_output = 1
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elif out is not None:
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self.out = out
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# Fast return of the unmodified input for NoColor scheme
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if scheme == 'NoColor':
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error = False
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self.out.write(raw)
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if string_output:
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return raw,error
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else:
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return None,error
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# local shorthands
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colors = self.color_table[scheme].colors
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self.colors = colors # put in object so __call__ sees it
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# Remove trailing whitespace and normalize tabs
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self.raw = raw.expandtabs().rstrip()
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# store line offsets in self.lines
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self.lines = [0, 0]
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pos = 0
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raw_find = self.raw.find
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lines_append = self.lines.append
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while 1:
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pos = raw_find('\n', pos) + 1
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if not pos: break
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lines_append(pos)
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lines_append(len(self.raw))
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# parse the source and write it
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self.pos = 0
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text = StringIO(self.raw)
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error = False
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try:
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for atoken in generate_tokens(text.readline):
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self(*atoken)
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except tokenize.TokenError as ex:
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msg = ex.args[0]
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line = ex.args[1][0]
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self.out.write("%s\n\n*** ERROR: %s%s%s\n" %
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(colors[token.ERRORTOKEN],
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msg, self.raw[self.lines[line]:],
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colors.normal)
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)
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error = True
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self.out.write(colors.normal+'\n')
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if string_output:
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output = self.out.getvalue()
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self.out = out_old
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return (output, error)
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return (None, error)
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def __call__(self, toktype, toktext, start_pos, end_pos, line):
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""" Token handler, with syntax highlighting."""
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(srow,scol) = start_pos
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(erow,ecol) = end_pos
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colors = self.colors
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owrite = self.out.write
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# line separator, so this works across platforms
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linesep = os.linesep
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# calculate new positions
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oldpos = self.pos
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newpos = self.lines[srow] + scol
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self.pos = newpos + len(toktext)
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# send the original whitespace, if needed
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if newpos > oldpos:
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owrite(self.raw[oldpos:newpos])
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# skip indenting tokens
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if toktype in [token.INDENT, token.DEDENT]:
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self.pos = newpos
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return
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# map token type to a color group
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if token.LPAR <= toktype and toktype <= token.OP:
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toktype = token.OP
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elif toktype == token.NAME and keyword.iskeyword(toktext):
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toktype = _KEYWORD
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color = colors.get(toktype, colors[_TEXT])
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#print '<%s>' % toktext, # dbg
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# Triple quoted strings must be handled carefully so that backtracking
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# in pagers works correctly. We need color terminators on _each_ line.
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if linesep in toktext:
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toktext = toktext.replace(linesep, '%s%s%s' %
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(colors.normal,linesep,color))
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# send text
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owrite('%s%s%s' % (color,toktext,colors.normal))
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def main(argv=None):
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"""Run as a command-line script: colorize a python file or stdin using ANSI
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color escapes and print to stdout.
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Inputs:
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- argv(None): a list of strings like sys.argv[1:] giving the command-line
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arguments. If None, use sys.argv[1:].
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"""
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usage_msg = """%prog [options] [filename]
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Colorize a python file or stdin using ANSI color escapes and print to stdout.
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If no filename is given, or if filename is -, read standard input."""
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import optparse
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parser = optparse.OptionParser(usage=usage_msg)
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newopt = parser.add_option
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newopt('-s','--scheme',metavar='NAME',dest='scheme_name',action='store',
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choices=['Linux','LightBG','NoColor'],default=_scheme_default,
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help="give the color scheme to use. Currently only 'Linux'\
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(default) and 'LightBG' and 'NoColor' are implemented (give without\
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quotes)")
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opts,args = parser.parse_args(argv)
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if len(args) > 1:
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parser.error("you must give at most one filename.")
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if len(args) == 0:
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fname = '-' # no filename given; setup to read from stdin
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else:
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fname = args[0]
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if fname == '-':
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stream = sys.stdin
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else:
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try:
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stream = open(fname)
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except IOError as msg:
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print(msg, file=sys.stderr)
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sys.exit(1)
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parser = Parser()
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# we need nested try blocks because pre-2.5 python doesn't support unified
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# try-except-finally
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try:
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try:
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# write colorized version to stdout
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parser.format(stream.read(),scheme=opts.scheme_name)
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except IOError as msg:
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# if user reads through a pager and quits, don't print traceback
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if msg.args != (32,'Broken pipe'):
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raise
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finally:
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if stream is not sys.stdin:
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stream.close() # in case a non-handled exception happened above
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if __name__ == "__main__":
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main()
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