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# -*- coding: utf-8 -*-
"""
Class and program to colorize python source code for ANSI terminals.
Based on an HTML code highlighter by Jurgen Hermann found at:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52298
Modifications by Fernando Perez (fperez@colorado.edu).
Information on the original HTML highlighter follows:
MoinMoin - Python Source Parser
Title: Colorize Python source using the built-in tokenizer
Submitter: Jurgen Hermann
Last Updated:2001/04/06
Version no:1.2
Description:
This code is part of MoinMoin (http://moin.sourceforge.net/) and converts
Python source code to HTML markup, rendering comments, keywords,
operators, numeric and string literals in different colors.
It shows how to use the built-in keyword, token and tokenize modules to
scan Python source code and re-emit it with no changes to its original
formatting (which is the hard part).
"""
__all__ = ['ANSICodeColors','Parser']
_scheme_default = 'Linux'
# Imports
import keyword
import os
import sys
import token
import tokenize
generate_tokens = tokenize.generate_tokens
from IPython.utils.coloransi import TermColors, InputTermColors ,ColorScheme, ColorSchemeTable
from IPython.utils.py3compat import PY3
from .colorable import Colorable
if PY3:
from io import StringIO
else:
from StringIO import StringIO
#############################################################################
### Python Source Parser (does Hilighting)
#############################################################################
_KEYWORD = token.NT_OFFSET + 1
_TEXT = token.NT_OFFSET + 2
#****************************************************************************
# Builtin color schemes
Colors = TermColors # just a shorthand
# Build a few color schemes
NoColor = ColorScheme(
'NoColor',{
'header' : Colors.NoColor,
token.NUMBER : Colors.NoColor,
token.OP : Colors.NoColor,
token.STRING : Colors.NoColor,
tokenize.COMMENT : Colors.NoColor,
token.NAME : Colors.NoColor,
token.ERRORTOKEN : Colors.NoColor,
_KEYWORD : Colors.NoColor,
_TEXT : Colors.NoColor,
'in_prompt' : InputTermColors.NoColor, # Input prompt
'in_number' : InputTermColors.NoColor, # Input prompt number
'in_prompt2' : InputTermColors.NoColor, # Continuation prompt
'in_normal' : InputTermColors.NoColor, # color off (usu. Colors.Normal)
'out_prompt' : Colors.NoColor, # Output prompt
'out_number' : Colors.NoColor, # Output prompt number
'normal' : Colors.NoColor # color off (usu. Colors.Normal)
} )
LinuxColors = ColorScheme(
'Linux',{
'header' : Colors.LightRed,
token.NUMBER : Colors.LightCyan,
token.OP : Colors.Yellow,
token.STRING : Colors.LightBlue,
tokenize.COMMENT : Colors.LightRed,
token.NAME : Colors.Normal,
token.ERRORTOKEN : Colors.Red,
_KEYWORD : Colors.LightGreen,
_TEXT : Colors.Yellow,
'in_prompt' : InputTermColors.Green,
'in_number' : InputTermColors.LightGreen,
'in_prompt2' : InputTermColors.Green,
'in_normal' : InputTermColors.Normal, # color off (usu. Colors.Normal)
'out_prompt' : Colors.Red,
'out_number' : Colors.LightRed,
'normal' : Colors.Normal # color off (usu. Colors.Normal)
} )
NeutralColors = ColorScheme(
'Neutral',{
'header' : Colors.Red,
token.NUMBER : Colors.Cyan,
token.OP : Colors.Blue,
token.STRING : Colors.Blue,
tokenize.COMMENT : Colors.Red,
token.NAME : Colors.Normal,
token.ERRORTOKEN : Colors.Red,
_KEYWORD : Colors.Green,
_TEXT : Colors.Blue,
'in_prompt' : InputTermColors.Blue,
'in_number' : InputTermColors.LightBlue,
'in_prompt2' : InputTermColors.Blue,
'in_normal' : InputTermColors.Normal, # color off (usu. Colors.Normal)
'out_prompt' : Colors.Red,
'out_number' : Colors.LightRed,
'normal' : Colors.Normal # color off (usu. Colors.Normal)
} )
# Hack: the 'neutral' colours are not very visible on a dark background on
# Windows. Since Windows command prompts have a dark background by default, and
# relatively few users are likely to alter that, we will use the 'Linux' colours,
# designed for a dark background, as the default on Windows. Changing it here
# avoids affecting the prompt colours rendered by prompt_toolkit, where the
# neutral defaults do work OK.
if os.name == 'nt':
NeutralColors = LinuxColors.copy(name='Neutral')
LightBGColors = ColorScheme(
'LightBG',{
'header' : Colors.Red,
token.NUMBER : Colors.Cyan,
token.OP : Colors.Blue,
token.STRING : Colors.Blue,
tokenize.COMMENT : Colors.Red,
token.NAME : Colors.Normal,
token.ERRORTOKEN : Colors.Red,
_KEYWORD : Colors.Green,
_TEXT : Colors.Blue,
'in_prompt' : InputTermColors.Blue,
'in_number' : InputTermColors.LightBlue,
'in_prompt2' : InputTermColors.Blue,
'in_normal' : InputTermColors.Normal, # color off (usu. Colors.Normal)
'out_prompt' : Colors.Red,
'out_number' : Colors.LightRed,
'normal' : Colors.Normal # color off (usu. Colors.Normal)
} )
# Build table of color schemes (needed by the parser)
ANSICodeColors = ColorSchemeTable([NoColor,LinuxColors,LightBGColors, NeutralColors],
_scheme_default)
Undefined = object()
class Parser(Colorable):
""" Format colored Python source.
"""
def __init__(self, color_table=None, out = sys.stdout, parent=None, style=None):
""" Create a parser with a specified color table and output channel.
Call format() to process code.
"""
super(Parser, self).__init__(parent=parent)
self.color_table = color_table and color_table or ANSICodeColors
self.out = out
if not style:
self.style = self.default_style
else:
self.style = style
def format(self, raw, out=None, scheme=Undefined):
import warnings
if scheme is not Undefined:
warnings.warn('The `scheme` argument of IPython.utils.PyColorize:Parser.format is deprecated since IPython 6.0.'
'It will have no effect. Set the parser `style` directly.',
stacklevel=2)
return self.format2(raw, out)[0]
def format2(self, raw, out = None):
""" Parse and send the colored source.
If out and scheme are not specified, the defaults (given to
constructor) are used.
out should be a file-type object. Optionally, out can be given as the
string 'str' and the parser will automatically return the output in a
string."""
string_output = 0
if out == 'str' or self.out == 'str' or \
isinstance(self.out,StringIO):
# XXX - I don't really like this state handling logic, but at this
# point I don't want to make major changes, so adding the
# isinstance() check is the simplest I can do to ensure correct
# behavior.
out_old = self.out
self.out = StringIO()
string_output = 1
elif out is not None:
self.out = out
# Fast return of the unmodified input for NoColor scheme
if self.style == 'NoColor':
error = False
self.out.write(raw)
if string_output:
return raw,error
else:
return None,error
# local shorthands
colors = self.color_table[self.style].colors
self.colors = colors # put in object so __call__ sees it
# Remove trailing whitespace and normalize tabs
self.raw = raw.expandtabs().rstrip()
# store line offsets in self.lines
self.lines = [0, 0]
pos = 0
raw_find = self.raw.find
lines_append = self.lines.append
while 1:
pos = raw_find('\n', pos) + 1
if not pos: break
lines_append(pos)
lines_append(len(self.raw))
# parse the source and write it
self.pos = 0
text = StringIO(self.raw)
error = False
try:
for atoken in generate_tokens(text.readline):
self(*atoken)
except tokenize.TokenError as ex:
msg = ex.args[0]
line = ex.args[1][0]
self.out.write("%s\n\n*** ERROR: %s%s%s\n" %
(colors[token.ERRORTOKEN],
msg, self.raw[self.lines[line]:],
colors.normal)
)
error = True
self.out.write(colors.normal+'\n')
if string_output:
output = self.out.getvalue()
self.out = out_old
return (output, error)
return (None, error)
def __call__(self, toktype, toktext, start_pos, end_pos, line):
""" Token handler, with syntax highlighting."""
(srow,scol) = start_pos
(erow,ecol) = end_pos
colors = self.colors
owrite = self.out.write
# line separator, so this works across platforms
linesep = os.linesep
# calculate new positions
oldpos = self.pos
newpos = self.lines[srow] + scol
self.pos = newpos + len(toktext)
# send the original whitespace, if needed
if newpos > oldpos:
owrite(self.raw[oldpos:newpos])
# skip indenting tokens
if toktype in [token.INDENT, token.DEDENT]:
self.pos = newpos
return
# map token type to a color group
if token.LPAR <= toktype <= token.OP:
toktype = token.OP
elif toktype == token.NAME and keyword.iskeyword(toktext):
toktype = _KEYWORD
color = colors.get(toktype, colors[_TEXT])
#print '<%s>' % toktext, # dbg
# Triple quoted strings must be handled carefully so that backtracking
# in pagers works correctly. We need color terminators on _each_ line.
if linesep in toktext:
toktext = toktext.replace(linesep, '%s%s%s' %
(colors.normal,linesep,color))
# send text
owrite('%s%s%s' % (color,toktext,colors.normal))
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