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hilightedWriter.py
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hilightedWriter.py
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# Copyright Tobias Gruen 2016
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
# Note:
# The windows terminal has introduced support ASCII escape-sequences in windows 10.
# Colors can't be displayed before Window 10.
import re, os, platform
import sys
_highlictColorDict = {
"black": (30, None),
"bright-black": (30, 1),
"red": (31, None),
"bright-red": (31, 1),
"green": (32, None),
"bright-green": (32, 1),
"yellow": (33, None),
"bright-yellow": (33, 1),
"blue": (34, None),
"bright-blue": (34, 1),
"magenta": (35, None),
"bright-magenta":(35, 1),
"cyan": (36, None),
"bright-cyan": (36, 1),
"white": (37, None),
"bright-white": (37, 1),
}
def _isHighlighterRegex(txt, wordMatchRegex):
return re.match(wordMatchRegex, txt) is None
def safe_cast(val, to_type, default=None):
try:
return to_type(val)
except ValueError:
return default
def streamSupportsColor(stream):
"""
Returns True if the stream goes to a terminal that supports color
"""
isAtty = hasattr(stream, "isatty") and stream.isatty()
system = platform.system()
revision = safe_cast("a"+platform.release(), int, 0)
if isAtty:
if not (system == "Windows" and revision < 10):
return True
return False
class HighlightedWriter:
"""
Adds terminal color-escape-sequences to the output text, according to a highlighting dictionary.
The Highlighting dictionary distinguishs between
- non-regex strings, they are only highlighted if they match a whole word
- regex strings
Color mapping keys are considered as a Regex, if the wordMatchRegex doesn't match the key string.
"""
# A dictionary that contains all the non regex matches.
wordsColorMap = {}
# A dictionary with the regex names and their color.
regexColorMap = {}
# The print output stream, to this stream will be written.
flushAfterWrite = True
outputStream = sys.stdout
highlight = False
def __init__(self, outputStream, colorMapping, flushAfterWrite = True, colorMode = "auto", wordMatchRegex=r"[a-zA-Z_][\w_]*"):
"""
outputStream = the stream where the colorized Text goes
colorMapping = a dictionary consisting of keyword/captureRegex (key) to color (value) items eg. {"for":"bright-blue", "while":"red", "//.*":"green"}
Available colors are: "black", "red", "green", "yellow", "blue", "magenta", "cyan", "white" and the same colors in "bright-{colorname}" variants.
implemention detail: all the regex expressions are combined into one single regex (so if modifiers are applied to a key they have to be undone at the end of the regex):
e.g. "(?i)...(?-i)" or simply "(?i:...)"
flushAfterWrite = if True, flush() is called at the stream after writing.
colorMode = one of ("auto", "on", "off"). If color mode is auto it enables colors, if the output stream is a console that supports colors.
wordMatchRegex = the regex to match the non-regex matches
"""
self.outputStream = outputStream
if colorMode == "auto":
self.highlight = streamSupportsColor(self.outputStream)
elif colorMode == "on":
self.highlight = True
elif colorMode == "off":
self.highlight = False
else:
raise Exception("Unsupported color mode")
self.wordsColorMap = dict(filter(lambda x: not _isHighlighterRegex(x[0], wordMatchRegex), colorMapping.items()))
regexMappings = list(filter(lambda x: _isHighlighterRegex(x[0], wordMatchRegex), colorMapping.items()))
regexes = []
for n, r in enumerate(regexMappings):
# Try to compile the single regexes (syntax only check)
re.compile(r[0])
groupName = "g_"+str(n)
# associate the color, with a generated regex group name
self.regexColorMap[groupName] = r[1]
regexes.append("(?P<%s>%s)"%(groupName, r[0]))
regexes.append("(?P<g_word>%s)"%(wordMatchRegex))
combinedRegex = "|".join(regexes)
self.regex = re.compile(combinedRegex)
def _highlight(self, txt, color):
colorEntry = _highlictColorDict.get(color, None)
if colorEntry:
if colorEntry[1] is None:
return "\x1B[%dm%s\x1B[0m"%(colorEntry[0], txt)
else:
return "\x1B[%d;%dm%s\x1B[0m"%(colorEntry[0], colorEntry[1], txt)
else:
return txt
def _createHighlightedText(self, txt):
if self.regex is None:
return txt
highlight = self._highlight
outtxt = ""
lastend = 0
for m in re.finditer(self.regex, txt):
outtxt += txt[lastend:m.start()]
lastend = m.end()
foundGroup=""
if m.lastgroup and m.lastgroup.startswith("g_"):
foundGroup=m.lastgroup;
color = ""
if foundGroup == "g_word":
color = self.wordsColorMap.get(m.group(0),"")
outtxt += highlight(m.group(0), color)
else:
color = self.regexColorMap.get(foundGroup, "")
outtxt += highlight(m.group(0), color)
outtxt += txt[lastend:]
return outtxt
def write(self, txt):
if(self.highlight):
txt = self._createHighlightedText(txt)
self.outputStream.write(txt)
if self.flushAfterWrite:
self.outputStream.flush()
def writeln(self, txt):
self.write(txt+'\n')
def flush():
if self.outputStream:
self.outputStream.flush()
def _highlightedWriterTest():
kwds = """ and del from not while as elif global or with
assert else if pass yield break except import print
class exec in raise continue finally is return
def for lambda try """
wordColorDict = {
"#.*" : "green" # comments...
,"'''([^']|'{1,2})*?'''|r'[^']*'|'([^\\']|\\\\.)*'" : "bright-green" # 'strings'
,'"""([^"]|"{1,2})*?"""|r"[^"]*"|"(\\\\.|[^\\\\"])*"' : "bright-green" # "strings"
,r"(\d+(\.\d+(e[+-]?\d+)?)?)|(\.\d+(e[+-]?\d+)?)" : "red" # numbers, fp-literals
}
# Add the keywords to the dictionary (e.g. "and" : "bright-blue")
for kw in re.finditer("\w+", kwds):
wordColorDict[kw.group(0)] = "bright-blue"
# Initialize the HighlightedWriter
w = HighlightedWriter(sys.stdout, wordColorDict, colorMode="auto")
#Print itself
f = open(__file__, "r")
w.write(f.read())