colorizer.py
import builtins
import keyword
import re
import time
from idlelib.config import idleConf
from idlelib.delegator import Delegator
DEBUG = False
def any(name, alternates):
"Return a named group pattern matching list of alternates."
return "(?P<%s>" % name + "|".join(alternates) + ")"
def make_pat():
kw = r"\b" + any("KEYWORD", keyword.kwlist) + r"\b"
match_softkw = (
r"^[ \t]*" + # at beginning of line + possible indentation
r"(?P<MATCH_SOFTKW>match)\b" +
r"(?![ \t]*(?:" + "|".join([ # not followed by ...
r"[:,;=^&|@~)\]}]", # a character which means it can't be a
# pattern-matching statement
r"\b(?:" + r"|".join(keyword.kwlist) + r")\b", # a keyword
]) +
r"))"
)
case_default = (
r"^[ \t]*" + # at beginning of line + possible indentation
r"(?P<CASE_SOFTKW>case)" +
r"[ \t]+(?P<CASE_DEFAULT_UNDERSCORE>_\b)"
)
case_softkw_and_pattern = (
r"^[ \t]*" + # at beginning of line + possible indentation
r"(?P<CASE_SOFTKW2>case)\b" +
r"(?![ \t]*(?:" + "|".join([ # not followed by ...
r"_\b", # a lone underscore
r"[:,;=^&|@~)\]}]", # a character which means it can't be a
# pattern-matching case
r"\b(?:" + r"|".join(keyword.kwlist) + r")\b", # a keyword
]) +
r"))"
)
builtinlist = [str(name) for name in dir(builtins)
if not name.startswith('_') and
name not in keyword.kwlist]
builtin = r"([^.'\"\\#]\b|^)" + any("BUILTIN", builtinlist) + r"\b"
comment = any("COMMENT", [r"#[^\n]*"])
stringprefix = r"(?i:r|u|f|fr|rf|b|br|rb)?"
sqstring = stringprefix + r"'[^'\\\n]*(\\.[^'\\\n]*)*'?"
dqstring = stringprefix + r'"[^"\\\n]*(\\.[^"\\\n]*)*"?'
sq3string = stringprefix + r"'''[^'\\]*((\\.|'(?!''))[^'\\]*)*(''')?"
dq3string = stringprefix + r'"""[^"\\]*((\\.|"(?!""))[^"\\]*)*(""")?'
string = any("STRING", [sq3string, dq3string, sqstring, dqstring])
prog = re.compile("|".join([
builtin, comment, string, kw,
match_softkw, case_default,
case_softkw_and_pattern,
any("SYNC", [r"\n"]),
]),
re.DOTALL | re.MULTILINE)
return prog
prog = make_pat()
idprog = re.compile(r"\s+(\w+)")
prog_group_name_to_tag = {
"MATCH_SOFTKW": "KEYWORD",
"CASE_SOFTKW": "KEYWORD",
"CASE_DEFAULT_UNDERSCORE": "KEYWORD",
"CASE_SOFTKW2": "KEYWORD",
}
def matched_named_groups(re_match):
"Get only the non-empty named groups from an re.Match object."
return ((k, v) for (k, v) in re_match.groupdict().items() if v)
def color_config(text):
"""Set color options of Text widget.
If ColorDelegator is used, this should be called first.
"""
# Called from htest, TextFrame, Editor, and Turtledemo.
# Not automatic because ColorDelegator does not know 'text'.
theme = idleConf.CurrentTheme()
normal_colors = idleConf.GetHighlight(theme, 'normal')
cursor_color = idleConf.GetHighlight(theme, 'cursor')['foreground']
select_colors = idleConf.GetHighlight(theme, 'hilite')
text.config(
foreground=normal_colors['foreground'],
background=normal_colors['background'],
insertbackground=cursor_color,
selectforeground=select_colors['foreground'],
selectbackground=select_colors['background'],
inactiveselectbackground=select_colors['background'], # new in 8.5
)
class ColorDelegator(Delegator):
"""Delegator for syntax highlighting (text coloring).
Instance variables:
delegate: Delegator below this one in the stack, meaning the
one this one delegates to.
Used to track state:
after_id: Identifier for scheduled after event, which is a
timer for colorizing the text.
allow_colorizing: Boolean toggle for applying colorizing.
colorizing: Boolean flag when colorizing is in process.
stop_colorizing: Boolean flag to end an active colorizing
process.
"""
def __init__(self):
Delegator.__init__(self)
self.init_state()
self.prog = prog
self.idprog = idprog
self.LoadTagDefs()
def init_state(self):
"Initialize variables that track colorizing state."
self.after_id = None
self.allow_colorizing = True
self.stop_colorizing = False
self.colorizing = False
def setdelegate(self, delegate):
"""Set the delegate for this instance.
A delegate is an instance of a Delegator class and each
delegate points to the next delegator in the stack. This
allows multiple delegators to be chained together for a
widget. The bottom delegate for a colorizer is a Text
widget.
If there is a delegate, also start the colorizing process.
"""
if self.delegate is not None:
self.unbind("<<toggle-auto-coloring>>")
Delegator.setdelegate(self, delegate)
if delegate is not None:
self.config_colors()
self.bind("<<toggle-auto-coloring>>", self.toggle_colorize_event)
self.notify_range("1.0", "end")
else:
# No delegate - stop any colorizing.
self.stop_colorizing = True
self.allow_colorizing = False
def config_colors(self):
"Configure text widget tags with colors from tagdefs."
for tag, cnf in self.tagdefs.items():
self.tag_configure(tag, **cnf)
self.tag_raise('sel')
def LoadTagDefs(self):
"Create dictionary of tag names to text colors."
theme = idleConf.CurrentTheme()
self.tagdefs = {
"COMMENT": idleConf.GetHighlight(theme, "comment"),
"KEYWORD": idleConf.GetHighlight(theme, "keyword"),
"BUILTIN": idleConf.GetHighlight(theme, "builtin"),
"STRING": idleConf.GetHighlight(theme, "string"),
"DEFINITION": idleConf.GetHighlight(theme, "definition"),
"SYNC": {'background': None, 'foreground': None},
"TODO": {'background': None, 'foreground': None},
"ERROR": idleConf.GetHighlight(theme, "error"),
# "hit" is used by ReplaceDialog to mark matches. It shouldn't be changed by Colorizer, but
# that currently isn't technically possible. This should be moved elsewhere in the future
# when fixing the "hit" tag's visibility, or when the replace dialog is replaced with a
# non-modal alternative.
"hit": idleConf.GetHighlight(theme, "hit"),
}
if DEBUG: print('tagdefs', self.tagdefs)
def insert(self, index, chars, tags=None):
"Insert chars into widget at index and mark for colorizing."
index = self.index(index)
self.delegate.insert(index, chars, tags)
self.notify_range(index, index + "+%dc" % len(chars))
def delete(self, index1, index2=None):
"Delete chars between indexes and mark for colorizing."
index1 = self.index(index1)
self.delegate.delete(index1, index2)
self.notify_range(index1)
def notify_range(self, index1, index2=None):
"Mark text changes for processing and restart colorizing, if active."
self.tag_add("TODO", index1, index2)
if self.after_id:
if DEBUG: print("colorizing already scheduled")
return
if self.colorizing:
self.stop_colorizing = True
if DEBUG: print("stop colorizing")
if self.allow_colorizing:
if DEBUG: print("schedule colorizing")
self.after_id = self.after(1, self.recolorize)
return
def close(self):
if self.after_id:
after_id = self.after_id
self.after_id = None
if DEBUG: print("cancel scheduled recolorizer")
self.after_cancel(after_id)
self.allow_colorizing = False
self.stop_colorizing = True
def toggle_colorize_event(self, event=None):
"""Toggle colorizing on and off.
When toggling off, if colorizing is scheduled or is in
process, it will be cancelled and/or stopped.
When toggling on, colorizing will be scheduled.
"""
if self.after_id:
after_id = self.after_id
self.after_id = None
if DEBUG: print("cancel scheduled recolorizer")
self.after_cancel(after_id)
if self.allow_colorizing and self.colorizing:
if DEBUG: print("stop colorizing")
self.stop_colorizing = True
self.allow_colorizing = not self.allow_colorizing
if self.allow_colorizing and not self.colorizing:
self.after_id = self.after(1, self.recolorize)
if DEBUG:
print("auto colorizing turned",
"on" if self.allow_colorizing else "off")
return "break"
def recolorize(self):
"""Timer event (every 1ms) to colorize text.
Colorizing is only attempted when the text widget exists,
when colorizing is toggled on, and when the colorizing
process is not already running.
After colorizing is complete, some cleanup is done to
make sure that all the text has been colorized.
"""
self.after_id = None
if not self.delegate:
if DEBUG: print("no delegate")
return
if not self.allow_colorizing:
if DEBUG: print("auto colorizing is off")
return
if self.colorizing:
if DEBUG: print("already colorizing")
return
try:
self.stop_colorizing = False
self.colorizing = True
if DEBUG: print("colorizing...")
t0 = time.perf_counter()
self.recolorize_main()
t1 = time.perf_counter()
if DEBUG: print("%.3f seconds" % (t1-t0))
finally:
self.colorizing = False
if self.allow_colorizing and self.tag_nextrange("TODO", "1.0"):
if DEBUG: print("reschedule colorizing")
self.after_id = self.after(1, self.recolorize)
def recolorize_main(self):
"Evaluate text and apply colorizing tags."
next = "1.0"
while todo_tag_range := self.tag_nextrange("TODO", next):
self.tag_remove("SYNC", todo_tag_range[0], todo_tag_range[1])
sync_tag_range = self.tag_prevrange("SYNC", todo_tag_range[0])
head = sync_tag_range[1] if sync_tag_range else "1.0"
chars = ""
next = head
lines_to_get = 1
ok = False
while not ok:
mark = next
next = self.index(mark + "+%d lines linestart" %
lines_to_get)
lines_to_get = min(lines_to_get * 2, 100)
ok = "SYNC" in self.tag_names(next + "-1c")
line = self.get(mark, next)
##print head, "get", mark, next, "->", repr(line)
if not line:
return
for tag in self.tagdefs:
self.tag_remove(tag, mark, next)
chars += line
self._add_tags_in_section(chars, head)
if "SYNC" in self.tag_names(next + "-1c"):
head = next
chars = ""
else:
ok = False
if not ok:
# We're in an inconsistent state, and the call to
# update may tell us to stop. It may also change
# the correct value for "next" (since this is a
# line.col string, not a true mark). So leave a
# crumb telling the next invocation to resume here
# in case update tells us to leave.
self.tag_add("TODO", next)
self.update_idletasks()
if self.stop_colorizing:
if DEBUG: print("colorizing stopped")
return
def _add_tag(self, start, end, head, matched_group_name):
"""Add a tag to a given range in the text widget.
This is a utility function, receiving the range as `start` and
`end` positions, each of which is a number of characters
relative to the given `head` index in the text widget.
The tag to add is determined by `matched_group_name`, which is
the name of a regular expression "named group" as matched by
by the relevant highlighting regexps.
"""
tag = prog_group_name_to_tag.get(matched_group_name,
matched_group_name)
self.tag_add(tag,
f"{head}+{start:d}c",
f"{head}+{end:d}c")
def _add_tags_in_section(self, chars, head):
"""Parse and add highlighting tags to a given part of the text.
`chars` is a string with the text to parse and to which
highlighting is to be applied.
`head` is the index in the text widget where the text is found.
"""
for m in self.prog.finditer(chars):
for name, matched_text in matched_named_groups(m):
a, b = m.span(name)
self._add_tag(a, b, head, name)
if matched_text in ("def", "class"):
if m1 := self.idprog.match(chars, b):
a, b = m1.span(1)
self._add_tag(a, b, head, "DEFINITION")
def removecolors(self):
"Remove all colorizing tags."
for tag in self.tagdefs:
self.tag_remove(tag, "1.0", "end")
def _color_delegator(parent): # htest #
from tkinter import Toplevel, Text
from idlelib.idle_test.test_colorizer import source
from idlelib.percolator import Percolator
top = Toplevel(parent)
top.title("Test ColorDelegator")
x, y = map(int, parent.geometry().split('+')[1:])
top.geometry("700x550+%d+%d" % (x + 20, y + 175))
text = Text(top, background="white")
text.pack(expand=1, fill="both")
text.insert("insert", source)
text.focus_set()
color_config(text)
p = Percolator(text)
d = ColorDelegator()
p.insertfilter(d)
if __name__ == "__main__":
from unittest import main
main('idlelib.idle_test.test_colorizer', verbosity=2, exit=False)
from idlelib.idle_test.htest import run
run(_color_delegator)
