languages/cpython
languages/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython synced 2024-09-24 07:19:04 +00:00
Code Issues Packages Projects Releases Wiki Activity
cpython/Tools/idle/AutoIndent.py
Guido van Rossum 0fcd635d41 Tim Peters: 
+ Set usetabs=1.  Editing pyclbr.py was driving me nuts <0.6 wink>.
usetabs=1 is the Emacs pymode default too, and thanks to indentwidth !=
tabwidth magical usetabs disabling, new files are still created with tabs
turned off.  The only implication is that if you open a file whose first
indent is a single tab, IDLE will now magically use tabs for that file (and
set indentwidth to 8).  Note that the whole scheme doesn't work right for
PythonWin, though, since Windows users typically set tabwidth to 4; Mark
probably has to hide the IDLE algorithm from them (which he already knows).

+ Changed comment_region_event to stick "##" in front of every line.  The
"holes" previously left on blank lines were visually confusing (made it
needlessly hard to figure out what to uncomment later).
1999-06-08 12:54:23 +00:00

556 lines
20 KiB
Python
Raw Blame History

import string
#from Tkinter import TclError
#import tkMessageBox
#import tkSimpleDialog
# The default tab setting for a Text widget, in average-width characters.
TK_TABWIDTH_DEFAULT = 8
###$ event <<newline-and-indent>>
###$ win <Key-Return>
###$ win <KP_Enter>
###$ unix <Key-Return>
###$ unix <KP_Enter>
###$ event <<indent-region>>
###$ win <Control-bracketright>
###$ unix <Alt-bracketright>
###$ unix <Control-bracketright>
###$ event <<dedent-region>>
###$ win <Control-bracketleft>
###$ unix <Alt-bracketleft>
###$ unix <Control-bracketleft>
###$ event <<comment-region>>
###$ win <Alt-Key-3>
###$ unix <Alt-Key-3>
###$ event <<uncomment-region>>
###$ win <Alt-Key-4>
###$ unix <Alt-Key-4>
###$ event <<tabify-region>>
###$ win <Alt-Key-5>
###$ unix <Alt-Key-5>
###$ event <<untabify-region>>
###$ win <Alt-Key-6>
###$ unix <Alt-Key-6>
import PyParse
class AutoIndent:
menudefs = [
('edit', [
None,
('_Indent region', '<<indent-region>>'),
('_Dedent region', '<<dedent-region>>'),
('Comment _out region', '<<comment-region>>'),
('U_ncomment region', '<<uncomment-region>>'),
('Tabify region', '<<tabify-region>>'),
('Untabify region', '<<untabify-region>>'),
('Toggle tabs', '<<toggle-tabs>>'),
('New indent width', '<<change-indentwidth>>'),
]),
]
keydefs = {
'<<smart-backspace>>': ['<Key-BackSpace>'],
'<<newline-and-indent>>': ['<Key-Return>', '<KP_Enter>'],
'<<smart-indent>>': ['<Key-Tab>']
}
windows_keydefs = {
'<<indent-region>>': ['<Control-bracketright>'],
'<<dedent-region>>': ['<Control-bracketleft>'],
'<<comment-region>>': ['<Alt-Key-3>'],
'<<uncomment-region>>': ['<Alt-Key-4>'],
'<<tabify-region>>': ['<Alt-Key-5>'],
'<<untabify-region>>': ['<Alt-Key-6>'],
'<<toggle-tabs>>': ['<Alt-Key-t>'],
'<<change-indentwidth>>': ['<Alt-Key-u>'],
}
unix_keydefs = {
'<<indent-region>>': ['<Alt-bracketright>',
'<Meta-bracketright>',
'<Control-bracketright>'],
'<<dedent-region>>': ['<Alt-bracketleft>',
'<Meta-bracketleft>',
'<Control-bracketleft>'],
'<<comment-region>>': ['<Alt-Key-3>', '<Meta-Key-3>'],
'<<uncomment-region>>': ['<Alt-Key-4>', '<Meta-Key-4>'],
'<<tabify-region>>': ['<Alt-Key-5>', '<Meta-Key-5>'],
'<<untabify-region>>': ['<Alt-Key-6>', '<Meta-Key-6>'],
'<<toggle-tabs>>': ['<Alt-Key-t>'],
'<<change-indentwidth>>': ['<Alt-Key-u>'],
}
# usetabs true -> literal tab characters are used by indent and
# dedent cmds, possibly mixed with spaces if
# indentwidth is not a multiple of tabwidth
# false -> tab characters are converted to spaces by indent
# and dedent cmds, and ditto TAB keystrokes
# indentwidth is the number of characters per logical indent level.
# tabwidth is the display width of a literal tab character.
# CAUTION: telling Tk to use anything other than its default
# tab setting causes it to use an entirely different tabbing algorithm,
# treating tab stops as fixed distances from the left margin.
# Nobody expects this, so for now tabwidth should never be changed.
usetabs = 1
indentwidth = 4
tabwidth = TK_TABWIDTH_DEFAULT
# If context_use_ps1 is true, parsing searches back for a ps1 line;
# else searches for a popular (if, def, ...) Python stmt.
context_use_ps1 = 0
# When searching backwards for a reliable place to begin parsing,
# first start num_context_lines[0] lines back, then
# num_context_lines[1] lines back if that didn't work, and so on.
# The last value should be huge (larger than the # of lines in a
# conceivable file).
# Making the initial values larger slows things down more often.
num_context_lines = 50, 500, 5000000
def __init__(self, editwin):
self.editwin = editwin
self.text = editwin.text
def config(self, **options):
for key, value in options.items():
if key == 'usetabs':
self.usetabs = value
elif key == 'indentwidth':
self.indentwidth = value
elif key == 'tabwidth':
self.tabwidth = value
elif key == 'context_use_ps1':
self.context_use_ps1 = value
else:
raise KeyError, "bad option name: %s" % `key`
# If ispythonsource and guess are true, guess a good value for
# indentwidth based on file content (if possible), and if
# indentwidth != tabwidth set usetabs false.
# In any case, adjust the Text widget's view of what a tab
# character means.
def set_indentation_params(self, ispythonsource, guess=1):
text = self.text
if guess and ispythonsource:
i = self.guess_indent()
if 2 <= i <= 8:
self.indentwidth = i
if self.indentwidth != self.tabwidth:
self.usetabs = 0
current_tabs = text['tabs']
if current_tabs == "" and self.tabwidth == TK_TABWIDTH_DEFAULT:
pass
else:
# Reconfigure the Text widget by measuring the width
# of a tabwidth-length string in pixels, forcing the
# widget's tab stops to that.
need_tabs = text.tk.call("font", "measure", text['font'],
"-displayof", text.master,
"n" * self.tabwidth)
if current_tabs != need_tabs:
text.configure(tabs=need_tabs)
def smart_backspace_event(self, event):
text = self.text
try:
first = text.index("sel.first")
last = text.index("sel.last")
except: # Was catching TclError, but this doesnt work for
first = last = None
if first and last:
text.delete(first, last)
text.mark_set("insert", first)
return "break"
# If we're at the end of leading whitespace, nuke one indent
# level, else one character.
chars = text.get("insert linestart", "insert")
raw, effective = classifyws(chars, self.tabwidth)
if 0 < raw == len(chars):
if effective >= self.indentwidth:
self.reindent_to(effective - self.indentwidth)
return "break"
text.delete("insert-1c")
return "break"
def smart_indent_event(self, event):
# if intraline selection:
# delete it
# elif multiline selection:
# do indent-region & return
# indent one level
text = self.text
try:
first = text.index("sel.first")
last = text.index("sel.last")
except: # Was catching TclError, but this doesnt work for
first = last = None
text.undo_block_start()
try:
if first and last:
if index2line(first) != index2line(last):
return self.indent_region_event(event)
text.delete(first, last)
text.mark_set("insert", first)
prefix = text.get("insert linestart", "insert")
raw, effective = classifyws(prefix, self.tabwidth)
if raw == len(prefix):
# only whitespace to the left
self.reindent_to(effective + self.indentwidth)
else:
if self.usetabs:
pad = '\t'
else:
effective = len(string.expandtabs(prefix,
self.tabwidth))
n = self.indentwidth
pad = ' ' * (n - effective % n)
text.insert("insert", pad)
text.see("insert")
return "break"
finally:
text.undo_block_stop()
def newline_and_indent_event(self, event):
text = self.text
try:
first = text.index("sel.first")
last = text.index("sel.last")
except: # Was catching TclError, but this doesnt work for
first = last = None
text.undo_block_start()
try:
if first and last:
text.delete(first, last)
text.mark_set("insert", first)
line = text.get("insert linestart", "insert")
i, n = 0, len(line)
while i < n and line[i] in " \t":
i = i+1
if i == n:
# the cursor is in or at leading indentation; just inject
# an empty line at the start
text.insert("insert linestart", '\n')
return "break"
indent = line[:i]
# strip whitespace before insert point
i = 0
while line and line[-1] in " \t":
line = line[:-1]
i = i+1
if i:
text.delete("insert - %d chars" % i, "insert")
# strip whitespace after insert point
while text.get("insert") in " \t":
text.delete("insert")
# start new line
text.insert("insert", '\n')
# adjust indentation for continuations and block open/close
# first need to find the last stmt
lno = index2line(text.index('insert'))
y = PyParse.Parser(self.indentwidth, self.tabwidth)
for context in self.num_context_lines:
startat = max(lno - context, 1)
startatindex = `startat` + ".0"
rawtext = text.get(startatindex, "insert")
y.set_str(rawtext)
bod = y.find_good_parse_start(
self.context_use_ps1,
self._build_char_in_string_func(startatindex))
if bod is not None or startat == 1:
break
y.set_lo(bod or 0)
c = y.get_continuation_type()
if c != PyParse.C_NONE:
# The current stmt hasn't ended yet.
if c == PyParse.C_STRING:
# inside a string; just mimic the current indent
text.insert("insert", indent)
elif c == PyParse.C_BRACKET:
# line up with the first (if any) element of the
# last open bracket structure; else indent one
# level beyond the indent of the line with the last
# open bracket
self.reindent_to(y.compute_bracket_indent())
elif c == PyParse.C_BACKSLASH:
# if more than one line in this stmt already, just
# mimic the current indent; else if initial line has
# a start on an assignment stmt, indent to beyond
# leftmost =; else to beyond first chunk of non-
# whitespace on initial line
if y.get_num_lines_in_stmt() > 1:
text.insert("insert", indent)
else:
self.reindent_to(y.compute_backslash_indent())
else:
assert 0, "bogus continuation type " + `c`
return "break"
# This line starts a brand new stmt; indent relative to
# indentation of initial line of closest preceding interesting
# stmt.
indent = y.get_base_indent_string()
text.insert("insert", indent)
if y.is_block_opener():
self.smart_indent_event(event)
elif indent and y.is_block_closer():
self.smart_backspace_event(event)
return "break"
finally:
text.see("insert")
text.undo_block_stop()
auto_indent = newline_and_indent_event
# Our editwin provides a is_char_in_string function that works with
# a Tk text index, but PyParse only knows about offsets into a string.
# This builds a function for PyParse that accepts an offset.
def _build_char_in_string_func(self, startindex):
def inner(offset, _startindex=startindex,
_icis=self.editwin.is_char_in_string):
return _icis(_startindex + "+%dc" % offset)
return inner
def indent_region_event(self, event):
head, tail, chars, lines = self.get_region()
for pos in range(len(lines)):
line = lines[pos]
if line:
raw, effective = classifyws(line, self.tabwidth)
effective = effective + self.indentwidth
lines[pos] = self._make_blanks(effective) + line[raw:]
self.set_region(head, tail, chars, lines)
return "break"
def dedent_region_event(self, event):
head, tail, chars, lines = self.get_region()
for pos in range(len(lines)):
line = lines[pos]
if line:
raw, effective = classifyws(line, self.tabwidth)
effective = max(effective - self.indentwidth, 0)
lines[pos] = self._make_blanks(effective) + line[raw:]
self.set_region(head, tail, chars, lines)
return "break"
def comment_region_event(self, event):
head, tail, chars, lines = self.get_region()
for pos in range(len(lines)):
line = lines[pos]
lines[pos] = '##' + line
self.set_region(head, tail, chars, lines)
def uncomment_region_event(self, event):
head, tail, chars, lines = self.get_region()
for pos in range(len(lines)):
line = lines[pos]
if not line:
continue
if line[:2] == '##':
line = line[2:]
elif line[:1] == '#':
line = line[1:]
lines[pos] = line
self.set_region(head, tail, chars, lines)
def tabify_region_event(self, event):
head, tail, chars, lines = self.get_region()
tabwidth = self._asktabwidth()
for pos in range(len(lines)):
line = lines[pos]
if line:
raw, effective = classifyws(line, tabwidth)
ntabs, nspaces = divmod(effective, tabwidth)
lines[pos] = '\t' * ntabs + ' ' * nspaces + line[raw:]
self.set_region(head, tail, chars, lines)
def untabify_region_event(self, event):
head, tail, chars, lines = self.get_region()
tabwidth = self._asktabwidth()
for pos in range(len(lines)):
lines[pos] = string.expandtabs(lines[pos], tabwidth)
self.set_region(head, tail, chars, lines)
def toggle_tabs_event(self, event):
if self.editwin.askyesno(
"Toggle tabs",
"Turn tabs " + ("on", "off")[self.usetabs] + "?",
parent=self.text):
self.usetabs = not self.usetabs
return "break"
# XXX this isn't bound to anything -- see class tabwidth comments
def change_tabwidth_event(self, event):
new = self._asktabwidth()
if new != self.tabwidth:
self.tabwidth = new
self.set_indentation_params(0, guess=0)
return "break"
def change_indentwidth_event(self, event):
new = self.editwin.askinteger(
"Indent width",
"New indent width (1-16)",
parent=self.text,
initialvalue=self.indentwidth,
minvalue=1,
maxvalue=16)
if new and new != self.indentwidth:
self.indentwidth = new
return "break"
def get_region(self):
text = self.text
head = text.index("sel.first linestart")
tail = text.index("sel.last -1c lineend +1c")
if not (head and tail):
head = text.index("insert linestart")
tail = text.index("insert lineend +1c")
chars = text.get(head, tail)
lines = string.split(chars, "\n")
return head, tail, chars, lines
def set_region(self, head, tail, chars, lines):
text = self.text
newchars = string.join(lines, "\n")
if newchars == chars:
text.bell()
return
text.tag_remove("sel", "1.0", "end")
text.mark_set("insert", head)
text.undo_block_start()
text.delete(head, tail)
text.insert(head, newchars)
text.undo_block_stop()
text.tag_add("sel", head, "insert")
# Make string that displays as n leading blanks.
def _make_blanks(self, n):
if self.usetabs:
ntabs, nspaces = divmod(n, self.tabwidth)
return '\t' * ntabs + ' ' * nspaces
else:
return ' ' * n
# Delete from beginning of line to insert point, then reinsert
# column logical (meaning use tabs if appropriate) spaces.
def reindent_to(self, column):
text = self.text
text.undo_block_start()
if text.compare("insert linestart", "!=", "insert"):
text.delete("insert linestart", "insert")
if column:
text.insert("insert", self._make_blanks(column))
text.undo_block_stop()
def _asktabwidth(self):
return self.editwin.askinteger(
"Tab width",
"Spaces per tab?",
parent=self.text,
initialvalue=self.tabwidth,
minvalue=1,
maxvalue=16) or self.tabwidth
# Guess indentwidth from text content.
# Return guessed indentwidth. This should not be believed unless
# it's in a reasonable range (e.g., it will be 0 if no indented
# blocks are found).
def guess_indent(self):
opener, indented = IndentSearcher(self.text, self.tabwidth).run()
if opener and indented:
raw, indentsmall = classifyws(opener, self.tabwidth)
raw, indentlarge = classifyws(indented, self.tabwidth)
else:
indentsmall = indentlarge = 0
return indentlarge - indentsmall
# "line.col" -> line, as an int
def index2line(index):
return int(float(index))
# Look at the leading whitespace in s.
# Return pair (# of leading ws characters,
# effective # of leading blanks after expanding
# tabs to width tabwidth)
def classifyws(s, tabwidth):
raw = effective = 0
for ch in s:
if ch == ' ':
raw = raw + 1
effective = effective + 1
elif ch == '\t':
raw = raw + 1
effective = (effective / tabwidth + 1) * tabwidth
else:
break
return raw, effective
import tokenize
_tokenize = tokenize
del tokenize
class IndentSearcher:
# .run() chews over the Text widget, looking for a block opener
# and the stmt following it. Returns a pair,
# (line containing block opener, line containing stmt)
# Either or both may be None.
def __init__(self, text, tabwidth):
self.text = text
self.tabwidth = tabwidth
self.i = self.finished = 0
self.blkopenline = self.indentedline = None
def readline(self):
if self.finished:
return ""
i = self.i = self.i + 1
mark = `i` + ".0"
if self.text.compare(mark, ">=", "end"):
return ""
return self.text.get(mark, mark + " lineend+1c")
def tokeneater(self, type, token, start, end, line,
INDENT=_tokenize.INDENT,
NAME=_tokenize.NAME,
OPENERS=('class', 'def', 'for', 'if', 'try', 'while')):
if self.finished:
pass
elif type == NAME and token in OPENERS:
self.blkopenline = line
elif type == INDENT and self.blkopenline:
self.indentedline = line
self.finished = 1
def run(self):
save_tabsize = _tokenize.tabsize
_tokenize.tabsize = self.tabwidth
try:
try:
_tokenize.tokenize(self.readline, self.tokeneater)
except _tokenize.TokenError:
# since we cut off the tokenizer early, we can trigger
# spurious errors
pass
finally:
_tokenize.tabsize = save_tabsize
return self.blkopenline, self.indentedline
Reference in a new issue View git blame Copy permalink