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import sys
import tokenize
from pywin import default_scintilla_encoding
from . import PyParse
if sys.version_info < (3,):
# in py2k, tokenize() takes a 'token eater' callback, while
# generate_tokens is a generator that works with str objects.
token_generator = tokenize.generate_tokens
else:
# in py3k tokenize() is the generator working with 'byte' objects, and
# token_generator is the 'undocumented b/w compat' function that
# theoretically works with str objects - but actually seems to fail)
token_generator = tokenize.tokenize
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 = 8 # for IDLE use, must remain 8 until Tk is fixed
# 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" % repr(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):
if guess and ispythonsource:
i = self.guess_indent()
if 2 <= i <= 8:
self.indentwidth = i
if self.indentwidth != self.tabwidth:
self.usetabs = 0
self.editwin.set_tabwidth(self.tabwidth)
def smart_backspace_event(self, event):
text = self.text
first, last = self.editwin.get_selection_indices()
if first and last:
text.delete(first, last)
text.mark_set("insert", first)
return "break"
# Delete whitespace left, until hitting a real char or closest
# preceding virtual tab stop.
chars = text.get("insert linestart", "insert")
if chars == "":
if text.compare("insert", ">", "1.0"):
# easy: delete preceding newline
text.delete("insert-1c")
else:
text.bell() # at start of buffer
return "break"
if chars[-1] not in " \t":
# easy: delete preceding real char
text.delete("insert-1c")
return "break"
# Ick. It may require *inserting* spaces if we back up over a
# tab character! This is written to be clear, not fast.
have = len(chars.expandtabs(self.tabwidth))
assert have > 0
want = int((have - 1) / self.indentwidth) * self.indentwidth
ncharsdeleted = 0
while 1:
chars = chars[:-1]
ncharsdeleted = ncharsdeleted + 1
have = len(chars.expandtabs(self.tabwidth))
if have <= want or chars[-1] not in " \t":
break
text.undo_block_start()
text.delete("insert-%dc" % ncharsdeleted, "insert")
if have < want:
text.insert("insert", " " * (want - have))
text.undo_block_stop()
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
first, last = self.editwin.get_selection_indices()
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(prefix.expandtabs(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
first, last = self.editwin.get_selection_indices()
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 and strip space from current line
text.delete("insert - %d chars" % i, "insert")
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 = repr(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 " + repr(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) - 1):
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] = lines[pos].expandtabs(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
first, last = self.editwin.get_selection_indices()
if first and last:
head = text.index(first + " linestart")
tail = text.index(last + "-1c lineend +1c")
else:
head = text.index("insert linestart")
tail = text.index("insert lineend +1c")
chars = text.get(head, tail)
lines = chars.split("\n")
return head, tail, chars, lines
def set_region(self, head, tail, chars, lines):
text = self.text
newchars = "\n".join(lines)
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
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:
val = ""
else:
i = self.i = self.i + 1
mark = repr(i) + ".0"
if self.text.compare(mark, ">=", "end"):
val = ""
else:
val = self.text.get(mark, mark + " lineend+1c")
# hrm - not sure this is correct in py3k - the source code may have
# an encoding declared, but the data will *always* be in
# default_scintilla_encoding - so if anyone looks at the encoding decl
# in the source they will be wrong. I think. Maybe. Or something...
return val.encode(default_scintilla_encoding)
def run(self):
OPENERS = ("class", "def", "for", "if", "try", "while")
INDENT = tokenize.INDENT
NAME = tokenize.NAME
save_tabsize = tokenize.tabsize
tokenize.tabsize = self.tabwidth
try:
try:
for typ, token, start, end, line in token_generator(self.readline):
if typ == NAME and token in OPENERS:
self.blkopenline = line
elif typ == INDENT and self.blkopenline:
self.indentedline = line
break
except (tokenize.TokenError, IndentationError):
# since we cut off the tokenizer early, we can trigger
# spurious errors
pass
finally:
tokenize.tabsize = save_tabsize
return self.blkopenline, self.indentedline