cpython/Lib/idlelib/FormatParagraph.py

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# Extension to format a paragraph
# Does basic, standard text formatting, and also understands Python
# comment blocks. Thus, for editing Python source code, this
# extension is really only suitable for reformatting these comment
# blocks or triple-quoted strings.
# Known problems with comment reformatting:
# * If there is a selection marked, and the first line of the
# selection is not complete, the block will probably not be detected
# as comments, and will have the normal "text formatting" rules
# applied.
# * If a comment block has leading whitespace that mixes tabs and
# spaces, they will not be considered part of the same block.
# * Fancy comments, like this bulleted list, arent handled :-)
import re
from idlelib.configHandler import idleConf
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class FormatParagraph:
menudefs = [
('format', [ # /s/edit/format dscherer@cmu.edu
('Format Paragraph', '<<format-paragraph>>'),
])
]
def __init__(self, editwin):
self.editwin = editwin
def close(self):
self.editwin = None
def format_paragraph_event(self, event):
maxformatwidth = int(idleConf.GetOption('main','FormatParagraph','paragraph'))
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text = self.editwin.text
first, last = self.editwin.get_selection_indices()
if first and last:
data = text.get(first, last)
comment_header = ''
else:
first, last, comment_header, data = \
find_paragraph(text, text.index("insert"))
if comment_header:
# Reformat the comment lines - convert to text sans header.
lines = data.split("\n")
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lines = map(lambda st, l=len(comment_header): st[l:], lines)
data = "\n".join(lines)
# Reformat to maxformatwidth chars or a 20 char width, whichever is greater.
format_width = max(maxformatwidth - len(comment_header), 20)
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newdata = reformat_paragraph(data, format_width)
# re-split and re-insert the comment header.
newdata = newdata.split("\n")
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# If the block ends in a \n, we dont want the comment
# prefix inserted after it. (Im not sure it makes sense to
# reformat a comment block that isnt made of complete
# lines, but whatever!) Can't think of a clean soltution,
# so we hack away
block_suffix = ""
if not newdata[-1]:
block_suffix = "\n"
newdata = newdata[:-1]
builder = lambda item, prefix=comment_header: prefix+item
newdata = '\n'.join(map(builder, newdata)) + block_suffix
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else:
# Just a normal text format
newdata = reformat_paragraph(data, maxformatwidth)
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text.tag_remove("sel", "1.0", "end")
if newdata != data:
text.mark_set("insert", first)
text.undo_block_start()
text.delete(first, last)
text.insert(first, newdata)
text.undo_block_stop()
else:
text.mark_set("insert", last)
text.see("insert")
Merged revisions 59450-59464 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r59455 | guido.van.rossum | 2007-12-10 21:42:53 +0100 (Mon, 10 Dec 2007) | 2 lines Remove a 2.2-ism. ........ r59459 | christian.heimes | 2007-12-10 23:28:56 +0100 (Mon, 10 Dec 2007) | 4 lines Backport of r59456:59458 from py3k to trunk Issue #1580: New free format floating point representation based on "Floating-Point Printer Sample Code", by Robert G. Burger. For example repr(11./5) now returns '2.2' instead of '2.2000000000000002'. Thanks to noam for the patch! I had to modify doubledigits.c slightly to support X64 and IA64 machines on Windows. I also added the new file to the three project files. ........ r59460 | guido.van.rossum | 2007-12-11 00:00:12 +0100 (Tue, 11 Dec 2007) | 4 lines Patch #1643738 by Ulisses Furquim -- make the is_tripped variable in signalmodule.c more robust. Includes Martin von Loewis's suggestion to set is_tripped after .tripped. ........ r59463 | kurt.kaiser | 2007-12-11 01:04:57 +0100 (Tue, 11 Dec 2007) | 2 lines format_paragraph_event wasn't returning 'break' ........ r59464 | christian.heimes | 2007-12-11 01:54:34 +0100 (Tue, 11 Dec 2007) | 3 lines The new float repr causes too much trouble and pain. I'm disabling the feature until we have sorted out the issues on all machines. 64bit machines seem to have issues and Guido has reported even worse. Guido: It's pretty bad actually -- repr(1e5) comes out as '1.0'... Ditto for repr(1eN) for most N... Both in 2.6 and in 3.0... ........
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return "break"
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def find_paragraph(text, mark):
lineno, col = map(int, mark.split("."))
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line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
while text.compare("%d.0" % lineno, "<", "end") and is_all_white(line):
lineno = lineno + 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
first_lineno = lineno
comment_header = get_comment_header(line)
comment_header_len = len(comment_header)
while get_comment_header(line)==comment_header and \
not is_all_white(line[comment_header_len:]):
lineno = lineno + 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
last = "%d.0" % lineno
# Search back to beginning of paragraph
lineno = first_lineno - 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
while lineno > 0 and \
get_comment_header(line)==comment_header and \
not is_all_white(line[comment_header_len:]):
lineno = lineno - 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
first = "%d.0" % (lineno+1)
return first, last, comment_header, text.get(first, last)
def reformat_paragraph(data, limit):
lines = data.split("\n")
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i = 0
n = len(lines)
while i < n and is_all_white(lines[i]):
i = i+1
if i >= n:
return data
indent1 = get_indent(lines[i])
if i+1 < n and not is_all_white(lines[i+1]):
indent2 = get_indent(lines[i+1])
else:
indent2 = indent1
new = lines[:i]
partial = indent1
while i < n and not is_all_white(lines[i]):
# XXX Should take double space after period (etc.) into account
words = re.split("(\s+)", lines[i])
for j in range(0, len(words), 2):
word = words[j]
if not word:
continue # Can happen when line ends in whitespace
if len((partial + word).expandtabs()) > limit and \
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partial != indent1:
new.append(partial.rstrip())
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partial = indent2
partial = partial + word + " "
if j+1 < len(words) and words[j+1] != " ":
partial = partial + " "
i = i+1
new.append(partial.rstrip())
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# XXX Should reformat remaining paragraphs as well
new.extend(lines[i:])
return "\n".join(new)
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def is_all_white(line):
return re.match(r"^\s*$", line) is not None
def get_indent(line):
return re.match(r"^(\s*)", line).group()
def get_comment_header(line):
m = re.match(r"^(\s*#*)", line)
if m is None: return ""
return m.group(1)