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# Extension to format a paragraph
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# Does basic, standard text formatting, and also understands Python
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# comment blocks. Thus, for editing Python source code, this
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# extension is really only suitable for reformatting these comment
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# blocks or triple-quoted strings.
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# Known problems with comment reformatting:
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# * If there is a selection marked, and the first line of the
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# selection is not complete, the block will probably not be detected
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# as comments, and will have the normal "text formatting" rules
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# * If a comment block has leading whitespace that mixes tabs and
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# spaces, they will not be considered part of the same block.
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# * Fancy comments, like this bulleted list, arent handled :-)
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from configHandler import idleConf
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class FormatParagraph:
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('format', [ # /s/edit/format dscherer@cmu.edu
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('Format Paragraph', '<<format-paragraph>>'),
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def __init__(self, editwin):
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self.editwin = editwin
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def format_paragraph_event(self, event):
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maxformatwidth = int(idleConf.GetOption('main','FormatParagraph','paragraph'))
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text = self.editwin.text
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first, last = self.editwin.get_selection_indices()
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data = text.get(first, last)
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first, last, comment_header, data = \
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find_paragraph(text, text.index("insert"))
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# Reformat the comment lines - convert to text sans header.
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lines = data.split("\n")
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lines = map(lambda st, l=len(comment_header): st[l:], lines)
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data = "\n".join(lines)
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# Reformat to maxformatwidth chars or a 20 char width, whichever is greater.
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format_width = max(maxformatwidth - len(comment_header), 20)
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newdata = reformat_paragraph(data, format_width)
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# re-split and re-insert the comment header.
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newdata = newdata.split("\n")
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# If the block ends in a \n, we dont want the comment
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# prefix inserted after it. (Im not sure it makes sense to
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# reformat a comment block that isnt made of complete
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# lines, but whatever!) Can't think of a clean soltution,
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newdata = newdata[:-1]
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builder = lambda item, prefix=comment_header: prefix+item
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newdata = '\n'.join(map(builder, newdata)) + block_suffix
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# Just a normal text format
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newdata = reformat_paragraph(data, maxformatwidth)
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text.tag_remove("sel", "1.0", "end")
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text.mark_set("insert", first)
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text.undo_block_start()
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text.delete(first, last)
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text.insert(first, newdata)
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text.undo_block_stop()
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text.mark_set("insert", last)
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def find_paragraph(text, mark):
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lineno, col = map(int, mark.split("."))
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line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
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while text.compare("%d.0" % lineno, "<", "end") and is_all_white(line):
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line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
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comment_header = get_comment_header(line)
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comment_header_len = len(comment_header)
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while get_comment_header(line)==comment_header and \
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not is_all_white(line[comment_header_len:]):
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line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
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last = "%d.0" % lineno
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# Search back to beginning of paragraph
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lineno = first_lineno - 1
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line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
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while lineno > 0 and \
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get_comment_header(line)==comment_header and \
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not is_all_white(line[comment_header_len:]):
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line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
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first = "%d.0" % (lineno+1)
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return first, last, comment_header, text.get(first, last)
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def reformat_paragraph(data, limit):
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lines = data.split("\n")
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while i < n and is_all_white(lines[i]):
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indent1 = get_indent(lines[i])
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if i+1 < n and not is_all_white(lines[i+1]):
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indent2 = get_indent(lines[i+1])
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while i < n and not is_all_white(lines[i]):
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# XXX Should take double space after period (etc.) into account
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words = re.split("(\s+)", lines[i])
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for j in range(0, len(words), 2):
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continue # Can happen when line ends in whitespace
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if len((partial + word).expandtabs()) > limit and \
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new.append(partial.rstrip())
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partial = partial + word + " "
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if j+1 < len(words) and words[j+1] != " ":
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partial = partial + " "
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new.append(partial.rstrip())
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# XXX Should reformat remaining paragraphs as well
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new.extend(lines[i:])
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return "\n".join(new)
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def is_all_white(line):
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return re.match(r"^\s*$", line) is not None
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def get_indent(line):
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return re.match(r"^(\s*)", line).group()
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def get_comment_header(line):
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m = re.match(r"^(\s*#*)", line)
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if m is None: return ""