""" help.py: Implement the Idle help menu.
Contents are subject to revision at any time, without notice.
Help => About IDLE: diplay About Idle dialog
<to be moved here from aboutDialog.py>
Help => IDLE Help: Display help.html with proper formatting.
Doc/library/idle.rst (Sphinx)=> Doc/build/html/library/idle.html
(help.copy_strip)=> Lib/idlelib/help.html
HelpParser - Parse help.html and render to tk Text.
HelpText - Display formatted help.html.
HelpFrame - Contain text, scrollbar, and table-of-contents.
(This will be needed for display in a future tabbed window.)
HelpWindow - Display HelpFrame in a standalone window.
copy_strip - Copy idle.html to help.html, rstripping each line.
show_idlehelp - Create HelpWindow. Called in EditorWindow.help_dialog.
from HTMLParser import HTMLParser
from os.path import abspath, dirname, isdir, isfile, join
from platform import python_version
from Tkinter import Tk, Toplevel, Frame, Text, Scrollbar, Menu, Menubutton
from idlelib.configHandler import idleConf
use_ttk = False # until available to import
from tkinter.ttk import Menubutton
class HelpParser(HTMLParser):
"""Render help.html into a text widget.
The overridden handle_xyz methods handle a subset of html tags.
The supplied text should have the needed tag configurations.
The behavior for unsupported tags, such as table, is undefined.
If the tags generated by Sphinx change, this class, especially
the handle_starttag and handle_endtags methods, might have to also.
def __init__(self, text):
HTMLParser.__init__(self)
self.text = text # text widget we're rendering into
self.tags = '' # current block level text tags to apply
self.chartags = '' # current character level text tags
self.show = False # used so we exclude page navigation
self.hdrlink = False # used so we don't show header links
self.level = 0 # indentation level
self.pre = False # displaying preformatted text
self.hprefix = '' # prefix such as '25.5' to strip from headings
self.nested_dl = False # if we're in a nested <dl>
self.simplelist = False # simple list (no double spacing)
self.toc = [] # pair headers with text indexes for toc
self.header = '' # text within header tags for toc
self.tags = '' if self.level == 0 else 'l'+str(self.level)
def handle_starttag(self, tag, attrs):
"Handle starttags in help.html."
if tag == 'div' and class_ == 'section':
self.show = True # start of main content
elif tag == 'div' and class_ == 'sphinxsidebar':
self.show = False # end of main content
elif tag == 'p' and class_ != 'first':
elif tag == 'span' and class_ == 'pre':
elif tag == 'span' and class_ == 'versionmodified':
elif tag in ['ul', 'ol']:
if class_.find('simple') != -1:
s = '\n* ' if self.simplelist else '\n\n* '
s = '\n\n' if not self.nested_dl else '\n' # avoid extra line
self.text.insert('end', '\n\n')
elif tag == 'a' and class_ == 'headerlink':
elif tag in ['h2', 'h3']:
self.text.insert('end', '\n\n')
self.text.insert('end', s, (self.tags, self.chartags))
def handle_endtag(self, tag):
"Handle endtags in help.html."
if tag in ['h1', 'h2', 'h3']:
self.indent(0) # clear tag, reset indent
self.toc.append((self.header, self.text.index('insert')))
elif tag in ['span', 'em']:
elif tag in ['ul', 'dd', 'ol']:
def handle_data(self, data):
"Handle date segments in help.html."
if self.show and not self.hdrlink:
d = data if self.pre else data.replace('\n', ' ')
self.hprefix = d[0:d.index(' ')]
if self.tags in ['h1', 'h2', 'h3'] and self.hprefix != '':
if d[0:len(self.hprefix)] == self.hprefix:
d = d[len(self.hprefix):].strip()
self.text.insert('end', d, (self.tags, self.chartags))
def handle_charref(self, name):
self.text.insert('end', unichr(int(name)))
def __init__(self, parent, filename):
"Configure tags and feed file to parser."
uwide = idleConf.GetOption('main', 'EditorWindow', 'width', type='int')
uhigh = idleConf.GetOption('main', 'EditorWindow', 'height', type='int')
uhigh = 3 * uhigh // 4 # lines average 4/3 of editor line height
Text.__init__(self, parent, wrap='word', highlightthickness=0,
padx=5, borderwidth=0, width=uwide, height=uhigh)
normalfont = self.findfont(['TkDefaultFont', 'arial', 'helvetica'])
fixedfont = self.findfont(['TkFixedFont', 'monaco', 'courier'])
self['font'] = (normalfont, 12)
self.tag_configure('em', font=(normalfont, 12, 'italic'))
self.tag_configure('h1', font=(normalfont, 20, 'bold'))
self.tag_configure('h2', font=(normalfont, 18, 'bold'))
self.tag_configure('h3', font=(normalfont, 15, 'bold'))
self.tag_configure('pre', font=(fixedfont, 12), background='#f6f6ff')
self.tag_configure('preblock', font=(fixedfont, 10), lmargin1=25,
borderwidth=1, relief='solid', background='#eeffcc')
self.tag_configure('l1', lmargin1=25, lmargin2=25)
self.tag_configure('l2', lmargin1=50, lmargin2=50)
self.tag_configure('l3', lmargin1=75, lmargin2=75)
self.tag_configure('l4', lmargin1=100, lmargin2=100)
self.parser = HelpParser(self)
with open(filename) as f:
contents = f.read().decode(encoding='utf-8')
self.parser.feed(contents)
self['state'] = 'disabled'
def findfont(self, names):
"Return name of first font family derived from names."
if name.lower() in (x.lower() for x in tkfont.names(root=self)):
font = tkfont.Font(name=name, exists=True, root=self)
return font.actual()['family']
elif name.lower() in (x.lower()
for x in tkfont.families(root=self)):
"Display html text, scrollbar, and toc."
def __init__(self, parent, filename):
Frame.__init__(self, parent)
text = HelpText(self, filename)
self['background'] = text['background']
scroll = Scrollbar(self, command=text.yview)
text['yscrollcommand'] = scroll.set
self.rowconfigure(0, weight=1)
self.columnconfigure(1, weight=1) # text
self.toc_menu(text).grid(column=0, row=0, sticky='nw')
text.grid(column=1, row=0, sticky='nsew')
scroll.grid(column=2, row=0, sticky='ns')
def toc_menu(self, text):
"Create table of contents as drop-down menu."
toc = Menubutton(self, text='TOC')
drop = Menu(toc, tearoff=False)
for lbl, dex in text.parser.toc:
drop.add_command(label=lbl, command=lambda dex=dex:text.yview(dex))
class HelpWindow(Toplevel):
"Display frame with rendered html."
def __init__(self, parent, filename, title):
Toplevel.__init__(self, parent)
self.protocol("WM_DELETE_WINDOW", self.destroy)
HelpFrame(self, filename).grid(column=0, row=0, sticky='nsew')
self.grid_columnconfigure(0, weight=1)
self.grid_rowconfigure(0, weight=1)
"""Copy idle.html to idlelib/help.html, stripping trailing whitespace.
Files with trailing whitespace cannot be pushed to the hg cpython
repository. For 3.x (on Windows), help.html is generated, after
editing idle.rst in the earliest maintenance version, with
sphinx-build -bhtml . build/html
python_d.exe -c "from idlelib.help import copy_strip; copy_strip()"
After refreshing TortoiseHG workshop to generate a diff,
check both the diff and displayed text. Push the diff along with
the idle.rst change and merge both into default (or an intermediate
When the 'earlist' version gets its final maintenance release,
do an update as described above, without editing idle.rst, to
rebase help.html on the next version of idle.rst. Do not worry
about version changes as version is not displayed. Examine other
changes and the result of Help -> IDLE Help.
If maintenance and default versions of idle.rst diverge, and
merging does not go smoothly, then consider generating
separate help.html files from separate idle.htmls.
src = join(abspath(dirname(dirname(dirname(__file__)))),
'Doc', 'build', 'html', 'library', 'idle.html')
dst = join(abspath(dirname(__file__)), 'help.html')
with open(src, 'r') as inn,\
out.write(line.rstrip() + '\n')
print('idle.html copied to help.html')
def show_idlehelp(parent):
"Create HelpWindow; called from Idle Help event handler."
filename = join(abspath(dirname(__file__)), 'help.html')
# try copy_strip, present message
HelpWindow(parent, filename, 'IDLE Help (%s)' % python_version())
if __name__ == '__main__':
from idlelib.idle_test.htest import run
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
