251 lines
9.4 KiB
Python
251 lines
9.4 KiB
Python
""" help.py: Implement the Idle help menu.
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Contents are subject to revision at any time, without notice.
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Help => About IDLE: diplay About Idle dialog
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<to be moved here from aboutDialog.py>
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Help => IDLE Help: Display help.html with proper formatting.
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Doc/library/idle.rst (Sphinx)=> Doc/build/html/library/idle.html
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(help.copy_strip)=> Lib/idlelib/help.html
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HelpParser - Parse help.html and and render to tk Text.
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HelpText - Display formatted help.html.
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HelpFrame - Contain text, scrollbar, and table-of-contents.
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(This will be needed for display in a future tabbed window.)
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HelpWindow - Display HelpFrame in a standalone window.
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copy_strip - Copy idle.html to help.html, rstripping each line.
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show_idlehelp - Create HelpWindow. Called in EditorWindow.help_dialog.
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"""
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from html.parser import HTMLParser
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from os.path import abspath, dirname, isdir, isfile, join
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from tkinter import Tk, Toplevel, Frame, Text, Scrollbar, Menu, Menubutton
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from tkinter import font as tkfont
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use_ttk = False # until available to import
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if use_ttk:
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from tkinter.ttk import Menubutton
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## About IDLE ##
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## IDLE Help ##
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class HelpParser(HTMLParser):
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"""Render help.html into a text widget.
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The overridden handle_xyz methods handle a subset of html tags.
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The supplied text should have the needed tag configurations.
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The behavior for unsupported tags, such as table, is undefined.
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"""
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def __init__(self, text):
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HTMLParser.__init__(self, convert_charrefs=True)
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self.text = text # text widget we're rendering into
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self.tags = '' # current text tags to apply
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self.show = False # used so we exclude page navigation
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self.hdrlink = False # used so we don't show header links
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self.level = 0 # indentation level
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self.pre = False # displaying preformatted text
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self.hprefix = '' # strip e.g. '25.5' from headings
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self.nested_dl = False # if we're in a nested <dl>
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self.simplelist = False # simple list (no double spacing)
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self.tocid = 1 # id for table of contents entries
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self.contents = [] # map toc ids to section titles
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self.data = '' # to record data within header tags for toc
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def indent(self, amt=1):
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self.level += amt
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self.tags = '' if self.level == 0 else 'l'+str(self.level)
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def handle_starttag(self, tag, attrs):
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"Handle starttags in help.html."
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class_ = ''
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for a, v in attrs:
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if a == 'class':
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class_ = v
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s = ''
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if tag == 'div' and class_ == 'section':
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self.show = True # start of main content
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elif tag == 'div' and class_ == 'sphinxsidebar':
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self.show = False # end of main content
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elif tag == 'p' and class_ != 'first':
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s = '\n\n'
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elif tag == 'span' and class_ == 'pre':
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self.tags = 'pre'
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elif tag == 'span' and class_ == 'versionmodified':
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self.tags = 'em'
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elif tag == 'em':
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self.tags = 'em'
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elif tag in ['ul', 'ol']:
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if class_.find('simple') != -1:
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s = '\n'
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self.simplelist = True
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else:
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self.simplelist = False
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self.indent()
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elif tag == 'dl':
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if self.level > 0:
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self.nested_dl = True
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elif tag == 'li':
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s = '\n* ' if self.simplelist else '\n\n* '
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elif tag == 'dt':
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s = '\n\n' if not self.nested_dl else '\n' # avoid extra line
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self.nested_dl = False
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elif tag == 'dd':
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self.indent()
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s = '\n'
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elif tag == 'pre':
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self.pre = True
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if self.show:
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self.text.insert('end', '\n\n')
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self.tags = 'preblock'
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elif tag == 'a' and class_ == 'headerlink':
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self.hdrlink = True
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elif tag == 'h1':
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self.text.mark_set('toc'+str(self.tocid),
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self.text.index('end-1line'))
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self.tags = tag
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elif tag in ['h2', 'h3']:
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if self.show:
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self.data = ''
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self.text.mark_set('toc'+str(self.tocid),
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self.text.index('end-1line'))
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self.text.insert('end', '\n\n')
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self.tags = tag
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if self.show:
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self.text.insert('end', s, self.tags)
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def handle_endtag(self, tag):
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"Handle endtags in help.html."
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if tag in ['h1', 'h2', 'h3', 'span', 'em']:
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self.indent(0) # clear tag, reset indent
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if self.show and tag in ['h1', 'h2', 'h3']:
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title = self.data
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self.contents.append(('toc'+str(self.tocid), title))
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self.tocid += 1
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elif tag == 'a':
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self.hdrlink = False
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elif tag == 'pre':
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self.pre = False
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self.tags = ''
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elif tag in ['ul', 'dd', 'ol']:
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self.indent(amt=-1)
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def handle_data(self, data):
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"Handle date segments in help.html."
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if self.show and not self.hdrlink:
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d = data if self.pre else data.replace('\n', ' ')
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if self.tags == 'h1':
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self.hprefix = d[0:d.index(' ')]
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if self.tags in ['h1', 'h2', 'h3'] and self.hprefix != '':
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if d[0:len(self.hprefix)] == self.hprefix:
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d = d[len(self.hprefix):].strip()
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self.data += d
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self.text.insert('end', d, self.tags)
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class HelpText(Text):
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"Display help.html."
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def __init__(self, parent, filename):
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"Configure tags and feed file to parser."
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Text.__init__(self, parent, wrap='word', highlightthickness=0,
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padx=5, borderwidth=0)
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normalfont = self.findfont(['TkDefaultFont', 'arial', 'helvetica'])
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fixedfont = self.findfont(['TkFixedFont', 'monaco', 'courier'])
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self['font'] = (normalfont, 12)
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self.tag_configure('em', font=(normalfont, 12, 'italic'))
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self.tag_configure('h1', font=(normalfont, 20, 'bold'))
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self.tag_configure('h2', font=(normalfont, 18, 'bold'))
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self.tag_configure('h3', font=(normalfont, 15, 'bold'))
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self.tag_configure('pre', font=(fixedfont, 12))
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self.tag_configure('preblock', font=(fixedfont, 10), lmargin1=25,
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borderwidth=1, relief='solid', background='#eeffcc')
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self.tag_configure('l1', lmargin1=25, lmargin2=25)
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self.tag_configure('l2', lmargin1=50, lmargin2=50)
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self.tag_configure('l3', lmargin1=75, lmargin2=75)
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self.tag_configure('l4', lmargin1=100, lmargin2=100)
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self.parser = HelpParser(self)
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with open(filename, encoding='utf-8') as f:
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contents = f.read()
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self.parser.feed(contents)
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self['state'] = 'disabled'
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def findfont(self, names):
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"Return name of first font family derived from names."
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for name in names:
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if name.lower() in (x.lower() for x in tkfont.names(root=self)):
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font = tkfont.Font(name=name, exists=True, root=self)
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return font.actual()['family']
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elif name.lower() in (x.lower()
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for x in tkfont.families(root=self)):
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return name
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class HelpFrame(Frame):
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"Display html text, scrollbar, and toc."
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def __init__(self, parent, filename):
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Frame.__init__(self, parent)
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text = HelpText(self, filename)
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self['background'] = text['background']
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scroll = Scrollbar(self, command=text.yview)
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text['yscrollcommand'] = scroll.set
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text.grid(column=1, row=0, sticky='nsew')
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scroll.grid(column=2, row=0, sticky='ns')
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self.grid_columnconfigure(1, weight=1)
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self.grid_rowconfigure(0, weight=1)
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toc = self.contents_widget(text)
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toc.grid(column=0, row=0, sticky='nw')
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def contents_widget(self, text):
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"Create table of contents."
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toc = Menubutton(self, text='TOC')
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drop = Menu(toc, tearoff=False)
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for tag, lbl in text.parser.contents:
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drop.add_command(label=lbl, command=lambda mark=tag:text.see(mark))
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toc['menu'] = drop
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return toc
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class HelpWindow(Toplevel):
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"Display frame with rendered html."
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def __init__(self, parent, filename, title):
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Toplevel.__init__(self, parent)
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self.wm_title(title)
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self.protocol("WM_DELETE_WINDOW", self.destroy)
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HelpFrame(self, filename).grid(column=0, row=0, sticky='nsew')
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self.grid_columnconfigure(0, weight=1)
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self.grid_rowconfigure(0, weight=1)
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def copy_strip():
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"Copy idle.html to idlelib/help.html, stripping trailing whitespace."
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src = join(abspath(dirname(dirname(dirname(__file__)))),
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'Doc', 'build', 'html', 'library', 'idle.html')
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dst = join(abspath(dirname(__file__)), 'help.html')
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with open(src, 'rb') as inn,\
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open(dst, 'wb') as out:
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for line in inn:
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out.write(line.rstrip() + '\n')
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print('idle.html copied to help.html')
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def show_idlehelp(parent):
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"Create HelpWindow; called from Idle Help event handler."
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filename = join(abspath(dirname(__file__)), 'help.html')
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if not isfile(filename):
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# try copy_strip, present message
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return
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HelpWindow(parent, filename, 'IDLE Help')
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if __name__ == '__main__':
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from idlelib.idle_test.htest import run
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run(show_idlehelp)
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