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300 lines
12 KiB
Python
300 lines
12 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: display About Idle dialog
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<to be moved here from help_about.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 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, isfile, join
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from platform import python_version
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from tkinter import Toplevel, Text, Menu
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from tkinter.ttk import Frame, Menubutton, Scrollbar, Style
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from tkinter import font as tkfont
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from idlelib.config import idleConf
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from idlelib.colorizer import color_config
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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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If the tags generated by Sphinx change, this class, especially
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the handle_starttag and handle_endtags methods, might have to also.
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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 block level text tags to apply.
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self.chartags = '' # Current character level text tags.
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self.show = False # Exclude html page navigation.
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self.hdrlink = False # Exclude html header links.
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self.level = 0 # Track indentation level.
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self.pre = False # Displaying preformatted text?
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self.hprefix = '' # Heading prefix (like '25.5'?) to remove.
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self.nested_dl = False # In a nested <dl>?
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self.simplelist = False # In a simple list (no double spacing)?
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self.toc = [] # Pair headers with text indexes for toc.
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self.header = '' # Text within header tags for toc.
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self.prevtag = None # Previous tag info (opener?, tag).
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def indent(self, amt=1):
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"Change indent (+1, 0, -1) and tags."
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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 == 'section' and attrs == [('id', 'idle')]:
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self.show = True # Start main content.
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elif tag == 'div' and class_ == 'clearer':
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self.show = False # End main content.
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elif tag == 'p' and self.prevtag and not self.prevtag[0]:
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# Begin a new block for <p> tags after a closed tag.
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# Avoid extra lines, e.g. after <pre> tags.
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lastline = self.text.get('end-1c linestart', 'end-1c')
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s = '\n\n' if lastline and not lastline.isspace() else '\n'
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elif tag == 'span' and class_ == 'pre':
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self.chartags = 'pre'
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elif tag == 'span' and class_ == 'versionmodified':
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self.chartags = 'em'
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elif tag == 'em':
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self.chartags = '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* '
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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.tags = tag
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elif tag in ['h2', 'h3']:
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if self.show:
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self.header = ''
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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, self.chartags))
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self.prevtag = (True, tag)
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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']:
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assert self.level == 0
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if self.show:
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indent = (' ' if tag == 'h3' else
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' ' if tag == 'h2' else
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'')
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self.toc.append((indent+self.header, self.text.index('insert')))
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self.tags = ''
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elif tag in ['span', 'em']:
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self.chartags = ''
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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(-1)
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self.prevtag = (False, tag)
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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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try:
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self.hprefix = d[0:d.index(' ')]
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except ValueError:
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self.hprefix = ''
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if self.tags in ['h1', 'h2', 'h3']:
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if (self.hprefix != '' and
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d[0:len(self.hprefix)] == self.hprefix):
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d = d[len(self.hprefix):]
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self.header += d.strip()
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self.text.insert('end', d, (self.tags, self.chartags))
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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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uwide = idleConf.GetOption('main', 'EditorWindow', 'width', type='int')
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uhigh = idleConf.GetOption('main', 'EditorWindow', 'height', type='int')
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uhigh = 3 * uhigh // 4 # Lines average 4/3 of editor line height.
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Text.__init__(self, parent, wrap='word', highlightthickness=0,
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padx=5, borderwidth=0, width=uwide, height=uhigh)
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normalfont = self.findfont(['TkDefaultFont', 'arial', 'helvetica'])
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fixedfont = self.findfont(['TkFixedFont', 'monaco', 'courier'])
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color_config(self)
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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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preback = self['selectbackground']
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self.tag_configure('preblock', font=(fixedfont, 10), lmargin1=25,
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background=preback)
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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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self.text = text = HelpText(self, filename)
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self.style = Style(parent)
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self['style'] = 'helpframe.TFrame'
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self.style.configure('helpframe.TFrame', background=text['background'])
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self.toc = toc = self.toc_menu(text)
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self.scroll = scroll = Scrollbar(self, command=text.yview)
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text['yscrollcommand'] = scroll.set
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self.rowconfigure(0, weight=1)
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self.columnconfigure(1, weight=1) # Only expand the text widget.
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toc.grid(row=0, column=0, sticky='nw')
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text.grid(row=0, column=1, sticky='nsew')
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scroll.grid(row=0, column=2, sticky='ns')
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def toc_menu(self, text):
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"Create table of contents as drop-down menu."
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toc = Menubutton(self, text='TOC')
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drop = Menu(toc, tearoff=False)
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for lbl, dex in text.parser.toc:
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drop.add_command(label=lbl, command=lambda dex=dex:text.yview(dex))
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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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self.frame = HelpFrame(self, filename)
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self.frame.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(): # pragma: no cover
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"""Copy idle.html to idlelib/help.html, stripping trailing whitespace.
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Files with trailing whitespace cannot be pushed to the git cpython
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repository. For 3.x (on Windows), help.html is generated, after
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editing idle.rst on the master branch, with
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sphinx-build -bhtml . build/html
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python_d.exe -c "from idlelib.help import copy_strip; copy_strip()"
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Check build/html/library/idle.html, the help.html diff, and the text
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displayed by Help => IDLE Help. Add a blurb and create a PR.
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It can be worthwhile to occasionally generate help.html without
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touching idle.rst. Changes to the master version and to the doc
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build system may result in changes that should not changed
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the displayed text, but might break HelpParser.
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As long as master and maintenance versions of idle.rst remain the
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same, help.html can be backported. The internal Python version
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number is not displayed. If maintenance idle.rst diverges from
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the master version, then instead of backporting help.html from
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master, repeat the procedure above to generate a maintenance
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version.
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"""
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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() + b'\n')
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print(f'{src} copied to {dst}')
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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): # pragma: no cover
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# Try copy_strip, present message.
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return
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return HelpWindow(parent, filename, 'IDLE Doc (%s)' % python_version())
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if __name__ == '__main__':
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from unittest import main
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main('idlelib.idle_test.test_help', verbosity=2, exit=False)
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from idlelib.idle_test.htest import run
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run(show_idlehelp)
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