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+""" 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
+import tkFont as tkfont
+from idlelib.configHandler import idleConf
+
+use_ttk = False # until available to import
+if use_ttk:
+    from tkinter.ttk import Menubutton
+
+## About IDLE ##
+
+
+## IDLE Help ##
+
+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
+
+    def indent(self, amt=1):
+        self.level += amt
+        self.tags = '' if self.level == 0 else 'l'+str(self.level)
+
+    def handle_starttag(self, tag, attrs):
+        "Handle starttags in help.html."
+        class_ = ''
+        for a, v in attrs:
+            if a == 'class':
+                class_ = v
+        s = ''
+        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':
+            s = '\n\n'
+        elif tag == 'span' and class_ == 'pre':
+            self.chartags = 'pre'
+        elif tag == 'span' and class_ == 'versionmodified':
+            self.chartags = 'em'
+        elif tag == 'em':
+            self.chartags = 'em'
+        elif tag in ['ul', 'ol']:
+            if class_.find('simple') != -1:
+                s = '\n'
+                self.simplelist = True
+            else:
+                self.simplelist = False
+            self.indent()
+        elif tag == 'dl':
+            if self.level > 0:
+                self.nested_dl = True
+        elif tag == 'li':
+            s = '\n* ' if self.simplelist else '\n\n* '
+        elif tag == 'dt':
+            s = '\n\n' if not self.nested_dl else '\n'  # avoid extra line
+            self.nested_dl = False
+        elif tag == 'dd':
+            self.indent()
+            s = '\n'
+        elif tag == 'pre':
+            self.pre = True
+            if self.show:
+                self.text.insert('end', '\n\n')
+            self.tags = 'preblock'
+        elif tag == 'a' and class_ == 'headerlink':
+            self.hdrlink = True
+        elif tag == 'h1':
+            self.tags = tag
+        elif tag in ['h2', 'h3']:
+            if self.show:
+                self.header = ''
+                self.text.insert('end', '\n\n')
+            self.tags = tag
+        if self.show:
+            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
+            if self.show:
+                self.toc.append((self.header, self.text.index('insert')))
+        elif tag in ['span', 'em']:
+            self.chartags = ''
+        elif tag == 'a':
+            self.hdrlink = False
+        elif tag == 'pre':
+            self.pre = False
+            self.tags = ''
+        elif tag in ['ul', 'dd', 'ol']:
+            self.indent(amt=-1)
+
+    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', ' ')
+            if self.tags == 'h1':
+                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.header += d
+            self.text.insert('end', d, (self.tags, self.chartags))
+
+    def handle_charref(self, name):
+        if self.show:
+            self.text.insert('end', unichr(int(name)))
+
+
+class HelpText(Text):
+    "Display help.html."
+    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."
+        for name in 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)):
+                return name
+
+
+class HelpFrame(Frame):
+    "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))
+        toc['menu'] = drop
+        return toc
+
+
+class HelpWindow(Toplevel):
+    "Display frame with rendered html."
+    def __init__(self, parent, filename, title):
+        Toplevel.__init__(self, parent)
+        self.wm_title(title)
+        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)
+
+
+def copy_strip():
+    """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
+    maintenance version).
+
+    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,\
+         open(dst, 'w') as out:
+        for line in 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')
+    if not isfile(filename):
+        # try copy_strip, present message
+        return
+    HelpWindow(parent, filename, 'IDLE Help (%s)' % python_version())
+
+if __name__ == '__main__':
+    from idlelib.idle_test.htest import run
+    run(show_idlehelp)