help.py
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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)
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