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import data
import css
from ll.xist import xsc, parse
from ll.xist.ns import html
from flask import Flask, url_for
import re
import difflib
class DiffSupport:
def _diff(self, line1, line2):
diff = list(difflib._mdiff([line1], [line2]))
return (self._format_diff(diff[0][0][1]),
self._format_diff(diff[0][1][1]))
def _diff_lines(self, lines1, lines2):
diff = difflib._mdiff(lines1, lines2)
rows = []
for ((line1, diff1), (line2, diff2), flag) in diff:
rows.append(html.tr(
html.th(),
html.td(line1),
html.td(*self._format_diff(diff1)),
html.td(line2),
html.td(*self._format_diff(diff2))
))
return html.table(rows, **{'class': 'textdiff'})
def _format_diff(self, line):
elems = []
nextpos = line.find("\x00")
while nextpos != -1 and nextpos + 1 < len(line):
actionclass = {
'+': 'diff_add', '-': 'diff_sub',
'^': 'diff_chg'}[line[nextpos + 1]]
endpos = line.find("\x01", nextpos + 2)
if nextpos != 0: # intermediate unchanged text
elems += [html.span(line[:nextpos])]
text = line[nextpos + 2:endpos]
elems += [html.span(text, **{'class': actionclass})]
line = line[endpos:]
nextpos = line.find("\x00")
if line != "": # trailing unchanged text
elems += [html.span(line)]
return elems
class Difftable(html.div, DiffSupport):
def __init__(self, to_version, from_version=None):
super().__init__()
if from_version == None:
self.single_version(to_version)
else:
self.two_versions(to_version, from_version)
def single_version(self, version):
self.append(html.table(
html.tr(html.th("Title"), html.td(version.title)),
html.tr(html.th("Date"), html.td(
version.created_date.strftime("%x %X"))),
html.tr(html.th("Link"), html.td(
html.a(version.url, href=version.url))),
html.tr(html.th("Text", colspan=2)),
html.tr(html.td(map(html.p, version.text.split("\n")), colspan=2))
))
def two_versions(self, to_version, from_version):
def prepare_text(text):
return re.sub("\n\n\n*", "\n\n", text).split("\n")
from_text = prepare_text(from_version.text)
to_text = prepare_text(to_version.text)
from_difftitle, to_difftitle = self._diff(
from_version.title, to_version.title)
diff = difflib._mdiff(from_text, to_text)
self.append(html.table(
html.tr(html.th("Title"),
html.td(from_difftitle),
html.td(to_difftitle), **{'class': 'textdiff'}),
html.tr(html.th("Date"),
html.td(from_version.created_date.strftime("%x %X")),
html.td(to_version.created_date.strftime("%x %X"))),
html.tr(html.th("Link"),
html.td(html.a(from_version.url, href=from_version.url)),
html.td(html.a(to_version.url, href=to_version.url))),
html.tr(html.th("Text", colspan=3)),
html.tr(html.td(self._diff_lines(from_text, to_text), colspan=3)),
**{'class': "versiondiff"}
))
class ItemWidget(html.div, DiffSupport):
def __init__(self, item):
super().__init__()
self.append(html.h2(html.a(item.title,
href=url_for('item', id=item.id))))
versionsFrom = [None] + list(item.versions)[:-1]
versionsTo = item.versions
versions = list(zip(versionsFrom, versionsTo))
self.append(html.ul(
*map(self.version, versions)))
def version(self, versions):
from_version, to_version = versions
if from_version == None:
title = html.span(to_version.title)
else:
from_difftitle, to_difftitle = self._diff(
from_version.title, to_version.title)
title = html.span(to_difftitle, **{'class': 'textdiff'})
return html.li(html.span(to_version.created_date.strftime("%x %X")),
html.span(" - "),
title)
class Template:
@staticmethod
def template(title, body):
return xsc.Frag(
html.DocTypeXHTML10transitional(), "\n",
html.html(
html.head(
html.meta(charset='utf-8'),
html.title(title),
html.style(css.string(
css.Rule(".textdiff", ".diff_add",
backgroundColor="#CEF6CE"),
css.Rule(".textdiff", ".diff_next",
backgroundColor="#c0c0c0"),
css.Rule(".textdiff", ".diff_sub",
backgroundColor="#FFDADA"),
css.Rule(".textdiff", ".diff_chg",
backgroundColor="#E5E1FF")
))
), "\n",
html.body(body)))
@staticmethod
def index(feeds):
return Template.template(
"Index",
html.ul(
*map(lambda feed: html.li(
html.a(feed.title or feed.url, href=url_for('feed', id=feed.id))),
feeds)))
@staticmethod
def feed(feed, items):
return Template.template(
"Feed {}".format(feed.title or feed.url),
html.div(
html.a("Back", href=url_for('index')),
html.h1(feed.title),
*map(ItemWidget, items)))
@staticmethod
def item(item, versions):
versionsA = versions
versionsB = [None] + versions[:-1]
versions = list(zip(versionsA, versionsB))
return Template.template("Item: {}".format(item.title),
html.div(
html.a("Back to {}".format(item.feed.title),
href=url_for('feed', id=item.feed.id)),
html.h1(item.title),
*map(lambda versionAB: html.div(
Difftable(versionAB[0], versionAB[1]),
html.hr()),
versions)))
def run():
app = Flask(__name__)
@app.route('/')
def index():
return Template.index(data.Feed.select()).string("utf-8")
@app.route('/feed/<id>')
def feed(id):
feed = data.Feed.get(data.Feed.id == id)
items = data.Item.select() \
.where(data.Item.feed == feed) \
.order_by(data.Item.created_date.desc())
return Template.feed(feed, items).string("utf-8")
@app.route('/item/<id>')
def item(id):
item = data.Item.get(data.Item.id == id)
versions = data.Version.select() \
.where(data.Version.item == item) \
.order_by(data.Version.created_date)
return Template.item(item, list(versions)).string("utf-8")
app.run()
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