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render2.py
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#!/usr/bin/env python3
# Copyright © 2012-13 Qtrac Ltd. All rights reserved.
# This program or module is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version. It is provided for
# educational purposes and is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
import abc
import sys
import textwrap
if sys.version_info[:2] < (3, 2):
from xml.sax.saxutils import escape
else:
from html import escape
import Qtrac
@Qtrac.has_methods("header", "paragraph", "footer")
class Renderer(metaclass=abc.ABCMeta): pass
MESSAGE = """This is a very short {} paragraph that demonstrates
the simple {} class."""
def main():
paragraph1 = MESSAGE.format("plain-text", "TextRenderer")
paragraph2 = """This is another short paragraph just so that we can
see two paragraphs in action."""
title = "Plain Text"
textPage = Page(title, TextRenderer(22))
textPage.add_paragraph(paragraph1)
textPage.add_paragraph(paragraph2)
textPage.render()
print()
paragraph1 = MESSAGE.format("HTML", "HtmlRenderer")
title = "HTML"
file = sys.stdout
htmlPage = Page(title, HtmlRenderer(HtmlWriter(file)))
htmlPage.add_paragraph(paragraph1)
htmlPage.add_paragraph(paragraph2)
htmlPage.render()
try:
page = Page(title, HtmlWriter())
page.render()
print("ERROR! rendering with an invalid renderer")
except TypeError as err:
print(err)
class Page:
def __init__(self, title, renderer):
if not isinstance(renderer, Renderer):
raise TypeError("Expected object of type Renderer, got {}".
format(type(renderer).__name__))
self.title = title
self.renderer = renderer
self.paragraphs = []
def add_paragraph(self, paragraph):
self.paragraphs.append(paragraph)
def render(self):
self.renderer.header(self.title)
for paragraph in self.paragraphs:
self.renderer.paragraph(paragraph)
self.renderer.footer()
class TextRenderer:
def __init__(self, width=80, file=sys.stdout):
self.width = width
self.file = file
self.previous = False
def header(self, title):
self.file.write("{0:^{2}}\n{1:^{2}}\n".format(title,
"=" * len(title), self.width))
def paragraph(self, text):
if self.previous:
self.file.write("\n")
self.file.write(textwrap.fill(text, self.width))
self.file.write("\n")
self.previous = True
def footer(self):
pass
class HtmlWriter:
def __init__(self, file=sys.stdout):
self.file = file
def header(self):
self.file.write("<!doctype html>\n<html>\n")
def title(self, title):
self.file.write("<head><title>{}</title></head>\n".format(
escape(title)))
def start_body(self):
self.file.write("<body>\n")
def body(self, text):
self.file.write("<p>{}</p>\n".format(escape(text)))
def end_body(self):
self.file.write("</body>\n")
def footer(self):
self.file.write("</html>\n")
class HtmlRenderer:
def __init__(self, htmlWriter):
self.htmlWriter = htmlWriter
def header(self, title):
self.htmlWriter.header()
self.htmlWriter.title(title)
self.htmlWriter.start_body()
def paragraph(self, text):
self.htmlWriter.body(text)
def footer(self):
self.htmlWriter.end_body()
self.htmlWriter.footer()
if __name__ == "__main__":
main()