#!/usr/bin/python # markup.py import sys, re from handlers import * from util import * from rules import * class Parser: """ A Parser reads a text file, applying rules and controlling a handler. """ def __init__(self, handler): self.handler = handler self.rules = [] self.filters = [] def addRule(self, rule): self.rules.append(rule) def addFilter(self, pattern, name): def filter(block, handler): return re.sub(pattern, handler.sub(name), block) self.filters.append(filter) def parse(self, file): self.handler.start('document') for block in blocks(file): for filter in self.filters: block = filter(block, self.handler) for rule in self.rules: if rule.condition(block): last = rule.action(block, self.handler) if last: break self.handler.end('document') class BasicTextParser(Parser): """ A specific Parser that adds rules and filters in its constructor. """ def __init__(self, handler): Parser.__init__(self, handler) self.addRule(ListRule()) self.addRule(ListItemRule()) self.addRule(TitleRule()) self.addRule(HeadingRule()) self.addRule(ParagraphRule()) self.addFilter(r'\*(.+?)\*', 'emphasis') self.addFilter(r'(http://[\.a-zA-Z/]+)', 'url') self.addFilter(r'([\.a-zA-Z]+@[\.a-zA-Z]+[a-zA-Z]+)', 'mail') handler = HTMLRenderer() parser = BasicTextParser(handler) parser.parse(sys.stdin)