Beginning Python - From Novice to Professional

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CHAPTER 20 ■ PROJECT 1: INSTANT MARKUP 407 Listing 20-6. The Main Program (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())
408 CHAPTER 20 ■ PROJECT 1: INSTANT MARKUP 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) You can see the result of running the program on the sample text in Figure 20-2. Figure 20-2. The second attempt at generating a Web page The second implementation is clearly more complicated and extensive than the first version. The added complexity is well worth the effort because the resulting program is much more flexible and extensible. Adapting it to new input and output formats is merely a matter of subclassing and initializing the existing classes, rather than rewriting everything from scratch, as you would have had to do in the first prototype. Further Exploration Several expansions are possible for this program. Here are some possibilities: • Add support for tables. Find all aligning left word borders and split the block into columns. • Add support for interpreting all uppercase words as emphasis. (To do this properly, you will need to take into account acronyms, punctuations, names, and other capitalized words.)
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Beginning Python From Novice to Pro
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For Ranveig
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■CHAPTER 23 Project 4: In the New
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viii ■CONTENTS Strings . . . . .
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x ■CONTENTS ■CHAPTER 5 Conditio
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xxii ■CONTENTS Preparations . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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110 CHAPTER 6 ■ ABSTRACTION But w
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140 CHAPTER 7 ■ MORE ABSTRACTION
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256 CHAPTER 11 ■ FILES AND STUFF
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270 CHAPTER 12 ■ GRAPHICAL USER I
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298 CHAPTER 14 ■ NETWORK PROGRAMM
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314 CHAPTER 15 ■ PYTHON AND THE W
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558 APPENDIX B ■ PYTHON REFERENCE
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572 APPENDIX C ■ ONLINE RESOURCES
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Index ■Symbols - operator 558 !=
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■INDEX 581 get method 74-75 has_k
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■INDEX 585 finding conflicts 197
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■INDEX 593 playful programming 38
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■INDEX 595 Python C API 365 hand-
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■INDEX 601 TestCase class methods
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