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POI'm using Python regexes in a criminally inefficient manner
 

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  1. POI'm using Python regexes in a criminally inefficient manner
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    <p>My goal here is to create a very simple template language. At the moment, I'm working on replacing a variable with a value, like this:</p> <p>This input:</p> <blockquote> The Web </blockquote> <p>Should produce this output:</p> <blockquote> <p>The Web This Is A Test Variable</p> </blockquote> <p>I've got it working. But looking at my code, I'm running multiple identical regexes on the same strings -- that just offends my sense of efficiency. There's got to be a better, more Pythonic way. (It's the two "while" loops that really offend.)</p> <p>This does pass the unit tests, so if this is silly premature optimization, tell me -- I'm willing to let this go. There may be dozens of these variable definitions and uses in a document, but not hundreds. But I suspect there's obvious (to other people) ways of improving this, and I'm curious what the StackOverflow crowd will come up with.</p> <pre><code>def stripMatchedQuotes(item): MatchedSingleQuotes = re.compile(r"'(.*)'", re.LOCALE) MatchedDoubleQuotes = re.compile(r'"(.*)"', re.LOCALE) item = MatchedSingleQuotes.sub(r'\1', item, 1) item = MatchedDoubleQuotes.sub(r'\1', item, 1) return item def processVariables(item): VariableDefinition = re.compile(r'&lt;%(.*?)=(.*?)%&gt;', re.LOCALE) VariableUse = re.compile(r'&lt;%(.*?)%&gt;', re.LOCALE) Variables={} while VariableDefinition.search(item): VarName, VarDef = VariableDefinition.search(item).groups() VarName = stripMatchedQuotes(VarName).upper().strip() VarDef = stripMatchedQuotes(VarDef.strip()) Variables[VarName] = VarDef item = VariableDefinition.sub('', item, 1) while VariableUse.search(item): VarName = stripMatchedQuotes(VariableUse.search(item).group(1).upper()).strip() item = VariableUse.sub(Variables[VarName], item, 1) return item </code></pre>
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    1. USAndy Lester
    1. USSchof
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    1. COThe world does not need another Python template language. There exist dozens already. Can't you just use one of those?
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      1. POI'm using Python regexes in a criminally inefficient manner
      1. USJohn Millikin
    2. CO@Schof: may I point you out to http://genshi.edgewall.org/ which will make your life cake.
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    3. COI love the Title +1 for making me laugh.
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      1. USUnkwnTech
 

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