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Introduction to Surlex Cody Soyland Djangocon 2009 Purpose - PowerPoint PPT Presentation

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Introduction to Surlex Cody Soyland Djangocon 2009 Purpose Alternative to regex matching/capturing Actually, a regex generator Concise syntax Designed for data extraction Why reinvent the wheel? Regex vs. Surlex Basic matching:

  1. Introduction to Surlex Cody Soyland Djangocon 2009

  2. Purpose ● Alternative to regex matching/capturing ● Actually, a regex generator ● Concise syntax ● Designed for data extraction

  3. Why reinvent the wheel?

  4. Regex vs. Surlex Basic matching: Surlex: <var> Regex: (?P<var>.+) Makes easy-to-read URL patterns: Surlex: /blog/<year>/<month>/<slug>/ Regex: /blog/(?P<year>.+)/(?P<month>.+)/(?P<slug>.+)/

  5. Embedded Regex Allows Specificity ● Specific is better than general ● T arget: the string “2009” ● Bad: .+ ● Better: \d+ ● Perfect: \d{4} ● Surlex Equivalents: ● <year> ● <year=\d+> ● <year=\d{4}>

  6. Wait, I'm back to writing regular expressions?!

  7. Macros ease common tasks surlex: <slug:s> == surlex: <slug=[\w-]+> == regex: (?P<slug>[\w-]+)

  8. Macros shorten things a lot Built-in date and slug macros enable conciseness: /blog/<year:Y>/<month:M>/<day:d>/<slug:s>/ == /blog/(?P<year>\d{4})/(?P<month>(jan|feb|mar| apr|may|jun|jul|aug|sep|oct|nov|dec))/(? P<day>\d{1,2})/ (?P<slug>[\w-]+)/

  9. Matching without capturing Simply omit the variable name Macro matching a slug: <:s> (regex: [\w-]+) Regex matching a digit: <=\d> (regex: \d)

  10. Other features Optional strings in parentheses: Surlex: “/blog/(<year:Y>/)” Regex: “/blog/((?P<year>\d{4})/)?” Wildcards: Surlex: “/*.*” Regex: “/.*\..*” Start and end of string: “^” and “$” work just like regex

  11. Django Integration from surlex.dj import surl urlpatterns = patterns('', surl(r'^blog/<year:Y>/<month:M>/<day:d>/<slug:s>/$', blog.views.post_detail, name='blog_post_detail'), )

  12. Try it yourself! pip install surlex or git clone git://github.com/codysoyland/surlex.git Thanks! Cody Soyland codysoyland@gmail.com http://www.codysoyland.com/ http://www.github.com/codysoyland/

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