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

Oct 31, 2022 •221 likes •357 views

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:

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: Surlex: <var> Regex: (?P<var>.+) Makes easy-to-read URL patterns: Surlex: /blog/<year>/<month>/<slug>/ Regex: /blog/(?P<year>.+)/(?P<month>.+)/(?P<slug>.+)/
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}>
Wait, I'm back to writing regular expressions?!
Macros ease common tasks surlex: <slug:s> == surlex: <slug=[\w-]+> == regex: (?P<slug>[\w-]+)
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-]+)/
Matching without capturing Simply omit the variable name Macro matching a slug: <:s> (regex: [\w-]+) Regex matching a digit: <=\d> (regex: \d)
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 “$” work just like regex
Django Integration from surlex.dj import surl urlpatterns = patterns('', surl(r'^blog/<year:Y>/<month:M>/<day:d>/<slug:s>/$', blog.views.post_detail, name='blog_post_detail'), )
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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