ó ,ņQc@sbdZddlmZddlmZddlmZdefd„ƒYZd„Zd„Z d S( s5 jinja2.meta ~~~~~~~~~~~ This module implements various functions that exposes information about templates that might be interesting for various kinds of applications. :copyright: (c) 2010 by the Jinja Team, see AUTHORS for more details. :license: BSD, see LICENSE for more details. i’’’’(tnodes(t CodeGenerator(t string_typestTrackingCodeGeneratorcBs)eZdZd„Zd„Zd„ZRS(s.We abuse the code generator for introspection.cCs&tj||ddƒtƒ|_dS(Ns(Rt__init__tsettundeclared_identifiers(tselft environment((s//usr/lib/python2.7/site-packages/jinja2/meta.pyRscCsdS(s Don't write.N((Rtx((s//usr/lib/python2.7/site-packages/jinja2/meta.pytwritescCs|jj|jjƒdS(s$Remember all undeclared identifiers.N(Rtupdatet identifierst undeclared(Rtframe((s//usr/lib/python2.7/site-packages/jinja2/meta.pyt pull_localss(t__name__t __module__t__doc__RR R(((s//usr/lib/python2.7/site-packages/jinja2/meta.pyRs  cCs#t|jƒ}|j|ƒ|jS(sReturns a set of all variables in the AST that will be looked up from the context at runtime. Because at compile time it's not known which variables will be used depending on the path the execution takes at runtime, all variables are returned. >>> from jinja2 import Environment, meta >>> env = Environment() >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}') >>> meta.find_undeclared_variables(ast) set(['bar']) .. admonition:: Implementation Internally the code generator is used for finding undeclared variables. This is good to know because the code generator might raise a :exc:`TemplateAssertionError` during compilation and as a matter of fact this function can currently raise that exception as well. (RRtvisitR(tasttcodegen((s//usr/lib/python2.7/site-packages/jinja2/meta.pytfind_undeclared_variables!s ccsKxD|jtjtjtjtjfƒD]}t|jtjƒs½t|jtj tj fƒr²xS|jj D]=}t|tjƒr¦t|j t ƒr«|j Vq«qndVqnWq(dVq(nt|jj t ƒrą|jj Vq(t|tjƒr>t|jj ttfƒr>x3|jj D]}t|t ƒr|VqqWq(dVq(WdS(sbFinds all the referenced templates from the AST. This will return an iterator over all the hardcoded template extensions, inclusions and imports. If dynamic inheritance or inclusion is used, `None` will be yielded. >>> from jinja2 import Environment, meta >>> env = Environment() >>> ast = env.parse('{% extends "layout.html" %}{% include helper %}') >>> list(meta.find_referenced_templates(ast)) ['layout.html', None] This function is useful for dependency tracking. For example if you want to rebuild parts of the website after a layout template has changed. N(tfind_allRtExtendst FromImporttImporttIncludet isinstancettemplatetConsttTupletListtitemstvalueRtNonettupletlist(Rtnodet template_name((s//usr/lib/python2.7/site-packages/jinja2/meta.pytfind_referenced_templates9s& N( Rtjinja2Rtjinja2.compilerRtjinja2._compatRRRR((((s//usr/lib/python2.7/site-packages/jinja2/meta.pyt s