Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/jinja2/meta.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 # -*- coding: utf-8 -*-
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2 """Functions that expose information about templates that might be
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3 interesting for introspection.
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4 """
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5 from . import nodes
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6 from ._compat import iteritems
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7 from ._compat import string_types
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8 from .compiler import CodeGenerator
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9
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10
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11 class TrackingCodeGenerator(CodeGenerator):
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12 """We abuse the code generator for introspection."""
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13
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14 def __init__(self, environment):
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15 CodeGenerator.__init__(self, environment, "<introspection>", "<introspection>")
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16 self.undeclared_identifiers = set()
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17
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18 def write(self, x):
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19 """Don't write."""
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20
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21 def enter_frame(self, frame):
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22 """Remember all undeclared identifiers."""
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23 CodeGenerator.enter_frame(self, frame)
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24 for _, (action, param) in iteritems(frame.symbols.loads):
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25 if action == "resolve" and param not in self.environment.globals:
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26 self.undeclared_identifiers.add(param)
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27
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28
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29 def find_undeclared_variables(ast):
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30 """Returns a set of all variables in the AST that will be looked up from
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31 the context at runtime. Because at compile time it's not known which
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32 variables will be used depending on the path the execution takes at
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33 runtime, all variables are returned.
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34
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35 >>> from jinja2 import Environment, meta
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36 >>> env = Environment()
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37 >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}')
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38 >>> meta.find_undeclared_variables(ast) == set(['bar'])
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39 True
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40
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41 .. admonition:: Implementation
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42
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43 Internally the code generator is used for finding undeclared variables.
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44 This is good to know because the code generator might raise a
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45 :exc:`TemplateAssertionError` during compilation and as a matter of
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46 fact this function can currently raise that exception as well.
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47 """
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48 codegen = TrackingCodeGenerator(ast.environment)
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49 codegen.visit(ast)
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50 return codegen.undeclared_identifiers
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51
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52
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53 def find_referenced_templates(ast):
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54 """Finds all the referenced templates from the AST. This will return an
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55 iterator over all the hardcoded template extensions, inclusions and
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56 imports. If dynamic inheritance or inclusion is used, `None` will be
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57 yielded.
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58
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59 >>> from jinja2 import Environment, meta
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60 >>> env = Environment()
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61 >>> ast = env.parse('{% extends "layout.html" %}{% include helper %}')
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62 >>> list(meta.find_referenced_templates(ast))
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63 ['layout.html', None]
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64
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65 This function is useful for dependency tracking. For example if you want
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66 to rebuild parts of the website after a layout template has changed.
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67 """
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68 for node in ast.find_all(
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69 (nodes.Extends, nodes.FromImport, nodes.Import, nodes.Include)
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70 ):
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71 if not isinstance(node.template, nodes.Const):
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72 # a tuple with some non consts in there
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73 if isinstance(node.template, (nodes.Tuple, nodes.List)):
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74 for template_name in node.template.items:
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75 # something const, only yield the strings and ignore
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76 # non-string consts that really just make no sense
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77 if isinstance(template_name, nodes.Const):
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78 if isinstance(template_name.value, string_types):
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79 yield template_name.value
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80 # something dynamic in there
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81 else:
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82 yield None
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83 # something dynamic we don't know about here
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84 else:
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85 yield None
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86 continue
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87 # constant is a basestring, direct template name
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88 if isinstance(node.template.value, string_types):
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89 yield node.template.value
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90 # a tuple or list (latter *should* not happen) made of consts,
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91 # yield the consts that are strings. We could warn here for
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92 # non string values
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93 elif isinstance(node, nodes.Include) and isinstance(
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94 node.template.value, (tuple, list)
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95 ):
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96 for template_name in node.template.value:
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97 if isinstance(template_name, string_types):
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98 yield template_name
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99 # something else we don't care about, we could warn here
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100 else:
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101 yield None