Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/galaxy/util/template.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 """Entry point for the usage of Cheetah templating within Galaxy."""
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2 from __future__ import absolute_import
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3
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4 import sys
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5 import traceback
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6 from lib2to3.refactor import RefactoringTool
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7
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8 import packaging.version
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9 from Cheetah.Compiler import Compiler
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10 from Cheetah.NameMapper import NotFound
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11 from Cheetah.Template import Template
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12 from past.translation import myfixes
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13
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14 from . import unicodify
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15
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16 # Skip libpasteurize fixers, which make sure code is py2 and py3 compatible.
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17 # This is not needed, we only translate code on py3.
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18 if sys.version_info.major > 2:
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19 myfixes = [f for f in myfixes if not f.startswith('libpasteurize')]
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20 refactoring_tool = RefactoringTool(myfixes, {'print_function': True})
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21 else:
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22 myfixes = refactoring_tool = None
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23
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24
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25 class FixedModuleCodeCompiler(Compiler):
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26
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27 module_code = None
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28
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29 def getModuleCode(self):
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30 self._moduleDef = self.module_code
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31 return self._moduleDef
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32
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33
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34 def create_compiler_class(module_code):
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35
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36 class CustomCompilerClass(FixedModuleCodeCompiler):
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37 pass
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38
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39 setattr(CustomCompilerClass, 'module_code', module_code)
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40
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41 return CustomCompilerClass
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42
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43
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44 def fill_template(template_text,
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45 context=None,
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46 retry=10,
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47 compiler_class=Compiler,
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48 first_exception=None,
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49 futurized=False,
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50 python_template_version='3',
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51 **kwargs):
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52 """Fill a cheetah template out for specified context.
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53
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54 If template_text is None, an exception will be thrown, if context
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55 is None (the default) - keyword arguments to this function will be used
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56 as the context.
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57 """
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58 if template_text is None:
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59 raise TypeError("Template text specified as None to fill_template.")
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60 if not context:
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61 context = kwargs
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62 if isinstance(python_template_version, str):
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63 python_template_version = packaging.version.parse(python_template_version)
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64 klass = Template.compile(source=template_text, compilerClass=compiler_class)
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65 t = klass(searchList=[context])
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66 try:
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67 return unicodify(t)
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68 except NotFound as e:
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69 if first_exception is None:
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70 first_exception = e
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71 if refactoring_tool and python_template_version.release[0] < 3 and retry > 0:
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72 tb = e.__traceback__
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73 last_stack = traceback.extract_tb(tb)[-1]
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74 if last_stack.name == '<listcomp>':
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75 # On python 3 list, dict and set comprehensions as well as generator expressions
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76 # have their own local scope, which prevents accessing frame variables in cheetah.
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77 # We can work around this by replacing `$var` with `var`, but we only do this for
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78 # list comprehensions, as this has never worked for dict or set comprehensions or
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79 # generator expressions in Cheetah.
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80 var_not_found = e.args[0].split("'")[1]
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81 replace_str = 'VFFSL(SL,"%s",True)' % var_not_found
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82 lineno = last_stack.lineno - 1
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83 module_code = t._CHEETAH_generatedModuleCode.splitlines()
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84 module_code[lineno] = module_code[lineno].replace(replace_str, var_not_found)
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85 module_code = "\n".join(module_code)
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86 compiler_class = create_compiler_class(module_code)
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87 return fill_template(template_text=template_text,
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88 context=context,
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89 retry=retry - 1,
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90 compiler_class=compiler_class,
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91 first_exception=first_exception,
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92 python_template_version=python_template_version,
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93 )
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94 raise first_exception or e
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95 except Exception as e:
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96 if first_exception is None:
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97 first_exception = e
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98 if sys.version_info.major > 2 and python_template_version.release[0] < 3 and not futurized:
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99 # Possibly an error caused by attempting to run python 2
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100 # template code on python 3. Run the generated module code
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101 # through futurize and hope for the best.
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102 module_code = t._CHEETAH_generatedModuleCode
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103 module_code = futurize_preprocessor(module_code)
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104 compiler_class = create_compiler_class(module_code)
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105 return fill_template(template_text=template_text,
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106 context=context,
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107 retry=retry,
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108 compiler_class=compiler_class,
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109 first_exception=first_exception,
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110 futurized=True,
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111 python_template_version=python_template_version,
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112 )
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113 raise first_exception or e
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114
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115
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116 def futurize_preprocessor(source):
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117 source = str(refactoring_tool.refactor_string(source, name='auto_translate_cheetah'))
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118 # libfuturize.fixes.fix_unicode_keep_u' breaks from Cheetah.compat import unicode
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119 source = source.replace('from Cheetah.compat import str', 'from Cheetah.compat import unicode')
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120 return source