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annotate env/lib/python3.9/site-packages/galaxy/util/template.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000 (2021-03-22)
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1 """Entry point for the usage of Cheetah templating within Galaxy."""
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2
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3 import traceback
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4 from lib2to3.refactor import RefactoringTool
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5
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6 import packaging.version
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7 from Cheetah.Compiler import Compiler
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8 from Cheetah.NameMapper import NotFound
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9 from Cheetah.Parser import ParseError
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10 from Cheetah.Template import Template
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11 from past.translation import myfixes
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12
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13 from . import unicodify
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14
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15 # Skip libpasteurize fixers, which make sure code is py2 and py3 compatible.
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16 # This is not needed, we only translate code on py3.
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17 myfixes = [f for f in myfixes if not f.startswith('libpasteurize')]
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18 refactoring_tool = RefactoringTool(myfixes, {'print_function': True})
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19
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20
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21 class FixedModuleCodeCompiler(Compiler):
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22
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23 module_code = None
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24
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25 def getModuleCode(self):
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26 self._moduleDef = self.module_code
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27 return self._moduleDef
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28
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29
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30 def create_compiler_class(module_code):
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31
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32 class CustomCompilerClass(FixedModuleCodeCompiler):
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33 pass
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34
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35 CustomCompilerClass.module_code = module_code
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36 return CustomCompilerClass
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37
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38
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39 def fill_template(template_text,
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40 context=None,
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41 retry=10,
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42 compiler_class=Compiler,
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43 first_exception=None,
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44 futurized=False,
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45 python_template_version='3',
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46 **kwargs):
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47 """Fill a cheetah template out for specified context.
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48
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49 If template_text is None, an exception will be thrown, if context
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50 is None (the default) - keyword arguments to this function will be used
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51 as the context.
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52 """
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53 if template_text is None:
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54 raise TypeError("Template text specified as None to fill_template.")
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55 if not context:
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56 context = kwargs
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57 if isinstance(python_template_version, str):
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58 python_template_version = packaging.version.parse(python_template_version)
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59 try:
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60 klass = Template.compile(source=template_text, compilerClass=compiler_class)
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61 except ParseError as e:
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62 # Might happen on invalid syntax within a cheetah statement, like `#if $smxsize <> 128.0`
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63 if first_exception is None:
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64 first_exception = e
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65 if python_template_version.release[0] < 3 and retry > 0:
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66 module_code = Template.compile(source=template_text, compilerClass=compiler_class, returnAClass=False).decode('utf-8')
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67 module_code = futurize_preprocessor(module_code)
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68 compiler_class = create_compiler_class(module_code)
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69 return fill_template(
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70 template_text=template_text,
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71 context=context,
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72 retry=retry - 1,
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73 compiler_class=compiler_class,
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74 first_exception=first_exception,
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75 python_template_version=python_template_version,
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76 )
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77 raise first_exception or e
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78 t = klass(searchList=[context])
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79 try:
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80 return unicodify(t, log_exception=False)
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81 except NotFound as e:
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82 if first_exception is None:
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83 first_exception = e
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84 if python_template_version.release[0] < 3 and retry > 0:
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85 tb = e.__traceback__
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86 last_stack = traceback.extract_tb(tb)[-1]
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87 if last_stack.name == '<listcomp>':
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88 # On python 3 list, dict and set comprehensions as well as generator expressions
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89 # have their own local scope, which prevents accessing frame variables in cheetah.
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90 # We can work around this by replacing `$var` with `var`, but we only do this for
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91 # list comprehensions, as this has never worked for dict or set comprehensions or
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92 # generator expressions in Cheetah.
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93 var_not_found = e.args[0].split("'")[1]
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94 replace_str = 'VFFSL(SL,"%s",True)' % var_not_found
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95 lineno = last_stack.lineno - 1
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96 module_code = t._CHEETAH_generatedModuleCode.splitlines()
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97 module_code[lineno] = module_code[lineno].replace(replace_str, var_not_found)
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98 module_code = "\n".join(module_code)
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99 compiler_class = create_compiler_class(module_code)
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100 return fill_template(template_text=template_text,
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101 context=context,
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102 retry=retry - 1,
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103 compiler_class=compiler_class,
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104 first_exception=first_exception,
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105 python_template_version=python_template_version,
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106 )
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107 raise first_exception or e
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108 except Exception as e:
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109 if first_exception is None:
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110 first_exception = e
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111 if python_template_version.release[0] < 3 and not futurized:
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112 # Possibly an error caused by attempting to run python 2
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113 # template code on python 3. Run the generated module code
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114 # through futurize and hope for the best.
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115 module_code = t._CHEETAH_generatedModuleCode
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116 module_code = futurize_preprocessor(module_code)
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117 compiler_class = create_compiler_class(module_code)
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118 return fill_template(template_text=template_text,
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119 context=context,
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120 retry=retry,
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121 compiler_class=compiler_class,
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122 first_exception=first_exception,
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123 futurized=True,
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124 python_template_version=python_template_version,
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125 )
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126 raise first_exception or e
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127
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128
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129 def futurize_preprocessor(source):
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130 source = str(refactoring_tool.refactor_string(source, name='auto_translate_cheetah'))
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131 # libfuturize.fixes.fix_unicode_keep_u' breaks from Cheetah.compat import unicode
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132 source = source.replace('from Cheetah.compat import str', 'from Cheetah.compat import unicode')
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133 return source