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from __future__ import absolute_import |
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from __future__ import print_function |
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import os.path |
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import jinja2 |
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from .constants import (JINJA_MACROS_BASE_DEFINITIONS, |
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JINJA_MACROS_HIGHLEVEL_DEFINITIONS, |
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JINJA_MACROS_ANSIBLE_DEFINITIONS) |
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from .utils import required_key |
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class AbsolutePathFileSystemLoader(jinja2.BaseLoader): |
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"""Loads templates from the file system. This loader insists on absolute |
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paths and fails if a relative path is provided. |
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>>> loader = AbsolutePathFileSystemLoader() |
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Per default the template encoding is ``'utf-8'`` which can be changed |
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by setting the `encoding` parameter to something else. |
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""" |
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def __init__(self, encoding='utf-8'): |
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self.encoding = encoding |
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def get_source(self, environment, template): |
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if not os.path.isabs(template): |
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raise jinja2.TemplateNotFound(template) |
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template_file = jinja2.utils.open_if_exists(template) |
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if template_file is None: |
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raise jinja2.TemplateNotFound(template) |
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try: |
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contents = template_file.read().decode(self.encoding) |
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finally: |
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template_file.close() |
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mtime = os.path.getmtime(template) |
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def uptodate(): |
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try: |
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return os.path.getmtime(template) == mtime |
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except OSError: |
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return False |
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return contents, template, uptodate |
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def _get_jinja_environment(substitutions_dict): |
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if _get_jinja_environment.env is None: |
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bytecode_cache = None |
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if substitutions_dict.get("jinja2_cache_enabled") == "true": |
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bytecode_cache = jinja2.FileSystemBytecodeCache( |
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required_key(substitutions_dict, "jinja2_cache_dir") |
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) |
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# TODO: Choose better syntax? |
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_get_jinja_environment.env = jinja2.Environment( |
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block_start_string="{{%", |
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block_end_string="%}}", |
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variable_start_string="{{{", |
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variable_end_string="}}}", |
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comment_start_string="{{#", |
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comment_end_string="#}}", |
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loader=AbsolutePathFileSystemLoader(), |
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bytecode_cache=bytecode_cache |
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) |
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return _get_jinja_environment.env |
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_get_jinja_environment.env = None |
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def update_substitutions_dict(filename, substitutions_dict): |
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""" |
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Treat the given filename as a jinja2 file containing macro definitions, |
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and export definitions that don't start with _ into the substitutions_dict, |
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a name->macro dictionary. During macro compilation, symbols already |
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existing in substitutions_dict may be used by those definitions. |
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""" |
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template = _get_jinja_environment(substitutions_dict).get_template(filename) |
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all_symbols = template.make_module(substitutions_dict).__dict__ |
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for name, symbol in all_symbols.items(): |
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if name.startswith("_"): |
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continue |
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substitutions_dict[name] = symbol |
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def process_file(filepath, substitutions_dict): |
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""" |
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Process the jinja file at the given path with the specified |
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substitutions. Return the result as a string. Note that this will not |
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load the project macros; use process_file_with_macros(...) for that. |
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""" |
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filepath = os.path.abspath(filepath) |
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template = _get_jinja_environment(substitutions_dict).get_template(filepath) |
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return template.render(substitutions_dict) |
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def load_macros(substitutions_dict): |
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""" |
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Augment the substitutions_dict dict with project Jinja macros in /shared/. |
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""" |
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if substitutions_dict is None: |
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substitutions_dict = dict() |
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try: |
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update_substitutions_dict(JINJA_MACROS_BASE_DEFINITIONS, substitutions_dict) |
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update_substitutions_dict(JINJA_MACROS_HIGHLEVEL_DEFINITIONS, substitutions_dict) |
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update_substitutions_dict(JINJA_MACROS_ANSIBLE_DEFINITIONS, substitutions_dict) |
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except Exception as exc: |
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msg = ("Error extracting macro definitions: {0}" |
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.format(str(exc))) |
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raise RuntimeError(msg) |
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return substitutions_dict |
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def process_file_with_macros(filepath, substitutions_dict): |
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""" |
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Process the file with jinja macros at the given path with the specified |
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substitutions. Return the result as a string. |
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See also: process_file |
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""" |
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substitutions_dict = load_macros(substitutions_dict) |
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assert 'indent' not in substitutions_dict |
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return process_file(filepath, substitutions_dict) |
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ComplianceAsCode /
content
