# (c) 2017, Toshio Kuratomi # # This file is part of Ansible # # Ansible is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # Ansible is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Ansible. If not, see . # Make coding more python3-ish from __future__ import (absolute_import, division, print_function) __metaclass__ = type import ast import yaml from ansible.module_utils._text import to_text class ParseError(Exception): """Thrown when parsing a file fails""" pass def _seek_end_of_dict(module_data, start_line, start_col, next_node_line, next_node_col): """Look for the end of a dict in a set of lines We know the starting position of the dict and we know the start of the next code node but in between there may be multiple newlines and comments. There may also be multiple python statements on the same line (separated by semicolons) Examples:: ANSIBLE_METADATA = {[..]} DOCUMENTATION = [..] ANSIBLE_METADATA = {[..]} # Optional comments with confusing junk => {} # Optional comments {} DOCUMENTATION = [..] ANSIBLE_METADATA = { [..] } # Optional comments {} DOCUMENTATION = [..] ANSIBLE_METADATA = {[..]} ; DOCUMENTATION = [..] ANSIBLE_METADATA = {}EOF """ if next_node_line is None: # The dict is the last statement in the file snippet = module_data.splitlines()[start_line:] next_node_col = 0 # Include the last line in the file last_line_offset = 0 else: # It's somewhere in the middle so we need to separate it from the rest snippet = module_data.splitlines()[start_line:next_node_line] # Do not include the last line because that's where the next node # starts last_line_offset = 1 if next_node_col == 0: # This handles all variants where there are only comments and blank # lines between the dict and the next code node # Step backwards through all the lines in the snippet for line_idx, line in tuple(reversed(tuple(enumerate(snippet))))[last_line_offset:]: end_col = None # Step backwards through all the characters in the line for col_idx, char in reversed(tuple(enumerate(c for c in line))): if not isinstance(char, bytes): # Python3 wart. slicing a byte string yields integers char = bytes((char,)) if char == b'}' and end_col is None: # Potentially found the end of the dict end_col = col_idx elif char == b'#' and end_col is not None: # The previous '}' was part of a comment. Keep trying end_col = None if end_col is not None: # Found the end! end_line = start_line + line_idx break else: raise ParseError('Unable to find the end of dictionary') else: # Harder cases involving multiple statements on one line # Good Ansible Module style doesn't do this so we're just going to # treat this as an error for now: raise ParseError('Multiple statements per line confuses the module metadata parser.') return end_line, end_col def _seek_end_of_string(module_data, start_line, start_col, next_node_line, next_node_col): """ This is much trickier than finding the end of a dict. A dict has only one ending character, "}". Strings have four potential ending characters. We have to parse the beginning of the string to determine what the ending character will be. Examples: ANSIBLE_METADATA = '''[..]''' # Optional comment with confusing chars ''' # Optional comment with confusing chars ''' DOCUMENTATION = [..] ANSIBLE_METADATA = ''' [..] ''' DOCUMENTATIONS = [..] ANSIBLE_METADATA = '''[..]''' ; DOCUMENTATION = [..] SHORT_NAME = ANSIBLE_METADATA = '''[..]''' ; DOCUMENTATION = [..] String marker variants: * '[..]' * "[..]" * '''[..]''' * \"\"\"[..]\"\"\" Each of these come in u, r, and b variants: * '[..]' * u'[..]' * b'[..]' * r'[..]' * ur'[..]' * ru'[..]' * br'[..]' * b'[..]' * rb'[..]' """ raise NotImplementedError('Finding end of string not yet implemented') def extract_metadata(module_data): """Extract the metadata from a module :arg module_data: Byte string containing a module's code :returns: a tuple of metadata (a dict), line the metadata starts on, column the metadata starts on, line the metadata ends on, column the metadata ends on, and the names the metadata is assigned to. One of the names the metadata is assigned to will be ANSIBLE_METADATA If no metadata is found, the tuple will be (None, -1, -1, -1, -1, None) """ metadata = None start_line = -1 start_col = -1 end_line = -1 end_col = -1 targets = None mod_ast_tree = ast.parse(module_data) for root_idx, child in enumerate(mod_ast_tree.body): if isinstance(child, ast.Assign): for target in child.targets: if target.id == 'ANSIBLE_METADATA': metadata = ast.literal_eval(child.value) try: # Determine where the next node starts next_node = mod_ast_tree.body[root_idx + 1] next_lineno = next_node.lineno next_col_offset = next_node.col_offset except IndexError: # Metadata is defined in the last node of the file next_lineno = None next_col_offset = None if isinstance(child.value, ast.Dict): # Determine where the current metadata ends end_line, end_col = _seek_end_of_dict(module_data, child.lineno - 1, child.col_offset, next_lineno, next_col_offset) elif isinstance(child.value, ast.Str): metadata = yaml.safe_load(child.value.s) end_line, end_col = _seek_end_of_string(module_data, child.lineno - 1, child.col_offset, next_lineno, next_col_offset) elif isinstance(child.value, ast.Bytes): metadata = yaml.safe_load(to_text(child.value.s, errors='surrogate_or_strict')) end_line, end_col = _seek_end_of_string(module_data, child.lineno - 1, child.col_offset, next_lineno, next_col_offset) else: # Example: # ANSIBLE_METADATA = 'junk' # ANSIBLE_METADATA = { [..the real metadata..] } continue # Do these after the if-else so we don't pollute them in # case this was a false positive start_line = child.lineno - 1 start_col = child.col_offset targets = [t.id for t in child.targets] break if metadata is not None: # Once we've found the metadata we're done break return metadata, start_line, start_col, end_line, end_col, targets