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# This code is part of Ansible, but is an independent component. # This particular file snippet, and this file snippet only, is BSD licensed. # Modules you write using this snippet, which is embedded dynamically by Ansible # still belong to the author of the module, and may assign their own license # to the complete work. # # Copyright (c), Michael DeHaan <michael.dehaan@gmail.com>, 2012-2013 # All rights reserved. # # Redistribution and use in source and binary forms, with or without modification, # are permitted provided that the following conditions are met: # # * Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above copyright notice, # this list of conditions and the following disclaimer in the documentation # and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. # IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE # USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. from __future__ import (absolute_import, division, print_function) __metaclass__ = type def _get_quote_state(token, quote_char): ''' the goal of this block is to determine if the quoted string is unterminated in which case it needs to be put back together ''' # the char before the current one, used to see if # the current character is escaped prev_char = None for idx, cur_char in enumerate(token): if idx > 0: prev_char = token[idx - 1] if cur_char in '"\'' and prev_char != '\\': if quote_char: if cur_char == quote_char: quote_char = None else: quote_char = cur_char return quote_char def _count_jinja2_blocks(token, cur_depth, open_token, close_token): ''' this function counts the number of opening/closing blocks for a given opening/closing type and adjusts the current depth for that block based on the difference ''' num_open = token.count(open_token) num_close = token.count(close_token) if num_open != num_close: cur_depth += (num_open - num_close) if cur_depth < 0: cur_depth = 0 return cur_depth def split_args(args): ''' Splits args on whitespace, but intelligently reassembles those that may have been split over a jinja2 block or quotes. When used in a remote module, we won't ever have to be concerned about jinja2 blocks, however this function is/will be used in the core portions as well before the args are templated. example input: a=b c="foo bar" example output: ['a=b', 'c="foo bar"'] Basically this is a variation shlex that has some more intelligence for how Ansible needs to use it. ''' # the list of params parsed out of the arg string # this is going to be the result value when we are donei params = [] # here we encode the args, so we have a uniform charset to # work with, and split on white space args = args.strip() try: args = args.encode('utf-8') do_decode = True except UnicodeDecodeError: do_decode = False items = args.split('\n') # iterate over the tokens, and reassemble any that may have been # split on a space inside a jinja2 block. # ex if tokens are "{{", "foo", "}}" these go together # These variables are used # to keep track of the state of the parsing, since blocks and quotes # may be nested within each other. quote_char = None inside_quotes = False print_depth = 0 # used to count nested jinja2 {{ }} blocks block_depth = 0 # used to count nested jinja2 {% %} blocks comment_depth = 0 # used to count nested jinja2 {# #} blocks # now we loop over each split chunk, coalescing tokens if the white space # split occurred within quotes or a jinja2 block of some kind for itemidx, item in enumerate(items): # we split on spaces and newlines separately, so that we # can tell which character we split on for reassembly # inside quotation characters tokens = item.strip().split(' ') line_continuation = False for idx, token in enumerate(tokens): # if we hit a line continuation character, but # we're not inside quotes, ignore it and continue # on to the next token while setting a flag if token == '\\' and not inside_quotes: line_continuation = True continue # store the previous quoting state for checking later was_inside_quotes = inside_quotes quote_char = _get_quote_state(token, quote_char) inside_quotes = quote_char is not None # multiple conditions may append a token to the list of params, # so we keep track with this flag to make sure it only happens once # append means add to the end of the list, don't append means concatenate # it to the end of the last token appended = False # if we're inside quotes now, but weren't before, append the token # to the end of the list, since we'll tack on more to it later # otherwise, if we're inside any jinja2 block, inside quotes, or we were # inside quotes (but aren't now) concat this token to the last param if inside_quotes and not was_inside_quotes: params.append(token) appended = True elif print_depth or block_depth or comment_depth or inside_quotes or was_inside_quotes: if idx == 0 and not inside_quotes and was_inside_quotes: params[-1] = "%s%s" % (params[-1], token) elif len(tokens) > 1: spacer = '' if idx > 0: spacer = ' ' params[-1] = "%s%s%s" % (params[-1], spacer, token) else: spacer = '' if not params[-1].endswith('\n') and idx == 0: spacer = '\n' params[-1] = "%s%s%s" % (params[-1], spacer, token) appended = True # if the number of paired block tags is not the same, the depth has changed, so we calculate that here # and may append the current token to the params (if we haven't previously done so) prev_print_depth = print_depth print_depth = _count_jinja2_blocks(token, print_depth, "{{", "}}") if print_depth != prev_print_depth and not appended: params.append(token) appended = True prev_block_depth = block_depth block_depth = _count_jinja2_blocks(token, block_depth, "{%", "%}") if block_depth != prev_block_depth and not appended: params.append(token) appended = True prev_comment_depth = comment_depth comment_depth = _count_jinja2_blocks(token, comment_depth, "{#", "#}") if comment_depth != prev_comment_depth and not appended: params.append(token) appended = True # finally, if we're at zero depth for all blocks and not inside quotes, and have not # yet appended anything to the list of params, we do so now if not (print_depth or block_depth or comment_depth) and not inside_quotes and not appended and token != '': params.append(token) # if this was the last token in the list, and we have more than # one item (meaning we split on newlines), add a newline back here # to preserve the original structure if len(items) > 1 and itemidx != len(items) - 1 and not line_continuation: if not params[-1].endswith('\n') or item == '': params[-1] += '\n' # always clear the line continuation flag line_continuation = False # If we're done and things are not at zero depth or we're still inside quotes, # raise an error to indicate that the args were unbalanced if print_depth or block_depth or comment_depth or inside_quotes: raise Exception("error while splitting arguments, either an unbalanced jinja2 block or quotes") # finally, we decode each param back to the unicode it was in the arg string if do_decode: params = [x.decode('utf-8') for x in params] return params def is_quoted(data): return len(data) > 0 and (data[0] == '"' and data[-1] == '"' or data[0] == "'" and data[-1] == "'") def unquote(data): ''' removes first and last quotes from a string, if the string starts and ends with the same quotes ''' if is_quoted(data): return data[1:-1] return data