| # -*- coding: utf-8 -*- |
| # Copyright 2010-2015, Google Inc. |
| # 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. |
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| # contributors may be used to endorse or promote products derived from |
| # this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| |
| """Library replacing targets formmated ${like_this} with specified variables. |
| """ |
| |
| __author__ = "komatsu" |
| |
| import re |
| |
| def ReplaceVariables(data, environment): |
| """Replace all occurrence of the variable in data by the value. |
| |
| Args: |
| data: the original data string |
| environment: a dict which maps from variable names to their values |
| |
| Returns: |
| the data string which replaces the variables by the value. |
| """ |
| def Replacer(matchobj): |
| """The replace function to expand variables |
| |
| Args: |
| matchobj: the match object |
| |
| Returns: |
| The value for the variable if the variable is defined in the |
| environment. Otherwise original string is returned. |
| """ |
| if environment.has_key(matchobj.group(1)): |
| return environment[matchobj.group(1)] |
| return matchobj.group(0) |
| |
| return re.sub(r'\$\{(\w+)\}', Replacer, data) |