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| 1 #!/usr/bin/env python | |
| 2 # | |
| 3 # Copyright 2007 The Closure Linter Authors. All Rights Reserved. | |
| 4 # | |
| 5 # Licensed under the Apache License, Version 2.0 (the "License"); | |
| 6 # you may not use this file except in compliance with the License. | |
| 7 # You may obtain a copy of the License at | |
| 8 # | |
| 9 # http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 # | |
| 11 # Unless required by applicable law or agreed to in writing, software | |
| 12 # distributed under the License is distributed on an "AS-IS" BASIS, | |
| 13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 # See the License for the specific language governing permissions and | |
| 15 # limitations under the License. | |
| 16 | |
| 17 """Regular expression based JavaScript matcher classes.""" | |
| 18 | |
| 19 __author__ = ('robbyw@google.com (Robert Walker)', | |
| 20 'ajp@google.com (Andy Perelson)') | |
| 21 | |
| 22 from closure_linter.common import position | |
| 23 from closure_linter.common import tokens | |
| 24 | |
| 25 # Shorthand | |
| 26 Token = tokens.Token | |
| 27 Position = position.Position | |
| 28 | |
| 29 | |
| 30 class Matcher(object): | |
| 31 """A token matcher. | |
| 32 | |
| 33 Specifies a pattern to match, the type of token it represents, what mode the | |
| 34 token changes to, and what mode the token applies to. | |
| 35 | |
| 36 Modes allow more advanced grammars to be incorporated, and are also necessary | |
| 37 to tokenize line by line. We can have different patterns apply to different | |
| 38 modes - i.e. looking for documentation while in comment mode. | |
| 39 | |
| 40 Attributes: | |
| 41 regex: The regular expression representing this matcher. | |
| 42 type: The type of token indicated by a successful match. | |
| 43 result_mode: The mode to move to after a successful match. | |
| 44 """ | |
| 45 | |
| 46 def __init__(self, regex, token_type, result_mode=None, line_start=False): | |
| 47 """Create a new matcher template. | |
| 48 | |
| 49 Args: | |
| 50 regex: The regular expression to match. | |
| 51 token_type: The type of token a successful match indicates. | |
| 52 result_mode: What mode to change to after a successful match. Defaults to | |
| 53 None, which means to not change the current mode. | |
| 54 line_start: Whether this matcher should only match string at the start | |
| 55 of a line. | |
| 56 """ | |
| 57 self.regex = regex | |
| 58 self.type = token_type | |
| 59 self.result_mode = result_mode | |
| 60 self.line_start = line_start | |
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