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#!/usr/bin/env python
#
# Copyright 2008 The Closure Linter Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Classes to represent positions within strings."""
__author__ = ('robbyw@google.com (Robert Walker)',
'ajp@google.com (Andy Perelson)')
class Position(object):
"""Object representing a segment of a string.
Attributes:
start: The index in to the string where the segment starts.
length: The length of the string segment.
"""
def __init__(self, start, length):
"""Initialize the position object.
Args:
start: The start index.
length: The number of characters to include.
"""
self.start = start
self.length = length
def Get(self, string):
"""Returns this range of the given string.
Args:
string: The string to slice.
Returns:
The string within the range specified by this object.
"""
return string[self.start:self.start + self.length]
def Set(self, target, source):
"""Sets this range within the target string to the source string.
Args:
target: The target string.
source: The source string.
Returns:
The resulting string
"""
return target[:self.start] + source + target[self.start + self.length:]
def AtEnd(string):
"""Create a Position representing the end of the given string.
Args:
string: The string to represent the end of.
Returns:
The created Position object.
"""
return Position(len(string), 0)
AtEnd = staticmethod(AtEnd)
def IsAtEnd(self, string):
"""Returns whether this position is at the end of the given string.
Args:
string: The string to test for the end of.
Returns:
Whether this position is at the end of the given string.
"""
return self.start == len(string) and self.length == 0
def AtBeginning():
"""Create a Position representing the beginning of any string.
Returns:
The created Position object.
"""
return Position(0, 0)
AtBeginning = staticmethod(AtBeginning)
def IsAtBeginning(self):
"""Returns whether this position is at the beginning of any string.
Returns:
Whether this position is at the beginning of any string.
"""
return self.start == 0 and self.length == 0
def All(string):
"""Create a Position representing the entire string.
Args:
string: The string to represent the entirety of.
Returns:
The created Position object.
"""
return Position(0, len(string))
All = staticmethod(All)
def Index(index):
"""Returns a Position object for the specified index.
Args:
index: The index to select, inclusively.
Returns:
The created Position object.
"""
return Position(index, 1)
Index = staticmethod(Index)
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