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76 lines
3.3 KiB
C++
76 lines
3.3 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Portions of this file are from JUCE.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Please visit http://www.juce.com
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_TEXTDIFF_BEASTHEADER
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#define BEAST_TEXTDIFF_BEASTHEADER
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/**
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Calculates and applies a sequence of changes to convert one text string into
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another.
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Once created, the TextDiff object contains an array of change objects, where
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each change can be either an insertion or a deletion. When applied in order
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to the original string, these changes will convert it to the target string.
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*/
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class BEAST_API TextDiff
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{
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public:
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/** Creates a set of diffs for converting the original string into the target. */
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TextDiff (const String& original,
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const String& target);
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/** Applies this sequence of changes to the original string, producing the
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target string that was specified when generating them.
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Obviously it only makes sense to call this function with the string that
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was originally passed to the constructor. Any other input will produce an
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undefined result.
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*/
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String appliedTo (String text) const;
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/** Describes a change, which can be either an insertion or deletion. */
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struct Change
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{
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String insertedText; /**< If this change is a deletion, this string will be empty; otherwise,
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it'll be the text that should be inserted at the index specified by start. */
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int start; /**< Specifies the character index in a string at which text should be inserted or deleted. */
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int length; /**< If this change is a deletion, this specifies the number of characters to delete. For an
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insertion, this is the length of the new text being inserted. */
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/** Returns true if this change is a deletion, or false for an insertion. */
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bool isDeletion() const noexcept;
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/** Returns the result of applying this change to a string. */
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String appliedTo (const String& original) const noexcept;
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};
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/** The list of changes required to perform the transformation.
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Applying each of these, in order, to the original string will produce the target.
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*/
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Array<Change> changes;
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};
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#endif // BEAST_TEXTDIFF_BEASTHEADER
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