649 lines
18 KiB
Java
649 lines
18 KiB
Java
/* GENERATED SOURCE. DO NOT MODIFY. */
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// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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*/
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package android.icu.lang;
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import android.icu.text.UTF16;
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/**
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* <code>UScriptRun</code> is used to find runs of characters in
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* the same script, as defined in the <code>UScript</code> class.
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* It implements a simple iterator over an array of characters.
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* The iterator will assign <code>COMMON</code> and <code>INHERITED</code>
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* characters to the same script as the preceding characters. If the
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* COMMON and INHERITED characters are first, they will be assigned to
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* the same script as the following characters.
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*
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* The iterator will try to match paired punctuation. If it sees an
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* opening punctuation character, it will remember the script that
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* was assigned to that character, and assign the same script to the
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* matching closing punctuation.
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*
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* No attempt is made to combine related scripts into a single run. In
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* particular, Hiragana, Katakana, and Han characters will appear in separate
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* runs.
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* Here is an example of how to iterate over script runs:
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* <pre>
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* void printScriptRuns(char[] text)
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* {
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* UScriptRun scriptRun = new UScriptRun(text);
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*
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* while (scriptRun.next()) {
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* int start = scriptRun.getScriptStart();
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* int limit = scriptRun.getScriptLimit();
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* int script = scriptRun.getScriptCode();
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*
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* System.out.println("Script \"" + UScript.getName(script) + "\" from " +
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* start + " to " + limit + ".");
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* }
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* }
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* </pre>
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*
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* @deprecated This API is ICU internal only.
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* @hide Only a subset of ICU is exposed in Android
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final class UScriptRun
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{
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/**
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* Construct an empty <code>UScriptRun</code> object. The <code>next()</code>
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* method will return <code>false</code> the first time it is called.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public UScriptRun()
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{
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char[] nullChars = null;
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reset(nullChars, 0, 0);
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}
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/**
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* Construct a <code>UScriptRun</code> object which iterates over the
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* characters in the given string.
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*
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* @param text the string of characters over which to iterate.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public UScriptRun(String text)
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{
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reset (text);
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}
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/**
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* Construct a <code>UScriptRun</code> object which iterates over a subrange
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* of the characters in the given string.
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*
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* @param text the string of characters over which to iterate.
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* @param start the index of the first character over which to iterate
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* @param count the number of characters over which to iterate
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public UScriptRun(String text, int start, int count)
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{
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reset(text, start, count);
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}
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/**
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* Construct a <code>UScriptRun</code> object which iterates over the given
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* characters.
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*
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* @param chars the array of characters over which to iterate.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public UScriptRun(char[] chars)
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{
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reset(chars);
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}
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/**
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* Construct a <code>UScriptRun</code> object which iterates over a subrange
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* of the given characters.
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*
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* @param chars the array of characters over which to iterate.
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* @param start the index of the first character over which to iterate
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* @param count the number of characters over which to iterate
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public UScriptRun(char[] chars, int start, int count)
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{
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reset(chars, start, count);
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}
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/**
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* Reset the iterator to the start of the text.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final void reset()
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{
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// empty any old parenStack contents.
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// NOTE: this is not the most efficient way
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// to do this, but it's the easiest to write...
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while (stackIsNotEmpty()) {
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pop();
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}
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scriptStart = textStart;
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scriptLimit = textStart;
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scriptCode = UScript.INVALID_CODE;
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parenSP = -1;
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pushCount = 0;
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fixupCount = 0;
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textIndex = textStart;
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}
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/**
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* Reset the iterator to iterate over the given range of the text. Throws
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* IllegalArgumentException if the range is outside of the bounds of the
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* character array.
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*
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* @param start the index of the new first character over which to iterate
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* @param count the new number of characters over which to iterate.
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* @exception IllegalArgumentException If invalid arguments are passed.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final void reset(int start, int count)
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throws IllegalArgumentException
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{
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int len = 0;
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if (text != null) {
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len = text.length;
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}
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if (start < 0 || count < 0 || start > len - count) {
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throw new IllegalArgumentException();
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}
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textStart = start;
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textLimit = start + count;
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reset();
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}
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/**
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* Reset the iterator to iterate over <code>count</code> characters
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* in <code>chars</code> starting at <code>start</code>. This allows
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* clients to reuse an iterator.
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*
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* @param chars the new array of characters over which to iterate.
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* @param start the index of the first character over which to iterate.
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* @param count the number of characters over which to iterate.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final void reset(char[] chars, int start, int count)
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{
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if (chars == null) {
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chars = emptyCharArray;
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}
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text = chars;
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reset(start, count);
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}
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/**
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* Reset the iterator to iterate over the characters
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* in <code>chars</code>. This allows clients to reuse an iterator.
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*
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* @param chars the new array of characters over which to iterate.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final void reset(char[] chars)
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{
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int length = 0;
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if (chars != null) {
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length = chars.length;
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}
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reset(chars, 0, length);
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}
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/**
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* Reset the iterator to iterate over <code>count</code> characters
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* in <code>text</code> starting at <code>start</code>. This allows
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* clients to reuse an iterator.
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*
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* @param str the new string of characters over which to iterate.
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* @param start the index of the first character over which to iterate.
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* @param count the nuber of characters over which to iterate.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final void reset(String str, int start, int count)
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{
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char[] chars = null;
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if (str != null) {
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chars = str.toCharArray();
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}
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reset(chars, start, count);
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}
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/**
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* Reset the iterator to iterate over the characters
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* in <code>text</code>. This allows clients to reuse an iterator.
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*
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* @param str the new string of characters over which to iterate.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final void reset(String str)
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{
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int length = 0;
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if (str != null) {
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length = str.length();
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}
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reset(str, 0, length);
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}
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/**
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* Get the starting index of the current script run.
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*
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* @return the index of the first character in the current script run.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final int getScriptStart()
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{
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return scriptStart;
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}
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/**
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* Get the index of the first character after the current script run.
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*
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* @return the index of the first character after the current script run.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final int getScriptLimit()
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{
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return scriptLimit;
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}
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/**
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* Get the script code for the script of the current script run.
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*
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* @return the script code for the script of the current script run.
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* @see android.icu.lang.UScript
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final int getScriptCode()
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{
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return scriptCode;
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}
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/**
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* Find the next script run. Returns <code>false</code> if there
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* isn't another run, returns <code>true</code> if there is.
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*
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* @return <code>false</code> if there isn't another run, <code>true</code> if there is.
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*
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* @deprecated This API is ICU internal only.
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* @hide draft / provisional / internal are hidden on Android
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*/
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@Deprecated
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public final boolean next()
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{
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// if we've fallen off the end of the text, we're done
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if (scriptLimit >= textLimit) {
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return false;
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}
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scriptCode = UScript.COMMON;
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scriptStart = scriptLimit;
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syncFixup();
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while (textIndex < textLimit) {
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int ch = UTF16.charAt(text, textStart, textLimit, textIndex - textStart);
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int codePointCount = UTF16.getCharCount(ch);
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int sc = UScript.getScript(ch);
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int pairIndex = getPairIndex(ch);
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textIndex += codePointCount;
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// Paired character handling:
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//
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// if it's an open character, push it onto the stack.
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// if it's a close character, find the matching open on the
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// stack, and use that script code. Any non-matching open
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// characters above it on the stack will be poped.
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if (pairIndex >= 0) {
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if ((pairIndex & 1) == 0) {
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push(pairIndex, scriptCode);
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} else {
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int pi = pairIndex & ~1;
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while (stackIsNotEmpty() && top().pairIndex != pi) {
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pop();
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}
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if (stackIsNotEmpty()) {
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sc = top().scriptCode;
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}
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}
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}
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if (sameScript(scriptCode, sc)) {
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if (scriptCode <= UScript.INHERITED && sc > UScript.INHERITED) {
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scriptCode = sc;
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fixup(scriptCode);
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}
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// if this character is a close paired character,
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// pop the matching open character from the stack
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if (pairIndex >= 0 && (pairIndex & 1) != 0) {
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pop();
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}
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} else {
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// We've just seen the first character of
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// the next run. Back over it so we'll see
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// it again the next time.
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textIndex -= codePointCount;
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break;
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}
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}
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scriptLimit = textIndex;
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return true;
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}
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/**
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* Compare two script codes to see if they are in the same script. If one script is
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* a strong script, and the other is INHERITED or COMMON, it will compare equal.
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*
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* @param scriptOne one of the script codes.
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* @param scriptTwo the other script code.
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* @return <code>true</code> if the two scripts are the same.
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* @see android.icu.lang.UScript
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*/
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private static boolean sameScript(int scriptOne, int scriptTwo)
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{
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return scriptOne <= UScript.INHERITED || scriptTwo <= UScript.INHERITED || scriptOne == scriptTwo;
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}
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/*
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* An internal class which holds entries on the paren stack.
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*/
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private static final class ParenStackEntry
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{
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int pairIndex;
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int scriptCode;
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public ParenStackEntry(int thePairIndex, int theScriptCode)
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{
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pairIndex = thePairIndex;
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scriptCode = theScriptCode;
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}
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}
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private static final int mod(int sp)
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{
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return sp % PAREN_STACK_DEPTH;
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}
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private static final int inc(int sp, int count)
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{
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return mod(sp + count);
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}
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private static final int inc(int sp)
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{
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return inc(sp, 1);
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}
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private static final int dec(int sp, int count)
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{
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return mod(sp + PAREN_STACK_DEPTH - count);
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}
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private static final int dec(int sp)
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{
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return dec(sp, 1);
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}
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private static final int limitInc(int count)
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{
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if (count < PAREN_STACK_DEPTH) {
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count += 1;
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}
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return count;
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}
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private final boolean stackIsEmpty()
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{
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return pushCount <= 0;
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}
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private final boolean stackIsNotEmpty()
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{
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return ! stackIsEmpty();
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}
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private final void push(int pairIndex, int scrptCode)
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{
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pushCount = limitInc(pushCount);
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fixupCount = limitInc(fixupCount);
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parenSP = inc(parenSP);
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parenStack[parenSP] = new ParenStackEntry(pairIndex, scrptCode);
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}
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private final void pop()
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{
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if (stackIsEmpty()) {
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return;
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}
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parenStack[parenSP] = null;
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if (fixupCount > 0) {
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fixupCount -= 1;
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}
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pushCount -= 1;
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parenSP = dec(parenSP);
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// If the stack is now empty, reset the stack
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// pointers to their initial values.
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if (stackIsEmpty()) {
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parenSP = -1;
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}
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}
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private final ParenStackEntry top()
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{
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return parenStack[parenSP];
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}
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private final void syncFixup()
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{
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fixupCount = 0;
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}
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private final void fixup(int scrptCode)
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{
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int fixupSP = dec(parenSP, fixupCount);
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while (fixupCount-- > 0) {
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fixupSP = inc(fixupSP);
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parenStack[fixupSP].scriptCode = scrptCode;
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}
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}
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private char[] emptyCharArray = {};
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private char[] text;
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private int textIndex;
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private int textStart;
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private int textLimit;
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private int scriptStart;
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private int scriptLimit;
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private int scriptCode;
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private static int PAREN_STACK_DEPTH = 32;
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private static ParenStackEntry parenStack[] = new ParenStackEntry[PAREN_STACK_DEPTH];
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private int parenSP = -1;
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private int pushCount = 0;
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private int fixupCount = 0;
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/**
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* Find the highest bit that's set in a word. Uses a binary search through
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* the bits.
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*
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* @param n the word in which to find the highest bit that's set.
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* @return the bit number (counting from the low order bit) of the highest bit.
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*/
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private static final byte highBit(int n)
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{
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if (n <= 0) {
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return -32;
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}
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byte bit = 0;
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if (n >= 1 << 16) {
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n >>= 16;
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bit += 16;
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}
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if (n >= 1 << 8) {
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n >>= 8;
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bit += 8;
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}
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if (n >= 1 << 4) {
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n >>= 4;
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bit += 4;
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}
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if (n >= 1 << 2) {
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n >>= 2;
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bit += 2;
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}
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if (n >= 1 << 1) {
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n >>= 1;
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bit += 1;
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}
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return bit;
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}
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/**
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* Search the pairedChars array for the given character.
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*
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* @param ch the character for which to search.
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* @return the index of the character in the table, or -1 if it's not there.
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*/
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private static int getPairIndex(int ch)
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{
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int probe = pairedCharPower;
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int index = 0;
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|
|
|
if (ch >= pairedChars[pairedCharExtra]) {
|
|
index = pairedCharExtra;
|
|
}
|
|
|
|
while (probe > (1 << 0)) {
|
|
probe >>= 1;
|
|
|
|
if (ch >= pairedChars[index + probe]) {
|
|
index += probe;
|
|
}
|
|
}
|
|
|
|
if (pairedChars[index] != ch) {
|
|
index = -1;
|
|
}
|
|
|
|
return index;
|
|
}
|
|
|
|
private static int pairedChars[] = {
|
|
0x0028, 0x0029, // ascii paired punctuation
|
|
0x003c, 0x003e,
|
|
0x005b, 0x005d,
|
|
0x007b, 0x007d,
|
|
0x00ab, 0x00bb, // guillemets
|
|
0x2018, 0x2019, // general punctuation
|
|
0x201c, 0x201d,
|
|
0x2039, 0x203a,
|
|
0x3008, 0x3009, // chinese paired punctuation
|
|
0x300a, 0x300b,
|
|
0x300c, 0x300d,
|
|
0x300e, 0x300f,
|
|
0x3010, 0x3011,
|
|
0x3014, 0x3015,
|
|
0x3016, 0x3017,
|
|
0x3018, 0x3019,
|
|
0x301a, 0x301b
|
|
};
|
|
|
|
private static int pairedCharPower = 1 << highBit(pairedChars.length);
|
|
private static int pairedCharExtra = pairedChars.length - pairedCharPower;
|
|
}
|
|
|