140 lines
5.4 KiB
C
140 lines
5.4 KiB
C
// © 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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* Copyright (C) 1999-2011, 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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* File USC_IMPL.H
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*
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* Modification History:
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*
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* Date Name Description
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* 07/08/2002 Eric Mader Creation.
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******************************************************************************
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*/
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#ifndef USC_IMPL_H
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#define USC_IMPL_H
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#include "unicode/utypes.h"
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#include "unicode/uscript.h"
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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. It implements a simple iterator over an array
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* of characters. The iterator will resolve script-neutral characters
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* like punctuation into the script of the surrounding 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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* Scripts are chosen based on the <code>UScriptCode</code> enumeration.
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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 seperate
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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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* \code
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* void printScriptRuns(const UChar *text, int32_t length)
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* {
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* UErrorCode error = U_ZERO_ERROR;
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* UScriptRun *scriptRun = uscript_openRun(text, testLength, &error);
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* int32_t start = 0, limit = 0;
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* UScriptCode code = USCRIPT_INVALID_CODE;
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*
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* while (uscript_nextRun(&start, &limit, &code)) {
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* printf("Script '%s' from %d to %d.\n", uscript_getName(code), start, limit);
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* }
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*
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* uscript_closeRun(scriptRun);
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* }
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* </pre>
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*/
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struct UScriptRun;
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typedef struct UScriptRun UScriptRun;
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/**
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* Create a <code>UScriptRun</code> object for iterating over the given text. This object must
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* be freed using <code>uscript_closeRun()</code>. Note that this object does not copy the source text,
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* only the pointer to it. You must make sure that the pointer remains valid until you call
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* <code>uscript_closeRun()</code> or <code>uscript_setRunText()</code>.
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*
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* @param src is the address of the array of characters over which to iterate.
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* if <code>src == NULL</code> and <code>length == 0</code>,
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* an empty <code>UScriptRun</code> object will be returned.
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*
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* @param length is the number of characters over which to iterate.
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*
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* @param pErrorCode is a pointer to a valid <code>UErrorCode</code> value. If this value
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* indicates a failure on entry, the function will immediately return.
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* On exit the value will indicate the success of the operation.
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*
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* @return the address of <code>UScriptRun</code> object which will iterate over the text,
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* or <code>NULL</code> if the operation failed.
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*/
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U_CAPI UScriptRun * U_EXPORT2
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uscript_openRun(const UChar *src, int32_t length, UErrorCode *pErrorCode);
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/**
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* Frees the given <code>UScriptRun</code> object and any storage associated with it.
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* On return, scriptRun no longer points to a valid <code>UScriptRun</code> object.
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*
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* @param scriptRun is the <code>UScriptRun</code> object which will be freed.
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*/
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U_CAPI void U_EXPORT2
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uscript_closeRun(UScriptRun *scriptRun);
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/**
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* Reset the <code>UScriptRun</code> object so that it will start iterating from
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* the beginning.
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*
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* @param scriptRun is the address of the <code>UScriptRun</code> object to be reset.
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*/
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U_CAPI void U_EXPORT2
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uscript_resetRun(UScriptRun *scriptRun);
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/**
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* Change the text over which the given <code>UScriptRun</code> object iterates.
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*
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* @param scriptRun is the <code>UScriptRun</code> object which will be changed.
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*
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* @param src is the address of the new array of characters over which to iterate.
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* If <code>src == NULL</code> and <code>length == 0</code>,
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* the <code>UScriptRun</code> object will become empty.
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*
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* @param length is the new number of characters over which to iterate
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*
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* @param pErrorCode is a pointer to a valid <code>UErrorCode</code> value. If this value
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* indicates a failure on entry, the function will immediately return.
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* On exit the value will indicate the success of the operation.
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*/
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U_CAPI void U_EXPORT2
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uscript_setRunText(UScriptRun *scriptRun, const UChar *src, int32_t length, UErrorCode *pErrorCode);
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/**
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* Advance the <code>UScriptRun</code> object to the next script run, return the start and limit
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* offsets, and the script of the run.
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*
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* @param scriptRun is the address of the <code>UScriptRun</code> object.
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*
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* @param pRunStart is a pointer to the variable to receive the starting offset of the next run.
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* This pointer can be <code>NULL</code> if the value is not needed.
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*
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* @param pRunLimit is a pointer to the variable to receive the limit offset of the next run.
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* This pointer can be <code>NULL</code> if the value is not needed.
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*
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* @param pRunScript is a pointer to the variable to receive the UScriptCode for the
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* script of the current run. This pointer can be <code>NULL</code> if the value is not needed.
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*
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* @return true if there was another script run.
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*/
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U_CAPI UBool U_EXPORT2
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uscript_nextRun(UScriptRun *scriptRun, int32_t *pRunStart, int32_t *pRunLimit, UScriptCode *pRunScript);
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#endif
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