555 lines
19 KiB
C++
555 lines
19 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 1999-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/17/99 aliu Creation.
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**********************************************************************
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_TRANSLITERATION
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#include "unicode/rep.h"
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#include "unicode/unifilt.h"
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#include "unicode/uniset.h"
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#include "rbt_rule.h"
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#include "rbt_data.h"
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#include "cmemory.h"
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#include "strmatch.h"
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#include "strrepl.h"
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#include "util.h"
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static const UChar FORWARD_OP[] = {32,62,32,0}; // " > "
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U_NAMESPACE_BEGIN
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/**
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* Construct a new rule with the given input, output text, and other
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* attributes. A cursor position may be specified for the output text.
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* @param input input string, including key and optional ante and
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* post context
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* @param anteContextPos offset into input to end of ante context, or -1 if
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* none. Must be <= input.length() if not -1.
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* @param postContextPos offset into input to start of post context, or -1
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* if none. Must be <= input.length() if not -1, and must be >=
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* anteContextPos.
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* @param output output string
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* @param cursorPosition offset into output at which cursor is located, or -1 if
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* none. If less than zero, then the cursor is placed after the
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* <code>output</code>; that is, -1 is equivalent to
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* <code>output.length()</code>. If greater than
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* <code>output.length()</code> then an exception is thrown.
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* @param segs array of UnicodeFunctors corresponding to input pattern
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* segments, or null if there are none. The array itself is adopted,
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* but the pointers within it are not.
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* @param segsCount number of elements in segs[]
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* @param anchorStart TRUE if the the rule is anchored on the left to
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* the context start
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* @param anchorEnd TRUE if the rule is anchored on the right to the
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* context limit
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*/
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TransliterationRule::TransliterationRule(const UnicodeString& input,
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int32_t anteContextPos, int32_t postContextPos,
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const UnicodeString& outputStr,
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int32_t cursorPosition, int32_t cursorOffset,
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UnicodeFunctor** segs,
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int32_t segsCount,
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UBool anchorStart, UBool anchorEnd,
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const TransliterationRuleData* theData,
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UErrorCode& status) :
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UMemory(),
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segments(0),
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data(theData) {
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if (U_FAILURE(status)) {
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return;
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}
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// Do range checks only when warranted to save time
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if (anteContextPos < 0) {
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anteContextLength = 0;
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} else {
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if (anteContextPos > input.length()) {
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// throw new IllegalArgumentException("Invalid ante context");
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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anteContextLength = anteContextPos;
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}
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if (postContextPos < 0) {
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keyLength = input.length() - anteContextLength;
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} else {
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if (postContextPos < anteContextLength ||
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postContextPos > input.length()) {
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// throw new IllegalArgumentException("Invalid post context");
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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keyLength = postContextPos - anteContextLength;
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}
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if (cursorPosition < 0) {
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cursorPosition = outputStr.length();
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} else if (cursorPosition > outputStr.length()) {
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// throw new IllegalArgumentException("Invalid cursor position");
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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// We don't validate the segments array. The caller must
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// guarantee that the segments are well-formed (that is, that
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// all $n references in the output refer to indices of this
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// array, and that no array elements are null).
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this->segments = segs;
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this->segmentsCount = segsCount;
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pattern = input;
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flags = 0;
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if (anchorStart) {
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flags |= ANCHOR_START;
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}
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if (anchorEnd) {
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flags |= ANCHOR_END;
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}
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anteContext = NULL;
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if (anteContextLength > 0) {
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anteContext = new StringMatcher(pattern, 0, anteContextLength,
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FALSE, *data);
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/* test for NULL */
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if (anteContext == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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key = NULL;
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if (keyLength > 0) {
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key = new StringMatcher(pattern, anteContextLength, anteContextLength + keyLength,
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FALSE, *data);
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/* test for NULL */
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if (key == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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int32_t postContextLength = pattern.length() - keyLength - anteContextLength;
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postContext = NULL;
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if (postContextLength > 0) {
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postContext = new StringMatcher(pattern, anteContextLength + keyLength, pattern.length(),
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FALSE, *data);
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/* test for NULL */
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if (postContext == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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this->output = new StringReplacer(outputStr, cursorPosition + cursorOffset, data);
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/* test for NULL */
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if (this->output == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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/**
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* Copy constructor.
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*/
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TransliterationRule::TransliterationRule(TransliterationRule& other) :
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UMemory(other),
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anteContext(NULL),
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key(NULL),
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postContext(NULL),
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pattern(other.pattern),
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anteContextLength(other.anteContextLength),
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keyLength(other.keyLength),
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flags(other.flags),
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data(other.data) {
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segments = NULL;
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segmentsCount = 0;
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if (other.segmentsCount > 0) {
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segments = (UnicodeFunctor **)uprv_malloc(other.segmentsCount * sizeof(UnicodeFunctor *));
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uprv_memcpy(segments, other.segments, other.segmentsCount*sizeof(segments[0]));
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}
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if (other.anteContext != NULL) {
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anteContext = (StringMatcher*) other.anteContext->clone();
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}
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if (other.key != NULL) {
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key = (StringMatcher*) other.key->clone();
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}
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if (other.postContext != NULL) {
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postContext = (StringMatcher*) other.postContext->clone();
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}
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output = other.output->clone();
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}
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TransliterationRule::~TransliterationRule() {
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uprv_free(segments);
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delete anteContext;
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delete key;
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delete postContext;
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delete output;
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}
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/**
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* Return the preceding context length. This method is needed to
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* support the <code>Transliterator</code> method
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* <code>getMaximumContextLength()</code>. Internally, this is
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* implemented as the anteContextLength, optionally plus one if
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* there is a start anchor. The one character anchor gap is
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* needed to make repeated incremental transliteration with
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* anchors work.
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*/
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int32_t TransliterationRule::getContextLength(void) const {
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return anteContextLength + ((flags & ANCHOR_START) ? 1 : 0);
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}
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/**
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* Internal method. Returns 8-bit index value for this rule.
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* This is the low byte of the first character of the key,
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* unless the first character of the key is a set. If it's a
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* set, or otherwise can match multiple keys, the index value is -1.
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*/
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int16_t TransliterationRule::getIndexValue() const {
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if (anteContextLength == pattern.length()) {
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// A pattern with just ante context {such as foo)>bar} can
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// match any key.
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return -1;
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}
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UChar32 c = pattern.char32At(anteContextLength);
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return (int16_t)(data->lookupMatcher(c) == NULL ? (c & 0xFF) : -1);
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}
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/**
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* Internal method. Returns true if this rule matches the given
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* index value. The index value is an 8-bit integer, 0..255,
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* representing the low byte of the first character of the key.
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* It matches this rule if it matches the first character of the
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* key, or if the first character of the key is a set, and the set
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* contains any character with a low byte equal to the index
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* value. If the rule contains only ante context, as in foo)>bar,
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* then it will match any key.
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*/
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UBool TransliterationRule::matchesIndexValue(uint8_t v) const {
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// Delegate to the key, or if there is none, to the postContext.
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// If there is neither then we match any key; return true.
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UnicodeMatcher *m = (key != NULL) ? key : postContext;
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return (m != NULL) ? m->matchesIndexValue(v) : TRUE;
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}
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/**
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* Return true if this rule masks another rule. If r1 masks r2 then
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* r1 matches any input string that r2 matches. If r1 masks r2 and r2 masks
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* r1 then r1 == r2. Examples: "a>x" masks "ab>y". "a>x" masks "a[b]>y".
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* "[c]a>x" masks "[dc]a>y".
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*/
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UBool TransliterationRule::masks(const TransliterationRule& r2) const {
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/* Rule r1 masks rule r2 if the string formed of the
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* antecontext, key, and postcontext overlaps in the following
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* way:
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*
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* r1: aakkkpppp
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* r2: aaakkkkkpppp
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* ^
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*
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* The strings must be aligned at the first character of the
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* key. The length of r1 to the left of the alignment point
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* must be <= the length of r2 to the left; ditto for the
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* right. The characters of r1 must equal (or be a superset
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* of) the corresponding characters of r2. The superset
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* operation should be performed to check for UnicodeSet
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* masking.
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*
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* Anchors: Two patterns that differ only in anchors only
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* mask one another if they are exactly equal, and r2 has
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* all the anchors r1 has (optionally, plus some). Here Y
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* means the row masks the column, N means it doesn't.
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*
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* ab ^ab ab$ ^ab$
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* ab Y Y Y Y
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* ^ab N Y N Y
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* ab$ N N Y Y
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* ^ab$ N N N Y
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*
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* Post context: {a}b masks ab, but not vice versa, since {a}b
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* matches everything ab matches, and {a}b matches {|a|}b but ab
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* does not. Pre context is different (a{b} does not align with
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* ab).
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*/
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/* LIMITATION of the current mask algorithm: Some rule
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* maskings are currently not detected. For example,
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* "{Lu}]a>x" masks "A]a>y". This can be added later. TODO
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*/
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int32_t len = pattern.length();
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int32_t left = anteContextLength;
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int32_t left2 = r2.anteContextLength;
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int32_t right = len - left;
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int32_t right2 = r2.pattern.length() - left2;
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// TODO Clean this up -- some logic might be combinable with the
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// next statement.
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// Test for anchor masking
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if (left == left2 && right == right2 &&
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keyLength <= r2.keyLength &&
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0 == r2.pattern.compare(0, len, pattern)) {
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// The following boolean logic implements the table above
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return (flags == r2.flags) ||
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(!(flags & ANCHOR_START) && !(flags & ANCHOR_END)) ||
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((r2.flags & ANCHOR_START) && (r2.flags & ANCHOR_END));
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}
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return left <= left2 &&
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(right < right2 ||
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(right == right2 && keyLength <= r2.keyLength)) &&
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0 == r2.pattern.compare(left2 - left, len, pattern);
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}
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static inline int32_t posBefore(const Replaceable& str, int32_t pos) {
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return (pos > 0) ?
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pos - UTF_CHAR_LENGTH(str.char32At(pos-1)) :
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pos - 1;
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}
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static inline int32_t posAfter(const Replaceable& str, int32_t pos) {
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return (pos >= 0 && pos < str.length()) ?
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pos + UTF_CHAR_LENGTH(str.char32At(pos)) :
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pos + 1;
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}
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/**
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* Attempt a match and replacement at the given position. Return
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* the degree of match between this rule and the given text. The
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* degree of match may be mismatch, a partial match, or a full
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* match. A mismatch means at least one character of the text
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* does not match the context or key. A partial match means some
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* context and key characters match, but the text is not long
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* enough to match all of them. A full match means all context
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* and key characters match.
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*
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* If a full match is obtained, perform a replacement, update pos,
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* and return U_MATCH. Otherwise both text and pos are unchanged.
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*
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* @param text the text
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* @param pos the position indices
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* @param incremental if TRUE, test for partial matches that may
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* be completed by additional text inserted at pos.limit.
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* @return one of <code>U_MISMATCH</code>,
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* <code>U_PARTIAL_MATCH</code>, or <code>U_MATCH</code>. If
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* incremental is FALSE then U_PARTIAL_MATCH will not be returned.
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*/
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UMatchDegree TransliterationRule::matchAndReplace(Replaceable& text,
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UTransPosition& pos,
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UBool incremental) const {
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// Matching and replacing are done in one method because the
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// replacement operation needs information obtained during the
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// match. Another way to do this is to have the match method
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// create a match result struct with relevant offsets, and to pass
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// this into the replace method.
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// ============================ MATCH ===========================
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// Reset segment match data
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if (segments != NULL) {
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for (int32_t i=0; i<segmentsCount; ++i) {
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((StringMatcher*) segments[i])->resetMatch();
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}
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}
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// int32_t lenDelta, keyLimit;
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int32_t keyLimit;
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// ------------------------ Ante Context ------------------------
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// A mismatch in the ante context, or with the start anchor,
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// is an outright U_MISMATCH regardless of whether we are
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// incremental or not.
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int32_t oText; // offset into 'text'
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// int32_t newStart = 0;
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int32_t minOText;
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// Note (1): We process text in 16-bit code units, rather than
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// 32-bit code points. This works because stand-ins are
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// always in the BMP and because we are doing a literal match
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// operation, which can be done 16-bits at a time.
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int32_t anteLimit = posBefore(text, pos.contextStart);
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UMatchDegree match;
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// Start reverse match at char before pos.start
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oText = posBefore(text, pos.start);
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if (anteContext != NULL) {
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match = anteContext->matches(text, oText, anteLimit, FALSE);
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if (match != U_MATCH) {
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return U_MISMATCH;
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}
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}
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minOText = posAfter(text, oText);
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// ------------------------ Start Anchor ------------------------
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if (((flags & ANCHOR_START) != 0) && oText != anteLimit) {
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return U_MISMATCH;
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}
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// -------------------- Key and Post Context --------------------
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oText = pos.start;
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if (key != NULL) {
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match = key->matches(text, oText, pos.limit, incremental);
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if (match != U_MATCH) {
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return match;
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}
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}
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keyLimit = oText;
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if (postContext != NULL) {
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if (incremental && keyLimit == pos.limit) {
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// The key matches just before pos.limit, and there is
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// a postContext. Since we are in incremental mode,
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// we must assume more characters may be inserted at
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// pos.limit -- this is a partial match.
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return U_PARTIAL_MATCH;
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}
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match = postContext->matches(text, oText, pos.contextLimit, incremental);
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if (match != U_MATCH) {
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return match;
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}
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}
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// ------------------------- Stop Anchor ------------------------
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if (((flags & ANCHOR_END)) != 0) {
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if (oText != pos.contextLimit) {
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return U_MISMATCH;
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}
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if (incremental) {
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return U_PARTIAL_MATCH;
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}
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}
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// =========================== REPLACE ==========================
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// We have a full match. The key is between pos.start and
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// keyLimit.
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int32_t newStart;
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int32_t newLength = output->toReplacer()->replace(text, pos.start, keyLimit, newStart);
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int32_t lenDelta = newLength - (keyLimit - pos.start);
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oText += lenDelta;
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pos.limit += lenDelta;
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pos.contextLimit += lenDelta;
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// Restrict new value of start to [minOText, min(oText, pos.limit)].
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pos.start = uprv_max(minOText, uprv_min(uprv_min(oText, pos.limit), newStart));
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return U_MATCH;
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}
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/**
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* Create a source string that represents this rule. Append it to the
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* given string.
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*/
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UnicodeString& TransliterationRule::toRule(UnicodeString& rule,
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UBool escapeUnprintable) const {
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// Accumulate special characters (and non-specials following them)
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// into quoteBuf. Append quoteBuf, within single quotes, when
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// a non-quoted element must be inserted.
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UnicodeString str, quoteBuf;
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// Do not emit the braces '{' '}' around the pattern if there
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// is neither anteContext nor postContext.
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UBool emitBraces =
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(anteContext != NULL) || (postContext != NULL);
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// Emit start anchor
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if ((flags & ANCHOR_START) != 0) {
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rule.append((UChar)94/*^*/);
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}
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// Emit the input pattern
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ICU_Utility::appendToRule(rule, anteContext, escapeUnprintable, quoteBuf);
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if (emitBraces) {
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ICU_Utility::appendToRule(rule, (UChar) 0x007B /*{*/, TRUE, escapeUnprintable, quoteBuf);
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}
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ICU_Utility::appendToRule(rule, key, escapeUnprintable, quoteBuf);
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if (emitBraces) {
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ICU_Utility::appendToRule(rule, (UChar) 0x007D /*}*/, TRUE, escapeUnprintable, quoteBuf);
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}
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ICU_Utility::appendToRule(rule, postContext, escapeUnprintable, quoteBuf);
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// Emit end anchor
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if ((flags & ANCHOR_END) != 0) {
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rule.append((UChar)36/*$*/);
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}
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ICU_Utility::appendToRule(rule, FORWARD_OP, TRUE, escapeUnprintable, quoteBuf);
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// Emit the output pattern
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ICU_Utility::appendToRule(rule, output->toReplacer()->toReplacerPattern(str, escapeUnprintable),
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TRUE, escapeUnprintable, quoteBuf);
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ICU_Utility::appendToRule(rule, (UChar) 0x003B /*;*/, TRUE, escapeUnprintable, quoteBuf);
|
|
|
|
return rule;
|
|
}
|
|
|
|
void TransliterationRule::setData(const TransliterationRuleData* d) {
|
|
data = d;
|
|
if (anteContext != NULL) anteContext->setData(d);
|
|
if (postContext != NULL) postContext->setData(d);
|
|
if (key != NULL) key->setData(d);
|
|
// assert(output != NULL);
|
|
output->setData(d);
|
|
// Don't have to do segments since they are in the context or key
|
|
}
|
|
|
|
/**
|
|
* Union the set of all characters that may be modified by this rule
|
|
* into the given set.
|
|
*/
|
|
void TransliterationRule::addSourceSetTo(UnicodeSet& toUnionTo) const {
|
|
int32_t limit = anteContextLength + keyLength;
|
|
for (int32_t i=anteContextLength; i<limit; ) {
|
|
UChar32 ch = pattern.char32At(i);
|
|
i += UTF_CHAR_LENGTH(ch);
|
|
const UnicodeMatcher* matcher = data->lookupMatcher(ch);
|
|
if (matcher == NULL) {
|
|
toUnionTo.add(ch);
|
|
} else {
|
|
matcher->addMatchSetTo(toUnionTo);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Union the set of all characters that may be emitted by this rule
|
|
* into the given set.
|
|
*/
|
|
void TransliterationRule::addTargetSetTo(UnicodeSet& toUnionTo) const {
|
|
output->toReplacer()->addReplacementSetTo(toUnionTo);
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_TRANSLITERATION */
|
|
|
|
//eof
|