817 lines
30 KiB
C++
817 lines
30 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 "rbt_rule.h"
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#include "unicode/rep.h"
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#include "rbt_data.h"
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#include "unicode/unifilt.h"
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#include "unicode/uniset.h"
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#include "unicode/unicode.h"
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#include "cmemory.h"
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const UChar TransliterationRule::ETHER = 0xFFFF;
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static const UChar APOSTROPHE = 0x0027; // '\''
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static const UChar BACKSLASH = 0x005C; // '\'
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// To process segments we need to allocate arrays of integers. We use
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// stack storage as long as the segment count is <= MAX_STATIC_SEGS.
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// Otherwise, we allocate heap space.
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#define MAX_STATIC_SEGS 20
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// Macros for accessing the array of integers encoding the position of
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// the segments. See rbt_pars.cpp::Segments for more details.
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// SEGMENTS_COUNT number of segments, n (half the number of parens)
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// SEGMENTS_LEN length of the segments array (number of elements)
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// SEGMENTS_POS position of parenthesis i, where i=0..2n-1
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// SEGMENTS_NUM index into segments to access POS of $1.open,
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// $1.close, $2.open, $2.close,.., $n.open, $n.close
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#define FIRST_SEG_POS_INDEX 2
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#define SEGMENTS_COUNT(x) x[0]
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#define SEGMENTS_LEN(x) (SEGMENTS_COUNT(x)*4+4)
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#define SEGMENTS_POS(x,i) x[FIRST_SEG_POS_INDEX+i]
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#define SEGMENTS_NUM(x,i) x[x[1]+i]
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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 adoptedSegs array of 2n integers. Each of n pairs consists of offset,
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* limit for a segment of the input string. Characters in the output string
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* refer to these segments if they are in a special range determined by the
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* associated RuleBasedTransliterator.Data object. May be null if there are
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* no segments.
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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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int32_t* adoptedSegs,
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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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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 {
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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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}
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this->cursorPos = cursorPosition + cursorOffset;
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this->output = outputStr;
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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.
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this->segments = adoptedSegs;
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// Find the position of the first segment index that is after the
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// anteContext (in the key). Note that this may be a start or a
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// limit index. If all segments are in the ante context,
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// firstKeySeg should point past the last segment -- that is, it
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// should point at the end marker, which is -1. This allows the
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// code to back up by one to obtain the last ante context segment.
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firstKeySeg = -1;
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if (segments != 0) {
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firstKeySeg = FIRST_SEG_POS_INDEX;
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while (segments[firstKeySeg] >= 0 &&
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segments[firstKeySeg] < anteContextLength) {
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++firstKeySeg;
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}
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}
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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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}
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/**
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* Copy constructor.
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*/
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/* Ram: Reordered member initializers to match declaration order and make GCC happy */
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TransliterationRule::TransliterationRule(TransliterationRule& other) :
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pattern(other.pattern),
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output(other.output),
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firstKeySeg(other.firstKeySeg),
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anteContextLength(other.anteContextLength),
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keyLength(other.keyLength),
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cursorPos(other.cursorPos),
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flags(other.flags),
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data(other.data) {
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segments = 0;
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if (other.segments != 0) {
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int32_t len = SEGMENTS_LEN(other.segments);
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segments = new int32_t[len];
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uprv_memcpy(segments, other.segments, len*sizeof(segments[0]));
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}
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}
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TransliterationRule::~TransliterationRule() {
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delete[] segments;
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}
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/**
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* Return the position of the cursor within the output string.
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* @return a value from 0 to <code>getOutput().length()</code>, inclusive.
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*/
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int32_t TransliterationRule::getCursorPos(void) const {
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return cursorPos;
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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->lookup(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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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 TRUE;
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}
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UChar32 c = pattern.char32At(anteContextLength);
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const UnicodeMatcher* matcher = data->lookup(c);
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return matcher == NULL ? (uint8_t(c) == v) :
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matcher->matchesIndexValue(v);
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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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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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inline int32_t posAfter(const Replaceable& str, int32_t pos) {
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return (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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// Record the actual positions, in the text, of the segments.
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// These are recorded in the order that they occur in the pattern.
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int32_t _segPos[2*MAX_STATIC_SEGS];
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int32_t *segPos = _segPos;
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if (segments != 0 && SEGMENTS_COUNT(segments) > MAX_STATIC_SEGS) {
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segPos = new int32_t[2*SEGMENTS_COUNT(segments)];
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}
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int32_t iSeg = firstKeySeg - 1;
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int32_t nextSegPos = (iSeg >= 0) ? segments[iSeg] : -1;
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UMatchDegree m;
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int32_t lenDelta, 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 cursor;
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int32_t newStart = 0;
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int32_t minCursor;
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int32_t i;
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// Backup cursor by one
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cursor = posBefore(text, pos.start);
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for (i=anteContextLength-1; i>=0; --i) {
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UChar keyChar = pattern.charAt(i);
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const UnicodeMatcher* matcher = data->lookup(keyChar);
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if (matcher == 0) {
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if (cursor >= pos.contextStart &&
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keyChar == text.charAt(cursor)) {
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--cursor;
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} else {
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m = U_MISMATCH;
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goto exit;
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}
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} else {
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// Subtract 1 from contextStart to make it a reverse limit
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if (matcher->matches(text, cursor, pos.contextStart-1, FALSE)
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!= U_MATCH) {
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m = U_MISMATCH;
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goto exit;
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}
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}
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while (nextSegPos == i) {
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segPos[iSeg] = cursor;
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if (cursor >= 0) {
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segPos[iSeg] += UTF_CHAR_LENGTH(text.char32At(cursor));
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} else {
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++segPos[iSeg];
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}
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nextSegPos = (--iSeg >= FIRST_SEG_POS_INDEX) ? segments[iSeg] : -1;
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}
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}
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minCursor = posAfter(text, cursor);
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// ------------------------ Start Anchor ------------------------
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if ((flags & ANCHOR_START) && cursor != posBefore(text, pos.contextStart)) {
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m = U_MISMATCH;
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goto exit;
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}
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// -------------------- Key and Post Context --------------------
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iSeg = firstKeySeg;
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nextSegPos = (iSeg >= FIRST_SEG_POS_INDEX) ? (segments[iSeg] - anteContextLength) : -1;
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i = 0;
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cursor = pos.start;
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keyLimit = 0;
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while (i < (pattern.length() - anteContextLength)) {
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if (incremental && cursor == pos.contextLimit) {
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// We've reached the context limit without a mismatch and
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// without completing our match.
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m = U_PARTIAL_MATCH;
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goto exit;
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}
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if (cursor == pos.limit && i < keyLength) {
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// We're still in the pattern key but we're entering the
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// post context.
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m = U_MISMATCH;
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goto exit;
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}
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while (i == nextSegPos) {
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segPos[iSeg] = cursor;
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nextSegPos = segments[++iSeg] - anteContextLength;
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}
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if (i == keyLength) {
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keyLimit = cursor;
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}
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UChar keyChar = pattern.charAt(anteContextLength + i++);
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const UnicodeMatcher* matcher = data->lookup(keyChar);
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if (matcher == 0) {
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// Don't need the cursor < pos.contextLimit check if
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// incremental is TRUE (because it's done above); do need
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// it otherwise.
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if (cursor < pos.contextLimit &&
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keyChar == text.charAt(cursor)) {
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++cursor;
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} else {
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m = U_MISMATCH;
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goto exit;
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}
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} else {
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m = matcher->matches(text, cursor, pos.contextLimit, incremental);
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if (m != U_MATCH) {
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goto exit;
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}
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}
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}
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while (i == nextSegPos) {
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segPos[iSeg] = cursor;
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nextSegPos = segments[++iSeg] - anteContextLength;
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}
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if (i == keyLength) {
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keyLimit = cursor;
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}
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// ------------------------- Stop Anchor ------------------------
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if ((flags & ANCHOR_END) != 0) {
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if (cursor != 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. Segment indices have been recorded in segPos[].
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// Perform a replacement.
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if (segments == NULL) {
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text.handleReplaceBetween(pos.start, keyLimit, output);
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lenDelta = output.length() - (keyLimit - pos.start);
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if (cursorPos >= 0 && cursorPos < keyLength) {
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// Within the key, the cursor refers to 16-bit code units
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newStart = pos.start + cursorPos;
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} else {
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newStart = pos.start;
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int32_t n = cursorPos;
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// Outside the key, cursorPos counts code points
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while (n > 0) {
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|
newStart += UTF_CHAR_LENGTH(text.char32At(newStart));
|
|
--n;
|
|
}
|
|
while (n < 0) {
|
|
newStart -= UTF_CHAR_LENGTH(text.char32At(newStart-1));
|
|
++n;
|
|
}
|
|
}
|
|
} else {
|
|
/* When there are segments to be copied, use the Replaceable.copy()
|
|
* API in order to retain out-of-band data. Copy everything to the
|
|
* point after the key, then delete the key. That is, copy things
|
|
* into offset + keyLength, then replace offset .. offset +
|
|
* keyLength with the empty string.
|
|
*
|
|
* Minimize the number of calls to Replaceable.replace() and
|
|
* Replaceable.copy().
|
|
*/
|
|
int32_t dest = keyLimit; // copy new text to here
|
|
UnicodeString buf;
|
|
for (i=0; i<output.length(); ) {
|
|
if (i == cursorPos) {
|
|
// Record the position of the cursor
|
|
newStart = dest - (keyLimit - pos.start);
|
|
}
|
|
UChar32 c = output.char32At(i);
|
|
int32_t b = data->lookupSegmentReference(c);
|
|
if (b < 0) {
|
|
// Accumulate straight (non-segment) text.
|
|
buf.append(c);
|
|
} else {
|
|
// Insert any accumulated straight text.
|
|
if (buf.length() > 0) {
|
|
text.handleReplaceBetween(dest, dest, buf);
|
|
dest += buf.length();
|
|
buf.remove();
|
|
}
|
|
// Copy segment with out-of-band data
|
|
b *= 2;
|
|
int32_t start = segPos[SEGMENTS_NUM(segments,b)];
|
|
int32_t limit = segPos[SEGMENTS_NUM(segments,b+1)];
|
|
text.copy(start, limit, dest);
|
|
dest += limit - start;
|
|
}
|
|
i += UTF_CHAR_LENGTH(c);
|
|
}
|
|
// Insert any accumulated straight text.
|
|
if (buf.length() > 0) {
|
|
text.handleReplaceBetween(dest, dest, buf);
|
|
dest += buf.length();
|
|
}
|
|
if (i == cursorPos) {
|
|
// Record the position of the cursor
|
|
newStart = dest - (keyLimit - pos.start);
|
|
}
|
|
// Delete the key
|
|
buf.remove();
|
|
text.handleReplaceBetween(pos.start, keyLimit, buf);
|
|
lenDelta = dest - keyLimit - (keyLimit - pos.start);
|
|
// Handle cursor in postContext
|
|
if (cursorPos > output.length()) {
|
|
newStart = pos.start + (dest - keyLimit);
|
|
int32_t n = cursorPos - output.length();
|
|
// cursorPos counts code points
|
|
while (n > 0) {
|
|
newStart += UTF_CHAR_LENGTH(text.char32At(newStart));
|
|
n--;
|
|
}
|
|
}
|
|
}
|
|
|
|
cursor += lenDelta;
|
|
pos.limit += lenDelta;
|
|
pos.contextLimit += lenDelta;
|
|
// Restrict new value of start to [minCursor, min(cursor, pos.limit)].
|
|
pos.start = uprv_max(minCursor, uprv_min(uprv_min(cursor, pos.limit), newStart));
|
|
m = U_MATCH;
|
|
|
|
exit:
|
|
if (segPos != _segPos) {
|
|
delete[] segPos;
|
|
}
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* Append a character to a rule that is being built up. To flush
|
|
* the quoteBuf to rule, make one final call with isLiteral == TRUE.
|
|
* If there is no final character, pass in (UChar32)-1 as c.
|
|
* @param rule the string to append the character to
|
|
* @param c the character to append, or (UChar32)-1 if none.
|
|
* @param isLiteral if true, then the given character should not be
|
|
* quoted or escaped. Usually this means it is a syntactic element
|
|
* such as > or $
|
|
* @param escapeUnprintable if true, then unprintable characters
|
|
* should be escaped using \uxxxx or \Uxxxxxxxx. These escapes will
|
|
* appear outside of quotes.
|
|
* @param quoteBuf a buffer which is used to build up quoted
|
|
* substrings. The caller should initially supply an empty buffer,
|
|
* and thereafter should not modify the buffer. The buffer should be
|
|
* cleared out by, at the end, calling this method with a literal
|
|
* character.
|
|
*/
|
|
void TransliterationRule::appendToRule(UnicodeString& rule,
|
|
UChar32 c,
|
|
UBool isLiteral,
|
|
UBool escapeUnprintable,
|
|
UnicodeString& quoteBuf) {
|
|
// If we are escaping unprintables, then escape them outside
|
|
// quotes. \u and \U are not recognized within quotes. The same
|
|
// logic applies to literals, but literals are never escaped.
|
|
if (isLiteral ||
|
|
(escapeUnprintable && UnicodeSet::_isUnprintable(c))) {
|
|
if (quoteBuf.length() > 0) {
|
|
// We prefer backslash APOSTROPHE to double APOSTROPHE
|
|
// (more readable, less similar to ") so if there are
|
|
// double APOSTROPHEs at the ends, we pull them outside
|
|
// of the quote.
|
|
|
|
// If the first thing in the quoteBuf is APOSTROPHE
|
|
// (doubled) then pull it out.
|
|
while (quoteBuf.length() >= 2 &&
|
|
quoteBuf.charAt(0) == APOSTROPHE &&
|
|
quoteBuf.charAt(1) == APOSTROPHE) {
|
|
rule.append(BACKSLASH).append(APOSTROPHE);
|
|
quoteBuf.remove(0, 2);
|
|
}
|
|
// If the last thing in the quoteBuf is APOSTROPHE
|
|
// (doubled) then remove and count it and add it after.
|
|
int32_t trailingCount = 0;
|
|
while (quoteBuf.length() >= 2 &&
|
|
quoteBuf.charAt(quoteBuf.length()-2) == APOSTROPHE &&
|
|
quoteBuf.charAt(quoteBuf.length()-1) == APOSTROPHE) {
|
|
quoteBuf.truncate(quoteBuf.length()-2);
|
|
++trailingCount;
|
|
}
|
|
if (quoteBuf.length() > 0) {
|
|
rule.append(APOSTROPHE);
|
|
rule.append(quoteBuf);
|
|
rule.append(APOSTROPHE);
|
|
quoteBuf.truncate(0);
|
|
}
|
|
while (trailingCount-- > 0) {
|
|
rule.append(BACKSLASH).append(APOSTROPHE);
|
|
}
|
|
}
|
|
if (c != (UChar32)-1) {
|
|
if (!escapeUnprintable || !UnicodeSet::_escapeUnprintable(rule, c)) {
|
|
rule.append(c);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Escape ' and '\' and don't begin a quote just for them
|
|
else if (quoteBuf.length() == 0 &&
|
|
(c == APOSTROPHE || c == BACKSLASH)) {
|
|
rule.append(BACKSLASH);
|
|
rule.append(c);
|
|
}
|
|
|
|
// Specials (printable ascii that isn't [0-9a-zA-Z]) and
|
|
// whitespace need quoting. Also append stuff to quotes if we are
|
|
// building up a quoted substring already.
|
|
else if (quoteBuf.length() > 0 ||
|
|
(c >= 0x0021 && c <= 0x007E &&
|
|
!((c >= 0x0030/*'0'*/ && c <= 0x0039/*'9'*/) ||
|
|
(c >= 0x0041/*'A'*/ && c <= 0x005A/*'Z'*/) ||
|
|
(c >= 0x0061/*'a'*/ && c <= 0x007A/*'z'*/))) ||
|
|
Unicode::isWhitespace(c)) {
|
|
quoteBuf.append(c);
|
|
// Double ' within a quote
|
|
if (c == APOSTROPHE) {
|
|
quoteBuf.append(c);
|
|
}
|
|
}
|
|
|
|
// Otherwise just append
|
|
else {
|
|
rule.append(c);
|
|
}
|
|
}
|
|
|
|
void TransliterationRule::appendToRule(UnicodeString& rule,
|
|
const UnicodeString& text,
|
|
UBool isLiteral,
|
|
UBool escapeUnprintable,
|
|
UnicodeString& quoteBuf) {
|
|
for (int32_t i=0; i<text.length(); ++i) {
|
|
appendToRule(rule, text[i], isLiteral, escapeUnprintable, quoteBuf);
|
|
}
|
|
}
|
|
|
|
static const int32_t POW10[] = {1, 10, 100, 1000, 10000, 100000, 1000000,
|
|
10000000, 100000000, 1000000000};
|
|
|
|
/**
|
|
* Create a source string that represents this rule. Append it to the
|
|
* given string.
|
|
*/
|
|
UnicodeString& TransliterationRule::toRule(UnicodeString& rule,
|
|
UBool escapeUnprintable) const {
|
|
int32_t i;
|
|
|
|
int32_t iseg = FIRST_SEG_POS_INDEX-1;
|
|
int32_t nextSeg = -1;
|
|
// Build an array of booleans specifying open vs. close paren
|
|
UBool _isOpen[2*MAX_STATIC_SEGS];
|
|
UBool *isOpen = _isOpen;
|
|
if (segments != 0) {
|
|
if (SEGMENTS_COUNT(segments) > MAX_STATIC_SEGS) {
|
|
isOpen = new UBool[2*SEGMENTS_COUNT(segments)];
|
|
}
|
|
for (i=0; i<2*SEGMENTS_COUNT(segments); i+=2) {
|
|
isOpen[SEGMENTS_NUM(segments,i) -FIRST_SEG_POS_INDEX] = TRUE;
|
|
isOpen[SEGMENTS_NUM(segments,i+1)-FIRST_SEG_POS_INDEX] = FALSE;
|
|
}
|
|
nextSeg = segments[++iseg];
|
|
}
|
|
|
|
// Accumulate special characters (and non-specials following them)
|
|
// into quoteBuf. Append quoteBuf, within single quotes, when
|
|
// a non-quoted element must be inserted.
|
|
UnicodeString str, quoteBuf;
|
|
|
|
// Do not emit the braces '{' '}' around the pattern if there
|
|
// is neither anteContext nor postContext.
|
|
UBool emitBraces =
|
|
(anteContextLength != 0) || (keyLength != pattern.length());
|
|
|
|
// Emit the input pattern
|
|
for (i=0; i<pattern.length(); ++i) {
|
|
if (emitBraces && i == anteContextLength) {
|
|
appendToRule(rule, (UChar) 0x007B /*{*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
|
|
// Append either '(' or ')' if we are at a segment index
|
|
if (i == nextSeg) {
|
|
appendToRule(rule, isOpen[iseg-FIRST_SEG_POS_INDEX] ?
|
|
(UChar)0x0028 : (UChar)0x0029,
|
|
TRUE, escapeUnprintable, quoteBuf);
|
|
nextSeg = segments[++iseg];
|
|
}
|
|
|
|
if (emitBraces && i == (anteContextLength + keyLength)) {
|
|
appendToRule(rule, (UChar) 0x007D /*}*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
|
|
UChar c = pattern.charAt(i);
|
|
const UnicodeMatcher *matcher = data->lookup(c);
|
|
if (matcher == 0) {
|
|
appendToRule(rule, c, FALSE, escapeUnprintable, quoteBuf);
|
|
} else {
|
|
appendToRule(rule, matcher->toPattern(str, escapeUnprintable),
|
|
TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
}
|
|
|
|
if (i == nextSeg) {
|
|
// assert(!isOpen[iSeg-FIRST_SEG_POS_INDEX]);
|
|
appendToRule(rule, (UChar)0x0029 /*)*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
|
|
if (emitBraces && i == (anteContextLength + keyLength)) {
|
|
appendToRule(rule, (UChar)0x007D /*}*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
|
|
appendToRule(rule, UnicodeString(" > ", ""), TRUE, escapeUnprintable, quoteBuf);
|
|
|
|
// Emit the output pattern
|
|
|
|
// Handle a cursor preceding the output
|
|
int32_t cursor = cursorPos;
|
|
if (cursor < 0) {
|
|
while (cursor++ < 0) {
|
|
appendToRule(rule, (UChar) 0x0040 /*@*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
// Fall through and append '|' below
|
|
}
|
|
|
|
for (i=0; i<output.length(); ++i) {
|
|
if (i == cursor) {
|
|
appendToRule(rule, (UChar) 0x007C /*|*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
UChar c = output.charAt(i);
|
|
int32_t seg = data->lookupSegmentReference(c);
|
|
if (seg < 0) {
|
|
appendToRule(rule, c, FALSE, escapeUnprintable, quoteBuf);
|
|
} else {
|
|
++seg; // make 1-based
|
|
appendToRule(rule, (UChar)0x20, TRUE, escapeUnprintable, quoteBuf);
|
|
rule.append((UChar)0x24 /*$*/);
|
|
UBool show = FALSE; // TRUE if we should display digits
|
|
for (int32_t p=9; p>=0; --p) {
|
|
int32_t d = seg / POW10[p];
|
|
seg -= d * POW10[p];
|
|
if (d != 0 || p == 0) {
|
|
show = TRUE;
|
|
}
|
|
if (show) {
|
|
rule.append((UChar)(48+d));
|
|
}
|
|
}
|
|
rule.append((UChar)0x20);
|
|
}
|
|
}
|
|
|
|
// Handle a cursor after the output. Use > rather than >= because
|
|
// if cursor == output.length() it is at the end of the output,
|
|
// which is the default position, so we need not emit it.
|
|
if (cursor > output.length()) {
|
|
cursor -= output.length();
|
|
while (cursor-- > 0) {
|
|
appendToRule(rule, (UChar) 0x0040 /*@*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
appendToRule(rule, (UChar) 0x007C /*|*/, TRUE, escapeUnprintable, quoteBuf);
|
|
}
|
|
|
|
appendToRule(rule, (UChar) 0x003B /*;*/, TRUE, escapeUnprintable, quoteBuf);
|
|
|
|
if (isOpen != _isOpen) {
|
|
delete[] isOpen;
|
|
}
|
|
return rule;
|
|
}
|
|
|
|
//eof
|