263 lines
8.7 KiB
C++
263 lines
8.7 KiB
C++
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/*
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**********************************************************************
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* Copyright (c) 2002, International Business Machines Corporation
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* and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 01/21/2002 aliu Creation.
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**********************************************************************
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*/
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#include "strrepl.h"
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#include "rbt_data.h"
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#include "util.h"
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U_NAMESPACE_BEGIN
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const UChar EMPTY[] = { 0 }; // empty string: ""
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/**
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* Construct a StringReplacer that sets the emits the given output
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* text and sets the cursor to the given position.
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* @param theOutput text that will replace input text when the
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* replace() method is called. May contain stand-in characters
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* that represent nested replacers.
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* @param theCursorPos cursor position that will be returned by
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* the replace() method
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* @param theData transliterator context object that translates
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* stand-in characters to UnicodeReplacer objects
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*/
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StringReplacer::StringReplacer(const UnicodeString& theOutput,
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int32_t theCursorPos,
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const TransliterationRuleData* theData) {
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output = theOutput;
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cursorPos = theCursorPos;
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hasCursor = TRUE;
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data = theData;
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isComplex = TRUE;
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}
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/**
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* Construct a StringReplacer that sets the emits the given output
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* text and does not modify the cursor.
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* @param theOutput text that will replace input text when the
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* replace() method is called. May contain stand-in characters
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* that represent nested replacers.
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* @param theData transliterator context object that translates
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* stand-in characters to UnicodeReplacer objects
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*/
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StringReplacer::StringReplacer(const UnicodeString& theOutput,
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const TransliterationRuleData* theData) {
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output = theOutput;
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cursorPos = 0;
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hasCursor = FALSE;
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data = theData;
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isComplex = TRUE;
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}
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/**
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* Copy constructor.
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*/
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StringReplacer::StringReplacer(const StringReplacer& other) {
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output = other.output;
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cursorPos = other.cursorPos;
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hasCursor = other.hasCursor;
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data = other.data;
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isComplex = other.isComplex;
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}
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/**
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* Destructor
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*/
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StringReplacer::~StringReplacer() {
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}
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/**
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* Implement UnicodeFunctor
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*/
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UnicodeFunctor* StringReplacer::clone() const {
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return new StringReplacer(*this);
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}
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/**
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* Implement UnicodeFunctor
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*/
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UnicodeReplacer* StringReplacer::toReplacer() const {
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return (UnicodeReplacer*) this;
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}
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/**
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* UnicodeReplacer API
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*/
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int32_t StringReplacer::replace(Replaceable& text,
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int32_t start,
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int32_t limit,
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int32_t& cursor) {
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int32_t outLen;
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int32_t newStart = 0;
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// NOTE: It should be possible to _always_ run the complex
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// processing code; just slower. If not, then there is a bug
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// in the complex processing code.
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// Simple (no nested replacers) Processing Code :
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if (!isComplex) {
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text.handleReplaceBetween(start, limit, output);
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outLen = output.length();
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// Setup default cursor position (for cursorPos within output)
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newStart = cursorPos;
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}
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// Complex (nested replacers) Processing Code :
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else {
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/* When there are segments to be copied, use the Replaceable.copy()
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* API in order to retain out-of-band data. Copy everything to the
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* end of the string, then copy them back over the key. This preserves
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* the integrity of indices into the key and surrounding context while
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* generating the output text.
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*/
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int32_t destStart = text.length(); // copy new text to here
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int32_t destLimit = destStart;
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UnicodeString buf;
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int32_t oOutput; // offset into 'output'
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isComplex = FALSE;
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for (oOutput=0; oOutput<output.length(); ) {
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if (oOutput == cursorPos) {
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// Record the position of the cursor
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newStart = destLimit - destStart; // relative to start
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}
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UChar32 c = output.char32At(oOutput);
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UnicodeReplacer* r = data->lookupReplacer(c);
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if (r == NULL) {
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// Accumulate straight (non-segment) text.
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buf.append(c);
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} else {
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isComplex = TRUE;
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// Insert any accumulated straight text.
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if (buf.length() > 0) {
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text.handleReplaceBetween(destLimit, destLimit, buf);
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destLimit += buf.length();
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buf.truncate(0);
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}
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// Delegate output generation to replacer object
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int32_t len = r->replace(text, destLimit, destLimit, cursor);
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destLimit += len;
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}
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oOutput += UTF_CHAR_LENGTH(c);
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}
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// Insert any accumulated straight text.
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if (buf.length() > 0) {
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text.handleReplaceBetween(destLimit, destLimit, buf);
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destLimit += buf.length();
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}
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if (oOutput == cursorPos) {
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// Record the position of the cursor
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newStart = destLimit - destStart; // relative to start
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}
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outLen = destLimit - destStart;
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// Copy new text to start, and delete it
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text.copy(destStart, destLimit, start);
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text.handleReplaceBetween(destStart + outLen, destLimit + outLen, EMPTY);
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// Delete the old text (the key)
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text.handleReplaceBetween(start + outLen, limit + outLen, EMPTY);
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}
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if (hasCursor) {
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// Adjust the cursor for positions outside the key. These
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// refer to code points rather than code units. If cursorPos
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// is within the output string, then use newStart, which has
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// already been set above.
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if (cursorPos < 0) {
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newStart = start;
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int32_t n = cursorPos;
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// Outside the output string, cursorPos counts code points
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while (n < 0 && newStart > 0) {
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newStart -= UTF_CHAR_LENGTH(text.char32At(newStart-1));
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++n;
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}
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newStart += n;
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} else if (cursorPos > output.length()) {
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newStart = start + outLen;
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int32_t n = cursorPos - output.length();
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// Outside the output string, cursorPos counts code points
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while (n > 0 && newStart < text.length()) {
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newStart += UTF_CHAR_LENGTH(text.char32At(newStart));
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--n;
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}
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newStart += n;
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} else {
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// Cursor is within output string. It has been set up above
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// to be relative to start.
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newStart += start;
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}
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cursor = newStart;
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}
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return outLen;
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}
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/**
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* UnicodeReplacer API
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*/
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UnicodeString& StringReplacer::toReplacerPattern(UnicodeString& rule,
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UBool escapeUnprintable) const {
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rule.truncate(0);
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UnicodeString quoteBuf;
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int32_t cursor = cursorPos;
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// Handle a cursor preceding the output
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if (hasCursor && cursor < 0) {
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while (cursor++ < 0) {
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ICU_Utility::appendToRule(rule, (UChar)0x0040 /*@*/, TRUE, escapeUnprintable, quoteBuf);
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}
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// Fall through and append '|' below
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}
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for (int32_t i=0; i<output.length(); ++i) {
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if (hasCursor && i == cursor) {
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ICU_Utility::appendToRule(rule, (UChar)0x007C /*|*/, TRUE, escapeUnprintable, quoteBuf);
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}
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UChar c = output.charAt(i); // Ok to use 16-bits here
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UnicodeReplacer* r = data->lookupReplacer(c);
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if (r == NULL) {
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ICU_Utility::appendToRule(rule, c, FALSE, escapeUnprintable, quoteBuf);
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} else {
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UnicodeString buf;
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r->toReplacerPattern(buf, escapeUnprintable);
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buf.insert(0, (UChar)0x20);
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buf.append((UChar)0x20);
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ICU_Utility::appendToRule(rule, buf,
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TRUE, escapeUnprintable, quoteBuf);
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}
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}
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// Handle a cursor after the output. Use > rather than >= because
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// if cursor == output.length() it is at the end of the output,
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// which is the default position, so we need not emit it.
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if (hasCursor && cursor > output.length()) {
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cursor -= output.length();
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while (cursor-- > 0) {
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ICU_Utility::appendToRule(rule, (UChar)0x0040 /*@*/, TRUE, escapeUnprintable, quoteBuf);
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}
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ICU_Utility::appendToRule(rule, (UChar)0x007C /*|*/, TRUE, escapeUnprintable, quoteBuf);
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}
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// Flush quoteBuf out to result
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ICU_Utility::appendToRule(rule, -1,
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TRUE, escapeUnprintable, quoteBuf);
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return rule;
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}
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U_NAMESPACE_END
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//eof
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