Check in the pristine copy of ICU 4.6...

icu46/source/i18n/brktrans.cpp

+/*
+**********************************************************************
+*   Copyright (C) 2008-2010, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*   Date        Name        Description
+*   05/11/2008  Andy Heninger  Port from Java
+**********************************************************************
+*/
+
+#include "unicode/utypes.h"
+
+#if  !UCONFIG_NO_TRANSLITERATION && !UCONFIG_NO_BREAK_ITERATION
+
+#include "unicode/unifilt.h"
+#include "unicode/uchar.h"
+#include "unicode/uniset.h"
+#include "unicode/brkiter.h"
+#include "brktrans.h"
+#include "unicode/uchar.h"
+#include "cmemory.h"
+#include "uprops.h"
+#include "uinvchar.h"
+#include "util.h"
+#include "uvectr32.h"
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(BreakTransliterator)
+
+static const UChar SPACE       = 32;  // ' '
+
+
+/**
+ * Constructs a transliterator with the default delimiters '{' and
+ * '}'.
+ */
+BreakTransliterator::BreakTransliterator(UnicodeFilter* adoptedFilter) :
+    Transliterator(UNICODE_STRING("Any-BreakInternal", 17), adoptedFilter),
+    fInsertion(SPACE) {
+        bi = NULL;
+        UErrorCode status = U_ZERO_ERROR;
+        boundaries = new UVector32(status);
+    }
+
+
+/**
+ * Destructor.
+ */
+BreakTransliterator::~BreakTransliterator() {
+    delete bi;
+    bi = NULL;
+    delete boundaries;
+    boundaries = NULL;
+}
+
+/**
+ * Copy constructor.
+ */
+BreakTransliterator::BreakTransliterator(const BreakTransliterator& o) :
+    Transliterator(o) {
+        bi = NULL;
+        if (o.bi != NULL) {
+            bi = o.bi->clone();
+        }
+        fInsertion = o.fInsertion;
+        UErrorCode status = U_ZERO_ERROR;
+        boundaries = new UVector32(status);
+    }
+
+
+/**
+ * Transliterator API.
+ */
+Transliterator* BreakTransliterator::clone(void) const {
+    return new BreakTransliterator(*this);
+}
+
+/**
+ * Implements {@link Transliterator#handleTransliterate}.
+ */
+void BreakTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
+                                                    UBool isIncremental ) const {
+
+        UErrorCode status = U_ZERO_ERROR;
+        boundaries->removeAllElements();
+        BreakTransliterator *nonConstThis = (BreakTransliterator *)this;
+        nonConstThis->getBreakIterator(); // Lazy-create it if necessary
+        UnicodeString sText = replaceableAsString(text);
+        bi->setText(sText);
+        bi->preceding(offsets.start);
+
+        // To make things much easier, we will stack the boundaries, and then insert at the end.
+        // generally, we won't need too many, since we will be filtered.
+
+        int32_t boundary;
+        for(boundary = bi->next(); boundary != UBRK_DONE && boundary < offsets.limit; boundary = bi->next()) {
+            if (boundary == 0) continue;
+            // HACK: Check to see that preceeding item was a letter
+
+            UChar32 cp = sText.char32At(boundary-1);
+            int type = u_charType(cp);
+            //System.out.println(Integer.toString(cp,16) + " (before): " + type);
+            if ((U_MASK(type) & (U_GC_L_MASK | U_GC_M_MASK)) == 0) continue;
+
+            cp = sText.char32At(boundary);
+            type = u_charType(cp);
+            //System.out.println(Integer.toString(cp,16) + " (after): " + type);
+            if ((U_MASK(type) & (U_GC_L_MASK | U_GC_M_MASK)) == 0) continue;
+
+            boundaries->addElement(boundary, status);
+            // printf("Boundary at %d\n", boundary);
+        }
+
+        int delta = 0;
+        int lastBoundary = 0;
+
+        if (boundaries->size() != 0) { // if we found something, adjust
+            delta = boundaries->size() * fInsertion.length();
+            lastBoundary = boundaries->lastElementi();
+
+            // we do this from the end backwards, so that we don't have to keep updating.
+
+            while (boundaries->size() > 0) {
+                boundary = boundaries->popi();
+                text.handleReplaceBetween(boundary, boundary, fInsertion);
+            }
+        }
+
+        // Now fix up the return values
+        offsets.contextLimit += delta;
+        offsets.limit += delta;
+        offsets.start = isIncremental ? lastBoundary + delta : offsets.limit;
+
+        // TODO:  do something with U_FAILURE(status);
+        //        (need to look at transliterators overall, not just here.)
+}
+
+//
+//  getInsertion()
+//
+const UnicodeString &BreakTransliterator::getInsertion() const {
+    return fInsertion;
+}
+
+//
+//  setInsertion()
+//
+void BreakTransliterator::setInsertion(const UnicodeString &insertion) {
+    this->fInsertion = insertion;
+}
+
+//
+//  getBreakIterator     Lazily create the break iterator if it does
+//                       not already exist.  Copied from Java, probably
+//                       better to just create it in the constructor.
+//
+BreakIterator *BreakTransliterator::getBreakIterator() {
+    UErrorCode status = U_ZERO_ERROR;
+    if (bi == NULL) {
+        // Note:  Thai breaking behavior is universal, it is not
+        //        tied to the Thai locale.
+        bi = BreakIterator::createWordInstance(Locale::getEnglish(), status);
+    }
+    return bi;
+}
+
+//
+//   replaceableAsString   Hack to let break iterators work
+//                         on the replaceable text from transliterators.
+//                         In practice, the only real Replaceable type that we
+//                         will be seeing is UnicodeString, so this function
+//                         will normally be efficient.
+//
+UnicodeString BreakTransliterator::replaceableAsString(Replaceable &r) {
+    UnicodeString s;
+    UnicodeString *rs = dynamic_cast<UnicodeString *>(&r);
+    if (rs != NULL) {
+        s = *rs;
+    } else {
+        r.extractBetween(0, r.length(), s);
+    }
+    return s;
+}
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_TRANSLITERATION */