initial commit, 4.5 stable

thirdparty/icu4c/common/uchriter.cpp

@@ -0,0 +1,368 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+* Copyright (C) 1998-2012, International Business Machines Corporation and
+* others. All Rights Reserved.
+******************************************************************************
+*/
+
+#include "utypeinfo.h"  // for 'typeid' to work
+
+#include "unicode/uchriter.h"
+#include "unicode/ustring.h"
+#include "unicode/utf16.h"
+#include "ustr_imp.h"
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UCharCharacterIterator)
+
+UCharCharacterIterator::UCharCharacterIterator()
+  : CharacterIterator(),
+  text(nullptr)
+{
+    // never default construct!
+}
+
+UCharCharacterIterator::UCharCharacterIterator(ConstChar16Ptr textPtr,
+                                               int32_t length)
+  : CharacterIterator(textPtr != nullptr ? (length >= 0 ? length : u_strlen(textPtr)) : 0),
+  text(textPtr)
+{
+}
+
+UCharCharacterIterator::UCharCharacterIterator(ConstChar16Ptr textPtr,
+                                               int32_t length,
+                                               int32_t position)
+  : CharacterIterator(textPtr != nullptr ? (length >= 0 ? length : u_strlen(textPtr)) : 0, position),
+  text(textPtr)
+{
+}
+
+UCharCharacterIterator::UCharCharacterIterator(ConstChar16Ptr textPtr,
+                                               int32_t length,
+                                               int32_t textBegin,
+                                               int32_t textEnd,
+                                               int32_t position)
+  : CharacterIterator(textPtr != nullptr ? (length >= 0 ? length : u_strlen(textPtr)) : 0,
+                      textBegin, textEnd, position),
+  text(textPtr)
+{
+}
+
+UCharCharacterIterator::UCharCharacterIterator(const UCharCharacterIterator& that)
+: CharacterIterator(that),
+  text(that.text)
+{
+}
+
+UCharCharacterIterator&
+UCharCharacterIterator::operator=(const UCharCharacterIterator& that) {
+    CharacterIterator::operator=(that);
+    text = that.text;
+    return *this;
+}
+
+UCharCharacterIterator::~UCharCharacterIterator() {
+}
+
+bool
+UCharCharacterIterator::operator==(const ForwardCharacterIterator& that) const {
+    if (this == &that) {
+        return true;
+    }
+    if (typeid(*this) != typeid(that)) {
+        return false;
+    }
+
+    const UCharCharacterIterator&    realThat = static_cast<const UCharCharacterIterator&>(that);
+
+    return text == realThat.text
+        && textLength == realThat.textLength
+        && pos == realThat.pos
+        && begin == realThat.begin
+        && end == realThat.end;
+}
+
+int32_t
+UCharCharacterIterator::hashCode() const {
+    return ustr_hashUCharsN(text, textLength) ^ pos ^ begin ^ end;
+}
+
+UCharCharacterIterator*
+UCharCharacterIterator::clone() const {
+    return new UCharCharacterIterator(*this);
+}
+
+char16_t
+UCharCharacterIterator::first() {
+    pos = begin;
+    if(pos < end) {
+        return text[pos];
+    } else {
+        return DONE;
+    }
+}
+
+char16_t
+UCharCharacterIterator::firstPostInc() {
+    pos = begin;
+    if(pos < end) {
+        return text[pos++];
+    } else {
+        return DONE;
+    }
+}
+
+char16_t
+UCharCharacterIterator::last() {
+    pos = end;
+    if(pos > begin) {
+        return text[--pos];
+    } else {
+        return DONE;
+    }
+}
+
+char16_t
+UCharCharacterIterator::setIndex(int32_t position) {
+    if(position < begin) {
+        pos = begin;
+    } else if(position > end) {
+        pos = end;
+    } else {
+        pos = position;
+    }
+    if(pos < end) {
+        return text[pos];
+    } else {
+        return DONE;
+    }
+}
+
+char16_t
+UCharCharacterIterator::current() const {
+    if (pos >= begin && pos < end) {
+        return text[pos];
+    } else {
+        return DONE;
+    }
+}
+
+char16_t
+UCharCharacterIterator::next() {
+    if (pos + 1 < end) {
+        return text[++pos];
+    } else {
+        /* make current() return DONE */
+        pos = end;
+        return DONE;
+    }
+}
+
+char16_t
+UCharCharacterIterator::nextPostInc() {
+    if (pos < end) {
+        return text[pos++];
+    } else {
+        return DONE;
+    }
+}
+
+UBool
+UCharCharacterIterator::hasNext() {
+    return pos < end;
+}
+
+char16_t
+UCharCharacterIterator::previous() {
+    if (pos > begin) {
+        return text[--pos];
+    } else {
+        return DONE;
+    }
+}
+
+UBool
+UCharCharacterIterator::hasPrevious() {
+    return pos > begin;
+}
+
+UChar32
+UCharCharacterIterator::first32() {
+    pos = begin;
+    if(pos < end) {
+        int32_t i = pos;
+        UChar32 c;
+        U16_NEXT(text, i, end, c);
+        return c;
+    } else {
+        return DONE;
+    }
+}
+
+UChar32
+UCharCharacterIterator::first32PostInc() {
+    pos = begin;
+    if(pos < end) {
+        UChar32 c;
+        U16_NEXT(text, pos, end, c);
+        return c;
+    } else {
+        return DONE;
+    }
+}
+
+UChar32
+UCharCharacterIterator::last32() {
+    pos = end;
+    if(pos > begin) {
+        UChar32 c;
+        U16_PREV(text, begin, pos, c);
+        return c;
+    } else {
+        return DONE;
+    }
+}
+
+UChar32
+UCharCharacterIterator::setIndex32(int32_t position) {
+    if(position < begin) {
+        position = begin;
+    } else if(position > end) {
+        position = end;
+    }
+    if(position < end) {
+        U16_SET_CP_START(text, begin, position);
+        int32_t i = this->pos = position;
+        UChar32 c;
+        U16_NEXT(text, i, end, c);
+        return c;
+    } else {
+        this->pos = position;
+        return DONE;
+    }
+}
+
+UChar32
+UCharCharacterIterator::current32() const {
+    if (pos >= begin && pos < end) {
+        UChar32 c;
+        U16_GET(text, begin, pos, end, c);
+        return c;
+    } else {
+        return DONE;
+    }
+}
+
+UChar32
+UCharCharacterIterator::next32() {
+    if (pos < end) {
+        U16_FWD_1(text, pos, end);
+        if(pos < end) {
+            int32_t i = pos;
+            UChar32 c;
+            U16_NEXT(text, i, end, c);
+            return c;
+        }
+    }
+    /* make current() return DONE */
+    pos = end;
+    return DONE;
+}
+
+UChar32
+UCharCharacterIterator::next32PostInc() {
+    if (pos < end) {
+        UChar32 c;
+        U16_NEXT(text, pos, end, c);
+        return c;
+    } else {
+        return DONE;
+    }
+}
+
+UChar32
+UCharCharacterIterator::previous32() {
+    if (pos > begin) {
+        UChar32 c;
+        U16_PREV(text, begin, pos, c);
+        return c;
+    } else {
+        return DONE;
+    }
+}
+
+int32_t
+UCharCharacterIterator::move(int32_t delta, CharacterIterator::EOrigin origin) {
+    switch(origin) {
+    case kStart:
+        pos = begin + delta;
+        break;
+    case kCurrent:
+        pos += delta;
+        break;
+    case kEnd:
+        pos = end + delta;
+        break;
+    default:
+        break;
+    }
+
+    if(pos < begin) {
+        pos = begin;
+    } else if(pos > end) {
+        pos = end;
+    }
+
+    return pos;
+}
+
+int32_t
+UCharCharacterIterator::move32(int32_t delta, CharacterIterator::EOrigin origin) {
+    // this implementation relies on the "safe" version of the UTF macros
+    // (or the trustworthiness of the caller)
+    switch(origin) {
+    case kStart:
+        pos = begin;
+        if(delta > 0) {
+            U16_FWD_N(text, pos, end, delta);
+        }
+        break;
+    case kCurrent:
+        if(delta > 0) {
+            U16_FWD_N(text, pos, end, delta);
+        } else {
+            U16_BACK_N(text, begin, pos, -delta);
+        }
+        break;
+    case kEnd:
+        pos = end;
+        if(delta < 0) {
+            U16_BACK_N(text, begin, pos, -delta);
+        }
+        break;
+    default:
+        break;
+    }
+
+    return pos;
+}
+
+void UCharCharacterIterator::setText(ConstChar16Ptr newText,
+                                     int32_t      newTextLength) {
+    text = newText;
+    if (newText == nullptr || newTextLength < 0) {
+        newTextLength = 0;
+    }
+    end = textLength = newTextLength;
+    pos = begin = 0;
+}
+
+void
+UCharCharacterIterator::getText(UnicodeString& result) {
+    result = UnicodeString(text, textLength);
+}
+
+U_NAMESPACE_END