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      1 /*
      2 **********************************************************************
      3 *   Copyright (C) 1999-2011, International Business Machines
      4 *   Corporation and others.  All Rights Reserved.
      5 **********************************************************************
      6 */
      7 
      8 #include "unicode/chariter.h"
      9 
     10 U_NAMESPACE_BEGIN
     11 
     12 ForwardCharacterIterator::~ForwardCharacterIterator() {}
     13 ForwardCharacterIterator::ForwardCharacterIterator()
     14 : UObject()
     15 {}
     16 ForwardCharacterIterator::ForwardCharacterIterator(const ForwardCharacterIterator &other)
     17 : UObject(other)
     18 {}
     19 
     20 
     21 CharacterIterator::CharacterIterator()
     22 : textLength(0), pos(0), begin(0), end(0) {
     23 }
     24 
     25 CharacterIterator::CharacterIterator(int32_t length)
     26 : textLength(length), pos(0), begin(0), end(length) {
     27     if(textLength < 0) {
     28         textLength = end = 0;
     29     }
     30 }
     31 
     32 CharacterIterator::CharacterIterator(int32_t length, int32_t position)
     33 : textLength(length), pos(position), begin(0), end(length) {
     34     if(textLength < 0) {
     35         textLength = end = 0;
     36     }
     37     if(pos < 0) {
     38         pos = 0;
     39     } else if(pos > end) {
     40         pos = end;
     41     }
     42 }
     43 
     44 CharacterIterator::CharacterIterator(int32_t length, int32_t textBegin, int32_t textEnd, int32_t position)
     45 : textLength(length), pos(position), begin(textBegin), end(textEnd) {
     46     if(textLength < 0) {
     47         textLength = 0;
     48     }
     49     if(begin < 0) {
     50         begin = 0;
     51     } else if(begin > textLength) {
     52         begin = textLength;
     53     }
     54     if(end < begin) {
     55         end = begin;
     56     } else if(end > textLength) {
     57         end = textLength;
     58     }
     59     if(pos < begin) {
     60         pos = begin;
     61     } else if(pos > end) {
     62         pos = end;
     63     }
     64 }
     65 
     66 CharacterIterator::~CharacterIterator() {}
     67 
     68 CharacterIterator::CharacterIterator(const CharacterIterator &that) :
     69 ForwardCharacterIterator(that),
     70 textLength(that.textLength), pos(that.pos), begin(that.begin), end(that.end)
     71 {
     72 }
     73 
     74 CharacterIterator &
     75 CharacterIterator::operator=(const CharacterIterator &that) {
     76     ForwardCharacterIterator::operator=(that);
     77     textLength = that.textLength;
     78     pos = that.pos;
     79     begin = that.begin;
     80     end = that.end;
     81     return *this;
     82 }
     83 
     84 // implementing first[32]PostInc() directly in a subclass should be faster
     85 // but these implementations make subclassing a little easier
     86 UChar
     87 CharacterIterator::firstPostInc(void) {
     88     setToStart();
     89     return nextPostInc();
     90 }
     91 
     92 UChar32
     93 CharacterIterator::first32PostInc(void) {
     94     setToStart();
     95     return next32PostInc();
     96 }
     97 
     98 U_NAMESPACE_END
     99