122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2010-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* file name: ucharstrieiterator.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2010nov15
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* created by: Markus W. Scherer
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*/
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#ifndef __UCHARSTRIEITERATOR_H__
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#define __UCHARSTRIEITERATOR_H__
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/**
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* \file
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* \brief C++ API: UCharsTrie iterator for all of its (string, value) pairs.
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*/
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#include "unicode/utypes.h"
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#include "unicode/unistr.h"
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#include "ucharstrie.h"
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#include "uvectr32.h"
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U_NAMESPACE_BEGIN
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/**
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* Iterator for all of the (string, value) pairs in a UCharsTrie.
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*/
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class U_TOOLUTIL_API UCharsTrieIterator : public UMemory {
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public:
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/**
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* Iterates from the root of a UChar-serialized UCharsTrie.
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* @param trieUChars The trie UChars.
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* @param maxStringLength If 0, the iterator returns full strings.
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* Otherwise, the iterator returns strings with this maximum length.
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* @param errorCode Standard ICU error code. Its input value must
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* pass the U_SUCCESS() test, or else the function returns
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* immediately. Check for U_FAILURE() on output or use with
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* function chaining. (See User Guide for details.)
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*/
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UCharsTrieIterator(const UChar *trieUChars, int32_t maxStringLength, UErrorCode &errorCode);
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/**
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* Iterates from the current state of the specified UCharsTrie.
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* @param trie The trie whose state will be copied for iteration.
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* @param maxStringLength If 0, the iterator returns full strings.
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* Otherwise, the iterator returns strings with this maximum length.
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* @param errorCode Standard ICU error code. Its input value must
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* pass the U_SUCCESS() test, or else the function returns
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* immediately. Check for U_FAILURE() on output or use with
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* function chaining. (See User Guide for details.)
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*/
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UCharsTrieIterator(const UCharsTrie &trie, int32_t maxStringLength, UErrorCode &errorCode);
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/**
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* Resets this iterator to its initial state.
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*/
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UCharsTrieIterator &reset();
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/**
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* Finds the next (string, value) pair if there is one.
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*
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* If the string is truncated to the maximum length and does not
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* have a real value, then the value is set to -1.
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* In this case, this "not a real value" is indistinguishable from
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* a real value of -1.
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* @return TRUE if there is another element.
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*/
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UBool next(UErrorCode &errorCode);
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/**
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* @return TRUE if there are more elements.
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*/
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UBool hasNext() const { return pos_!=NULL || !stack_.isEmpty(); }
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/**
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* @return the NUL-terminated string for the last successful next()
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*/
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const UnicodeString &getString() const { return str_; }
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/**
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* @return the value for the last successful next()
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*/
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int32_t getValue() const { return value_; }
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private:
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UBool truncateAndStop() {
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pos_=NULL;
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value_=-1; // no real value for str
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return TRUE;
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}
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const UChar *branchNext(const UChar *pos, int32_t length, UErrorCode &errorCode);
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const UChar *uchars_;
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const UChar *pos_;
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const UChar *initialPos_;
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int32_t remainingMatchLength_;
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int32_t initialRemainingMatchLength_;
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UBool skipValue_; // Skip intermediate value which was already delivered.
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UnicodeString str_;
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int32_t maxLength_;
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int32_t value_;
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// The stack stores pairs of integers for backtracking to another
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// outbound edge of a branch node.
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// The first integer is an offset from ByteTrie.bytes.
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// The second integer has the str.length() from before the node in bits 15..0,
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// and the remaining branch length in bits 31..16.
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// (We could store the remaining branch length minus 1 in bits 30..16 and not use the sign bit,
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// but the code looks more confusing that way.)
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UVector32 stack_;
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};
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U_NAMESPACE_END
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#endif // __UCHARSTRIEITERATOR_H__
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