127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
#pragma once
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#include "limonp/Logging.hpp"
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#include <unordered_set>
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#include "Unicode.hpp"
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namespace cppjieba {
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class PreFilter {
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public:
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PreFilter(const std::unordered_set<Rune>& symbols,
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const string& sentence)
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: symbols_(symbols) {
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if (!DecodeRunesInString(sentence, sentence_)) {
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XLOG(ERROR) << "decode failed. "<<sentence;
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}
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cursor_ = sentence_.begin();
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}
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~PreFilter() {
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}
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bool HasNext() const {
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return cursor_ != sentence_.end();
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}
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bool Next(WordRange& wordRange) {
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if (cursor_ == sentence_.end()) {
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return false;
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}
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wordRange.left = cursor_;
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while (cursor_->rune == 0x20 && cursor_ != sentence_.end()) {
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cursor_++;
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}
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if (cursor_ == sentence_.end()) {
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wordRange.right = cursor_;
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return true;
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}
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while (++cursor_ != sentence_.end()) {
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if (cursor_->rune == 0x20) {
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wordRange.right = cursor_;
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return true;
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}
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}
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wordRange.right = sentence_.end();
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return true;
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}
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bool Next(WordRange& wordRange, bool& isNull) {
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isNull = false;
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if (cursor_ == sentence_.end()) {
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return false;
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}
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wordRange.left = cursor_;
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if (cursor_->rune == 0x20) {
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while (cursor_ != sentence_.end()) {
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if (cursor_->rune != 0x20) {
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if (wordRange.left == cursor_) {
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cursor_ ++;
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}
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wordRange.right = cursor_;
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isNull = true;
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return true;
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}
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cursor_ ++;
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}
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}
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int max_num = 0;
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uint32_t utf8_num = cursor_->len;
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while (cursor_ != sentence_.end()) {
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if (cursor_->rune == 0x20) {
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if (wordRange.left == cursor_) {
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cursor_ ++;
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}
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wordRange.right = cursor_;
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return true;
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}
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cursor_ ++;
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max_num++;
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if (max_num >= 1024 or cursor_->len != utf8_num) { //todo 防止一次性传入过多字节，暂定限制为1024个字
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wordRange.right = cursor_;
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return true;
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}
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}
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wordRange.right = sentence_.end();
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return true;
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}
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WordRange Next() {
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WordRange range(cursor_, cursor_);
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while (cursor_ != sentence_.end()) {
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//if (IsIn(symbols_, cursor_->rune)) {
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if (cursor_->rune == 0x20) {
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if (range.left == cursor_) {
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cursor_ ++;
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}
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range.right = cursor_;
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return range;
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}
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cursor_ ++;
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}
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range.right = sentence_.end();
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return range;
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}
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private:
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RuneStrArray::const_iterator cursor_;
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RuneStrArray sentence_;
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const std::unordered_set<Rune>& symbols_;
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}; // class PreFilter
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} // namespace cppjieba
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