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morfeusz/charset/TextReader.cpp 2.6 KB
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/* 
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 * File:   TextReader.cpp
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 * Author: lennyn
 * 
 * Created on May 28, 2014, 11:43 AM
 */

#include "TextReader.hpp"
#include "charset_utils.hpp"
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using namespace std;
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namespace morfeusz {
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TextReader::TextReader(
    const char* inputStart, 
    const char* inputEnd, 
    const Environment& env)
: codepointsNum(0),
    wordStartPtr(inputStart),
    currPtr(inputStart),
        inputEnd(inputEnd), 
        env(env),
        knowsAboutWhitespace(false),
        atWhitespace(false),
        peekIsRead(false),
        thePeek(0x00),
        theNormalizedPeek(0x00),
        ptrAfterThePeek(NULL) {}

void TextReader::markWordStartsHere() {
    codepointsNum = 0;
    wordStartPtr = currPtr;
}

const char* TextReader::getWordStartPtr() const {
    return wordStartPtr;
}

const char* TextReader::getCurrPtr() const {
    return currPtr;
}

const char* TextReader::getNextPtr() {
    if (!peekIsRead) {
        peek();
    }
    return ptrAfterThePeek;
}

const char* TextReader::getEndPtr() const {
    return inputEnd;
}

int TextReader::getCodepointsRead() const {
    return codepointsNum;
}

bool TextReader::isAtEnd() const {
    return currPtr == inputEnd;
}

bool TextReader::isAtWhitespace() {
    if (isAtEnd()) {
        return true;
    }
    else {
        if (!peekIsRead) {
            peek();
        }
        return atWhitespace;
    }
}
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bool TextReader::isInsideAWord() {
    return !isAtEnd() && !isAtWhitespace();
}
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uint32_t TextReader::peek() {
    if (peekIsRead) {
        return thePeek;
    }
    else {
        ptrAfterThePeek = currPtr;
        thePeek = env.getCharsetConverter().next(ptrAfterThePeek, inputEnd);
        theNormalizedPeek = env.getProcessorType() == ANALYZER
                ? env.getCaseConverter().toLower(thePeek)
                : thePeek;
        atWhitespace = isWhitespace(thePeek);
        peekIsRead = true;
        return thePeek;
    }
}

uint32_t TextReader::normalizedPeek() {
    if (!peekIsRead) {
        peek();
    }
    return theNormalizedPeek;
}

uint32_t TextReader::next() {
    if (!peekIsRead) {
        peek();
    }
    currPtr = ptrAfterThePeek;
    peekIsRead = false;
    knowsAboutWhitespace = false;
    codepointsNum++;
    return thePeek;
}

void TextReader::skipWhitespaces() {
    while (!isAtEnd() && isAtWhitespace()) {
        next();
    }
}
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string TextReader::readWhitespacesChunk() {
    const char* startPtr = currPtr;
    while (!isAtEnd() && isAtWhitespace()) {
        next();
    }
    string res(startPtr, currPtr);
    return res;
}
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void TextReader::proceedToEnd() {
    while (!isAtEnd()) {
        next();
    }
}

TextReader::~TextReader() {

}
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}