tidy.cpp

c++ GUI Programming with QT4书中的源码

#include <QtCore>
#include <cstdio>

using namespace std;

void tidyFile(QIODevice *inDevice, QIODevice *outDevice)
{
    QTextStream in(inDevice);
    QTextStream out(outDevice);

    const int TabSize = 8;
    int endlCount = 0;
    int spaceCount = 0;
    int column = 0;
    QChar ch;

    while (!in.atEnd()) {
        in >> ch;

        if (ch == '\n') {
            ++endlCount;
            spaceCount = 0;
            column = 0;
        } else if (ch == '\t') {
            int size = TabSize - (column % TabSize);
            spaceCount += size;
            column += size;
        } else if (ch == ' ') {
            ++spaceCount;
            ++column;
        } else {
            while (endlCount > 0) {
                out << endl;
                --endlCount;
                column = 0;
            }
            while (spaceCount > 0) {
                out << ' ';
                --spaceCount;
                ++column;
            }
            out << ch;
            ++column;
        }
    }
    out << endl;
}

int main()
{
    QFile inFile;
    QFile outFile;

    inFile.open(stdin, QFile::ReadOnly);
    outFile.open(stdout, QFile::WriteOnly);

    tidyFile(&inFile, &outFile);

    return 0;
}