[cocos2dx utils] cocos2dx读取，解析csv文件

在我们的游戏中，经常需要将策划的数值配置成csv文件，所以解析csv文件就是一个很common的logic，

例如如下csv文件：

下面是一个基于cocos2dx 2.2.4的实现类：

#ifndef __Cell__GCCsvHelper__
#define __Cell__GCCsvHelper__

#include <iostream>
#include "cocos2d.h"
#include <vector>

USING_NS_CC;

class GCCsvHelper
{
public:
    GCCsvHelper();
    ~GCCsvHelper();

    bool openAndResolveFile(const char *fileName);

    const char *getData(unsigned int rowIndex, unsigned int colIndex);

    inline int getColLength() { return m_colLength; }
    inline int getRowLength() {    return data.size(); }

private:
    const std::string m_seperator;
    std::vector<std::vector<std::string> > data;

    //cols length
    int m_colLength;

    void rowSplit(std::vector<std::string> &rows, const std::string &content, const char &rowSeperator);
    void fieldSplit(std::vector<std::string> &fields, std::string line);

    //获取带引号的字段
    int getFieldWithQuoted(const std::string &line, std::string& field, int index);

    //获取无引号的字段
    int getFieldNoQuoted(const std::string &line, std::string &field, int index);
};

#endif /* defined(__Cell__GCCsvHelper__) */

#include "GCCsvHelper.h"

GCCsvHelper::GCCsvHelper()
:m_seperator(",")
,m_colLength(0)
{

}

GCCsvHelper::~GCCsvHelper()
{

}

#pragma region reselove the content begin...

bool GCCsvHelper::openAndResolveFile(const char *fileName)
{
    std::string pathKey = CCFileUtils::sharedFileUtils()->fullPathForFilename(fileName);
    unsigned char* pBuffer = NULL;
    unsigned long bufferSize = 0;
    pBuffer = CCFileUtils::sharedFileUtils()->getFileData(pathKey.c_str(), "r", &bufferSize);

    std::string tmpStr = (char*)pBuffer;
    std::string fileContent = tmpStr.substr(0, bufferSize);

    std::vector<std::string> line;
    rowSplit(line, fileContent, ‘\n‘);
    for (unsigned int i = 0; i < line.size(); ++i) {
        std::vector<std::string> fieldVector;
        fieldSplit(fieldVector, line[i]);
        data.push_back(fieldVector);
        m_colLength = std::max(m_colLength, (int)fieldVector.size());
    }

    return true;
}

void GCCsvHelper::rowSplit(std::vector<std::string> &rows, const std::string &content, const char &rowSeperator)
{
    std::string::size_type lastIndex = content.find_first_not_of(rowSeperator, 0);
    std::string::size_type    currentIndex = content.find_first_of(rowSeperator,lastIndex);

    while (std::string::npos != currentIndex || std::string::npos != lastIndex) {
        rows.push_back(content.substr(lastIndex, currentIndex - lastIndex));
        lastIndex = content.find_first_not_of(rowSeperator, currentIndex);
        currentIndex = content.find_first_of(rowSeperator, lastIndex);
    }
}

void GCCsvHelper::fieldSplit(std::vector<std::string> &fields, std::string line)
{
    if (line[line.length() - 1] == ‘\r‘) {
        line = line.substr(0, line.length() - 1);
    }

    std::string field;
    unsigned int i = 0, j = 0;
    while (j < line.length()) {
        if (line[i] == ‘"‘) {
            //有引号
            j = getFieldWithQuoted(line, field, i);
        } else {
            j = getFieldNoQuoted(line, field, i);
        }

        fields.push_back(field);
        i = j + 1; //解析下一个field， ＋1为了跳过当前的分隔符
    }
}

int GCCsvHelper::getFieldWithQuoted(const std::string &line, std::string &field, int i)
{
    unsigned int j = 0;
    field = std::string();
    if (line[i] != ‘"‘) {
        //不是引号起始，有问题
        CCLOGERROR("start char is not quote when call %s", __FUNCTION__);
        return -1;
    }

    for (j = i + 1; j < line.length() - 1; ++j) {
        if (line[j] != ‘"‘) {
            //当前char不为引号，则是field内容(包括逗号)
            field += line[j];
        } else {
            //遇到field结束时的引号，可以返回
            return j;
            break;
        }
    }

    if (j == line.length()) {
        //没有找到成对的结束引号
        CCLOGERROR("resoleve the line error: no pair quote, line:%s, field:%s, start index:%d", line.c_str(), field.c_str(), i);
    }

    return j;
}

int GCCsvHelper::getFieldNoQuoted(const std::string &line, std::string &field, int index)
{
    unsigned int j = 0;
    //找到下一个分隔符位置
    j = line.find_first_of(m_seperator, index);
    if (j > line.length()) {
        j = line.length();
    }

    field = std::string(line, index, j - index);

    return j;
}

#pragma region end.

///////search data
const char *GCCsvHelper::getData(unsigned int rowIndex, unsigned int colIndex)
{
    if (rowIndex >= getRowLength() || colIndex >= getColLength()) {
        return "";
    }

    if (colIndex >= data[rowIndex].size()) {
        return "";
    }

    return data[rowIndex][colIndex].c_str();
}

Test Case:

void CsvHelperTesterScene::onEnter()
{
    CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();

    GCCsvHelper *csv = new GCCsvHelper();
    csv->openAndResolveFile("test.csv");

    std::string line = "";
    for (int i = 0; i < csv->getRowLength(); ++i) {
        for (int j = 0; j < csv->getColLength(); ++j) {
            line += csv->getData(i, j);
            line += ";";
        }

        CCLabelTTF *pLbl = CCLabelTTF::create(line.c_str(), "Arial", 20);
        pLbl->setColor(ccc3(255, 250, 250));
        pLbl->setPosition(ccp(visibleSize.width / 2, visibleSize.height - 200 - i * 30));
        addChild(pLbl);

        line = "";
    }

    delete csv;
}

测试结果：