CSV文件解析 C++ (转)

http://www.cnblogs.com/huoguofeng/archive/2010/11/24/1887087.html

其一：
/* Copyright (C) 1999 Lucent Technologies */
/* Excerpted from 'The Practice of Programming' */
/* by Brian W. Kernighan and Rob Pike */

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>

using namespace std;

class Csv
{ // read and parse comma-separated values
    // sample input: "LU",86.25,"11/4/1998","2:19PM",+4.0625

public:
    Csv(istream& fin = cin, string sep = ",") :
      fin(fin), fieldsep(sep) {}

      int getline(string&);
      string getfield(int n);
      int getnfield() const { return nfield; }

private:
    istream& fin; // input file pointer
    string line; // input line
    vector<string> field; // field strings
    int nfield; // number of fields
    string fieldsep; // separator characters

    int split();
    int endofline(char);
    int advplain(const string& line, string& fld, int);
    int advquoted(const string& line, string& fld, int);
};

// endofline: check for and consume \r, \n, \r\n, or EOF
int Csv::endofline(char c)
{
    int eol;

    eol = (c=='\r' || c=='\n');
    if (c == '\r')
    {
        fin.get(c);
        if (!fin.eof() && c != '\n')
            fin.putback(c); // read too far
    }
    return eol;
}

// getline: get one line, grow as needed
int Csv::getline(string& str)
{
    char c;

    for (line = ""; fin.get(c) && !endofline(c); )
        line += c;
    split();
    str = line;
    return !fin.eof();
}

// split: split line into fields
int Csv::split()
{
    string fld;
    int i, j;

    nfield = 0;
    if (line.length() == 0)
        return 0;
    i = 0;

    do {
        if (i < line.length() && line[i] == '"')
            j = advquoted(line, fld, ++i); // skip quote
        else
            j = advplain(line, fld, i);
        if (nfield >= field.size())
            field.push_back(fld);
        else
            field[nfield] = fld;
        nfield++;
        i = j + 1;
    } while (j < line.length());

    return nfield;
}

// advquoted: quoted field; return index of next separator
int Csv::advquoted(const string& s, string& fld, int i)
{
    int j;

    fld = "";
    for (j = i; j < s.length(); j++)
    {
        if (s[j] == '"' && s[++j] != '"')
        {
            int k = s.find_first_of(fieldsep, j);
            if (k > s.length()) // no separator found
                k = s.length();
            for (k -= j; k-- > 0; )
                fld += s[j++];
            break;
        }
        fld += s[j];
    }
    return j;
}

// advplain: unquoted field; return index of next separator
int Csv::advplain(const string& s, string& fld, int i)
{
    int j;

    j = s.find_first_of(fieldsep, i); // look for separator
    if (j > s.length()) // none found
        j = s.length();
    fld = string(s, i, j-i);
    return j;
}


// getfield: return n-th field
string Csv::getfield(int n)
{
    if (n < 0 || n >= nfield)
        return "";
    else
        return field[n];
}

// Csvtest main: test Csv class
int main(void)
{
    string line;
    Csv csv;

    while (csv.getline(line) != 0)
    {
        cout << "line = `" << line <<"'\n";
        for (int i = 0; i < csv.getnfield(); i++)
            cout << "field[" << i << "] = `"
            << csv.getfield(i) << "'\n";
    }
    return 0;
}




其二：
来源于：
头文件：
#ifndef __CSVPARSE_H_2001_06_07__
#define __CSVPARSE_H_2001_06_07__

/*
Copyright (c) 2001, Mayukh Bose
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

* Neither the name of Mayukh Bose nor the names of other
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include
using namespace std;

class CSVParser {
 private:
  string m_sData;
  string::size_type m_nPos;
  void SkipSpaces(void);
 public:
  CSVParser();
  const CSVParser & operator << (const string &sIn);
  const CSVParser & operator << (const char *sIn);
  CSVParser & operator >> (int &nOut);
  CSVParser & operator >> (double &nOut);
  CSVParser & operator >> (string &sOut);
};

#endif


cpp
/*
Copyright (c) 2001, Mayukh Bose
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

* Neither the name of Mayukh Bose nor the names of other
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include
#include
#include "csvparser.h"
using namespace std;


CSVParser::CSVParser()
{
  m_sData = "";
  m_nPos = 0;
}

void CSVParser::SkipSpaces(void)
{
  while (m_nPos < m_sData.length() && m_sData[m_nPos] == ' ')
    m_nPos++;
}

const CSVParser & CSVParser::operator <<(const string & sIn)
{
  this->m_sData = sIn;
  this->m_nPos = 0;
  return *this;
}

const CSVParser & CSVParser::operator <<(const char *sIn)
{
  this->m_sData = sIn;
  this->m_nPos = 0;
  return *this;
}

CSVParser & CSVParser::operator >>(int & nOut)
{
  string sTmp = "";
  SkipSpaces();
  while (m_nPos < m_sData.length() && m_sData[m_nPos] != ',')
    sTmp += m_sData[m_nPos++];

  m_nPos++; // skip past comma
  nOut = atoi(sTmp.c_str());
  return *this;
}

CSVParser & CSVParser::operator >>(double & nOut)
{
  string sTmp = "";
  SkipSpaces();
  while (m_nPos < m_sData.length() && m_sData[m_nPos] != ',')
    sTmp += m_sData[m_nPos++];

  m_nPos++; // skip past comma
  nOut = atof(sTmp.c_str());
  return *this;
}

CSVParser & CSVParser::operator >>(string & sOut)
{
  bool bQuotes = false;
  sOut = "";
  SkipSpaces();

  // Jump past first " if necessary
  if (m_nPos < m_sData.length() && m_sData[m_nPos] == '"') {
    bQuotes = true;
    m_nPos++;
  }

  while (m_nPos < m_sData.length()) {
    if (!bQuotes && m_sData[m_nPos] == ',')
      break;
    if (bQuotes && m_sData[m_nPos] == '"') {
      if (m_nPos + 1 >= m_sData.length() - 1)
        break;
      if (m_sData[m_nPos+1] == ',')
        break;
    }
    sOut += m_sData[m_nPos++];
  }

  // Jump past last " if necessary
  if (bQuotes && m_nPos < m_sData.length() && m_sData[m_nPos] == '"')
    m_nPos++;

  // Jump past , if necessary
  if (m_nPos < m_sData.length() && m_sData[m_nPos] == ',')
    m_nPos++;

  return *this;
}

demo : csvclass.zip   

Demo2，已经验证： CsvParse_CppVersion.zip