92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
#include "csv.hpp"
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#include <istream>
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#include <string>
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#include <vector>
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namespace csv {
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enum class CSVState {
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UnquotedField,
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QuotedField,
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QuotedQuote
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};
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// this function has been made in collaboration with
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// StackOverflow https://stackoverflow.com/a/30338543
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void readCSVRow(const std::string& row, std::vector<std::string>& fields) {
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fields.push_back("");
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CSVState state = CSVState::UnquotedField;
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size_t i = 0; // index of the current field
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for (char c : row) {
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switch (state) {
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case CSVState::UnquotedField:
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switch (c) {
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case ',': // end of field
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fields.push_back("");
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i++;
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break;
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case '"':
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state = CSVState::QuotedField;
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break;
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default:
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fields[i].push_back(c);
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break;
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}
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break;
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case CSVState::QuotedField:
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switch (c) {
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case '"':
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state = CSVState::QuotedQuote;
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break;
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default:
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fields[i].push_back(c);
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break;
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}
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break;
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case CSVState::QuotedQuote:
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switch (c) {
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case ',': // , after closing quote
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fields.push_back("");
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i++;
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state = CSVState::UnquotedField;
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break;
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case '"': // "" -> "
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fields[i].push_back('"');
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state = CSVState::QuotedField;
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break;
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default: // end of quote
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state = CSVState::UnquotedField;
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break;
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}
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break;
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}
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}
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}
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bool CsvReader::operator>>(std::vector<std::string>& line) {
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line.clear();
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if (!m_stream) {
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return false;
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}
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std::string row;
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std::getline(m_stream, row);
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readCSVRow(row, line);
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return !!m_stream;
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}
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}
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