109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
/**
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*
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* CsvReader.cpp: Simple Csv parser for comma separated values, with double quotes suppport
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*
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* MIT License
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*
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* Copyright (c) 2020 InfluxData
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "CsvReader.h"
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CsvReader::CsvReader(HttpStreamScanner *scanner) {
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_scanner = scanner;
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}
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CsvReader::~CsvReader() {
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delete _scanner;
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}
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std::vector<String> CsvReader::getRow() {
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return _row;
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};
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void CsvReader::close() {
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clearRow();
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_scanner->close();
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}
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void CsvReader::clearRow() {
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std::for_each(_row.begin(), _row.end(), [](String &value){ value = (const char *)nullptr; });
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_row.clear();
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}
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enum class CsvParsingState {
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UnquotedField,
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QuotedField,
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QuotedQuote
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};
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bool CsvReader::next() {
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clearRow();
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bool status = _scanner->next();
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if(!status) {
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_error = _scanner->getError();
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return false;
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}
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String line = _scanner->getLine();
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CsvParsingState state = CsvParsingState::UnquotedField;
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std::vector<String> fields {""};
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size_t i = 0; // index of the current field
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for (char c : line) {
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switch (state) {
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case CsvParsingState::UnquotedField:
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switch (c) {
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case ',': // end of field
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fields.push_back(""); i++;
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break;
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case '"': state = CsvParsingState::QuotedField;
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break;
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default: fields[i] += c;
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break;
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}
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break;
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case CsvParsingState::QuotedField:
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switch (c) {
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case '"': state = CsvParsingState::QuotedQuote;
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break;
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default: fields[i] += c;
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break;
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}
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break;
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case CsvParsingState::QuotedQuote:
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switch (c) {
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case ',': // , after closing quote
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fields.push_back(""); i++;
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state = CsvParsingState::UnquotedField;
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break;
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case '"': // "" -> "
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fields[i] += '"';
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state = CsvParsingState::QuotedField;
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break;
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default: // end of quote
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state = CsvParsingState::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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_row = fields;
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return true;
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}
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