89 lines
2.2 KiB
C++
89 lines
2.2 KiB
C++
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#include "csvreader.h"
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#include <climits>
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namespace usql {
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CsvReader::CsvReader(bool skip_hdr, char field_sep, char quote_ch, char line_sep, char line_sep2) {
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skip_header = skip_hdr;
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field_separator = field_sep;
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quote_character = quote_ch;
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line_separator = line_sep;
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line_separator2 = line_sep2;
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header_skiped = false;
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}
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std::vector<std::vector<std::string>> CsvReader::parseCSV(const std::string &csvSource) {
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int linesRead = 0;
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bool inQuote(false);
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bool newLine(false);
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std::string field;
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std::vector<std::vector<std::string>> parsed_data;
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parsed_data.reserve(128);
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std::vector<std::string> line;
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line.reserve(32);
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std::string::const_iterator aChar = csvSource.begin();
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while (aChar != csvSource.end()) {
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if (*aChar == quote_character) {
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newLine = false;
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inQuote = !inQuote;
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} else if (*aChar == field_separator) {
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newLine = false;
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if (inQuote == true) {
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field += *aChar;
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} else {
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line.push_back(field);
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field.clear();
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}
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} else if (*aChar == line_separator || *aChar == line_separator2) {
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if (inQuote == true) {
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field += *aChar;
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} else {
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if (newLine == false) {
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line.push_back(field);
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add_line(line, parsed_data);
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field.clear();
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line.clear();
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linesRead++;
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if (linesRead == 16) {
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int linesEstimation =
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csvSource.size() /
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(std::distance(csvSource.begin(), aChar) / linesRead);
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if (linesEstimation > parsed_data.capacity())
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parsed_data.reserve(linesEstimation);
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}
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newLine = true;
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}
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}
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} else {
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newLine = false;
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field.push_back(*aChar);
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}
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aChar++;
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}
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if (field.size())
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line.push_back(field);
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add_line(line, parsed_data);
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return parsed_data;
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}
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void CsvReader::add_line(const std::vector<std::string> &line, std::vector<std::vector<std::string>> &lines) {
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if (skip_header && !header_skiped) {
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header_skiped = true;
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} else {
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if (line.size())
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lines.push_back(line);
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}
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}
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}
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