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#include <cstdlib>
#include <string>
#include <sstream>
#include <vector>
#include <algorithm>
#include "CSVParser.h"
#include "Exception.h"
#include "ParserFactory.h"
using namespace std;
CSVParser CSVParser::instance {};
CSVParser::CSVParser() {
ParserFactory::register_strategy(this);
}
unsigned int CSVParser::heuristic(FileReader & f) {
const string content = f.read();
int global_columns = 0;
int columns = 1;
int rows = 0;
int penalty = 1;
for (char c : content) {
if (c == ',') columns++;
if (c == '\n') {
rows++;
if (global_columns == 0) global_columns = columns;
penalty += abs(global_columns - columns);
columns = 1;
}
}
if (global_columns == 1) penalty += 1000;
return (rows + global_columns) / penalty;
}
static size_t header_idx(vector<string> header, string field) {
auto iter = find(header.begin(), header.end(), field);
if (iter == header.end())
throw Exception("CSV file is missing \"%s\" column", field.c_str());
return iter - header.begin();
}
void CSVParser::parse(FileReader & f, MuseumDeserializer & d) {
vector<vector<string>> table = {};
istringstream rows(f.read());
string row;
while (getline(rows, row)) {
// ignore windows line endings
if (row.back() == '\r') row.pop_back();
istringstream columns(row);
string column;
vector<string> table_row = {};
while (getline(columns, column, ',')) {
table_row.push_back(column);
}
table.push_back(table_row);
}
if (table.size() < 1)
throw Exception("not enough data rows in CSV file");
vector<string> table_header = table[0];
table.erase(table.begin());
size_t x_idx = header_idx(table_header, "x");
size_t y_idx = header_idx(table_header, "y");
size_t vx_idx = header_idx(table_header, "vx");
size_t vy_idx = header_idx(table_header, "vy");
for (vector<string> row : table) {
d.add_artist({
.x = stof(row[x_idx]),
.y = stof(row[y_idx]),
.vx = stof(row[vx_idx]),
.vy = stof(row[vy_idx]),
});
}
}
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