very basic version of usql

usql/csvreader.cpp

@@ -0,0 +1,87 @@
+
+#include "csvreader.h"
+
+namespace usql {
+
+    CsvReader::CsvReader(bool skip_hdr, char field_sep, char quote_ch, char line_sep, char line_sep2) {
+	    skip_header = skip_hdr;
+	    field_separator = field_sep;
+	    quote_character = quote_ch;
+	    line_separator = line_sep;
+	    line_separator2 = line_sep2;
+
+	    header_skiped = false;
+    }
+
+    std::vector<std::vector<std::string>> CsvReader::parseCSV(const std::string &csvSource) {
+	    int linesRead = 0;
+	    bool inQuote(false);
+	    bool newLine(false);
+	    std::string field;
+
+	    std::vector<std::vector<std::string>> parsed_data;
+	    parsed_data.reserve(128);
+
+	    std::vector<std::string> line;
+	    line.reserve(32);
+
+	    std::string::const_iterator aChar = csvSource.begin();
+	    while (aChar != csvSource.end()) {
+		    if (*aChar == quote_character) {
+			    newLine = false;
+			    inQuote = !inQuote;
+		    } else if (*aChar == field_separator) {
+			    newLine = false;
+			    if (inQuote == true) {
+				    field += *aChar;
+			    } else {
+				    line.push_back(field);
+				    field.clear();
+			    }
+		    } else if (*aChar == line_separator || *aChar == line_separator2) {
+			    if (inQuote == true) {
+				    field += *aChar;
+			    } else {
+				    if (newLine == false) {
+					    line.push_back(field);
+					    add_line(line, parsed_data);
+					    field.clear();
+					    line.clear();
+					    linesRead++;
+					    if (linesRead == 16) {
+						    int linesEstimation =
+								csvSource.size() /
+								(std::distance(csvSource.begin(), aChar) / linesRead);
+						    if (linesEstimation > parsed_data.capacity())
+							    parsed_data.reserve(linesEstimation);
+					    }
+					    newLine = true;
+				    }
+			    }
+		    } else {
+			    newLine = false;
+			    field.push_back(*aChar);
+		    }
+
+		    aChar++;
+	    }
+
+	    if (field.size())
+		    line.push_back(field);
+
+	    add_line(line, parsed_data);
+
+	    return parsed_data;
+    }
+
+
+    void CsvReader::add_line(const std::vector<std::string> &line, std::vector<std::vector<std::string>> &lines) {
+	    if (skip_header && !header_skiped) {
+		    header_skiped = true;
+	    } else {
+		    if (line.size())
+			    lines.push_back(line);
+	    }
+    }
+
+}