/**
* Relational pipes
* Copyright © 2018 František Kučera (Frantovo.cz, GlobalCode.info)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <cstdlib>
#include <vector>
#include <memory>
#include <regex>
#include <algorithm>
#include <unistd.h>
#include <relpipe/writer/RelationalWriter.h>
#include <relpipe/writer/RelpipeWriterException.h>
#include <relpipe/writer/AttributeMetadata.h>
#include <relpipe/writer/Factory.h>
#include <relpipe/writer/TypeId.h>
#include <relpipe/cli/CLI.h>
using namespace std;
using namespace relpipe::cli;
using namespace relpipe::writer;
bool readValue(istream& input, stringstream& currentValue, bool& lastInRecord) {
lastInRecord = false;
char ch;
input.get(ch);
if (ch == '"') {
while (input.get(ch)) {
if (ch == '"') {
input.get(ch);
if (ch == '"') {
currentValue << ch;
} else {
if (ch == '\r') input.get(ch);
if (ch == '\n') lastInRecord = true;
else if (ch != ',') throw RelpipeWriterException(L"Unexpected character (should be „\\n“ or „,“)");
return true;
}
} else {
currentValue << ch;
}
}
} else if (ch == ',') {
return true;
} else if (ch == '\n') {
lastInRecord = true;
return true;
} else if (ch == '\r') {
input.get(ch);
if (ch == '\n') {
lastInRecord = true;
return true;
} else {
throw RelpipeWriterException(L"Crazy carriage stuck during journey");
}
} else {
for (currentValue << ch; input.get(ch);) {
switch (ch) {
case ',': return true;
case '\r': break;
case '\n':
lastInRecord = true;
return true;
default: currentValue << ch;
}
}
}
return false;
}
void processDataStream(ostream &output, istream& input, const vector<string_t>& args) {
wstring_convert < codecvt_utf8<wchar_t>> convertor; // UTF-8 is required for CSV
std::shared_ptr<RelationalWriter> writer(Factory::create(output));
vector<AttributeMetadata> metadata;
bool headerDone = false;
bool lastInRecord = false;
stringstream currentValue;
while (readValue(input, currentValue, lastInRecord) && input.good()) {
if (headerDone) {
writer->writeAttribute(convertor.from_bytes(currentValue.str()));
} else {
AttributeMetadata am;
am.attributeName = convertor.from_bytes(currentValue.str());
am.typeId = TypeId::STRING;
metadata.push_back(am);
if (lastInRecord) {
/*
* Usage (simple syntax):
* relpipe-in-csv → default relation name, attribute names on the first line, all types are string
* relpipe-in-csv my_relation → custom relation name
* relpipe-in-csv my_relation a b c → custom relation name, custom attribute names (a,b,c), first line contains data
* relpipe-in-csv my_relation a integer b string c boolean → custom relation name, custom attribute names (a,b,c), custom types (integer,string,boolean), first line contains data
*/
vector<string_t> firstLine;
if (args.size() == (1 + metadata.size())) {
for (int i = 0; i < metadata.size(); i++) {
firstLine.push_back(metadata[i].attributeName);
metadata[i].attributeName = args[1 + i];
}
} else if (args.size() == (1 + 2 * metadata.size())) {
for (int i = 0; i < metadata.size(); i++) {
firstLine.push_back(metadata[i].attributeName);
metadata[i].attributeName = args[1 + i * 2];
metadata[i].typeId = writer->toTypeId(args[1 + i * 2 + 1]);
}
}
headerDone = true;
writer->startRelation(args.size() > 0 ? args[0] : L"csv", metadata, true);
if (firstLine.size()) {
for (string_t value : firstLine) writer->writeAttribute(value);
}
}
}
currentValue.str("");
currentValue.clear();
}
}
int main(int argc, char** argv) {
setlocale(LC_ALL, "");
CLI::untieStdIO();
CLI cli(argc, argv);
int resultCode = CLI::EXIT_CODE_UNEXPECTED_ERROR;
try {
processDataStream(cout, cin, cli.arguments());
resultCode = CLI::EXIT_CODE_SUCCESS;
} catch (RelpipeWriterException e) {
fwprintf(stderr, L"Caught Writer exception: %ls\n", e.getMessge().c_str());
fwprintf(stderr, L"Debug: Input stream: eof=%ls, lastRead=%d\n", (cin.eof() ? L"true" : L"false"), cin.gcount());
resultCode = CLI::EXIT_CODE_DATA_ERROR;
}
return resultCode;
}