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#include <pch.hpp>
#include "variables.h"
#include "stream.h"
#include "definedColumns.h"
#include "rowProcessor.h"
#include "textReader.h"
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/trim.hpp>
class RowProcessor;
/// Base class for Project2 components that create a row set based on the contents of a byte stream
class StreamNvpRows : public RowSet {
public:
class ParseState : public RowState {
public:
typedef boost::function<bool (size_t start)> Process;
class Token {
public:
Token(const Glib::ustring cs, Process p) :
chars(cs),
process(p)
{
}
bool operator<(const Token & other) const {
return (other.chars.length() < this->chars.length() ||
(other.chars.length() == this->chars.length() && this->chars < other.chars));
}
const Glib::ustring chars;
const Process process;
mutable size_t firstMatch;
};
ParseState(const StreamNvpRows * rows, ExecContext * e, const RowProcessorCallback & proc) :
sr(rows),
rp(proc),
ec(e),
inQuotes(false),
inValue(false),
prevWasQuote(false)
{
tokens.insert(Token(sr->newline, boost::bind(&StreamNvpRows::ParseState::newRecord, this, _1)));
tokens.insert(Token(sr->assign, boost::bind(&StreamNvpRows::ParseState::newField, this, _1)));
tokens.insert(Token(sr->fieldSep, boost::bind(&StreamNvpRows::ParseState::newValue, this, _1)));
if (!sr->quoteChar.empty()) {
tokens.insert(Token(sr->quoteChar, boost::bind(&StreamNvpRows::ParseState::quote, this, _1)));
}
}
~ParseState()
{
if (!std::uncaught_exception()) {
newRecord(tok.length());
}
}
const Columns & getColumns() const {
return columns;
}
void pushChar(gunichar c)
{
tok += c;
if (inQuotes) {
if (boost::algorithm::ends_with(tok, sr->quoteChar)) {
quote(tok.length() - sr->quoteChar.length());
}
else {
prevWasQuote = false;
}
}
else {
if (tok.length() >= tokens.begin()->chars.length()) {
for (auto & t : tokens) {
t.firstMatch = tok.rfind(t.chars);
if (t.firstMatch < tok.length() - tokens.begin()->chars.length()) {
t.firstMatch = -1;
}
}
Tokens::const_iterator t = std::min_element(tokens.begin(), tokens.end(),
[](const Token & a, const Token & b) { return a.firstMatch < b.firstMatch; });
if (t->firstMatch != (size_t)-1) {
if (t->process(t->firstMatch)) {
tok = tok.substr(t->firstMatch + t->chars.length());
}
}
}
}
}
private:
bool newRecord(size_t start) {
if (start > 0) {
if (inValue) {
newValue(start);
}
else {
newField(start);
}
}
if (!columns.empty()) {
process(ec, rp);
}
fields.clear();
columns.clear();
return true;
}
bool newField(size_t start) {
columns.insert(new Column(columns.size(),
boost::algorithm::trim_copy_if(tok.substr(0, start), g_unichar_isspace)));
fields.push_back(Null());
inValue = true;
return true;
}
bool newValue(size_t start) {
fields.back() = VariableType::make(boost::algorithm::trim_copy_if(tok.substr(0, start), g_unichar_isspace));
inValue = false;
return true;
}
bool quote(size_t start) {
if (prevWasQuote) {
prevWasQuote = false;
inQuotes = !inQuotes;
}
else {
prevWasQuote = inQuotes;
inQuotes = !inQuotes;
tok.erase(start, sr->quoteChar.length());
}
return false;
}
const StreamNvpRows * sr;
const RowProcessorCallback & rp;
ExecContext * ec;
bool inQuotes;
bool inValue;
bool prevWasQuote;
Glib::ustring tok;
mutable Columns columns;
typedef std::set<Token> Tokens;
Tokens tokens;
};
StreamNvpRows(ScriptNodePtr p) :
RowSet(p),
fieldSep(p->value("fieldSep", ",", NULL).as<Glib::ustring>()),
quoteChar(p->value("quoteChar", "\"", NULL).as<Glib::ustring>()),
keepBlankRows(p->value("keepBlankRows", false, NULL)),
countBlankRows(p->value("countBlankRows", false, NULL)),
newline(p->value("newline", "\n", NULL).as<Glib::ustring>()),
assign(p->value("assign", "=", NULL).as<Glib::ustring>()),
encoding(p->value("encoding", "utf-8", NULL).as<std::string>())
{
p->script->loader.addLoadTarget(p, Storer::into<ElementLoader>(&stream));
}
void execute(const Glib::ustring &, const RowProcessorCallback & rp, ExecContext * ec) const
{
ParseState ps(this, ec, rp);
TextReader::CharSink cs = boost::bind(&StreamNvpRows::ParseState::pushChar, &ps, _1);
TextReader t(encoding.c_str());
stream->runStream(boost::bind(&TextReader::read, &t, _1, _2, cs), ec);
}
private:
StreamPtr stream;
const Glib::ustring fieldSep;
const Glib::ustring quoteChar;
const bool keepBlankRows;
const bool countBlankRows;
const Glib::ustring newline;
const Glib::ustring assign;
const std::string encoding;
};
DECLARE_LOADER("streamnvprows", StreamNvpRows);
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