looqs/gui/searchworker.cpp

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#include "searchworker.h"
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#include <QRegularExpression>
#include <QDebug>
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#include <QSqlError>
#include <QStack>
SearchWorker::SearchWorker()
{
}
SearchWorker::SearchWorker(const QString &dbpath)
{
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db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName(dbpath);
if(!db.open())
{
qDebug() << "failed to open database";
}
}
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QVector<SearchWorker::Command> SearchWorker::tokenize(QString expression)
{
if(!checkParanthesis(expression))
{
throw std::invalid_argument("Invalid paranthesis");
}
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// TODO: merge lonewords
QVector<Command> result;
QRegularExpression rx("((?<filtername>(\\.|\\w)+):(?<args>\\((?<innerargs>[^\\)]+)\\)|(\\w)+)|(?<boolean>AND|OR|!)|"
"(?<bracket>\\(|\\))|(?<loneword>\\w+))");
QRegularExpressionMatchIterator i = rx.globalMatch(expression);
bool wasbool = true;
while(i.hasNext())
{
QRegularExpressionMatch m = i.next();
QString boolean = m.captured("boolean");
QString filtername = m.captured("filtername");
QString bracket = m.captured("bracket");
QString loneword = m.captured("loneword");
if(boolean != "")
{
/* if(wasbool)
{
throw new std::runtime_error("Bool after Bool is invalid");
}*/
wasbool = true;
result.append(Command(boolean));
}
if(bracket != "")
{
if(!wasbool)
{
if(bracket == "(")
{
result.append(Command("AND"));
}
}
result.append(Command(bracket));
}
if(loneword != "")
{
if(!wasbool)
{
result.append(Command("AND"));
}
wasbool = false;
result.append(Command("path.contains", loneword));
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}
if(filtername != "")
{
if(!wasbool)
{
result.append(Command("AND"));
}
wasbool = false;
QString value = m.captured("innerargs");
if(value == "")
value = m.captured("args");
result.append(Command(filtername, value));
}
}
return result;
}
QString SearchWorker::createSql(const SearchWorker::Command &cmd)
{
QString key = cmd.key;
QString value = cmd.value;
value = value.replace("'", "\\'");
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if(key == "AND" || key == "OR" || key == "(" || key == ")")
{
return " " + key + " ";
}
if(key == "!")
{
return " NOT ";
}
if(key == "path.starts")
{
return " file.path LIKE '" + value + "%' ";
}
if(key == "path.ends")
{
return " file.path LIKE '%" + value + "' ";
}
if(key == "path.contains" || key == "inpath")
{
return " file.path LIKE '%" + value + "%' ";
}
if(key == "page")
{
return " content.page = " + value;
}
if(key == "contains" || key == "c")
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{
return " content.id IN (SELECT content_fts.ROWID FROM content_fts WHERE content_fts.content MATCH '" + value +
"' )";
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}
throw std::invalid_argument("Unknown filter: " + key.toStdString());
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}
QString SearchWorker::makeSql(const QVector<SearchWorker::Command> &tokens)
{
QString result;
for(const Command &c : tokens)
{
result += createSql(c);
}
return result;
}
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bool SearchWorker::checkParanthesis(QString expression)
{
QStack<QChar> open;
QStack<QChar> close;
for(QChar &c : expression)
{
if(c == '(')
{
open.push(c);
}
if(c == ')')
{
close.push(c);
}
}
if(open.size() != close.size())
{
return false;
}
while(!open.empty() && !close.empty())
{
QChar o = open.pop();
QChar c = close.pop();
if(o != '(' && c != ')')
{
return false;
}
}
return true;
}
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void SearchWorker::search(const QString &query)
{
QSqlQuery dbquery(db);
QVector<SearchResult> results;
QString whereSql;
try
{
whereSql = makeSql(tokenize(query));
}
catch(const std::exception &e)
{
emit searchError(e.what());
return;
}
QString prep;
// TODO: hack, as we don't wanna look into content and get redundant results, when we don't even care about content
if(whereSql.contains("content."))
{
prep = "SELECT file.path AS path, content.page AS page, file.mtime AS mtime FROM file INNER JOIN content ON "
"file.id = content.fileid WHERE 1=1 AND " +
whereSql + " ORDER By file.mtime DESC, content.page ASC";
}
else
{
prep = "SELECT file.path AS path, 0 as page, file.mtime AS mtime FROM file WHERE " + whereSql +
" ORDER by file.mtime DESC";
}
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dbquery.prepare(prep);
bool success = dbquery.exec();
if(!success)
{
qDebug() << "prepped: " << prep;
qDebug() << dbquery.lastError();
emit searchError(dbquery.lastError().text());
return;
}
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while(dbquery.next())
{
SearchResult result;
result.path = dbquery.value("path").toString();
result.page = dbquery.value("page").toUInt();
result.mtime = dbquery.value("mtime").toUInt();
results.append(result);
}
emit searchResultsReady(results);
}