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mainwindow.cpp
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mainwindow.cpp
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#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindowClass()) {
ui->setupUi(this);
basic.print = [this](qint64 num) { ui->run->append(QString::number(num)); };
basic.input = [this]()->qint64 {
ui->cmd->setText("? ");
ui->cmd->setFocus();
update_tree();
qint64 value;
QEventLoop loop;
connect(this, &MainWindow::inputed, this, [&](const QString &str) { value = str.toLongLong(); loop.quit(); });
loop.exec();
disconnect(this, &MainWindow::inputed, 0, 0);
return value;
};
ui->cmd->setFocus();
ui->console->append("Qt MiniBasic Interpreter");
ui->console->append("Developer: XU Peigong email:[email protected]");
ui->console->append("Shanghai Jiao Tong University. 2023/12/08");
ui->console->append("******************************");
ui->console->append("Type \"help\" to get help about how to use it.");
ui->console->append(makeFont("lightgreen", "minibasic> "));
connect(ui->btnRun, &QPushButton::clicked, this, [this] {
ui->console->moveCursor(QTextCursor::End);
if (!basic.isRunning()) {
ui->console->insertHtml(makeFont("white", "run"));
run();
} else {
ui->console->insertHtml(makeFont("white", "kill"));
kill();
ui->console->append(makeFont("lightgreen", "minibasic> "));
}
});
connect(ui->btnLoad, &QPushButton::clicked, this, [this] {
QString filename = QFileDialog::getOpenFileName();
ui->console->moveCursor(QTextCursor::End);
ui->console->insertHtml(makeFont("white", "load " + filename));
loadCode(filename);
ui->console->append(makeFont("lightgreen", "minibasic> "));
});
connect(ui->btnClear, &QPushButton::clicked, this, [this] {
ui->console->moveCursor(QTextCursor::End);
ui->console->insertHtml(makeFont("white", "clear"));
clear();
ui->console->append(makeFont("lightgreen", "minibasic> "));
});
connect(ui->btnSave, &QPushButton::clicked, this, [this] {
QString filename = QFileDialog::getSaveFileName();
ui->console->moveCursor(QTextCursor::End);
ui->console->insertHtml(makeFont("white", "save " + filename));
saveCode(filename);
ui->console->append(makeFont("lightgreen", "minibasic> "));
});
connect(ui->cmd, &QLineEdit::returnPressed, this, &MainWindow::on_cmd_returnPressed);
}
MainWindow::~MainWindow() {
delete ui;
}
void MainWindow::update_code() {
ui->code->clear();
for (auto &line : basic.codeHTML()) { ui->code->append("<div>" + line + "</div>"); }
update_tree();
}
void MainWindow::update_tree() {
ui->tree->clear();
for (auto &line : basic.treeHTML()) { ui->tree->append("<div>" + line + "</div>"); }
}
void MainWindow::setCode(qsizetype line, const QString &code) {
if (basic.isRunning()) { kill(); }
if (line < 0) {
ui->console->append(makeFont(errorColor, "error: ") + "line number must be positive.");
return;
}
try { basic.setCode(line, code); }
catch (QString err) {
ui->console->append(makeFont(warningColor, "warning: ") + "code exists syntax error -- " + err);
}
update_code();
}
void MainWindow::removeCode(size_t line) {
if (basic.isRunning()) { kill(); }
try { basic.removeCode(line); }
catch (QString err) {
ui->console->append(makeFont(errorColor, "error: ") + err);
return;
}
update_code();
}
void MainWindow::loadCode(const QString &filename) {
if (basic.isRunning()) { kill(); }
try { basic.loadCode(filename); }
catch (QString error) {
ui->console->append(makeFont(errorColor, "error: ") + error);
return;
}
update_code();
}
void MainWindow::saveCode(const QString &filename) {
QFile *file = new QFile(filename);
if (!file->open(QIODevice::WriteOnly | QIODevice::Text)) {
ui->console->append(makeFont(errorColor, "error: ") + "no such file.");
}
QTextStream stream(file);
stream << ui->code->toPlainText();
file->close();
}
void MainWindow::clear() {
if (basic.isRunning()) { kill(); }
basic.clearCode();
ui->run->clear();
update_code();
}
void MainWindow::run() {
if (basic.isRunning()) {
ui->console->append(makeFont(warningColor, "warning: ") + "The program is running.");
ui->console->append(makeFont("lightgreen", "minibasic> "));
return;
}
ui->console->append(makeFont("lightgreen", "minibasic> "));
ui->btnRun->setStyleSheet("QPushButton {border: 0px solid white; image:url(:/MainWindow/image/kill.png);}"
"QPushButton:hover {border: 0px solid white; image:url(:/MainWindow/image/kill_hover.png);}"
"QPushButton:pressed {border: 0px solid white; image:url(:/MainWindow/image/kill_pressed.png);}");
ui->run->clear();
QString state;
try { basic.run(); }
catch (QString err) { state = err; }
if (state.isEmpty()) {
state = makeFont("lightgreen", "process exited without error.");
} else { state = makeFont(errorColor, "process exited with 1 error: ") + state; };
ui->run->append(state);
update_tree();
ui->btnRun->setStyleSheet("QPushButton {border: 0px solid white; image:url(:/MainWindow/image/run.png);}"
"QPushButton:hover {border: 0px solid white; image:url(:/MainWindow/image/run_hover.png);}"
"QPushButton:pressed {border: 0px solid white; image:url(:/MainWindow/image/run_pressed.png);}");
}
void MainWindow::kill() {
if (!basic.isRunning()) {
ui->console->append(makeFont(warningColor, "warning: ") + "The program is not running.");
return;
}
basic.kill();
emit inputed("");
ui->btnRun->setStyleSheet("QPushButton {border: 0px solid white; image:url(:/MainWindow/image/run.png);}"
"QPushButton:hover {border: 0px solid white; image:url(:/MainWindow/image/run_hover.png);}"
"QPushButton:pressed {border: 0px solid white; image:url(:/MainWindow/image/run_pressed.png);}");
ui->cmd->clear();
}
void MainWindow::help() {
ui->console->append("[line number] [code] ---insert code in some line");
ui->console->append("[line number] ---remove code in some line");
ui->console->append("r/run/RUN ---run the basic program");
ui->console->append("c/clear/CLEAR ---clear the codes");
ui->console->append("l/load/LOAD [file path] ---load a basic code file");
ui->console->append("s/save/SAVE [file path] ---save a basic code file");
ui->console->append("h/help/HELP ---get help");
ui->console->append("q/quit/QUIT ---quit this program");
}
void MainWindow::immediatelyPrint(const QString &code) {
QList<Token *> tokenList;
Expression *expression = nullptr;
qint64 value;
try { value = EvaluationState().getValue(expression = parserExpression(tokenList = scan(code))); }
catch (QPair<QList<Token *>, ScanError> scanError) {
clearTokenList(scanError.first);
ui->console->append(makeFont(errorColor, "error: ") + scanError.second.what());
return;
}
catch (ParserError parserError) {
clearTokenList(tokenList);
ui->console->append(makeFont(errorColor, "error: ") + parserError.what());
return;
}
catch (RuntimeError runtimeError) {
clearTokenList(tokenList);
delete expression;
ui->console->append(makeFont(errorColor, "error: ") + runtimeError.what());
return;
}
ui->console->append(QString::number(value));
clearTokenList(tokenList);
delete expression;
}
void MainWindow::immediatelyLet(const QString &code) {
QList<Token *> tokenList;
Statement *statement = nullptr;
try { EvaluationState().getValue(((LetStatement *)(statement = parser(tokenList = scan(code))))->expression); }
catch (QPair<QList<Token *>, ScanError> scanError) {
clearTokenList(scanError.first);
ui->console->append(makeFont(errorColor, "error: ") + scanError.second.what());
return;
}
catch (ParserError parserError) {
clearTokenList(tokenList);
ui->console->append(makeFont(errorColor, "error: ") + parserError.what());
return;
}
catch (RuntimeError runtimeError) {
clearTokenList(tokenList);
delete statement;
ui->console->append(makeFont(errorColor, "error: ") + runtimeError.what());
return;
}
clearTokenList(tokenList);
delete statement;
}
void MainWindow::immediatelyInput(const QString &code) {
QList<Token *> tokenList;
Statement *statement = nullptr;
try { statement = parser(tokenList = scan(code)); }
catch (QPair<QList<Token *>, ScanError> scanError) {
clearTokenList(scanError.first);
ui->console->append(makeFont(errorColor, "error: ") + scanError.second.what());
return;
}
catch (ParserError parserError) {
clearTokenList(tokenList);
ui->console->append(makeFont(errorColor, "error: ") + parserError.what());
return;
}
ui->cmd->setText("? ");
clearTokenList(tokenList);
delete statement;
}
void MainWindow::on_cmd_returnPressed() {
QString text = ui->cmd->text();
ui->console->moveCursor(QTextCursor::End);
ui->console->insertHtml(makeFont("white", text));
ui->cmd->clear();
text = text.trimmed();
QString cmd = text.section(' ', 0, 0);
QString str = text.section(' ', 1, -1).trimmed();
bool isNumber;
qsizetype lineList = cmd.toLongLong(&isNumber);
if (isNumber) {
if (!str.isEmpty()) {
setCode(lineList, str);
} else { removeCode(lineList); }
} else if (cmd == "clear" || cmd == "CLEAR" || cmd == "c") {
clear();
} else if (cmd == "run" || cmd == "RUN" || cmd == "r") {
run(); return;
} else if (cmd == "kill" || cmd == "KILL") {
kill();
} else if (cmd == "load" || cmd == "LOAD" || cmd == "l") {
loadCode(str);
} else if (cmd == "save" || cmd == "SAVE" || cmd == "s") {
saveCode(str);
} else if (cmd == "help" || cmd == "HELP" || cmd == "h") {
help();
} else if (cmd == "quit" || cmd == "QUIT" || cmd == "q") {
exit(0);
} else if (cmd == "PRINT") {
immediatelyPrint(str);
} else if (cmd == "LET") {
immediatelyLet(text);
} else if (cmd == "INPUT") {
immediatelyInput(text);
} else if (cmd == "?") {
emit inputed(str);
} else { ui->console->append(makeFont(errorColor, "error: ") + "illegal command."); }
ui->console->append(makeFont("lightgreen", "minibasic> "));
}