public Program ParseProgram(string program)
{
var scanner = new MiniJavaScanner(new StringReader(program));
var errorLog = new ErrorLogger();
var parser = new Parser(scanner, errorLog, true);
Program ast;
if (parser.TryParse(out ast))
{
return ast;
}
return null;
}
/* Performs lexical and semantic analysis. Returns null if either phase fails.
*
* Syntax analysis is always attempted regardless of lexical errors.
* All errors are logged in the error log.
*/
private Program ConstructAbstractSyntaxTree()
{
var scanner = new MiniJavaScanner(_program);
var parser = new Parser(scanner, _errorLog);
Program program;
if (parser.TryParse(out program))
{
return program;
}
else
{
return null;
}
}
public static SemanticsChecker SetUpTypeAndReferenceChecker(string program, out IErrorReporter errorLog)
{
var reader = new StringReader(program);
var scanner = new MiniJavaScanner(reader);
var errors = new ErrorLogger();
var parser = new Parser(scanner, errors, true);
Program syntaxTree;
parser.TryParse(out syntaxTree);
reader.Close();
Assert.That(errors.Errors, Is.Empty);
var symbolTableBuilder = new SymbolTableBuilder(syntaxTree, errors);
Assert.That(errors.Errors, Is.Empty);
Assert.DoesNotThrow(() => symbolTableBuilder.BuildSymbolTable());
errorLog = new ErrorLogger();
return new SemanticsChecker(syntaxTree, errorLog);
}
private SymbolTableBuilder.ExitCode BuildSymbolTableFor(string program, out GlobalScope symbolTable)
{
var reader = new StringReader(program);
var scanner = new MiniJavaScanner(reader);
_errors = new ErrorLogger();
var parser = new Parser(scanner, _errors, true);
Program syntaxTree;
parser.TryParse(out syntaxTree);
reader.Close();
Assert.That(_errors.Errors, Is.Empty);
var symbolTableBuilder = new SymbolTableBuilder(syntaxTree, _errors);
Assert.That(_errors.Errors, Is.Empty);
var success = symbolTableBuilder.BuildSymbolTable();
symbolTable = syntaxTree.Scope as GlobalScope;
return success;
}