private void evaluateIfScope(AST tree)
{
Scope subscope = new Scope(Scope.ScopeType.IF_SCOPE, "<IF-SUBSCOPE>", m_currentScope);
m_currentScope = subscope;
AST_IfNode ifNode = (tree as AST_IfNode);
Debug.Assert(ifNode != null);
#if WRITE_DEBUG_INFO
Console.WriteLine("\nDefined IF-subscope for ifNode at line " + ifNode.getToken().LineNr);
#endif
ifNode.setScope(subscope); // save the new scope in the IF-token tree node
// Evaluate expression
evaluateScopeDeclarationsInAllChildren(tree.getChild(0));
AST trueNode = ifNode.getChild(1);
AST falseNode = null;
if (ifNode.getChildren().Count == 3)
{
falseNode = ifNode.getChild(2);
}
evaluateScopeDeclarationsInAllChildren(trueNode);
if (falseNode != null)
{
evaluateScopeDeclarationsInAllChildren(falseNode);
}
m_currentScope = m_currentScope.getEnclosingScope(); // pop scope
}
private void ifThenElse(AST tree)
{
// Push scope
AST_IfNode ifNode = (AST_IfNode)(tree);
Assert.IsNotNull(ifNode);
m_currentScope = (Scope)ifNode.getScope();
Assert.IsNotNull(m_currentScope);
// Evaluate conditional
ReturnValue conditionalExpression = execute(tree.getChild(0));
if (conditionalExpression.FloatValue != 0)
{
Assert.IsNotNull(tree.getChild(1));
execute(tree.getChild(1));
}
else
{
if (tree.getChildren().Count == 3)
{
Assert.IsNotNull(tree.getChild(2));
execute(tree.getChild(2));
}
}
// Pop scope
m_currentScope = (Scope)ifNode.getScope().getEnclosingScope();
Assert.IsNotNull(m_currentScope);
}
private void evaluateReferencesForIF(AST tree)
{
AST_IfNode ifNode = (AST_IfNode)(tree);
m_currentScope = (Scope)ifNode.getScope(); // push IF-subscope
evaluateReferencesInAllChildren(tree);
m_currentScope = m_currentScope.getEnclosingScope(); // pop scope
}
private AST foreachStuff()
{
AST statementList = new AST(new Token(Token.TokenType.STATEMENT_LIST, "<FOREACH_STATEMENTS>"));
// increase __index__
AST incrementNode = new AST(new Token(Token.TokenType.OPERATOR, "+"));
incrementNode.addChild(new AST(new Token(Token.TokenType.NAME, "__index__")));
incrementNode.addChild(new AST(new TokenWithValue(Token.TokenType.NUMBER, "1", new ReturnValue(1.0f))));
AST_Assignment assignmentNode = new AST_Assignment(new Token(Token.TokenType.ASSIGNMENT, "="), "__index__");
assignmentNode.addChild(incrementNode);
statementList.addChild(assignmentNode);
// if(__index__ >= count(__indexes__)) { break }
AST_FunctionCall lengthOfArray = new AST_FunctionCall(new Token(Token.TokenType.FUNCTION_CALL, "count"));
AST argumentList = new AST(new Token(Token.TokenType.NODE_GROUP, "<ARGUMENT_LIST>"));
argumentList.addChild(new Token(Token.TokenType.NAME, "__indexes__"));
lengthOfArray.addChild(argumentList);
AST breakStatement = new AST_IfNode(new Token(Token.TokenType.IF, "IF"));
AST operatorTree = new AST(new Token(Token.TokenType.OPERATOR, ">="));
operatorTree.addChild(new Token(Token.TokenType.NAME, "__index__"));
operatorTree.addChild(lengthOfArray);
breakStatement.addChild(operatorTree);
breakStatement.addChild(new Token(Token.TokenType.BREAK, "break"));
statementList.addChild(breakStatement);
// @ variable
AST_VariableDeclaration declarationTree =
new AST_VariableDeclaration(new Token(Token.TokenType.VAR_DECLARATION, "<VAR_DECL>"),
ReturnValueType.UNKNOWN_TYPE,
"@");
statementList.addChild(declarationTree);
AST arrayIndexLookup = new AST(new Token(Token.TokenType.ARRAY_LOOKUP, "__indexes__"));
arrayIndexLookup.addChild(new AST(new Token(Token.TokenType.NAME, "__index__")));
AST arrayValueLookup = new AST(new Token(Token.TokenType.ARRAY_LOOKUP, "__array__"));
arrayValueLookup.addChild(arrayIndexLookup);
AST_Assignment assignmentTree =
new AST_Assignment(new Token(Token.TokenType.ASSIGNMENT, "="), "@");
assignmentTree.addChild(arrayValueLookup);
statementList.addChild(assignmentTree);
return(statementList);
}
private AST ifThenElse()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("if block");
#endif
AST ifThenElseTree;
AST trueChild;
AST falseChild = null;
AST expr;
try {
match(Token.TokenType.IF);
expr = expression(); // child 0
match(Token.TokenType.NEW_LINE);
trueChild = statementList(false); // child 1
if (lookAheadType(1) == Token.TokenType.ELSE)
{
#if WRITE_DEBUG_INFO
Console.WriteLine("else block");
#endif
match(Token.TokenType.ELSE);
match(Token.TokenType.NEW_LINE);
falseChild = statementList(false); // child 2
match(Token.TokenType.BLOCK_END);
}
else
{
#if WRITE_DEBUG_INFO
Console.WriteLine("no else block");
#endif
match(Token.TokenType.BLOCK_END);
}
}
catch (Error e) {
// The error caught here will probably be from the match() function.
// Since that means we're missing some part of the if-statement we can give a better
// error message by throwing a new one.
throw new Error("Something is wrong with the IF-statement", Error.ErrorType.SYNTAX, e.getLineNr(), e.getLinePosition());
}
ifThenElseTree = new AST_IfNode(new Token(Token.TokenType.IF, "if", lookAhead(1).LineNr, lookAhead(1).LinePosition));
ifThenElseTree.addChild(expr);
ifThenElseTree.addChild(trueChild);
if (falseChild != null)
{
ifThenElseTree.addChild(falseChild);
}
return(ifThenElseTree);
}
private void EvaluateIf()
{
AST_IfNode ifnode = CurrentNode as AST_IfNode;
#if DEBUG
Debug.Assert(ifnode != null);
#endif
object r = PopValue();
#if DEBUG
Debug.Assert(r != null);
#endif
AST subNode = null;
if (r.GetType() != typeof(bool) && r.GetType() != typeof(float))
{
var token = ifnode.getToken();
throw new Error("Can't use value " + r + " of type " + ReturnValueConversions.PrettyObjectType(r.GetType()) + " in if-statement", Error.ErrorType.RUNTIME, token.LineNr, token.LinePosition);
}
if (ConvertToBool(r))
{
subNode = ifnode.getChild(1);
}
else
{
if (ifnode.getChildren().Count == 3)
{
subNode = ifnode.getChild(2);
}
else
{
//Console.WriteLine("There is no else-clause in statement");
}
}
if (subNode != null)
{
//Console.WriteLine("entering node");
PushNewScope(ifnode.getScope(), "IF_memorySpace" + ifCounter++, subNode);
}
else
{
//Console.WriteLine("can't enter node");
}
}
private void EvaluateIf()
{
AST_IfNode ifnode = CurrentNode as AST_IfNode;
Debug.Assert(ifnode != null);
ReturnValue r = PopValue();
Debug.Assert(r != null);
AST subNode = null;
if (r.NumberValue > 0.0f)
{
subNode = ifnode.getChild(1);
}
else
{
if (ifnode.getChildren().Count == 3)
{
subNode = ifnode.getChild(2);
}
else
{
//Console.WriteLine("There is no else-clause in statement");
}
}
if (subNode != null)
{
//Console.WriteLine("entering node");
PushNewScope(ifnode.getScope(), "IF_memorySpace" + ifCounter++, subNode);
}
else
{
//Console.WriteLine("can't enter node");
}
}
private AST ifThenElse()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("if block");
#endif
AST ifThenElseTree;
AST trueChild;
AST falseChild = null;
AST expr;
try {
Token ifToken = match(Token.TokenType.IF);
expr = expression(); // child 0
if (expr == null) {
throw new Error("The if statement is missing an expression after the 'if'", Error.ErrorType.SYNTAX, ifToken.LineNr, ifToken.LinePosition);
}
if(lookAheadType(1) == Token.TokenType.NEW_LINE) {
match(Token.TokenType.NEW_LINE);
}
else {
throw new Error("Found assignment (=) in if statement. Use == instead?", Error.ErrorType.SYNTAX, ifToken.LineNr, ifToken.LinePosition);
}
trueChild = statementList(false); // child 1
if ((lookAheadType(1) == Token.TokenType.ELSE) && (lookAheadType(2) == Token.TokenType.IF)) {
#if WRITE_DEBUG_INFO
Console.WriteLine("if else block");
#endif
match(Token.TokenType.ELSE);
var ifElseBranch = statement(); // ifThenElse();
// have to put it into a statement list to make scopes work
falseChild = new AST(new Token(Token.TokenType.STATEMENT_LIST, "<STATEMENT_LIST>"));
if(ifElseBranch != null) {
falseChild.addChild(ifElseBranch);
}
#if WRITE_DEBUG_INFO
Console.WriteLine("Popping out from ifElse branch");
#endif
}
else if (lookAheadType(1) == Token.TokenType.ELSE) {
#if WRITE_DEBUG_INFO
Console.WriteLine("else block");
#endif
match(Token.TokenType.ELSE);
if(lookAhead(1).getTokenType() == Token.TokenType.NEW_LINE) {
match(Token.TokenType.NEW_LINE);
} else {
throw new Error("The else statement is missing a line break after it", Error.ErrorType.SYNTAX, ifToken.LineNr, ifToken.LinePosition);
}
falseChild = statementList(false); // child 2
if(lookAhead(1).getTokenType() == Token.TokenType.BLOCK_END) {
match(Token.TokenType.BLOCK_END);
} else {
throw new Error("The if statement is missing a following 'end'", Error.ErrorType.SYNTAX, ifToken.LineNr, ifToken.LinePosition);
}
}
else {
#if WRITE_DEBUG_INFO
Console.WriteLine("no else block");
#endif
if(lookAhead(1).getTokenType() == Token.TokenType.BLOCK_END) {
match(Token.TokenType.BLOCK_END);
} else {
throw new Error("The if statement is missing a following 'end'", Error.ErrorType.SYNTAX, ifToken.LineNr, ifToken.LinePosition);
}
}
}
catch(Error e) {
// The error caught here will probably be from the match() function.
// Since that means we're missing some part of the if-statement we can give a better
// error message by throwing a new one.
throw e; // new Error("Something is wrong with the IF-statement", Error.ErrorType.SYNTAX, e.getLineNr(), e.getLinePosition());
}
ifThenElseTree = new AST_IfNode(new Token(Token.TokenType.IF, "if", lookAhead(1).LineNr, lookAhead(1).LinePosition));
ifThenElseTree.addChild (expr);
ifThenElseTree.addChild(trueChild);
if (falseChild != null)
{
ifThenElseTree.addChild(falseChild);
}
return ifThenElseTree;
}
private AST foreachStuff(string pLoopVariableName)
{
AST statementList = new AST(new Token(Token.TokenType.STATEMENT_LIST, "<FOREACH_STATEMENTS>"));
// increase __index__
AST incrementNode = new AST(new Token(Token.TokenType.OPERATOR, "+"));
incrementNode.addChild(new AST(new Token(Token.TokenType.NAME, "__index__")));
incrementNode.addChild(new AST(new TokenWithValue(Token.TokenType.NUMBER, "1", 1.0f)));
AST_Assignment assignmentNode = new AST_Assignment(new Token(Token.TokenType.ASSIGNMENT, "="), "__index__");
assignmentNode.addChild(incrementNode);
statementList.addChild(assignmentNode);
// if(__index__ >= count(__indexes__)) { break }
AST_FunctionCall lengthOfArray = new AST_FunctionCall(new Token(Token.TokenType.FUNCTION_CALL, "Count"));
AST argumentList = new AST(new Token(Token.TokenType.NODE_GROUP, "<ARGUMENT_LIST>"));
argumentList.addChild(new Token(Token.TokenType.NAME, "__indexes__"));
lengthOfArray.addChild(argumentList);
AST breakStatement = new AST_IfNode(new Token(Token.TokenType.IF, "IF"));
AST operatorTree = new AST(new Token(Token.TokenType.OPERATOR, ">="));
operatorTree.addChild(new Token(Token.TokenType.NAME, "__index__"));
operatorTree.addChild(lengthOfArray);
breakStatement.addChild(operatorTree);
breakStatement.addChild(new Token(Token.TokenType.BREAK, "break"));
statementList.addChild(breakStatement);
// Loop variable
AST_VariableDeclaration declarationTree =
new AST_VariableDeclaration(new Token(Token.TokenType.VAR_DECLARATION, "<VAR_DECL>"), ReturnValueType.UNKNOWN_TYPE, pLoopVariableName);
statementList.addChild(declarationTree);
AST arrayIndexLookup = new AST(new Token(Token.TokenType.ARRAY_LOOKUP, "__indexes__"));
arrayIndexLookup.addChild(new AST(new Token(Token.TokenType.NAME, "__index__")));
AST arrayValueLookup = new AST(new Token(Token.TokenType.ARRAY_LOOKUP, "__array__"));
arrayValueLookup.addChild(arrayIndexLookup);
AST_Assignment assignmentTree =
new AST_Assignment(new Token(Token.TokenType.ASSIGNMENT, "="), pLoopVariableName);
assignmentTree.addChild(arrayValueLookup);
statementList.addChild(assignmentTree);
return statementList;
}
private AST ifThenElse()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("if block");
#endif
AST ifThenElseTree;
AST trueChild;
AST falseChild = null;
AST expr;
try {
match(Token.TokenType.IF);
expr = expression(); // child 0
match(Token.TokenType.NEW_LINE);
trueChild = statementList(false); // child 1
if (lookAheadType(1) == Token.TokenType.ELSE) {
#if WRITE_DEBUG_INFO
Console.WriteLine("else block");
#endif
match(Token.TokenType.ELSE);
match(Token.TokenType.NEW_LINE);
falseChild = statementList(false); // child 2
match(Token.TokenType.BLOCK_END);
}
else {
#if WRITE_DEBUG_INFO
Console.WriteLine("no else block");
#endif
match(Token.TokenType.BLOCK_END);
}
}
catch(Error e) {
// The error caught here will probably be from the match() function.
// Since that means we're missing some part of the if-statement we can give a better
// error message by throwing a new one.
throw new Error("Something is wrong with the IF-statement", Error.ErrorType.SYNTAX, e.getLineNr(), e.getLinePosition());
}
ifThenElseTree = new AST_IfNode(new Token(Token.TokenType.IF, "if", lookAhead(1).LineNr, lookAhead(1).LinePosition));
ifThenElseTree.addChild(expr);
ifThenElseTree.addChild(trueChild);
if (falseChild != null)
{
ifThenElseTree.addChild(falseChild);
}
return ifThenElseTree;
}