comments for parser
This commit is contained in:
Clemens-Dautermann
parent
5744b93eb1
commit
17e2f0e9e3
3 changed files with 91 additions and 73 deletions
114
Compiler/.idea/.idea.Compiler/.idea/workspace.xml
generated
114
Compiler/.idea/.idea.Compiler/.idea/workspace.xml
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@ -130,9 +104,9 @@
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@ -15,6 +15,7 @@ namespace Compiler.Parser
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_tokenList = tokenList;
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}
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//A method to check the first token in _tokenList and remove it or raise accoarding error
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private void CheckFirstTokenAndRemove(TokenType expected)
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{
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if (_tokenList.Count == 0)
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@ -30,9 +31,13 @@ namespace Compiler.Parser
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_tokenList.RemoveAt(0);
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}
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//The main RDP function
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public Node Parse(NodeType nodeType)
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{
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//declare node to be returned
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Node n;
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//switch over the nodeType to check in which part of the parser we are
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switch (nodeType)
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{
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case NodeType.ProgramNode:
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@ -110,43 +115,57 @@ namespace Compiler.Parser
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throw new MissingTokenException(TokenType.IntegerLiteralToken);
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}
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//an expression always has a first term
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//this first term is parsed here
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Node firstTerm = Parse(NodeType.TermNode);
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n = firstTerm;
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//get next token
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Token expressionToken = _tokenList[0];
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//if the next token is a + or a - it must be a binary operator because we are in an expression
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||||
//that means that this is not a plain constant but a BinaryOperator node
|
||||
while (expressionToken.TokenType == TokenType.AdditionToken ||
|
||||
expressionToken.TokenType == TokenType.NegationToken)
|
||||
{
|
||||
//remove the - or + token
|
||||
_tokenList.RemoveAt(0);
|
||||
switch (expressionToken.TokenType)
|
||||
{
|
||||
//1. create a BinOp Node
|
||||
//2. Add the first term as a child
|
||||
//3. Parse the rest as an expression and add it as the second term
|
||||
case TokenType.AdditionToken:
|
||||
n = new BinaryOperatorNode(OperatorType.Addition);
|
||||
n.Children.Add(firstTerm);
|
||||
n.Children.Add(Parse(NodeType.TermNode));
|
||||
n.Children.Add(Parse(NodeType.ExpressionNode));
|
||||
break;
|
||||
case TokenType.NegationToken:
|
||||
n = new BinaryOperatorNode(OperatorType.Subtraction);
|
||||
n.Children.Add(firstTerm);
|
||||
n.Children.Add(Parse(NodeType.TermNode));
|
||||
n.Children.Add(Parse(NodeType.ExpressionNode));
|
||||
break;
|
||||
default:
|
||||
//this should never happen because the while loop checks for token types, that are
|
||||
//handled by case statements above only
|
||||
throw new Exception("WeirdException");
|
||||
}
|
||||
|
||||
//if there are still tokens left over pop one off
|
||||
if (_tokenList.Count > 0)
|
||||
{
|
||||
expressionToken = _tokenList[0];
|
||||
}
|
||||
else
|
||||
{
|
||||
//there must be tokens left because we are in an expression.
|
||||
throw new MissingTokenException(TokenType.IntegerLiteralToken);
|
||||
}
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
//the case for term node is almost the same as the one for expression node
|
||||
case NodeType.TermNode:
|
||||
|
||||
|
||||
|
|
@ -155,11 +174,13 @@ namespace Compiler.Parser
|
|||
throw new MissingTokenException(TokenType.IntegerLiteralToken);
|
||||
}
|
||||
|
||||
//parse first factor
|
||||
Node firstFactor = Parse(NodeType.FactorNode);
|
||||
n = firstFactor;
|
||||
|
||||
Token termToken = _tokenList[0];
|
||||
|
||||
//parse second factor if it exists
|
||||
while (termToken.TokenType == TokenType.MultiplicationToken ||
|
||||
termToken.TokenType == TokenType.DivisionToken)
|
||||
{
|
||||
|
|
@ -169,13 +190,13 @@ namespace Compiler.Parser
|
|||
case TokenType.MultiplicationToken:
|
||||
n = new BinaryOperatorNode(OperatorType.Multiplication);
|
||||
n.Children.Add(firstFactor);
|
||||
n.Children.Add(Parse(NodeType.FactorNode));
|
||||
n.Children.Add(Parse(NodeType.TermNode));
|
||||
break;
|
||||
|
||||
case TokenType.DivisionToken:
|
||||
n = new BinaryOperatorNode(OperatorType.Division);
|
||||
n.Children.Add(firstFactor);
|
||||
n.Children.Add(Parse(NodeType.FactorNode));
|
||||
n.Children.Add(Parse(NodeType.TermNode));
|
||||
break;
|
||||
default:
|
||||
throw new Exception("WeirdException");
|
||||
|
|
@ -193,6 +214,7 @@ namespace Compiler.Parser
|
|||
|
||||
break;
|
||||
|
||||
|
||||
case NodeType.FactorNode:
|
||||
if (_tokenList.Count == 0)
|
||||
{
|
||||
|
|
@ -201,20 +223,31 @@ namespace Compiler.Parser
|
|||
|
||||
Token factorToken = _tokenList[0];
|
||||
|
||||
//switch over possible next tokens. There are three possible options
|
||||
|
||||
switch (factorToken.TokenType)
|
||||
{
|
||||
//first option:
|
||||
//a parenthesised expression follows.
|
||||
case TokenType.OpenParenthesisToken:
|
||||
//check and remove openParenthesis (it has already been checked in the case, so removal would be enough)
|
||||
CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken);
|
||||
//parse the things inside as an expression
|
||||
n = Parse(NodeType.ExpressionNode);
|
||||
//check if close parenthesis is supplied
|
||||
CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken);
|
||||
break;
|
||||
//second option:
|
||||
//this is a unary operator expression
|
||||
case TokenType.NegationToken:
|
||||
case TokenType.BitwiseComplementToken:
|
||||
case TokenType.LogicalNegationToken:
|
||||
//just parse this as a unary operator node
|
||||
n = Parse(NodeType.UnaryOperatorNode);
|
||||
n.Children.Add(Parse(NodeType.FactorNode));
|
||||
break;
|
||||
//this is an integer literal.
|
||||
case TokenType.IntegerLiteralToken:
|
||||
//parse it as a constant
|
||||
n = Parse(NodeType.ConstantNode);
|
||||
break;
|
||||
default:
|
||||
|
|
@ -224,6 +257,7 @@ namespace Compiler.Parser
|
|||
|
||||
break;
|
||||
|
||||
//code to parse unary operator nodes
|
||||
case NodeType.UnaryOperatorNode:
|
||||
if (_tokenList.Count == 0)
|
||||
{
|
||||
|
|
@ -231,9 +265,11 @@ namespace Compiler.Parser
|
|||
}
|
||||
else
|
||||
{
|
||||
//get operator
|
||||
Token unaryOperator = _tokenList[0];
|
||||
_tokenList.RemoveAt(0);
|
||||
|
||||
//switch over three different operators and parse the rest as an expression
|
||||
switch (unaryOperator.TokenType)
|
||||
{
|
||||
case TokenType.BitwiseComplementToken:
|
||||
|
|
@ -256,6 +292,7 @@ namespace Compiler.Parser
|
|||
|
||||
break;
|
||||
|
||||
//parse constant nodes
|
||||
case NodeType.ConstantNode:
|
||||
|
||||
if (_tokenList.Count == 0)
|
||||
|
|
@ -276,6 +313,7 @@ namespace Compiler.Parser
|
|||
break;
|
||||
}
|
||||
|
||||
//default case if the supplied NodeType is unknown
|
||||
default:
|
||||
throw new Exception("Unknown Node Type " + nodeType);
|
||||
}
|
||||
|
|
|
|||
2
grammar
2
grammar
|
|
@ -7,4 +7,4 @@
|
|||
<unary_op> ::= "!" | "~" | "-"
|
||||
|
||||
------------
|
||||
6+5+2*(3-2)+9
|
||||
6+5+2*(3-2)+~9
|
||||
Loading…
Add table
Add a link
Reference in a new issue