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Error Fixes

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- Lexer discarding all newlines (now replaces it with spaces)
- Cleanup of Type check and remove function in parser
- Cleanup in Compiler.cs
This commit is contained in:
Clemens-Dautermann 2020-08-17 23:26:53 +02:00
parent 4e4b31be3f
commit d0c844972d
8 changed files with 198 additions and 146 deletions
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3
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<state x="2182" y="199" width="432" height="650" key="com.intellij.openapi.editor.actions.MultiplePasteAction$ClipboardContentChooser" timestamp="1597510086756">
<screen x="1920" y="0" width="1920" height="1080" />
</state>
@ -291,5 +299,9 @@
<screen x="1920" y="0" width="1920" height="1080" />
</state>
<state x="1920" y="0" width="1920" height="1080" key="dock-window-2/1920.0.1920.1080/0.0.1920.1080@1920.0.1920.1080" timestamp="1597620461385" />
<state x="2543" y="239" width="672" height="678" key="search.everywhere.popup" timestamp="1597698616567">
<screen x="1920" y="0" width="1920" height="1080" />
</state>
<state x="2543" y="239" width="672" height="678" key="search.everywhere.popup/1920.0.1920.1080/0.0.1920.1080@1920.0.1920.1080" timestamp="1597698616567" />
</component>
</project>

62
Compiler/Compiler.cs
View file

@ -1,37 +1,49 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Compiler.Lexer;
using Compiler.Parser;
using Compiler.Parser.Nodes;
namespace Compiler
{
public class Compiler
public static class Compiler
{
public static void Main()
{
List<List<Token>> tokensValid = TestLexer("../../../../tests/week_1/valid");
List<List<Token>> tokensInvalid = TestLexer("../../../../tests/week_1/invalid");
string[] validFiles = Directory.GetFiles("../../../../tests/week_1/valid");
string[] invalidFiles = Directory.GetFiles("../../../../tests/week_1/invalid");
TestParser(tokensValid[0]);
TestParser(tokensInvalid[0]);
foreach (string filepath in validFiles)
{
List<Token> tokens = TestLexer(filepath, 0);
TestParser(tokens, filepath);
}
foreach (string filepath in invalidFiles)
{
List<Token> tokens = TestLexer(filepath, 0);
TestParser(tokens, filepath);
}
}
static List<List<Token>> TestLexer(String path)
static List<Token> TestLexer(string path, int debug)
{
List<List<Token>> tokenLists = new List<List<Token>>();
String[] files = Directory.GetFiles(path);
//List<List<Token>> tokenLists = new List<List<Token>>();
//string[] files = Directory.GetFiles(path);
Lexer.Lexer lexer = new Lexer.Lexer();
foreach (String filename in files)
StreamReader file = new StreamReader(path);
string contents = file.ReadToEnd();
List<Token> tokens = lexer.Lex(contents);
Console.WriteLine("Lexed \"" + path.Split("/").Last() + "\"");
if (debug > 0)
{
StreamReader file = new StreamReader(filename);
String contents = file.ReadToEnd();
List<Token> tokens = lexer.Lex(contents);
tokenLists.Add(tokens);
Console.WriteLine("-----------" + filename + "-----------");
Console.WriteLine("-----------" + path + "-----------");
foreach (Token token in tokens)
{
Console.WriteLine(token.ToString());
@ -40,14 +52,24 @@ namespace Compiler
Console.WriteLine("--------------------------------------");
}
return tokenLists;
return tokens;
}
static void TestParser(List<Token> tokenList)
static void TestParser(List<Token> tokenList, string path)
{
Parser.Parser p = new Parser.Parser();
Parser.Parser p = new Parser.Parser(tokenList);
p.Parse(ref tokenList, NodeType.ProgramNode);
try
{
Node programNode = p.Parse(NodeType.ProgramNode);
Console.WriteLine("Parsed \"" + path.Split("/").Last() + "\"");
}
catch (Exception e)
{
Console.WriteLine("Error in file \"" + path.Split("/").Last() + "\"");
Console.WriteLine(e.Message);
}
}
}
}

4
Compiler/Lexer/Lexer.cs
View file

@ -10,8 +10,8 @@ namespace Compiler.Lexer
public List<Token> Lex(String inputString)
{
//strip newlines
inputString = inputString.Replace("\n", "");
inputString = inputString.Replace("\r", "");
inputString = inputString.Replace("\n", " ");
inputString = inputString.Replace("\r", " ");
//initialize Token List
List<Token> tokens = new List<Token>();

4
Compiler/Lexer/TokenType.cs
View file

@ -13,7 +13,9 @@ namespace Compiler.Lexer
IntegerLiteralToken,
//special Token to represent invalid matches
InvalidToken
InvalidToken,
//empty toke
NullToken
}
}

15
Compiler/Parser/Exceptions/MissingTokenException.cs Normal file
View file

@ -0,0 +1,15 @@
using System;
using Compiler.Lexer;
namespace Compiler.Parser.Exceptions
{
public class MissingTokenException : Exception
{
public override string Message { get; }
public MissingTokenException(TokenType expected)
{
this.Message = "Expected Token " + expected + " missing.";
}
}
}

7
Compiler/Parser/Exceptions/UnexpectedTokenException.cs
View file

@ -5,16 +5,11 @@ namespace Compiler.Parser.Exceptions
{
public class UnexpectedTokenException : Exception
{
public TokenType expected { get; set; }
public TokenType got { get; set; }
public override string Message { get; }
public UnexpectedTokenException(TokenType expected, TokenType got)
{
this.expected = expected;
this.got = got;
this.Message = "Unexpected Token " + got + ". Expected: " + expected;
this.Message = "Unexpected Token " + got + ", expected: " + expected + ".";
}
}
}

109
Compiler/Parser/Parser.cs
View file

@ -9,11 +9,30 @@ namespace Compiler.Parser
{
public class Parser
{
public Node Parse(ref List<Token> tokenList, NodeType nodeType)
{
var t = tokenList.FirstOrDefault();
private readonly List<Token> _tokenList;
if (t == null) throw new Exception("Empty Token List.");
public Parser(List<Token> tokenList)
{
_tokenList = tokenList;
}
private void CheckFirstTokenAndRemove(TokenType expected)
{
if (_tokenList.Count == 0)
{
throw new MissingTokenException(expected);
}
if (_tokenList[0].TokenType != expected)
{
throw new UnexpectedTokenException(expected, _tokenList[0].TokenType);
}
_tokenList.RemoveAt(0);
}
public Node Parse(NodeType nodeType)
{
Node n;
switch (nodeType)
{
@ -21,32 +40,31 @@ namespace Compiler.Parser
n = new ProgramNode();
//if this node is a program node, the next one must be a function node
Node childNode = Parse(ref tokenList, NodeType.FunctionNode);
Node childNode = Parse(NodeType.FunctionNode);
n.Children.Add(childNode);
break;
case NodeType.FunctionNode:
n = new FunctionNode();
//retrieve signature and remove it
List<Token> signature = tokenList.GetRange(0, 5);
tokenList.RemoveRange(0, 5);
//check each element of the signature and raise corresponding errors
if (signature[0].TokenType != TokenType.IntToken)
CheckFirstTokenAndRemove(TokenType.IntToken);
if (_tokenList.Count == 0)
{
throw new UnexpectedTokenException(TokenType.IntToken, signature[1].TokenType);
throw new MissingTokenException(TokenType.IdentifierToken);
}
if (signature[1].Value != null)
if (_tokenList[0].Value != null)
{
if (signature[1].TokenType == TokenType.IdentifierToken)
if (_tokenList[0].TokenType == TokenType.IdentifierToken)
{
((FunctionNode) n).Name = signature[1].Value.ToString();
((FunctionNode) n).Name = _tokenList[0].Value.ToString();
}
else
{
throw new UnexpectedTokenException(TokenType.IdentifierToken, signature[1].TokenType);
throw new UnexpectedTokenException(TokenType.IdentifierToken, _tokenList[0].TokenType);
}
}
else
@ -54,64 +72,48 @@ namespace Compiler.Parser
throw new InvalidIdentifierException(null);
}
if (signature[2].TokenType != TokenType.OpenParenthesisToken)
{
throw new UnexpectedTokenException(TokenType.OpenParenthesisToken, signature[1].TokenType);
}
//remove <id>
_tokenList.RemoveAt(0);
if (signature[3].TokenType != TokenType.CloseParenthesisToken)
{
throw new UnexpectedTokenException(TokenType.CloseParenthesisToken, signature[1].TokenType);
}
if (signature[4].TokenType != TokenType.OpenBraceToken)
{
throw new UnexpectedTokenException(TokenType.OpenBraceToken, signature[1].TokenType);
}
CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken);
CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken);
CheckFirstTokenAndRemove(TokenType.OpenBraceToken);
//add returned child node to AST
n.Children.Add(Parse(ref tokenList, NodeType.StatementNode));
n.Children.Add(Parse(NodeType.StatementNode));
//remove trailing }
if (tokenList[0].TokenType != TokenType.CloseBraceToken)
{
throw new UnexpectedTokenException(TokenType.CloseBraceToken, tokenList[0].TokenType);
}
CheckFirstTokenAndRemove(TokenType.CloseBraceToken);
tokenList.RemoveAt(0);
break;
case NodeType.StatementNode:
//TODO: This Type of return/statement node will probably need fixing later
n = new ReturnNode();
//get return token and remove it
List<Token> returnStatement = tokenList.GetRange(0, 1);
tokenList.RemoveAt(0);
CheckFirstTokenAndRemove(TokenType.ReturnToken);
if (returnStatement[0].TokenType != TokenType.ReturnToken)
{
throw new UnexpectedTokenException(TokenType.ReturnToken, returnStatement[0].TokenType);
}
else
{
//add returned child node to AST
n.Children.Add(Parse(ref tokenList, NodeType.ExpressionNode));
//remove trailing ;
//add returned child node to AST
n.Children.Add(Parse(NodeType.ExpressionNode));
if (tokenList[0].TokenType != TokenType.SemicolonToken)
{
throw new UnexpectedTokenException(TokenType.SemicolonToken, tokenList[0].TokenType);
}
tokenList.RemoveAt(0);
}
//remove trailing ;
CheckFirstTokenAndRemove(TokenType.SemicolonToken);
break;
case NodeType.ExpressionNode:
Token constantToken = tokenList[0];
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
Token constantToken = _tokenList[0];
//check if TokenType is right
if (constantToken.TokenType != TokenType.IntegerLiteralToken)
{
@ -119,6 +121,9 @@ namespace Compiler.Parser
}
else
{
//remove int literal token
_tokenList.RemoveAt(0);
//check if value Type is right
if (constantToken.Value.GetType() != typeof(int))
{