1 files changed, 0 insertions, 179 deletions
diff --git a/code/Interpreter2/src/Interpreter/TokenScanner.java b/code/Interpreter2/src/Interpreter/TokenScanner.java
deleted file mode 100644
index c9249a4..0000000
--- a/code/Interpreter2/src/Interpreter/TokenScanner.java
+++ /dev/null
@@ -1,179 +0,0 @@
-package Interpreter;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-public class TokenScanner {
-    private String sourceCode;
-    List<Token> tokens = new ArrayList<>();
-    private int tokenStart=0;
-    private int currentLoc=0;
-
-    //Extract tokens from the source code by reading character by character
-    List<Token> extractTokens(String sourceCode){
-        this.sourceCode=sourceCode;
-        while (!checkEOF()){
-            tokenStart=currentLoc;
-            readToken();
-        }
-        tokens.add(new Token(TokenType.EOF, "", null));
-        return tokens;
-    }
-
-    //Extract a single token
-    private void readToken(){
-        char checkChar = sourceCode.charAt(currentLoc);
-        switch(checkChar){
-
-            case ' ':break;
-            case '\n':break;
-            case '\r':break;
-            case '\t':
-                break;
-
-            case '(': createTokenNull(TokenType.LEFT_PAREN); break;
-            case ')': createTokenNull(TokenType.RIGHT_PAREN); break;
-            case '+': createTokenNull(TokenType.PLUS); break;
-            case '-': createTokenNull(TokenType.MINUS); break;
-            case '*': createTokenNull(TokenType.STAR); break;
-            case '/': createTokenNull(TokenType.SLASH); break;
-            case ';': createTokenNull(TokenType.SEMI_COLON); break;
-
-            //Some tokens are multiple characters long (==, <=) etc
-            //so need to check next char as well
-            case '=': 
-                if (checkNextChar('=')){
-                    createTokenNull(TokenType.EQUALITY);
-                    break;
-                } else {
-                    createTokenNull(TokenType.EQUALS);
-                    break;
-                }
-            case ':': 
-                if (checkNextChar(':')){
-                    createTokenNull(TokenType.DEFINE);
-                    break;
-                } else {
-                    createTokenNull(TokenType.COLON);
-                    break;
-                }
-            case '<': 
-                if (checkNextChar('=')){
-                    createTokenNull(TokenType.LESS_EQUAL);
-                    break;
-                } else {
-                    createTokenNull(TokenType.LESS);
-                    break;
-                }
-            case '>': 
-                if (checkNextChar('=')){
-                    createTokenNull(TokenType.GREATER_EQUAL);
-                    break;
-                } else {
-                    createTokenNull(TokenType.GREATER);
-                    break;
-                }
-            default:
-
-                //Check for numer
-                if (checkIsDigit(checkChar)){
-                    while (checkIsDigit(lookAhead())){
-                        currentLoc++;
-                    }   
-                    //Check if number contains a decimal point
-                    if (lookAhead()=='.' && checkIsDigit(lookTwoAhead())){
-                        currentLoc++;
-                        while (checkIsDigit(lookAhead())){
-                            currentLoc++;
-                        }
-                    }
-                    createToken(TokenType.NUMBER, Double.parseDouble(sourceCode.substring(tokenStart, currentLoc+1)));
-                }
-                else if (checkIsAlpha(checkChar)){
-                    while (checkIsAlpha(lookAhead())){
-                        currentLoc++;
-                    } 
-                    String text = sourceCode.substring(tokenStart, currentLoc+1);
-                    TokenType type = keywords.get(text);
-                    if(type == null){
-                        createToken(TokenType.IDENTIFIER, text);
-                    } else{
-                        createToken(type, text);
-                    }
-
-                } else {
-                    Language.displayError("Unexpected Character");
-                }
-        }
-        currentLoc++;
-
-    }
-
-    //Test for end of file
-    private boolean checkEOF(){
-        return currentLoc>=sourceCode.length();
-    }
-
-    //Create a token without a value
-    private void createTokenNull(TokenType type){
-        createToken(type, null);
-    }
-
-    //Create token
-    private void createToken(TokenType type, Object value){
-        String tokenText = sourceCode.substring(tokenStart, currentLoc+1);
-        tokens.add(new Token(type, tokenText, value));
-    }
-
-    //Check if the next char matches a given char
-    private boolean checkNextChar(char matchChar){
-        if (checkEOF()){
-            return false;
-        }
-        if (sourceCode.charAt(currentLoc+1)==matchChar){
-            currentLoc++;
-            return true;
-        } 
-        return false;
-    }
-
-    //Look at the next char in the source code
-    private char lookAhead(){
-        if (currentLoc+1>=sourceCode.length()){
-            return ' ';
-
-        } else {
-            return sourceCode.charAt(currentLoc+1);
-        }
-    }
-
-    //Look 2 chars ahead in the source code
-    private char lookTwoAhead(){
-        if (currentLoc+2>=sourceCode.length()){
-            return ' ';
-
-        } else {
-            return sourceCode.charAt(currentLoc+2);
-        }
-    }
-
-    //Check if a given char is a digit
-    private boolean checkIsDigit(char checkChar){
-        return checkChar>='0' && checkChar<='9';
-    }
-
-    private boolean checkIsAlpha(char checkChar){
-        return ('a'<=checkChar && checkChar<='z')||
-               ('A'<=checkChar && checkChar<='Z');
-    }
-
-    private static final Map<String, TokenType> keywords;
-
-    static {
-        keywords = new HashMap<>();
-        keywords.put("var",    TokenType.VAR);
-        keywords.put("print",    TokenType.PRINT);
-      }
-}