Added float support

- Added float constant support to the lexer
- Added float support to the typechecker to build the correct Instruction type

Unit tests

- Added unit test for a bad example of a malformed encoded floating point to test out the lexer

source/tlang/compiler/codegen/instruction.d

@@ -95,6 +95,7 @@ public final class FetchValueVar : Value
     }
 }
 
+/* Used for integers */
 public final class LiteralValue : Value
 {
     /* Data */
@@ -110,6 +111,21 @@ public final class LiteralValue : Value
     }
 }
 
+public final class LiteralValueFloat : Value
+{
+    /* Data */
+    public double data; /* TODO: Is this best way to store? Consirring floats/doubles */
+    public byte len;
+
+    this(double data, byte len)
+    {
+        this.data = data;
+        this.len = len;
+
+        addInfo = "Data: "~to!(string)(data)~", Length: "~to!(string)(len);
+    }
+}
+
 /* FIXME: Implement this */
 /**
 * TODO: This should take in:

source/tlang/compiler/lexer.d

@@ -52,6 +52,7 @@ public final class Lexer
     private ulong position; /* Current character position */
     private char currentChar; /* Current character */
     private bool stringMode; /* Whether we are in a string "we are here" or not */
+    private bool floatMode; /* Whether or not we are building a floating point constant */
 
     /* The tokens */
     private Token[] tokens;
@@ -108,7 +109,38 @@ public final class Lexer
 
             currentChar = sourceCode[position];
 
-            if(currentChar == ' ' && !stringMode)
+            if(floatMode == true)
+            {
+                if(isDigit(currentChar))
+                {
+                    /* tack on and move to next iteration */
+                    currentToken~=currentChar;
+                    position++;
+                    column++;
+                    continue;
+                }
+                /* TODO; handle closer case and error case */
+                else
+                {
+                    /* TODO: Throw erropr here */
+                    if(isSpliter(currentChar))
+                    {
+                        floatMode = false;
+                        currentTokens ~= new Token(currentToken, line, column);
+                        currentToken = "";
+
+                        /* We just flush and catch splitter in next round, hence below is commented out */
+                        // column++;                        
+                        // position++;
+                    }
+                    else
+                    {
+                        gprintln("Floating point '"~currentToken~"' cannot be followed by a '"~currentChar~"'", DebugType.ERROR);
+                        return false;
+                    }
+                }
+            }
+            else if(currentChar == ' ' && !stringMode)
             {
                 /* TODO: Check if current token is fulled, then flush */
                 if(currentToken.length != 0)
@@ -128,8 +160,23 @@ public final class Lexer
                 gprintln("Build up: "~currentToken);
                 gprintln("Current char: "~currentChar);
 
+                
+
                 /* FIXME: Add floating point support here */
                 /* TODO: IF buildUp is all numerical and we have dot go into float mode */
+                /* TODO: Error checking will need to be added */
+                if(isNumericalStr(currentToken) && currentChar == '.')
+                {
+                    /* Tack on the dot */
+                    currentToken~=".";
+
+                    /* Enable floating point mode and go to next iteration*/
+                    floatMode = true;
+                    gprintln("Halo");
+                    column++;
+                    position++;
+                    continue;
+                }
 
 
                 /**
@@ -536,6 +583,21 @@ public final class Lexer
        
     }
 
+    private static bool isNumericalStr(string input)
+    {
+        for(ulong i = 0; i < input.length; i++)
+        {
+            char character = input[i];
+
+            if(!isDigit(character))
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
 
     /* Return the tokens */
     public Token[] getTokens()

source/tlang/compiler/typecheck/core.d

@@ -262,16 +262,39 @@ public final class TypeChecker
 
                 /**
                 * Typechecking
+                *
+                * TODO: Find the type of literal. Integer v.s. floating point
                 */
-                gprintln("NUMBER LIT");
-                addType(getType(modulle, "int"));
+                NumberLiteral numLit = cast(NumberLiteral)statement;
+                import std.string : indexOf;
+                bool isFloat = indexOf(numLit.getNumber(), ".") > -1; 
+                gprintln("NUMBER LIT: isFloat: "~to!(string)(isFloat));
+                addType(getType(modulle, isFloat ? "float" : "int"));
 
                 /**
                 * Codegen
+                *
+                * FIXME: Add support for floats
+                * TODO: We just assume (for integers) byte size 4?
                 */
-                ulong i = to!(ulong)((cast(NumberLiteral)statement).getNumber());
-                LiteralValue litValInstr = new LiteralValue(i, 4);
-                addInstr(litValInstr);
+                Value valInstr;
+
+                if(!isFloat)
+                {
+                    ulong i = to!(ulong)((cast(NumberLiteral)statement).getNumber());
+                    LiteralValue litValInstr = new LiteralValue(i, 4);
+
+                    valInstr = litValInstr;
+                }
+                else
+                {
+                    double i = to!(float)((cast(NumberLiteral)statement).getNumber());
+                    LiteralValueFloat litValInstr = new LiteralValueFloat(i, 4);
+
+                    valInstr = litValInstr;
+                }
+                
+                addInstr(valInstr);
             }
             /* String literal */
             else if(cast(StringExpression)statement)

source/tlang/testing/typecheck/simple_float_constant_bad.t

@@ -0,0 +1,4 @@
+module simple;
+
+float f1 = 1.4d;
+double f2 = 1.4f;