Adds support for TEXT type. Is passed as const char * to C/C++.

README.md

@@ -12,7 +12,6 @@ Also it leaks memory. A lot of memory.
 - Fixing Memory Leaks
 - Adding support for Modules
 - Adding support for Pointer Types
-- Adding support for String Type
 
 ## Guidlines
 - Calls to `die` or `die_extra` should follow the following scheme: `ContextName.ErrorName`

scripts/main.ts

@@ -4,9 +4,11 @@ VAR global : INT;
 # OBJ heap        : "/sys/malloc";
 # OBJ interrupts  : "/sys/interrupt";
 
-PUB main() | i : INT
+PUB main() | i : INT, str : TEXT
 BEGIN
 	0 -> i;
+	"Hello " -> str;
+	printStr(str + "World!");
 	WHILE ((i + 1) -> i) <= fun() DO
 	BEGIN
 		hlp(i, fun() - i);

src/vm.cpp

@@ -85,8 +85,13 @@ Variable NativeMethod::invoke(Vector<Variable> arguments)
 		if(arguments[i].type() != this->parameters[i]) {
 			die_extra("NativeMethod.InvalidArgumentType", arguments[i].type().name());
 		}
+		// Special case TEXT: Copy const char * instead of object
+		if(arguments[i].type() == Type::Text) {
+			stackSize += sizeof(const char *);
+		} else {
 			stackSize += arguments[i].type().size();
 		}
+	}
 
 	uint8_t *stack = (uint8_t*)malloc(stackSize);
 	uint8_t *stackPtr = stack;
@@ -95,11 +100,20 @@ Variable NativeMethod::invoke(Vector<Variable> arguments)
 		size_t size = arguments[i].type().size();
 		void *data = arguments[i].data();
 
+		if(arguments[i].type() == Type::Text) {
+			// Copy const char *
+			const char *text = arguments[i].value<Text>();
+
+			memcpy(stackPtr, &text, sizeof(const char *));
+			stackPtr += sizeof(const char *);
+		}
+		else {
 			if(size > 0) {
 				memcpy(stackPtr, data, size);
 				stackPtr += size;
 			}
 		}
+	}
 
 	dynamic_call(this->function, stack, stackSize);
 
@@ -116,6 +130,10 @@ extern "C" void __cdecl print2Int(int a, int b) {
 	kprintf("{%d;%d}\n", a, b);
 }
 
+extern "C" void __cdecl printStr(const char *text) {
+	kprintf("{%s}", text);
+}
+
 struct NativeModuleDef
 {
 	const char *name;
@@ -128,6 +146,7 @@ NativeModuleDef methods[] = {
 	{ "timer_get", "", (void*)timer_get },
 	{ "timer_set", "i", (void*)timer_set },
 	{ "printInt", "i", (void*)printInt },
+	{ "printStr", "t", (void*)printStr },
 	{ "print2Int", "ii", (void*)print2Int },
 	{ nullptr, nullptr, 0 }
 };

trainscript/trainscript.l

@@ -9,6 +9,9 @@
 %option reentrant
 %option bison-bridge
 %option yylineno
+
+%x strparse
+
 %%
 \#[^\n]*        ; // Eat all the comments!
 [ \t]+          ; // Eat all the whitespace!
@@ -56,6 +59,11 @@ TO              { return KW_TO; }
 UNTIL           { return KW_UNTIL; }
 WHILE           { return KW_WHILE; }
 DO              { return KW_DO; }
+
+"\""			BEGIN(strparse);
+<strparse>[^\"]* { yylval->text = yyextra->strdup(yytext); return TEXT;  }
+<strparse>"\""	BEGIN(INITIAL);
+
 [0-9]+\.[0-9]*  { yylval->fval = atof(yytext); return REAL; }
 [0-9]+          { yylval->ival = atoi(yytext); return INT; }
 [a-zA-Z0-9'_]+  { yylval->text = yyextra->strdup(yytext); return IDENTIFIER; }

trainscript/trainscript.y

@@ -66,6 +66,7 @@ void yyerror(void *scanner, const char *s);
 %token <fval> REAL
 %token <ival> INT
 %token <text> IDENTIFIER
+%token <text> TEXT
 
 %token KW_PUB
 %token KW_PRI
@@ -319,7 +320,7 @@ elseIfLoop:
 expression:
 	INT                                         { $$ = new ConstantExpression(Variable::fromInt($1)); }
 |	REAL                                        { $$ = new ConstantExpression(Variable::fromReal($1)); }
-// |   TEXT                                     { $$ = new ConstantExpression(Variable::fromText($1)); }
+|   TEXT                                        { $$ = new ConstantExpression(Variable::fromText($1)); }
 |   IDENTIFIER                                  { $$ = new VariableExpression($1); }
 |   IDENTIFIER LBRACKET expressionList RBRACKET {
 		auto *call = new MethodInvokeExpression($1);