public SyntaxTree MulOper() throws java.io.IOException {
SyntaxTree syntaxTree = null;
if (token.symbol() != TokenClass.MULTOP) {
ErrorMessage.print(
"* or / expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
syntaxTree = new SyntaxTree(token.lexeme());
getToken();
return syntaxTree;
}
public SyntaxTree Literal() throws java.io.IOException {
SyntaxTree syntaxTree = null;
if (token.symbol() != TokenClass.INTEGER) {
if (token.symbol() != TokenClass.NIL) {
ErrorMessage.print("Integer expected");
} else {
syntaxTree = new SyntaxTree("NIL");
getToken();
}
} else {
syntaxTree = new SyntaxTree(token.lexeme());
getToken();
}
return syntaxTree;
}
public SyntaxTree PrefixExpr() throws java.io.IOException {
// TODO this is wrong, check further
SyntaxTree syntaxTree = null;
if (token.symbol() == TokenClass.ADDOP) {
String addop = token.lexeme();
getToken();
syntaxTree = new SyntaxTree(addop, SimpleExpr());
} else {
syntaxTree = SimpleExpr();
}
while (token.symbol() == TokenClass.PERIOD) {
syntaxTree = new SyntaxTree(".", syntaxTree, ListMethodCall());
}
return syntaxTree;
}
public SyntaxTree RelExpr() throws java.io.IOException {
SyntaxTree syntaxTree = null;
// [!] ListExpr [RelOper ListExpr]
if (token.symbol() == TokenClass.NOT) {
getToken();
syntaxTree = new SyntaxTree("NOT", ListExpr());
} else {
syntaxTree = ListExpr();
}
if (token.symbol() == TokenClass.RELOP) {
String tmpRel = token.lexeme();
getToken();
SyntaxTree tmpList = ListExpr();
syntaxTree = new SyntaxTree(tmpRel, syntaxTree, tmpList);
}
return syntaxTree;
}
public String VarDef(VariableEnvironment env) throws java.io.IOException {
String varId;
Type varType;
if (token.symbol() != TokenClass.VAR) {
ErrorMessage.print(
"Var expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.ID) {
ErrorMessage.print(
"ID expected, current token is " + token.symbol() + " with the lexeme " + token.lexeme());
}
varId = token.lexeme();
getToken();
if (token.symbol() != TokenClass.COLON) {
ErrorMessage.print(
": expected, current token is " + token.symbol() + " with the lexeme " + token.lexeme());
}
getToken();
varType = Type();
if (token.symbol() != TokenClass.ASSIGN) {
ErrorMessage.print(
"= expected, current token is " + token.symbol() + " with the lexeme " + token.lexeme());
}
getToken();
Literal();
if (token.symbol() != TokenClass.SEMICOLON) {
ErrorMessage.print(
"; expected, current token is " + token.symbol() + " with the lexeme " + token.lexeme());
}
getToken();
// TODO this needs to have the value of the var in the null spot, taken from the literal.
env.update(varId, new ExpressibleValue(varType, null));
return varId;
}
public SyntaxTree ListMethodCall() throws java.io.IOException {
SyntaxTree syntaxTree = null;
if (token.symbol() != TokenClass.PERIOD) {
ErrorMessage.print(". expected, current token is " + token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.LISTOP) {
ErrorMessage.print(
"List Operand expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
syntaxTree = new SyntaxTree(token.lexeme());
getToken();
return syntaxTree;
}
public SyntaxTree AndExpr() throws java.io.IOException {
SyntaxTree syntaxTree = null;
// RelExpr {&& RelExpr}
syntaxTree = RelExpr();
while (token.symbol() == TokenClass.AND) {
getToken();
syntaxTree = new SyntaxTree("AND", syntaxTree, RelExpr());
}
return syntaxTree;
}
public SyntaxTree Expr() throws java.io.IOException {
SyntaxTree syntaxTree = null;
// AndExpr {|| AndExpr}
syntaxTree = AndExpr();
while (token.symbol() == TokenClass.OR) {
getToken();
syntaxTree = new SyntaxTree("||", syntaxTree, AndExpr());
}
return syntaxTree;
}
public SyntaxTree AddExpr() throws java.io.IOException {
SyntaxTree syntaxTree = null;
// MulExpr {AddOper MulExpr}
syntaxTree = MulExpr();
while (token.symbol() == TokenClass.ADDOP) {
String tmpAdd = token.lexeme();
getToken();
syntaxTree = new SyntaxTree(tmpAdd, syntaxTree, MulExpr());
}
return syntaxTree;
}
public SyntaxTree ListExpr() throws java.io.IOException {
SyntaxTree syntaxTree = null;
// AddExpr | AddExpr :: ListExpr
syntaxTree = AddExpr();
if (token.symbol() == TokenClass.CONS) {
getToken();
SyntaxTree tmpList = ListExpr();
syntaxTree = new SyntaxTree("::", syntaxTree, tmpList);
}
return syntaxTree;
}
public SyntaxTree MulExpr() throws java.io.IOException {
// TODO I believe this is correct
SyntaxTree syntaxTree = null;
// PrefixExpr {MulOper PrefixExpr}
syntaxTree = PrefixExpr();
while (token.symbol() == TokenClass.MULTOP) {
String tmpOp = token.lexeme();
getToken();
syntaxTree = new SyntaxTree(tmpOp, syntaxTree, PrefixExpr());
}
return syntaxTree;
}
// compilationUnit parses MicroScala programs.
public CompEnvironment CompilationUnit() throws java.io.IOException {
CompEnvironment env;
VariableEnvironment varEnv = null;
String componentId;
// object id { {Def} MainDef }
// object
if (token.symbol() != TokenClass.OBJECT) {
ErrorMessage.print("object expected");
}
getToken();
// id
if (token.symbol() != TokenClass.ID) {
ErrorMessage.print("id expected");
}
componentId = token.lexeme();
env = new CompEnvironment(componentId);
varEnv = new VariableEnvironment(componentId);
getToken();
// {
if (token.symbol() != TokenClass.LEFTBRACE) {
ErrorMessage.print("Left Brace expected");
}
getToken();
// one or more defs
while (token.symbol() == TokenClass.DEF || token.symbol() == TokenClass.VAR) {
if (token.symbol() == TokenClass.DEF) {
Def(env);
} else {
VarDef(varEnv);
}
}
// }
if (token.symbol() != TokenClass.RIGHTBRACE) {
ErrorMessage.print("Right BRACE Expected");
}
getToken();
if (token.symbol() != TokenClass.EOF) {
ErrorMessage.print("EOF expected");
}
varEnv.print();
return env;
}
public Type Type() throws java.io.IOException {
if (token.symbol() == TokenClass.INT) {
getToken();
return Type.INT;
} else if (token.symbol() == TokenClass.LIST) {
getToken();
if (token.symbol() != TokenClass.LEFTBRACKET) {
ErrorMessage.print("[ expected");
}
getToken();
if (token.symbol() != TokenClass.INT) {
ErrorMessage.print("int expected");
}
getToken();
if (token.symbol() != TokenClass.RIGHTBRACKET) {
ErrorMessage.print("] expected");
}
getToken();
return Type.LIST;
} else {
ErrorMessage.print("Type expected");
return null;
}
}
// Def
public void Def(CompEnvironment env) throws java.io.IOException {
SyntaxTree syntaxTree = null;
String defID = "";
Type defType = null;
DefDenot defDenot;
ArrayList<String> parameterList = null;
VariableEnvironment varEnv = null;
if (token.symbol() != TokenClass.DEF) {
ErrorMessage.print(
"Def expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() == TokenClass.MAIN) {
defID = "MAIN";
varEnv = new VariableEnvironment(defID);
defType = Type.NULL;
// this is a maindef
getToken();
if (token.symbol() != TokenClass.LEFTPAREN) {
ErrorMessage.print(
"( expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
// time to get the args
parameterList = new ArrayList<String>();
if (token.symbol() != TokenClass.ARGS) {
ErrorMessage.print(
"args expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.COLON) {
ErrorMessage.print(
": expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.ARRAY) {
ErrorMessage.print(
"Array expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.LEFTBRACKET) {
ErrorMessage.print(
"[ expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.STRING) {
ErrorMessage.print(
"String expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.RIGHTBRACKET) {
ErrorMessage.print(
"] expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.RIGHTPAREN) {
ErrorMessage.print(
") expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.LEFTBRACE) {
ErrorMessage.print(
"{ expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
while (token.symbol() == TokenClass.VAR) {
VarDef(varEnv);
}
int stmtNum = 0;
do {
if (stmtNum == 0) {
syntaxTree = Statement(varEnv);
stmtNum++;
} else {
syntaxTree = new SyntaxTree(";", syntaxTree, Statement(varEnv));
}
} while (token.symbol() == TokenClass.IF
|| token.symbol() == TokenClass.WHILE
|| token.symbol() == TokenClass.ID
|| token.symbol() == TokenClass.PRINTLN
|| token.symbol() == TokenClass.LEFTBRACE);
if (token.symbol() != TokenClass.RIGHTBRACE) {
ErrorMessage.print(
"} expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
} else if (token.symbol() == TokenClass.ID) {
defID = token.lexeme();
varEnv = new VariableEnvironment(defID);
// normal def
getToken();
if (token.symbol() != TokenClass.LEFTPAREN) {
ErrorMessage.print(
"( expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
parameterList = new ArrayList<String>();
if (token.symbol() == TokenClass.ID) {
String varID = token.lexeme();
getToken();
if (token.symbol() != TokenClass.COLON) {
ErrorMessage.print(
": expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
Type varType = Type();
varEnv.update(varID, new ExpressibleValue(varType, null));
while (token.symbol() == TokenClass.COMMA) {
getToken();
if (token.symbol() != TokenClass.ID) {
ErrorMessage.print(
"ID expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
varID = token.lexeme();
getToken();
if (token.symbol() != TokenClass.COLON) {
ErrorMessage.print(
": expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
varType = Type();
varEnv.update(varID, new ExpressibleValue(varType, null));
}
if (token.symbol() != TokenClass.RIGHTPAREN) {
ErrorMessage.print(
") expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.COLON) {
ErrorMessage.print(
": expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
// TODO this is where the return value of the def is set
defType = Type();
if (token.symbol() != TokenClass.ASSIGN) {
ErrorMessage.print(
"= expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.LEFTBRACE) {
ErrorMessage.print(
"{ expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
while (token.symbol() == TokenClass.VAR) {
VarDef(varEnv);
}
int stmtNum = 0;
while (token.symbol() == TokenClass.IF
|| token.symbol() == TokenClass.WHILE
|| token.symbol() == TokenClass.ID
|| token.symbol() == TokenClass.PRINTLN
|| token.symbol() == TokenClass.LEFTBRACE) {
if (stmtNum == 0) {
syntaxTree = Statement(varEnv);
stmtNum++;
} else {
syntaxTree = new SyntaxTree(";", syntaxTree, Statement(varEnv));
stmtNum++;
}
}
if (token.symbol() != TokenClass.RETURN) {
ErrorMessage.print(
"Return expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
// TODO fix this.
syntaxTree = new SyntaxTree(";", syntaxTree, new SyntaxTree("RETURN", ListExpr()));
if (token.symbol() != TokenClass.SEMICOLON) {
ErrorMessage.print("; expected, current token is " + token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.RIGHTBRACE) {
ErrorMessage.print(
"} expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
}
} else {
varEnv = new VariableEnvironment(defID);
VarDef(varEnv);
}
defDenot = new DefDenot(parameterList, defType, varEnv, syntaxTree);
env.update(defID, defDenot);
// syntaxTree.print(defID);
System.out.println();
System.out.println();
}
public SyntaxTree SimpleExpr() throws java.io.IOException {
SyntaxTree syntaxTree = null;
if (token.symbol() == TokenClass.NIL || token.symbol() == TokenClass.INTEGER) {
syntaxTree = Literal();
} else if (token.symbol() == TokenClass.LEFTPAREN) {
// (Expr
getToken();
syntaxTree = Expr();
if (token.symbol() != TokenClass.RIGHTPAREN) {
ErrorMessage.print(
") expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
} else {
if (token.symbol() != TokenClass.ID) {
ErrorMessage.print(
"ID expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
String tmpID = token.lexeme();
syntaxTree = new SyntaxTree(token.lexeme());
getToken();
if (token.symbol() == TokenClass.LEFTPAREN) {
getToken();
// should be an optional ListExpr
SyntaxTree tmp = ListExpr();
// followed by 0 or more list expr preceded by a comma
while (token.symbol() == TokenClass.COMMA) {
getToken();
// TODO check this
tmp = new SyntaxTree(",", tmp, ListExpr());
}
if (token.symbol() != TokenClass.RIGHTPAREN) {
ErrorMessage.print(
") expected, current token is "
+ token.symbol()
+ " with the lexeme "
+ token.lexeme());
}
getToken();
syntaxTree = new SyntaxTree("APPLY", syntaxTree, tmp);
return syntaxTree;
}
}
return syntaxTree;
}
public SyntaxTree Statement(VariableEnvironment env) throws java.io.IOException {
SyntaxTree syntaxTree = null;
if (token.symbol() == TokenClass.IF) {
getToken();
if (token.symbol() != TokenClass.LEFTPAREN) {
ErrorMessage.print("( expected, current token is " + token.lexeme());
}
getToken();
SyntaxTree tmpExpr = Expr();
if (token.symbol() != TokenClass.RIGHTPAREN) {
ErrorMessage.print(") expected, current token is " + token.lexeme());
}
getToken();
SyntaxTree result1 = Statement(env);
if (token.symbol() == TokenClass.ELSE) {
getToken();
SyntaxTree result2 = Statement(env);
syntaxTree = new SyntaxTree("IF", tmpExpr, result1, result2);
} else {
syntaxTree = new SyntaxTree("IF", tmpExpr, result1);
}
} else if (token.symbol() == TokenClass.WHILE) {
getToken();
if (token.symbol() != TokenClass.LEFTPAREN) {
ErrorMessage.print("( expected, current token is " + token.lexeme());
}
getToken();
SyntaxTree tmpExpr = Expr();
if (token.symbol() != TokenClass.RIGHTPAREN) {
ErrorMessage.print(") expected, current token is " + token.lexeme());
}
getToken();
syntaxTree = new SyntaxTree("WHILE", tmpExpr, Statement(env));
} else if (token.symbol() == TokenClass.ID) {
// TODO handle this assignment statement here.
SyntaxTree tmpID = new SyntaxTree(token.lexeme());
String varID = token.lexeme();
getToken();
if (token.symbol() != TokenClass.ASSIGN) {
ErrorMessage.print("= expected, current token is " + token.lexeme());
}
getToken();
syntaxTree = new SyntaxTree("=", tmpID, ListExpr());
if (token.symbol() != TokenClass.SEMICOLON) {
ErrorMessage.print("; expected, current token is " + token.lexeme());
}
getToken();
// TODO fix this
// env.update(varID, new ExpressibleValue (Type.INT, null));
} else if (token.symbol() == TokenClass.PRINTLN) {
getToken();
if (token.symbol() != TokenClass.LEFTPAREN) {
ErrorMessage.print("( expected, current token is " + token.lexeme());
}
getToken();
SyntaxTree listExp = ListExpr();
syntaxTree = new SyntaxTree("PRINTLN", listExp);
if (token.symbol() != TokenClass.RIGHTPAREN) {
ErrorMessage.print(") expected, current token is " + token.lexeme());
}
getToken();
if (token.symbol() != TokenClass.SEMICOLON) {
ErrorMessage.print("; expected, current token is " + token.lexeme());
}
getToken();
} else if (token.symbol() == TokenClass.LEFTBRACE) {
getToken();
int stmtNum = 0;
do {
if (stmtNum == 0) {
syntaxTree = Statement(env);
stmtNum = 1;
} else {
syntaxTree = new SyntaxTree(";", syntaxTree, Statement(env));
}
} while (token.symbol() == TokenClass.IF
|| token.symbol() == TokenClass.WHILE
|| token.symbol() == TokenClass.ID
|| token.symbol() == TokenClass.PRINTLN
|| token.symbol() == TokenClass.LEFTBRACE);
if (token.symbol() != TokenClass.RIGHTBRACE) {
ErrorMessage.print("} expected, current token is " + token.lexeme());
}
getToken();
} else {
ErrorMessage.print("Statement expected, current token is " + token.lexeme());
}
return syntaxTree;
}