/**
* This constructor is used when VARDECL is a STMT. We get the ID and the type, ensure that it is
* a valid type, and add it to its parent body's vartable.
*
* @param b the parent body
* @param c the Code object
*/
public VARDECL(BODY b, Code c) {
body = b;
code = c.currentLine();
lineNum = c.currentLineNum();
String[] tokens = Code.tokenize(code);
type = tokens[1];
// Ensure that the type is int, string or bool.
if (!Terminals.dataTypes.contains(type))
Interpreter.error(
"VARDECL", lineNum, code, "Invalid VARDECL data type. Must be int, string, or bool");
if (type.equals(Terminals.VOID))
Interpreter.error(
"VARDECL", lineNum, code, "Invalid VARDECL data type. Must be int, string, or bool");
// Get the ID
id = ID.validate(tokens[2], c);
if (tokens[tokens.length - 1] != Terminals.SEMICOLON) {
Interpreter.error("VARDECL", lineNum, code, "Missing semicolon");
}
// Add to the varTable of the parent body
body.varTable.add(this);
}
/**
* Ensure that the var doesn't exist twice in the same varTable (it can exist in different
* varTables)
*/
public void validate() {
Interpreter.writeln("validate", "Validating VARDECL");
if (Collections.frequency(body.varTable, Interpreter.findVar(body, id)) > 1) {
Interpreter.error(
"VARDECL", lineNum, code, "Var " + id + " cannot be declared more than once!");
}
}
/** Simple print function */
public void print() {
if (id != null && type != null) {
Interpreter.write("parse", "vardecl " + type + " " + id);
} else Interpreter.write("parse", "Empty VARDECL");
}
/** This is a special print function we use for printing the variable tables. */
public void printVar() {
if (id != null && type != null) {
Interpreter.write("debug", type + " " + id);
} else Interpreter.write("debug", "Empty VARDECL");
}