private static boolean rule_assignment(DefaultMutableTreeNode parent) {
boolean error = false;
DefaultMutableTreeNode node;
String iden = tokens.get(currentToken).getWord();
node =
new DefaultMutableTreeNode("identifier" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
String s = tokens.get(currentToken).getWord();
if (SemanticAnalyzer.getSymbolTable().get(s) != null)
SemanticAnalyzer.pushStack(SemanticAnalyzer.getSymbolTable().get(s).firstElement().getType());
else {
SemanticAnalyzer.pushStack("ERROR");
SemanticAnalyzer.error(getgui(), 0, getlineno(), s);
}
currentToken++;
if (currentToken < tokens.size() && tokens.get(currentToken).getWord().equals("=")) {
node = new DefaultMutableTreeNode("=");
parent.add(node);
currentToken++;
} else {
error(5);
while (currentToken < tokens.size()
&& !(tokens.get(currentToken).getWord().equals("!")
|| tokens.get(currentToken).getWord().equals("-")
|| tokens.get(currentToken).getToken().equals("INTEGER")
|| tokens.get(currentToken).getToken().equals("OCTAL")
|| tokens.get(currentToken).getToken().equals("HEXADECIMAL")
|| tokens.get(currentToken).getToken().equals("BINARY")
|| tokens.get(currentToken).getToken().equals("STRING")
|| tokens.get(currentToken).getToken().equals("CHARACTER")
|| tokens.get(currentToken).getToken().equals("FLOAT")
|| tokens.get(currentToken).getToken().equals("IDENTIFIER")
|| tokens.get(currentToken).getWord().equals("true")
|| tokens.get(currentToken).getWord().equals("false")
|| tokens.get(currentToken).getWord().equals("(")
|| tokens.get(currentToken).getWord().equals(")")
|| tokens.get(currentToken).getWord().equals(";"))) {
currentToken++;
}
}
node = new DefaultMutableTreeNode("expression");
parent.add(node);
error = rule_expression(node);
String s1 = SemanticAnalyzer.popStack();
String s2 = SemanticAnalyzer.popStack();
String operator = "=";
String res = SemanticAnalyzer.calculateCube(s1, s2, operator);
CodeGenerator.addInstruction("STO", iden, "0");
if (res.equals("ERROR")) SemanticAnalyzer.error(getgui(), 2, getlineno(), "");
return error;
}
public static DefaultMutableTreeNode run(Vector<Token> t, Gui gui) {
Parser.gui = gui;
tokens = t;
currentToken = 0;
root = new DefaultMutableTreeNode("program");
//
rule_program(root);
CodeGenerator.addInstruction("OPR", "0", "0");
//
gui.writeSymbolTable(SemanticAnalyzer.getSymbolTable());
CodeGenerator.writeCode(gui);
SemanticAnalyzer.getSymbolTable().clear();
SemanticAnalyzer.getStack().clear();
CodeGenerator.clear(gui);
return root;
}
/**
* Run
*
* @param Vector<Token> t, Gui gui
* @return DefaultMutableTreeNode
*/
public static DefaultMutableTreeNode run(Vector<A2.Token> t, Gui gui) {
Parser.gui = gui;
tokens = t;
currentToken = 0;
SemanticAnalyzer.reset(); // reset the data structures
root = new DefaultMutableTreeNode("program");
rule_program(root);
gui.writeSymbolTable(SemanticAnalyzer.getSymbolTable());
return root;
}
private static boolean rule_C(DefaultMutableTreeNode parent) {
boolean error = false;
DefaultMutableTreeNode node;
if (currentToken < tokens.size() && tokens.get(currentToken).getToken().equals("INTEGER")) {
node = new DefaultMutableTreeNode("integer" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("int");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getToken().equals("OCTAL")) {
node = new DefaultMutableTreeNode("octal" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("int");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getToken().equals("HEXADECIMAL")) {
node =
new DefaultMutableTreeNode(
"hexadecimal" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("int");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getToken().equals("BINARY")) {
node = new DefaultMutableTreeNode("binary" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("int");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getToken().equals("STRING")) {
node = new DefaultMutableTreeNode("string" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("string");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getToken().equals("CHARACTER")) {
node =
new DefaultMutableTreeNode("character" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("char");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getToken().equals("FLOAT")) {
node = new DefaultMutableTreeNode("float" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("float");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getWord().equalsIgnoreCase("true")) {
node = new DefaultMutableTreeNode("boolean" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("boolean");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size() && tokens.get(currentToken).getWord().equals("false")) {
node = new DefaultMutableTreeNode("boolean" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
SemanticAnalyzer.pushStack("boolean");
CodeGenerator.addInstruction("LIT", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size()
&& tokens.get(currentToken).getToken().equals("IDENTIFIER")) {
node =
new DefaultMutableTreeNode("identifier" + "(" + tokens.get(currentToken).getWord() + ")");
parent.add(node);
if (SemanticAnalyzer.getSymbolTable().get(tokens.get(currentToken).getWord()) != null)
SemanticAnalyzer.pushStack(
SemanticAnalyzer.getSymbolTable()
.get(tokens.get(currentToken).getWord())
.firstElement()
.getType());
else {
SemanticAnalyzer.error(getgui(), 0, getlineno(), tokens.get(currentToken).getWord());
SemanticAnalyzer.pushStack("ERROR");
}
CodeGenerator.addInstruction("LOD", tokens.get(currentToken).getWord(), "0");
currentToken++;
} else if (currentToken < tokens.size() && tokens.get(currentToken).getWord().equals("(")) {
node = new DefaultMutableTreeNode("(");
parent.add(node);
currentToken++;
//
node = new DefaultMutableTreeNode("expression");
parent.add(node);
error = rule_expression(node);
//
if (currentToken < tokens.size() && tokens.get(currentToken).getWord().equals(")")) {
node = new DefaultMutableTreeNode(")");
parent.add(node);
currentToken++;
} else error(7);
} else {
error(9);
}
return false;
}
