@Override
public Node parse(Token token) throws IOException {
AttrNode node = null;
if (ExpressionParser.START.contains(token.type())) {
node = new AttrNode(startLine());
token = tokenizer().peek();
Token var = tokenizer().current();
if (ATTR.contains(token.type())) {
boolean first = true;
while (ATTR.contains(token.type())) {
Node n = null;
if (tokenizer().peek().type() == TokenType.LEFT_PAREN) {
CallParser call = new CallParser(this);
n = call.parse(var);
} else if (ExpressionParser.START.contains(var.type())) {
if (first) {
n = ParseUtil.value(var);
first = false;
} else {
n = ParseUtil.var(var);
}
} else {
error(ErrorCode.INVALID_EXPR);
}
if (n != null) {
node.add(n);
token = tokenizer().next();
if (ATTR.contains(token.type())) {
var = tokenizer().next();
}
}
}
} else if (tokenizer().current().type() == TokenType.LEFT_BRACKET) {
ArrayParser arrp = new ArrayParser(this);
Node n = arrp.parse(tokenizer().current());
node.add(n);
} else {
node.add(ParseUtil.value(tokenizer().current()));
tokenizer().next();
}
} else {
error(ErrorCode.INVALID_EXPR);
}
return node;
}
private ICodeNode parseIdentifier(Token token) throws Exception {
ICodeNode rootNode = null;
// Look up the identifier in the symbol table stack.
// Flag the identifier as undefined if it's not found.
String name = token.getText().toLowerCase();
SymTabEntry id = symTabStack.lookup(name);
// Undefined.
if (id == null) {
errorHandler.flag(token, IDENTIFIER_UNDEFINED, this);
id = symTabStack.enterLocal(name);
id.setDefinition(UNDEFINED);
id.setTypeSpec(Predefined.undefinedType);
}
Definition defnCode = id.getDefinition();
switch ((DefinitionImpl) defnCode) {
case CONSTANT:
{
Object value = id.getAttribute(CONSTANT_VALUE);
TypeSpec type = id.getTypeSpec();
if (value instanceof Integer) {
rootNode = ICodeFactory.createICodeNode(INTEGER_CONSTANT);
rootNode.setAttribute(VALUE, value);
} else if (value instanceof Float) {
rootNode = ICodeFactory.createICodeNode(REAL_CONSTANT);
rootNode.setAttribute(VALUE, value);
} else if (value instanceof String) {
rootNode = ICodeFactory.createICodeNode(STRING_CONSTANT);
rootNode.setAttribute(VALUE, value);
}
id.appendLineNumber(token.getLineNumber());
token = nextToken(); // consume the constant identifier
if (rootNode != null) {
rootNode.setTypeSpec(type);
}
break;
}
case ENUMERATION_CONSTANT:
{
Object value = id.getAttribute(CONSTANT_VALUE);
TypeSpec type = id.getTypeSpec();
rootNode = ICodeFactory.createICodeNode(INTEGER_CONSTANT);
rootNode.setAttribute(VALUE, value);
id.appendLineNumber(token.getLineNumber());
token = nextToken(); // consume the enum constant identifier
rootNode.setTypeSpec(type);
break;
}
case FUNCTION:
{
CallParser callParser = new CallParser(this);
rootNode = callParser.parse(token);
break;
}
default:
{
VariableParser variableParser = new VariableParser(this);
rootNode = variableParser.parse(token, id);
break;
}
}
return rootNode;
}