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package ast.nodes;
import ast.types.*;
import java.util.ArrayList;
import java.util.Arrays;
import semanticanalysis.STentry;
import semanticanalysis.SemanticError;
import semanticanalysis.SymbolTable;
/**
* Node for the `expr` statement of the grammar.
*/
public class ExprNode implements Node {
private final AtomNode atom;
private final Node compOp;
private final String op;
private final ArrayList<Node> exprs;
private final ArrayList<Node> trailers;
public ExprNode(Node atom, Node compOp, ArrayList<Node> exprs, String op, ArrayList<Node> trailers) {
this.atom = (AtomNode) atom;
this.compOp = compOp;
this.exprs = exprs;
this.op = op;
this.trailers = trailers;
}
/**
* Returns the i-th expressions of `exprs` field. If the index is greater or
* equals than the size return `null`.
*/
public Node getExpr(int i) {
if (i >= this.exprs.size()) {
return null;
}
return this.exprs.get(i);
}
/**
* Returns the identifier of the `AtomNode` if it's not `null`, otherwise
* returns `null`.
*/
public String getId() {
if (atom != null) {
return ((AtomNode) this.atom).getId();
} else {
return null;
}
}
@Override
public ArrayList<SemanticError> checkSemantics(SymbolTable ST, int _nesting) {
ArrayList<SemanticError> errors = new ArrayList<>();
// check if the atom is a function
if (atom != null && !trailers.isEmpty()) {
// check if the atom is not a built-in function
if (!Arrays.asList(bif).contains(atom.getId())) {
errors.addAll(atom.checkSemantics(ST, _nesting));
TrailerNode trailer = (TrailerNode) trailers.get(0);
String funName = atom.getId();
// TODO: it isnt a function, it could be a variable
STentry fun = ST.lookup(funName);
if (fun != null && !(fun.getType() instanceof ImportType)) {
if (!(fun.getType() instanceof FunctionType)) {
for (var t : trailers) {
errors.addAll(t.checkSemantics(ST, _nesting));
}
} else {
FunctionType ft = (FunctionType) fun.getType();
int paramNumber = ft.getParamNumber();
int argNumber = trailer.getArgumentNumber();
if (paramNumber != argNumber) {
errors.add(new SemanticError(funName + "() takes " + String.valueOf(paramNumber)
+ " positional arguments but " + String.valueOf(argNumber) + " were given."));
}
}
}
} else {
for (var trailer : trailers) {
errors.addAll(trailer.checkSemantics(ST, _nesting));
}
}
} else if (atom != null) {
errors.addAll(atom.checkSemantics(ST, _nesting));
}
if (compOp != null) {
errors.addAll(compOp.checkSemantics(ST, _nesting));
}
for (var expr : exprs) {
errors.addAll(expr.checkSemantics(ST, _nesting));
}
return errors;
}
// FIXME: type for the expr
@Override
public Type typeCheck() {
if (this.atom != null) {
return this.atom.typeCheck();
}
return new VoidType();
}
// TODO: add code generation for expr
@Override
public String codeGeneration() {
return "";
}
@Override
public String toPrint(String prefix) {
String str = prefix + "Expr\n";
prefix += " ";
if (atom != null) {
str += atom.toPrint(prefix);
}
if (compOp != null) {
str += compOp.toPrint(prefix);
}
if (exprs != null) {
for (var expr : exprs) {
str += expr.toPrint(prefix);
}
}
if (trailers != null) {
for (var trailer : trailers) {
str += trailer.toPrint(prefix);
}
}
if (op != null) {
str += prefix + "Op(" + op + ")\n";
}
return str;
}
}
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