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package ast.nodes;
import ast.types.*;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import semanticanalysis.SemanticError;
import semanticanalysis.SymbolTable;
/**
* Node for the `atom` statement of the grammar.
*/
public class AtomNode implements Node {
protected String val;
public AtomNode(String val) {
this.val = val;
}
public String getId() {
return this.val;
}
@Override
public ArrayList<SemanticError> checkSemantics(SymbolTable ST, int _nesting) {
var errors = new ArrayList<SemanticError>();
if ((this.typeCheck() instanceof AtomType) && ST.nslookup(this.getId()) < 0) {
errors.add(new SemanticError("'" + this.getId() + "' is not defined."));
}
return errors;
}
// ENHANCE: return more specific types
@Override
public Type typeCheck() {
Pattern booleanVariable = Pattern.compile("^(True|False)$");
Pattern continueBreakVariable = Pattern.compile("^(continue|break)$");
// this regex should match every possible atom name written in this format: CHAR (CHAR | DIGIT)*
Pattern simpleVariable = Pattern.compile("^[a-zA-Z][a-zA-Z0-9]*$", Pattern.CASE_INSENSITIVE);
Matcher booleanVariableMatcher = booleanVariable.matcher(this.val);
Matcher continueBreakVariableMatcher = continueBreakVariable.matcher(this.val);
Matcher simpleVariableMatcher = simpleVariable.matcher(this.val);
boolean matchFoundBoolean = booleanVariableMatcher.find();
boolean matchFoundContinueBreak = continueBreakVariableMatcher.find();
boolean matchFoundSimpleVariable = simpleVariableMatcher.find();
if (matchFoundBoolean) {
return new BoolType();
} else if (matchFoundContinueBreak) {
return new ContinueBreakType();
} else if (matchFoundSimpleVariable) {
return new AtomType(); // could be a variable or a fuction
} else {
return new VoidType(); // could be any type of data
}
}
// TODO: add code generation for atom node
@Override
public String codeGeneration() {
return "";
}
@Override
public String toPrint(String prefix) {
if (val != null) {
return prefix + "Atom(" + val + ")\n";
}
return prefix + "Atom(null)\n";
}
}
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