package antlr;

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.cs.usfca.edu
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/antlr/GrammarAtom.java#2 $
 */

/** A GrammarAtom is either a token ref, a character ref, or string.
 * The analysis doesn't care.
 */
abstract class GrammarAtom extends AlternativeElement {
    protected String label;
    protected String atomText;
    protected int tokenType = Token.INVALID_TYPE;
    protected boolean not = false;	// ~T or ~'c' or ~"foo"
    /** Set to type of AST node to create during parse.  Defaults to what is
     *  set in the TokenSymbol.
     */
    protected String ASTNodeType = null;

    public GrammarAtom(Grammar g, Token t, int autoGenType) {
        super(g, t, autoGenType);
        atomText = t.getText();
    }

    public String getLabel() {
        return label;
    }

    public String getText() {
        return atomText;
    }

    public int getType() {
        return tokenType;
    }

    public void setLabel(String label_) {
        label = label_;
    }

    public String getASTNodeType() {
        return ASTNodeType;
    }

    public void setASTNodeType(String type) {
        ASTNodeType = type;
    }

    public void setOption(Token option, Token value) {
        if (option.getText().equals("AST")) {
            setASTNodeType(value.getText());
        }
        else {
            grammar.antlrTool.error("Invalid element option:" + option.getText(),
                               grammar.getFilename(), option.getLine(), option.getColumn());
        }
    }

    public String toString() {
        String s = " ";
        if (label != null) s += label + ":";
        if (not) s += "~";
        return s + atomText;
    }
}
