    001    /* Copyright 2000, 2001, Compaq Computer Corporation */
    002
    003    /* IF THIS IS A JAVA FILE, DO NOT EDIT IT!
    004
    005       Most Java files in this directory which are part of the Javafe AST
    006       are automatically generated using the astgen comment (see
    007       ESCTools/Javafe/astgen) from the input file 'hierarchy.h'.  If you
    008       wish to modify AST classes or introduce new ones, modify
    009       'hierarchy.j.'
    010     */
    011
    012    package javafe.ast;
    013
    014    import javafe.util.Assert;
    015    import javafe.util.Location;
    016    import javafe.util.ErrorSet;
    017
    018    // Convention: unless otherwise noted, integer fields named "loc" refer
    019    // to the location of the first character of the syntactic unit
    020
    021
    022    /**
    023     * Represents a SwitchLabel syntactic unit.  If expr is null, then
    024     * represents the "default" label, otherwise represents a case
    025     * label.
    026     *
    027     * <p> We infer a default: break at the end of each switch statement
    028     * that does not contain a default case to simplify translation.  Such
    029     * inferred cases will have their location equal to the location of
    030     * the closing bracket of the switch statement they are contained in.
    031     */
    032
    033    public class SwitchLabel extends Stmt
    034    {
    035      public Expr expr;
    036
    037      //@ invariant loc != javafe.util.Location.NULL;
    038      public int loc;
    039
    040      public int getStartLoc() { return loc; }
    041
    042
    043    // Generated boilerplate constructors:
    044
    045      /**
    046       * Construct a raw SwitchLabel whose class invariant(s) have not
    047       * yet been established.  It is the caller's job to
    048       * initialize the returned node's fields so that any
    049       * class invariants hold.
    050       */
    051      //@ requires I_will_establish_invariants_afterwards;
    052      protected SwitchLabel() {}    //@ nowarn Invariant,NonNullInit;
    053
    054
    055    // Generated boilerplate methods:
    056
    057      public final int childCount() {
    058         return 1;
    059      }
    060
    061      public final Object childAt(int index) {
    062              /*throws IndexOutOfBoundsException*/
    063         if (index < 0)
    064            throw new IndexOutOfBoundsException("AST child index " + index);
    065         int indexPre = index;
    066
    067         int sz;
    068
    069         if (index == 0) return this.expr;
    070         else index--;
    071
    072         throw new IndexOutOfBoundsException("AST child index " + indexPre);
    073      }   //@ nowarn Exception;
    074
    075      public final String toString() {
    076         return "[SwitchLabel"
    077            + " expr = " + this.expr
    078            + " loc = " + this.loc
    079            + "]";
    080      }
    081
    082      public final int getTag() {
    083         return TagConstants.SWITCHLABEL;
    084      }
    085
    086      public final void accept(Visitor v) { v.visitSwitchLabel(this); }
    087
    088      public final Object accept(VisitorArgResult v, Object o) {return v.visitSwitchLabel(this, o); }
    089
    090      public void check() {
    091         super.check();
    092         if (this.expr != null)
    093            this.expr.check();
    094      }
    095
    096      //@ requires loc != javafe.util.Location.NULL;
    097      //@ ensures \result != null;
    098      public static SwitchLabel make(Expr expr, int loc) {
    099         //@ set I_will_establish_invariants_afterwards = true;
    100         SwitchLabel result = new SwitchLabel();
    101         result.expr = expr;
    102         result.loc = loc;
    103         return result;
    104      }
    105    }