    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 escjava.ast;
    013
    014    import java.util.Hashtable;
    015    import java.util.Set;
    016    import java.util.ArrayList;
    017
    018    import javafe.ast.*;
    019    import javafe.util.Assert;
    020    import javafe.util.Location;
    021    import escjava.ParsedRoutineSpecs;
    022
    023    // Convention: unless otherwise noted, integer fields named "loc" refer
    024    // to the location of the first character of the syntactic unit
    025
    026    //# TagBase javafe.tc.TagConstants.LAST_TAG + 1
    027    //# VisitorRoot javafe.ast.Visitor
    028
    029
    030    public class LabelExpr extends GCExpr
    031    {
    032      public boolean positive;
    033
    034      public /*@ non_null @*/ Identifier label;
    035
    036      public /*@ non_null @*/ Expr expr;
    037
    038
    039
    040    // Generated boilerplate constructors:
    041
    042      /**
    043       * Construct a raw LabelExpr whose class invariant(s) have not
    044       * yet been established.  It is the caller's job to
    045       * initialize the returned node's fields so that any
    046       * class invariants hold.
    047       */
    048      //@ requires I_will_establish_invariants_afterwards;
    049      protected LabelExpr() {}    //@ nowarn Invariant,NonNullInit;
    050
    051
    052    // Generated boilerplate methods:
    053
    054      public final int childCount() {
    055         return 2;
    056      }
    057
    058      public final Object childAt(int index) {
    059              /*throws IndexOutOfBoundsException*/
    060         if (index < 0)
    061            throw new IndexOutOfBoundsException("AST child index " + index);
    062         int indexPre = index;
    063
    064         int sz;
    065
    066         if (index == 0) return this.label;
    067         else index--;
    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 "[LabelExpr"
    077            + " sloc = " + this.sloc
    078            + " eloc = " + this.eloc
    079            + " positive = " + this.positive
    080            + " label = " + this.label
    081            + " expr = " + this.expr
    082            + "]";
    083      }
    084
    085      public final int getTag() {
    086         return TagConstants.LABELEXPR;
    087      }
    088
    089      public final void accept(javafe.ast.Visitor v) {
    090        if (v instanceof Visitor) ((Visitor)v).visitLabelExpr(this);
    091      }
    092
    093      public final Object accept(javafe.ast.VisitorArgResult v, Object o) {
    094        if (v instanceof VisitorArgResult) return ((VisitorArgResult)v).visitLabelExpr(this, o); else return null;
    095      }
    096
    097      public void check() {
    098         super.check();
    099         this.label.check();
    100         this.expr.check();
    101      }
    102
    103      //@ ensures \result != null;
    104      public static LabelExpr make(int sloc, int eloc, boolean positive, /*@ non_null @*/ Identifier label, /*@ non_null @*/ Expr expr) {
    105         //@ set I_will_establish_invariants_afterwards = true;
    106         LabelExpr result = new LabelExpr();
    107         result.sloc = sloc;
    108         result.eloc = eloc;
    109         result.positive = positive;
    110         result.label = label;
    111         result.expr = expr;
    112         return result;
    113      }
    114    }