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 * We represent [C.]this. 024 * 025 * <p> classPrefix holds C if present, and null otherwise. 026 * 027 * @note classPrefix will hold a <em>**TypeSig**</em> instead of a 028 * TypeName if we have been inferred. (The inferred field specifies 029 * whether or not we have been inferred.) 030 */ 031 032 public class ThisExpr extends Expr 033 { 034 public Type classPrefix; 035 036 037 //@ invariant loc != javafe.util.Location.NULL; 038 public int loc; 039 040 041 //* Were we inferred by the disambiguation code? 042 public boolean inferred = false; 043 044 public int getStartLoc() { 045 if (classPrefix != null && classPrefix instanceof TypeName) 046 return classPrefix.getStartLoc(); 047 return loc; 048 } 049 050 public int getEndLoc() { return Location.inc(loc, 3); } 051 052 053 // Generated boilerplate constructors: 054 055 /** 056 * Construct a raw ThisExpr whose class invariant(s) have not 057 * yet been established. It is the caller's job to 058 * initialize the returned node's fields so that any 059 * class invariants hold. 060 */ 061 //@ requires I_will_establish_invariants_afterwards; 062 protected ThisExpr() {} //@ nowarn Invariant,NonNullInit; 063 064 065 // Generated boilerplate methods: 066 067 public final int childCount() { 068 return 1; 069 } 070 071 public final Object childAt(int index) { 072 /*throws IndexOutOfBoundsException*/ 073 if (index < 0) 074 throw new IndexOutOfBoundsException("AST child index " + index); 075 int indexPre = index; 076 077 int sz; 078 079 if (index == 0) return this.classPrefix; 080 else index--; 081 082 throw new IndexOutOfBoundsException("AST child index " + indexPre); 083 } //@ nowarn Exception; 084 085 public final String toString() { 086 return "[ThisExpr" 087 + " classPrefix = " + this.classPrefix 088 + " loc = " + this.loc 089 + "]"; 090 } 091 092 public final int getTag() { 093 return TagConstants.THISEXPR; 094 } 095 096 public final void accept(Visitor v) { v.visitThisExpr(this); } 097 098 public final Object accept(VisitorArgResult v, Object o) {return v.visitThisExpr(this, o); } 099 100 public void check() { 101 super.check(); 102 if (this.classPrefix != null) 103 this.classPrefix.check(); 104 } 105 106 //@ requires loc != javafe.util.Location.NULL; 107 //@ ensures \result != null; 108 public static ThisExpr make(Type classPrefix, int loc) { 109 //@ set I_will_establish_invariants_afterwards = true; 110 ThisExpr result = new ThisExpr(); 111 result.classPrefix = classPrefix; 112 result.loc = loc; 113 return result; 114 } 115 }