/* Alloy Analyzer 4 -- Copyright (c) 2006-2009, Felix Chang
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package edu.mit.csail.sdg.alloy4compiler.ast;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import edu.mit.csail.sdg.alloy4.Pos;
import edu.mit.csail.sdg.alloy4.Err;
import edu.mit.csail.sdg.alloy4.ErrorType;
import edu.mit.csail.sdg.alloy4.ErrorWarning;
import edu.mit.csail.sdg.alloy4.JoinableList;
import static edu.mit.csail.sdg.alloy4compiler.ast.Type.EMPTY;
/** Immutable; represents an illegal relation join.
*
* <p> <b>Invariant:</b> this.type==EMPTY && this.errors.size()>0
*/
public final class ExprBadJoin extends Expr {
/** The left-hand-side expression. */
public final Expr left;
/** The right-hand-side expression. */
public final Expr right;
/** Caches the span() result. */
private Pos span=null;
/** {@inheritDoc} */
@Override public Pos span() {
Pos p=span;
if (p==null) span = (p = pos.merge(closingBracket).merge(right.span()).merge(left.span()));
return p;
}
/** {@inheritDoc} */
@Override public void toString(StringBuilder out, int indent) {
if (indent<0) {
left.toString(out,-1);
out.append('.');
right.toString(out,-1);
} else {
for(int i=0; i<indent; i++) { out.append(' '); }
out.append("ExprBadJoin:\n");
left.toString(out, indent+2);
right.toString(out, indent+2);
}
}
/** Constructs an ExprBadJoin node. */
private ExprBadJoin(Pos pos, Pos closingBracket, Expr left, Expr right, JoinableList<Err> errors) {
super(pos, closingBracket, (left.ambiguous || right.ambiguous), EMPTY, 0, 0, errors);
this.left=left;
this.right=right;
}
/** Constructs an ExprBadJoin node. */
public static Expr make(Pos pos, Pos closingBracket, Expr left, Expr right) {
JoinableList<Err> errors = left.errors.make(right.errors);
if (errors.isEmpty()) {
StringBuilder sb=new StringBuilder("This cannot be a legal relational join where\nleft hand side is ");
left.toString(sb,-1);
sb.append(" (type = ").append(left.type).append(")\nright hand side is ");
right.toString(sb,-1);
sb.append(" (type = ").append(right.type).append(")\n");
errors = errors.make(new ErrorType(pos, sb.toString()));
}
return new ExprBadJoin(pos, closingBracket, left, right, errors);
}
/** {@inheritDoc} */
public int getDepth() {
int a=left.getDepth(), b=right.getDepth();
if (a>=b) return 1+a; else return 1+b;
}
/** {@inheritDoc} */
@Override public Expr resolve(Type t, Collection<ErrorWarning> warns) { return this; }
/** {@inheritDoc} */
@Override public final<T> T accept(VisitReturn<T> visitor) throws Err { return visitor.visit(this); }
/** {@inheritDoc} */
@Override public String getHTML() { return "<b>error</b> (parser or typechecker failed)"; }
/** {@inheritDoc} */
@Override public List<? extends Browsable> getSubnodes() { return new ArrayList<Browsable>(0); }
}