package org.jruby.ir.operands;
import org.jruby.RubyBasicObject;
import org.jruby.RubyString;
import org.jruby.ir.IRVisitor;
import org.jruby.ir.transformations.inlining.InlinerInfo;
import org.jruby.runtime.DynamicScope;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
// This represents a backtick string in Ruby
// Ex: `ls .`; `cp #{src} #{dst}`
//
// NOTE: This operand is only used in the initial stages of optimization.
// Further down the line, this string operand could get converted to calls
public class BacktickString extends Operand {
final public List<Operand> pieces;
public BacktickString(Operand val) {
pieces = new ArrayList<Operand>();
pieces.add(val);
}
public BacktickString(List<Operand> pieces) {
this.pieces = pieces;
}
@Override
public boolean hasKnownValue() {
for (Operand o : pieces) {
if (!o.hasKnownValue()) return false;
}
return true;
}
@Override
public Operand getSimplifiedOperand(Map<Operand, Operand> valueMap, boolean force) {
List<Operand> newPieces = new ArrayList<Operand>();
for (Operand p : pieces) {
newPieces.add(p.getSimplifiedOperand(valueMap, force));
}
return new BacktickString(newPieces);
}
/** Append the list of variables used in this operand to the input list */
@Override
public void addUsedVariables(List<Variable> l) {
for (Operand o : pieces) {
o.addUsedVariables(l);
}
}
@Override
public Operand cloneForInlining(InlinerInfo ii) {
if (hasKnownValue()) return this;
List<Operand> newPieces = new ArrayList<Operand>();
for (Operand p : pieces) {
newPieces.add(p.cloneForInlining(ii));
}
return new BacktickString(newPieces);
}
@Override
public Object retrieve(ThreadContext context, IRubyObject self, DynamicScope currDynScope, Object[] temp) {
RubyString newString = context.runtime.newString();
for (Operand p: pieces) {
RubyBasicObject piece = (RubyBasicObject) p.retrieve(context, self, currDynScope, temp);
newString.append((piece instanceof RubyString) ? (RubyString) piece : piece.to_s());
}
return self.callMethod(context, "`", newString);
}
@Override
public void visit(IRVisitor visitor) {
visitor.BacktickString(this);
}
@Override
public String toString() {
return "`" + (pieces == null ? "[]" : pieces) + "`";
}
}