package org.jruby.ir.instructions;
import org.jruby.RubyBasicObject;
import org.jruby.RubyString;
import org.jruby.ir.IRVisitor;
import org.jruby.ir.Operation;
import org.jruby.ir.operands.Operand;
import org.jruby.ir.operands.Variable;
import org.jruby.ir.transformations.inlining.CloneInfo;
import org.jruby.parser.StaticScope;
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 BacktickInstr extends Instr implements ResultInstr {
private Variable result;
private List<Operand> pieces;
public BacktickInstr(Variable result, Operand val) {
super(Operation.BACKTICK_STRING);
this.result = result;
pieces = new ArrayList<Operand>();
pieces.add(val);
}
public BacktickInstr(Variable result, List<Operand> pieces) {
super(Operation.BACKTICK_STRING);
this.result = result;
this.pieces = pieces;
}
@Override
public Variable getResult() {
return result;
}
public List<Operand> getPieces() {
return pieces;
}
@Override
public void updateResult(Variable v) {
this.result = v;
}
@Override
public Operand[] getOperands() {
return pieces.toArray(new Operand[pieces.size()]);
}
@Override
public void simplifyOperands(Map<Operand, Operand> valueMap, boolean force) {
List<Operand> newPieces = new ArrayList<Operand>();
for (Operand p : pieces) {
newPieces.add(p.getSimplifiedOperand(valueMap, force));
}
pieces = newPieces;
}
@Override
public Instr clone(CloneInfo ii) {
List<Operand> newPieces = new ArrayList<Operand>();
for (Operand p : pieces) {
newPieces.add(p.cloneForInlining(ii));
}
return new BacktickInstr(ii.getRenamedVariable(result), newPieces);
}
@Override
public Object interpret(ThreadContext context, StaticScope currScope, DynamicScope currDynScope, IRubyObject self, Object[] temp) {
RubyString newString = context.runtime.newString();
for (Operand p: pieces) {
RubyBasicObject piece = (RubyBasicObject) p.retrieve(context, self, currScope, currDynScope, temp);
newString.append((piece instanceof RubyString) ? (RubyString) piece : piece.to_s());
}
newString.setFrozen(true);
return self.callMethod(context, "`", newString);
}
@Override
public void visit(IRVisitor visitor) {
visitor.BacktickInstr(this);
}
@Override
public String toString() {
return result + " = `" + (pieces == null ? "[]" : pieces) + "`";
}
}