com.squarespace.less.parse.RulesetGuardParselet Maven / Gradle / Ivy

Go to download
/**
 * Copyright (c) 2014 SQUARESPACE, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.squarespace.less.parse;

import static com.squarespace.less.parse.Parselets.RULESET_GUARD_CONDITION;

import com.squarespace.less.LessException;
import com.squarespace.less.core.Chars;
import com.squarespace.less.model.Condition;
import com.squarespace.less.model.Guard;
import com.squarespace.less.model.Node;


public class RulesetGuardParselet implements Parselet {

  @Override
  public Node parse(LessStream stm) throws LessException {
    stm.skipWs();
    if (!stm.matchWhen()) {
      return null;
    }
    Node cond = stm.parse(RULESET_GUARD_CONDITION);
    if (cond == null) {
      return null;
    }

    Mark mark = stm.mark();
    Guard guard = new Guard();
    boolean comma = false;
    do {
      guard.add((Condition)cond);
      stm.skipWs();
      stm.mark(mark);

      comma = stm.seekIf(Chars.COMMA);
      if (!comma) {
        break;
      }

      cond = stm.parse(RULESET_GUARD_CONDITION);
    } while (cond != null);

    if (comma) {
      stm.restore(mark);
    }
    return guard;
  }


}