/* JavaCCOptions:MULTI=true,NODE_USES_PARSER=true,VISITOR=false,TRACK_TOKENS=false,NODE_PREFIX=AST,NODE_EXTENDS=,NODE_FACTORY=,SUPPORT_CLASS_VISIBILITY_PUBLIC=true */

/*

* © Copyright FOCONIS AG, 2014

*

* 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.

*/

* Implements the {@literal @}For function

*

*/

  public ASTAtFor(final AtFormulaParserImpl p, final int id) {

    super(p, id);

  }

  /**

   * Error handling is a little bit complexer, as we must return the Error-ValueHolders of init/condition/increment if one of them fail

   */

  @Override

  public ValueHolder evaluate(final FormulaContext ctx) throws FormulaReturnException {

    Node init = children[0];

    Node condition = children[1];

    Node increment = children[2];

    ValueHolder vh = init.evaluate(ctx);

    if (vh.dataType == DataType.ERROR)

      return vh;

    while (true) {

      vh = condition.evaluate(ctx);

      if (vh.dataType == DataType.ERROR)

        return vh;

      if (!vh.isTrue(ctx))

        break;

      // execute statements

      for (int i = 3; i < children.length; ++i) {

        children[i].evaluate(ctx);

      }

      vh = increment.evaluate(ctx);

      if (vh.dataType == DataType.ERROR)

        return vh;

    }

    return ctx.TRUE; // returns always TRUE

  }

  /*

   * (non-Javadoc)

   * @see org.openntf.formula.ast.SimpleNode#analyzeThis(java.util.Set, java.util.Set, java.util.Set, java.util.Set)

   */

  @Override

  protected void analyzeThis(final Set<String> readFields, final Set<String> modifiedFields, final Set<String> variables,

      final Set<String> functions) {

    functions.add("@for");

  }

}