SqlNodeExtensions.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;

namespace Deveel.Data.Sql.Parser {
    public static class SqlNodeExtensions {
        public static TNode FindNode<TNode>(this ISqlNode node) where TNode : class, ISqlNode {
            var foundNode = node.FindNode(typeof(TNode));
            if (foundNode == null)
                return null;

            return (TNode)foundNode;
        }

        public static ISqlNode FindNode(this ISqlNode node, Type nodeType) {
            foreach (var childNode in node.ChildNodes) {
                if (nodeType.IsInstanceOfType(childNode))
                    return childNode;

                var foundNode = childNode.FindNode(nodeType);
                if (foundNode != null)
                    return foundNode;
            }

            return null;
        }

        public static TNode FindNodeOf<TNode>(this ISqlNode node, string nodeName) where TNode : class, ISqlNode {
            var parent = node.FindByName(nodeName);
            if (parent == null)
                return null;

            return parent.FindNode<TNode>();
        }

        public static ISqlNode FindByName(this ISqlNode node, string nodeName) {
            foreach (var childNode in node.ChildNodes) {
                if (childNode.NodeName.Equals(nodeName))
                    return childNode;

                var foundNode = childNode.FindByName(nodeName);
                if (foundNode != null)
                    return foundNode;
            }

            return null;
        }

        public static bool HasOptionalNode(this ISqlNode node, string nodeName) {
            var foundNode = node.FindByName(nodeName);
            if (foundNode == null)
                return false;

            return foundNode.ChildNodes.Any();
        }

        public static IEnumerable<TNode> FindNodes<TNode>(this ISqlNode node) where TNode : class, ISqlNode {
            var foundNodes = node.FindNodes(typeof(TNode));
            return foundNodes.Cast<TNode>();
        }

        public static IEnumerable FindNodes(this ISqlNode node, Type nodeType) {
            var nodes = new List<ISqlNode>();

            foreach (var childNode in node.ChildNodes) {
                if (nodeType.IsInstanceOfType(childNode)) {
                    nodes.Add(childNode);
                }

                nodes.AddRange(childNode.FindNodes(nodeType).Cast<ISqlNode>());
            }

            return nodes.ToArray();
        }

        public static int StartColumn(this ISqlNode node) {
            if (node == null || node.Tokens == null)
                return 0;

            var token = node.Tokens.FirstOrDefault();
            return token == null ? 0 : token.Column;
        }

        public static int EndColumn(this ISqlNode node) {
            if (node == null || node.Tokens == null)
                return 0;

            var token = node.Tokens.LastOrDefault();
            return token == null ? 0 : token.Column;            
        }

        public static int StartLine(this ISqlNode node) {
            if (node == null || node.Tokens == null)
                return 0;

            var token = node.Tokens.FirstOrDefault();
            return token == null ? 0 : token.Line;
        }

        public static int EndLine(this ISqlNode node) {
            if (node == null || node.Tokens == null)
                return 0;

            var token = node.Tokens.LastOrDefault();
            return token == null ? 0 : token.Line;
        }
    }
}