PythonExpressionFinder.cs :  » IDEs » MonoDevelop » PyBinding » Parser » C# / CSharp Open Source

// PythonExpressionFinder.cs
// 
// Copyright (c) 2009 Christian Hergert <chris@dronelabs.com>
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Text;

using MonoDevelop.Projects.Dom;
using MonoDevelop.Projects.Dom.Parser;

namespace PyBinding.Parser{
  public class PythonExpressionFinder: IExpressionFinder
  {
//    ProjectDom m_dom;

    public PythonExpressionFinder (ProjectDom dom)
    {
//      m_dom = dom;
    }
    
    #region IExpressionFinder implementation
    bool IExpressionFinder.IsExpression (string text)
    {
      return true;
    }
    
    ExpressionResult IExpressionFinder.FindExpression (string text, int offset)
    {
      int begin, typebegin;
      var word = GetWordAtOffset (text, offset, out begin);
      var type = GetWordAtOffset (text, begin, out typebegin);
      
//      Console.WriteLine ("Expression word: {0}", word);
//      Console.WriteLine ("Expression type: {0}", type);
      
      return new PythonExpressionResult (word, type);
    }
    
    ExpressionResult IExpressionFinder.FindFullExpression (string text, int offset)
    {
      throw new System.NotImplementedException();
    }
    #endregion
    
    string GetWordAtOffset (string text, int offset, out int begin)
    {
      if (offset < 0 || offset >= text.Length)
      {
        begin = offset;
        return String.Empty;
      }
      
      StringBuilder sb = new StringBuilder ();
      int i = offset;
      char c;
      
      // Look forward for break char
      for (i = offset; i < text.Length; i++)
      {
        c = text [i];
        
        if (Char.IsWhiteSpace (c))
          break;
        
        bool needsBreak = false;
        
        switch (c) {
        case '(':
        case ')':
        case '[':
        case ']':
        case '{':
        case '}':
        case ':':
        case ',':
        case '@':
        case '.':
          needsBreak = true;
          break;
        default:
          sb.Append (c);
          break;
        }
        
        if (Char.IsWhiteSpace (c) || needsBreak)
          break;
      }
      
      if (offset > 0)
      {
        // look backwards for break char
        for (i = offset - 1; i > 0; i--)
        {
          c = text [i];
          
          if (Char.IsWhiteSpace (c))
            break;
          
          bool needsBreak = false;
          
          switch (c) {
          case '(':
          case ')':
          case '[':
          case ']':
          case '{':
          case '}':
          case ':':
          case ',':
          case '@':
          case '.':
            needsBreak = true;
            break;
          default:
            sb.Insert (0, c);
            break;
          }
          
          if (needsBreak)
            break;
        }
      }
      
      begin = i;
      
      return sb.ToString ();
    }
  }
  
  public class PythonExpressionResult: ExpressionResult
  {
    public string Word {
      get;
      set;
    }
    
    public string Type {
      get;
      set;
    }
    
    public PythonExpressionResult (string word, string type) : base (word)
    {
      Word = word;
      Type = type;
    }
  }
}