1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 * 

    14 * Description:

    15 *

    16 */

    17 using System;

    18 using System.Collections.Generic;

    19 using System.Text;

    20 using System.Text.RegularExpressions;

    21 using System.Reflection;

    22 using SymbianParserLib.Elements;

    23 using SymbianParserLib.Enums;

    24 

    25 namespace SymbianParserLib.RegExTranslators.Types

    26 {

    27     internal class RegExTranslatorDecimal : RegExTranslatorBase

    28     {

    29         #region Constructors

    30         public RegExTranslatorDecimal()

    31         {

    32         }

    33         #endregion

    34 

    35         #region API

    36         public override ParserField Process( Capture aCapture, int aStartAt, ParserLine aLine )

    37         {

    38             ParserField ret = null;

    39             //

    40             RegExTranslatorExtractionInfo m = new RegExTranslatorExtractionInfo( aLine.OriginalValue, aStartAt );

    41             //

    42             if ( m.Success && ( m.ValueTypeChar == 'D' || m.ValueTypeChar == 'I' || m.ValueTypeChar == 'U' ) )

    43             {

    44                 bool requiresNumberedCaptureGroup = true;

    45 

    46                 // Build the regular expression

    47                 StringBuilder regex = new StringBuilder( "[0-9]" );

    48                 if ( m.Width != RegExTranslatorExtractionInfo.KNoWidthSpecified )

    49                 {

    50                     // (?(\b[ 0-9+-]{4}\b:)(?:[ ]{0,3}([+-]?[0-9]{1,4}):))

    51                     int width = m.Width;

    52                     string padChar = m.PadChar;

    53 

    54                     // This becomes very complex now. We must match the pad character

    55                     regex = new StringBuilder();

    56 

    57                     // Start a conditional group

    58                     regex.Append( "(?" );

    59 

    60                     // Start the if-statement match. The idea here is to perform a first pass

    61                     // that matches any numbers, signs (-/+) and pad characters without any

    62                     // care about the ordering. The length, however, is critical.

    63                     regex.AppendFormat( "([{0}0-9+-]{{1}})", padChar, width );

    64 

    65                     // If the match above is true, then we'll execute this 'yes' case. The

    66                     // idea now is to pull out the specific value, ignoring the padding.

    67 

    68                     // We start a non-capturing group. This is the beginning of the value we

    69                     // need, but we don't want to capture the padding (although we validate it

    70                     // exists).

    71                     regex.AppendFormat( "(?:" );

    72                     if ( padChar != string.Empty )

    73                     {

    74                         // We must allow for width-1 pad characters.

    75                         regex.AppendFormat( "[{0}]", padChar );

    76                         regex.Append( "{0," );

    77                         regex.Append( width );

    78                         regex.Append( "}" );

    79                     }

    80 

    81                     // We must now allow for a plus/minus sign. We do this within

    82                     // a numbered group, since this is the bit we're eventually interested in.

    83                     regex.Append( "(" );

    84                     regex.Append( "[+-]?[0-9]" );

    85                     regex.Append( "{1," + width + "}" );

    86                     regex.Append( ")" );

    87 

    88                     // End non-capturing group

    89                     regex.Append( ")" );

    90 

    91                     // End conditional group

    92                     regex.Append( ")" );

    93 

    94                     // We explicitly managed this ourselves

    95                     requiresNumberedCaptureGroup = false;

    96                 }

    97                 else

    98                 {

    99                     // Add "one or more" suffix

   100                     regex.Append( "+" );

   101                 }

   102 

   103                 ret = CreateField( regex.ToString(), m.Name, m.ValueType, m.CapturePos, m.CaptureLength, requiresNumberedCaptureGroup );

   104             }

   105             //

   106             return ret;

   107         }

   108         #endregion

   109 

   110         #region Properties

   111         #endregion

   112 

   113         #region Internal methods

   114         #endregion

   115 

   116         #region Internal constants

   117         #endregion

   118 

   119         #region From System.Object

   120         public override string ToString()

   121         {

   122             return base.ToString();

   123         }

   124         #endregion

   125 

   126         #region Data members

   127         #endregion

   128     }

   129 }