/* 
Date: 08\23\2010 - Ludvik Jerabek - Initial Release
Version: 1.0
Comment: Allow INI manipulation in .NET
License: CPOL

Revisions:

08\23\2010 - Ludvik Jerabek - Initial Release
11\12\2010 - Ludvik Jerabek - Fixed section regex matching on key values with brackets
06\20\2015 - Ludvik Jerabek - Fixed key parsing regex to account for keys with spaces in names


**DISCLAIMER**
THIS MATERIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING, BUT Not LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, OR NON-INFRINGEMENT. SOME JURISDICTIONS DO NOT ALLOW THE
EXCLUSION OF IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT
APPLY TO YOU. IN NO EVENT WILL I BE LIABLE TO ANY PARTY FOR ANY
DIRECT, INDIRECT, SPECIAL OR OTHER CONSEQUENTIAL DAMAGES FOR ANY
USE OF THIS MATERIAL INCLUDING, WITHOUT LIMITATION, ANY LOST
PROFITS, BUSINESS INTERRUPTION, LOSS OF PROGRAMS OR OTHER DATA ON
YOUR INFORMATION HANDLING SYSTEM OR OTHERWISE, EVEN If WE ARE
EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*/

using System.IO;
using System.Text.RegularExpressions;
using System.Collections;
using System.Diagnostics;
using System;

// IniFile class used to read and write ini files by loading the file into memory
public class IniFile
{
    // List of IniSection objects keeps track of all the sections in the INI file
    private Hashtable m_sections;

    // Public constructor
    public IniFile()
    {
        m_sections = new Hashtable(StringComparer.InvariantCultureIgnoreCase);
    }

    // Loads the Reads the data in the ini file into the IniFile object
    public void Load(string sFileName )
    {
        Load(sFileName, false);
    }

    // Loads the Reads the data in the ini file into the IniFile object
    public void Load(string sFileName, bool bMerge )
    {
        if (!bMerge)
        {
            RemoveAllSections();
        }
        //  Clear the object... 
        IniSection tempsection = null;
        StreamReader oReader = new StreamReader(sFileName);
        Regex regexcomment = new Regex("^([\\s]*#.*)", (RegexOptions.Singleline | RegexOptions.IgnoreCase));
        Regex regexsection = new Regex("^[\\s]*\\[[\\s]*([^\\[\\s].*[^\\s\\]])[\\s]*\\][\\s]*$", (RegexOptions.Singleline | RegexOptions.IgnoreCase));
        Regex regexkey = new Regex("^\\s*([^=]*[^\\s=])\\s*=(.*)", (RegexOptions.Singleline | RegexOptions.IgnoreCase));

        while (!oReader.EndOfStream)
        {
            string line = oReader.ReadLine();
            if (line != string.Empty)
            {
                Match m = null;
                if (regexcomment.Match(line).Success)
                {
                    m = regexcomment.Match(line);
                    Trace.WriteLine(string.Format("Skipping Comment: {0}", m.Groups[0].Value));
                }
                else if (regexsection.Match(line).Success)
                {
                    m = regexsection.Match(line);
                    Trace.WriteLine(string.Format("Adding section [{0}]", m.Groups[1].Value));
                    tempsection = AddSection(m.Groups[1].Value);
                }
                else if ( regexkey.Match(line).Success && tempsection != null)
                {
                    m = regexkey.Match(line);
                    Trace.WriteLine(string.Format("Adding Key [{0}]=[{1}]", m.Groups[1].Value, m.Groups[2].Value));
                    tempsection.AddKey(m.Groups[1].Value).Value = m.Groups[2].Value;
                }
                else if ( tempsection != null )
                {
                    //  Handle Key without Value
                    Trace.WriteLine(string.Format("Adding Key [{0}]", line));
                    tempsection.AddKey(line);
                }
                else
                {
                    //  This should not occur unless the tempsection is not created yet...
                    Trace.WriteLine(string.Format("Skipping unknown type of data: {0}", line));
                }
            }
        }
        oReader.Close();
    }

    // Used to save the data back to the file or your choice
    public void Save(string sFileName)
    {
        StreamWriter oWriter = new StreamWriter(sFileName, false);
        foreach (IniSection s in Sections)
        {
            Trace.WriteLine(string.Format("Writing Section: [{0}]", s.Name));
            oWriter.WriteLine(string.Format("[{0}]", s.Name));
            foreach (IniSection.IniKey k in s.Keys)
            {
                if (k.Value != string.Empty)
                {
                    Trace.WriteLine(string.Format("Writing Key: {0}={1}", k.Name, k.Value));
                    oWriter.WriteLine(string.Format("{0}={1}", k.Name, k.Value));
                }
                else
                {
                    Trace.WriteLine(string.Format("Writing Key: {0}", k.Name));
                    oWriter.WriteLine(string.Format("{0}", k.Name));
                }
            }
        }
        oWriter.Close();
    }

    // Gets all the sections names
    public System.Collections.ICollection Sections
    {
        get
        {
            return m_sections.Values;
        }
    }

    // Adds a section to the IniFile object, returns a IniSection object to the new or existing object
    public IniSection AddSection(string sSection )
    {
        IniSection s = null;
        sSection = sSection.Trim();
        // Trim spaces
        if (m_sections.ContainsKey(sSection))
        {
            s = (IniSection)m_sections[sSection];
        }
        else
        {
            s = new IniSection(this, sSection);
            m_sections[sSection] = s;
        }
        return s;
    }

    // Removes a section by its name sSection, returns trus on success
    public bool RemoveSection(string sSection)
    {
        sSection = sSection.Trim();
        return RemoveSection(GetSection(sSection));
    }

    // Removes section by object, returns trus on success
    public bool RemoveSection(IniSection Section)
    {
        if (Section != null)
        {
            try
            {
                m_sections.Remove(Section.Name);
                return true;
            }
            catch( Exception ex )
            {
                Trace.WriteLine(ex.Message);
            }
        }
        return false;
    }

    //  Removes all existing sections, returns trus on success
    public bool RemoveAllSections()
    {
        m_sections.Clear();
        return (m_sections.Count == 0);
    }

    // Returns an IniSection to the section by name, NULL if it was not found
    public IniSection GetSection(string sSection)
    {
        sSection = sSection.Trim();
        // Trim spaces
        if (m_sections.ContainsKey(sSection))
        {
            return (IniSection)m_sections[sSection];
        }
        return null;
    }

    //  Returns a KeyValue in a certain section
    public string GetKeyValue(string sSection, string sKey)
    {
        IniSection s = GetSection(sSection);
        if (s != null)
        {
            IniSection.IniKey k = s.GetKey(sKey);
            if (k != null)
            {
                return k.Value;
            }
        }
        return string.Empty;
    }

    // Sets a KeyValuePair in a certain section
    public bool SetKeyValue(string sSection, string sKey, string sValue)
    {
        IniSection s = AddSection(sSection);
        if (s != null)
        {
            IniSection.IniKey k = s.AddKey(sKey);
            if (k != null)
            {
                k.Value = sValue;
                return true;
            }
        }
        return false;
    }

    // Renames an existing section returns true on success, false if the section didn't exist or there was another section with the same sNewSection
    public bool RenameSection(string sSection, string sNewSection)
    {
        //  Note string trims are done in lower calls.
        bool bRval = false;
        IniSection s = GetSection(sSection);
        if (s != null)
        {
            bRval = s.SetName(sNewSection);
        }
        return bRval;
    }

    // Renames an existing key returns true on success, false if the key didn't exist or there was another section with the same sNewKey
    public bool RenameKey(string sSection, string sKey, string sNewKey)
    {
        //  Note string trims are done in lower calls.
        IniSection s = GetSection(sSection);
        if (s != null)
        {
            IniSection.IniKey k = s.GetKey(sKey);
            if (k != null)
            {
                return k.SetName(sNewKey);
            }
        }
        return false;
    }

    // IniSection class 
    public class IniSection
    {
        //  IniFile IniFile object instance
        private IniFile m_pIniFile;
        //  Name of the section
        private string m_sSection;
        //  List of IniKeys in the section
        private Hashtable m_keys;

        // Constuctor so objects are internally managed
        protected internal IniSection(IniFile parent, string sSection)
        {
            m_pIniFile = parent;
            m_sSection = sSection;
            m_keys = new Hashtable(StringComparer.InvariantCultureIgnoreCase);
        }

        // Returns and hashtable of keys associated with the section
        public System.Collections.ICollection Keys
        {
            get
            {
                return m_keys.Values;
            }
        }

        // Returns the section name
        public string Name
        {
            get
            {
                return m_sSection;
            }
        }

        // Adds a key to the IniSection object, returns a IniKey object to the new or existing object
        public IniKey AddKey(string sKey)
        {
            sKey = sKey.Trim();
            IniSection.IniKey k = null;
            if (sKey.Length != 0)
            {
                if (m_keys.ContainsKey(sKey))
                {
                    k = (IniKey)m_keys[sKey];
                }
                else
                {
                    k = new IniSection.IniKey(this, sKey);
                    m_keys[sKey] = k;
                }
            }
            return k;
        }

        // Removes a single key by string
        public bool RemoveKey(string sKey)
        {
            return RemoveKey(GetKey(sKey));
        }

        // Removes a single key by IniKey object
        public bool RemoveKey(IniKey Key)
        {
            if (Key != null)
            {
                try
                {
                    m_keys.Remove(Key.Name);
                    return true;
                }
                catch (Exception ex)
                {
                    Trace.WriteLine(ex.Message);
                }
            }
            return false;
        }

        // Removes all the keys in the section
        public bool RemoveAllKeys()
        {
            m_keys.Clear();
            return (m_keys.Count == 0);
        }

        // Returns a IniKey object to the key by name, NULL if it was not found
        public IniKey GetKey(string sKey)
        {
            sKey = sKey.Trim();
            if (m_keys.ContainsKey(sKey))
            {
                return (IniKey)m_keys[sKey];
            }
            return null;
        }

        // Sets the section name, returns true on success, fails if the section
        // name sSection already exists
        public bool SetName(string sSection)
        {
            sSection = sSection.Trim();
            if (sSection.Length != 0)
            {
                // Get existing section if it even exists...
                IniSection s = m_pIniFile.GetSection(sSection);
                if (s != this && s != null) return false;
                try
                {
                    // Remove the current section
                    m_pIniFile.m_sections.Remove(m_sSection);
                    // Set the new section name to this object
                    m_pIniFile.m_sections[sSection] = this;
                    // Set the new section name
                    m_sSection = sSection;
                    return true;
                }
                catch (Exception ex)
                {
                    Trace.WriteLine(ex.Message);
                }
            }
            return false;
        }

        // Returns the section name
        public string GetName()
        {
            return m_sSection;
        }

        // IniKey class
        public class IniKey
        {
            //  Name of the Key
            private string m_sKey;
            //  Value associated
            private string m_sValue;
            //  Pointer to the parent CIniSection
            private IniSection m_section;

            // Constuctor so objects are internally managed
            protected internal IniKey(IniSection parent, string sKey)
            {
                m_section = parent;
                m_sKey = sKey;
            }

            // Returns the name of the Key
            public string Name
            {
                get
                {
                    return m_sKey;
                }
            }

            // Sets or Gets the Value of the key
            public string Value
            {
                get
                {
                    return m_sValue;
                }
                set
                {
                    m_sValue = value;
                }
            }

            // Sets the Value of the key
            public void SetValue(string sValue)
            {
                m_sValue = sValue;
            }
            // Returns the Value of the Key
            public string GetValue()
            {
                return m_sValue;
            }

            // Sets the key name
            // Returns true on success, fails if the section name sKey already exists
            public bool SetName(string sKey)
            {
                sKey = sKey.Trim();
                if (sKey.Length != 0)
                {
                    IniKey k = m_section.GetKey(sKey);
                    if (k != this && k != null) return false;
                    try
                    {
                        // Remove the current key
                        m_section.m_keys.Remove(m_sKey);
                        // Set the new key name to this object
                        m_section.m_keys[sKey] = this;
                        // Set the new key name
                        m_sKey = sKey;
                        return true;
                    }
                    catch (Exception ex)
                    {
                        Trace.WriteLine(ex.Message);
                    }
                }
                return false;
            }

            // Returns the name of the Key
            public string GetName()
            {
                return m_sKey;
            }
        } // End of IniKey class
    } // End of IniSection class
} // End of IniFile class