/**
 * vim: set ts=4 sw=4 tw=99 noet :
 * =============================================================================
 * SourceMod (C)2004-2014 AlliedModders LLC.  All rights reserved.
 * =============================================================================
 *
 * This file is part of the SourceMod/SourcePawn SDK.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 3.0, as published by the
 * Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, AlliedModders LLC gives you permission to link the
 * code of this program (as well as its derivative works) to "Half-Life 2," the
 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
 * by the Valve Corporation.  You must obey the GNU General Public License in
 * all respects for all other code used.  Additionally, AlliedModders LLC grants
 * this exception to all derivative works.  AlliedModders LLC defines further
 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
 * or <http://www.sourcemod.net/license.php>.
 *
 * Version: $Id$
 */

#if defined _textparse_included
 #endinput
#endif
#define _textparse_included


/********************************
 * Everything below describes the SMC Parse, or "SourceMod Configuration" format.
 * This parser is entirely event based.  You must hook events to receive data.
 * The file format itself is nearly identical to Valve's KeyValues format.
 ********************************/

/**
 * Parse result directive.
 */
enum SMCResult
{
	SMCParse_Continue,          /**< Continue parsing */
	SMCParse_Halt,              /**< Stop parsing here */
	SMCParse_HaltFail           /**< Stop parsing and return failure */
};

/**
 * Parse error codes.
 */
enum SMCError
{
	SMCError_Okay = 0,          /**< No error */
	SMCError_StreamOpen,        /**< Stream failed to open */
	SMCError_StreamError,       /**< The stream died... somehow */
	SMCError_Custom,            /**< A custom handler threw an error */
	SMCError_InvalidSection1,   /**< A section was declared without quotes, and had extra tokens */
	SMCError_InvalidSection2,   /**< A section was declared without any header */
	SMCError_InvalidSection3,   /**< A section ending was declared with too many unknown tokens */
	SMCError_InvalidSection4,   /**< A section ending has no matching beginning */
	SMCError_InvalidSection5,   /**< A section beginning has no matching ending */
	SMCError_InvalidTokens,     /**< There were too many unidentifiable strings on one line */
	SMCError_TokenOverflow,     /**< The token buffer overflowed */
	SMCError_InvalidProperty1   /**< A property was declared outside of any section */
};

/**
 * Called when parsing is started.
 *
 * @param smc           The SMC Parse Handle.
 */
typedef SMC_ParseStart = function void (SMCParser smc);

/**
 * Called when the parser is entering a new section or sub-section.
 *
 * Note: Enclosing quotes are always stripped.
 *
 * @param smc           The SMC Parser.
 * @param name          String containing section name.
 * @param opt_quotes    True if the section name was quote-enclosed in the file.
 * @return              An SMCResult action to take.
 */
typedef SMC_NewSection = function SMCResult (SMCParser smc, const char[] name, bool opt_quotes);

/**
 * Called when the parser finds a new key/value pair.
 *
 * Note: Enclosing quotes are always stripped.
 *
 * @param smc           The SMCParser.
 * @param key           String containing key name.
 * @param value         String containing value name.
 * @param key_quotes    Whether or not the key was enclosed in quotes.
 * @param value_quotes  Whether or not the value was enclosed in quotes.
 * @return              An SMCResult action to take.
 */
typedef SMC_KeyValue = function SMCResult (SMCParser smc, const char[] key, const char[] value, bool key_quotes, bool value_quotes);

/** Called when the parser finds the end of the current section.
 *
 * @param smc           The SMCParser.
 * @return              An SMCResult action to take.
 */
typedef SMC_EndSection = function SMCResult (SMCParser smc);

/**
 * Called when parsing is halted.
 *
 * @param smc           The SMCParser.
 * @param halted        True if abnormally halted, false otherwise.
 * @param failed        True if parsing failed, false otherwise.
 */
typedef SMC_ParseEnd = function void (SMCParser smc, bool halted, bool failed);

/**
 * Callback for whenever a new line of text is about to be parsed.
 *
 * @param smc           The SMCParser.
 * @param line          A string containing the raw line from the file.
 * @param lineno        The line number it occurs on.
 * @return              An SMCResult action to take.
 */
typedef SMC_RawLine = function SMCResult (SMCParser smc, const char[] line, int lineno);

// An SMCParser is a callback-driven parser for SourceMod configuration files.
// SMC files are similar to Valve KeyValues format, with two key differences:
//  (1) SMC cannot handle single-item entries (that is, a key with no value).
//  (2) SMC files can have multi-line comment blocks, whereas KeyValues cannot.
methodmap SMCParser < Handle
{
	// Create a new SMC file format parser.
	public native SMCParser();

	// Parses an SMC file.
	//
	// @param file          A string containing the file path.
	// @param line          An optional variable to store the last line number read.
	// @param col           An optional variable to store the last column number read.
	// @return              An SMCParseError result.
	public native SMCError ParseFile(const char[] file, int &line = 0, int &col = 0);

	// Sets the callback for receiving SMC_ParseStart events.
	property SMC_ParseStart OnStart {
		public native set(SMC_ParseStart func);
	}

	// Sets the callback for receiving SMC_ParseEnd events.
	property SMC_ParseEnd OnEnd {
		public native set(SMC_ParseEnd func);
	}

	// Sets the callback for receiving SMC_NewSection events.
	property SMC_NewSection OnEnterSection {
		public native set(SMC_NewSection func);
	}

	// Sets the callback for receiving SMC_EndSection events.
	property SMC_EndSection OnLeaveSection {
		public native set(SMC_EndSection func);
	}

	// Sets the callback for receiving SMC_KeyValue events.
	property SMC_KeyValue OnKeyValue {
		public native set(SMC_KeyValue func);
	}

	// Sets the callback for receiving SMC_RawLine events.
	property SMC_RawLine OnRawLine {
		public native set(SMC_RawLine func);
	}

	// Gets an error string for an SMCError code.
	//
	// @param error         The SMCParseError code.
	// @param buffer        A string buffer for the error (contents undefined on failure).
	// @param buf_max       The maximum size of the buffer.
	// @return              The number of characters written to buffer.
	public native void GetErrorString(SMCError error, char[] buffer, int buf_max);
};

/**
 * Creates a new SMC file format parser.  This is used to set parse hooks.
 *
 * @return              A new Handle to an SMC Parse structure.
 */
native SMCParser SMC_CreateParser();

/**
 * Parses an SMC file.
 *
 * @param smc           A Handle to an SMC Parse structure.
 * @param file          A string containing the file path.
 * @param line          An optional by reference cell to store the last line number read.
 * @param col           An optional by reference cell to store the last column number read.
 * @return              An SMCParseError result.
 * @error               Invalid or corrupt Handle.
 */
native SMCError SMC_ParseFile(Handle smc, const char[] file, int &line=0, int &col=0);

/**
 * Gets an error string for an SMCError code.
 *
 * @note SMCError_Okay returns false.
 * @note SMCError_Custom (which is thrown on SMCParse_HaltFail) returns false.
 *
 * @param error         The SMCParseError code.
 * @param buffer        A string buffer for the error (contents undefined on failure).
 * @param buf_max       The maximum size of the buffer.
 * @return              True on success, false otherwise.
 */
native bool SMC_GetErrorString(SMCError error, char[] buffer, int buf_max);

/**
 * Sets the SMC_ParseStart function of a parse Handle.
 *
 * @param smc           Handle to an SMC Parse.
 * @param func          SMC_ParseStart function.
 * @error               Invalid or corrupt Handle.
 */
native void SMC_SetParseStart(Handle smc, SMC_ParseStart func);

/**
 * Sets the SMC_ParseEnd of a parse handle.
 *
 * @param smc           Handle to an SMC Parse.
 * @param func          SMC_ParseEnd function.
 * @error               Invalid or corrupt Handle.
 */
native void SMC_SetParseEnd(Handle smc, SMC_ParseEnd func);

/**
 * Sets the three main reader functions.
 *
 * @param smc           An SMC parse Handle.
 * @param ns            An SMC_NewSection function pointer.
 * @param kv            An SMC_KeyValue function pointer.
 * @param es            An SMC_EndSection function pointer.
 */
native void SMC_SetReaders(Handle smc, SMC_NewSection ns, SMC_KeyValue kv, SMC_EndSection es);

/**
 * Sets a raw line reader on an SMC parser Handle.
 *
 * @param smc           Handle to an SMC Parse.
 * @param func          SMC_RawLine function.
 */
native void SMC_SetRawLine(Handle smc, SMC_RawLine func);