//===-- MICmdInterpreter.cpp ------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

//++
// File:		MICmdInterpreter.cpp
//
// Overview:	CMICmdInterpreter implementation.
//
// Environment:	Compilers:	Visual C++ 12.
//							gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
//				Libraries:	See MIReadmetxt. 
//
// Copyright:	None.
//--

// In-house headers:
#include "MICmdInterpreter.h"
#include "MICmdFactory.h"

//++ ------------------------------------------------------------------------------------
// Details:	CMICmdInterpreter constructor.
// Type:	Method.
// Args:	None.
// Return:	None.
// Throws:	None.
//--
CMICmdInterpreter::CMICmdInterpreter( void )
:	m_rCmdFactory( CMICmdFactory::Instance() )
{
}

//++ ------------------------------------------------------------------------------------
// Details:	CMICmdInterpreter destructor.
// Type:	Overridable.
// Args:	None.
// Return:	None.
// Throws:	None.
//--
CMICmdInterpreter::~CMICmdInterpreter( void )
{
	Shutdown();
}

//++ ------------------------------------------------------------------------------------
// Details:	Initialize resources for *this Command Interpreter.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMICmdInterpreter::Initialize( void )
{
	m_clientUsageRefCnt++;

	if( m_bInitialized )
		return MIstatus::success;

	m_bInitialized = true;

	return  MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Release resources for *this Command Interpreter.
// Type:	Method.
// Args:	None.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMICmdInterpreter::Shutdown( void )
{
	if( --m_clientUsageRefCnt > 0 )
		return MIstatus::success;
	
	if( !m_bInitialized )
		return MIstatus::success;

	m_bInitialized = false;

	return MIstatus::success;
}	

//++ ------------------------------------------------------------------------------------
// Details:	Establish whether the text data is an MI format type command.
// Type:	Method.
// Args:	vTextLine				- (R) Text data to interpret.
//			vwbYesValid				- (W) True = MI type command, false = not recognised.
//			vwbCmdNotInCmdFactor	- (W) True = MI command not found in the command factory, false = recognised.
// Return:	MIstatus::success - Functional succeeded.
//			MIstatus::failure - Functional failed.
// Throws:	None.
//--
bool CMICmdInterpreter::ValidateIsMi( const CMIUtilString & vTextLine, bool & vwbYesValid, bool & vwbCmdNotInCmdFactor, SMICmdData & rwCmdData )
{
	vwbYesValid = false;
	vwbCmdNotInCmdFactor = false;
	rwCmdData.Clear();

	if( vTextLine.empty() )
		return MIstatus::success;

	// MI format is [cmd #]-[command name]<space>[command arg(s)]
	// i.e. 1-file-exec-and-symbols --thread-group i1 DEVICE_EXECUTABLE
	//		5-data-evaluate-expression --thread 1 --frame 0 *(argv)

	m_miCmdData.Clear();			
	m_miCmdData.strMiCmd = vTextLine;

	// The following change m_miCmdData as valid parts are indentified
	vwbYesValid = (MiHasCmdTokenEndingHypthen( vTextLine ) || MiHasCmdTokenEndingAlpha( vTextLine ));
	vwbYesValid = vwbYesValid && MiHasCmd( vTextLine );
	if( vwbYesValid )
	{
		vwbCmdNotInCmdFactor = !HasCmdFactoryGotMiCmd( MiGetCmdData() );
		vwbYesValid = !vwbCmdNotInCmdFactor;
	}

	// Update command's meta data valid state
	m_miCmdData.bCmdValid = vwbYesValid;

	// Ok to return new updated command information
	rwCmdData = MiGetCmdData();

	return MIstatus::success;
}

//++ ------------------------------------------------------------------------------------
// Details:	Establish whether the command name entered on the stdin stream is recognised by 
//			the MI driver.
// Type:	Method.
// Args:	vCmd	- (R) Command information structure.
// Return:	bool  - True = yes command is recognised, false = command not recognised.
// Throws:	None.
//--
bool CMICmdInterpreter::HasCmdFactoryGotMiCmd( const SMICmdData & vCmd ) const
{
	return m_rCmdFactory.CmdExist( vCmd.strMiCmd );
}

//++ ------------------------------------------------------------------------------------
// Details:	Does the command entered match the criteria for a MI command format.
//			The format to validate against is 'nn-' where there can be 1 to n digits.
//			I.e. '2-gdb-exit'.
//			Is the execution token present? The command token is entered into the
//			command meta data structure whether correct or not for reporting or later
//			command execution purposes.
// Type:	Method.
// Args:	vTextLine	- (R) Text data to interpret.
// Return:	bool  - True = yes command token present, false = command not recognised.
// Throws:	None.
//--
bool CMICmdInterpreter::MiHasCmdTokenEndingHypthen( const CMIUtilString & vTextLine )
{
	// The hythen is mandatory
	const MIint nPos = vTextLine.find( "-", 0 );
	if( (nPos == (MIint) std::string::npos) )
		return false;

	if( MiHasCmdTokenPresent( vTextLine ) )
	{
		const std::string strNum = vTextLine.substr( 0, nPos );
		if( !CMIUtilString( strNum.c_str() ).IsNumber() )
			return false;
	
		m_miCmdData.strMiCmdToken = strNum.c_str();
	}

	m_miCmdData.bMIOldStyle = false;

	return true;
}

//++ ------------------------------------------------------------------------------------
// Details:	Does the command entered match the criteria for a MI command format.
//			The format to validate against is 'nnA' where there can be 1 to n digits.
//			'A' represents any non numeric token. I.e. '1source .gdbinit'.
//			Is the execution token present? The command token is entered into the
//			command meta data structure whether correct or not for reporting or later
//			command execution purposes.
// Type:	Method.
// Args:	vTextLine	- (R) Text data to interpret.
// Return:	bool  - True = yes command token present, false = command not recognised.
// Throws:	None.
//--
bool CMICmdInterpreter::MiHasCmdTokenEndingAlpha( const CMIUtilString & vTextLine )
{
	MIchar cChar = vTextLine[ 0 ]; 
	MIuint i = 0;
	while( ::isdigit( cChar ) != 0 )
	{
		cChar = vTextLine[ ++i ];
	}
	if( ::isalpha( cChar ) == 0 )
		return false;
	if( i == 0 )
		return false;
	
	const std::string strNum = vTextLine.substr( 0, i );
	m_miCmdData.strMiCmdToken = strNum.c_str();
	m_miCmdData.bMIOldStyle = true;

	return true;
}

//++ ------------------------------------------------------------------------------------
// Details:	Does the command entered match the criteria for a MI command format.
//			Is the command token present before the hypen? 
// Type:	Method.
// Args:	vTextLine - (R) Text data to interpret.
// Return:	bool  - True = yes command token present, false = token not present.
// Throws:	None.
//--
bool CMICmdInterpreter::MiHasCmdTokenPresent( const CMIUtilString & vTextLine )
{
	const MIint nPos = vTextLine.find( "-", 0 );
	return (nPos > 0);
}

//++ ------------------------------------------------------------------------------------
// Details:	Does the command name entered match the criteria for a MI command format.
//			Is a recogised command present? The command name is entered into the
//			command meta data structure whether correct or not for reporting or later
//			command execution purposes. Command options is present are also put into the
//			command meta data structure.
// Type:	Method.
// Args:	vTextLine	- (R) Command information structure.
// Return:	bool  - True = yes command name present, false = command not recognised.
// Throws:	None.
//--
bool CMICmdInterpreter::MiHasCmd( const CMIUtilString & vTextLine )
{
	MIint nPos = 0;
	if( m_miCmdData.bMIOldStyle )
	{
		char cChar = vTextLine[ 0 ]; 
		MIuint i = 0;
		while( ::isdigit( cChar ) != 0 )
		{
			cChar = vTextLine[ ++i ];
		}
		nPos = --i;
	}
	else
	{
		nPos = vTextLine.find( "-", 0 );
	}

	bool bFoundCmd = false;
	const MIint nLen = vTextLine.length();
	const MIint nPos2 = vTextLine.find( " ", nPos );
	if( nPos2 != (MIint) std::string::npos )
	{
		if( nPos2 == nLen )
			return false;
		const CMIUtilString cmd = CMIUtilString( vTextLine.substr( nPos + 1, nPos2 - nPos - 1 ).c_str() );
		if( cmd.empty() )
			return false;
		
		m_miCmdData.strMiCmd = cmd;
		
		if( nPos2 < nLen )
			m_miCmdData.strMiCmdOption = CMIUtilString( vTextLine.substr( nPos2 + 1, nLen - nPos2 - 1 ).c_str() );
		
		bFoundCmd = true;
	}
	else
	{
		const CMIUtilString cmd = CMIUtilString( vTextLine.substr( nPos + 1, nLen - nPos - 1 ).c_str() );
		if( cmd.empty() )
			return false;
		m_miCmdData.strMiCmd = cmd;
		bFoundCmd = true;
	}

	if( bFoundCmd )
		m_miCmdData.strMiCmdAll = vTextLine;

	return bFoundCmd;
}

//++ ------------------------------------------------------------------------------------
// Details:	Retrieve the just entered new command from stdin. It contains the command
//			name, number and any options.
// Type:	Method.
// Args:	vTextLine	- (R) Command information structure.
// Return:	SMICmdData & - Command meta data information/result/status.
// Throws:	None.
//--
const SMICmdData & CMICmdInterpreter::MiGetCmdData( void ) const
{
	return m_miCmdData;
}