<?php
/**
 * Kint is a zero-setup debugging tool to output information about variables and stack traces prettily and comfortably.
 *
 * https://github.com/raveren/kint
 */


if ( defined( 'KINT_DIR' ) ) return;


define( 'KINT_DIR', dirname( __FILE__ ) . '/' );
define( 'KINT_PHP53', version_compare( PHP_VERSION, '5.3.0' ) >= 0 );

require KINT_DIR . 'config.default.php';
require KINT_DIR . 'inc/kintVariableData.class.php';
require KINT_DIR . 'inc/kintParser.class.php';
require KINT_DIR . 'inc/kintObject.class.php';
require KINT_DIR . 'decorators/rich.php';
require KINT_DIR . 'decorators/plain.php';

if ( is_readable( KINT_DIR . 'config.php' ) ) {
	require KINT_DIR . 'config.php';
}

# init settings
if ( !empty( $GLOBALS['_kint_settings'] ) ) {
	Kint::enabled( $GLOBALS['_kint_settings']['enabled'] );

	foreach ( $GLOBALS['_kint_settings'] as $key => $val ) {
		property_exists( 'Kint', $key ) and Kint::$$key = $val;
	}

	unset( $GLOBALS['_kint_settings'], $key, $val );
}

class Kint
{
	// these are all public and 1:1 config array keys so you can switch them easily
	private static $_enabledMode; # stores mode and active statuses

	public static $returnOutput;
	public static $fileLinkFormat;
	public static $displayCalledFrom;
	public static $charEncodings;
	public static $maxStrLength;
	public static $appRootDirs;
	public static $maxLevels;
	public static $theme;
	public static $expandedByDefault;

	public static $cliDetection;
	public static $cliColors;

	const MODE_RICH       = 'r';
	const MODE_WHITESPACE = 'w';
	const MODE_CLI        = 'c';
	const MODE_PLAIN      = 'p';


	public static $aliases = array(
		'methods'   => array(
			array( 'kint', 'dump' ),
			array( 'kint', 'trace' ),
		),
		'functions' => array(
			'd',
			'dd',
			'ddd',
			's',
			'sd',
		)
	);

	private static $_firstRun = true;

	/**
	 * Enables or disables Kint, can globally enforce the rendering mode. If called without parameters, returns the
	 * current mode.
	 *
	 * @param mixed $forceMode
	 *      null or void - return current mode
	 *      false        - disable (no output)
	 *      true         - enable and detect cli automatically
	 *      Kint::MODE_* - enable and force selected mode disregarding detection and function
	 *                     shorthand (s()/d()), note that you can still override this
	 *                     with the "~" modifier
	 *
	 * @return mixed        previously set value if a new one is passed
	 */
	public static function enabled( $forceMode = null )
	{
		# act both as a setter...
		if ( isset( $forceMode ) ) {
			$before             = self::$_enabledMode;
			self::$_enabledMode = $forceMode;

			return $before;
		}

		# ...and a getter
		return self::$_enabledMode;
	}

	/**
	 * Prints a debug backtrace, same as Kint::dump(1)
	 *
	 * @param array $trace [OPTIONAL] you can pass your own trace, otherwise, `debug_backtrace` will be called
	 *
	 * @return mixed
	 */
	public static function trace( $trace = null )
	{
		if ( !self::enabled() ) return '';

		return self::dump( isset( $trace ) ? $trace : debug_backtrace( true ) );
	}


	/**
	 * Dump information about variables, accepts any number of parameters, supports modifiers:
	 *
	 *  clean up any output before kint and place the dump at the top of page:
	 *   - Kint::dump()
	 *  *****
	 *  expand all nodes on display:
	 *   ! Kint::dump()
	 *  *****
	 *  dump variables disregarding their depth:
	 *   + Kint::dump()
	 *  *****
	 *  return output instead of displaying it:
	 *   @ Kint::dump()
	 *  *****
	 *  force output as plain text
	 *   ~ Kint::dump()
	 *
	 * Modifiers are supported by all dump wrapper functions, including Kint::trace(). Space is optional.
	 *
	 *
	 * You can also use the following shorthand to display debug_backtrace():
	 *   Kint::dump( 1 );
	 *
	 * Passing the result from debug_backtrace() to kint::dump() as a single parameter will display it as trace too:
	 *   $trace = debug_backtrace( true );
	 *   Kint::dump( $trace );
	 *  Or simply:
	 *   Kint::dump( debug_backtrace() );
	 *
	 *
	 * @param mixed $data
	 *
	 * @return void|string
	 */
	public static function dump( $data = null )
	{
		if ( !self::enabled() ) return '';

		list( $names, $modifiers, $callee, $previousCaller, $miniTrace ) = self::_getCalleeInfo(
			defined( 'DEBUG_BACKTRACE_IGNORE_ARGS' )
				? debug_backtrace( DEBUG_BACKTRACE_IGNORE_ARGS )
				: debug_backtrace()
		);
		$modeOldValue     = self::enabled();
		$firstRunOldValue = self::$_firstRun;

		# process modifiers: @, +, !, ~ and -
		if ( strpos( $modifiers, '-' ) !== false ) {
			self::$_firstRun = true;
			while ( ob_get_level() ) {
				ob_end_clean();
			}
		}
		if ( strpos( $modifiers, '!' ) !== false ) {
			$expandedByDefaultOldValue = self::$expandedByDefault;
			self::$expandedByDefault   = true;
		}
		if ( strpos( $modifiers, '+' ) !== false ) {
			$maxLevelsOldValue = self::$maxLevels;
			self::$maxLevels   = false;
		}
		if ( strpos( $modifiers, '@' ) !== false ) {
			$returnOldValue     = self::$returnOutput;
			self::$returnOutput = true;
			self::$_firstRun    = true;
		}
		if ( strpos( $modifiers, '~' ) !== false ) {
			self::enabled( self::MODE_WHITESPACE );
		}

		# set mode for current run
		$mode = self::enabled();
		if ( $mode === true ) {
			$mode = PHP_SAPI === 'cli'
				? self::MODE_CLI
				: self::MODE_RICH;
		}
		self::enabled( $mode );

		$decorator = self::enabled() === self::MODE_RICH
			? 'Kint_Decorators_Rich'
			: 'Kint_Decorators_Plain';

		$output = '';
		if ( self::$_firstRun ) {
			$output .= call_user_func( array( $decorator, 'init' ) );
		}


		$trace = false;
		if ( $names === array( null ) && func_num_args() === 1 && $data === 1 ) { # Kint::dump(1) shorthand
			$trace = KINT_PHP53 ? debug_backtrace( true ) : debug_backtrace();
		} elseif ( func_num_args() === 1 && is_array( $data ) ) {
			$trace = $data; # test if the single parameter is result of debug_backtrace()
		}
		$trace and $trace = self::_parseTrace( $trace );


		$output .= call_user_func( array( $decorator, 'wrapStart' ) );
		if ( $trace ) {
			$output .= call_user_func( array( $decorator, 'decorateTrace' ), $trace );
		} else {
			$data = func_num_args() === 0
				? array( "[[no arguments passed]]" )
				: func_get_args();

			foreach ( $data as $k => $argument ) {
				kintParser::reset();
				# when the dump arguments take long to generate output, user might have changed the file and
				# Kint might not parse the arguments correctly, so check if names are set and while the
				# displayed names might be wrong, at least don't throw an error
				$output .= call_user_func(
					array( $decorator, 'decorate' ),
					kintParser::factory( $argument, isset( $names[ $k ] ) ? $names[ $k ] : '' )
				);
			}
		}

		$output .= call_user_func( array( $decorator, 'wrapEnd' ), $callee, $miniTrace, $previousCaller );

		self::enabled( $modeOldValue );

		self::$_firstRun = false;
		if ( strpos( $modifiers, '~' ) !== false ) {
			self::$_firstRun = $firstRunOldValue;
		} else {
			self::enabled( $modeOldValue );
		}
		if ( strpos( $modifiers, '!' ) !== false ) {
			self::$expandedByDefault = $expandedByDefaultOldValue;
		}
		if ( strpos( $modifiers, '+' ) !== false ) {
			self::$maxLevels = $maxLevelsOldValue;
		}
		if ( strpos( $modifiers, '@' ) !== false ) {
			self::$returnOutput = $returnOldValue;
			self::$_firstRun    = $firstRunOldValue;
			return $output;
		}

		if ( self::$returnOutput ) return $output;

		echo $output;
		return '';
	}


	/**
	 * generic path display callback, can be configured in the settings; purpose is to show relevant path info and hide
	 * as much of the path as possible.
	 *
	 * @param string $file
	 *
	 * @return string
	 */
	public static function shortenPath( $file )
	{
		$file          = str_replace( '\\', '/', $file );
		$shortenedName = $file;
		$replaced      = false;
		if ( is_array( self::$appRootDirs ) ) foreach ( self::$appRootDirs as $path => $replaceString ) {
			if ( empty( $path ) ) continue;

			$path = str_replace( '\\', '/', $path );

			if ( strpos( $file, $path ) === 0 ) {
				$shortenedName = $replaceString . substr( $file, strlen( $path ) );
				$replaced      = true;
				break;
			}
		}

		# fallback to find common path with Kint dir
		if ( !$replaced ) {
			$pathParts = explode( '/', str_replace( '\\', '/', KINT_DIR ) );
			$fileParts = explode( '/', $file );
			$i         = 0;
			foreach ( $fileParts as $i => $filePart ) {
				if ( !isset( $pathParts[ $i ] ) || $pathParts[ $i ] !== $filePart ) break;
			}

			$shortenedName = ( $i ? '.../' : '' ) . implode( '/', array_slice( $fileParts, $i ) );
		}

		return $shortenedName;
	}

	public static function getIdeLink( $file, $line )
	{
		return str_replace( array( '%f', '%l' ), array( $file, $line ), self::$fileLinkFormat );
	}

	/**
	 * trace helper, shows the place in code inline
	 *
	 * @param string $file full path to file
	 * @param int    $lineNumber the line to display
	 * @param int    $padding surrounding lines to show besides the main one
	 *
	 * @return bool|string
	 */
	private static function _showSource( $file, $lineNumber, $padding = 7 )
	{
		if ( !$file OR !is_readable( $file ) ) {
			# continuing will cause errors
			return false;
		}

		# open the file and set the line position
		$file = fopen( $file, 'r' );
		$line = 0;

		# Set the reading range
		$range = array(
			'start' => $lineNumber - $padding,
			'end'   => $lineNumber + $padding
		);

		# set the zero-padding amount for line numbers
		$format = '% ' . strlen( $range['end'] ) . 'd';

		$source = '';
		while ( ( $row = fgets( $file ) ) !== false ) {
			# increment the line number
			if ( ++$line > $range['end'] ) {
				break;
			}

			if ( $line >= $range['start'] ) {
				# make the row safe for output
				$row = htmlspecialchars( $row, ENT_NOQUOTES, 'UTF-8' );

				# trim whitespace and sanitize the row
				$row = '<span>' . sprintf( $format, $line ) . '</span> ' . $row;

				if ( $line === $lineNumber ) {
					# apply highlighting to this row
					$row = '<div class="kint-highlight">' . $row . '</div>';
				} else {
					$row = '<div>' . $row . '</div>';
				}

				# add to the captured source
				$source .= $row;
			}
		}

		# close the file
		fclose( $file );

		return $source;
	}


	/**
	 * returns parameter names that the function was passed, as well as any predefined symbols before function
	 * call (modifiers)
	 *
	 * @param array $trace
	 *
	 * @return array( $parameters, $modifier, $callee, $previousCaller )
	 */
	private static function _getCalleeInfo( $trace )
	{
		$previousCaller = array();
		$miniTrace      = array();
		$prevStep       = array();

		# go from back of trace to find first occurrence of call to Kint or its wrappers
		while ( $step = array_pop( $trace ) ) {

			if ( self::_stepIsInternal( $step ) ) {
				$previousCaller = $prevStep;
				break;
			} elseif ( isset( $step['file'], $step['line'] ) ) {
				unset( $step['object'], $step['args'] );
				array_unshift( $miniTrace, $step );
			}

			$prevStep = $step;
		}
		$callee = $step;

		if ( !isset( $callee['file'] ) || !is_readable( $callee['file'] ) ) return false;


		# open the file and read it up to the position where the function call expression ended
		$file   = fopen( $callee['file'], 'r' );
		$line   = 0;
		$source = '';
		while ( ( $row = fgets( $file ) ) !== false ) {
			if ( ++$line > $callee['line'] ) break;
			$source .= $row;
		}
		fclose( $file );
		$source = self::_removeAllButCode( $source );


		if ( empty( $callee['class'] ) ) {
			$codePattern = $callee['function'];
		} else {
			if ( $callee['type'] === '::' ) {
				$codePattern = $callee['class'] . "\x07*" . $callee['type'] . "\x07*" . $callee['function'];;
			} else /*if ( $callee['type'] === '->' )*/ {
				$codePattern = ".*\x07*" . $callee['type'] . "\x07*" . $callee['function'];;
			}
		}

		// todo if more than one call in one line - not possible to determine variable names
		// todo does not recognize string concat
		# get the position of the last call to the function
		preg_match_all( "
            [
            # beginning of statement
            [\x07{(]

            # search for modifiers (group 1)
            ([-+!@~]*)?

            # spaces
            \x07*

            # check if output is assigned to a variable (group 2) todo: does not detect concat
            (
                \\$[a-z0-9_]+ # variable
                \x07*\\.?=\x07*  # assignment
            )?

            # possibly a namespace symbol
            \\\\?

			# spaces again
            \x07*

            # main call to Kint
            {$codePattern}

			# spaces everywhere
            \x07*

            # find the character where kint's opening bracket resides (group 3)
            (\\()

            ]ix",
			$source,
			$matches,
			PREG_OFFSET_CAPTURE
		);

		$modifiers  = end( $matches[1] );
		$assignment = end( $matches[2] );
		$bracket    = end( $matches[3] );

		$modifiers = $modifiers[0];
		if ( $assignment[1] !== -1 ) {
			$modifiers .= '@';
		}

		$paramsString = preg_replace( "[\x07+]", ' ', substr( $source, $bracket[1] + 1 ) );
		# we now have a string like this:
		# <parameters passed>); <the rest of the last read line>

		# remove everything in brackets and quotes, we don't need nested statements nor literal strings which would
		# only complicate separating individual arguments
		$c              = strlen( $paramsString );
		$inString       = $escaped = $openedBracket = $closingBracket = false;
		$i              = 0;
		$inBrackets     = 0;
		$openedBrackets = array();

		while ( $i < $c ) {
			$letter = $paramsString[ $i ];

			if ( !$inString ) {
				if ( $letter === '\'' || $letter === '"' ) {
					$inString = $letter;
				} elseif ( $letter === '(' || $letter === '[' ) {
					$inBrackets++;
					$openedBrackets[] = $openedBracket = $letter;
					$closingBracket   = $openedBracket === '(' ? ')' : ']';
				} elseif ( $inBrackets && $letter === $closingBracket ) {
					$inBrackets--;
					array_pop( $openedBrackets );
					$openedBracket  = end( $openedBrackets );
					$closingBracket = $openedBracket === '(' ? ')' : ']';
				} elseif ( !$inBrackets && $letter === ')' ) {
					$paramsString = substr( $paramsString, 0, $i );
					break;
				}
			} elseif ( $letter === $inString && !$escaped ) {
				$inString = false;
			}

			# replace whatever was inside quotes or brackets with untypeable characters, we don't
			# need that info. We'll later replace the whole string with '...'
			if ( $inBrackets > 0 ) {
				if ( $inBrackets > 1 || $letter !== $openedBracket ) {
					$paramsString[ $i ] = "\x07";
				}
			}
			if ( $inString ) {
				if ( $letter !== $inString || $escaped ) {
					$paramsString[ $i ] = "\x07";
				}
			}

			$escaped = !$escaped && ( $letter === '\\' );
			$i++;
		}

		# by now we have an un-nested arguments list, lets make it to an array for processing further
		$arguments = explode( ',', preg_replace( "[\x07+]", '...', $paramsString ) );

		# test each argument whether it was passed literary or was it an expression or a variable name
		$parameters = array();
		$blacklist  = array( 'null', 'true', 'false', 'array(...)', 'array()', '"..."', '[...]', 'b"..."', );
		foreach ( $arguments as $argument ) {
			$argument = trim( $argument );

			if ( is_numeric( $argument )
				|| in_array( str_replace( "'", '"', strtolower( $argument ) ), $blacklist, true )
			) {
				$parameters[] = null;
			} else {
				$parameters[] = $argument;
			}
		}

		return array( $parameters, $modifiers, $callee, $previousCaller, $miniTrace );
	}

	/**
	 * removes comments and zaps whitespace & <?php tags from php code, makes for easier further parsing
	 *
	 * @param string $source
	 *
	 * @return string
	 */
	private static function _removeAllButCode( $source )
	{
		$commentTokens    = array(
			T_COMMENT => true, T_INLINE_HTML => true, T_DOC_COMMENT => true
		);
		$whiteSpaceTokens = array(
			T_WHITESPACE => true, T_CLOSE_TAG => true,
			T_OPEN_TAG   => true, T_OPEN_TAG_WITH_ECHO => true,
		);

		$cleanedSource = '';
		foreach ( token_get_all( $source ) as $token ) {
			if ( is_array( $token ) ) {
				if ( isset( $commentTokens[ $token[0] ] ) ) continue;

				if ( isset( $whiteSpaceTokens[ $token[0] ] ) ) {
					$token = "\x07";
				} else {
					$token = $token[1];
				}
			} elseif ( $token === ';' ) {
				$token = "\x07";
			}

			$cleanedSource .= $token;
		}
		return $cleanedSource;
	}

	/**
	 * returns whether current trace step belongs to Kint or its wrappers
	 *
	 * @param $step
	 *
	 * @return array
	 */
	private static function _stepIsInternal( $step )
	{
		if ( isset( $step['class'] ) ) {
			foreach ( self::$aliases['methods'] as $alias ) {
				if ( $alias[0] === strtolower( $step['class'] ) && $alias[1] === strtolower( $step['function'] ) ) {
					return true;
				}
			}
			return false;
		} else {
			return in_array( strtolower( $step['function'] ), self::$aliases['functions'], true );
		}
	}

	private static function _parseTrace( array $data )
	{
		$trace       = array();
		$traceFields = array( 'file', 'line', 'args', 'class' );
		$fileFound   = false; # file element must exist in one of the steps

		# validate whether a trace was indeed passed
		while ( $step = array_pop( $data ) ) {
			if ( !is_array( $step ) || !isset( $step['function'] ) ) return false;
			if ( !$fileFound && isset( $step['file'] ) && file_exists( $step['file'] ) ) {
				$fileFound = true;
			}

			$valid = false;
			foreach ( $traceFields as $element ) {
				if ( isset( $step[ $element ] ) ) {
					$valid = true;
					break;
				}
			}
			if ( !$valid ) return false;

			if ( self::_stepIsInternal( $step ) ) {
				$step = array(
					'file'     => $step['file'],
					'line'     => $step['line'],
					'function' => '',
				);
				array_unshift( $trace, $step );
				break;
			}
			if ( $step['function'] !== 'spl_autoload_call' ) { # meaningless
				array_unshift( $trace, $step );
			}
		}
		if ( !$fileFound ) return false;

		$output = array();
		foreach ( $trace as $step ) {
			if ( isset( $step['file'] ) ) {
				$file = $step['file'];

				if ( isset( $step['line'] ) ) {
					$line = $step['line'];
					# include the source of this step
					if ( self::enabled() === self::MODE_RICH ) {
						$source = self::_showSource( $file, $line );
					}
				}
			}

			$function = $step['function'];

			if ( in_array( $function, array( 'include', 'include_once', 'require', 'require_once' ) ) ) {
				if ( empty( $step['args'] ) ) {
					# no arguments
					$args = array();
				} else {
					# sanitize the included file path
					$args = array( 'file' => self::shortenPath( $step['args'][0] ) );
				}
			} elseif ( isset( $step['args'] ) ) {
				if ( empty( $step['class'] ) && !function_exists( $function ) ) {
					# introspection on closures or language constructs in a stack trace is impossible before PHP 5.3
					$params = null;
				} else {
					try {
						if ( isset( $step['class'] ) ) {
							if ( method_exists( $step['class'], $function ) ) {
								$reflection = new ReflectionMethod( $step['class'], $function );
							} else if ( isset( $step['type'] ) && $step['type'] == '::' ) {
								$reflection = new ReflectionMethod( $step['class'], '__callStatic' );
							} else {
								$reflection = new ReflectionMethod( $step['class'], '__call' );
							}
						} else {
							$reflection = new ReflectionFunction( $function );
						}

						# get the function parameters
						$params = $reflection->getParameters();
					} catch ( Exception $e ) { # avoid various PHP version incompatibilities
						$params = null;
					}
				}

				$args = array();
				foreach ( $step['args'] as $i => $arg ) {
					if ( isset( $params[ $i ] ) ) {
						# assign the argument by the parameter name
						$args[ $params[ $i ]->name ] = $arg;
					} else {
						# assign the argument by number
						$args[ '#' . ( $i + 1 ) ] = $arg;
					}
				}
			}

			if ( isset( $step['class'] ) ) {
				# Class->method() or Class::method()
				$function = $step['class'] . $step['type'] . $function;
			}

			// todo it's possible to parse the object name out from the source!
			$output[] = array(
				'function' => $function,
				'args'     => isset( $args ) ? $args : null,
				'file'     => isset( $file ) ? $file : null,
				'line'     => isset( $line ) ? $line : null,
				'source'   => isset( $source ) ? $source : null,
				'object'   => isset( $step['object'] ) ? $step['object'] : null,
			);

			unset( $function, $args, $file, $line, $source );
		}

		return $output;
	}
}


if ( !function_exists( 'd' ) ) {
	/**
	 * Alias of Kint::dump()
	 *
	 * @return string
	 */
	function d()
	{
		if ( !Kint::enabled() ) return '';
		$_ = func_get_args();
		return call_user_func_array( array( 'Kint', 'dump' ), $_ );
	}
}

if ( !function_exists( 'dd' ) ) {
	/**
	 * Alias of Kint::dump()
	 * [!!!] IMPORTANT: execution will halt after call to this function
	 *
	 * @return string
	 * @deprecated
	 */
	function dd()
	{
		if ( !Kint::enabled() ) return '';

		echo "<pre>Kint: dd() is being deprecated, please use ddd() instead</pre>\n";
		$_ = func_get_args();
		call_user_func_array( array( 'Kint', 'dump' ), $_ );
		die;
	}
}

if ( !function_exists( 'ddd' ) ) {
	/**
	 * Alias of Kint::dump()
	 * [!!!] IMPORTANT: execution will halt after call to this function
	 *
	 * @return string
	 */
	function ddd()
	{
		if ( !Kint::enabled() ) return '';
		$_ = func_get_args();
		call_user_func_array( array( 'Kint', 'dump' ), $_ );
		die;
	}
}

if ( !function_exists( 's' ) ) {
	/**
	 * Alias of Kint::dump(), however the output is in plain htmlescaped text and some minor visibility enhancements
	 * added. If run in CLI mode, output is pure whitespace.
	 *
	 * To force rendering mode without autodetecting anything:
	 *
	 *  Kint::enabled( Kint::MODE_PLAIN );
	 *  Kint::dump( $variable );
	 *
	 * [!!!] IMPORTANT: execution will halt after call to this function
	 *
	 * @return string
	 */
	function s()
	{
		$enabled = Kint::enabled();
		if ( !$enabled ) return '';

		if ( $enabled === Kint::MODE_WHITESPACE ) { # if already in whitespace, don't elevate to plain
			$restoreMode = Kint::MODE_WHITESPACE;
		} else {
			$restoreMode = Kint::enabled( # remove cli colors in cli mode; remove rich interface in HTML mode
				PHP_SAPI === 'cli' ? Kint::MODE_WHITESPACE : Kint::MODE_PLAIN
			);
		}

		$params = func_get_args();
		$dump   = call_user_func_array( array( 'Kint', 'dump' ), $params );
		Kint::enabled( $restoreMode );
		return $dump;
	}
}

if ( !function_exists( 'sd' ) ) {
	/**
	 * @see s()
	 *
	 * [!!!] IMPORTANT: execution will halt after call to this function
	 *
	 * @return string
	 */
	function sd()
	{
		$enabled = Kint::enabled();
		if ( !$enabled ) return '';

		if ( $enabled !== Kint::MODE_WHITESPACE ) {
			Kint::enabled(
				PHP_SAPI === 'cli' ? Kint::MODE_WHITESPACE : Kint::MODE_PLAIN
			);
		}

		$params = func_get_args();
		call_user_func_array( array( 'Kint', 'dump' ), $params );
		die;
	}
}