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<?php |
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/* @description Transformation Style Sheets - Revolutionising PHP templating * |
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* @author Tom Butler [email protected] * |
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* @copyright 2015 Tom Butler <[email protected]> | https://r.je/ * |
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License * |
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* @version 1.0 */ |
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namespace Transphporm\Parser; |
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class Tokenizer { |
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private $str; |
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const NAME = 1; |
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const STRING = 2; |
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const STRING2 = 3; |
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const OPEN_BRACKET = 4; |
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const CLOSE_BRACKET = 5; |
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const OPEN_SQUARE_BRACKET = 6; |
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const CLOSE_SQUARE_BRACKET = 7; |
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const CONCAT = 8; |
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const ARG = 9; |
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const WHITESPACE = 10; |
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const DOT = 11; |
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const NUMERIC = 12; |
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const EQUALS = 13; |
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const NOT = 14; |
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const OPEN_BRACE = 15; |
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const CLOSE_BRACE = 16; |
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const BOOL = 17; |
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public $chars = [ |
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'"' => self::STRING, |
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'\'' => self::STRING2, |
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'(' => self::OPEN_BRACKET, |
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')' => self::CLOSE_BRACKET, |
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'[' => self::OPEN_SQUARE_BRACKET, |
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']' => self::CLOSE_SQUARE_BRACKET, |
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'+' => self::CONCAT, |
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',' => self::ARG, |
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'.' => self::DOT, |
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'!' => self::NOT, |
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'=' => self::EQUALS, |
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'{' => self::OPEN_BRACE, |
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'}' => self::CLOSE_BRACE, |
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' ' => self::WHITESPACE, |
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"\n" => self::WHITESPACE, |
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"\r" => self::WHITESPACE, |
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"\t" => self::WHITESPACE |
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]; |
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public function __construct($str) { |
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$this->str = $str; |
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} |
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public function getTokens() { |
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$tokens = []; |
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for ($i = 0; $i < strlen($this->str); $i++) { |
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$char = $this->identifyChar($this->str[$i]); |
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$this->doSimpleTokens($tokens, $char); |
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$this->doLiterals($tokens, $char, $i); |
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$i += $this->doStrings($tokens, $char, $i); |
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$i += $this->doBrackets($tokens, $char, $i); |
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} |
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return $tokens; |
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} |
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private function doSimpleTokens(&$tokens, $char) { |
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if (in_array($char, [Tokenizer::ARG, Tokenizer::CONCAT, Tokenizer::DOT, Tokenizer::NOT, Tokenizer::EQUALS])) { |
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$tokens[] = ['type' => $char]; |
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} |
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} |
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private function doLiterals(&$tokens, $char, &$i) { |
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if ($char === self::NAME) { |
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$name = $this->str[$i]; |
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while (isset($this->str[$i+1]) && $this->identifyChar($this->str[$i+1]) == self::NAME) { |
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$name .= $this->str[$i+1]; |
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$i++; |
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} |
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$this->processLiterals($tokens, $name); |
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} |
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} |
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private function processLiterals(&$tokens, $name) { |
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if (is_numeric($name)) $tokens[] = ['type' => self::NUMERIC, 'value' => $name]; |
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else if ($name == 'true') $tokens[] = ['type' => self::BOOL, 'value' => true]; |
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else if ($name == 'false') $tokens[] = ['type' => self::BOOL, 'value' => false]; |
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else $tokens[] = ['type' => self::NAME, 'value' => $name]; |
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} |
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private function doBrackets(&$tokens, $char, $i) { |
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$types = [ |
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self::OPEN_BRACKET => ['(', ')'], |
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self::OPEN_BRACE => ['{', '}'], |
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self::OPEN_SQUARE_BRACKET => ['[', ']'] |
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]; |
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foreach ($types as $type => $brackets) { |
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if ($char === $type) { |
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$contents = $this->extractBrackets($i, $brackets[0], $brackets[1]); |
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$tokenizer = new Tokenizer($contents); |
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$tokens[] = ['type' => $type, 'value' => $tokenizer->getTokens()]; |
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return strlen($contents); |
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} |
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} |
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} |
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private function doStrings(&$tokens, $char, $i) { |
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if (in_array($char, [self::STRING, self::STRING2])) { |
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$string = $this->extractString($i); |
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$length = strlen($string)+1; |
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$char = $this->getChar($char); |
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$string = str_replace('\\' . $char, $char, $string); |
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$tokens[] = ['type' => self::STRING, 'value' => $string]; |
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return $length; |
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} |
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} |
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private function extractString($pos) { |
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$char = $this->str[$pos]; |
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$end = strpos($this->str, $char, $pos+1); |
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while ($end !== false && $this->str[$end-1] == '\\') $end = strpos($this->str, $char, $end+1); |
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return substr($this->str, $pos+1, $end-$pos-1); |
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} |
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private function extractBrackets($open, $startBracket = '(', $closeBracket = ')') { |
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$close = strpos($this->str, $closeBracket, $open); |
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$cPos = $open+1; |
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while (($cPos = strpos($this->str, $startBracket, $cPos+1)) !== false && $cPos < $close) $close = strpos($this->str, $closeBracket, $close+1); |
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return substr($this->str, $open+1, $close-$open-1); |
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} |
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private function identifyChar($chr) { |
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if (isset($this->chars[$chr])) return $this->chars[$chr]; |
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else return self::NAME; |
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} |
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private function getChar($num) { |
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$chars = array_reverse($this->chars); |
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if (isset($chars[$num])) return $chars[$num]; |
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else return false; |
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} |
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} |
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Level-2 /
Transphporm
