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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 2017 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 1.2 */ |
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namespace Transphporm\Parser; |
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/** Parses "string" and function(args) e.g. data(foo) or iteration(bar) */ |
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class Value { |
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private $baseData; |
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private $autoLookup; |
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/* |
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Stores the last value e.g. |
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"a" + "b" |
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Will store "a" before reading the token for the + and perfoming the concatenate operation |
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*/ |
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private $last; |
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private $data; |
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private $result; |
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private $traversing = false; |
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private $allowNullResult = false; |
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private $tokenFuncs = [ |
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Tokenizer::NOT => 'processComparator', |
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Tokenizer::EQUALS => 'processComparator', |
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Tokenizer::DOT => 'processDot', |
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Tokenizer::OPEN_SQUARE_BRACKET => 'processSquareBracket', |
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Tokenizer::ARG => 'processSeparator', |
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Tokenizer::CONCAT => 'processSeparator', |
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Tokenizer::SUBTRACT => 'processSeparator', |
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Tokenizer::MULTIPLY => 'processSeparator', |
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Tokenizer::DIVIDE => 'processSeparator', |
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Tokenizer::NAME => 'processScalar', |
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Tokenizer::NUMERIC => 'processString', |
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Tokenizer::BOOL => 'processString', |
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Tokenizer::STRING => 'processString', |
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Tokenizer::OPEN_BRACKET => 'processBrackets', |
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Tokenizer::GREATER_THAN => 'processComparator', |
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Tokenizer::LOWER_THAN => 'processComparator', |
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Tokenizer::IN => 'processComparator' |
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]; |
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public function __construct($data, $autoLookup = false, $allowNullResult = false) { |
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$this->baseData = $data; |
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$this->autoLookup = $autoLookup; |
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$this->allowNullResult = $allowNullResult; |
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} |
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public function parse($str) { |
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$tokenizer = new Tokenizer($str); |
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$tokens = $tokenizer->getTokens(); |
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$this->result = $this->parseTokens($tokens, $this->baseData); |
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return $this->result; |
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} |
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public function parseTokens($tokens, $data = null) { |
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if (count($tokens) === 0) return [$data]; |
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$this->result = new ValueResult(); |
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$this->data = new ValueData($data ? $data : $this->baseData); |
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$this->last = new Last($this->data, $this->result, $this->autoLookup); |
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$this->traversing = false; |
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foreach ($tokens as $name => $token) { |
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if ($token['type'] == 'WHITESPACE' || $token['type'] == 'NEWLINE') continue; |
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$this->{$this->tokenFuncs[$token['type']]}($token); |
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} |
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$this->last->process(); |
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return $this->result->getResult(); |
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} |
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private function processComparator($token) { |
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$this->allowNullResult = false; |
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$this->last->process(); |
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if (!(in_array($this->result->getMode(), array_keys($this->tokenFuncs, 'processComparator')) && $token['type'] == Tokenizer::EQUALS)) { |
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$this->result->setMode($token['type']); |
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$this->last->clear(); |
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} |
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} |
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//Reads the last selected value from $data regardless if it's an array or object and overrides $this->data with the new value |
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//Dot moves $data to the next object in $data foo.bar moves the $data pointer from `foo` to `bar` |
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private function processDot() { |
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$lastResult = $this->last->traverse(); |
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//When . is not preceeded by anything, treat it as part of the string instead of an operator |
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// foo.bar is treated as looking up `bar` in `foo` whereas .foo is treated as the string ".foo" |
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if ($lastResult) { |
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$this->last->makeTraversing(); |
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} |
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else if ($this->last->isEmpty()) { |
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$this->processString(['value' => '.']); |
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$this->result->setMode(Tokenizer::CONCAT); |
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} |
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$this->last->clear(); |
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} |
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private function hasFunction($name) { |
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return $this->baseData instanceof \Transphporm\Functionset && $this->baseData->hasFunction($name); |
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} |
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private function processSquareBracket($token) { |
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if ($this->hasFunction($this->last->read())) { |
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$this->callTransphpormFunctions($token); |
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} |
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else { |
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$this->last->traverse(); |
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$this->last->set($this->getNewParser()->parseTokens($token['value'], null)[0]); |
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if (!is_bool($this->last->read())) $this->last->makeTraversing(); |
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} |
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} |
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private function processSeparator($token) { |
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$this->result->setMode($token['type']); |
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} |
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private function processScalar($token) { |
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if (is_scalar($this->last->read())) { |
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$this->result->processValue($this->last->read()); |
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} |
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$this->last->set($token['value']); |
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} |
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private function processString($token) { |
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$this->result->processValue($token['value']); |
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} |
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private function processBrackets($token) { |
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if ($this->hasFunction($this->last->read()) |
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&& !$this->data->methodExists($this->last->read())) { |
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$this->callTransphpormFunctions($token); |
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} |
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else { |
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$this->last->processNested($this->getNewParser(), $token); |
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} |
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} |
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private function getNewParser() { |
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return new Value($this->baseData, $this->autoLookup); |
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} |
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private function callTransphpormFunctions($token) { |
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$val = $this->baseData->{$this->last->read()}($token['value']); |
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$this->result->processValue($val); |
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if ($this->autoLookup && is_string($val) && $this->allowNullResult) { |
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$parser = new Value($this->data->getData()); |
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$parsedArr = $parser->parse($val); |
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$parsedVal = isset($parsedArr[0]) ? $parsedArr[0] : null; |
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} |
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else $parsedVal = null; |
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$this->result->postProcess($this->data, $val, $parsedVal, $this->allowNullResult); |
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$this->last->clear(); |
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} |
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} |
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Level-2 /
Transphporm
