<?php

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/*

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* This file is part of the ManageWP Worker plugin.

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*

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* (c) ManageWP LLC <contact@managewp.com>

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*

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* For the full copyright and license information, please view the LICENSE

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* file that was distributed with this source code.

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*/

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/**

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* A simple parser able to extract 'define' calls with their first constant string, from a PHP source code.

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* Helpful for configuration reading.

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*/

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class MWP_Parser_DefinitionTokenizer

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{

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/**

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* Returns an array of possible 'defined' values.

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*

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* @param string $content Content to parse, PHP code is expected.

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*

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* @return array All the definitions that could be found.

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*/

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public function getDefinitions($content)

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{

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$tokens = token_get_all($content);

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$definitions = array();

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// The parser has 4 phases:

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// 1 - found the 'define' keyword

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// 2 - found an open parentheses '('

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// 3 - found a constant string

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// 0 - (closing the circle) found a comma ','

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$phase = 0;

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$lastDefinition = '';

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foreach ($tokens as $token) {

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if (is_array($token) && ($token[0] === T_WHITESPACE || $token[0] === T_COMMENT || $token[0] === T_DOC_COMMENT)) {

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// Skip whitespace and comment tokens.

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continue;

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}

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if ($phase === 0) {

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// Look for a 'define' function call.

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if (is_array($token) && $token[0] === T_STRING && strtolower($token[1]) === 'define') {

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// This is a 'define' call, move to next phase.

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$phase = 1;

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}

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} elseif ($phase === 1 && $token === '(') {

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// Open parentheses found, move to next phase.

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$phase = 2;

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} elseif ($phase === 2 && is_array($token) && $token[0] === T_CONSTANT_ENCAPSED_STRING) {

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// Constant string found, save it for later

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$lastDefinition = substr($token[1], 1, -1);

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$phase = 3;

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} elseif ($phase === 3 && $token === ',') {

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// Comma found, save the last found constant string, and reset the parser.

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$definitions[] = $lastDefinition;

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$phase = 0;

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} else {

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// Unsupported token found, reset the parser phase.

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$phase = 0;

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}

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}

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return array_unique($definitions);

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}

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public function getDefinitionValues($content)

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{

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$tokens = token_get_all($content);

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$definitions = array();

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$phase = 0;

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$lastDefinition = '';

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$lastValue = '';

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foreach ($tokens as $token) {

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if (is_array($token) && ($token[0] === T_WHITESPACE || $token[0] === T_COMMENT || $token[0] === T_DOC_COMMENT)) {

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// Skip whitespace and comment tokens.

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continue;

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}

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if ($phase === 0) {

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// Look for a 'define' function call.

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if (is_array($token) && $token[0] === T_STRING && strtolower($token[1]) === 'define') {

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// This is a 'define' call, move to next phase.

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$phase = 1;

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}

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} elseif ($phase === 1 && $token === '(') {

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// Open parentheses found, move to next phase.

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$phase = 2;

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} elseif ($phase === 2 && is_array($token) && $token[0] === T_CONSTANT_ENCAPSED_STRING) {

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// Constant string found, save it for later

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$lastDefinition = trim($token[1], '"\'');

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$phase = 3;

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} elseif ($phase === 3 && $token === ',') {

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// Comma found, save the last found constant string.

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$phase = 4;

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} elseif ($phase === 4 && is_array($token) && $token[0] === T_CONSTANT_ENCAPSED_STRING) {

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if (strlen($token[1]) === 2) {

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$lastValue = '';

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} else {

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$lastValue = stripslashes(substr($token[1], 1, -1));

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}

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$phase = 5;

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} elseif ($phase === 5 && $token === ')') {

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$definitions[$lastDefinition] = $lastValue;

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$phase = 0;

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} else {

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// Unsupported token found, reset the parser phase.

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$phase = 0;

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}

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}

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return $definitions;

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}

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}

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