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<?php
/* Copyright (c)
* - 2006-2013, Ivan Sagalaev (maniac@softwaremaniacs.org), highlight.js
* (original author)
* - 2013-2019, Geert Bergman (geert@scrivo.nl), highlight.php
* - 2014 Daniel Lynge, highlight.php (contributor)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of "highlight.js", "highlight.php", nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
namespace Highlight;
/**
* @api
*
* @since 7.5.0.0
*/
class Highlighter
{
/**
* @since 9.12.0.4
*/
const SPAN_END_TAG = "</span>";
/** @var bool */
private $safeMode = true;
// @TODO In v10.x, this value should be static to match highlight.js behavior
/** @var array<string, mixed> */
private $options;
/** @var string */
private $modeBuffer = "";
/** @var string */
private $result = "";
/** @var Mode|null */
private $top = null;
/** @var Language|null */
private $language = null;
/** @var int */
private $relevance = 0;
/** @var bool */
private $ignoreIllegals = false;
/** @var array<string, Mode> */
private $continuations = array();
/** @var RegExMatch */
private $lastMatch;
/** @var string The current code we are highlighting */
private $codeToHighlight;
/** @var string[] A list of all the bundled languages */
private static $bundledLanguages = array();
/** @var array<string, Language> A mapping of a language ID to a Language definition */
private static $classMap = array();
/** @var string[] A list of registered language IDs */
private static $languages = array();
/** @var array<string, string> A mapping from alias (key) to main language ID (value) */
private static $aliases = array();
/**
* @param bool $loadAllLanguages If true, will automatically register all languages distributed with this library.
* If false, user must explicitly register languages by calling `registerLanguage()`.
*
* @since 9.18.1.4 added `$loadAllLanguages` parameter
* @see Highlighter::registerLanguage()
*/
public function __construct($loadAllLanguages = true)
{
$this->lastMatch = new RegExMatch(array());
$this->lastMatch->type = "";
$this->lastMatch->rule = null;
// @TODO In v10.x, remove the default value for the `languages` value to follow highlight.js behavior
$this->options = array(
'classPrefix' => 'hljs-',
'tabReplace' => null,
'useBR' => false,
'languages' => array(
"xml", "json", "javascript", "css", "php", "http",
),
);
if ($loadAllLanguages) {
self::registerAllLanguages();
}
}
/**
* Return a list of all available languages bundled with this library.
*
* @since 9.18.1.4
*
* @return string[] An array of language names
*/
public static function listBundledLanguages()
{
if (!empty(self::$bundledLanguages)) {
return self::$bundledLanguages;
}
// Languages that take precedence in the classMap array. (I don't know why...)
$bundledLanguages = array(
"xml" => true,
"django" => true,
"javascript" => true,
"matlab" => true,
"cpp" => true,
);
$languagePath = __DIR__ . '/languages/';
$d = @dir($languagePath);
if (!$d) {
throw new \RuntimeException('Could not read bundled language definition directory.');
}
// @TODO In 10.x, rewrite this as a generator yielding results
while (($entry = $d->read()) !== false) {
if (substr($entry, -5) === ".json") {
$languageId = substr($entry, 0, -5);
$filePath = $languagePath . $entry;
if (is_readable($filePath)) {
$bundledLanguages[$languageId] = true;
}
}
}
$d->close();
return self::$bundledLanguages = array_keys($bundledLanguages);
}
/**
* Return a list of all the registered languages. Using this list in
* setAutodetectLanguages will turn on auto-detection for all supported
* languages.
*
* @since 9.18.1.4
*
* @param bool $includeAliases Specify whether language aliases should be
* included as well
*
* @return string[] An array of language names
*/
public static function listRegisteredLanguages($includeAliases = false)
{
if ($includeAliases === true) {
return array_merge(self::$languages, array_keys(self::$aliases));
}
return self::$languages;
}
/**
* Register all 185+ languages that are bundled in this library.
*
* To register languages individually, use `registerLanguage`.
*
* @since 9.18.1.4 Method is now public
* @since 8.3.0.0
* @see Highlighter::registerLanguage
*
* @return void
*/
public static function registerAllLanguages()
{
// Languages that take precedence in the classMap array.
$languagePath = __DIR__ . DIRECTORY_SEPARATOR . "languages" . DIRECTORY_SEPARATOR;
foreach (array("xml", "django", "javascript", "matlab", "cpp") as $languageId) {
$filePath = $languagePath . $languageId . ".json";
if (is_readable($filePath)) {
self::registerLanguage($languageId, $filePath);
}
}
// @TODO In 10.x, call `listBundledLanguages()` instead when it's a generator
$d = @dir($languagePath);
if ($d) {
while (($entry = $d->read()) !== false) {
if (substr($entry, -5) === ".json") {
$languageId = substr($entry, 0, -5);
$filePath = $languagePath . $entry;
if (is_readable($filePath)) {
self::registerLanguage($languageId, $filePath);
}
}
}
$d->close();
}
}
/**
* Register a language definition with the Highlighter's internal language
* storage. Languages are stored in a static variable, so they'll be available
* across all instances. You only need to register a language once.
*
* @param string $languageId The unique name of a language
* @param string $filePath The file path to the language definition
* @param bool $overwrite Overwrite language if it already exists
*
* @return Language The object containing the definition for a language's markup
*/
public static function registerLanguage($languageId, $filePath, $overwrite = false)
{
if (!isset(self::$classMap[$languageId]) || $overwrite) {
$lang = new Language($languageId, $filePath);
self::$classMap[$languageId] = $lang;
self::$languages[] = $languageId;
self::$languages = array_unique(self::$languages);
if ($lang->aliases) {
foreach ($lang->aliases as $alias) {
self::$aliases[$alias] = $languageId;
}
}
}
return self::$classMap[$languageId];
}
/**
* Clear all registered languages.
*
* @since 9.18.1.4
*
* @return void
*/
public static function clearAllLanguages()
{
self::$classMap = array();
self::$languages = array();
self::$aliases = array();
}
/**
* @param RegEx|null $re
* @param string $lexeme
*
* @return bool
*/
private function testRe($re, $lexeme)
{
if (!$re) {
return false;
}
$lastIndex = $re->lastIndex;
$result = $re->exec($lexeme);
$re->lastIndex = $lastIndex;
return $result && $result->index === 0;
}
/**
* @param string $value
*
* @return RegEx
*/
private function escapeRe($value)
{
return new RegEx(sprintf('/%s/um', preg_quote($value)));
}
/**
* @param Mode $mode
* @param string $lexeme
*
* @return Mode|null
*/
private function endOfMode($mode, $lexeme)
{
if ($this->testRe($mode->endRe, $lexeme)) {
while ($mode->endsParent && $mode->parent) {
$mode = $mode->parent;
}
return $mode;
}
if ($mode->endsWithParent) {
return $this->endOfMode($mode->parent, $lexeme);
}
return null;
}
/**
* @param Mode $mode
* @param RegExMatch $match
*
* @return mixed|null
*/
private function keywordMatch($mode, $match)
{
$kwd = $this->language->case_insensitive ? mb_strtolower($match[0], "UTF-8") : $match[0];
return isset($mode->keywords[$kwd]) ? $mode->keywords[$kwd] : null;
}
/**
* @param string $className
* @param string $insideSpan
* @param bool $leaveOpen
* @param bool $noPrefix
*
* @return string
*/
private function buildSpan($className, $insideSpan, $leaveOpen = false, $noPrefix = false)
{
if (!$leaveOpen && $insideSpan === '') {
return '';
}
if (!$className) {
return $insideSpan;
}
$classPrefix = $noPrefix ? "" : $this->options['classPrefix'];
$openSpan = "<span class=\"" . $classPrefix;
$closeSpan = $leaveOpen ? "" : self::SPAN_END_TAG;
$openSpan .= $className . "\">";
return $openSpan . $insideSpan . $closeSpan;
}
/**
* @param string $value
*
* @return string
*/
private function escape($value)
{
return htmlspecialchars($value, ENT_NOQUOTES);
}
/**
* @return string
*/
private function processKeywords()
{
if (!$this->top->keywords) {
return $this->escape($this->modeBuffer);
}
$result = "";
$lastIndex = 0;
$this->top->lexemesRe->lastIndex = 0;
$match = $this->top->lexemesRe->exec($this->modeBuffer);
while ($match) {
$result .= $this->escape(substr($this->modeBuffer, $lastIndex, $match->index - $lastIndex));
$keyword_match = $this->keywordMatch($this->top, $match);
if ($keyword_match) {
$this->relevance += $keyword_match[1];
$result .= $this->buildSpan($keyword_match[0], $this->escape($match[0]));
} else {
$result .= $this->escape($match[0]);
}
$lastIndex = $this->top->lexemesRe->lastIndex;
$match = $this->top->lexemesRe->exec($this->modeBuffer);
}
return $result . $this->escape(substr($this->modeBuffer, $lastIndex));
}
/**
* @return string
*/
private function processSubLanguage()
{
try {
$hl = new Highlighter();
// @TODO in v10.x, this should no longer be necessary once `$options` is made static
$hl->setAutodetectLanguages($this->options['languages']);
$hl->setClassPrefix($this->options['classPrefix']);
$hl->setTabReplace($this->options['tabReplace']);
if (!$this->safeMode) {
$hl->disableSafeMode();
}
$explicit = is_string($this->top->subLanguage);
if ($explicit && !in_array($this->top->subLanguage, self::$languages)) {
return $this->escape($this->modeBuffer);
}
if ($explicit) {
$res = $hl->highlight(
$this->top->subLanguage,
$this->modeBuffer,
true,
isset($this->continuations[$this->top->subLanguage]) ? $this->continuations[$this->top->subLanguage] : null
);
} else {
$res = $hl->highlightAuto(
$this->modeBuffer,
count($this->top->subLanguage) ? $this->top->subLanguage : null
);
}
// Counting embedded language score towards the host language may be disabled
// with zeroing the containing mode relevance. Use case in point is Markdown that
// allows XML everywhere and makes every XML snippet to have a much larger Markdown
// score.
if ($this->top->relevance > 0) {
$this->relevance += $res->relevance;
}
if ($explicit) {
$this->continuations[$this->top->subLanguage] = $res->top;
}
return $this->buildSpan($res->language, $res->value, false, true);
} catch (\Exception $e) {
return $this->escape($this->modeBuffer);
}
}
/**
* @return void
*/
private function processBuffer()
{
if (is_object($this->top) && $this->top->subLanguage) {
$this->result .= $this->processSubLanguage();
} else {
$this->result .= $this->processKeywords();
}
$this->modeBuffer = '';
}
/**
* @param Mode $mode
*
* @return void
*/
private function startNewMode($mode)
{
$this->result .= $mode->className ? $this->buildSpan($mode->className, "", true) : "";
$t = clone $mode;
$t->parent = $this->top;
$this->top = $t;
}
/**
* @param RegExMatch $match
*
* @return int
*/
private function doBeginMatch($match)
{
$lexeme = $match[0];
$newMode = $match->rule;
if ($newMode && $newMode->endSameAsBegin) {
$newMode->endRe = $this->escapeRe($lexeme);
}
if ($newMode->skip) {
$this->modeBuffer .= $lexeme;
} else {
if ($newMode->excludeBegin) {
$this->modeBuffer .= $lexeme;
}
$this->processBuffer();
if (!$newMode->returnBegin && !$newMode->excludeBegin) {
$this->modeBuffer = $lexeme;
}
}
$this->startNewMode($newMode);
return $newMode->returnBegin ? 0 : strlen($lexeme);
}
/**
* @param RegExMatch $match
*
* @return int|null
*/
private function doEndMatch($match)
{
$lexeme = $match[0];
$matchPlusRemainder = substr($this->codeToHighlight, $match->index);
$endMode = $this->endOfMode($this->top, $matchPlusRemainder);
if (!$endMode) {
return null;
}
$origin = $this->top;
if ($origin->skip) {
$this->modeBuffer .= $lexeme;
} else {
if (!($origin->returnEnd || $origin->excludeEnd)) {
$this->modeBuffer .= $lexeme;
}
$this->processBuffer();
if ($origin->excludeEnd) {
$this->modeBuffer = $lexeme;
}
}
do {
if ($this->top->className) {
$this->result .= self::SPAN_END_TAG;
}
if (!$this->top->skip && !$this->top->subLanguage) {
$this->relevance += $this->top->relevance;
}
$this->top = $this->top->parent;
} while ($this->top !== $endMode->parent);
if ($endMode->starts) {
if ($endMode->endSameAsBegin) {
$endMode->starts->endRe = $endMode->endRe;
}
$this->startNewMode($endMode->starts);
}
return $origin->returnEnd ? 0 : strlen($lexeme);
}
/**
* @param string $textBeforeMatch
* @param RegExMatch|null $match
*
* @return int
*/
private function processLexeme($textBeforeMatch, $match = null)
{
$lexeme = $match ? $match[0] : null;
// add non-matched text to the current mode buffer
$this->modeBuffer .= $textBeforeMatch;
if ($lexeme === null) {
$this->processBuffer();
return 0;
}
// we've found a 0 width match and we're stuck, so we need to advance
// this happens when we have badly behaved rules that have optional matchers to the degree that
// sometimes they can end up matching nothing at all
// Ref: https://github.com/highlightjs/highlight.js/issues/2140
if ($this->lastMatch->type === "begin" && $match->type === "end" && $this->lastMatch->index === $match->index && $lexeme === "") {
// spit the "skipped" character that our regex choked on back into the output sequence
$this->modeBuffer .= substr($this->codeToHighlight, $match->index, 1);
return 1;
}
$this->lastMatch = $match;
if ($match->type === "begin") {
return $this->doBeginMatch($match);
} elseif ($match->type === "illegal" && !$this->ignoreIllegals) {
// illegal match, we do not continue processing
$_modeRaw = isset($this->top->className) ? $this->top->className : "<unnamed>";
throw new \UnexpectedValueException("Illegal lexeme \"$lexeme\" for mode \"$_modeRaw\"");
} elseif ($match->type === "end") {
$processed = $this->doEndMatch($match);
if ($processed !== null) {
return $processed;
}
}
// Why might be find ourselves here? Only one occasion now. An end match that was
// triggered but could not be completed. When might this happen? When an `endSameasBegin`
// rule sets the end rule to a specific match. Since the overall mode termination rule that's
// being used to scan the text isn't recompiled that means that any match that LOOKS like
// the end (but is not, because it is not an exact match to the beginning) will
// end up here. A definite end match, but when `doEndMatch` tries to "reapply"
// the end rule and fails to match, we wind up here, and just silently ignore the end.
//
// This causes no real harm other than stopping a few times too many.
$this->modeBuffer .= $lexeme;
return strlen($lexeme);
}
/**
* Replace tabs for something more usable.
*
* @param string $code
*
* @return string
*/
private function replaceTabs($code)
{
if ($this->options['tabReplace'] !== null) {
return str_replace("\t", $this->options['tabReplace'], $code);
}
return $code;
}
/**
* Set the languages that will used for auto-detection. When using auto-
* detection the code to highlight will be probed for every language in this
* set. Limiting this set to only the languages you want to use will greatly
* improve highlighting speed.
*
* @param string[] $set An array of language games to use for autodetection.
* This defaults to a typical set Web development
* languages.
*
* @return void
*/
public function setAutodetectLanguages(array $set)
{
$this->options['languages'] = array_unique($set);
}
/**
* Get the tab replacement string.
*
* @return string The tab replacement string
*/
public function getTabReplace()
{
return $this->options['tabReplace'];
}
/**
* Set the tab replacement string. This defaults to NULL: no tabs
* will be replaced.
*
* @param string $tabReplace The tab replacement string
*
* @return void
*/
public function setTabReplace($tabReplace)
{
$this->options['tabReplace'] = $tabReplace;
}
/**
* Get the class prefix string.
*
* @return string The class prefix string
*/
public function getClassPrefix()
{
return $this->options['classPrefix'];
}
/**
* Set the class prefix string.
*
* @param string $classPrefix The class prefix string
*
* @return void
*/
public function setClassPrefix($classPrefix)
{
$this->options['classPrefix'] = $classPrefix;
}
/**
* @since 9.17.1.0
*
* @return void
*/
public function enableSafeMode()
{
$this->safeMode = true;
}
/**
* @since 9.17.1.0
*
* @return void
*/
public function disableSafeMode()
{
$this->safeMode = false;
}
/**
* @param string $name
*
* @return Language|null
*/
private function getLanguage($name)
{
if (isset(self::$classMap[$name])) {
return self::$classMap[$name];
} elseif (isset(self::$aliases[$name]) && isset(self::$classMap[self::$aliases[$name]])) {
return self::$classMap[self::$aliases[$name]];
}
return null;
}
/**
* Determine whether or not a language definition supports auto detection.
*
* @param string $name Language name
*
* @return bool
*/
private function autoDetection($name)
{
$lang = $this->getLanguage($name);
return $lang && !$lang->disableAutodetect;
}
/**
* Core highlighting function. Accepts a language name, or an alias, and a
* string with the code to highlight. Returns an object with the following
* properties:
* - relevance (int)
* - value (an HTML string with highlighting markup).
*
* @todo In v10.x, change the return type from \stdClass to HighlightResult
*
* @param string $languageName
* @param string $code
* @param bool $ignoreIllegals
* @param Mode|null $continuation
*
* @throws \DomainException if the requested language was not in this
* Highlighter's language set
* @throws \Exception if an invalid regex was given in a language file
*
* @return HighlightResult|\stdClass
*/
public function highlight($languageName, $code, $ignoreIllegals = true, $continuation = null)
{
$this->codeToHighlight = $code;
$this->language = $this->getLanguage($languageName);
if ($this->language === null) {
throw new \DomainException("Unknown language: \"$languageName\"");
}
$this->language->compile($this->safeMode);
$this->top = $continuation ? $continuation : $this->language;
$this->continuations = array();
$this->result = "";
for ($current = $this->top; $current !== $this->language; $current = $current->parent) {
if ($current->className) {
$this->result = $this->buildSpan($current->className, '', true) . $this->result;
}
}
$this->modeBuffer = "";
$this->relevance = 0;
$this->ignoreIllegals = $ignoreIllegals;
/** @var HighlightResult $res */
$res = new \stdClass();
$res->relevance = 0;
$res->value = "";
$res->language = "";
$res->top = null;
$res->errorRaised = null;
try {
$match = null;
$count = 0;
$index = 0;
while ($this->top) {
$this->top->terminators->lastIndex = $index;
$match = $this->top->terminators->exec($this->codeToHighlight);
if (!$match) {
break;
}
$count = $this->processLexeme(substr($this->codeToHighlight, $index, $match->index - $index), $match);
$index = $match->index + $count;
}
$this->processLexeme(substr($this->codeToHighlight, $index));
for ($current = $this->top; isset($current->parent); $current = $current->parent) {
if ($current->className) {
$this->result .= self::SPAN_END_TAG;
}
}
$res->relevance = $this->relevance;
$res->value = $this->replaceTabs($this->result);
$res->illegal = false;
$res->language = $this->language->name;
$res->top = $this->top;
return $res;
} catch (\Exception $e) {
if (strpos($e->getMessage(), "Illegal") !== false) {
$res->illegal = true;
$res->relevance = 0;
$res->value = $this->escape($this->codeToHighlight);
return $res;
} elseif ($this->safeMode) {
$res->relevance = 0;
$res->value = $this->escape($this->codeToHighlight);
$res->language = $languageName;
$res->top = $this->top;
$res->errorRaised = $e;
return $res;
}
throw $e;
}
}
/**
* Highlight the given code by highlighting the given code with each
* registered language and then finding the match with highest accuracy.
*
* @param string $code
* @param string[]|null $languageSubset When set to null, this method will attempt to highlight $text with each
* language. Set this to an array of languages of your choice to limit the
* amount of languages to try.
*
* @throws \Exception if an invalid regex was given in a language file
* @throws \DomainException if the attempted language to check does not exist
*
* @return HighlightResult|\stdClass
*/
public function highlightAuto($code, $languageSubset = null)
{
/** @var HighlightResult $result */
$result = new \stdClass();
$result->relevance = 0;
$result->value = $this->escape($code);
$result->language = "";
$secondBest = clone $result;
if ($languageSubset === null) {
$optionsLanguages = $this->options['languages'];
if (is_array($optionsLanguages) && count($optionsLanguages) > 0) {
$languageSubset = $optionsLanguages;
} else {
$languageSubset = self::$languages;
}
}
foreach ($languageSubset as $name) {
if ($this->getLanguage($name) === null || !$this->autoDetection($name)) {
continue;
}
$current = $this->highlight($name, $code, false);
if ($current->relevance > $secondBest->relevance) {
$secondBest = $current;
}
if ($current->relevance > $result->relevance) {
$secondBest = $result;
$result = $current;
}
}
if ($secondBest->language) {
$result->secondBest = $secondBest;
}
return $result;
}
/**
* Return a list of all supported languages. Using this list in
* setAutodetectLanguages will turn on autodetection for all supported
* languages.
*
* @deprecated use `Highlighter::listRegisteredLanguages()` or `Highlighter::listBundledLanguages()` instead
*
* @param bool $include_aliases specify whether language aliases
* should be included as well
*
* @since 9.18.1.4 Deprecated in favor of `Highlighter::listRegisteredLanguages()`
* and `Highlighter::listBundledLanguages()`.
* @since 9.12.0.3 The `$include_aliases` parameter was added
* @since 8.3.0.0
*
* @return string[] An array of language names
*/
public function listLanguages($include_aliases = false)
{
@trigger_error('This method is deprecated in favor `Highlighter::listRegisteredLanguages()` or `Highlighter::listBundledLanguages()`. This function will be removed in highlight.php 10.', E_USER_DEPRECATED);
if (empty(self::$languages)) {
trigger_error('No languages are registered, returning all bundled languages instead. You probably did not want this.', E_USER_WARNING);
return self::listBundledLanguages();
}
if ($include_aliases === true) {
return array_merge(self::$languages, array_keys(self::$aliases));
}
return self::$languages;
}
/**
* Returns list of all available aliases for given language name.
*
* @param string $name name or alias of language to look-up
*
* @throws \DomainException if the requested language was not in this
* Highlighter's language set
*
* @since 9.12.0.3
*
* @return string[] An array of all aliases associated with the requested
* language name language. Passed-in name is included as
* well.
*/
public function getAliasesForLanguage($name)
{
$language = self::getLanguage($name);
if ($language === null) {
throw new \DomainException("Unknown language: $language");
}
if ($language->aliases === null) {
return array($language->name);
}
return array_merge(array($language->name), $language->aliases);
}
}