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'use strict'
var high = require('highlight.js/lib/core')
var fault = require('fault')
exports.highlight = highlight
exports.highlightAuto = highlightAuto
exports.registerLanguage = registerLanguage
exports.listLanguages = listLanguages
exports.registerAlias = registerAlias
Emitter.prototype.addText = text
Emitter.prototype.addKeyword = addKeyword
Emitter.prototype.addSublanguage = addSublanguage
Emitter.prototype.openNode = open
Emitter.prototype.closeNode = close
Emitter.prototype.closeAllNodes = noop
Emitter.prototype.finalize = noop
Emitter.prototype.toHTML = toHtmlNoop
var defaultPrefix = 'hljs-'
// Highlighting `value` in the language `name`.
function highlight(name, value, options) {
var before = high.configure({})
var settings = options || {}
var prefix = settings.prefix
var result
if (typeof name !== 'string') {
throw fault('Expected `string` for name, got `%s`', name)
}
if (!high.getLanguage(name)) {
throw fault('Unknown language: `%s` is not registered', name)
}
if (typeof value !== 'string') {
throw fault('Expected `string` for value, got `%s`', value)
}
if (prefix === null || prefix === undefined) {
prefix = defaultPrefix
}
high.configure({__emitter: Emitter, classPrefix: prefix})
result = high.highlight(value, {language: name, ignoreIllegals: true})
high.configure(before || {})
/* istanbul ignore if - Highlight.js seems to use this (currently) for broken
* grammars, so let’s keep it in there just to be sure. */
if (result.errorRaised) {
throw result.errorRaised
}
return {
relevance: result.relevance,
language: result.language,
value: result.emitter.rootNode.children
}
}
function highlightAuto(value, options) {
var settings = options || {}
var subset = settings.subset || high.listLanguages()
var prefix = settings.prefix
var length = subset.length
var index = -1
var result
var secondBest
var current
var name
if (prefix === null || prefix === undefined) {
prefix = defaultPrefix
}
if (typeof value !== 'string') {
throw fault('Expected `string` for value, got `%s`', value)
}
secondBest = {relevance: 0, language: null, value: []}
result = {relevance: 0, language: null, value: []}
while (++index < length) {
name = subset[index]
if (!high.getLanguage(name)) {
continue
}
current = highlight(name, value, options)
current.language = name
if (current.relevance > secondBest.relevance) {
secondBest = current
}
if (current.relevance > result.relevance) {
secondBest = result
result = current
}
}
if (secondBest.language) {
result.secondBest = secondBest
}
return result
}
// Register a language.
function registerLanguage(name, syntax) {
high.registerLanguage(name, syntax)
}
// Get a list of all registered languages.
function listLanguages() {
return high.listLanguages()
}
// Register more aliases for an already registered language.
function registerAlias(name, alias) {
var map = name
var key
if (alias) {
map = {}
map[name] = alias
}
for (key in map) {
high.registerAliases(map[key], {languageName: key})
}
}
function Emitter(options) {
this.options = options
this.rootNode = {children: []}
this.stack = [this.rootNode]
}
function addKeyword(value, name) {
this.openNode(name)
this.addText(value)
this.closeNode()
}
function addSublanguage(other, name) {
var stack = this.stack
var current = stack[stack.length - 1]
var results = other.rootNode.children
var node = name
? {
type: 'element',
tagName: 'span',
properties: {className: [name]},
children: results
}
: results
current.children = current.children.concat(node)
}
function text(value) {
var stack = this.stack
var current
var tail
if (value === '') return
current = stack[stack.length - 1]
tail = current.children[current.children.length - 1]
if (tail && tail.type === 'text') {
tail.value += value
} else {
current.children.push({type: 'text', value: value})
}
}
function open(name) {
var stack = this.stack
var className = this.options.classPrefix + name
var current = stack[stack.length - 1]
var child = {
type: 'element',
tagName: 'span',
properties: {className: [className]},
children: []
}
current.children.push(child)
stack.push(child)
}
function close() {
this.stack.pop()
}
function toHtmlNoop() {
return ''
}
function noop() {}