161 lines
3.6 KiB
JavaScript
161 lines
3.6 KiB
JavaScript
'use strict'
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var xtend = require('xtend')
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var encode = require('stringify-entities')
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var defaults = require('./defaults')
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var escapeFactory = require('./escape')
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var identity = require('./util/identity')
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module.exports = setOptions
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// Map of applicable enums.
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var maps = {
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entities: {true: true, false: true, numbers: true, escape: true},
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bullet: {'*': true, '-': true, '+': true},
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rule: {'-': true, _: true, '*': true},
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listItemIndent: {tab: true, mixed: true, 1: true},
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emphasis: {_: true, '*': true},
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strong: {_: true, '*': true},
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fence: {'`': true, '~': true}
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}
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// Expose `validate`.
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var validate = {
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boolean: validateBoolean,
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string: validateString,
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number: validateNumber,
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function: validateFunction
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}
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// Set options. Does not overwrite previously set options.
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function setOptions(options) {
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var self = this
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var current = self.options
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var ruleRepetition
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var key
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if (options == null) {
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options = {}
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} else if (typeof options === 'object') {
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options = xtend(options)
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} else {
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throw new Error('Invalid value `' + options + '` for setting `options`')
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}
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for (key in defaults) {
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validate[typeof defaults[key]](options, key, current[key], maps[key])
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}
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ruleRepetition = options.ruleRepetition
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if (ruleRepetition && ruleRepetition < 3) {
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raise(ruleRepetition, 'options.ruleRepetition')
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}
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self.encode = encodeFactory(String(options.entities))
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self.escape = escapeFactory(options)
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self.options = options
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return self
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}
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// Validate a value to be boolean. Defaults to `def`. Raises an exception with
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// `context[name]` when not a boolean.
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function validateBoolean(context, name, def) {
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var value = context[name]
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if (value == null) {
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value = def
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}
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if (typeof value !== 'boolean') {
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raise(value, 'options.' + name)
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}
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context[name] = value
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}
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// Validate a value to be boolean. Defaults to `def`. Raises an exception with
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// `context[name]` when not a boolean.
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function validateNumber(context, name, def) {
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var value = context[name]
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if (value == null) {
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value = def
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}
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if (isNaN(value)) {
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raise(value, 'options.' + name)
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}
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context[name] = value
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}
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// Validate a value to be in `map`. Defaults to `def`. Raises an exception
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// with `context[name]` when not in `map`.
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function validateString(context, name, def, map) {
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var value = context[name]
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if (value == null) {
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value = def
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}
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value = String(value)
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if (!(value in map)) {
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raise(value, 'options.' + name)
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}
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context[name] = value
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}
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// Validate a value to be function. Defaults to `def`. Raises an exception
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// with `context[name]` when not a function.
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function validateFunction(context, name, def) {
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var value = context[name]
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if (value == null) {
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value = def
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}
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if (typeof value !== 'function') {
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raise(value, 'options.' + name)
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}
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context[name] = value
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}
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// Factory to encode HTML entities. Creates a no-operation function when
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// `type` is `'false'`, a function which encodes using named references when
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// `type` is `'true'`, and a function which encodes using numbered references
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// when `type` is `'numbers'`.
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function encodeFactory(type) {
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var options = {}
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if (type === 'false') {
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return identity
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}
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if (type === 'true') {
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options.useNamedReferences = true
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}
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if (type === 'escape') {
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options.escapeOnly = true
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options.useNamedReferences = true
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}
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return wrapped
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// Encode HTML entities using the bound options.
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function wrapped(value) {
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return encode(value, options)
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}
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}
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// Throw an exception with in its `message` `value` and `name`.
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function raise(value, name) {
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throw new Error('Invalid value `' + value + '` for setting `' + name + '`')
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}
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