97 lines
3.2 KiB
JavaScript
97 lines
3.2 KiB
JavaScript
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import { copyObj, createObj } from "./util/misc.js"
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// Known modes, by name and by MIME
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export let modes = {}, mimeModes = {}
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// Extra arguments are stored as the mode's dependencies, which is
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// used by (legacy) mechanisms like loadmode.js to automatically
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// load a mode. (Preferred mechanism is the require/define calls.)
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export function defineMode(name, mode) {
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if (arguments.length > 2)
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mode.dependencies = Array.prototype.slice.call(arguments, 2)
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modes[name] = mode
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}
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export function defineMIME(mime, spec) {
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mimeModes[mime] = spec
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}
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// Given a MIME type, a {name, ...options} config object, or a name
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// string, return a mode config object.
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export function resolveMode(spec) {
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if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
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spec = mimeModes[spec]
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} else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
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let found = mimeModes[spec.name]
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if (typeof found == "string") found = {name: found}
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spec = createObj(found, spec)
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spec.name = found.name
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} else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
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return resolveMode("application/xml")
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} else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
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return resolveMode("application/json")
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}
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if (typeof spec == "string") return {name: spec}
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else return spec || {name: "null"}
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}
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// Given a mode spec (anything that resolveMode accepts), find and
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// initialize an actual mode object.
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export function getMode(options, spec) {
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spec = resolveMode(spec)
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let mfactory = modes[spec.name]
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if (!mfactory) return getMode(options, "text/plain")
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let modeObj = mfactory(options, spec)
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if (modeExtensions.hasOwnProperty(spec.name)) {
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let exts = modeExtensions[spec.name]
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for (let prop in exts) {
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if (!exts.hasOwnProperty(prop)) continue
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if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop]
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modeObj[prop] = exts[prop]
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}
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}
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modeObj.name = spec.name
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if (spec.helperType) modeObj.helperType = spec.helperType
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if (spec.modeProps) for (let prop in spec.modeProps)
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modeObj[prop] = spec.modeProps[prop]
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return modeObj
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}
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// This can be used to attach properties to mode objects from
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// outside the actual mode definition.
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export let modeExtensions = {}
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export function extendMode(mode, properties) {
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let exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {})
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copyObj(properties, exts)
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}
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export function copyState(mode, state) {
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if (state === true) return state
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if (mode.copyState) return mode.copyState(state)
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let nstate = {}
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for (let n in state) {
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let val = state[n]
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if (val instanceof Array) val = val.concat([])
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nstate[n] = val
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}
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return nstate
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}
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// Given a mode and a state (for that mode), find the inner mode and
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// state at the position that the state refers to.
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export function innerMode(mode, state) {
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let info
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while (mode.innerMode) {
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info = mode.innerMode(state)
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if (!info || info.mode == mode) break
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state = info.state
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mode = info.mode
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}
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return info || {mode: mode, state: state}
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}
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export function startState(mode, a1, a2) {
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return mode.startState ? mode.startState(a1, a2) : true
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}
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