deno.land / x / nano_jsx@v0.1.0 / htm / build.ts
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const MODE_SLASH = 0const MODE_TEXT = 1const MODE_WHITESPACE = 2const MODE_TAGNAME = 3const MODE_COMMENT = 4const MODE_PROP_SET = 5const MODE_PROP_APPEND = 6
const CHILD_APPEND = 0const CHILD_RECURSE = 2const TAG_SET = 3const PROPS_ASSIGN = 4const PROP_SET = MODE_PROP_SETconst PROP_APPEND = MODE_PROP_APPEND
// Turn a result of a build(...) call into a tree that is more// convenient to analyze and transform (e.g. Babel plugins).// For example:// treeify(// build'<div href="1${a}" ...${b}><${x} /></div>`,// [X, Y, Z]// )// returns:// {// tag: 'div',// props: [ { href: ["1", X] }, Y ],// children: [ { tag: Z, props: [], children: [] } ]// }export const treeify = (built: any, fields: any) => { const _treeify = (built: any): any => { let tag = '' let currentProps: any = null const props = [] const children: any[] = []
for (let i = 1; i < built.length; i++) { const type = built[i++] const value = built[i] ? fields[built[i++] - 1] : built[++i]
if (type === TAG_SET) { tag = value } else if (type === PROPS_ASSIGN) { props.push(value) currentProps = null } else if (type === PROP_SET) { if (!currentProps) { currentProps = Object.create(null) props.push(currentProps) } currentProps[built[++i]] = [value] } else if (type === PROP_APPEND) { currentProps[built[++i]].push(value) } else if (type === CHILD_RECURSE) { children.push(_treeify(value)) } else if (type === CHILD_APPEND) { children.push(value) } }
return { tag, props, children } } const { children } = _treeify(built) return children.length > 1 ? children : children[0]}
export const evaluate = (h: any, built: any, fields: any, args: any): any => { let tmp
// `build()` used the first element of the operation list as // temporary workspace. Now that `build()` is done we can use // that space to track whether the current element is "dynamic" // (i.e. it or any of its descendants depend on dynamic values). built[0] = 0
for (let i = 1; i < built.length; i++) { const type = built[i++]
// Set `built[0]`'s appropriate bits if this element depends on a dynamic value. const value = built[i] ? ((built[0] |= type ? 1 : 2), fields[built[i++]]) : built[++i]
if (type === TAG_SET) { args[0] = value } else if (type === PROPS_ASSIGN) { args[1] = Object.assign(args[1] || {}, value) } else if (type === PROP_SET) { ;(args[1] = args[1] || {})[built[++i]] = value } else if (type === PROP_APPEND) { args[1][built[++i]] += `${value}` } else if (type) { // type === CHILD_RECURSE // Set the operation list (including the staticness bits) as // `this` for the `h` call. tmp = h.apply(value, evaluate(h, value, fields, ['', null])) args.push(tmp)
if (value[0]) { // Set the 2nd lowest bit it the child element is dynamic. built[0] |= 2 } else { // Rewrite the operation list in-place if the child element is static. // The currently evaluated piece `CHILD_RECURSE, 0, [...]` becomes // `CHILD_APPEND, 0, tmp`. // Essentially the operation list gets optimized for potential future // re-evaluations. built[i - 2] = CHILD_APPEND built[i] = tmp } } else { // type === CHILD_APPEND args.push(value) } }
return args}
export const build = function (statics: TemplateStringsArray, ...rest: any[]) { const fields = [statics, ...rest] // @ts-ignore const h = this
let mode: any = MODE_TEXT let buffer = '' let quote = '' let current: any = [0] let char: any let propName: any
const commit = (field?: any) => { if (mode === MODE_TEXT && (field || (buffer = buffer.replace(/^\s*\n\s*|\s*\n\s*$/g, '')))) { if (MINI) { current.push(field ? fields[field] : buffer) } else { current.push(CHILD_APPEND, field, buffer) } } else if (mode === MODE_TAGNAME && (field || buffer)) { if (MINI) { current[1] = field ? fields[field] : buffer } else { current.push(TAG_SET, field, buffer) } mode = MODE_WHITESPACE } else if (mode === MODE_WHITESPACE && buffer === '...' && field) { if (MINI) { current[2] = Object.assign(current[2] || {}, fields[field]) } else { current.push(PROPS_ASSIGN, field, 0) } } else if (mode === MODE_WHITESPACE && buffer && !field) { if (MINI) { ;(current[2] = current[2] || {})[buffer] = true } else { current.push(PROP_SET, 0, true, buffer) } } else if (mode >= MODE_PROP_SET) { if (MINI) { if (mode === MODE_PROP_SET) { ;(current[2] = current[2] || {})[propName] = field ? buffer ? buffer + fields[field] : fields[field] : buffer mode = MODE_PROP_APPEND } else if (field || buffer) { current[2][propName] += field ? buffer + fields[field] : buffer } } else { if (buffer || (!field && mode === MODE_PROP_SET)) { current.push(mode, 0, buffer, propName) mode = MODE_PROP_APPEND } if (field) { current.push(mode, field, 0, propName) mode = MODE_PROP_APPEND } } }
buffer = '' }
for (let i = 0; i < statics.length; i++) { if (i) { if (mode === MODE_TEXT) { commit() } commit(i) }
for (let j = 0; j < statics[i].length; j++) { char = statics[i][j]
if (mode === MODE_TEXT) { if (char === '<') { // commit buffer commit() if (MINI) { current = [current, '', null] } else { current = [current] } mode = MODE_TAGNAME } else { buffer += char } } else if (mode === MODE_COMMENT) { // Ignore everything until the last three characters are '-', '-' and '>' if (buffer === '--' && char === '>') { mode = MODE_TEXT buffer = '' } else { buffer = char + buffer[0] } } else if (quote) { if (char === quote) { quote = '' } else { buffer += char } } else if (char === '"' || char === "'") { quote = char } else if (char === '>') { commit() mode = MODE_TEXT } else if (!mode) { // Ignore everything until the tag ends } else if (char === '=') { mode = MODE_PROP_SET propName = buffer buffer = '' } else if (char === '/' && (mode < MODE_PROP_SET || statics[i][j + 1] === '>')) { commit() if (mode === MODE_TAGNAME) { current = current[0] } mode = current if (MINI) { ;(current = current[0]).push(h(...mode.slice(1))) } else { ;(current = current[0]).push(CHILD_RECURSE, 0, mode) } mode = MODE_SLASH } else if (char === ' ' || char === '\t' || char === '\n' || char === '\r') { // <a disabled> commit() mode = MODE_WHITESPACE } else { buffer += char }
if (mode === MODE_TAGNAME && buffer === '!--') { mode = MODE_COMMENT current = current[0] } } } commit()
if (MINI) { return current.length > 2 ? current.slice(1) : current[1] } return current}
nano_jsx
Version Info
8 months ago
