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protected _args: string[] | undefined
protected options: HookCompileOptions | undefined
// @ts-ignore
content(options: CodeFactoryContent) {
throw new Error('CodeFactory must be abstract')
}
create(options: HookCompileOptions) {
this.init(options)
let fn
Iif (!this.options || !this._args) {
return
}
switch (this.options.type) {
case 'sync':
fn = new Function(
this.args({}),
'"use strict";\n' +
this.header() +
this.content({
onError: (err) => `throw ${err};\n`,
onResult: (result) => `return ${result};\n`,
resultReturns: true,
onDone: () => '',
rethrowIfPossible: true
})
)
break
case 'async':
fn = new Function(
this.args({
after: '_callback'
}),
'"use strict";\n' +
this.header() +
this.content({
onError: (err) => `_callback(${err});\n`,
onResult: (result: any) => `_callback(null, ${result});\n`,
onDone: () => '_callback();\n'
})
)
break
case 'promise':
let errorHelperUsed = false
const content = this.content({
onError: (err) => {
errorHelperUsed = true
return `_error(${err});\n`
},
onResult: (result: any) => `_resolve(${result});\n`,
onDone: () => '_resolve();\n'
})
let code = ''
code += '"use strict";\n'
code += this.header()
code += 'return new Promise((function(_resolve, _reject) {\n'
Eif (errorHelperUsed) {
code += 'var _sync = true;\n'
code += 'function _error(_err) {\n'
code += 'if(_sync)\n'
code += '_resolve(Promise.resolve().then((function() { throw _err; })));\n'
code += 'else\n'
code += '_reject(_err);\n'
code += '};\n'
}
code += content
Eif (errorHelperUsed) {
code += '_sync = false;\n'
}
code += '}));\n'
fn = new Function(this.args({}), code)
break
}
this.deinit()
return fn
}
setup(fns: any[], options: HookCompileOptions) {
options.taps.forEach((item) => {
fns.push(item.fn)
})
}
/**
* @param {{ type: "sync" | "promise" | "async", taps: Array<Tap>, interceptors: Array<Interceptor> }} options
*/
init(options: HookCompileOptions) {
this.options = options
this._args = options.args.slice()
}
deinit() {
this.options = undefined
this._args = undefined
}
header() {
let code = ''
if (this.needContext()) {
code += 'var _context = {};\n'
} else {
code += 'var _context;\n'
}
code += 'var fns = this.fns;\n'
return code
}
needContext() {
Eif (this.options) {
for (const tap of this.options.taps) {
if (tap.context) {
return true
}
}
}
return false
}
callTap(
tapIndex: number,
{
onError,
onResult,
onDone,
rethrowIfPossible
}: Omit<CodeFactoryContent, 'onDone'> & { onDone: false | (() => any) }
) {
let code = ''
Iif (!this.options) {
return code
}
code += `var _fn${tapIndex} = ${this.getTapFn(tapIndex)};\n`
const tap = this.options.taps[tapIndex]
switch (tap.type) {
case 'sync':
Iif (!rethrowIfPossible) {
code += `var _hasError${tapIndex} = false;\n`
code += 'try {\n'
}
if (onResult) {
code += `var _result${tapIndex} = _fn${tapIndex}(${this.args({
before: tap.context ? '_context' : undefined
})});\n`
} else {
code += `_fn${tapIndex}(${this.args({
before: tap.context ? '_context' : undefined
})});\n`
}
Iif (!rethrowIfPossible) {
code += '} catch(_err) {\n'
code += `_hasError${tapIndex} = true;\n`
code += onError('_err')
code += '}\n'
code += `if(!_hasError${tapIndex}) {\n`
}
if (onResult) {
code += onResult(`_result${tapIndex}`)
}
if (onDone) {
code += onDone()
}
Iif (!rethrowIfPossible) {
code += '}\n'
}
break
case 'async':
let cbCode = ''
if (onResult) {
cbCode += `(function(_err${tapIndex}, _result${tapIndex}) {\n`
} else {
cbCode += `(function(_err${tapIndex}) {\n`
}
cbCode += `if(_err${tapIndex}) {\n`
cbCode += onError(`_err${tapIndex}`)
cbCode += '} else {\n'
if (onResult) {
cbCode += onResult(`_result${tapIndex}`)
}
if (onDone) {
cbCode += onDone()
}
cbCode += '}\n'
cbCode += '})'
code += `_fn${tapIndex}(${this.args({
before: tap.context ? '_context' : undefined,
after: cbCode
})});\n`
break
case 'promise':
code += `var _hasResult${tapIndex} = false;\n`
code += `var _promise${tapIndex} = _fn${tapIndex}(${this.args({
before: tap.context ? '_context' : undefined
})});\n`
code += `if (!_promise${tapIndex} || !_promise${tapIndex}.then)\n`
code += ` throw new Error('Tap function (tapPromise) did not return promise (returned ' + _promise${tapIndex} + ')');\n`
code += `_promise${tapIndex}.then((function(_result${tapIndex}) {\n`
code += `_hasResult${tapIndex} = true;\n`
if (onResult) {
code += onResult(`_result${tapIndex}`)
}
if (onDone) {
code += onDone()
}
code += `}), function(_err${tapIndex}) {\n`
code += `if(_hasResult${tapIndex}) throw _err${tapIndex};\n`
code += onError(`_err${tapIndex}`)
code += '});\n'
break
}
return code
}
callTapsSeries({
onError,
onResult,
resultReturns,
onDone,
doneReturns,
rethrowIfPossible
}: CodeFactoryContent) {
Iif (!this.options || this.options.taps.length === 0) {
return onDone()
}
const firstAsync = this.options.taps.findIndex((t) => t.type !== 'sync')
const somethingReturns = resultReturns || doneReturns
let code = ''
let current = onDone
let unrollCounter = 0
for (let j = this.options.taps.length - 1; j >= 0; j--) {
const i = j
const unroll =
current !== onDone && (this.options.taps[i].type !== 'sync' || unrollCounter++ > 20)
Iif (unroll) {
unrollCounter = 0
code += `function _next${i}() {\n`
code += current()
code += `}\n`
current = () => `${somethingReturns ? 'return ' : ''}_next${i}();\n`
}
const done = current
const doneBreak = (skipDone: boolean) => {
Eif (skipDone) {
return ''
}
return onDone()
}
const content = this.callTap(i, {
onError: (error: any) => onError(i, error, done, doneBreak),
onResult:
onResult &&
((result: any) => {
return onResult(i, result, done, doneBreak)
}),
onDone: !onResult && done,
rethrowIfPossible: rethrowIfPossible && (firstAsync < 0 || i < firstAsync)
})
current = () => content
}
code += current()
return code
}
callTapsLooping({ onError, onDone, rethrowIfPossible }: CodeFactoryContent) {
Iif (!this.options || this.options.taps.length === 0) {
return onDone()
}
const syncOnly = this.options.taps.every((t) => t.type === 'sync')
let code = ''
Iif (!syncOnly) {
code += 'var _looper = (function() {\n'
code += 'var _loopAsync = false;\n'
}
code += 'var _loop;\n'
code += 'do {\n'
code += '_loop = false;\n'
code += this.callTapsSeries({
onError,
onResult: (_i, result, next, doneBreak) => {
let _code = ''
_code += `if(${result} !== undefined) {\n`
_code += '_loop = true;\n'
Iif (!syncOnly) {
_code += 'if(_loopAsync) _looper();\n'
}
_code += doneBreak(true)
_code += `} else {\n`
_code += next()
_code += `}\n`
return _code
},
onDone:
onDone &&
(() => {
let _code = ''
_code += 'if(!_loop) {\n'
_code += onDone()
_code += '}\n'
return _code
}),
rethrowIfPossible: rethrowIfPossible && syncOnly
})
code += '} while(_loop);\n'
Iif (!syncOnly) {
code += '_loopAsync = true;\n'
code += '});\n'
code += '_looper();\n'
}
return code
}
callTapsParallel({
onError,
onResult,
onDone,
rethrowIfPossible,
onTap = (_i, run) => run()
}: CodeFactoryContent & {
// 每一个tap hook之间连接的作用
onTap?: (...args: any[]) => any
}) {
Iif (!this.options) {
return ''
}
Iif (this.options.taps.length <= 1) {
return this.callTapsSeries({
onError,
onResult,
onDone,
rethrowIfPossible
})
}
let code = ''
code += 'do {\n'
code += `var _counter = ${this.options.taps.length};\n`
Eif (onDone) {
code += 'var _done = (function() {\n'
code += onDone()
code += '});\n'
}
for (let i = 0; i < this.options.taps.length; i++) {
const done = () => {
// @ts-ignore
Eif (onDone) {
return 'if(--_counter === 0) _done();\n'
} else {
return '--_counter;'
}
}
const doneBreak = (skipDone: boolean) => {
Eif (skipDone || !onDone) {
return '_counter = 0;\n'
} else {
return '_counter = 0;\n_done();\n'
}
}
code += 'if(_counter <= 0) break;\n'
code += onTap(
i,
() =>
this.callTap(i, {
onError: (error) => {
let _code = ''
_code += 'if(_counter > 0) {\n'
_code += onError(i, error, done, doneBreak)
_code += '}\n'
return _code
},
onResult:
onResult &&
((result) => {
let _code = ''
_code += 'if(_counter > 0) {\n'
_code += onResult(i, result, done, doneBreak)
_code += '}\n'
return _code
}),
onDone:
!onResult &&
(() => {
return done()
}),
rethrowIfPossible
}),
done,
doneBreak
)
}
code += '} while(false);\n'
return code
}
args({ before, after }: { before?: string; after?: string }) {
let allArgs = this._args || []
if (before) {
allArgs = [before].concat(allArgs)
}
if (after) {
allArgs = allArgs.concat(after)
}
if (allArgs.length === 0) {
return ''
} else {
return allArgs.join(', ')
}
}
getTapFn(idx: number) {
return `fns[${idx}]`
}
getTap(idx: number) {
return `_taps[${idx}]`
}
}
export default CodeFactory
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