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import {_, nil, Code, Name} from "./code"
interface NameGroup {
prefix: string
index: number
}
export interface NameValue {
ref: ValueReference // this is the reference to any value that can be referred to from generated code via `globals` var in the closure
key?: unknown // any key to identify a global to avoid duplicates, if not passed ref is used
code?: Code // this is the code creating the value needed for standalone code wit_out closure - can be a primitive value, function or import (`require`)
}
export type ValueReference = unknown // possibly make CodeGen parameterized type on this type
class ValueError extends Error {
readonly value?: NameValue
constructor(name: ValueScopeName) {
super(`CodeGen: "code" for ${name} not defined`)
this.value = name.value
}
}
interface ScopeOptions {
prefixes?: Set<string>
parent?: Scope
}
interface ValueScopeOptions extends ScopeOptions {
scope: ScopeStore
es5?: boolean
lines?: boolean
}
export type ScopeStore = Record<string, ValueReference[] | undefined>
type ScopeValues = {
[Prefix in string]?: Map<unknown, ValueScopeName>
}
export type ScopeValueSets = {
[Prefix in string]?: Set<ValueScopeName>
}
export enum UsedValueState {
Started,
Completed,
}
export type UsedScopeValues = {
[Prefix in string]?: Map<ValueScopeName, UsedValueState | undefined>
}
export const varKinds = {
const: new Name("const"),
let: new Name("let"),
var: new Name("var"),
}
export class Scope {
protected readonly _names: {[Prefix in string]?: NameGroup} = {}
protected readonly _prefixes?: Set<string>
protected readonly _parent?: Scope
constructor({prefixes, parent}: ScopeOptions = {}) {
this._prefixes = prefixes
this._parent = parent
}
toName(nameOrPrefix: Name | string): Name {
return nameOrPrefix instanceof Name ? nameOrPrefix : this.name(nameOrPrefix)
}
name(prefix: string): Name {
return new Name(this._newName(prefix))
}
protected _newName(prefix: string): string {
const ng = this._names[prefix] || this._nameGroup(prefix)
return `${prefix}${ng.index++}`
}
private _nameGroup(prefix: string): NameGroup {
if (this._parent?._prefixes?.has(prefix) || (this._prefixes && !this._prefixes.has(prefix))) {
throw new Error(`CodeGen: prefix "${prefix}" is not allowed in this scope`)
}
return (this._names[prefix] = {prefix, index: 0})
}
}
interface ScopePath {
property: string
itemIndex: number
}
export class ValueScopeName extends Name {
readonly prefix: string
value?: NameValue
scopePath?: Code
constructor(prefix: string, nameStr: string) {
super(nameStr)
this.prefix = prefix
}
setValue(value: NameValue, {property, itemIndex}: ScopePath): void {
this.value = value
this.scopePath = _`.${new Name(property)}[${itemIndex}]`
}
}
interface VSOptions extends ValueScopeOptions {
_n: Code
}
const line = _`\n`
export class ValueScope extends Scope {
protected readonly _values: ScopeValues = {}
protected readonly _scope: ScopeStore
readonly opts: VSOptions
constructor(opts: ValueScopeOptions) {
super(opts)
this._scope = opts.scope
this.opts = {...opts, _n: opts.lines ? line : nil}
}
get(): ScopeStore {
return this._scope
}
name(prefix: string): ValueScopeName {
return new ValueScopeName(prefix, this._newName(prefix))
}
value(nameOrPrefix: ValueScopeName | string, value: NameValue): ValueScopeName {
if (value.ref === undefined) throw new Error("CodeGen: ref must be passed in value")
const name = this.toName(nameOrPrefix) as ValueScopeName
const {prefix} = name
const valueKey = value.key ?? value.ref
let vs = this._values[prefix]
if (vs) {
const _name = vs.get(valueKey)
if (_name) return _name
} else {
vs = this._values[prefix] = new Map()
}
vs.set(valueKey, name)
const s = this._scope[prefix] || (this._scope[prefix] = [])
const itemIndex = s.length
s[itemIndex] = value.ref
name.setValue(value, {property: prefix, itemIndex})
return name
}
getValue(prefix: string, keyOrRef: unknown): ValueScopeName | undefined {
const vs = this._values[prefix]
if (!vs) return
return vs.get(keyOrRef)
}
scopeRefs(scopeName: Name, values: ScopeValues | ScopeValueSets = this._values): Code {
return this._reduceValues(values, (name: ValueScopeName) => {
if (name.scopePath === undefined) throw new Error(`CodeGen: name "${name}" has no value`)
return _`${scopeName}${name.scopePath}`
})
}
scopeCode(
values: ScopeValues | ScopeValueSets = this._values,
usedValues?: UsedScopeValues,
getCode?: (n: ValueScopeName) => Code | undefined
): Code {
return this._reduceValues(
values,
(name: ValueScopeName) => {
if (name.value === undefined) throw new Error(`CodeGen: name "${name}" has no value`)
return name.value.code
},
usedValues,
getCode
)
}
private _reduceValues(
values: ScopeValues | ScopeValueSets,
valueCode: (n: ValueScopeName) => Code | undefined,
usedValues: UsedScopeValues = {},
getCode?: (n: ValueScopeName) => Code | undefined
): Code {
let code: Code = nil
for (const prefix in values) {
const vs = values[prefix]
if (!vs) continue
const nameSet = (usedValues[prefix] = usedValues[prefix] || new Map())
vs.forEach((name: ValueScopeName) => {
if (nameSet.has(name)) return
nameSet.set(name, UsedValueState.Started)
let c = valueCode(name)
if (c) {
const def = this.opts.es5 ? varKinds.var : varKinds.const
code = _`${code}${def} ${name} = ${c};${this.opts._n}`
} else if ((c = getCode?.(name))) {
code = _`${code}${c}${this.opts._n}`
} else {
throw new ValueError(name)
}
nameSet.set(name, UsedValueState.Completed)
})
}
return code
}
}
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