--- /dev/null
+import type {ScopeValueSets, NameValue, ValueScope, ValueScopeName} from "./scope"
+import {_, nil, _Code, Code, Name, UsedNames, CodeItem, addCodeArg, _CodeOrName} from "./code"
+import {Scope, varKinds} from "./scope"
+
+export {_, str, strConcat, nil, getProperty, stringify, Name, Code} from "./code"
+export {Scope, ScopeStore, ValueScope, ValueScopeName, ScopeValueSets, varKinds} from "./scope"
+
+// type for expressions that can be safely inserted in code without quotes
+export type SafeExpr = Code | number | boolean | null
+
+// type that is either Code of function that adds code to CodeGen instance using its methods
+export type Block = Code | (() => void)
+
+export const operators = {
+ GT: new _Code(">"),
+ GTE: new _Code(">="),
+ LT: new _Code("<"),
+ LTE: new _Code("<="),
+ EQ: new _Code("==="),
+ NEQ: new _Code("!=="),
+ NOT: new _Code("!"),
+ OR: new _Code("||"),
+ AND: new _Code("&&"),
+ ADD: new _Code("+"),
+}
+
+abstract class Node {
+ abstract readonly names: UsedNames
+
+ optimizeNodes(): this | ChildNode | ChildNode[] | undefined {
+ return this
+ }
+
+ optimizeNames(_names: UsedNames, _constants: Constants): this | undefined {
+ return this
+ }
+
+ // get count(): number {
+ // return 1
+ // }
+}
+
+class Def extends Node {
+ constructor(private readonly varKind: Name, private readonly name: Name, private rhs?: SafeExpr) {
+ super()
+ }
+
+ render({es5, _n}: CGOptions): string {
+ const varKind = es5 ? varKinds.var : this.varKind
+ const rhs = this.rhs === undefined ? "" : ` = ${this.rhs}`
+ return `${varKind} ${this.name}${rhs};` + _n
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this | undefined {
+ if (!names[this.name.str]) return
+ if (this.rhs) this.rhs = optimizeExpr(this.rhs, names, constants)
+ return this
+ }
+
+ get names(): UsedNames {
+ return this.rhs instanceof _CodeOrName ? this.rhs.names : {}
+ }
+}
+
+class Assign extends Node {
+ constructor(readonly lhs: Code, public rhs: SafeExpr, private readonly sideEffects?: boolean) {
+ super()
+ }
+
+ render({_n}: CGOptions): string {
+ return `${this.lhs} = ${this.rhs};` + _n
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this | undefined {
+ if (this.lhs instanceof Name && !names[this.lhs.str] && !this.sideEffects) return
+ this.rhs = optimizeExpr(this.rhs, names, constants)
+ return this
+ }
+
+ get names(): UsedNames {
+ const names = this.lhs instanceof Name ? {} : {...this.lhs.names}
+ return addExprNames(names, this.rhs)
+ }
+}
+
+class AssignOp extends Assign {
+ constructor(lhs: Code, private readonly op: Code, rhs: SafeExpr, sideEffects?: boolean) {
+ super(lhs, rhs, sideEffects)
+ }
+
+ render({_n}: CGOptions): string {
+ return `${this.lhs} ${this.op}= ${this.rhs};` + _n
+ }
+}
+
+class Label extends Node {
+ readonly names: UsedNames = {}
+ constructor(readonly label: Name) {
+ super()
+ }
+
+ render({_n}: CGOptions): string {
+ return `${this.label}:` + _n
+ }
+}
+
+class Break extends Node {
+ readonly names: UsedNames = {}
+ constructor(readonly label?: Code) {
+ super()
+ }
+
+ render({_n}: CGOptions): string {
+ const label = this.label ? ` ${this.label}` : ""
+ return `break${label};` + _n
+ }
+}
+
+class Throw extends Node {
+ constructor(readonly error: Code) {
+ super()
+ }
+
+ render({_n}: CGOptions): string {
+ return `throw ${this.error};` + _n
+ }
+
+ get names(): UsedNames {
+ return this.error.names
+ }
+}
+
+class AnyCode extends Node {
+ constructor(private code: SafeExpr) {
+ super()
+ }
+
+ render({_n}: CGOptions): string {
+ return `${this.code};` + _n
+ }
+
+ optimizeNodes(): this | undefined {
+ return `${this.code}` ? this : undefined
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this {
+ this.code = optimizeExpr(this.code, names, constants)
+ return this
+ }
+
+ get names(): UsedNames {
+ return this.code instanceof _CodeOrName ? this.code.names : {}
+ }
+}
+
+abstract class ParentNode extends Node {
+ constructor(readonly nodes: ChildNode[] = []) {
+ super()
+ }
+
+ render(opts: CGOptions): string {
+ return this.nodes.reduce((code, n) => code + n.render(opts), "")
+ }
+
+ optimizeNodes(): this | ChildNode | ChildNode[] | undefined {
+ const {nodes} = this
+ let i = nodes.length
+ while (i--) {
+ const n = nodes[i].optimizeNodes()
+ if (Array.isArray(n)) nodes.splice(i, 1, ...n)
+ else if (n) nodes[i] = n
+ else nodes.splice(i, 1)
+ }
+ return nodes.length > 0 ? this : undefined
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this | undefined {
+ const {nodes} = this
+ let i = nodes.length
+ while (i--) {
+ // iterating backwards improves 1-pass optimization
+ const n = nodes[i]
+ if (n.optimizeNames(names, constants)) continue
+ subtractNames(names, n.names)
+ nodes.splice(i, 1)
+ }
+ return nodes.length > 0 ? this : undefined
+ }
+
+ get names(): UsedNames {
+ return this.nodes.reduce((names: UsedNames, n) => addNames(names, n.names), {})
+ }
+
+ // get count(): number {
+ // return this.nodes.reduce((c, n) => c + n.count, 1)
+ // }
+}
+
+abstract class BlockNode extends ParentNode {
+ render(opts: CGOptions): string {
+ return "{" + opts._n + super.render(opts) + "}" + opts._n
+ }
+}
+
+class Root extends ParentNode {}
+
+class Else extends BlockNode {
+ static readonly kind = "else"
+}
+
+class If extends BlockNode {
+ static readonly kind = "if"
+ else?: If | Else
+ constructor(private condition: Code | boolean, nodes?: ChildNode[]) {
+ super(nodes)
+ }
+
+ render(opts: CGOptions): string {
+ let code = `if(${this.condition})` + super.render(opts)
+ if (this.else) code += "else " + this.else.render(opts)
+ return code
+ }
+
+ optimizeNodes(): If | ChildNode[] | undefined {
+ super.optimizeNodes()
+ const cond = this.condition
+ if (cond === true) return this.nodes // else is ignored here
+ let e = this.else
+ if (e) {
+ const ns = e.optimizeNodes()
+ e = this.else = Array.isArray(ns) ? new Else(ns) : (ns as Else | undefined)
+ }
+ if (e) {
+ if (cond === false) return e instanceof If ? e : e.nodes
+ if (this.nodes.length) return this
+ return new If(not(cond), e instanceof If ? [e] : e.nodes)
+ }
+ if (cond === false || !this.nodes.length) return undefined
+ return this
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this | undefined {
+ this.else = this.else?.optimizeNames(names, constants)
+ if (!(super.optimizeNames(names, constants) || this.else)) return
+ this.condition = optimizeExpr(this.condition, names, constants)
+ return this
+ }
+
+ get names(): UsedNames {
+ const names = super.names
+ addExprNames(names, this.condition)
+ if (this.else) addNames(names, this.else.names)
+ return names
+ }
+
+ // get count(): number {
+ // return super.count + (this.else?.count || 0)
+ // }
+}
+
+abstract class For extends BlockNode {
+ static readonly kind = "for"
+}
+
+class ForLoop extends For {
+ constructor(private iteration: Code) {
+ super()
+ }
+
+ render(opts: CGOptions): string {
+ return `for(${this.iteration})` + super.render(opts)
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this | undefined {
+ if (!super.optimizeNames(names, constants)) return
+ this.iteration = optimizeExpr(this.iteration, names, constants)
+ return this
+ }
+
+ get names(): UsedNames {
+ return addNames(super.names, this.iteration.names)
+ }
+}
+
+class ForRange extends For {
+ constructor(
+ private readonly varKind: Name,
+ private readonly name: Name,
+ private readonly from: SafeExpr,
+ private readonly to: SafeExpr
+ ) {
+ super()
+ }
+
+ render(opts: CGOptions): string {
+ const varKind = opts.es5 ? varKinds.var : this.varKind
+ const {name, from, to} = this
+ return `for(${varKind} ${name}=${from}; ${name}<${to}; ${name}++)` + super.render(opts)
+ }
+
+ get names(): UsedNames {
+ const names = addExprNames(super.names, this.from)
+ return addExprNames(names, this.to)
+ }
+}
+
+class ForIter extends For {
+ constructor(
+ private readonly loop: "of" | "in",
+ private readonly varKind: Name,
+ private readonly name: Name,
+ private iterable: Code
+ ) {
+ super()
+ }
+
+ render(opts: CGOptions): string {
+ return `for(${this.varKind} ${this.name} ${this.loop} ${this.iterable})` + super.render(opts)
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this | undefined {
+ if (!super.optimizeNames(names, constants)) return
+ this.iterable = optimizeExpr(this.iterable, names, constants)
+ return this
+ }
+
+ get names(): UsedNames {
+ return addNames(super.names, this.iterable.names)
+ }
+}
+
+class Func extends BlockNode {
+ static readonly kind = "func"
+ constructor(public name: Name, public args: Code, public async?: boolean) {
+ super()
+ }
+
+ render(opts: CGOptions): string {
+ const _async = this.async ? "async " : ""
+ return `${_async}function ${this.name}(${this.args})` + super.render(opts)
+ }
+}
+
+class Return extends ParentNode {
+ static readonly kind = "return"
+
+ render(opts: CGOptions): string {
+ return "return " + super.render(opts)
+ }
+}
+
+class Try extends BlockNode {
+ catch?: Catch
+ finally?: Finally
+
+ render(opts: CGOptions): string {
+ let code = "try" + super.render(opts)
+ if (this.catch) code += this.catch.render(opts)
+ if (this.finally) code += this.finally.render(opts)
+ return code
+ }
+
+ optimizeNodes(): this {
+ super.optimizeNodes()
+ this.catch?.optimizeNodes() as Catch | undefined
+ this.finally?.optimizeNodes() as Finally | undefined
+ return this
+ }
+
+ optimizeNames(names: UsedNames, constants: Constants): this {
+ super.optimizeNames(names, constants)
+ this.catch?.optimizeNames(names, constants)
+ this.finally?.optimizeNames(names, constants)
+ return this
+ }
+
+ get names(): UsedNames {
+ const names = super.names
+ if (this.catch) addNames(names, this.catch.names)
+ if (this.finally) addNames(names, this.finally.names)
+ return names
+ }
+
+ // get count(): number {
+ // return super.count + (this.catch?.count || 0) + (this.finally?.count || 0)
+ // }
+}
+
+class Catch extends BlockNode {
+ static readonly kind = "catch"
+ constructor(readonly error: Name) {
+ super()
+ }
+
+ render(opts: CGOptions): string {
+ return `catch(${this.error})` + super.render(opts)
+ }
+}
+
+class Finally extends BlockNode {
+ static readonly kind = "finally"
+ render(opts: CGOptions): string {
+ return "finally" + super.render(opts)
+ }
+}
+
+type StartBlockNode = If | For | Func | Return | Try
+
+type LeafNode = Def | Assign | Label | Break | Throw | AnyCode
+
+type ChildNode = StartBlockNode | LeafNode
+
+type EndBlockNodeType =
+ | typeof If
+ | typeof Else
+ | typeof For
+ | typeof Func
+ | typeof Return
+ | typeof Catch
+ | typeof Finally
+
+type Constants = Record<string, SafeExpr | undefined>
+
+export interface CodeGenOptions {
+ es5?: boolean
+ lines?: boolean
+ ownProperties?: boolean
+}
+
+interface CGOptions extends CodeGenOptions {
+ _n: "\n" | ""
+}
+
+export class CodeGen {
+ readonly _scope: Scope
+ readonly _extScope: ValueScope
+ readonly _values: ScopeValueSets = {}
+ private readonly _nodes: ParentNode[]
+ private readonly _blockStarts: number[] = []
+ private readonly _constants: Constants = {}
+ private readonly opts: CGOptions
+
+ constructor(extScope: ValueScope, opts: CodeGenOptions = {}) {
+ this.opts = {...opts, _n: opts.lines ? "\n" : ""}
+ this._extScope = extScope
+ this._scope = new Scope({parent: extScope})
+ this._nodes = [new Root()]
+ }
+
+ toString(): string {
+ return this._root.render(this.opts)
+ }
+
+ // returns unique name in the internal scope
+ name(prefix: string): Name {
+ return this._scope.name(prefix)
+ }
+
+ // reserves unique name in the external scope
+ scopeName(prefix: string): ValueScopeName {
+ return this._extScope.name(prefix)
+ }
+
+ // reserves unique name in the external scope and assigns value to it
+ scopeValue(prefixOrName: ValueScopeName | string, value: NameValue): Name {
+ const name = this._extScope.value(prefixOrName, value)
+ const vs = this._values[name.prefix] || (this._values[name.prefix] = new Set())
+ vs.add(name)
+ return name
+ }
+
+ getScopeValue(prefix: string, keyOrRef: unknown): ValueScopeName | undefined {
+ return this._extScope.getValue(prefix, keyOrRef)
+ }
+
+ // return code that assigns values in the external scope to the names that are used internally
+ // (same names that were returned by gen.scopeName or gen.scopeValue)
+ scopeRefs(scopeName: Name): Code {
+ return this._extScope.scopeRefs(scopeName, this._values)
+ }
+
+ scopeCode(): Code {
+ return this._extScope.scopeCode(this._values)
+ }
+
+ private _def(
+ varKind: Name,
+ nameOrPrefix: Name | string,
+ rhs?: SafeExpr,
+ constant?: boolean
+ ): Name {
+ const name = this._scope.toName(nameOrPrefix)
+ if (rhs !== undefined && constant) this._constants[name.str] = rhs
+ this._leafNode(new Def(varKind, name, rhs))
+ return name
+ }
+
+ // `const` declaration (`var` in es5 mode)
+ const(nameOrPrefix: Name | string, rhs: SafeExpr, _constant?: boolean): Name {
+ return this._def(varKinds.const, nameOrPrefix, rhs, _constant)
+ }
+
+ // `let` declaration with optional assignment (`var` in es5 mode)
+ let(nameOrPrefix: Name | string, rhs?: SafeExpr, _constant?: boolean): Name {
+ return this._def(varKinds.let, nameOrPrefix, rhs, _constant)
+ }
+
+ // `var` declaration with optional assignment
+ var(nameOrPrefix: Name | string, rhs?: SafeExpr, _constant?: boolean): Name {
+ return this._def(varKinds.var, nameOrPrefix, rhs, _constant)
+ }
+
+ // assignment code
+ assign(lhs: Code, rhs: SafeExpr, sideEffects?: boolean): CodeGen {
+ return this._leafNode(new Assign(lhs, rhs, sideEffects))
+ }
+
+ // `+=` code
+ add(lhs: Code, rhs: SafeExpr): CodeGen {
+ return this._leafNode(new AssignOp(lhs, operators.ADD, rhs))
+ }
+
+ // appends passed SafeExpr to code or executes Block
+ code(c: Block | SafeExpr): CodeGen {
+ if (typeof c == "function") c()
+ else if (c !== nil) this._leafNode(new AnyCode(c))
+ return this
+ }
+
+ // returns code for object literal for the passed argument list of key-value pairs
+ object(...keyValues: [Name | string, SafeExpr | string][]): _Code {
+ const code: CodeItem[] = ["{"]
+ for (const [key, value] of keyValues) {
+ if (code.length > 1) code.push(",")
+ code.push(key)
+ if (key !== value || this.opts.es5) {
+ code.push(":")
+ addCodeArg(code, value)
+ }
+ }
+ code.push("}")
+ return new _Code(code)
+ }
+
+ // `if` clause (or statement if `thenBody` and, optionally, `elseBody` are passed)
+ if(condition: Code | boolean, thenBody?: Block, elseBody?: Block): CodeGen {
+ this._blockNode(new If(condition))
+
+ if (thenBody && elseBody) {
+ this.code(thenBody).else().code(elseBody).endIf()
+ } else if (thenBody) {
+ this.code(thenBody).endIf()
+ } else if (elseBody) {
+ throw new Error('CodeGen: "else" body without "then" body')
+ }
+ return this
+ }
+
+ // `else if` clause - invalid without `if` or after `else` clauses
+ elseIf(condition: Code | boolean): CodeGen {
+ return this._elseNode(new If(condition))
+ }
+
+ // `else` clause - only valid after `if` or `else if` clauses
+ else(): CodeGen {
+ return this._elseNode(new Else())
+ }
+
+ // end `if` statement (needed if gen.if was used only with condition)
+ endIf(): CodeGen {
+ return this._endBlockNode(If, Else)
+ }
+
+ private _for(node: For, forBody?: Block): CodeGen {
+ this._blockNode(node)
+ if (forBody) this.code(forBody).endFor()
+ return this
+ }
+
+ // a generic `for` clause (or statement if `forBody` is passed)
+ for(iteration: Code, forBody?: Block): CodeGen {
+ return this._for(new ForLoop(iteration), forBody)
+ }
+
+ // `for` statement for a range of values
+ forRange(
+ nameOrPrefix: Name | string,
+ from: SafeExpr,
+ to: SafeExpr,
+ forBody: (index: Name) => void,
+ varKind: Code = this.opts.es5 ? varKinds.var : varKinds.let
+ ): CodeGen {
+ const name = this._scope.toName(nameOrPrefix)
+ return this._for(new ForRange(varKind, name, from, to), () => forBody(name))
+ }
+
+ // `for-of` statement (in es5 mode replace with a normal for loop)
+ forOf(
+ nameOrPrefix: Name | string,
+ iterable: Code,
+ forBody: (item: Name) => void,
+ varKind: Code = varKinds.const
+ ): CodeGen {
+ const name = this._scope.toName(nameOrPrefix)
+ if (this.opts.es5) {
+ const arr = iterable instanceof Name ? iterable : this.var("_arr", iterable)
+ return this.forRange("_i", 0, _`${arr}.length`, (i) => {
+ this.var(name, _`${arr}[${i}]`)
+ forBody(name)
+ })
+ }
+ return this._for(new ForIter("of", varKind, name, iterable), () => forBody(name))
+ }
+
+ // `for-in` statement.
+ // With option `ownProperties` replaced with a `for-of` loop for object keys
+ forIn(
+ nameOrPrefix: Name | string,
+ obj: Code,
+ forBody: (item: Name) => void,
+ varKind: Code = this.opts.es5 ? varKinds.var : varKinds.const
+ ): CodeGen {
+ if (this.opts.ownProperties) {
+ return this.forOf(nameOrPrefix, _`Object.keys(${obj})`, forBody)
+ }
+ const name = this._scope.toName(nameOrPrefix)
+ return this._for(new ForIter("in", varKind, name, obj), () => forBody(name))
+ }
+
+ // end `for` loop
+ endFor(): CodeGen {
+ return this._endBlockNode(For)
+ }
+
+ // `label` statement
+ label(label: Name): CodeGen {
+ return this._leafNode(new Label(label))
+ }
+
+ // `break` statement
+ break(label?: Code): CodeGen {
+ return this._leafNode(new Break(label))
+ }
+
+ // `return` statement
+ return(value: Block | SafeExpr): CodeGen {
+ const node = new Return()
+ this._blockNode(node)
+ this.code(value)
+ if (node.nodes.length !== 1) throw new Error('CodeGen: "return" should have one node')
+ return this._endBlockNode(Return)
+ }
+
+ // `try` statement
+ try(tryBody: Block, catchCode?: (e: Name) => void, finallyCode?: Block): CodeGen {
+ if (!catchCode && !finallyCode) throw new Error('CodeGen: "try" without "catch" and "finally"')
+ const node = new Try()
+ this._blockNode(node)
+ this.code(tryBody)
+ if (catchCode) {
+ const error = this.name("e")
+ this._currNode = node.catch = new Catch(error)
+ catchCode(error)
+ }
+ if (finallyCode) {
+ this._currNode = node.finally = new Finally()
+ this.code(finallyCode)
+ }
+ return this._endBlockNode(Catch, Finally)
+ }
+
+ // `throw` statement
+ throw(error: Code): CodeGen {
+ return this._leafNode(new Throw(error))
+ }
+
+ // start self-balancing block
+ block(body?: Block, nodeCount?: number): CodeGen {
+ this._blockStarts.push(this._nodes.length)
+ if (body) this.code(body).endBlock(nodeCount)
+ return this
+ }
+
+ // end the current self-balancing block
+ endBlock(nodeCount?: number): CodeGen {
+ const len = this._blockStarts.pop()
+ if (len === undefined) throw new Error("CodeGen: not in self-balancing block")
+ const toClose = this._nodes.length - len
+ if (toClose < 0 || (nodeCount !== undefined && toClose !== nodeCount)) {
+ throw new Error(`CodeGen: wrong number of nodes: ${toClose} vs ${nodeCount} expected`)
+ }
+ this._nodes.length = len
+ return this
+ }
+
+ // `function` heading (or definition if funcBody is passed)
+ func(name: Name, args: Code = nil, async?: boolean, funcBody?: Block): CodeGen {
+ this._blockNode(new Func(name, args, async))
+ if (funcBody) this.code(funcBody).endFunc()
+ return this
+ }
+
+ // end function definition
+ endFunc(): CodeGen {
+ return this._endBlockNode(Func)
+ }
+
+ optimize(n = 1): void {
+ while (n-- > 0) {
+ this._root.optimizeNodes()
+ this._root.optimizeNames(this._root.names, this._constants)
+ }
+ }
+
+ private _leafNode(node: LeafNode): CodeGen {
+ this._currNode.nodes.push(node)
+ return this
+ }
+
+ private _blockNode(node: StartBlockNode): void {
+ this._currNode.nodes.push(node)
+ this._nodes.push(node)
+ }
+
+ private _endBlockNode(N1: EndBlockNodeType, N2?: EndBlockNodeType): CodeGen {
+ const n = this._currNode
+ if (n instanceof N1 || (N2 && n instanceof N2)) {
+ this._nodes.pop()
+ return this
+ }
+ throw new Error(`CodeGen: not in block "${N2 ? `${N1.kind}/${N2.kind}` : N1.kind}"`)
+ }
+
+ private _elseNode(node: If | Else): CodeGen {
+ const n = this._currNode
+ if (!(n instanceof If)) {
+ throw new Error('CodeGen: "else" without "if"')
+ }
+ this._currNode = n.else = node
+ return this
+ }
+
+ private get _root(): Root {
+ return this._nodes[0] as Root
+ }
+
+ private get _currNode(): ParentNode {
+ const ns = this._nodes
+ return ns[ns.length - 1]
+ }
+
+ private set _currNode(node: ParentNode) {
+ const ns = this._nodes
+ ns[ns.length - 1] = node
+ }
+
+ // get nodeCount(): number {
+ // return this._root.count
+ // }
+}
+
+function addNames(names: UsedNames, from: UsedNames): UsedNames {
+ for (const n in from) names[n] = (names[n] || 0) + (from[n] || 0)
+ return names
+}
+
+function addExprNames(names: UsedNames, from: SafeExpr): UsedNames {
+ return from instanceof _CodeOrName ? addNames(names, from.names) : names
+}
+
+function optimizeExpr<T extends SafeExpr | Code>(expr: T, names: UsedNames, constants: Constants): T
+function optimizeExpr(expr: SafeExpr, names: UsedNames, constants: Constants): SafeExpr {
+ if (expr instanceof Name) return replaceName(expr)
+ if (!canOptimize(expr)) return expr
+ return new _Code(
+ expr._items.reduce((items: CodeItem[], c: SafeExpr | string) => {
+ if (c instanceof Name) c = replaceName(c)
+ if (c instanceof _Code) items.push(...c._items)
+ else items.push(c)
+ return items
+ }, [])
+ )
+
+ function replaceName(n: Name): SafeExpr {
+ const c = constants[n.str]
+ if (c === undefined || names[n.str] !== 1) return n
+ delete names[n.str]
+ return c
+ }
+
+ function canOptimize(e: SafeExpr): e is _Code {
+ return (
+ e instanceof _Code &&
+ e._items.some(
+ (c) => c instanceof Name && names[c.str] === 1 && constants[c.str] !== undefined
+ )
+ )
+ }
+}
+
+function subtractNames(names: UsedNames, from: UsedNames): void {
+ for (const n in from) names[n] = (names[n] || 0) - (from[n] || 0)
+}
+
+export function not<T extends Code | SafeExpr>(x: T): T
+export function not(x: Code | SafeExpr): Code | SafeExpr {
+ return typeof x == "boolean" || typeof x == "number" || x === null ? !x : _`!${par(x)}`
+}
+
+const andCode = mappend(operators.AND)
+
+// boolean AND (&&) expression with the passed arguments
+export function and(...args: Code[]): Code {
+ return args.reduce(andCode)
+}
+
+const orCode = mappend(operators.OR)
+
+// boolean OR (||) expression with the passed arguments
+export function or(...args: Code[]): Code {
+ return args.reduce(orCode)
+}
+
+type MAppend = (x: Code, y: Code) => Code
+
+function mappend(op: Code): MAppend {
+ return (x, y) => (x === nil ? y : y === nil ? x : _`${par(x)} ${op} ${par(y)}`)
+}
+
+function par(x: Code): Code {
+ return x instanceof Name ? x : _`(${x})`
+}
projects / dotfiles / .git / blobdiff