mirror of https://github.com/jkjoy/sunpeiwen.git
833 lines
22 KiB
TypeScript
833 lines
22 KiB
TypeScript
import type {ScopeValueSets, NameValue, ValueScope, ValueScopeName} from "./scope"
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import {_, nil, _Code, Code, Name, UsedNames, CodeItem, addCodeArg, _CodeOrName} from "./code"
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import {Scope, varKinds} from "./scope"
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export {_, str, strConcat, nil, getProperty, stringify, Name, Code} from "./code"
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export {Scope, ScopeStore, ValueScope, ValueScopeName, ScopeValueSets, varKinds} from "./scope"
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// type for expressions that can be safely inserted in code without quotes
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export type SafeExpr = Code | number | boolean | null
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// type that is either Code of function that adds code to CodeGen instance using its methods
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export type Block = Code | (() => void)
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export const operators = {
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GT: new _Code(">"),
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GTE: new _Code(">="),
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LT: new _Code("<"),
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LTE: new _Code("<="),
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EQ: new _Code("==="),
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NEQ: new _Code("!=="),
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NOT: new _Code("!"),
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OR: new _Code("||"),
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AND: new _Code("&&"),
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ADD: new _Code("+"),
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}
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abstract class Node {
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abstract readonly names: UsedNames
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optimizeNodes(): this | ChildNode | ChildNode[] | undefined {
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return this
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}
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optimizeNames(_names: UsedNames, _constants: Constants): this | undefined {
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return this
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}
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// get count(): number {
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// return 1
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// }
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}
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class Def extends Node {
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constructor(private readonly varKind: Name, private readonly name: Name, private rhs?: SafeExpr) {
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super()
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}
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render({es5, _n}: CGOptions): string {
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const varKind = es5 ? varKinds.var : this.varKind
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const rhs = this.rhs === undefined ? "" : ` = ${this.rhs}`
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return `${varKind} ${this.name}${rhs};` + _n
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}
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optimizeNames(names: UsedNames, constants: Constants): this | undefined {
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if (!names[this.name.str]) return
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if (this.rhs) this.rhs = optimizeExpr(this.rhs, names, constants)
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return this
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}
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get names(): UsedNames {
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return this.rhs instanceof _CodeOrName ? this.rhs.names : {}
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}
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}
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class Assign extends Node {
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constructor(readonly lhs: Code, public rhs: SafeExpr, private readonly sideEffects?: boolean) {
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super()
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}
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render({_n}: CGOptions): string {
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return `${this.lhs} = ${this.rhs};` + _n
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}
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optimizeNames(names: UsedNames, constants: Constants): this | undefined {
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if (this.lhs instanceof Name && !names[this.lhs.str] && !this.sideEffects) return
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this.rhs = optimizeExpr(this.rhs, names, constants)
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return this
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}
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get names(): UsedNames {
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const names = this.lhs instanceof Name ? {} : {...this.lhs.names}
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return addExprNames(names, this.rhs)
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}
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}
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class AssignOp extends Assign {
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constructor(lhs: Code, private readonly op: Code, rhs: SafeExpr, sideEffects?: boolean) {
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super(lhs, rhs, sideEffects)
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}
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render({_n}: CGOptions): string {
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return `${this.lhs} ${this.op}= ${this.rhs};` + _n
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}
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}
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class Label extends Node {
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readonly names: UsedNames = {}
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constructor(readonly label: Name) {
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super()
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}
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render({_n}: CGOptions): string {
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return `${this.label}:` + _n
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}
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}
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class Break extends Node {
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readonly names: UsedNames = {}
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constructor(readonly label?: Code) {
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super()
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}
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render({_n}: CGOptions): string {
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const label = this.label ? ` ${this.label}` : ""
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return `break${label};` + _n
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}
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}
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class Throw extends Node {
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constructor(readonly error: Code) {
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super()
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}
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render({_n}: CGOptions): string {
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return `throw ${this.error};` + _n
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}
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get names(): UsedNames {
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return this.error.names
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}
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}
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class AnyCode extends Node {
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constructor(private code: SafeExpr) {
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super()
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}
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render({_n}: CGOptions): string {
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return `${this.code};` + _n
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}
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optimizeNodes(): this | undefined {
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return `${this.code}` ? this : undefined
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}
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optimizeNames(names: UsedNames, constants: Constants): this {
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this.code = optimizeExpr(this.code, names, constants)
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return this
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}
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get names(): UsedNames {
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return this.code instanceof _CodeOrName ? this.code.names : {}
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}
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}
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abstract class ParentNode extends Node {
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constructor(readonly nodes: ChildNode[] = []) {
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super()
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}
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render(opts: CGOptions): string {
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return this.nodes.reduce((code, n) => code + n.render(opts), "")
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}
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optimizeNodes(): this | ChildNode | ChildNode[] | undefined {
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const {nodes} = this
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let i = nodes.length
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while (i--) {
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const n = nodes[i].optimizeNodes()
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if (Array.isArray(n)) nodes.splice(i, 1, ...n)
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else if (n) nodes[i] = n
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else nodes.splice(i, 1)
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}
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return nodes.length > 0 ? this : undefined
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}
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optimizeNames(names: UsedNames, constants: Constants): this | undefined {
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const {nodes} = this
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let i = nodes.length
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while (i--) {
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// iterating backwards improves 1-pass optimization
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const n = nodes[i]
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if (n.optimizeNames(names, constants)) continue
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subtractNames(names, n.names)
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nodes.splice(i, 1)
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}
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return nodes.length > 0 ? this : undefined
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}
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get names(): UsedNames {
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return this.nodes.reduce((names: UsedNames, n) => addNames(names, n.names), {})
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}
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// get count(): number {
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// return this.nodes.reduce((c, n) => c + n.count, 1)
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// }
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}
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abstract class BlockNode extends ParentNode {
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render(opts: CGOptions): string {
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return "{" + opts._n + super.render(opts) + "}" + opts._n
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}
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}
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class Root extends ParentNode {}
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class Else extends BlockNode {
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static readonly kind = "else"
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}
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class If extends BlockNode {
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static readonly kind = "if"
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else?: If | Else
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constructor(private condition: Code | boolean, nodes?: ChildNode[]) {
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super(nodes)
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}
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render(opts: CGOptions): string {
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let code = `if(${this.condition})` + super.render(opts)
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if (this.else) code += "else " + this.else.render(opts)
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return code
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}
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optimizeNodes(): If | ChildNode[] | undefined {
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super.optimizeNodes()
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const cond = this.condition
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if (cond === true) return this.nodes // else is ignored here
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let e = this.else
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if (e) {
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const ns = e.optimizeNodes()
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e = this.else = Array.isArray(ns) ? new Else(ns) : (ns as Else | undefined)
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}
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if (e) {
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if (cond === false) return e instanceof If ? e : e.nodes
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if (this.nodes.length) return this
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return new If(not(cond), e instanceof If ? [e] : e.nodes)
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}
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if (cond === false || !this.nodes.length) return undefined
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return this
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}
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optimizeNames(names: UsedNames, constants: Constants): this | undefined {
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this.else = this.else?.optimizeNames(names, constants)
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if (!(super.optimizeNames(names, constants) || this.else)) return
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this.condition = optimizeExpr(this.condition, names, constants)
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return this
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}
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get names(): UsedNames {
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const names = super.names
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addExprNames(names, this.condition)
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if (this.else) addNames(names, this.else.names)
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return names
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}
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// get count(): number {
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// return super.count + (this.else?.count || 0)
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// }
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}
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abstract class For extends BlockNode {
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static readonly kind = "for"
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}
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class ForLoop extends For {
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constructor(private iteration: Code) {
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super()
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}
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render(opts: CGOptions): string {
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return `for(${this.iteration})` + super.render(opts)
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}
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optimizeNames(names: UsedNames, constants: Constants): this | undefined {
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if (!super.optimizeNames(names, constants)) return
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this.iteration = optimizeExpr(this.iteration, names, constants)
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return this
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}
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get names(): UsedNames {
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return addNames(super.names, this.iteration.names)
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}
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}
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class ForRange extends For {
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constructor(
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private readonly varKind: Name,
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private readonly name: Name,
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private readonly from: SafeExpr,
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private readonly to: SafeExpr
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) {
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super()
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}
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render(opts: CGOptions): string {
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const varKind = opts.es5 ? varKinds.var : this.varKind
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const {name, from, to} = this
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return `for(${varKind} ${name}=${from}; ${name}<${to}; ${name}++)` + super.render(opts)
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}
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get names(): UsedNames {
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const names = addExprNames(super.names, this.from)
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return addExprNames(names, this.to)
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}
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}
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class ForIter extends For {
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constructor(
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private readonly loop: "of" | "in",
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private readonly varKind: Name,
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private readonly name: Name,
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private iterable: Code
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) {
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super()
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}
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render(opts: CGOptions): string {
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return `for(${this.varKind} ${this.name} ${this.loop} ${this.iterable})` + super.render(opts)
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}
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optimizeNames(names: UsedNames, constants: Constants): this | undefined {
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if (!super.optimizeNames(names, constants)) return
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this.iterable = optimizeExpr(this.iterable, names, constants)
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return this
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}
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get names(): UsedNames {
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return addNames(super.names, this.iterable.names)
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}
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}
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class Func extends BlockNode {
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static readonly kind = "func"
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constructor(public name: Name, public args: Code, public async?: boolean) {
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super()
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}
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render(opts: CGOptions): string {
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const _async = this.async ? "async " : ""
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return `${_async}function ${this.name}(${this.args})` + super.render(opts)
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}
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}
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class Return extends ParentNode {
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static readonly kind = "return"
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render(opts: CGOptions): string {
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return "return " + super.render(opts)
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}
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}
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class Try extends BlockNode {
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catch?: Catch
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finally?: Finally
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render(opts: CGOptions): string {
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let code = "try" + super.render(opts)
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if (this.catch) code += this.catch.render(opts)
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if (this.finally) code += this.finally.render(opts)
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return code
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}
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optimizeNodes(): this {
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super.optimizeNodes()
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this.catch?.optimizeNodes() as Catch | undefined
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this.finally?.optimizeNodes() as Finally | undefined
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return this
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}
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optimizeNames(names: UsedNames, constants: Constants): this {
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super.optimizeNames(names, constants)
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this.catch?.optimizeNames(names, constants)
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this.finally?.optimizeNames(names, constants)
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return this
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}
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get names(): UsedNames {
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const names = super.names
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if (this.catch) addNames(names, this.catch.names)
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if (this.finally) addNames(names, this.finally.names)
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return names
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}
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// get count(): number {
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// return super.count + (this.catch?.count || 0) + (this.finally?.count || 0)
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// }
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}
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class Catch extends BlockNode {
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static readonly kind = "catch"
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constructor(readonly error: Name) {
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super()
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}
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render(opts: CGOptions): string {
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return `catch(${this.error})` + super.render(opts)
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}
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}
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class Finally extends BlockNode {
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static readonly kind = "finally"
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render(opts: CGOptions): string {
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return "finally" + super.render(opts)
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}
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}
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type StartBlockNode = If | For | Func | Return | Try
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type LeafNode = Def | Assign | Label | Break | Throw | AnyCode
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type ChildNode = StartBlockNode | LeafNode
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type EndBlockNodeType =
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| typeof If
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| typeof Else
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| typeof For
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| typeof Func
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| typeof Return
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| typeof Catch
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| typeof Finally
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type Constants = Record<string, SafeExpr | undefined>
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export interface CodeGenOptions {
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es5?: boolean
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lines?: boolean
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ownProperties?: boolean
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}
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interface CGOptions extends CodeGenOptions {
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_n: "\n" | ""
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}
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export class CodeGen {
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readonly _scope: Scope
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readonly _extScope: ValueScope
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readonly _values: ScopeValueSets = {}
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private readonly _nodes: ParentNode[]
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private readonly _blockStarts: number[] = []
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private readonly _constants: Constants = {}
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private readonly opts: CGOptions
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constructor(extScope: ValueScope, opts: CodeGenOptions = {}) {
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this.opts = {...opts, _n: opts.lines ? "\n" : ""}
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this._extScope = extScope
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this._scope = new Scope({parent: extScope})
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this._nodes = [new Root()]
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}
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toString(): string {
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return this._root.render(this.opts)
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}
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// returns unique name in the internal scope
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name(prefix: string): Name {
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return this._scope.name(prefix)
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}
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// reserves unique name in the external scope
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scopeName(prefix: string): ValueScopeName {
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return this._extScope.name(prefix)
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}
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// reserves unique name in the external scope and assigns value to it
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scopeValue(prefixOrName: ValueScopeName | string, value: NameValue): Name {
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const name = this._extScope.value(prefixOrName, value)
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const vs = this._values[name.prefix] || (this._values[name.prefix] = new Set())
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vs.add(name)
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return name
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}
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getScopeValue(prefix: string, keyOrRef: unknown): ValueScopeName | undefined {
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return this._extScope.getValue(prefix, keyOrRef)
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}
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// return code that assigns values in the external scope to the names that are used internally
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// (same names that were returned by gen.scopeName or gen.scopeValue)
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scopeRefs(scopeName: Name): Code {
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return this._extScope.scopeRefs(scopeName, this._values)
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}
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scopeCode(): Code {
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return this._extScope.scopeCode(this._values)
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}
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private _def(
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varKind: Name,
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nameOrPrefix: Name | string,
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rhs?: SafeExpr,
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constant?: boolean
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): Name {
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const name = this._scope.toName(nameOrPrefix)
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if (rhs !== undefined && constant) this._constants[name.str] = rhs
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this._leafNode(new Def(varKind, name, rhs))
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return name
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}
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// `const` declaration (`var` in es5 mode)
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const(nameOrPrefix: Name | string, rhs: SafeExpr, _constant?: boolean): Name {
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return this._def(varKinds.const, nameOrPrefix, rhs, _constant)
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}
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// `let` declaration with optional assignment (`var` in es5 mode)
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let(nameOrPrefix: Name | string, rhs?: SafeExpr, _constant?: boolean): Name {
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return this._def(varKinds.let, nameOrPrefix, rhs, _constant)
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}
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// `var` declaration with optional assignment
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var(nameOrPrefix: Name | string, rhs?: SafeExpr, _constant?: boolean): Name {
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return this._def(varKinds.var, nameOrPrefix, rhs, _constant)
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}
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// assignment code
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assign(lhs: Code, rhs: SafeExpr, sideEffects?: boolean): CodeGen {
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return this._leafNode(new Assign(lhs, rhs, sideEffects))
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}
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// `+=` code
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add(lhs: Code, rhs: SafeExpr): CodeGen {
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return this._leafNode(new AssignOp(lhs, operators.ADD, rhs))
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}
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// appends passed SafeExpr to code or executes Block
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code(c: Block | SafeExpr): CodeGen {
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if (typeof c == "function") c()
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else if (c !== nil) this._leafNode(new AnyCode(c))
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return this
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}
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// returns code for object literal for the passed argument list of key-value pairs
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object(...keyValues: [Name | string, SafeExpr | string][]): _Code {
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const code: CodeItem[] = ["{"]
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for (const [key, value] of keyValues) {
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if (code.length > 1) code.push(",")
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code.push(key)
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if (key !== value || this.opts.es5) {
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code.push(":")
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addCodeArg(code, value)
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}
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}
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code.push("}")
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return new _Code(code)
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}
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// `if` clause (or statement if `thenBody` and, optionally, `elseBody` are passed)
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if(condition: Code | boolean, thenBody?: Block, elseBody?: Block): CodeGen {
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this._blockNode(new If(condition))
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if (thenBody && elseBody) {
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this.code(thenBody).else().code(elseBody).endIf()
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} else if (thenBody) {
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this.code(thenBody).endIf()
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} else if (elseBody) {
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throw new Error('CodeGen: "else" body without "then" body')
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}
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return this
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}
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// `else if` clause - invalid without `if` or after `else` clauses
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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})`
|
|
}
|