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14 KiB
{"version":3,"names":["_scopeflags","require","_parseError","Scope","constructor","flags","var","Set","lexical","functions","exports","ScopeHandler","parser","inModule","scopeStack","undefinedExports","Map","inTopLevel","currentScope","SCOPE_PROGRAM","inFunction","currentVarScopeFlags","SCOPE_FUNCTION","allowSuper","currentThisScopeFlags","SCOPE_SUPER","allowDirectSuper","SCOPE_DIRECT_SUPER","inClass","SCOPE_CLASS","inClassAndNotInNonArrowFunction","inStaticBlock","i","length","SCOPE_STATIC_BLOCK","SCOPE_VAR","inNonArrowFunction","treatFunctionsAsVar","treatFunctionsAsVarInScope","createScope","enter","push","exit","scope","pop","declareName","name","bindingType","loc","BIND_SCOPE_LEXICAL","BIND_SCOPE_FUNCTION","checkRedeclarationInScope","add","maybeExportDefined","BIND_SCOPE_VAR","delete","isRedeclaredInScope","raise","Errors","VarRedeclaration","at","identifierName","BIND_KIND_VALUE","has","SCOPE_SIMPLE_CATCH","values","next","value","checkLocalExport","id","topLevelScope","set","start","SCOPE_ARROW","default"],"sources":["../../src/util/scope.ts"],"sourcesContent":["import {\n SCOPE_ARROW,\n SCOPE_DIRECT_SUPER,\n SCOPE_FUNCTION,\n SCOPE_SIMPLE_CATCH,\n SCOPE_SUPER,\n SCOPE_PROGRAM,\n SCOPE_VAR,\n SCOPE_CLASS,\n SCOPE_STATIC_BLOCK,\n BIND_SCOPE_FUNCTION,\n BIND_SCOPE_VAR,\n BIND_SCOPE_LEXICAL,\n BIND_KIND_VALUE,\n type ScopeFlags,\n type BindingTypes,\n} from \"./scopeflags\";\nimport type { Position } from \"./location\";\nimport type * as N from \"../types\";\nimport { Errors } from \"../parse-error\";\nimport type Tokenizer from \"../tokenizer\";\n\n// Start an AST node, attaching a start offset.\nexport class Scope {\n declare flags: ScopeFlags;\n // A set of var-declared names in the current lexical scope\n var: Set<string> = new Set();\n // A set of lexically-declared names in the current lexical scope\n lexical: Set<string> = new Set();\n // A set of lexically-declared FunctionDeclaration names in the current lexical scope\n functions: Set<string> = new Set();\n\n constructor(flags: ScopeFlags) {\n this.flags = flags;\n }\n}\n\n// The functions in this module keep track of declared variables in the\n// current scope in order to detect duplicate variable names.\nexport default class ScopeHandler<IScope extends Scope = Scope> {\n parser: Tokenizer;\n scopeStack: Array<IScope> = [];\n inModule: boolean;\n undefinedExports: Map<string, Position> = new Map();\n\n constructor(parser: Tokenizer, inModule: boolean) {\n this.parser = parser;\n this.inModule = inModule;\n }\n\n get inTopLevel() {\n return (this.currentScope().flags & SCOPE_PROGRAM) > 0;\n }\n get inFunction() {\n return (this.currentVarScopeFlags() & SCOPE_FUNCTION) > 0;\n }\n get allowSuper() {\n return (this.currentThisScopeFlags() & SCOPE_SUPER) > 0;\n }\n get allowDirectSuper() {\n return (this.currentThisScopeFlags() & SCOPE_DIRECT_SUPER) > 0;\n }\n get inClass() {\n return (this.currentThisScopeFlags() & SCOPE_CLASS) > 0;\n }\n get inClassAndNotInNonArrowFunction() {\n const flags = this.currentThisScopeFlags();\n return (flags & SCOPE_CLASS) > 0 && (flags & SCOPE_FUNCTION) === 0;\n }\n get inStaticBlock() {\n for (let i = this.scopeStack.length - 1; ; i--) {\n const { flags } = this.scopeStack[i];\n if (flags & SCOPE_STATIC_BLOCK) {\n return true;\n }\n if (flags & (SCOPE_VAR | SCOPE_CLASS)) {\n // function body, module body, class property initializers\n return false;\n }\n }\n }\n get inNonArrowFunction() {\n return (this.currentThisScopeFlags() & SCOPE_FUNCTION) > 0;\n }\n get treatFunctionsAsVar() {\n return this.treatFunctionsAsVarInScope(this.currentScope());\n }\n\n createScope(flags: ScopeFlags): Scope {\n return new Scope(flags);\n }\n\n enter(flags: ScopeFlags) {\n /*:: +createScope: (flags: ScopeFlags) => IScope; */\n // @ts-expect-error This method will be overwritten by subclasses\n this.scopeStack.push(this.createScope(flags));\n }\n\n exit(): ScopeFlags {\n const scope = this.scopeStack.pop();\n return scope.flags;\n }\n\n // The spec says:\n // > At the top level of a function, or script, function declarations are\n // > treated like var declarations rather than like lexical declarations.\n treatFunctionsAsVarInScope(scope: IScope): boolean {\n return !!(\n scope.flags & (SCOPE_FUNCTION | SCOPE_STATIC_BLOCK) ||\n (!this.parser.inModule && scope.flags & SCOPE_PROGRAM)\n );\n }\n\n declareName(name: string, bindingType: BindingTypes, loc: Position) {\n let scope = this.currentScope();\n if (bindingType & BIND_SCOPE_LEXICAL || bindingType & BIND_SCOPE_FUNCTION) {\n this.checkRedeclarationInScope(scope, name, bindingType, loc);\n\n if (bindingType & BIND_SCOPE_FUNCTION) {\n scope.functions.add(name);\n } else {\n scope.lexical.add(name);\n }\n\n if (bindingType & BIND_SCOPE_LEXICAL) {\n this.maybeExportDefined(scope, name);\n }\n } else if (bindingType & BIND_SCOPE_VAR) {\n for (let i = this.scopeStack.length - 1; i >= 0; --i) {\n scope = this.scopeStack[i];\n this.checkRedeclarationInScope(scope, name, bindingType, loc);\n scope.var.add(name);\n this.maybeExportDefined(scope, name);\n\n if (scope.flags & SCOPE_VAR) break;\n }\n }\n if (this.parser.inModule && scope.flags & SCOPE_PROGRAM) {\n this.undefinedExports.delete(name);\n }\n }\n\n maybeExportDefined(scope: IScope, name: string) {\n if (this.parser.inModule && scope.flags & SCOPE_PROGRAM) {\n this.undefinedExports.delete(name);\n }\n }\n\n checkRedeclarationInScope(\n scope: IScope,\n name: string,\n bindingType: BindingTypes,\n loc: Position,\n ) {\n if (this.isRedeclaredInScope(scope, name, bindingType)) {\n this.parser.raise(Errors.VarRedeclaration, {\n at: loc,\n identifierName: name,\n });\n }\n }\n\n isRedeclaredInScope(\n scope: IScope,\n name: string,\n bindingType: BindingTypes,\n ): boolean {\n if (!(bindingType & BIND_KIND_VALUE)) return false;\n\n if (bindingType & BIND_SCOPE_LEXICAL) {\n return (\n scope.lexical.has(name) ||\n scope.functions.has(name) ||\n scope.var.has(name)\n );\n }\n\n if (bindingType & BIND_SCOPE_FUNCTION) {\n return (\n scope.lexical.has(name) ||\n (!this.treatFunctionsAsVarInScope(scope) && scope.var.has(name))\n );\n }\n\n return (\n (scope.lexical.has(name) &&\n // Annex B.3.4\n // https://tc39.es/ecma262/#sec-variablestatements-in-catch-blocks\n !(\n scope.flags & SCOPE_SIMPLE_CATCH &&\n scope.lexical.values().next().value === name\n )) ||\n (!this.treatFunctionsAsVarInScope(scope) && scope.functions.has(name))\n );\n }\n\n checkLocalExport(id: N.Identifier) {\n const { name } = id;\n const topLevelScope = this.scopeStack[0];\n if (\n !topLevelScope.lexical.has(name) &&\n !topLevelScope.var.has(name) &&\n // In strict mode, scope.functions will always be empty.\n // Modules are strict by default, but the `scriptMode` option\n // can overwrite this behavior.\n !topLevelScope.functions.has(name)\n ) {\n this.undefinedExports.set(name, id.loc.start);\n }\n }\n\n currentScope(): IScope {\n return this.scopeStack[this.scopeStack.length - 1];\n }\n\n currentVarScopeFlags(): ScopeFlags {\n for (let i = this.scopeStack.length - 1; ; i--) {\n const { flags } = this.scopeStack[i];\n if (flags & SCOPE_VAR) {\n return flags;\n }\n }\n }\n\n // Could be useful for `arguments`, `this`, `new.target`, `super()`, `super.property`, and `super[property]`.\n currentThisScopeFlags(): ScopeFlags {\n for (let i = this.scopeStack.length - 1; ; i--) {\n const { flags } = this.scopeStack[i];\n if (flags & (SCOPE_VAR | SCOPE_CLASS) && !(flags & SCOPE_ARROW)) {\n return flags;\n }\n }\n 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