/** * @license * Copyright Google Inc. All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import * as o from './output/output_ast'; import { error } from './util'; const CONSTANT_PREFIX = '_c'; /** * Context to use when producing a key. * * This ensures we see the constant not the reference variable when producing * a key. */ const KEY_CONTEXT = {}; /** * A node that is a place-holder that allows the node to be replaced when the actual * node is known. * * This allows the constant pool to change an expression from a direct reference to * a constant to a shared constant. It returns a fix-up node that is later allowed to * change the referenced expression. */ class FixupExpression extends o.Expression { constructor(resolved) { super(resolved.type); this.resolved = resolved; this.original = resolved; } visitExpression(visitor, context) { if (context === KEY_CONTEXT) { // When producing a key we want to traverse the constant not the // variable used to refer to it. return this.original.visitExpression(visitor, context); } else { return this.resolved.visitExpression(visitor, context); } } isEquivalent(e) { return e instanceof FixupExpression && this.resolved.isEquivalent(e.resolved); } isConstant() { return true; } fixup(expression) { this.resolved = expression; this.shared = true; } } /** * A constant pool allows a code emitter to share constant in an output context. * * The constant pool also supports sharing access to ivy definitions references. */ export class ConstantPool { constructor() { this.statements = []; this.literals = new Map(); this.literalFactories = new Map(); this.injectorDefinitions = new Map(); this.directiveDefinitions = new Map(); this.componentDefinitions = new Map(); this.pipeDefinitions = new Map(); this.nextNameIndex = 0; } getConstLiteral(literal, forceShared) { if (literal instanceof o.LiteralExpr || literal instanceof FixupExpression) { // Do no put simple literals into the constant pool or try to produce a constant for a // reference to a constant. return literal; } const key = this.keyOf(literal); let fixup = this.literals.get(key); let newValue = false; if (!fixup) { fixup = new FixupExpression(literal); this.literals.set(key, fixup); newValue = true; } if ((!newValue && !fixup.shared) || (newValue && forceShared)) { // Replace the expression with a variable const name = this.freshName(); this.statements.push(o.variable(name).set(literal).toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final])); fixup.fixup(o.variable(name)); } return fixup; } getDefinition(type, kind, ctx, forceShared = false) { const definitions = this.definitionsOf(kind); let fixup = definitions.get(type); let newValue = false; if (!fixup) { const property = this.propertyNameOf(kind); fixup = new FixupExpression(ctx.importExpr(type).prop(property)); definitions.set(type, fixup); newValue = true; } if ((!newValue && !fixup.shared) || (newValue && forceShared)) { const name = this.freshName(); this.statements.push(o.variable(name).set(fixup.resolved).toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final])); fixup.fixup(o.variable(name)); } return fixup; } getLiteralFactory(literal) { // Create a pure function that builds an array of a mix of constant and variable expressions if (literal instanceof o.LiteralArrayExpr) { const argumentsForKey = literal.entries.map(e => e.isConstant() ? e : o.literal(null)); const key = this.keyOf(o.literalArr(argumentsForKey)); return this._getLiteralFactory(key, literal.entries, entries => o.literalArr(entries)); } else { const expressionForKey = o.literalMap(literal.entries.map(e => ({ key: e.key, value: e.value.isConstant() ? e.value : o.literal(null), quoted: e.quoted }))); const key = this.keyOf(expressionForKey); return this._getLiteralFactory(key, literal.entries.map(e => e.value), entries => o.literalMap(entries.map((value, index) => ({ key: literal.entries[index].key, value, quoted: literal.entries[index].quoted })))); } } _getLiteralFactory(key, values, resultMap) { let literalFactory = this.literalFactories.get(key); const literalFactoryArguments = values.filter((e => !e.isConstant())); if (!literalFactory) { const resultExpressions = values.map((e, index) => e.isConstant() ? this.getConstLiteral(e, true) : o.variable(`a${index}`)); const parameters = resultExpressions.filter(isVariable).map(e => new o.FnParam(e.name, o.DYNAMIC_TYPE)); const pureFunctionDeclaration = o.fn(parameters, [new o.ReturnStatement(resultMap(resultExpressions))], o.INFERRED_TYPE); const name = this.freshName(); this.statements.push(o.variable(name).set(pureFunctionDeclaration).toDeclStmt(o.INFERRED_TYPE, [ o.StmtModifier.Final ])); literalFactory = o.variable(name); this.literalFactories.set(key, literalFactory); } return { literalFactory, literalFactoryArguments }; } /** * Produce a unique name. * * The name might be unique among different prefixes if any of the prefixes end in * a digit so the prefix should be a constant string (not based on user input) and * must not end in a digit. */ uniqueName(prefix) { return `${prefix}${this.nextNameIndex++}`; } definitionsOf(kind) { switch (kind) { case 2 /* Component */: return this.componentDefinitions; case 1 /* Directive */: return this.directiveDefinitions; case 0 /* Injector */: return this.injectorDefinitions; case 3 /* Pipe */: return this.pipeDefinitions; } error(`Unknown definition kind ${kind}`); return this.componentDefinitions; } propertyNameOf(kind) { switch (kind) { case 2 /* Component */: return 'ɵcmp'; case 1 /* Directive */: return 'ɵdir'; case 0 /* Injector */: return 'ɵinj'; case 3 /* Pipe */: return 'ɵpipe'; } error(`Unknown definition kind ${kind}`); return '<unknown>'; } freshName() { return this.uniqueName(CONSTANT_PREFIX); } keyOf(expression) { return expression.visitExpression(new KeyVisitor(), KEY_CONTEXT); } } /** * Visitor used to determine if 2 expressions are equivalent and can be shared in the * `ConstantPool`. * * When the id (string) generated by the visitor is equal, expressions are considered equivalent. */ class KeyVisitor { constructor() { this.visitWrappedNodeExpr = invalid; this.visitWriteVarExpr = invalid; this.visitWriteKeyExpr = invalid; this.visitWritePropExpr = invalid; this.visitInvokeMethodExpr = invalid; this.visitInvokeFunctionExpr = invalid; this.visitInstantiateExpr = invalid; this.visitConditionalExpr = invalid; this.visitNotExpr = invalid; this.visitAssertNotNullExpr = invalid; this.visitCastExpr = invalid; this.visitFunctionExpr = invalid; this.visitBinaryOperatorExpr = invalid; this.visitReadPropExpr = invalid; this.visitReadKeyExpr = invalid; this.visitCommaExpr = invalid; this.visitLocalizedString = invalid; } visitLiteralExpr(ast) { return `${typeof ast.value === 'string' ? '"' + ast.value + '"' : ast.value}`; } visitLiteralArrayExpr(ast, context) { return `[${ast.entries.map(entry => entry.visitExpression(this, context)).join(',')}]`; } visitLiteralMapExpr(ast, context) { const mapKey = (entry) => { const quote = entry.quoted ? '"' : ''; return `${quote}${entry.key}${quote}`; }; const mapEntry = (entry) => `${mapKey(entry)}:${entry.value.visitExpression(this, context)}`; return `{${ast.entries.map(mapEntry).join(',')}`; } visitExternalExpr(ast) { return ast.value.moduleName ? `EX:${ast.value.moduleName}:${ast.value.name}` : `EX:${ast.value.runtime.name}`; } visitReadVarExpr(node) { return `VAR:${node.name}`; } visitTypeofExpr(node, context) { return `TYPEOF:${node.expr.visitExpression(this, context)}`; } } function invalid(arg) { throw new Error(`Invalid state: Visitor ${this.constructor.name} doesn't handle ${arg.constructor.name}`); } function isVariable(e) { return e instanceof o.ReadVarExpr; } //# 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* @license\n * Copyright Google Inc. All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport * as o from './output/output_ast';\nimport {OutputContext, error} from './util';\n\nconst CONSTANT_PREFIX = '_c';\n\nexport const enum DefinitionKind {Injector, Directive, Component, Pipe}\n\n/**\n * Context to use when producing a key.\n *\n * This ensures we see the constant not the reference variable when producing\n * a key.\n */\nconst KEY_CONTEXT = {};\n\n/**\n * A node that is a place-holder that allows the node to be replaced when the actual\n * node is known.\n *\n * This allows the constant pool to change an expression from a direct reference to\n * a constant to a shared constant. It returns a fix-up node that is later allowed to\n * change the referenced expression.\n */\nclass FixupExpression extends o.Expression {\n  private original: o.Expression;\n\n  // TODO(issue/24571): remove '!'.\n  shared !: boolean;\n\n  constructor(public resolved: o.Expression) {\n    super(resolved.type);\n    this.original = resolved;\n  }\n\n  visitExpression(visitor: o.ExpressionVisitor, context: any): any {\n    if (context === KEY_CONTEXT) {\n      // When producing a key we want to traverse the constant not the\n      // variable used to refer to it.\n      return this.original.visitExpression(visitor, context);\n    } else {\n      return this.resolved.visitExpression(visitor, context);\n    }\n  }\n\n  isEquivalent(e: o.Expression): boolean {\n    return e instanceof FixupExpression && this.resolved.isEquivalent(e.resolved);\n  }\n\n  isConstant() { return true; }\n\n  fixup(expression: o.Expression) {\n    this.resolved = expression;\n    this.shared = true;\n  }\n}\n\n/**\n * A constant pool allows a code emitter to share constant in an output context.\n *\n * The constant pool also supports sharing access to ivy definitions references.\n */\nexport class ConstantPool {\n  statements: o.Statement[] = [];\n  private literals = new Map<string, FixupExpression>();\n  private literalFactories = new Map<string, o.Expression>();\n  private injectorDefinitions = new Map<any, FixupExpression>();\n  private directiveDefinitions = new Map<any, FixupExpression>();\n  private componentDefinitions = new Map<any, FixupExpression>();\n  private pipeDefinitions = new Map<any, FixupExpression>();\n\n  private nextNameIndex = 0;\n\n  getConstLiteral(literal: o.Expression, forceShared?: boolean): o.Expression {\n    if (literal instanceof o.LiteralExpr || literal instanceof FixupExpression) {\n      // Do no put simple literals into the constant pool or try to produce a constant for a\n      // reference to a constant.\n      return literal;\n    }\n    const key = this.keyOf(literal);\n    let fixup = this.literals.get(key);\n    let newValue = false;\n    if (!fixup) {\n      fixup = new FixupExpression(literal);\n      this.literals.set(key, fixup);\n      newValue = true;\n    }\n\n    if ((!newValue && !fixup.shared) || (newValue && forceShared)) {\n      // Replace the expression with a variable\n      const name = this.freshName();\n      this.statements.push(\n          o.variable(name).set(literal).toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final]));\n      fixup.fixup(o.variable(name));\n    }\n\n    return fixup;\n  }\n\n  getDefinition(type: any, kind: DefinitionKind, ctx: OutputContext, forceShared: boolean = false):\n      o.Expression {\n    const definitions = this.definitionsOf(kind);\n    let fixup = definitions.get(type);\n    let newValue = false;\n    if (!fixup) {\n      const property = this.propertyNameOf(kind);\n      fixup = new FixupExpression(ctx.importExpr(type).prop(property));\n      definitions.set(type, fixup);\n      newValue = true;\n    }\n\n    if ((!newValue && !fixup.shared) || (newValue && forceShared)) {\n      const name = this.freshName();\n      this.statements.push(\n          o.variable(name).set(fixup.resolved).toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final]));\n      fixup.fixup(o.variable(name));\n    }\n    return fixup;\n  }\n\n  getLiteralFactory(literal: o.LiteralArrayExpr|o.LiteralMapExpr):\n      {literalFactory: o.Expression, literalFactoryArguments: o.Expression[]} {\n    // Create a pure function that builds an array of a mix of constant  and variable expressions\n    if (literal instanceof o.LiteralArrayExpr) {\n      const argumentsForKey = literal.entries.map(e => e.isConstant() ? e : o.literal(null));\n      const key = this.keyOf(o.literalArr(argumentsForKey));\n      return this._getLiteralFactory(key, literal.entries, entries => o.literalArr(entries));\n    } else {\n      const expressionForKey = o.literalMap(\n          literal.entries.map(e => ({\n                                key: e.key,\n                                value: e.value.isConstant() ? e.value : o.literal(null),\n                                quoted: e.quoted\n                              })));\n      const key = this.keyOf(expressionForKey);\n      return this._getLiteralFactory(\n          key, literal.entries.map(e => e.value),\n          entries => o.literalMap(entries.map((value, index) => ({\n                                                key: literal.entries[index].key,\n                                                value,\n                                                quoted: literal.entries[index].quoted\n                                              }))));\n    }\n  }\n\n  private _getLiteralFactory(\n      key: string, values: o.Expression[], resultMap: (parameters: o.Expression[]) => o.Expression):\n      {literalFactory: o.Expression, literalFactoryArguments: o.Expression[]} {\n    let literalFactory = this.literalFactories.get(key);\n    const literalFactoryArguments = values.filter((e => !e.isConstant()));\n    if (!literalFactory) {\n      const resultExpressions = values.map(\n          (e, index) => e.isConstant() ? this.getConstLiteral(e, true) : o.variable(`a${index}`));\n      const parameters =\n          resultExpressions.filter(isVariable).map(e => new o.FnParam(e.name !, o.DYNAMIC_TYPE));\n      const pureFunctionDeclaration =\n          o.fn(parameters, [new o.ReturnStatement(resultMap(resultExpressions))], o.INFERRED_TYPE);\n      const name = this.freshName();\n      this.statements.push(\n          o.variable(name).set(pureFunctionDeclaration).toDeclStmt(o.INFERRED_TYPE, [\n            o.StmtModifier.Final\n          ]));\n      literalFactory = o.variable(name);\n      this.literalFactories.set(key, literalFactory);\n    }\n    return {literalFactory, literalFactoryArguments};\n  }\n\n  /**\n   * Produce a unique name.\n   *\n   * The name might be unique among different prefixes if any of the prefixes end in\n   * a digit so the prefix should be a constant string (not based on user input) and\n   * must not end in a digit.\n   */\n  uniqueName(prefix: string): string { return `${prefix}${this.nextNameIndex++}`; }\n\n  private definitionsOf(kind: DefinitionKind): Map<any, FixupExpression> {\n    switch (kind) {\n      case DefinitionKind.Component:\n        return this.componentDefinitions;\n      case DefinitionKind.Directive:\n        return this.directiveDefinitions;\n      case DefinitionKind.Injector:\n        return this.injectorDefinitions;\n      case DefinitionKind.Pipe:\n        return this.pipeDefinitions;\n    }\n    error(`Unknown definition kind ${kind}`);\n    return this.componentDefinitions;\n  }\n\n  public propertyNameOf(kind: DefinitionKind): string {\n    switch (kind) {\n      case DefinitionKind.Component:\n        return 'ɵcmp';\n      case DefinitionKind.Directive:\n        return 'ɵdir';\n      case DefinitionKind.Injector:\n        return 'ɵinj';\n      case DefinitionKind.Pipe:\n        return 'ɵpipe';\n    }\n    error(`Unknown definition kind ${kind}`);\n    return '<unknown>';\n  }\n\n  private freshName(): string { return this.uniqueName(CONSTANT_PREFIX); }\n\n  private keyOf(expression: o.Expression) {\n    return expression.visitExpression(new KeyVisitor(), KEY_CONTEXT);\n  }\n}\n\n/**\n * Visitor used to determine if 2 expressions are equivalent and can be shared in the\n * `ConstantPool`.\n *\n * When the id (string) generated by the visitor is equal, expressions are considered equivalent.\n */\nclass KeyVisitor implements o.ExpressionVisitor {\n  visitLiteralExpr(ast: o.LiteralExpr): string {\n    return `${typeof ast.value === 'string' ? '\"' + ast.value + '\"' : ast.value}`;\n  }\n\n  visitLiteralArrayExpr(ast: o.LiteralArrayExpr, context: object): string {\n    return `[${ast.entries.map(entry => entry.visitExpression(this, context)).join(',')}]`;\n  }\n\n  visitLiteralMapExpr(ast: o.LiteralMapExpr, context: object): string {\n    const mapKey = (entry: o.LiteralMapEntry) => {\n      const quote = entry.quoted ? '\"' : '';\n      return `${quote}${entry.key}${quote}`;\n    };\n    const mapEntry = (entry: o.LiteralMapEntry) =>\n        `${mapKey(entry)}:${entry.value.visitExpression(this, context)}`;\n    return `{${ast.entries.map(mapEntry).join(',')}`;\n  }\n\n  visitExternalExpr(ast: o.ExternalExpr): string {\n    return ast.value.moduleName ? `EX:${ast.value.moduleName}:${ast.value.name}` :\n                                  `EX:${ast.value.runtime.name}`;\n  }\n\n  visitReadVarExpr(node: o.ReadVarExpr) { return `VAR:${node.name}`; }\n\n  visitTypeofExpr(node: o.TypeofExpr, context: any): string {\n    return `TYPEOF:${node.expr.visitExpression(this, context)}`;\n  }\n\n  visitWrappedNodeExpr = invalid;\n  visitWriteVarExpr = invalid;\n  visitWriteKeyExpr = invalid;\n  visitWritePropExpr = invalid;\n  visitInvokeMethodExpr = invalid;\n  visitInvokeFunctionExpr = invalid;\n  visitInstantiateExpr = invalid;\n  visitConditionalExpr = invalid;\n  visitNotExpr = invalid;\n  visitAssertNotNullExpr = invalid;\n  visitCastExpr = invalid;\n  visitFunctionExpr = invalid;\n  visitBinaryOperatorExpr = invalid;\n  visitReadPropExpr = invalid;\n  visitReadKeyExpr = invalid;\n  visitCommaExpr = invalid;\n  visitLocalizedString = invalid;\n}\n\nfunction invalid<T>(this: o.ExpressionVisitor, arg: o.Expression | o.Statement): never {\n  throw new Error(\n      `Invalid state: Visitor ${this.constructor.name} doesn't handle ${arg.constructor.name}`);\n}\n\nfunction isVariable(e: o.Expression): e is o.ReadVarExpr {\n  return e instanceof o.ReadVarExpr;\n}\n"]}