@angular/compiler
Version:
Angular - the compiler library
293 lines • 42.1 kB
JavaScript
/**
* @license
* Copyright Google LLC 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';
const CONSTANT_PREFIX = '_c';
/**
* `ConstantPool` tries to reuse literal factories when two or more literals are identical.
* We determine whether literals are identical by creating a key out of their AST using the
* `KeyVisitor`. This constant is used to replace dynamic expressions which can't be safely
* converted into a key. E.g. given an expression `{foo: bar()}`, since we don't know what
* the result of `bar` will be, we create a key that looks like `{foo: <unknown>}`. Note
* that we use a variable, rather than something like `null` in order to avoid collisions.
*/
const UNKNOWN_VALUE_KEY = o.variable('<unknown>');
/**
* Context to use when producing a key.
*
* This ensures we see the constant not the reference variable when producing
* a key.
*/
const KEY_CONTEXT = {};
/**
* Generally all primitive values are excluded from the `ConstantPool`, but there is an exclusion
* for strings that reach a certain length threshold. This constant defines the length threshold for
* strings.
*/
const POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS = 50;
/**
* 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(isClosureCompilerEnabled = false) {
this.isClosureCompilerEnabled = isClosureCompilerEnabled;
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 && !isLongStringLiteral(literal)) ||
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();
let definition;
let usage;
if (this.isClosureCompilerEnabled && isLongStringLiteral(literal)) {
// For string literals, Closure will **always** inline the string at
// **all** usages, duplicating it each time. For large strings, this
// unnecessarily bloats bundle size. To work around this restriction, we
// wrap the string in a function, and call that function for each usage.
// This tricks Closure into using inline logic for functions instead of
// string literals. Function calls are only inlined if the body is small
// enough to be worth it. By doing this, very large strings will be
// shared across multiple usages, rather than duplicating the string at
// each usage site.
//
// const myStr = function() { return "very very very long string"; };
// const usage1 = myStr();
// const usage2 = myStr();
definition = o.variable(name).set(new o.FunctionExpr([], // Params.
[
// Statements.
new o.ReturnStatement(literal),
]));
usage = o.variable(name).callFn([]);
}
else {
// Just declare and use the variable directly, without a function call
// indirection. This saves a few bytes and avoids an unncessary call.
definition = o.variable(name).set(literal);
usage = o.variable(name);
}
this.statements.push(definition.toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final]));
fixup.fixup(usage);
}
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 : UNKNOWN_VALUE_KEY);
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 : UNKNOWN_VALUE_KEY,
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}${this.nextNameIndex++}`;
}
definitionsOf(kind) {
switch (kind) {
case 2 /* Component */:
return this.componentDefinitions;
case 1 /* Directive */:
return this.directiveDefinitions;
case 0 /* Injector */:
return this.injectorDefinitions;
case 3 /* Pipe */:
return this.pipeDefinitions;
}
}
propertyNameOf(kind) {
switch (kind) {
case 2 /* Component */:
return 'ɵcmp';
case 1 /* Directive */:
return 'ɵdir';
case 0 /* Injector */:
return 'ɵinj';
case 3 /* Pipe */:
return 'ɵpipe';
}
}
freshName() {
return this.uniqueName(CONSTANT_PREFIX);
}
keyOf(expression) {
return expression.visitExpression(new KeyVisitor(), KEY_CONTEXT);
}
}
/**
* Visitor used to determine if 2 expressions are equivalent and can be shared in the
* `ConstantPool`.
*
* When the id (string) generated by the visitor is equal, expressions are considered equivalent.
*/
class KeyVisitor {
constructor() {
this.visitWrappedNodeExpr = invalid;
this.visitWriteVarExpr = invalid;
this.visitWriteKeyExpr = invalid;
this.visitWritePropExpr = invalid;
this.visitInvokeFunctionExpr = invalid;
this.visitTaggedTemplateExpr = invalid;
this.visitInstantiateExpr = invalid;
this.visitConditionalExpr = invalid;
this.visitNotExpr = invalid;
this.visitAssertNotNullExpr = invalid;
this.visitCastExpr = invalid;
this.visitFunctionExpr = invalid;
this.visitUnaryOperatorExpr = invalid;
this.visitBinaryOperatorExpr = invalid;
this.visitReadPropExpr = invalid;
this.visitReadKeyExpr = invalid;
this.visitCommaExpr = invalid;
this.visitLocalizedString = invalid;
}
visitLiteralExpr(ast) {
return `${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;
}
function isLongStringLiteral(expr) {
return expr instanceof o.LiteralExpr && typeof expr.value === 'string' &&
expr.value.length >= POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS;
}
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* @license\n * Copyright Google LLC 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';\n\nconst CONSTANT_PREFIX = '_c';\n\n/**\n * `ConstantPool` tries to reuse literal factories when two or more literals are identical.\n * We determine whether literals are identical by creating a key out of their AST using the\n * `KeyVisitor`. This constant is used to replace dynamic expressions which can't be safely\n * converted into a key. E.g. given an expression `{foo: bar()}`, since we don't know what\n * the result of `bar` will be, we create a key that looks like `{foo: <unknown>}`. Note\n * that we use a variable, rather than something like `null` in order to avoid collisions.\n */\nconst UNKNOWN_VALUE_KEY = o.variable('<unknown>');\n\nexport const enum DefinitionKind {\n  Injector,\n  Directive,\n  Component,\n  Pipe\n}\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 * Generally all primitive values are excluded from the `ConstantPool`, but there is an exclusion\n * for strings that reach a certain length threshold. This constant defines the length threshold for\n * strings.\n */\nconst POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS = 50;\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  override 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  override isEquivalent(e: o.Expression): boolean {\n    return e instanceof FixupExpression && this.resolved.isEquivalent(e.resolved);\n  }\n\n  override isConstant() {\n    return true;\n  }\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  constructor(private readonly isClosureCompilerEnabled: boolean = false) {}\n\n  getConstLiteral(literal: o.Expression, forceShared?: boolean): o.Expression {\n    if ((literal instanceof o.LiteralExpr && !isLongStringLiteral(literal)) ||\n        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      let definition: o.WriteVarExpr;\n      let usage: o.Expression;\n      if (this.isClosureCompilerEnabled && isLongStringLiteral(literal)) {\n        // For string literals, Closure will **always** inline the string at\n        // **all** usages, duplicating it each time. For large strings, this\n        // unnecessarily bloats bundle size. To work around this restriction, we\n        // wrap the string in a function, and call that function for each usage.\n        // This tricks Closure into using inline logic for functions instead of\n        // string literals. Function calls are only inlined if the body is small\n        // enough to be worth it. By doing this, very large strings will be\n        // shared across multiple usages, rather than duplicating the string at\n        // each usage site.\n        //\n        // const myStr = function() { return \"very very very long string\"; };\n        // const usage1 = myStr();\n        // const usage2 = myStr();\n        definition = o.variable(name).set(new o.FunctionExpr(\n            [],  // Params.\n            [\n              // Statements.\n              new o.ReturnStatement(literal),\n            ],\n            ));\n        usage = o.variable(name).callFn([]);\n      } else {\n        // Just declare and use the variable directly, without a function call\n        // indirection. This saves a few bytes and avoids an unncessary call.\n        definition = o.variable(name).set(literal);\n        usage = o.variable(name);\n      }\n\n      this.statements.push(definition.toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final]));\n      fixup.fixup(usage);\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 : UNKNOWN_VALUE_KEY);\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 : UNKNOWN_VALUE_KEY,\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 {\n    return `${prefix}${this.nextNameIndex++}`;\n  }\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  }\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  }\n\n  private freshName(): string {\n    return this.uniqueName(CONSTANT_PREFIX);\n  }\n\n  private keyOf(expression: o.Expression) {\n    return expression.visitExpression(new KeyVisitor(), KEY_CONTEXT);\n  }\n}\n\nexport interface OutputContext {\n  genFilePath: string;\n  statements: o.Statement[];\n  constantPool: ConstantPool;\n  importExpr(reference: any, typeParams?: o.Type[]|null, useSummaries?: boolean): o.Expression;\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:${ast.value.runtime.name}`;\n  }\n\n  visitReadVarExpr(node: o.ReadVarExpr) {\n    return `VAR:${node.name}`;\n  }\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  visitInvokeFunctionExpr = invalid;\n  visitTaggedTemplateExpr = invalid;\n  visitInstantiateExpr = invalid;\n  visitConditionalExpr = invalid;\n  visitNotExpr = invalid;\n  visitAssertNotNullExpr = invalid;\n  visitCastExpr = invalid;\n  visitFunctionExpr = invalid;\n  visitUnaryOperatorExpr = 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\nfunction isLongStringLiteral(expr: o.Expression): boolean {\n  return expr instanceof o.LiteralExpr && typeof expr.value === 'string' &&\n      expr.value.length >= POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS;\n}\n"]}