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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import * as o from './output/output_ast';
9const CONSTANT_PREFIX = '_c';
10/**
11 * `ConstantPool` tries to reuse literal factories when two or more literals are identical.
12 * We determine whether literals are identical by creating a key out of their AST using the
13 * `KeyVisitor`. This constant is used to replace dynamic expressions which can't be safely
14 * converted into a key. E.g. given an expression `{foo: bar()}`, since we don't know what
15 * the result of `bar` will be, we create a key that looks like `{foo: <unknown>}`. Note
16 * that we use a variable, rather than something like `null` in order to avoid collisions.
17 */
18const UNKNOWN_VALUE_KEY = o.variable('<unknown>');
19/**
20 * Context to use when producing a key.
21 *
22 * This ensures we see the constant not the reference variable when producing
23 * a key.
24 */
25const KEY_CONTEXT = {};
26/**
27 * Generally all primitive values are excluded from the `ConstantPool`, but there is an exclusion
28 * for strings that reach a certain length threshold. This constant defines the length threshold for
29 * strings.
30 */
31const POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS = 50;
32/**
33 * A node that is a place-holder that allows the node to be replaced when the actual
34 * node is known.
35 *
36 * This allows the constant pool to change an expression from a direct reference to
37 * a constant to a shared constant. It returns a fix-up node that is later allowed to
38 * change the referenced expression.
39 */
40class FixupExpression extends o.Expression {
41 constructor(resolved) {
42 super(resolved.type);
43 this.resolved = resolved;
44 this.original = resolved;
45 }
46 visitExpression(visitor, context) {
47 if (context === KEY_CONTEXT) {
48 // When producing a key we want to traverse the constant not the
49 // variable used to refer to it.
50 return this.original.visitExpression(visitor, context);
51 }
52 else {
53 return this.resolved.visitExpression(visitor, context);
54 }
55 }
56 isEquivalent(e) {
57 return e instanceof FixupExpression && this.resolved.isEquivalent(e.resolved);
58 }
59 isConstant() {
60 return true;
61 }
62 fixup(expression) {
63 this.resolved = expression;
64 this.shared = true;
65 }
66}
67/**
68 * A constant pool allows a code emitter to share constant in an output context.
69 *
70 * The constant pool also supports sharing access to ivy definitions references.
71 */
72export class ConstantPool {
73 constructor(isClosureCompilerEnabled = false) {
74 this.isClosureCompilerEnabled = isClosureCompilerEnabled;
75 this.statements = [];
76 this.literals = new Map();
77 this.literalFactories = new Map();
78 this.nextNameIndex = 0;
79 }
80 getConstLiteral(literal, forceShared) {
81 if ((literal instanceof o.LiteralExpr && !isLongStringLiteral(literal)) ||
82 literal instanceof FixupExpression) {
83 // Do no put simple literals into the constant pool or try to produce a constant for a
84 // reference to a constant.
85 return literal;
86 }
87 const key = this.keyOf(literal);
88 let fixup = this.literals.get(key);
89 let newValue = false;
90 if (!fixup) {
91 fixup = new FixupExpression(literal);
92 this.literals.set(key, fixup);
93 newValue = true;
94 }
95 if ((!newValue && !fixup.shared) || (newValue && forceShared)) {
96 // Replace the expression with a variable
97 const name = this.freshName();
98 let definition;
99 let usage;
100 if (this.isClosureCompilerEnabled && isLongStringLiteral(literal)) {
101 // For string literals, Closure will **always** inline the string at
102 // **all** usages, duplicating it each time. For large strings, this
103 // unnecessarily bloats bundle size. To work around this restriction, we
104 // wrap the string in a function, and call that function for each usage.
105 // This tricks Closure into using inline logic for functions instead of
106 // string literals. Function calls are only inlined if the body is small
107 // enough to be worth it. By doing this, very large strings will be
108 // shared across multiple usages, rather than duplicating the string at
109 // each usage site.
110 //
111 // const myStr = function() { return "very very very long string"; };
112 // const usage1 = myStr();
113 // const usage2 = myStr();
114 definition = o.variable(name).set(new o.FunctionExpr([], // Params.
115 [
116 // Statements.
117 new o.ReturnStatement(literal),
118 ]));
119 usage = o.variable(name).callFn([]);
120 }
121 else {
122 // Just declare and use the variable directly, without a function call
123 // indirection. This saves a few bytes and avoids an unncessary call.
124 definition = o.variable(name).set(literal);
125 usage = o.variable(name);
126 }
127 this.statements.push(definition.toDeclStmt(o.INFERRED_TYPE, o.StmtModifier.Final));
128 fixup.fixup(usage);
129 }
130 return fixup;
131 }
132 getLiteralFactory(literal) {
133 // Create a pure function that builds an array of a mix of constant and variable expressions
134 if (literal instanceof o.LiteralArrayExpr) {
135 const argumentsForKey = literal.entries.map(e => e.isConstant() ? e : UNKNOWN_VALUE_KEY);
136 const key = this.keyOf(o.literalArr(argumentsForKey));
137 return this._getLiteralFactory(key, literal.entries, entries => o.literalArr(entries));
138 }
139 else {
140 const expressionForKey = o.literalMap(literal.entries.map(e => ({
141 key: e.key,
142 value: e.value.isConstant() ? e.value : UNKNOWN_VALUE_KEY,
143 quoted: e.quoted
144 })));
145 const key = this.keyOf(expressionForKey);
146 return this._getLiteralFactory(key, literal.entries.map(e => e.value), entries => o.literalMap(entries.map((value, index) => ({
147 key: literal.entries[index].key,
148 value,
149 quoted: literal.entries[index].quoted
150 }))));
151 }
152 }
153 _getLiteralFactory(key, values, resultMap) {
154 let literalFactory = this.literalFactories.get(key);
155 const literalFactoryArguments = values.filter((e => !e.isConstant()));
156 if (!literalFactory) {
157 const resultExpressions = values.map((e, index) => e.isConstant() ? this.getConstLiteral(e, true) : o.variable(`a${index}`));
158 const parameters = resultExpressions.filter(isVariable).map(e => new o.FnParam(e.name, o.DYNAMIC_TYPE));
159 const pureFunctionDeclaration = o.fn(parameters, [new o.ReturnStatement(resultMap(resultExpressions))], o.INFERRED_TYPE);
160 const name = this.freshName();
161 this.statements.push(o.variable(name)
162 .set(pureFunctionDeclaration)
163 .toDeclStmt(o.INFERRED_TYPE, o.StmtModifier.Final));
164 literalFactory = o.variable(name);
165 this.literalFactories.set(key, literalFactory);
166 }
167 return { literalFactory, literalFactoryArguments };
168 }
169 /**
170 * Produce a unique name.
171 *
172 * The name might be unique among different prefixes if any of the prefixes end in
173 * a digit so the prefix should be a constant string (not based on user input) and
174 * must not end in a digit.
175 */
176 uniqueName(prefix) {
177 return `${prefix}${this.nextNameIndex++}`;
178 }
179 freshName() {
180 return this.uniqueName(CONSTANT_PREFIX);
181 }
182 keyOf(expression) {
183 return expression.visitExpression(new KeyVisitor(), KEY_CONTEXT);
184 }
185}
186/**
187 * Visitor used to determine if 2 expressions are equivalent and can be shared in the
188 * `ConstantPool`.
189 *
190 * When the id (string) generated by the visitor is equal, expressions are considered equivalent.
191 */
192class KeyVisitor {
193 constructor() {
194 this.visitWrappedNodeExpr = invalid;
195 this.visitWriteVarExpr = invalid;
196 this.visitWriteKeyExpr = invalid;
197 this.visitWritePropExpr = invalid;
198 this.visitInvokeFunctionExpr = invalid;
199 this.visitTaggedTemplateExpr = invalid;
200 this.visitInstantiateExpr = invalid;
201 this.visitConditionalExpr = invalid;
202 this.visitNotExpr = invalid;
203 this.visitAssertNotNullExpr = invalid;
204 this.visitCastExpr = invalid;
205 this.visitFunctionExpr = invalid;
206 this.visitUnaryOperatorExpr = invalid;
207 this.visitBinaryOperatorExpr = invalid;
208 this.visitReadPropExpr = invalid;
209 this.visitReadKeyExpr = invalid;
210 this.visitCommaExpr = invalid;
211 this.visitLocalizedString = invalid;
212 }
213 visitLiteralExpr(ast) {
214 return `${typeof ast.value === 'string' ? '"' + ast.value + '"' : ast.value}`;
215 }
216 visitLiteralArrayExpr(ast, context) {
217 return `[${ast.entries.map(entry => entry.visitExpression(this, context)).join(',')}]`;
218 }
219 visitLiteralMapExpr(ast, context) {
220 const mapKey = (entry) => {
221 const quote = entry.quoted ? '"' : '';
222 return `${quote}${entry.key}${quote}`;
223 };
224 const mapEntry = (entry) => `${mapKey(entry)}:${entry.value.visitExpression(this, context)}`;
225 return `{${ast.entries.map(mapEntry).join(',')}`;
226 }
227 visitExternalExpr(ast) {
228 return ast.value.moduleName ? `EX:${ast.value.moduleName}:${ast.value.name}` :
229 `EX:${ast.value.runtime.name}`;
230 }
231 visitReadVarExpr(node) {
232 return `VAR:${node.name}`;
233 }
234 visitTypeofExpr(node, context) {
235 return `TYPEOF:${node.expr.visitExpression(this, context)}`;
236 }
237}
238function invalid(arg) {
239 throw new Error(`Invalid state: Visitor ${this.constructor.name} doesn't handle ${arg.constructor.name}`);
240}
241function isVariable(e) {
242 return e instanceof o.ReadVarExpr;
243}
244function isLongStringLiteral(expr) {
245 return expr instanceof o.LiteralExpr && typeof expr.value === 'string' &&
246 expr.value.length >= POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS;
247}
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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\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\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  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(o.variable(name)\n                               .set(pureFunctionDeclaration)\n                               .toDeclStmt(o.INFERRED_TYPE, o.StmtModifier.Final));\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 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\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"]}
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