| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import * as o from './output/output_ast';
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| 9 | const CONSTANT_PREFIX = '_c';
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| 10 | /**
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| 11 | * `ConstantPool` tries to reuse literal factories when two or more literals are identical.
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| 12 | * We determine whether literals are identical by creating a key out of their AST using the
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| 13 | * `KeyVisitor`. This constant is used to replace dynamic expressions which can't be safely
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| 14 | * converted into a key. E.g. given an expression `{foo: bar()}`, since we don't know what
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| 15 | * the result of `bar` will be, we create a key that looks like `{foo: <unknown>}`. Note
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| 16 | * that we use a variable, rather than something like `null` in order to avoid collisions.
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| 17 | */
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| 18 | const UNKNOWN_VALUE_KEY = o.variable('<unknown>');
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| 19 | /**
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| 20 | * Context to use when producing a key.
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| 21 | *
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| 22 | * This ensures we see the constant not the reference variable when producing
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| 23 | * a key.
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| 24 | */
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| 25 | const KEY_CONTEXT = {};
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| 26 | /**
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| 27 | * Generally all primitive values are excluded from the `ConstantPool`, but there is an exclusion
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| 28 | * for strings that reach a certain length threshold. This constant defines the length threshold for
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| 29 | * strings.
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| 30 | */
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| 31 | const POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS = 50;
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| 32 | /**
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| 33 | * A node that is a place-holder that allows the node to be replaced when the actual
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| 34 | * node is known.
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| 35 | *
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| 36 | * This allows the constant pool to change an expression from a direct reference to
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| 37 | * a constant to a shared constant. It returns a fix-up node that is later allowed to
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| 38 | * change the referenced expression.
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| 39 | */
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| 40 | class FixupExpression extends o.Expression {
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| 41 | constructor(resolved) {
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| 42 | super(resolved.type);
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| 43 | this.resolved = resolved;
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| 44 | this.original = resolved;
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| 45 | }
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| 46 | visitExpression(visitor, context) {
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| 47 | if (context === KEY_CONTEXT) {
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| 48 | // When producing a key we want to traverse the constant not the
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| 49 | // variable used to refer to it.
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| 50 | return this.original.visitExpression(visitor, context);
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| 51 | }
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| 52 | else {
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| 53 | return this.resolved.visitExpression(visitor, context);
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| 54 | }
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| 55 | }
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| 56 | isEquivalent(e) {
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| 57 | return e instanceof FixupExpression && this.resolved.isEquivalent(e.resolved);
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| 58 | }
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| 59 | isConstant() {
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| 60 | return true;
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| 61 | }
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| 62 | fixup(expression) {
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| 63 | this.resolved = expression;
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| 64 | this.shared = true;
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| 65 | }
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| 66 | }
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| 67 | /**
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| 68 | * A constant pool allows a code emitter to share constant in an output context.
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| 69 | *
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| 70 | * The constant pool also supports sharing access to ivy definitions references.
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| 71 | */
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| 72 | export class ConstantPool {
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| 73 | constructor(isClosureCompilerEnabled = false) {
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| 74 | this.isClosureCompilerEnabled = isClosureCompilerEnabled;
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| 75 | this.statements = [];
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| 76 | this.literals = new Map();
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| 77 | this.literalFactories = new Map();
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| 78 | this.injectorDefinitions = new Map();
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| 79 | this.directiveDefinitions = new Map();
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| 80 | this.componentDefinitions = new Map();
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| 81 | this.pipeDefinitions = new Map();
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| 82 | this.nextNameIndex = 0;
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| 83 | }
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| 84 | getConstLiteral(literal, forceShared) {
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| 85 | if ((literal instanceof o.LiteralExpr && !isLongStringLiteral(literal)) ||
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| 86 | literal instanceof FixupExpression) {
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| 87 | // Do no put simple literals into the constant pool or try to produce a constant for a
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| 88 | // reference to a constant.
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| 89 | return literal;
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| 90 | }
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| 91 | const key = this.keyOf(literal);
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| 92 | let fixup = this.literals.get(key);
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| 93 | let newValue = false;
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| 94 | if (!fixup) {
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| 95 | fixup = new FixupExpression(literal);
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| 96 | this.literals.set(key, fixup);
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| 97 | newValue = true;
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| 98 | }
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| 99 | if ((!newValue && !fixup.shared) || (newValue && forceShared)) {
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| 100 | // Replace the expression with a variable
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| 101 | const name = this.freshName();
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| 102 | let definition;
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| 103 | let usage;
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| 104 | if (this.isClosureCompilerEnabled && isLongStringLiteral(literal)) {
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| 105 | // For string literals, Closure will **always** inline the string at
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| 106 | // **all** usages, duplicating it each time. For large strings, this
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| 107 | // unnecessarily bloats bundle size. To work around this restriction, we
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| 108 | // wrap the string in a function, and call that function for each usage.
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| 109 | // This tricks Closure into using inline logic for functions instead of
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| 110 | // string literals. Function calls are only inlined if the body is small
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| 111 | // enough to be worth it. By doing this, very large strings will be
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| 112 | // shared across multiple usages, rather than duplicating the string at
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| 113 | // each usage site.
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| 114 | //
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| 115 | // const myStr = function() { return "very very very long string"; };
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| 116 | // const usage1 = myStr();
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| 117 | // const usage2 = myStr();
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| 118 | definition = o.variable(name).set(new o.FunctionExpr([], // Params.
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| 119 | [
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| 120 | // Statements.
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| 121 | new o.ReturnStatement(literal),
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| 122 | ]));
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| 123 | usage = o.variable(name).callFn([]);
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| 124 | }
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| 125 | else {
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| 126 | // Just declare and use the variable directly, without a function call
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| 127 | // indirection. This saves a few bytes and avoids an unncessary call.
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| 128 | definition = o.variable(name).set(literal);
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| 129 | usage = o.variable(name);
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| 130 | }
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| 131 | this.statements.push(definition.toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final]));
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| 132 | fixup.fixup(usage);
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| 133 | }
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| 134 | return fixup;
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| 135 | }
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| 136 | getDefinition(type, kind, ctx, forceShared = false) {
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| 137 | const definitions = this.definitionsOf(kind);
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| 138 | let fixup = definitions.get(type);
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| 139 | let newValue = false;
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| 140 | if (!fixup) {
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| 141 | const property = this.propertyNameOf(kind);
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| 142 | fixup = new FixupExpression(ctx.importExpr(type).prop(property));
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| 143 | definitions.set(type, fixup);
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| 144 | newValue = true;
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| 145 | }
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| 146 | if ((!newValue && !fixup.shared) || (newValue && forceShared)) {
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| 147 | const name = this.freshName();
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| 148 | this.statements.push(o.variable(name).set(fixup.resolved).toDeclStmt(o.INFERRED_TYPE, [o.StmtModifier.Final]));
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| 149 | fixup.fixup(o.variable(name));
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| 150 | }
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| 151 | return fixup;
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| 152 | }
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| 153 | getLiteralFactory(literal) {
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| 154 | // Create a pure function that builds an array of a mix of constant and variable expressions
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| 155 | if (literal instanceof o.LiteralArrayExpr) {
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| 156 | const argumentsForKey = literal.entries.map(e => e.isConstant() ? e : UNKNOWN_VALUE_KEY);
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| 157 | const key = this.keyOf(o.literalArr(argumentsForKey));
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| 158 | return this._getLiteralFactory(key, literal.entries, entries => o.literalArr(entries));
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| 159 | }
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| 160 | else {
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| 161 | const expressionForKey = o.literalMap(literal.entries.map(e => ({
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| 162 | key: e.key,
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| 163 | value: e.value.isConstant() ? e.value : UNKNOWN_VALUE_KEY,
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| 164 | quoted: e.quoted
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| 165 | })));
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| 166 | const key = this.keyOf(expressionForKey);
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| 167 | return this._getLiteralFactory(key, literal.entries.map(e => e.value), entries => o.literalMap(entries.map((value, index) => ({
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| 168 | key: literal.entries[index].key,
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| 169 | value,
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| 170 | quoted: literal.entries[index].quoted
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| 171 | }))));
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| 172 | }
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| 173 | }
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| 174 | _getLiteralFactory(key, values, resultMap) {
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| 175 | let literalFactory = this.literalFactories.get(key);
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| 176 | const literalFactoryArguments = values.filter((e => !e.isConstant()));
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| 177 | if (!literalFactory) {
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| 178 | const resultExpressions = values.map((e, index) => e.isConstant() ? this.getConstLiteral(e, true) : o.variable(`a${index}`));
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| 179 | const parameters = resultExpressions.filter(isVariable).map(e => new o.FnParam(e.name, o.DYNAMIC_TYPE));
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| 180 | const pureFunctionDeclaration = o.fn(parameters, [new o.ReturnStatement(resultMap(resultExpressions))], o.INFERRED_TYPE);
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| 181 | const name = this.freshName();
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| 182 | this.statements.push(o.variable(name).set(pureFunctionDeclaration).toDeclStmt(o.INFERRED_TYPE, [
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| 183 | o.StmtModifier.Final
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| 184 | ]));
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| 185 | literalFactory = o.variable(name);
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| 186 | this.literalFactories.set(key, literalFactory);
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| 187 | }
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| 188 | return { literalFactory, literalFactoryArguments };
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| 189 | }
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| 190 | /**
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| 191 | * Produce a unique name.
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| 192 | *
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| 193 | * The name might be unique among different prefixes if any of the prefixes end in
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| 194 | * a digit so the prefix should be a constant string (not based on user input) and
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| 195 | * must not end in a digit.
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| 196 | */
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| 197 | uniqueName(prefix) {
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| 198 | return `${prefix}${this.nextNameIndex++}`;
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| 199 | }
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| 200 | definitionsOf(kind) {
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| 201 | switch (kind) {
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| 202 | case 2 /* Component */:
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| 203 | return this.componentDefinitions;
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| 204 | case 1 /* Directive */:
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| 205 | return this.directiveDefinitions;
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| 206 | case 0 /* Injector */:
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| 207 | return this.injectorDefinitions;
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| 208 | case 3 /* Pipe */:
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| 209 | return this.pipeDefinitions;
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| 210 | }
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| 211 | }
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| 212 | propertyNameOf(kind) {
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| 213 | switch (kind) {
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| 214 | case 2 /* Component */:
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| 215 | return 'ɵcmp';
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| 216 | case 1 /* Directive */:
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| 217 | return 'ɵdir';
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| 218 | case 0 /* Injector */:
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| 219 | return 'ɵinj';
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| 220 | case 3 /* Pipe */:
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| 221 | return 'ɵpipe';
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| 222 | }
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| 223 | }
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| 224 | freshName() {
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| 225 | return this.uniqueName(CONSTANT_PREFIX);
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| 226 | }
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| 227 | keyOf(expression) {
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| 228 | return expression.visitExpression(new KeyVisitor(), KEY_CONTEXT);
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| 229 | }
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| 230 | }
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| 231 | /**
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| 232 | * Visitor used to determine if 2 expressions are equivalent and can be shared in the
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| 233 | * `ConstantPool`.
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| 234 | *
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| 235 | * When the id (string) generated by the visitor is equal, expressions are considered equivalent.
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| 236 | */
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| 237 | class KeyVisitor {
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| 238 | constructor() {
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| 239 | this.visitWrappedNodeExpr = invalid;
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| 240 | this.visitWriteVarExpr = invalid;
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| 241 | this.visitWriteKeyExpr = invalid;
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| 242 | this.visitWritePropExpr = invalid;
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| 243 | this.visitInvokeMethodExpr = invalid;
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| 244 | this.visitInvokeFunctionExpr = invalid;
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| 245 | this.visitTaggedTemplateExpr = invalid;
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| 246 | this.visitInstantiateExpr = invalid;
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| 247 | this.visitConditionalExpr = invalid;
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| 248 | this.visitNotExpr = invalid;
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| 249 | this.visitAssertNotNullExpr = invalid;
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| 250 | this.visitCastExpr = invalid;
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| 251 | this.visitFunctionExpr = invalid;
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| 252 | this.visitUnaryOperatorExpr = invalid;
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| 253 | this.visitBinaryOperatorExpr = invalid;
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| 254 | this.visitReadPropExpr = invalid;
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| 255 | this.visitReadKeyExpr = invalid;
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| 256 | this.visitCommaExpr = invalid;
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| 257 | this.visitLocalizedString = invalid;
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| 258 | }
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| 259 | visitLiteralExpr(ast) {
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| 260 | return `${typeof ast.value === 'string' ? '"' + ast.value + '"' : ast.value}`;
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| 261 | }
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| 262 | visitLiteralArrayExpr(ast, context) {
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| 263 | return `[${ast.entries.map(entry => entry.visitExpression(this, context)).join(',')}]`;
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| 264 | }
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| 265 | visitLiteralMapExpr(ast, context) {
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| 266 | const mapKey = (entry) => {
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| 267 | const quote = entry.quoted ? '"' : '';
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| 268 | return `${quote}${entry.key}${quote}`;
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| 269 | };
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| 270 | const mapEntry = (entry) => `${mapKey(entry)}:${entry.value.visitExpression(this, context)}`;
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| 271 | return `{${ast.entries.map(mapEntry).join(',')}`;
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| 272 | }
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| 273 | visitExternalExpr(ast) {
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| 274 | return ast.value.moduleName ? `EX:${ast.value.moduleName}:${ast.value.name}` :
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| 275 | `EX:${ast.value.runtime.name}`;
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| 276 | }
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| 277 | visitReadVarExpr(node) {
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| 278 | return `VAR:${node.name}`;
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| 279 | }
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| 280 | visitTypeofExpr(node, context) {
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| 281 | return `TYPEOF:${node.expr.visitExpression(this, context)}`;
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| 282 | }
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| 283 | }
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| 284 | function invalid(arg) {
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| 285 | throw new Error(`Invalid state: Visitor ${this.constructor.name} doesn't handle ${arg.constructor.name}`);
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| 286 | }
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| 287 | function isVariable(e) {
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| 288 | return e instanceof o.ReadVarExpr;
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| 289 | }
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| 290 | function isLongStringLiteral(expr) {
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| 291 | return expr instanceof o.LiteralExpr && typeof expr.value === 'string' &&
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| 292 | expr.value.length >= POOL_INCLUSION_LENGTH_THRESHOLD_FOR_STRINGS;
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| 293 | }
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| 294 | //# 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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  visitInvokeMethodExpr = 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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