@angular/compiler/esm2020/src/render3/util.mjs

/**
 * @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 { escapeIdentifier } from '../output/abstract_emitter';
import * as o from '../output/output_ast';
import { Identifiers } from './r3_identifiers';
export function typeWithParameters(type, numParams) {
    if (numParams === 0) {
        return o.expressionType(type);
    }
    const params = [];
    for (let i = 0; i < numParams; i++) {
        params.push(o.DYNAMIC_TYPE);
    }
    return o.expressionType(type, undefined, params);
}
const ANIMATE_SYMBOL_PREFIX = '@';
export function prepareSyntheticPropertyName(name) {
    return `${ANIMATE_SYMBOL_PREFIX}${name}`;
}
export function prepareSyntheticListenerName(name, phase) {
    return `${ANIMATE_SYMBOL_PREFIX}${name}.${phase}`;
}
export function getSafePropertyAccessString(accessor, name) {
    const escapedName = escapeIdentifier(name, false, false);
    return escapedName !== name ? `${accessor}[${escapedName}]` : `${accessor}.${name}`;
}
export function prepareSyntheticListenerFunctionName(name, phase) {
    return `animation_${name}_${phase}`;
}
export function jitOnlyGuardedExpression(expr) {
    return guardedExpression('ngJitMode', expr);
}
export function devOnlyGuardedExpression(expr) {
    return guardedExpression('ngDevMode', expr);
}
export function guardedExpression(guard, expr) {
    const guardExpr = new o.ExternalExpr({ name: guard, moduleName: null });
    const guardNotDefined = new o.BinaryOperatorExpr(o.BinaryOperator.Identical, new o.TypeofExpr(guardExpr), o.literal('undefined'));
    const guardUndefinedOrTrue = new o.BinaryOperatorExpr(o.BinaryOperator.Or, guardNotDefined, guardExpr, /* type */ undefined, 
    /* sourceSpan */ undefined, true);
    return new o.BinaryOperatorExpr(o.BinaryOperator.And, guardUndefinedOrTrue, expr);
}
export function wrapReference(value) {
    const wrapped = new o.WrappedNodeExpr(value);
    return { value: wrapped, type: wrapped };
}
export function refsToArray(refs, shouldForwardDeclare) {
    const values = o.literalArr(refs.map(ref => ref.value));
    return shouldForwardDeclare ? o.fn([], [new o.ReturnStatement(values)]) : values;
}
export function createMayBeForwardRefExpression(expression, forwardRef) {
    return { expression, forwardRef };
}
/**
 * Convert a `MaybeForwardRefExpression` to an `Expression`, possibly wrapping its expression in a
 * `forwardRef()` call.
 *
 * If `MaybeForwardRefExpression.forwardRef` is `ForwardRefHandling.Unwrapped` then the expression
 * was originally wrapped in a `forwardRef()` call to prevent the value from being eagerly evaluated
 * in the code.
 *
 * See `packages/compiler-cli/src/ngtsc/annotations/src/injectable.ts` and
 * `packages/compiler/src/jit_compiler_facade.ts` for more information.
 */
export function convertFromMaybeForwardRefExpression({ expression, forwardRef }) {
    switch (forwardRef) {
        case 0 /* None */:
        case 1 /* Wrapped */:
            return expression;
        case 2 /* Unwrapped */:
            return generateForwardRef(expression);
    }
}
/**
 * Generate an expression that has the given `expr` wrapped in the following form:
 *
 * ```
 * forwardRef(() => expr)
 * ```
 */
export function generateForwardRef(expr) {
    return o.importExpr(Identifiers.forwardRef).callFn([o.fn([], [new o.ReturnStatement(expr)])]);
}
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`${accessor}[${escapedName}]` : `${accessor}.${name}`;\n}\n\nexport function prepareSyntheticListenerFunctionName(name: string, phase: string) {\n  return `animation_${name}_${phase}`;\n}\n\nexport function jitOnlyGuardedExpression(expr: o.Expression): o.Expression {\n  return guardedExpression('ngJitMode', expr);\n}\n\nexport function devOnlyGuardedExpression(expr: o.Expression): o.Expression {\n  return guardedExpression('ngDevMode', expr);\n}\n\nexport function guardedExpression(guard: string, expr: o.Expression): o.Expression {\n  const guardExpr = new o.ExternalExpr({name: guard, moduleName: null});\n  const guardNotDefined = new o.BinaryOperatorExpr(\n      o.BinaryOperator.Identical, new o.TypeofExpr(guardExpr), o.literal('undefined'));\n  const guardUndefinedOrTrue = new o.BinaryOperatorExpr(\n      o.BinaryOperator.Or, guardNotDefined, guardExpr, /* type */ undefined,\n      /* sourceSpan */ undefined, true);\n  return new o.BinaryOperatorExpr(o.BinaryOperator.And, guardUndefinedOrTrue, expr);\n}\n\nexport function wrapReference(value: any): R3Reference {\n  const wrapped = new o.WrappedNodeExpr(value);\n  return {value: wrapped, type: wrapped};\n}\n\nexport function refsToArray(refs: R3Reference[], shouldForwardDeclare: boolean): o.Expression {\n  const values = o.literalArr(refs.map(ref => ref.value));\n  return shouldForwardDeclare ? o.fn([], [new o.ReturnStatement(values)]) : values;\n}\n\n\n/**\n * Describes an expression that may have been wrapped in a `forwardRef()` guard.\n *\n * This is used when describing expressions that can refer to types that may eagerly reference types\n * that have not yet been defined.\n */\nexport interface MaybeForwardRefExpression<T extends o.Expression = o.Expression> {\n  /**\n   * The unwrapped expression.\n   */\n  expression: T;\n  /**\n   * Specified whether the `expression` contains a reference to something that has not yet been\n   * defined, and whether the expression is still wrapped in a `forwardRef()` call.\n   *\n   * If this value is `ForwardRefHandling.None` then the `expression` is safe to use as-is.\n   *\n   * Otherwise the `expression` was wrapped in a call to `forwardRef()` and must not be eagerly\n   * evaluated. Instead it must be wrapped in a function closure that will be evaluated lazily to\n   * allow the definition of the expression to be evaluated first.\n   *\n   * In full AOT compilation it can be safe to unwrap the `forwardRef()` call up front if the\n   * expression will actually be evaluated lazily inside a function call after the value of\n   * `expression` has been defined.\n   *\n   * But in other cases, such as partial AOT compilation or JIT compilation the expression will be\n   * evaluated eagerly in top level code so will need to continue to be wrapped in a `forwardRef()`\n   * call.\n   *\n   */\n  forwardRef: ForwardRefHandling;\n}\n\nexport function createMayBeForwardRefExpression<T extends o.Expression>(\n    expression: T, forwardRef: ForwardRefHandling): MaybeForwardRefExpression<T> {\n  return {expression, forwardRef};\n}\n\n/**\n * Convert a `MaybeForwardRefExpression` to an `Expression`, possibly wrapping its expression in a\n * `forwardRef()` call.\n *\n * If `MaybeForwardRefExpression.forwardRef` is `ForwardRefHandling.Unwrapped` then the expression\n * was originally wrapped in a `forwardRef()` call to prevent the value from being eagerly evaluated\n * in the code.\n *\n * See `packages/compiler-cli/src/ngtsc/annotations/src/injectable.ts` and\n * `packages/compiler/src/jit_compiler_facade.ts` for more information.\n */\nexport function convertFromMaybeForwardRefExpression(\n    {expression, forwardRef}: MaybeForwardRefExpression): o.Expression {\n  switch (forwardRef) {\n    case ForwardRefHandling.None:\n    case ForwardRefHandling.Wrapped:\n      return expression;\n    case ForwardRefHandling.Unwrapped:\n      return generateForwardRef(expression);\n  }\n}\n\n/**\n * Generate an expression that has the given `expr` wrapped in the following form:\n *\n * ```\n * forwardRef(() => expr)\n * ```\n */\nexport function generateForwardRef(expr: o.Expression): o.Expression {\n  return o.importExpr(Identifiers.forwardRef).callFn([o.fn([], [new o.ReturnStatement(expr)])]);\n}\n\n/**\n * Specifies how a forward ref has been handled in a MaybeForwardRefExpression\n */\nexport const enum ForwardRefHandling {\n  /** The expression was not wrapped in a `forwardRef()` call in the first place. */\n  None,\n  /** The expression is still wrapped in a `forwardRef()` call. */\n  Wrapped,\n  /** The expression was wrapped in a `forwardRef()` call but has since been unwrapped. */\n  Unwrapped,\n}\n"]}