5aabe93abe
NOTE: This change must be reverted with previous deletes so that it code remains in build-able state. This change deletes old styling code and replaces it with a simplified styling algorithm. The mental model for the new algorithm is: - Create a linked list of styling bindings in the order of priority. All styling bindings ere executed in compiled order and than a linked list of bindings is created in priority order. - Flush the style bindings at the end of `advance()` instruction. This implies that there are two flush events. One at the end of template `advance` instruction in the template. Second one at the end of `hostBindings` `advance` instruction when processing host bindings (if any). - Each binding instructions effectively updates the string to represent the string at that location. Because most of the bindings are additive, this is a cheap strategy in most cases. In rare cases the strategy requires removing tokens from the styling up to this point. (We expect that to be rare case)S Because, the bindings are presorted in the order of priority, it is safe to resume the processing of the concatenated string from the last change binding. PR Close #34616
623 lines
22 KiB
TypeScript
623 lines
22 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {ConstantPool} from '../../constant_pool';
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import {AttributeMarker} from '../../core';
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import {AST, ASTWithSource, BindingPipe, BindingType, Interpolation} from '../../expression_parser/ast';
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import * as o from '../../output/output_ast';
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import {ParseSourceSpan} from '../../parse_util';
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import {isEmptyExpression} from '../../template_parser/template_parser';
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import * as t from '../r3_ast';
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import {Identifiers as R3} from '../r3_identifiers';
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import {hyphenate, parse as parseStyle} from './style_parser';
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import {ValueConverter} from './template';
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import {DefinitionMap, getInterpolationArgsLength} from './util';
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const IMPORTANT_FLAG = '!important';
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/**
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* Minimum amount of binding slots required in the runtime for style/class bindings.
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*
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* Styling in Angular uses up two slots in the runtime LView/TData data structures to
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* record binding data, property information and metadata.
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*
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* When a binding is registered it will place the following information in the `LView`:
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*
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* slot 1) binding value
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* slot 2) cached value (all other values collected before it in string form)
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*
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* When a binding is registered it will place the following information in the `TData`:
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*
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* slot 1) prop name
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* slot 2) binding index that points to the previous style/class binding (and some extra config
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* values)
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*
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* Let's imagine we have a binding that looks like so:
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*
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* ```
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* <div [style.width]="x" [style.height]="y">
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* ```
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*
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* Our `LView` and `TData` data-structures look like so:
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*
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* ```typescript
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* LView = [
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* // ...
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* x, // value of x
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* "width: x",
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*
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* y, // value of y
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* "width: x; height: y",
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* // ...
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* ];
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*
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* TData = [
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* // ...
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* "width", // binding slot 20
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* 0,
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*
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* "height",
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* 20,
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* // ...
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* ];
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* ```
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*
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* */
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export const MIN_STYLING_BINDING_SLOTS_REQUIRED = 2;
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/**
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* A styling expression summary that is to be processed by the compiler
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*/
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export interface StylingInstruction {
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reference: o.ExternalReference;
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/** Calls to individual styling instructions. Used when chaining calls to the same instruction. */
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calls: StylingInstructionCall[];
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}
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export interface StylingInstructionCall {
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sourceSpan: ParseSourceSpan|null;
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supportsInterpolation?: boolean;
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allocateBindingSlots: number;
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params: ((convertFn: (value: any) => o.Expression | o.Expression[]) => o.Expression[]);
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}
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/**
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* An internal record of the input data for a styling binding
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*/
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interface BoundStylingEntry {
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hasOverrideFlag: boolean;
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name: string|null;
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unit: string|null;
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sourceSpan: ParseSourceSpan;
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sanitize: boolean;
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value: AST;
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}
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/**
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* Produces creation/update instructions for all styling bindings (class and style)
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*
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* It also produces the creation instruction to register all initial styling values
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* (which are all the static class="..." and style="..." attribute values that exist
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* on an element within a template).
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*
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* The builder class below handles producing instructions for the following cases:
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*
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* - Static style/class attributes (style="..." and class="...")
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* - Dynamic style/class map bindings ([style]="map" and [class]="map|string")
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* - Dynamic style/class property bindings ([style.prop]="exp" and [class.name]="exp")
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*
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* Due to the complex relationship of all of these cases, the instructions generated
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* for these attributes/properties/bindings must be done so in the correct order. The
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* order which these must be generated is as follows:
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*
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* if (createMode) {
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* styling(...)
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* }
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* if (updateMode) {
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* styleMap(...)
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* classMap(...)
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* styleProp(...)
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* classProp(...)
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* }
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*
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* The creation/update methods within the builder class produce these instructions.
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*/
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export class StylingBuilder {
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/** Whether or not there are any static styling values present */
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private _hasInitialValues = false;
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/**
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* Whether or not there are any styling bindings present
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* (i.e. `[style]`, `[class]`, `[style.prop]` or `[class.name]`)
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*/
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public hasBindings = false;
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public hasBindingsWithPipes = false;
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/** the input for [class] (if it exists) */
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private _classMapInput: BoundStylingEntry|null = null;
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/** the input for [style] (if it exists) */
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private _styleMapInput: BoundStylingEntry|null = null;
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/** an array of each [style.prop] input */
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private _singleStyleInputs: BoundStylingEntry[]|null = null;
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/** an array of each [class.name] input */
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private _singleClassInputs: BoundStylingEntry[]|null = null;
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private _lastStylingInput: BoundStylingEntry|null = null;
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private _firstStylingInput: BoundStylingEntry|null = null;
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// maps are used instead of hash maps because a Map will
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// retain the ordering of the keys
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/**
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* Represents the location of each style binding in the template
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* (e.g. `<div [style.width]="w" [style.height]="h">` implies
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* that `width=0` and `height=1`)
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*/
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private _stylesIndex = new Map<string, number>();
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/**
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* Represents the location of each class binding in the template
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* (e.g. `<div [class.big]="b" [class.hidden]="h">` implies
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* that `big=0` and `hidden=1`)
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*/
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private _classesIndex = new Map<string, number>();
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private _initialStyleValues: string[] = [];
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private _initialClassValues: string[] = [];
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constructor(private _elementIndexExpr: o.Expression, private _directiveExpr: o.Expression|null) {}
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/**
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* Registers a given input to the styling builder to be later used when producing AOT code.
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*
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* The code below will only accept the input if it is somehow tied to styling (whether it be
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* style/class bindings or static style/class attributes).
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*/
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registerBoundInput(input: t.BoundAttribute): boolean {
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// [attr.style] or [attr.class] are skipped in the code below,
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// they should not be treated as styling-based bindings since
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// they are intended to be written directly to the attr and
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// will therefore skip all style/class resolution that is present
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// with style="", [style]="" and [style.prop]="", class="",
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// [class.prop]="". [class]="" assignments
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let binding: BoundStylingEntry|null = null;
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let name = input.name;
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switch (input.type) {
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case BindingType.Property:
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binding = this.registerInputBasedOnName(name, input.value, input.sourceSpan);
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break;
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case BindingType.Style:
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binding = this.registerStyleInput(name, false, input.value, input.sourceSpan, input.unit);
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break;
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case BindingType.Class:
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binding = this.registerClassInput(name, false, input.value, input.sourceSpan);
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break;
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}
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return binding ? true : false;
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}
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registerInputBasedOnName(name: string, expression: AST, sourceSpan: ParseSourceSpan) {
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let binding: BoundStylingEntry|null = null;
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const prefix = name.substring(0, 6);
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const isStyle = name === 'style' || prefix === 'style.' || prefix === 'style!';
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const isClass = !isStyle &&
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(name === 'class' || name === 'className' || prefix === 'class.' || prefix === 'class!');
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if (isStyle || isClass) {
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const isMapBased = name.charAt(5) !== '.'; // style.prop or class.prop makes this a no
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const property = name.substr(isMapBased ? 5 : 6); // the dot explains why there's a +1
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if (isStyle) {
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binding = this.registerStyleInput(property, isMapBased, expression, sourceSpan);
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} else {
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binding = this.registerClassInput(property, isMapBased, expression, sourceSpan);
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}
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}
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return binding;
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}
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registerStyleInput(
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name: string, isMapBased: boolean, value: AST, sourceSpan: ParseSourceSpan,
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unit?: string|null): BoundStylingEntry|null {
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if (isEmptyExpression(value)) {
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return null;
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}
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name = normalizePropName(name);
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const {property, hasOverrideFlag, unit: bindingUnit} = parseProperty(name);
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const entry: BoundStylingEntry = {
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name: property,
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sanitize: property ? isStyleSanitizable(property) : true,
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unit: unit || bindingUnit, value, sourceSpan, hasOverrideFlag
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};
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if (isMapBased) {
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this._styleMapInput = entry;
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} else {
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(this._singleStyleInputs = this._singleStyleInputs || []).push(entry);
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registerIntoMap(this._stylesIndex, property);
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}
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this._lastStylingInput = entry;
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this._firstStylingInput = this._firstStylingInput || entry;
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this._checkForPipes(value);
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this.hasBindings = true;
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return entry;
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}
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registerClassInput(name: string, isMapBased: boolean, value: AST, sourceSpan: ParseSourceSpan):
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BoundStylingEntry|null {
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if (isEmptyExpression(value)) {
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return null;
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}
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const {property, hasOverrideFlag} = parseProperty(name);
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const entry: BoundStylingEntry =
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{name: property, value, sourceSpan, sanitize: false, hasOverrideFlag, unit: null};
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if (isMapBased) {
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if (this._classMapInput) {
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throw new Error(
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'[class] and [className] bindings cannot be used on the same element simultaneously');
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}
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this._classMapInput = entry;
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} else {
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(this._singleClassInputs = this._singleClassInputs || []).push(entry);
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registerIntoMap(this._classesIndex, property);
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}
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this._lastStylingInput = entry;
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this._firstStylingInput = this._firstStylingInput || entry;
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this._checkForPipes(value);
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this.hasBindings = true;
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return entry;
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}
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private _checkForPipes(value: AST) {
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if ((value instanceof ASTWithSource) && (value.ast instanceof BindingPipe)) {
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this.hasBindingsWithPipes = true;
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}
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}
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/**
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* Registers the element's static style string value to the builder.
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*
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* @param value the style string (e.g. `width:100px; height:200px;`)
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*/
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registerStyleAttr(value: string) {
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this._initialStyleValues = parseStyle(value);
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this._hasInitialValues = true;
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}
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/**
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* Registers the element's static class string value to the builder.
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*
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* @param value the className string (e.g. `disabled gold zoom`)
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*/
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registerClassAttr(value: string) {
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this._initialClassValues = value.trim().split(/\s+/g);
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this._hasInitialValues = true;
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}
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/**
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* Appends all styling-related expressions to the provided attrs array.
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*
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* @param attrs an existing array where each of the styling expressions
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* will be inserted into.
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*/
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populateInitialStylingAttrs(attrs: o.Expression[]): void {
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// [CLASS_MARKER, 'foo', 'bar', 'baz' ...]
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if (this._initialClassValues.length) {
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attrs.push(o.literal(AttributeMarker.Classes));
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for (let i = 0; i < this._initialClassValues.length; i++) {
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attrs.push(o.literal(this._initialClassValues[i]));
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}
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}
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// [STYLE_MARKER, 'width', '200px', 'height', '100px', ...]
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if (this._initialStyleValues.length) {
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attrs.push(o.literal(AttributeMarker.Styles));
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for (let i = 0; i < this._initialStyleValues.length; i += 2) {
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attrs.push(
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o.literal(this._initialStyleValues[i]), o.literal(this._initialStyleValues[i + 1]));
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}
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}
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}
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/**
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* Builds an instruction with all the expressions and parameters for `elementHostAttrs`.
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*
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* The instruction generation code below is used for producing the AOT statement code which is
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* responsible for registering initial styles (within a directive hostBindings' creation block),
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* as well as any of the provided attribute values, to the directive host element.
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*/
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assignHostAttrs(attrs: o.Expression[], definitionMap: DefinitionMap): void {
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if (this._directiveExpr && (attrs.length || this._hasInitialValues)) {
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this.populateInitialStylingAttrs(attrs);
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definitionMap.set('hostAttrs', o.literalArr(attrs));
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}
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}
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/**
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* Builds an instruction with all the expressions and parameters for `classMap`.
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*
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* The instruction data will contain all expressions for `classMap` to function
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* which includes the `[class]` expression params.
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*/
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buildClassMapInstruction(valueConverter: ValueConverter): StylingInstruction|null {
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if (this._classMapInput) {
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return this._buildMapBasedInstruction(valueConverter, true, this._classMapInput);
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}
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return null;
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}
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/**
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* Builds an instruction with all the expressions and parameters for `styleMap`.
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*
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* The instruction data will contain all expressions for `styleMap` to function
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* which includes the `[style]` expression params.
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*/
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buildStyleMapInstruction(valueConverter: ValueConverter): StylingInstruction|null {
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if (this._styleMapInput) {
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return this._buildMapBasedInstruction(valueConverter, false, this._styleMapInput);
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}
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return null;
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}
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private _buildMapBasedInstruction(
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valueConverter: ValueConverter, isClassBased: boolean,
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stylingInput: BoundStylingEntry): StylingInstruction {
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// each styling binding value is stored in the LView
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// map-based bindings allocate two slots: one for the
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// previous binding value and another for the previous
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// className or style attribute value.
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let totalBindingSlotsRequired = MIN_STYLING_BINDING_SLOTS_REQUIRED;
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// these values must be outside of the update block so that they can
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// be evaluated (the AST visit call) during creation time so that any
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// pipes can be picked up in time before the template is built
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const mapValue = stylingInput.value.visit(valueConverter);
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let reference: o.ExternalReference;
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if (mapValue instanceof Interpolation && isClassBased) {
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totalBindingSlotsRequired += mapValue.expressions.length;
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reference = getClassMapInterpolationExpression(mapValue);
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} else {
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reference = isClassBased ? R3.classMap : R3.styleMap;
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}
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return {
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reference,
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calls: [{
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supportsInterpolation: isClassBased,
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sourceSpan: stylingInput.sourceSpan,
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allocateBindingSlots: totalBindingSlotsRequired,
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params: (convertFn: (value: any) => o.Expression | o.Expression[]) => {
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const convertResult = convertFn(mapValue);
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const params = Array.isArray(convertResult) ? convertResult : [convertResult];
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// [style] instructions will sanitize all their values. For this reason we
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// need to include the sanitizer as a param.
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if (!isClassBased) {
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params.push(o.importExpr(R3.defaultStyleSanitizer));
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}
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return params;
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}
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}]
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};
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}
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private _buildSingleInputs(
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reference: o.ExternalReference, inputs: BoundStylingEntry[], valueConverter: ValueConverter,
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getInterpolationExpressionFn: ((value: Interpolation) => o.ExternalReference)|null,
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isClassBased: boolean): StylingInstruction[] {
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const instructions: StylingInstruction[] = [];
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inputs.forEach(input => {
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const previousInstruction: StylingInstruction|undefined =
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instructions[instructions.length - 1];
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const value = input.value.visit(valueConverter);
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let referenceForCall = reference;
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// each styling binding value is stored in the LView
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// but there are two values stored for each binding:
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// 1) the value itself
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// 2) an intermediate value (concatenation of style up to this point).
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// We need to store the intermediate value so that we don't allocate
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// the strings on each CD.
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let totalBindingSlotsRequired = MIN_STYLING_BINDING_SLOTS_REQUIRED;
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if (value instanceof Interpolation) {
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totalBindingSlotsRequired += value.expressions.length;
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if (getInterpolationExpressionFn) {
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referenceForCall = getInterpolationExpressionFn(value);
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}
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}
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const call = {
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sourceSpan: input.sourceSpan,
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allocateBindingSlots: totalBindingSlotsRequired,
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supportsInterpolation: !!getInterpolationExpressionFn,
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params: (convertFn: (value: any) => o.Expression | o.Expression[]) => {
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// params => stylingProp(propName, value, suffix|sanitizer)
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const params: o.Expression[] = [];
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params.push(o.literal(input.name));
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const convertResult = convertFn(value);
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if (Array.isArray(convertResult)) {
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params.push(...convertResult);
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} else {
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params.push(convertResult);
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}
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// [style.prop] bindings may use suffix values (e.g. px, em, etc...) and they
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// can also use a sanitizer. Sanitization occurs for url-based entries. Having
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// the suffix value and a sanitizer together into the instruction doesn't make
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// any sense (url-based entries cannot be sanitized).
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if (!isClassBased) {
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if (input.unit) {
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params.push(o.literal(input.unit));
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} else if (input.sanitize) {
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params.push(o.importExpr(R3.defaultStyleSanitizer));
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}
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}
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return params;
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}
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};
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// If we ended up generating a call to the same instruction as the previous styling property
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// we can chain the calls together safely to save some bytes, otherwise we have to generate
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// a separate instruction call. This is primarily a concern with interpolation instructions
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// where we may start off with one `reference`, but end up using another based on the
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// number of interpolations.
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if (previousInstruction && previousInstruction.reference === referenceForCall) {
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previousInstruction.calls.push(call);
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} else {
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instructions.push({reference: referenceForCall, calls: [call]});
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}
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});
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return instructions;
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}
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private _buildClassInputs(valueConverter: ValueConverter): StylingInstruction[] {
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if (this._singleClassInputs) {
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return this._buildSingleInputs(
|
|
R3.classProp, this._singleClassInputs, valueConverter, null, true);
|
|
}
|
|
return [];
|
|
}
|
|
|
|
private _buildStyleInputs(valueConverter: ValueConverter): StylingInstruction[] {
|
|
if (this._singleStyleInputs) {
|
|
return this._buildSingleInputs(
|
|
R3.styleProp, this._singleStyleInputs, valueConverter,
|
|
getStylePropInterpolationExpression, false);
|
|
}
|
|
return [];
|
|
}
|
|
|
|
/**
|
|
* Constructs all instructions which contain the expressions that will be placed
|
|
* into the update block of a template function or a directive hostBindings function.
|
|
*/
|
|
buildUpdateLevelInstructions(valueConverter: ValueConverter) {
|
|
const instructions: StylingInstruction[] = [];
|
|
if (this.hasBindings) {
|
|
const styleMapInstruction = this.buildStyleMapInstruction(valueConverter);
|
|
if (styleMapInstruction) {
|
|
instructions.push(styleMapInstruction);
|
|
}
|
|
const classMapInstruction = this.buildClassMapInstruction(valueConverter);
|
|
if (classMapInstruction) {
|
|
instructions.push(classMapInstruction);
|
|
}
|
|
instructions.push(...this._buildStyleInputs(valueConverter));
|
|
instructions.push(...this._buildClassInputs(valueConverter));
|
|
}
|
|
return instructions;
|
|
}
|
|
}
|
|
|
|
function registerIntoMap(map: Map<string, number>, key: string) {
|
|
if (!map.has(key)) {
|
|
map.set(key, map.size);
|
|
}
|
|
}
|
|
|
|
function isStyleSanitizable(prop: string): boolean {
|
|
// Note that browsers support both the dash case and
|
|
// camel case property names when setting through JS.
|
|
return prop === 'background-image' || prop === 'backgroundImage' || prop === 'background' ||
|
|
prop === 'border-image' || prop === 'borderImage' || prop === 'border-image-source' ||
|
|
prop === 'borderImageSource' || prop === 'filter' || prop === 'list-style' ||
|
|
prop === 'listStyle' || prop === 'list-style-image' || prop === 'listStyleImage' ||
|
|
prop === 'clip-path' || prop === 'clipPath';
|
|
}
|
|
|
|
/**
|
|
* Simple helper function to either provide the constant literal that will house the value
|
|
* here or a null value if the provided values are empty.
|
|
*/
|
|
function getConstantLiteralFromArray(
|
|
constantPool: ConstantPool, values: o.Expression[]): o.Expression {
|
|
return values.length ? constantPool.getConstLiteral(o.literalArr(values), true) : o.NULL_EXPR;
|
|
}
|
|
|
|
export function parseProperty(name: string):
|
|
{property: string, unit: string, hasOverrideFlag: boolean} {
|
|
let hasOverrideFlag = false;
|
|
const overrideIndex = name.indexOf(IMPORTANT_FLAG);
|
|
if (overrideIndex !== -1) {
|
|
name = overrideIndex > 0 ? name.substring(0, overrideIndex) : '';
|
|
hasOverrideFlag = true;
|
|
}
|
|
|
|
let unit = '';
|
|
let property = name;
|
|
const unitIndex = name.lastIndexOf('.');
|
|
if (unitIndex > 0) {
|
|
unit = name.substr(unitIndex + 1);
|
|
property = name.substring(0, unitIndex);
|
|
}
|
|
|
|
return {property, unit, hasOverrideFlag};
|
|
}
|
|
|
|
/**
|
|
* Gets the instruction to generate for an interpolated class map.
|
|
* @param interpolation An Interpolation AST
|
|
*/
|
|
function getClassMapInterpolationExpression(interpolation: Interpolation): o.ExternalReference {
|
|
switch (getInterpolationArgsLength(interpolation)) {
|
|
case 1:
|
|
return R3.classMap;
|
|
case 3:
|
|
return R3.classMapInterpolate1;
|
|
case 5:
|
|
return R3.classMapInterpolate2;
|
|
case 7:
|
|
return R3.classMapInterpolate3;
|
|
case 9:
|
|
return R3.classMapInterpolate4;
|
|
case 11:
|
|
return R3.classMapInterpolate5;
|
|
case 13:
|
|
return R3.classMapInterpolate6;
|
|
case 15:
|
|
return R3.classMapInterpolate7;
|
|
case 17:
|
|
return R3.classMapInterpolate8;
|
|
default:
|
|
return R3.classMapInterpolateV;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets the instruction to generate for an interpolated style prop.
|
|
* @param interpolation An Interpolation AST
|
|
*/
|
|
function getStylePropInterpolationExpression(interpolation: Interpolation) {
|
|
switch (getInterpolationArgsLength(interpolation)) {
|
|
case 1:
|
|
return R3.styleProp;
|
|
case 3:
|
|
return R3.stylePropInterpolate1;
|
|
case 5:
|
|
return R3.stylePropInterpolate2;
|
|
case 7:
|
|
return R3.stylePropInterpolate3;
|
|
case 9:
|
|
return R3.stylePropInterpolate4;
|
|
case 11:
|
|
return R3.stylePropInterpolate5;
|
|
case 13:
|
|
return R3.stylePropInterpolate6;
|
|
case 15:
|
|
return R3.stylePropInterpolate7;
|
|
case 17:
|
|
return R3.stylePropInterpolate8;
|
|
default:
|
|
return R3.stylePropInterpolateV;
|
|
}
|
|
}
|
|
|
|
function normalizePropName(prop: string): string {
|
|
return hyphenate(prop);
|
|
}
|