Use css parser to add hover class name to selectors.
Previously we use a regexp to match all the CSS selectors and add our hover class name to it, which has been proved not solid and may be very slow in some situation. Using a production ready css parser can handle this better and also provide ability's to do more accurate things to the recorded stylesheets.
This commit is contained in:
Yanzhen Yu
909
src/css.ts
Normal file
909
src/css.ts
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@@ -0,0 +1,909 @@
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/**
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* This file is a fork of https://github.com/reworkcss/css/blob/master/lib/parse/index.js
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* I fork it because:
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* 1. The css library was built for node.js which does not have tree-shaking supports.
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* 2. Rewrites into typescript give us a better type interface.
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*/
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/* tslint:disable no-conditional-assignment interface-name no-shadowed-variable */
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export interface ParserOptions {
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/** Silently fail on parse errors */
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silent?: boolean;
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/**
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* The path to the file containing css.
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* Makes errors and source maps more helpful, by letting them know where code comes from.
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*/
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source?: string;
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}
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/**
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* Error thrown during parsing.
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*/
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export interface ParserError {
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/** The full error message with the source position. */
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message?: string;
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/** The error message without position. */
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reason?: string;
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/** The value of options.source if passed to css.parse. Otherwise undefined. */
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filename?: string;
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line?: number;
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column?: number;
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/** The portion of code that couldn't be parsed. */
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source?: string;
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}
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export interface Loc {
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line?: number;
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column?: number;
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}
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/**
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* Base AST Tree Node.
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*/
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export interface Node {
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/** The possible values are the ones listed in the Types section on https://github.com/reworkcss/css page. */
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type?: string;
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/** A reference to the parent node, or null if the node has no parent. */
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parent?: Node;
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/** Information about the position in the source string that corresponds to the node. */
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position?: {
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start?: Loc;
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end?: Loc;
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/** The value of options.source if passed to css.parse. Otherwise undefined. */
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source?: string;
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/** The full source string passed to css.parse. */
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content?: string;
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};
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}
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export interface Rule extends Node {
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/** The list of selectors of the rule, split on commas. Each selector is trimmed from whitespace and comments. */
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selectors?: string[];
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/** Array of nodes with the types declaration and comment. */
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declarations?: Array<Declaration | Comment>;
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}
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export interface Declaration extends Node {
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/** The property name, trimmed from whitespace and comments. May not be empty. */
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property?: string;
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/** The value of the property, trimmed from whitespace and comments. Empty values are allowed. */
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value?: string;
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}
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/**
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* A rule-level or declaration-level comment. Comments inside selectors, properties and values etc. are lost.
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*/
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export interface Comment extends Node {
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comment?: string;
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}
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/**
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* The @charset at-rule.
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*/
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export interface Charset extends Node {
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/** The part following @charset. */
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charset?: string;
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}
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/**
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* The @custom-media at-rule
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*/
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export interface CustomMedia extends Node {
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/** The ---prefixed name. */
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name?: string;
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/** The part following the name. */
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media?: string;
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}
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/**
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* The @document at-rule.
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*/
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export interface Document extends Node {
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/** The part following @document. */
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document?: string;
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/** The vendor prefix in @document, or undefined if there is none. */
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vendor?: string;
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/** Array of nodes with the types rule, comment and any of the at-rule types. */
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rules?: Array<Rule | Comment | AtRule>;
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}
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/**
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* The @font-face at-rule.
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*/
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export interface FontFace extends Node {
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/** Array of nodes with the types declaration and comment. */
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declarations?: Array<Declaration | Comment>;
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}
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/**
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* The @host at-rule.
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*/
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export interface Host extends Node {
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/** Array of nodes with the types rule, comment and any of the at-rule types. */
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rules?: Array<Rule | Comment | AtRule>;
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}
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/**
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* The @import at-rule.
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*/
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export interface Import extends Node {
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/** The part following @import. */
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import?: string;
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}
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/**
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* The @keyframes at-rule.
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*/
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export interface KeyFrames extends Node {
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/** The name of the keyframes rule. */
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name?: string;
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/** The vendor prefix in @keyframes, or undefined if there is none. */
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vendor?: string;
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/** Array of nodes with the types keyframe and comment. */
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keyframes?: Array<KeyFrame | Comment>;
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}
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export interface KeyFrame extends Node {
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/** The list of "selectors" of the keyframe rule, split on commas. Each “selector” is trimmed from whitespace. */
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values?: string[];
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/** Array of nodes with the types declaration and comment. */
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declarations?: Array<Declaration | Comment>;
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}
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/**
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* The @media at-rule.
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*/
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export interface Media extends Node {
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/** The part following @media. */
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media?: string;
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/** Array of nodes with the types rule, comment and any of the at-rule types. */
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rules?: Array<Rule | Comment | AtRule>;
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}
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/**
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* The @namespace at-rule.
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*/
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export interface Namespace extends Node {
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/** The part following @namespace. */
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namespace?: string;
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}
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/**
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* The @page at-rule.
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*/
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export interface Page extends Node {
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/** The list of selectors of the rule, split on commas. Each selector is trimmed from whitespace and comments. */
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selectors?: string[];
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/** Array of nodes with the types declaration and comment. */
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declarations?: Array<Declaration | Comment>;
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}
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/**
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* The @supports at-rule.
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*/
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export interface Supports extends Node {
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/** The part following @supports. */
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supports?: string;
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/** Array of nodes with the types rule, comment and any of the at-rule types. */
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rules?: Array<Rule | Comment | AtRule>;
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}
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/** All at-rules. */
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export type AtRule =
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| Charset
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| CustomMedia
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| Document
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| FontFace
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| Host
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| Import
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| KeyFrames
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| Media
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| Namespace
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| Page
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| Supports;
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/**
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* A collection of rules
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*/
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export interface StyleRules {
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source?: string;
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/** Array of nodes with the types rule, comment and any of the at-rule types. */
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rules: Array<Rule | Comment | AtRule>;
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/** Array of Errors. Errors collected during parsing when option silent is true. */
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parsingErrors?: ParserError[];
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}
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/**
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* The root node returned by css.parse.
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*/
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export interface Stylesheet extends Node {
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stylesheet?: StyleRules;
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}
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// http://www.w3.org/TR/CSS21/grammar.html
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// https://github.com/visionmedia/css-parse/pull/49#issuecomment-30088027
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const commentre = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//g;
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export function parse(css: string, options: ParserOptions = {}) {
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/**
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* Positional.
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*/
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let lineno = 1;
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let column = 1;
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/**
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* Update lineno and column based on `str`.
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*/
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function updatePosition(str: string) {
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const lines = str.match(/\n/g);
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if (lines) {
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lineno += lines.length;
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}
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let i = str.lastIndexOf('\n');
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column = i === -1 ? column + str.length : str.length - i;
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}
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/**
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* Mark position and patch `node.position`.
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*/
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function position() {
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const start = { line: lineno, column };
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return (
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node: Rule | Declaration | Comment | AtRule | Stylesheet | KeyFrame,
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) => {
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node.position = new Position(start);
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whitespace();
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return node;
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};
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}
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/**
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* Store position information for a node
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*/
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class Position {
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public content!: string;
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public start!: Loc;
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public end!: Loc;
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public source?: string;
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constructor(start: Loc) {
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this.start = start;
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this.end = { line: lineno, column };
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this.source = options.source;
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}
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}
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/**
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* Non-enumerable source string
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*/
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Position.prototype.content = css;
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const errorsList: ParserError[] = [];
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function error(msg: string) {
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const err = new Error(
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options.source + ':' + lineno + ':' + column + ': ' + msg,
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) as ParserError;
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err.reason = msg;
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err.filename = options.source;
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err.line = lineno;
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err.column = column;
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err.source = css;
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if (options.silent) {
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errorsList.push(err);
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} else {
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throw err;
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}
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}
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/**
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* Parse stylesheet.
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*/
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function stylesheet(): Stylesheet {
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const rulesList = rules();
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return {
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type: 'stylesheet',
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stylesheet: {
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source: options.source,
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rules: rulesList,
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parsingErrors: errorsList,
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},
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};
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}
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/**
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* Opening brace.
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*/
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function open() {
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return match(/^{\s*/);
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}
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/**
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* Closing brace.
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*/
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function close() {
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return match(/^}/);
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}
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/**
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* Parse ruleset.
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*/
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function rules() {
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let node: Rule | void;
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const rules: Rule[] = [];
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whitespace();
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comments(rules);
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while (css.length && css.charAt(0) !== '}' && (node = atrule() || rule())) {
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if (node !== false) {
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rules.push(node);
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comments(rules);
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}
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}
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return rules;
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}
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/**
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* Match `re` and return captures.
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*/
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function match(re: RegExp) {
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const m = re.exec(css);
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if (!m) {
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return;
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}
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const str = m[0];
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updatePosition(str);
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css = css.slice(str.length);
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return m;
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}
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/**
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* Parse whitespace.
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*/
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function whitespace() {
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match(/^\s*/);
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}
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/**
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* Parse comments;
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*/
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function comments(rules: Rule[] = []) {
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let c: Comment | void;
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while ((c = comment())) {
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if (c !== false) {
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rules.push(c);
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}
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c = comment();
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}
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return rules;
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}
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/**
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* Parse comment.
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*/
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function comment() {
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const pos = position();
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if ('/' !== css.charAt(0) || '*' !== css.charAt(1)) {
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return;
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}
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let i = 2;
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while (
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'' !== css.charAt(i) &&
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('*' !== css.charAt(i) || '/' !== css.charAt(i + 1))
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) {
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++i;
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}
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i += 2;
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if ('' === css.charAt(i - 1)) {
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return error('End of comment missing');
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}
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const str = css.slice(2, i - 2);
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column += 2;
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updatePosition(str);
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css = css.slice(i);
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column += 2;
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return pos({
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type: 'comment',
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comment: str,
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});
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}
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/**
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* Parse selector.
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*/
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function selector() {
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const m = match(/^([^{]+)/);
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if (!m) {
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return;
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}
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/* @fix Remove all comments from selectors
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* http://ostermiller.org/findcomment.html */
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return trim(m[0])
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.replace(/\/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*\/+/g, '')
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.replace(/"(?:\\"|[^"])*"|'(?:\\'|[^'])*'/g, m => {
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return m.replace(/,/g, '\u200C');
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})
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.split(/\s*(?![^(]*\)),\s*/)
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.map(s => {
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return s.replace(/\u200C/g, ',');
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});
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}
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/**
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* Parse declaration.
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*/
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function declaration(): Declaration | void | never {
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const pos = position();
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// prop
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let propMatch = match(/^(\*?[-#\/\*\\\w]+(\[[0-9a-z_-]+\])?)\s*/);
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if (!propMatch) {
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return;
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}
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const prop = trim(propMatch[0]);
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// :
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if (!match(/^:\s*/)) {
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return error(`property missing ':'`);
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}
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// val
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const val = match(/^((?:'(?:\\'|.)*?'|"(?:\\"|.)*?"|\([^\)]*?\)|[^};])+)/);
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const ret = pos({
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type: 'declaration',
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property: prop.replace(commentre, ''),
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value: val ? trim(val[0]).replace(commentre, '') : '',
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});
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// ;
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match(/^[;\s]*/);
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return ret;
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}
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/**
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* Parse declarations.
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*/
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function declarations() {
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const decls: Array<object> = [];
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if (!open()) {
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return error(`missing '{'`);
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}
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comments(decls);
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// declarations
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let decl;
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while ((decl = declaration())) {
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if ((decl as unknown) !== false) {
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decls.push(decl);
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comments(decls);
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}
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decl = declaration();
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}
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if (!close()) {
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return error(`missing '}'`);
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}
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return decls;
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}
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/**
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* Parse keyframe.
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*/
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function keyframe() {
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let m;
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const vals = [];
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const pos = position();
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while ((m = match(/^((\d+\.\d+|\.\d+|\d+)%?|[a-z]+)\s*/))) {
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vals.push(m[1]);
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match(/^,\s*/);
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}
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if (!vals.length) {
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return;
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}
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return pos({
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type: 'keyframe',
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values: vals,
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declarations: declarations() as Declaration[],
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});
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}
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/**
|
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* Parse keyframes.
|
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*/
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function atkeyframes() {
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const pos = position();
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let m = match(/^@([-\w]+)?keyframes\s*/);
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|
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if (!m) {
|
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return;
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}
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const vendor = m[1];
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|
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// identifier
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m = match(/^([-\w]+)\s*/);
|
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if (!m) {
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return error('@keyframes missing name');
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}
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const name = m[1];
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|
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if (!open()) {
|
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return error(`@keyframes missing '{'`);
|
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}
|
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|
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let frame;
|
||||
let frames = comments();
|
||||
while ((frame = keyframe())) {
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frames.push(frame);
|
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frames = frames.concat(comments());
|
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}
|
||||
|
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if (!close()) {
|
||||
return error(`@keyframes missing '}'`);
|
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}
|
||||
|
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return pos({
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type: 'keyframes',
|
||||
name,
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vendor,
|
||||
keyframes: frames,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse supports.
|
||||
*/
|
||||
|
||||
function atsupports() {
|
||||
const pos = position();
|
||||
const m = match(/^@supports *([^{]+)/);
|
||||
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
const supports = trim(m[1]);
|
||||
|
||||
if (!open()) {
|
||||
return error(`@supports missing '{'`);
|
||||
}
|
||||
|
||||
const style = comments().concat(rules());
|
||||
|
||||
if (!close()) {
|
||||
return error(`@supports missing '}'`);
|
||||
}
|
||||
|
||||
return pos({
|
||||
type: 'supports',
|
||||
supports,
|
||||
rules: style,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse host.
|
||||
*/
|
||||
|
||||
function athost() {
|
||||
const pos = position();
|
||||
const m = match(/^@host\s*/);
|
||||
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (!open()) {
|
||||
return error(`@host missing '{'`);
|
||||
}
|
||||
|
||||
const style = comments().concat(rules());
|
||||
|
||||
if (!close()) {
|
||||
return error(`@host missing '}'`);
|
||||
}
|
||||
|
||||
return pos({
|
||||
type: 'host',
|
||||
rules: style,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse media.
|
||||
*/
|
||||
|
||||
function atmedia() {
|
||||
const pos = position();
|
||||
const m = match(/^@media *([^{]+)/);
|
||||
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
const media = trim(m[1]);
|
||||
|
||||
if (!open()) {
|
||||
return error(`@media missing '{'`);
|
||||
}
|
||||
|
||||
const style = comments().concat(rules());
|
||||
|
||||
if (!close()) {
|
||||
return error(`@media missing '}'`);
|
||||
}
|
||||
|
||||
return pos({
|
||||
type: 'media',
|
||||
media,
|
||||
rules: style,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse custom-media.
|
||||
*/
|
||||
|
||||
function atcustommedia() {
|
||||
const pos = position();
|
||||
const m = match(/^@custom-media\s+(--[^\s]+)\s*([^{;]+);/);
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
|
||||
return pos({
|
||||
type: 'custom-media',
|
||||
name: trim(m[1]),
|
||||
media: trim(m[2]),
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse paged media.
|
||||
*/
|
||||
|
||||
function atpage() {
|
||||
const pos = position();
|
||||
const m = match(/^@page */);
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
|
||||
const sel = selector() || [];
|
||||
|
||||
if (!open()) {
|
||||
return error(`@page missing '{'`);
|
||||
}
|
||||
let decls = comments();
|
||||
|
||||
// declarations
|
||||
let decl;
|
||||
while ((decl = declaration())) {
|
||||
decls.push(decl);
|
||||
decls = decls.concat(comments());
|
||||
}
|
||||
|
||||
if (!close()) {
|
||||
return error(`@page missing '}'`);
|
||||
}
|
||||
|
||||
return pos({
|
||||
type: 'page',
|
||||
selectors: sel,
|
||||
declarations: decls,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse document.
|
||||
*/
|
||||
|
||||
function atdocument() {
|
||||
const pos = position();
|
||||
const m = match(/^@([-\w]+)?document *([^{]+)/);
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
|
||||
const vendor = trim(m[1]);
|
||||
const doc = trim(m[2]);
|
||||
|
||||
if (!open()) {
|
||||
return error(`@document missing '{'`);
|
||||
}
|
||||
|
||||
const style = comments().concat(rules());
|
||||
|
||||
if (!close()) {
|
||||
return error(`@document missing '}'`);
|
||||
}
|
||||
|
||||
return pos({
|
||||
type: 'document',
|
||||
document: doc,
|
||||
vendor,
|
||||
rules: style,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse font-face.
|
||||
*/
|
||||
|
||||
function atfontface() {
|
||||
const pos = position();
|
||||
const m = match(/^@font-face\s*/);
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (!open()) {
|
||||
return error(`@font-face missing '{'`);
|
||||
}
|
||||
let decls = comments();
|
||||
|
||||
// declarations
|
||||
let decl;
|
||||
while ((decl = declaration())) {
|
||||
decls.push(decl);
|
||||
decls = decls.concat(comments());
|
||||
}
|
||||
|
||||
if (!close()) {
|
||||
return error(`@font-face missing '}'`);
|
||||
}
|
||||
|
||||
return pos({
|
||||
type: 'font-face',
|
||||
declarations: decls,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse import
|
||||
*/
|
||||
|
||||
const atimport = _compileAtrule('import');
|
||||
|
||||
/**
|
||||
* Parse charset
|
||||
*/
|
||||
|
||||
const atcharset = _compileAtrule('charset');
|
||||
|
||||
/**
|
||||
* Parse namespace
|
||||
*/
|
||||
|
||||
const atnamespace = _compileAtrule('namespace');
|
||||
|
||||
/**
|
||||
* Parse non-block at-rules
|
||||
*/
|
||||
|
||||
function _compileAtrule(name: string) {
|
||||
const re = new RegExp('^@' + name + '\\s*([^;]+);');
|
||||
return () => {
|
||||
const pos = position();
|
||||
const m = match(re);
|
||||
if (!m) {
|
||||
return;
|
||||
}
|
||||
const ret: Record<string, string> = { type: name };
|
||||
ret[name] = m[1].trim();
|
||||
return pos(ret);
|
||||
};
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse at rule.
|
||||
*/
|
||||
|
||||
function atrule() {
|
||||
if (css[0] !== '@') {
|
||||
return;
|
||||
}
|
||||
|
||||
return (
|
||||
atkeyframes() ||
|
||||
atmedia() ||
|
||||
atcustommedia() ||
|
||||
atsupports() ||
|
||||
atimport() ||
|
||||
atcharset() ||
|
||||
atnamespace() ||
|
||||
atdocument() ||
|
||||
atpage() ||
|
||||
athost() ||
|
||||
atfontface()
|
||||
);
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse rule.
|
||||
*/
|
||||
|
||||
function rule() {
|
||||
const pos = position();
|
||||
const sel = selector();
|
||||
|
||||
if (!sel) {
|
||||
return error('selector missing');
|
||||
}
|
||||
comments();
|
||||
|
||||
return pos({
|
||||
type: 'rule',
|
||||
selectors: sel,
|
||||
declarations: declarations() as Declaration[],
|
||||
});
|
||||
}
|
||||
|
||||
return addParent(stylesheet());
|
||||
}
|
||||
|
||||
/**
|
||||
* Trim `str`.
|
||||
*/
|
||||
|
||||
function trim(str: string) {
|
||||
return str ? str.replace(/^\s+|\s+$/g, '') : '';
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds non-enumerable parent node reference to each node.
|
||||
*/
|
||||
|
||||
function addParent(obj: Stylesheet, parent?: Stylesheet) {
|
||||
const isNode = obj && typeof obj.type === 'string';
|
||||
const childParent = isNode ? obj : parent;
|
||||
|
||||
for (const k of Object.keys(obj)) {
|
||||
const value = obj[k as keyof Stylesheet];
|
||||
if (Array.isArray(value)) {
|
||||
value.forEach(v => {
|
||||
addParent(v, childParent);
|
||||
});
|
||||
} else if (value && typeof value === 'object') {
|
||||
addParent((value as unknown) as Stylesheet, childParent);
|
||||
}
|
||||
}
|
||||
|
||||
if (isNode) {
|
||||
Object.defineProperty(obj, 'parent', {
|
||||
configurable: true,
|
||||
writable: true,
|
||||
enumerable: false,
|
||||
value: parent || null,
|
||||
});
|
||||
}
|
||||
|
||||
return obj;
|
||||
}
|
||||
Reference in New Issue
Block a user