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Pull Request Pull Request #692: feat(parse): Support legacy pseudo-elements

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98.1

/src/parse.ts

import {
    Selector,
    SelectorType,
    AttributeSelector,
    Traversal,
    AttributeAction,
    TraversalType,
    DataType,
} from "./types";

const reName = /^[^\\#]?(?:\\(?:[\da-f]{1,6}\s?|.)|[\w\-\u00b0-\uFFFF])+/;
const reEscape = /\\([\da-f]{1,6}\s?|(\s)|.)/gi;

const enum CharCode {
    LeftParenthesis = 40,
    RightParenthesis = 41,
    LeftSquareBracket = 91,
    RightSquareBracket = 93,
    Comma = 44,
    Period = 46,
    Colon = 58,
    SingleQuote = 39,
    DoubleQuote = 34,
    Plus = 43,
    Tilde = 126,
    QuestionMark = 63,
    ExclamationMark = 33,
    Slash = 47,
    Star = 42,
    Equal = 61,
    Dollar = 36,
    Pipe = 124,
    Circumflex = 94,
    Asterisk = 42,
    GreaterThan = 62,
    LessThan = 60,
    Hash = 35,
    LowerI = 105,
    LowerS = 115,
    BackSlash = 92,

    // Whitespace
    Space = 32,
    Tab = 9,
    NewLine = 10,
    FormFeed = 12,
    CarriageReturn = 13,
}

const actionTypes = new Map<number, AttributeAction>([
    [CharCode.Tilde, AttributeAction.Element],
    [CharCode.Circumflex, AttributeAction.Start],
    [CharCode.Dollar, AttributeAction.End],
    [CharCode.Asterisk, AttributeAction.Any],
    [CharCode.ExclamationMark, AttributeAction.Not],
    [CharCode.Pipe, AttributeAction.Hyphen],
]);

// Pseudos, whose data property is parsed as well.
const unpackPseudos = new Set([
    "has",
    "not",
    "matches",
    "is",
    "where",
    "host",
    "host-context",
]);

/**
 * Pseudo elements defined in CSS Level 1 and CSS Level 2 can be written with
 * a single colon; eg. :before will turn into ::before.
 *
 * @see {@link https://www.w3.org/TR/2018/WD-selectors-4-20181121/#pseudo-element-syntax}
 */
const pseudosToPseudoElements = new Set([
    "before",
    "after",
    "first-line",
    "first-letter",
]);

/**
 * Checks whether a specific selector is a traversal.
 * This is useful eg. in swapping the order of elements that
 * are not traversals.
 *
 * @param selector Selector to check.
 */
export function isTraversal(selector: Selector): selector is Traversal {
    switch (selector.type) {
        case SelectorType.Adjacent:
        case SelectorType.Child:
        case SelectorType.Descendant:
        case SelectorType.Parent:
        case SelectorType.Sibling:
        case SelectorType.ColumnCombinator:
            return true;
        default:
            return false;
    }
}

const stripQuotesFromPseudos = new Set(["contains", "icontains"]);

// Unescape function taken from https://github.com/jquery/sizzle/blob/master/src/sizzle.js#L152
function funescape(_: string, escaped: string, escapedWhitespace?: string) {
    const high = parseInt(escaped, 16) - 0x10000;

    // NaN means non-codepoint
    return high !== high || escapedWhitespace
        ? escaped
        : high < 0
        ? // BMP codepoint
          String.fromCharCode(high + 0x10000)
        : // Supplemental Plane codepoint (surrogate pair)
          String.fromCharCode((high >> 10) | 0xd800, (high & 0x3ff) | 0xdc00);
}

function unescapeCSS(str: string) {
    return str.replace(reEscape, funescape);
}

function isQuote(c: number): boolean {
    return c === CharCode.SingleQuote || c === CharCode.DoubleQuote;
}

function isWhitespace(c: number): boolean {
    return (
        c === CharCode.Space ||
        c === CharCode.Tab ||
        c === CharCode.NewLine ||
        c === CharCode.FormFeed ||
        c === CharCode.CarriageReturn
    );
}

/**
 * Parses `selector`, optionally with the passed `options`.
 *
 * @param selector Selector to parse.
 * @param options Options for parsing.
 * @returns Returns a two-dimensional array.
 * The first dimension represents selectors separated by commas (eg. `sub1, sub2`),
 * the second contains the relevant tokens for that selector.
 */
export function parse(selector: string): Selector[][] {
    const subselects: Selector[][] = [];

    const endIndex = parseSelector(subselects, `${selector}`, 0);

    if (endIndex < selector.length) {
        throw new Error(`Unmatched selector: ${selector.slice(endIndex)}`);
    }

    return subselects;
}

function parseSelector(
    subselects: Selector[][],
    selector: string,
    selectorIndex: number
): number {
    let tokens: Selector[] = [];

    function getName(offset: number): string {
        const match = selector.slice(selectorIndex + offset).match(reName);

        if (!match) {
            throw new Error(
                `Expected name, found ${selector.slice(selectorIndex)}`
            );
        }

        const [name] = match;
        selectorIndex += offset + name.length;
        return unescapeCSS(name);
    }

    function stripWhitespace(offset: number) {
        selectorIndex += offset;

        while (
            selectorIndex < selector.length &&
            isWhitespace(selector.charCodeAt(selectorIndex))
        ) {
            selectorIndex++;
        }
    }

    function isEscaped(pos: number): boolean {
        let slashCount = 0;

        while (selector.charCodeAt(--pos) === CharCode.BackSlash) slashCount++;
        return (slashCount & 1) === 1;
    }

    function ensureNotTraversal() {
        if (tokens.length > 0 && isTraversal(tokens[tokens.length - 1])) {
            throw new Error("Did not expect successive traversals.");
        }
    }

    function addTraversal(type: TraversalType) {
        if (
            tokens.length > 0 &&
            tokens[tokens.length - 1].type === SelectorType.Descendant
        ) {
            tokens[tokens.length - 1].type = type;
            return;
        }

        ensureNotTraversal();

        tokens.push({ type });
    }

    function addSpecialAttribute(name: string, action: AttributeAction) {
        tokens.push({
            type: SelectorType.Attribute,
            name,
            action,
            value: getName(1),
            namespace: null,
            ignoreCase: "quirks",
        });
    }

    /**
     * We have finished parsing the current part of the selector.
     *
     * Remove descendant tokens at the end if they exist,
     * and return the last index, so that parsing can be
     * picked up from here.
     */
    function finalizeSubselector() {
        if (
            tokens.length &&
            tokens[tokens.length - 1].type === SelectorType.Descendant
        ) {
            tokens.pop();
        }

        if (tokens.length === 0) {
            throw new Error("Empty sub-selector");
        }

        subselects.push(tokens);
    }

    stripWhitespace(0);

    if (selector.length === selectorIndex) {
        return selectorIndex;
    }

    loop: while (selectorIndex < selector.length) {
        const firstChar = selector.charCodeAt(selectorIndex);

        switch (firstChar) {
            // Whitespace
            case CharCode.Space:
            case CharCode.Tab:
            case CharCode.NewLine:
            case CharCode.FormFeed:
            case CharCode.CarriageReturn: {
                if (
                    tokens.length === 0 ||
                    tokens[0].type !== SelectorType.Descendant
                ) {
                    ensureNotTraversal();
                    tokens.push({ type: SelectorType.Descendant });
                }

                stripWhitespace(1);
                break;
            }
            // Traversals
            case CharCode.GreaterThan: {
                addTraversal(SelectorType.Child);
                stripWhitespace(1);
                break;
            }
            case CharCode.LessThan: {
                addTraversal(SelectorType.Parent);
                stripWhitespace(1);
                break;
            }
            case CharCode.Tilde: {
                addTraversal(SelectorType.Sibling);
                stripWhitespace(1);
                break;
            }
            case CharCode.Plus: {
                addTraversal(SelectorType.Adjacent);
                stripWhitespace(1);
                break;
            }
            // Special attribute selectors: .class, #id
            case CharCode.Period: {
                addSpecialAttribute("class", AttributeAction.Element);
                break;
            }
            case CharCode.Hash: {
                addSpecialAttribute("id", AttributeAction.Equals);
                break;
            }
            case CharCode.LeftSquareBracket: {
                stripWhitespace(1);

                // Determine attribute name and namespace

                let name: string;
                let namespace: string | null = null;

                if (selector.charCodeAt(selectorIndex) === CharCode.Pipe) {
                    // Equivalent to no namespace
                    name = getName(1);
                } else if (selector.startsWith("*|", selectorIndex)) {
                    namespace = "*";
                    name = getName(2);
                } else {
                    name = getName(0);

                    if (
                        selector.charCodeAt(selectorIndex) === CharCode.Pipe &&
                        selector.charCodeAt(selectorIndex + 1) !==
                            CharCode.Equal
                    ) {
                        namespace = name;
                        name = getName(1);
                    }
                }

                stripWhitespace(0);

                // Determine comparison operation

                let action: AttributeAction = AttributeAction.Exists;
                const possibleAction = actionTypes.get(
                    selector.charCodeAt(selectorIndex)
                );

                if (possibleAction) {
                    action = possibleAction;

                    if (
                        selector.charCodeAt(selectorIndex + 1) !==
                        CharCode.Equal
                    ) {
                        throw new Error("Expected `=`");
                    }

                    stripWhitespace(2);
                } else if (
                    selector.charCodeAt(selectorIndex) === CharCode.Equal
                ) {
                    action = AttributeAction.Equals;
                    stripWhitespace(1);
                }

                // Determine value

                let value = "";
                let ignoreCase: boolean | null = null;

                if (action !== "exists") {
                    if (isQuote(selector.charCodeAt(selectorIndex))) {
                        const quote = selector.charCodeAt(selectorIndex);
                        let sectionEnd = selectorIndex + 1;
                        while (
                            sectionEnd < selector.length &&
                            (selector.charCodeAt(sectionEnd) !== quote ||
                                isEscaped(sectionEnd))
                        ) {
                            sectionEnd += 1;
                        }

                        if (selector.charCodeAt(sectionEnd) !== quote) {
                            throw new Error("Attribute value didn't end");
                        }

                        value = unescapeCSS(
                            selector.slice(selectorIndex + 1, sectionEnd)
                        );
                        selectorIndex = sectionEnd + 1;
                    } else {
                        const valueStart = selectorIndex;

                        while (
                            selectorIndex < selector.length &&
                            ((!isWhitespace(
                                selector.charCodeAt(selectorIndex)
                            ) &&
                                selector.charCodeAt(selectorIndex) !==
                                    CharCode.RightSquareBracket) ||
                                isEscaped(selectorIndex))
                        ) {
                            selectorIndex += 1;
                        }

                        value = unescapeCSS(
                            selector.slice(valueStart, selectorIndex)
                        );
                    }

                    stripWhitespace(0);

                    // See if we have a force ignore flag

                    const forceIgnore =
                        selector.charCodeAt(selectorIndex) | 0x20;

                    // If the forceIgnore flag is set (either `i` or `s`), use that value
                    if (forceIgnore === CharCode.LowerS) {
                        ignoreCase = false;
                        stripWhitespace(1);
                    } else if (forceIgnore === CharCode.LowerI) {
                        ignoreCase = true;
                        stripWhitespace(1);
                    }
                }

                if (
                    selector.charCodeAt(selectorIndex) !==
                    CharCode.RightSquareBracket
                ) {
                    throw new Error("Attribute selector didn't terminate");
                }

                selectorIndex += 1;

                const attributeSelector: AttributeSelector = {
                    type: SelectorType.Attribute,
                    name,
                    action,
                    value,
                    namespace,
                    ignoreCase,
                };

                tokens.push(attributeSelector);
                break;
            }
            case CharCode.Colon: {
                if (selector.charCodeAt(selectorIndex + 1) === CharCode.Colon) {
                    tokens.push({
                        type: SelectorType.PseudoElement,
                        name: getName(2).toLowerCase(),
                    });
                    break;
                }

                const name = getName(1).toLowerCase();

                if (pseudosToPseudoElements.has(name)) {
                    tokens.push({
                        type: SelectorType.PseudoElement,
                        name,
                    });
                    break;
                }

                let data: DataType = null;

                if (
                    selector.charCodeAt(selectorIndex) ===
                    CharCode.LeftParenthesis
                ) {
                    if (unpackPseudos.has(name)) {
                        if (isQuote(selector.charCodeAt(selectorIndex + 1))) {
                            throw new Error(
                                `Pseudo-selector ${name} cannot be quoted`
                            );
                        }

                        data = [];
                        selectorIndex = parseSelector(
                            data,
                            selector,
                            selectorIndex + 1
                        );

                        if (
                            selector.charCodeAt(selectorIndex) !==
                            CharCode.RightParenthesis
                        ) {
                            throw new Error(
                                `Missing closing parenthesis in :${name} (${selector})`
                            );
                        }

                        selectorIndex += 1;
                    } else {
                        selectorIndex += 1;
                        const start = selectorIndex;
                        let counter = 1;

                        for (
                            ;
                            counter > 0 && selectorIndex < selector.length;
                            selectorIndex++
                        ) {
                            if (
                                selector.charCodeAt(selectorIndex) ===
                                    CharCode.LeftParenthesis &&
                                !isEscaped(selectorIndex)
                            ) {
                                counter++;
                            } else if (
                                selector.charCodeAt(selectorIndex) ===
                                    CharCode.RightParenthesis &&
                                !isEscaped(selectorIndex)
                            ) {
                                counter--;
                            }
                        }

                        if (counter) {
                            throw new Error("Parenthesis not matched");
                        }

                        data = selector.slice(start, selectorIndex - 1);

                        if (stripQuotesFromPseudos.has(name)) {
                            const quot = data.charCodeAt(0);

                            if (
                                quot === data.charCodeAt(data.length - 1) &&
                                isQuote(quot)
                            ) {
                                data = data.slice(1, -1);
                            }
                        }

                        data = unescapeCSS(data);
                    }
                }

                tokens.push({ type: SelectorType.Pseudo, name, data });
                break;
            }
            case CharCode.Comma: {
                finalizeSubselector();
                tokens = [];
                stripWhitespace(1);
                break;
            }
            default: {
                if (selector.startsWith("/*", selectorIndex)) {
                    const endIndex = selector.indexOf("*/", selectorIndex + 2);

                    if (endIndex < 0) {
                        throw new Error("Comment was not terminated");
                    }

                    selectorIndex = endIndex + 2;

                    // Remove leading whitespace
                    if (tokens.length === 0) {
                        stripWhitespace(0);
                    }

                    break;
                }

                let namespace = null;
                let name: string;

                if (firstChar === CharCode.Asterisk) {
                    selectorIndex += 1;
                    name = "*";
                } else if (firstChar === CharCode.Pipe) {
                    name = "";

                    if (
                        selector.charCodeAt(selectorIndex + 1) === CharCode.Pipe
                    ) {
                        addTraversal(SelectorType.ColumnCombinator);
                        stripWhitespace(2);
                        break;
                    }
                } else if (reName.test(selector.slice(selectorIndex))) {
                    name = getName(0);
                } else {
                    break loop;
                }

                if (
                    selector.charCodeAt(selectorIndex) === CharCode.Pipe &&
                    selector.charCodeAt(selectorIndex + 1) !== CharCode.Pipe
                ) {
                    namespace = name;
                    if (
                        selector.charCodeAt(selectorIndex + 1) ===
                        CharCode.Asterisk
                    ) {
                        name = "*";
                        selectorIndex += 2;
                    } else {
                        name = getName(1);
                    }
                }

                tokens.push(
                    name === "*"
                        ? { type: SelectorType.Universal, namespace }
                        : { type: SelectorType.Tag, name, namespace }
                );
            }
        }
    }

    finalizeSubselector();
    return selectorIndex;
}

1	import {	3✔
2	Selector,
3	SelectorType,
4	AttributeSelector,
5	Traversal,
6	AttributeAction,
7	TraversalType,
8	DataType,
9	} from "./types";
10
11	const reName = /^[^\\#]?(?:\\(?:[\da-f]{1,6}\s?\|.)\|[\w\-\u00b0-\uFFFF])+/;	3✔
12	const reEscape = /\\([\da-f]{1,6}\s?\|(\s)\|.)/gi;	3✔
13
14	const enum CharCode {
15	LeftParenthesis = 40,
16	RightParenthesis = 41,
17	LeftSquareBracket = 91,
18	RightSquareBracket = 93,
19	Comma = 44,
20	Period = 46,
21	Colon = 58,
22	SingleQuote = 39,
23	DoubleQuote = 34,
24	Plus = 43,
25	Tilde = 126,
26	QuestionMark = 63,
27	ExclamationMark = 33,
28	Slash = 47,
29	Star = 42,
30	Equal = 61,
31	Dollar = 36,
32	Pipe = 124,
33	Circumflex = 94,
34	Asterisk = 42,
35	GreaterThan = 62,
36	LessThan = 60,
37	Hash = 35,
38	LowerI = 105,
39	LowerS = 115,
40	BackSlash = 92,
41
42	// Whitespace
43	Space = 32,
44	Tab = 9,
45	NewLine = 10,
46	FormFeed = 12,
47	CarriageReturn = 13,
48	}
49
50	const actionTypes = new Map<number, AttributeAction>([	3✔
51	[CharCode.Tilde, AttributeAction.Element],
52	[CharCode.Circumflex, AttributeAction.Start],
53	[CharCode.Dollar, AttributeAction.End],
54	[CharCode.Asterisk, AttributeAction.Any],
55	[CharCode.ExclamationMark, AttributeAction.Not],
56	[CharCode.Pipe, AttributeAction.Hyphen],
57	]);
58
59	// Pseudos, whose data property is parsed as well.
60	const unpackPseudos = new Set([	3✔
61	"has",
62	"not",
63	"matches",
64	"is",
65	"where",
66	"host",
67	"host-context",
68	]);
69
70	/**
71	* Pseudo elements defined in CSS Level 1 and CSS Level 2 can be written with
72	* a single colon; eg. :before will turn into ::before.
73	*
74	* @see {@link https://www.w3.org/TR/2018/WD-selectors-4-20181121/#pseudo-element-syntax}
75	*/
76	const pseudosToPseudoElements = new Set([	3✔
77	"before",
78	"after",
79	"first-line",
80	"first-letter",
81	]);
82
83	/**
84	* Checks whether a specific selector is a traversal.
85	* This is useful eg. in swapping the order of elements that
86	* are not traversals.
87	*
88	* @param selector Selector to check.
89	*/
90	export function isTraversal(selector: Selector): selector is Traversal {	3✔
91	switch (selector.type) {	1,130!
92	case SelectorType.Adjacent:
93	case SelectorType.Child:
94	case SelectorType.Descendant:
95	case SelectorType.Parent:
96	case SelectorType.Sibling:
97	case SelectorType.ColumnCombinator:
98	return true;	1✔
99	default:
100	return false;	1,129✔
101	}
102	}
103
104	const stripQuotesFromPseudos = new Set(["contains", "icontains"]);	3✔
105
106	// Unescape function taken from https://github.com/jquery/sizzle/blob/master/src/sizzle.js#L152
107	function funescape(_: string, escaped: string, escapedWhitespace?: string) {
108	const high = parseInt(escaped, 16) - 0x10000;	134✔
109
110	// NaN means non-codepoint
111	return high !== high \|\| escapedWhitespace	134✔
112	? escaped
113	: high < 0	10✔
114	? // BMP codepoint
115	String.fromCharCode(high + 0x10000)
116	: // Supplemental Plane codepoint (surrogate pair)
117	String.fromCharCode((high >> 10) \| 0xd800, (high & 0x3ff) \| 0xdc00);
118	}
119
120	function unescapeCSS(str: string) {
121	return str.replace(reEscape, funescape);	4,960✔
122	}
123
124	function isQuote(c: number): boolean {
125	return c === CharCode.SingleQuote \|\| c === CharCode.DoubleQuote;	732✔
126	}
127
128	function isWhitespace(c: number): boolean {
129	return (	6,557✔
130	c === CharCode.Space \|\|	30,859✔
131	c === CharCode.Tab \|\|
132	c === CharCode.NewLine \|\|
133	c === CharCode.FormFeed \|\|
134	c === CharCode.CarriageReturn
135	);
136	}
137
138	/**
139	* Parses `selector`, optionally with the passed `options`.
140	*
141	* @param selector Selector to parse.
142	* @param options Options for parsing.
143	* @returns Returns a two-dimensional array.
144	* The first dimension represents selectors separated by commas (eg. `sub1, sub2`),
145	* the second contains the relevant tokens for that selector.
146	*/
147	export function parse(selector: string): Selector[][] {	3✔
148	const subselects: Selector[][] = [];	1,791✔
149
150	const endIndex = parseSelector(subselects, `${selector}`, 0);	1,791✔
151
152	if (endIndex < selector.length) {	1,767✔
153	throw new Error(`Unmatched selector: ${selector.slice(endIndex)}`);	1✔
154	}
155
156	return subselects;	1,766✔
157	}
158
159	function parseSelector(
160	subselects: Selector[][],
161	selector: string,
162	selectorIndex: number
163	): number {
164	let tokens: Selector[] = [];	2,097✔
165
166	function getName(offset: number): string {
167	const match = selector.slice(selectorIndex + offset).match(reName);	4,209✔
168
169	if (!match) {	4,209✔
170	throw new Error(	4✔
171	`Expected name, found ${selector.slice(selectorIndex)}`
172	);
173	}
174
175	const [name] = match;	4,205✔
176	selectorIndex += offset + name.length;	4,205✔
177	return unescapeCSS(name);	4,205✔
178	}
179
180	function stripWhitespace(offset: number) {
181	selectorIndex += offset;	5,472✔
182
183	while (	5,472✔
184	selectorIndex < selector.length &&	11,888✔
185	isWhitespace(selector.charCodeAt(selectorIndex))
186	) {
187	selectorIndex++;	482✔
188	}
189	}
190
191	function isEscaped(pos: number): boolean {
192	let slashCount = 0;	802✔
193
194	while (selector.charCodeAt(--pos) === CharCode.BackSlash) slashCount++;	802✔
195	return (slashCount & 1) === 1;	802✔
196	}
197
198	function ensureNotTraversal() {
199	if (tokens.length > 0 && isTraversal(tokens[tokens.length - 1])) {	1,136✔
200	throw new Error("Did not expect successive traversals.");	1✔
201	}
202	}
203
204	function addTraversal(type: TraversalType) {
205	if (	363✔
206	tokens.length > 0 &&	720✔
207	tokens[tokens.length - 1].type === SelectorType.Descendant
208	) {
209	tokens[tokens.length - 1].type = type;	329✔
210	return;	329✔
211	}
212
213	ensureNotTraversal();	34✔
214
215	tokens.push({ type });	33✔
216	}
217
218	function addSpecialAttribute(name: string, action: AttributeAction) {
219	tokens.push({	1,396✔
220	type: SelectorType.Attribute,
221	name,
222	action,
223	value: getName(1),
224	namespace: null,
225	ignoreCase: "quirks",
226	});
227	}
228
229	/**
230	* We have finished parsing the current part of the selector.
231	*
232	* Remove descendant tokens at the end if they exist,
233	* and return the last index, so that parsing can be
234	* picked up from here.
235	*/
236	function finalizeSubselector() {
237	if (	2,207✔
238	tokens.length &&	4,404✔
239	tokens[tokens.length - 1].type === SelectorType.Descendant
240	) {
241	tokens.pop();	18✔
242	}
243
244	if (tokens.length === 0) {	2,207✔
245	throw new Error("Empty sub-selector");	10✔
246	}
247
248	subselects.push(tokens);	2,197✔
249	}
250
251	stripWhitespace(0);	2,097✔
252
253	if (selector.length === selectorIndex) {	2,097✔
254	return selectorIndex;	6✔
255	}
256
257	loop: while (selectorIndex < selector.length) {	2,091✔
258	const firstChar = selector.charCodeAt(selectorIndex);	6,259✔
259
260	switch (firstChar) {	6,259✔
261	// Whitespace
262	case CharCode.Space:
263	case CharCode.Tab:
264	case CharCode.NewLine:
265	case CharCode.FormFeed:
266	case CharCode.CarriageReturn: {
267	if (	1,102✔
268	tokens.length === 0 \|\|	2,204✔
269	tokens[0].type !== SelectorType.Descendant
270	) {
271	ensureNotTraversal();	1,102✔
272	tokens.push({ type: SelectorType.Descendant });	1,102✔
273	}
274
275	stripWhitespace(1);	1,102✔
276	break;	1,102✔
277	}
278	// Traversals
279	case CharCode.GreaterThan: {
280	addTraversal(SelectorType.Child);	198✔
281	stripWhitespace(1);	197✔
282	break;	197✔
283	}
284	case CharCode.LessThan: {
285	addTraversal(SelectorType.Parent);	7✔
286	stripWhitespace(1);	7✔
287	break;	7✔
288	}
289	case CharCode.Tilde: {
290	addTraversal(SelectorType.Sibling);	82✔
291	stripWhitespace(1);	82✔
292	break;	82✔
293	}
294	case CharCode.Plus: {
295	addTraversal(SelectorType.Adjacent);	72✔
296	stripWhitespace(1);	72✔
297	break;	72✔
298	}
299	// Special attribute selectors: .class, #id
300	case CharCode.Period: {
301	addSpecialAttribute("class", AttributeAction.Element);	460✔
302	break;	460✔
303	}
304	case CharCode.Hash: {
305	addSpecialAttribute("id", AttributeAction.Equals);	936✔
306	break;	934✔
307	}
308	case CharCode.LeftSquareBracket: {
309	stripWhitespace(1);	488✔
310
311	// Determine attribute name and namespace
312
313	let name: string;	488✔
314	let namespace: string \| null = null;	488✔
315
316	if (selector.charCodeAt(selectorIndex) === CharCode.Pipe) {	488✔
317	// Equivalent to no namespace
318	name = getName(1);	2✔
319	} else if (selector.startsWith("*\|", selectorIndex)) {	486✔
320	namespace = "*";	3✔
321	name = getName(2);	3✔
322	} else {
323	name = getName(0);	483✔
324
325	if (	482✔
326	selector.charCodeAt(selectorIndex) === CharCode.Pipe &&	494✔
327	selector.charCodeAt(selectorIndex + 1) !==
328	CharCode.Equal
329	) {
330	namespace = name;	5✔
331	name = getName(1);	5✔
332	}
333	}
334
335	stripWhitespace(0);	486✔
336
337	// Determine comparison operation
338
339	let action: AttributeAction = AttributeAction.Exists;	486✔
340	const possibleAction = actionTypes.get(	486✔
341	selector.charCodeAt(selectorIndex)
342	);
343
344	if (possibleAction) {	486✔
345	action = possibleAction;	153✔
346
347	if (	153✔
348	selector.charCodeAt(selectorIndex + 1) !==
349	CharCode.Equal
350	) {
351	throw new Error("Expected `=`");	1✔
352	}
353
354	stripWhitespace(2);	152✔
355	} else if (	333✔
356	selector.charCodeAt(selectorIndex) === CharCode.Equal
357	) {
358	action = AttributeAction.Equals;	244✔
359	stripWhitespace(1);	244✔
360	}
361
362	// Determine value
363
364	let value = "";	485✔
365	let ignoreCase: boolean \| null = null;	485✔
366
367	if (action !== "exists") {	485✔
368	if (isQuote(selector.charCodeAt(selectorIndex))) {	396✔
369	const quote = selector.charCodeAt(selectorIndex);	304✔
370	let sectionEnd = selectorIndex + 1;	304✔
371	while (	304✔
372	sectionEnd < selector.length &&	4,701✔
373	(selector.charCodeAt(sectionEnd) !== quote \|\|
374	isEscaped(sectionEnd))
375	) {
376	sectionEnd += 1;	1,894✔
377	}
378
379	if (selector.charCodeAt(sectionEnd) !== quote) {	304✔
380	throw new Error("Attribute value didn't end");	1✔
381	}
382
383	value = unescapeCSS(	303✔
384	selector.slice(selectorIndex + 1, sectionEnd)
385	);
386	selectorIndex = sectionEnd + 1;	303✔
387	} else {
388	const valueStart = selectorIndex;	92✔
389
390	while (	92✔
391	selectorIndex < selector.length &&	1,962✔
392	((!isWhitespace(
393	selector.charCodeAt(selectorIndex)
394	) &&
395	selector.charCodeAt(selectorIndex) !==
396	CharCode.RightSquareBracket) \|\|
397	isEscaped(selectorIndex))
398	) {
399	selectorIndex += 1;	532✔
400	}
401
402	value = unescapeCSS(	92✔
403	selector.slice(valueStart, selectorIndex)
404	);
405	}
406
407	stripWhitespace(0);	395✔
408
409	// See if we have a force ignore flag
410
411	const forceIgnore =
412	selector.charCodeAt(selectorIndex) \| 0x20;	395✔
413
414	// If the forceIgnore flag is set (either `i` or `s`), use that value
415	if (forceIgnore === CharCode.LowerS) {	395✔
416	ignoreCase = false;	2✔
417	stripWhitespace(1);	2✔
418	} else if (forceIgnore === CharCode.LowerI) {	393✔
419	ignoreCase = true;	8✔
420	stripWhitespace(1);	8✔
421	}
422	}
423
424	if (	484✔
425	selector.charCodeAt(selectorIndex) !==
426	CharCode.RightSquareBracket
427	) {
428	throw new Error("Attribute selector didn't terminate");	2✔
429	}
430
431	selectorIndex += 1;	482✔
432
433	const attributeSelector: AttributeSelector = {	482✔
434	type: SelectorType.Attribute,
435	name,
436	action,
437	value,
438	namespace,
439	ignoreCase,
440	};
441
442	tokens.push(attributeSelector);	482✔
443	break;	482✔
444	}
445	case CharCode.Colon: {
446	if (selector.charCodeAt(selectorIndex + 1) === CharCode.Colon) {	923✔
447	tokens.push({	2✔
448	type: SelectorType.PseudoElement,
449	name: getName(2).toLowerCase(),
450	});
451	break;	2✔
452	}
453
454	const name = getName(1).toLowerCase();	921✔
455
456	if (pseudosToPseudoElements.has(name)) {	921!
457	tokens.push({	×
458	type: SelectorType.PseudoElement,
459	name,
460	});
461	break;	×
462	}
463
464	let data: DataType = null;	921✔
465
466	if (	921✔
467	selector.charCodeAt(selectorIndex) ===
468	CharCode.LeftParenthesis
469	) {
470	if (unpackPseudos.has(name)) {	668✔
471	if (isQuote(selector.charCodeAt(selectorIndex + 1))) {	307✔
472	throw new Error(	1✔
473	`Pseudo-selector ${name} cannot be quoted`
474	);
475	}
476
477	data = [];	306✔
478	selectorIndex = parseSelector(	306✔
479	data,
480	selector,
481	selectorIndex + 1
482	);
483
484	if (	302✔
485	selector.charCodeAt(selectorIndex) !==
486	CharCode.RightParenthesis
487	) {
488	throw new Error(	1✔
489	`Missing closing parenthesis in :${name} (${selector})`
490	);
491	}
492
493	selectorIndex += 1;	301✔
494	} else {
495	selectorIndex += 1;	361✔
496	const start = selectorIndex;	361✔
497	let counter = 1;	361✔
498
499	for (	361✔
500	;
501	counter > 0 && selectorIndex < selector.length;	3,628✔
502	selectorIndex++
503	) {
504	if (	1,633✔
505	selector.charCodeAt(selectorIndex) ===	1,652✔
506	CharCode.LeftParenthesis &&
507	!isEscaped(selectorIndex)
508	) {
509	counter++;	10✔
510	} else if (	1,623✔
511	selector.charCodeAt(selectorIndex) ===	2,004✔
512	CharCode.RightParenthesis &&
513	!isEscaped(selectorIndex)
514	) {
515	counter--;	370✔
516	}
517	}
518
519	if (counter) {	361✔
520	throw new Error("Parenthesis not matched");	1✔
521	}
522
523	data = selector.slice(start, selectorIndex - 1);	360✔
524
525	if (stripQuotesFromPseudos.has(name)) {	360✔
526	const quot = data.charCodeAt(0);	80✔
527
528	if (	80✔
529	quot === data.charCodeAt(data.length - 1) &&	109✔
530	isQuote(quot)
531	) {
532	data = data.slice(1, -1);	11✔
533	}
534	}
535
536	data = unescapeCSS(data);	360✔
537	}
538	}
539
540	tokens.push({ type: SelectorType.Pseudo, name, data });	914✔
541	break;	914✔
542	}
543	case CharCode.Comma: {
544	finalizeSubselector();	136✔
545	tokens = [];	134✔
546	stripWhitespace(1);	134✔
547	break;	134✔
548	}
549	default: {
550	if (selector.startsWith("/*", selectorIndex)) {	1,855✔
551	const endIndex = selector.indexOf("*/", selectorIndex + 2);	5✔
552
553	if (endIndex < 0) {	5✔
554	throw new Error("Comment was not terminated");	2✔
555	}
556
557	selectorIndex = endIndex + 2;	3✔
558
559	// Remove leading whitespace
560	if (tokens.length === 0) {	3✔
561	stripWhitespace(0);	2✔
562	}
563
564	break;	3✔
565	}
566
567	let namespace = null;	1,850✔
568	let name: string;	1,850✔
569
570	if (firstChar === CharCode.Asterisk) {	1,850✔
571	selectorIndex += 1;	144✔
572	name = "*";	144✔
573	} else if (firstChar === CharCode.Pipe) {	1,706✔
574	name = "";	6✔
575
576	if (	6✔
577	selector.charCodeAt(selectorIndex + 1) === CharCode.Pipe
578	) {
579	addTraversal(SelectorType.ColumnCombinator);	4✔
580	stripWhitespace(2);	4✔
581	break;	4✔
582	}
583	} else if (reName.test(selector.slice(selectorIndex))) {	1,700✔
584	name = getName(0);	1,391✔
585	} else {
586	break loop;	309✔
587	}
588
589	if (	1,537✔
590	selector.charCodeAt(selectorIndex) === CharCode.Pipe &&	1,550✔
591	selector.charCodeAt(selectorIndex + 1) !== CharCode.Pipe
592	) {
593	namespace = name;	12✔
594	if (	12✔
595	selector.charCodeAt(selectorIndex + 1) ===
596	CharCode.Asterisk
597	) {
598	name = "*";	6✔
599	selectorIndex += 2;	6✔
600	} else {
601	name = getName(1);	6✔
602	}
603	}
604
605	tokens.push(	1,537✔
606	name === "*"	1,537✔
607	? { type: SelectorType.Universal, namespace }
608	: { type: SelectorType.Tag, name, namespace }
609	);
610	}
611	}
612	}
613
614	finalizeSubselector();	2,071✔
615	return selectorIndex;	2,063✔
616	}

fb55 / css-what / 1941538313

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