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127 lines
4.4 KiB
JavaScript
127 lines
4.4 KiB
JavaScript
import { SelectorType, AttributeAction } from "./types";
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const attribValChars = ["\\", '"'];
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const pseudoValChars = [...attribValChars, "(", ")"];
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const charsToEscapeInAttributeValue = new Set(attribValChars.map((c) => c.charCodeAt(0)));
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const charsToEscapeInPseudoValue = new Set(pseudoValChars.map((c) => c.charCodeAt(0)));
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const charsToEscapeInName = new Set([
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...pseudoValChars,
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"~",
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"^",
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"$",
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"*",
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"+",
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"!",
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"|",
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":",
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"[",
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"]",
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" ",
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".",
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].map((c) => c.charCodeAt(0)));
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/**
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* Turns `selector` back into a string.
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*
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* @param selector Selector to stringify.
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*/
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export function stringify(selector) {
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return selector
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.map((token) => token.map(stringifyToken).join(""))
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.join(", ");
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}
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function stringifyToken(token, index, arr) {
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switch (token.type) {
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// Simple types
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case SelectorType.Child:
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return index === 0 ? "> " : " > ";
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case SelectorType.Parent:
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return index === 0 ? "< " : " < ";
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case SelectorType.Sibling:
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return index === 0 ? "~ " : " ~ ";
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case SelectorType.Adjacent:
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return index === 0 ? "+ " : " + ";
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case SelectorType.Descendant:
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return " ";
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case SelectorType.ColumnCombinator:
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return index === 0 ? "|| " : " || ";
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case SelectorType.Universal:
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// Return an empty string if the selector isn't needed.
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return token.namespace === "*" &&
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index + 1 < arr.length &&
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"name" in arr[index + 1]
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? ""
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: `${getNamespace(token.namespace)}*`;
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case SelectorType.Tag:
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return getNamespacedName(token);
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case SelectorType.PseudoElement:
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return `::${escapeName(token.name, charsToEscapeInName)}${token.data === null
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? ""
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: `(${escapeName(token.data, charsToEscapeInPseudoValue)})`}`;
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case SelectorType.Pseudo:
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return `:${escapeName(token.name, charsToEscapeInName)}${token.data === null
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? ""
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: `(${typeof token.data === "string"
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? escapeName(token.data, charsToEscapeInPseudoValue)
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: stringify(token.data)})`}`;
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case SelectorType.Attribute: {
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if (token.name === "id" &&
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token.action === AttributeAction.Equals &&
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token.ignoreCase === "quirks" &&
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!token.namespace) {
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return `#${escapeName(token.value, charsToEscapeInName)}`;
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}
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if (token.name === "class" &&
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token.action === AttributeAction.Element &&
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token.ignoreCase === "quirks" &&
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!token.namespace) {
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return `.${escapeName(token.value, charsToEscapeInName)}`;
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}
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const name = getNamespacedName(token);
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if (token.action === AttributeAction.Exists) {
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return `[${name}]`;
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}
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return `[${name}${getActionValue(token.action)}="${escapeName(token.value, charsToEscapeInAttributeValue)}"${token.ignoreCase === null ? "" : token.ignoreCase ? " i" : " s"}]`;
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}
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}
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}
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function getActionValue(action) {
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switch (action) {
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case AttributeAction.Equals:
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return "";
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case AttributeAction.Element:
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return "~";
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case AttributeAction.Start:
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return "^";
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case AttributeAction.End:
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return "$";
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case AttributeAction.Any:
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return "*";
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case AttributeAction.Not:
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return "!";
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case AttributeAction.Hyphen:
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return "|";
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case AttributeAction.Exists:
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throw new Error("Shouldn't be here");
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}
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}
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function getNamespacedName(token) {
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return `${getNamespace(token.namespace)}${escapeName(token.name, charsToEscapeInName)}`;
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}
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function getNamespace(namespace) {
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return namespace !== null
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? `${namespace === "*"
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? "*"
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: escapeName(namespace, charsToEscapeInName)}|`
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: "";
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}
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function escapeName(str, charsToEscape) {
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let lastIdx = 0;
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let ret = "";
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for (let i = 0; i < str.length; i++) {
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if (charsToEscape.has(str.charCodeAt(i))) {
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ret += `${str.slice(lastIdx, i)}\\${str.charAt(i)}`;
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lastIdx = i + 1;
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}
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}
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return ret.length > 0 ? ret + str.slice(lastIdx) : str;
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}
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