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stringify.js
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Wed, Mar 5, 06:02

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

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