astro
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Astro is a modern site builder with web best practices, performance, and DX front-of-mind.
48 lines (47 loc) • 1.6 kB
JavaScript
const splitAttrsTokenizer = /([${}@\w:\-]*)\s*=\s*?(['"]?)(.*?)\2\s+/g;
function replaceAttribute(s, node, key, newValue) {
splitAttrsTokenizer.lastIndex = 0;
const text = s.original.slice(node.position?.start.offset ?? 0, node.position?.end.offset ?? 0).toString();
const offset = text.indexOf(key);
if (offset === -1) return;
const start = node.position.start.offset + offset;
const tokens = text.slice(offset).split(splitAttrsTokenizer);
const token = tokens[0].replace(/([^>])>[\s\S]*$/gm, "$1");
if (token.trim() === key) {
const end = start + key.length;
return s.overwrite(start, end, newValue, { contentOnly: true });
} else {
const length = token.length;
const end = start + length;
return s.overwrite(start, end, newValue, { contentOnly: true });
}
}
const NEEDS_ESCAPE_RE = /[`\\]|\$\{/g;
function needsEscape(value) {
NEEDS_ESCAPE_RE.lastIndex = 0;
return typeof value === "string" && NEEDS_ESCAPE_RE.test(value);
}
function escapeTemplateLiteralCharacters(value) {
NEEDS_ESCAPE_RE.lastIndex = 0;
let char;
let startIndex = 0;
let segment = "";
let text = "";
while ([char] = NEEDS_ESCAPE_RE.exec(value) ?? []) {
if (!char) {
text += value.slice(startIndex);
break;
}
const endIndex = NEEDS_ESCAPE_RE.lastIndex - char.length;
const prefix = segment === "\\" ? "" : "\\";
segment = prefix + char;
text += value.slice(startIndex, endIndex) + segment;
startIndex = NEEDS_ESCAPE_RE.lastIndex;
}
return text;
}
export {
escapeTemplateLiteralCharacters,
needsEscape,
replaceAttribute
};