name : cst-stringify.js /** * Stringify a CST document, token, or collection item * * Fair warning: This applies no validation whatsoever, and * simply concatenates the sources in their logical order. */ const stringify = (cst) => 'type' in cst ? stringifyToken(cst) : stringifyItem(cst); function stringifyToken(token) { switch (token.type) { case 'block-scalar': { let res = ''; for (const tok of token.props) res += stringifyToken(tok); return res + token.source; } case 'block-map': case 'block-seq': { let res = ''; for (const item of token.items) res += stringifyItem(item); return res; } case 'flow-collection': { let res = token.start.source; for (const item of token.items) res += stringifyItem(item); for (const st of token.end) res += st.source; return res; } case 'document': { let res = stringifyItem(token); if (token.end) for (const st of token.end) res += st.source; return res; } default: { let res = token.source; if ('end' in token && token.end) for (const st of token.end) res += st.source; return res; } } } function stringifyItem({ start, key, sep, value }) { let res = ''; for (const st of start) res += st.source; if (key) res += stringifyToken(key); if (sep) for (const st of sep) res += st.source; if (value) res += stringifyToken(value); return res; } export { stringify };