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import lodash from "@11ty/lodash-custom";
import debugUtil from "debug";
const { set: lodashSet } = lodash;
const debug = debugUtil("Eleventy:ComputedDataTemplateString");
/* Calculates computed data in Template Strings.
* Ideally we would use the Proxy approach but it doesn’t work
* in some template languages that visit all available data even if
* it isn’t used in the template (Nunjucks)
*/
class ComputedDataTemplateString {
constructor(computedKeys) {
if (Array.isArray(computedKeys)) {
this.computedKeys = new Set(computedKeys);
} else {
this.computedKeys = computedKeys;
}
// is this ¯\_(lisp)_/¯
// must be strings that won’t be escaped by template languages
this.prefix = "(((11ty(((";
this.suffix = ")))11ty)))";
}
getProxyData() {
let proxyData = {};
// use these special strings as a workaround to check the rendered output
// can’t use proxies here as some template languages trigger proxy for all
// keys in data
for (let key of this.computedKeys) {
// TODO don’t allow to set eleventyComputed.page? other disallowed computed things?
lodashSet(proxyData, key, this.prefix + key + this.suffix);
}
return proxyData;
}
findVarsInOutput(output = "") {
let vars = new Set();
let splits = output.split(this.prefix);
for (let split of splits) {
let varName = split.slice(0, split.indexOf(this.suffix) < 0 ? 0 : split.indexOf(this.suffix));
if (varName) {
vars.add(varName);
}
}
return Array.from(vars);
}
async findVarsUsed(fn) {
let proxyData = this.getProxyData();
let output;
// Mitigation for #1061, errors with filters in the first pass shouldn’t fail the whole thing.
try {
output = await fn(proxyData);
} catch (e) {
debug("Computed Data first pass data resolution error: %o", e);
}
// page.outputPath on serverless urls returns false.
if (typeof output === "string") {
return this.findVarsInOutput(output);
}
return [];
}
}
export default ComputedDataTemplateString;
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