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