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101 lines
2.9 KiB
JavaScript
101 lines
2.9 KiB
JavaScript
"use strict";
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const assert = require("assert");
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const types = require("@babel/types");
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const template = require("@babel/template").default;
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const unpackExpression = require("./_unpack-expression");
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const NoChange = require("../astformer/actions/no-change");
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// FIXME: Add expression parens!
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let tmplCallLazy = template(`
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%%wrapper%%()
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`);
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let tmplLazyWrapper = template(`(
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() => %%expression%%
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)`);
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let tmplLazyWrapperRecursive = template(`(
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function() { return %%expression%%; }
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)`);
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let tmplExtend = template(`(
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$$jsNix$extend(this ?? {}, %%object%%)
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)`);
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function lazyEvaluationWrapper(args) {
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let { recursive, ... rest } = args;
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let wrapper = (recursive)
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? tmplLazyWrapperRecursive
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: tmplLazyWrapper;
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return unpackExpression(wrapper(rest));
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}
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function isDynamicBinding(binding) {
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return binding.attrpath.attr[0].type !== "NixAttributeIdentifier";
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}
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module.exports = {
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name: "attribute-sets",
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visitors: {
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Program: (_node, { setContext }) => {
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setContext(null, "attributeSets_inRecursiveSet", false);
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return NoChange;
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},
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NixAttributeSelection: (_node, { defer }) => {
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// TODO: Optimize dynamic attribute access by translating builtins.getAttr to dynamic property access at compile time? This requires scope analysis!
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return defer((node) => {
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assert(node.attrpath.type === "NixAttributePath");
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return node.attrpath.attr.reduce((last, identifier) => {
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assert(identifier.type === "NixAttributeIdentifier");
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return unpackExpression(tmplCallLazy({
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wrapper: types.memberExpression(last, types.identifier(identifier.name))
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}));
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}, node.expression);
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});
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},
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NixAttributeSet: (node, { defer, setContext, getContext }) => {
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if (node.recursive) {
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setContext(null, "attributeSets_inRecursiveSet", true);
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}
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return defer((node) => {
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let isRecursive = node.recursive;
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let hasDynamicBindings = node.bind.some((binding) => isDynamicBinding(binding));
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if (hasDynamicBindings) {
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throw new Error(`UNIMPLEMENTED: Dynamic bindings are not supported yet`);
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} else {
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let object = types.objectExpression(node.bind.map((binding) => {
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assert(binding.attrpath.attr.length === 1); // Nested attributes should have been desugared by this point
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let name = binding.attrpath.attr[0].name;
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let expression = binding.expression;
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return types.objectProperty(
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types.stringLiteral(name),
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lazyEvaluationWrapper({ recursive: isRecursive, expression: expression })
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);
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}));
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// FIXME/MARKER: This is currently broken!
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console.log({context: getContext("attributeSets_inRecursiveSet")});
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// Only do prototypal inheritance for `this` if we're dealing with nested recursive attribute sets
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if (isRecursive && getContext("attributeSets_inRecursiveSet") === true) {
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return unpackExpression(tmplExtend({
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object: object
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}));
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} else {
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return object;
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}
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}
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});
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},
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}
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};
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