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a196a714b8
Co-authored-by: Andrew Eisenberg <aeisenberg@github.com> Co-authored-by: Henry Mercer <henrymercer@github.com>
57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.MaybeOutput = exports.ConditionalOutput = void 0;
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const Node_1 = require("./Node");
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/**
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* Helps output conditional helper methods.
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*
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* The `ConditionalOutput` concept is split into a usage site and a declaration
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* site, i.e. declaring a `function someHelper() { ... }`, and calling it
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* like `someHelper()`.
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*
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* While generating code, you can make usage says by using `someHelper` as
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* a placeholder, and then output the declaration with `someHelper.ifUsed`
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* to output the declaration conditionally only if `someHelper` has been
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* seen in the tree.
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*
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* ```typescript
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* const someHelper = conditionalOutput(
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* "someHelper",
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* code`function someHelper() { return 1 } `
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* );
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*
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* const code = code`
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* ${someHelper}
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*
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* ${someHelper.ifUsed}
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* `
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* ```
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*/
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class ConditionalOutput extends Node_1.Node {
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// A given ConditionalOutput const could be used in multiple code
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// parents, and so we don't want to use instance state to store
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// "should I be output or not", b/c it depends on the containing tree.
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constructor(usageSiteName, declarationSiteCode) {
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super();
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this.usageSiteName = usageSiteName;
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this.declarationSiteCode = declarationSiteCode;
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}
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get childNodes() {
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return [this.declarationSiteCode];
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}
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toCodeString() {
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return this.usageSiteName;
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}
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get ifUsed() {
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return new MaybeOutput(this, this.declarationSiteCode);
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}
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}
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exports.ConditionalOutput = ConditionalOutput;
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class MaybeOutput {
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constructor(parent, code) {
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this.parent = parent;
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this.code = code;
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}
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}
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exports.MaybeOutput = MaybeOutput;
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