Add docs for lang spec
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670364e386
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1
public/js/alpine-3.14.0.min.js
vendored
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1
public/js/alpine-3.14.0.min.js
vendored
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@ -37,10 +37,10 @@ const { showSidebarButton = true } = Astro.props;
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How to guides
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</a>
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<a
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href="/reference/"
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href="/spec/"
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class="hidden lg:inline-block px-4 font-display font-bold-text-xl hover:underline"
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>
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Language reference
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Language spec
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</a>
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<a
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href="/api/std/"
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@ -36,6 +36,6 @@ const { title } = Astro.props;
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<body class="bg-c-bg text-c-text">
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<slot />
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<script src="//unpkg.com/alpinejs" defer></script>
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<script src="/js/alpine-3.14.0.min.js" defer></script>
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</body>
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</html>
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18
src/layouts/DocsLayout.astro
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18
src/layouts/DocsLayout.astro
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@ -0,0 +1,18 @@
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---
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import PagesLayout from "./PagesLayout.astro";
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const { frontmatter, headings } = Astro.props;
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const posts = await Astro.glob("../pages/learn/**/*.{md,mdx}");
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const indexSubpath = `/learn/index.mdx`;
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---
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<PagesLayout
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frontmatter={frontmatter}
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headings={headings}
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posts={posts}
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indexSubpath={indexSubpath}
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basePath="/learn/"
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>
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<slot />
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</PagesLayout>
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@ -4,12 +4,8 @@ import BaseLayout from "./BaseLayout.astro";
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import TOC from "../components/TOC.astro";
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import Sidebar from "../components/Sidebar.astro";
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const { frontmatter, headings } = Astro.props;
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const posts = await Astro.glob("../pages/learn/**/*.{md,mdx}");
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// The index.md page must have a `pagesLayout` frontmatter, which declares the order of all the pages.
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const indexSubpath = `/learn/index.mdx`;
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const { frontmatter, headings, posts: _posts, indexSubpath, basePath } = Astro.props;
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const posts: Record<string, any>[] = _posts;
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const indexPage = posts.find((post) => post.file.endsWith(indexSubpath));
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@ -66,7 +62,7 @@ function validateEntry(entry: PageEntry, basePath: string) {
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}
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for (const entry of pagesIndex) {
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validateEntry(entry, `/learn/`);
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validateEntry(entry, basePath);
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}
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---
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@ -82,7 +78,7 @@ for (const entry of pagesIndex) {
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<nav class="py-4 pr-2 overflow-x-scroll h-[calc(100vh-3rem)]">
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{
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pagesIndex.map((entry) => (
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<Sidebar entry={entry} basePath="/learn/" />
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<Sidebar entry={entry} basePath={basePath} />
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))
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}
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</nav>
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18
src/layouts/SpecLayout.astro
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src/layouts/SpecLayout.astro
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---
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import PagesLayout from "./PagesLayout.astro";
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const { frontmatter, headings } = Astro.props;
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const posts = await Astro.glob("../pages/spec/**/*.{md,mdx}");
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const indexSubpath = `/spec/index.md`;
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---
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<PagesLayout
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frontmatter={frontmatter}
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headings={headings}
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posts={posts}
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indexSubpath={indexSubpath}
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basePath="/spec/"
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>
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<slot />
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</PagesLayout>
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Comments
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Datatypes
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Hello world
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---
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import InteractiveCode from "../../../components/InteractiveCode.astro";
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Operators
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Variables
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Anonymous classes
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---
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# Anonymous classes
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Classes
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Interfaces
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Magic methods
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Static
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Arrays
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Enums
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Maps
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Tuples
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Nullable types
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---
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Try/Exceptions
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---
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import InteractiveCode from "../../../components/InteractiveCode.astro";
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Blocks
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Conditionals
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Loops
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Match
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Declaration
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Higher Order Functions
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Lambdas
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---
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@ -1,5 +1,5 @@
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---
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layout: ../../../layouts/PagesLayout.astro
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layout: ../../../layouts/DocsLayout.astro
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title: Function parameters
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---
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---
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layout: ../../layouts/PagesLayout.astro
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layout: ../../layouts/DocsLayout.astro
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title: Welcome
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pagesLayout:
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- path: index
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@ -1,5 +1,5 @@
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---
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layout: ../../layouts/PagesLayout.astro
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layout: ../../layouts/DocsLayout.astro
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title: Install
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---
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36
src/pages/spec/ast/ast.md
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36
src/pages/spec/ast/ast.md
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---
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layout: ../../../layouts/SpecLayout.astro
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title: AST
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---
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# THP AST
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Created during the syntax analysis phase, from the stream of
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tokens produced by the lexic analysis phase.
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## File and modules
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Every file has its own AST, and every file is a module.
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```ebnf
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AST = Module
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Module = (Statement | Expression)*
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```
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## Statement
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(At the moment) a statement is either a variable binding or a function declaration
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```ebnf
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Statement = VariableBinding
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| FunctionDeclaration
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```
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## Expression
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See the Expression section
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129
src/pages/spec/index.md
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129
src/pages/spec/index.md
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---
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layout: ../../layouts/SpecLayout.astro
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title: Welcome
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pagesLayout:
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- path: index
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- path: tokens
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title: Tokens
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children:
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- path: tokens
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- path: numbers
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- path: identifier
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- path: string
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- path: comments
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- path: operator
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- path: grouping
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- path: newline
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- path: ast
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title: THP AST
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children:
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- path: ast
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---
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# The THP Language Specification
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This series of pages define the THP Programming Language.
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THP's grammar is context-dependant.
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The syntax is specified using a weird mix of Extended Backus Naur Form
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and RegExp:
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```abnf
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; comments
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syntax = concatenation
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concatenation = alternation grouping
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alternation = "a" | "b"
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| "c"
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grouping = ("a", "b")
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optional = "a"?
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one_or_more = "a"+
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zero_or_more = "a"*
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range = "1".."9"
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literal = "a"
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```
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## Compiler architecture
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The compiler consists of 5 common phases:
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- **Lexical Analysis**: Transforms the source code into tokens
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- **Syntactic Analysis**: Parses the tokens and generates an AST
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- **Semantic Analysis**: Checks the AST structure and performs type checking
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- **IR**: Transforms the THP AST into a PHP AST
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- **Codegen**: Generates PHP source code from the PHP AST
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## Source Code representation
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Source code is encoded in UTF-8, and a single UTF-8 codepoint is
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a single character. As THP is implemented using the Rust programming
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language, rules around Rust's UTF-8 usage are followed.
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## Basic characters
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Although the source code must be encoded in UTF-8, most of the actual
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source code will use only the basic 128 ASCII characters. String contents may
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contain any Unicode code point.
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```abnf
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underscore = "_"
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decimal_digit = "0".."9"
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binary_digit = "0" | "1"
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octal_digit = "0".."7"
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hex_digit = decimal_digit | "a".."f" | "A".."F"
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lowercase_letter = "a".."z"
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uppercase_letter = "A".."Z"
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```
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## Whitespace
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THP is partially whitespace sensitive. It uses the following tokens: Indent, Dedent & NewLine
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to determine when an expression spans multiple lines.
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The lexer stores the indentation level of every line, and when scanning the next line,
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compares the previous indentation to the new one. If the amount of whitespace is
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greater than before, it emits a Indent token. If it's lower, emits a Dedent token, and
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if it's the same it does nothing.
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```thp
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1 + 2
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+ 3
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+ 4
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```
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The previous code would emit the following tokens: `1` `+` `2` `NewLine` `Indent` `+` `3` `NewLine`
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`+` `4` `Dedent`
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Additionaly, it is a lexical error to have wrong indentation. The lexer stores all
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previous indentation levels in a stack, and reports an error if a decrease in indentation
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doesn't match a previous level.
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```thp
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if true { // 0 indentation
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print() // 4 indentation
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print() // 2 indentation. Error. There is no 2-indentation level
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}
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```
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These tokens are used to detect when a expression is done, instead of relying on
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semicolons. This is performed by the parser.
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Every other production of the grammar doesn't care about whitespace/indentation, so
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those ignore whitespace.
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16
src/pages/spec/tokens/comments.md
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16
src/pages/spec/tokens/comments.md
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---
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layout: ../../../layouts/SpecLayout.astro
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title: Comment
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---
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# Comment
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```ebnf
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Comment = "//", any_except_new_line
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```
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```thp
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// This is a comment
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//
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// Another // comment
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```
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17
src/pages/spec/tokens/grouping.md
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17
src/pages/spec/tokens/grouping.md
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---
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layout: ../../../layouts/SpecLayout.astro
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title: Grouping signs
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---
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# Grouping signs
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Each grouping sign has its own token:
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```ebnf
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LeftParen = "("
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RightParen = ")"
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LeftBracket = "["
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RightBracket = "]"
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LeftBrace = "{"
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RightBrace = "}"
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```
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54
src/pages/spec/tokens/identifier.md
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54
src/pages/spec/tokens/identifier.md
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---
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layout: ../../../layouts/SpecLayout.astro
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title: Identifiers & Datatypes
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---
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# Identifiers & Datatypes
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Upper and lowercase letters carry different meaning when at the start of a word.
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A Datatype must always start with an uppercase letter, and an identifier must start
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with either a lowercase letter or an underscore.
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## Identifier
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```ebnf
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Identifier = (underscore | lowercase_letter), identifier_letter*
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identifier_letter = underscore | lowercase_letter | uppercase_letter | decimal_digit
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```
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```thp
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identifier
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_identifier
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_123
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_many_letters
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camelCase
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```
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## Datatype
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||||
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```ebnf
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Datatype = uppercase_letter, indentifier_letter*
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```
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```thp
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Datatype
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PDO
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WEIRD_DATATYPE
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```
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## Keywords
|
||||
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The following are (currently) THP keywords:
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||||
```thp
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val var fun
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```
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Keywords are scanned first as identifiers, then transformed
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to their respective tokens.
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15
src/pages/spec/tokens/newline.md
Normal file
15
src/pages/spec/tokens/newline.md
Normal file
@ -0,0 +1,15 @@
|
||||
---
|
||||
layout: ../../../layouts/SpecLayout.astro
|
||||
title: New line
|
||||
---
|
||||
|
||||
# New line
|
||||
|
||||
When there are multiple empty lines, only a single NewLine token
|
||||
is emitted.
|
||||
|
||||
```ebnf
|
||||
NewLine = "\n", empty_line*
|
||||
|
||||
empty_line = " "*, "\n"
|
||||
```
|
||||
56
src/pages/spec/tokens/numbers.md
Normal file
56
src/pages/spec/tokens/numbers.md
Normal file
@ -0,0 +1,56 @@
|
||||
---
|
||||
layout: ../../../layouts/SpecLayout.astro
|
||||
title: Numbers
|
||||
---
|
||||
|
||||
# Numbers
|
||||
|
||||
## Int
|
||||
|
||||
```ebnf
|
||||
Int = hexadecimal_number
|
||||
| decimal_number
|
||||
|
||||
hexadecimal_number = "0", ("x" | "X"), hexadecimal_digit+
|
||||
decimal_number = decimal_digit+
|
||||
```
|
||||
|
||||
```thp
|
||||
12345
|
||||
01234 // This is a decimal number, not an octal number
|
||||
0xff25
|
||||
0XFfaA
|
||||
```
|
||||
|
||||
`TODO`: Implement octal `0o777` and binary `0b0110`.
|
||||
|
||||
`TODO`: Allow underscores `_` between any number: `1_000_000`.
|
||||
|
||||
|
||||
## Float
|
||||
|
||||
```ebnf
|
||||
Float = decimal_number, ".", decimal_number+, scientific_notation?
|
||||
| decimal_number, scientific_notation
|
||||
|
||||
scientific_notation = "e", ("+" | "-"), decimal_number
|
||||
```
|
||||
|
||||
```thp
|
||||
123.456
|
||||
123.456e+4
|
||||
123.456e-2
|
||||
|
||||
123e+10
|
||||
123e-3
|
||||
```
|
||||
|
||||
|
||||
All floating point numbers must start with at least 1 digit.
|
||||
`.5` is not a valid floating point number.
|
||||
|
||||
|
||||
`TODO`: Allow scientific notation to omit the `+`/`-`: `10e4`.
|
||||
|
||||
|
||||
|
||||
30
src/pages/spec/tokens/operator.md
Normal file
30
src/pages/spec/tokens/operator.md
Normal file
@ -0,0 +1,30 @@
|
||||
---
|
||||
layout: ../../../layouts/SpecLayout.astro
|
||||
title: Operator
|
||||
---
|
||||
|
||||
# Operator
|
||||
|
||||
|
||||
```ebnf
|
||||
Operator = operator_char+
|
||||
|
||||
operator_char = "+" | "-" | "=" | "*" | "!" | "/" | "|"
|
||||
| "@" | "#" | "$" | "~" | "%" | "&" | "?"
|
||||
| "<" | ">" | "^" | "." | ":"
|
||||
```
|
||||
|
||||
```thp
|
||||
+ - / * % < > <= >= -> =>
|
||||
```
|
||||
|
||||
These are all the characters that can make an operator.
|
||||
|
||||
The lexer doesn't know about any operator in particular.
|
||||
In other languages something like `+-1` would be interpreted
|
||||
as `+` `-` `1`. In THP, this is always `+-` `1`, and that
|
||||
would throw an error because the operator `+-` doesn't exist.
|
||||
|
||||
## Comma
|
||||
|
||||
Comma is its own token: `,`.
|
||||
29
src/pages/spec/tokens/string.md
Normal file
29
src/pages/spec/tokens/string.md
Normal file
@ -0,0 +1,29 @@
|
||||
---
|
||||
layout: ../../../layouts/SpecLayout.astro
|
||||
title: String
|
||||
---
|
||||
|
||||
# String
|
||||
|
||||
A string is single line, delimited by double quotes `"` only.
|
||||
|
||||
```ebnf
|
||||
String = double_quote, (escape_seq | string_char)*, double_quote
|
||||
|
||||
double_quote = '"'
|
||||
escape_seq = "\n"
|
||||
| '\"'
|
||||
| "\r"
|
||||
| "\\"
|
||||
| "\t"
|
||||
string_char = any_unicode_except_newline_and_double_quote
|
||||
```
|
||||
|
||||
```thp
|
||||
"hello"
|
||||
""
|
||||
"it's me"
|
||||
"\"Mario\""
|
||||
```
|
||||
|
||||
`TODO`: String interpolation
|
||||
38
src/pages/spec/tokens/tokens.md
Normal file
38
src/pages/spec/tokens/tokens.md
Normal file
@ -0,0 +1,38 @@
|
||||
---
|
||||
layout: ../../../layouts/SpecLayout.astro
|
||||
title: Index
|
||||
---
|
||||
|
||||
# Tokens index
|
||||
|
||||
These are all the THP tokens:
|
||||
|
||||
```rust
|
||||
pub enum TokenType {
|
||||
Identifier,
|
||||
Datatype,
|
||||
Int,
|
||||
Float,
|
||||
String,
|
||||
Operator,
|
||||
LeftParen,
|
||||
RightParen,
|
||||
LeftBracket,
|
||||
RightBracket,
|
||||
LeftBrace,
|
||||
RightBrace,
|
||||
NewLine,
|
||||
Comment,
|
||||
Comma,
|
||||
INDENT,
|
||||
DEDENT,
|
||||
VAL,
|
||||
VAR,
|
||||
EOF,
|
||||
FUN,
|
||||
}
|
||||
```
|
||||
|
||||
Every keyword has its own token.
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user