57 lines
2.8 KiB
TypeScript
57 lines
2.8 KiB
TypeScript
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import {Prec} from "@codemirror/state"
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import {KeyBinding, keymap} from "@codemirror/view"
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import {Language, LanguageSupport, LanguageDescription} from "@codemirror/language"
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import {MarkdownExtension, MarkdownParser, parseCode} from "@lezer/markdown"
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import {html} from "@codemirror/lang-html"
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import {commonmarkLanguage, markdownLanguage, mkLang, getCodeParser} from "./markdown"
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import {insertNewlineContinueMarkup, deleteMarkupBackward} from "./commands"
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export {commonmarkLanguage, markdownLanguage, insertNewlineContinueMarkup, deleteMarkupBackward}
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/// A small keymap with Markdown-specific bindings. Binds Enter to
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/// [`insertNewlineContinueMarkup`](#lang-markdown.insertNewlineContinueMarkup)
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/// and Backspace to
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/// [`deleteMarkupBackward`](#lang-markdown.deleteMarkupBackward).
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export const markdownKeymap: readonly KeyBinding[] = [
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{key: "Enter", run: insertNewlineContinueMarkup},
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{key: "Backspace", run: deleteMarkupBackward}
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]
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const htmlNoMatch = html({matchClosingTags: false})
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/// Markdown language support.
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export function markdown(config: {
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/// When given, this language will be used by default to parse code
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/// blocks.
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defaultCodeLanguage?: Language | LanguageSupport,
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/// A collection of language descriptions to search through for a
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/// matching language (with
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/// [`LanguageDescription.matchLanguageName`](#language.LanguageDescription^matchLanguageName))
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/// when a fenced code block has an info string.
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codeLanguages?: readonly LanguageDescription[],
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/// Set this to false to disable installation of the Markdown
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/// [keymap](#lang-markdown.markdownKeymap).
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addKeymap?: boolean,
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/// Markdown parser
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/// [extensions](https://github.com/lezer-parser/markdown#user-content-markdownextension)
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/// to add to the parser.
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extensions?: MarkdownExtension,
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/// The base language to use. Defaults to
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/// [`commonmarkLanguage`](#lang-markdown.commonmarkLanguage).
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base?: Language
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} = {}) {
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let {codeLanguages, defaultCodeLanguage, addKeymap = true, base: {parser} = commonmarkLanguage} = config
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if (!(parser instanceof MarkdownParser)) throw new RangeError("Base parser provided to `markdown` should be a Markdown parser")
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let extensions = config.extensions ? [config.extensions] : []
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let support = [htmlNoMatch.support], defaultCode
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if (defaultCodeLanguage instanceof LanguageSupport) {
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support.push(defaultCodeLanguage.support)
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defaultCode = defaultCodeLanguage.language
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} else if (defaultCodeLanguage) {
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defaultCode = defaultCodeLanguage
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}
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let codeParser = codeLanguages || defaultCode ? getCodeParser(codeLanguages || [], defaultCode) : undefined
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extensions.push(parseCode({codeParser, htmlParser: htmlNoMatch.language.parser}))
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if (addKeymap) support.push(Prec.high(keymap.of(markdownKeymap)))
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return new LanguageSupport(mkLang(parser.configure(extensions)), support)
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}
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