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fenceparser
Advanced tools
A well-tested parser for parsing metadata out of fenced code blocks in Markdown
A tiny, well-tested parser for parsing metadata out of fenced code blocks in Markdown.
Assuming you have this code fence in your Markdown,
```ts twoslash {1-3, 5} title="Hello, World"
Using remark will yield two information about that code block, lang
and meta
like this.
{
"lang": "ts",
"meta": "twoslash {1-3, 5} title=\"Hello, World\""
}
Use fenceparser
to parse the meta
string out to a useful object.
import parse from 'fenceparser'
console.log(parse(meta))
// {
// twoslash: true,
// highlight: { '1-3': true, '5': true },
// title: 'Hello, World'
// }
The parser won't intentionally handle parsing the language part since it is usually handled by the Markdown parsers.
But if you want to allow loose syntax grammars such as ts{1-3, 5}
as well as ts {1-3, 5}
which is used by gatsby-remark-vscode as an example, remark won't parse the language correctly.
{
"lang": "ts{1-3,", // because remark uses space to split
"meta": "5}"
}
In these cases, you can use the the library's lex
function to get a properly tokenized array. You may then take out the first element as lang
. For example,
import {lex, parse} from 'fenceparser'
// Notice this ^ parse is not the same the default export function
const full = [node.lang, node.meta].join(' ') // Join them back
const tokens = lex(full)
const lang = tokens.shift() // ts
const meta = parse(tokens) // { highlight: {'1-3': true, '5': true} }
The syntax grammar is loosely based on techniques used by various syntax-highlighters. Rules are such that
attribute
, data-attribute
, etc.true
attr=--theme-color
:
keyword, {1-3, 5, ids: {7}}
{1-3} {7}
are merged and assigned to the highlight
objectFAQs
A well-tested parser for parsing metadata out of fenced code blocks in Markdown
We found that fenceparser demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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