Grammar Injection doesn't not work on multi-line content

From @zh4ui on October 29, 2017 13:8

I tried to inject TOML grammar into markdown, however the TOML colorizer only works on the first line (i.e. a = “b” in the image), it doesn’t work on the following line (i.e. d = “c” in the image)

My tmLanguage.json for the injection is like:

{
	"fileTypes": [],
	"injectionSelector": "text.html.markdown",
	"name": "tomlfrontmatter",
	"patterns": [
		{
			"begin": "\\Abegin\\s*",
			"end": "(^|\\G)end\\s*$",
				
				"patterns": [
					{
						"include": "source.toml"
					}
				]
		}
	],
	"scopeName": "toml.frontmatter.markdown"
}

The complete source code is at: https://github.com/zh4ui/vscode-markdowntoml.git

• VSCode Version: Version 1.17.2 (1.17.2)
• OS Version: macOS 10.13 (17A405)

Steps to Reproduce:

1. install the Better TOML for TOML colorizer
2. git clone https://github.com/zh4ui/vscode-markdowntoml.git
3. cd vscode-markdowntoml && code .
4. F5 to debug the code
5. Create a markdown file in the [Extension Development Host]
6. type in the content

begin a = "b"
c = "d"
end

Reproduces without extensions: No

Copied from original issue: Microsoft/vscode#37098

[zh4ui]

Okay. Writing a TextMate Grammar: Some Lessons Learned gives a fairly good explanation about “begin…end” and “begin…while”.

I am wondering is there a plan for vscode-textmate to support “begin…while”?

[zh4ui]

@colinfang

Yes, markdown-it only deals with markdown preview. So I gave up trying.

I’ve got an impression that currently grammar injection is just a hack, rather than a useable feature.