kludgey-ejs-vscode-tmlanguage.json

{
	"$schema": "https://raw.githubusercontent.com/Septh/tmlanguage/master/tmLanguage.schema.json",
	"name": "Embedded Javascript",
	"scopeName": "text.html.ejs",
	"injectionSelector": "L:text.html",
	"injections": {
		"text.html.ejs - (meta.embedded.block.ejs | meta.embedded.line.ejs | meta.tag | comment), L:meta.tag, L:source.js.embedded.html": {
			"patterns": [
				{
					"begin": "(^\\s*)(?=<%+#(?![^%]*%>))",
					"beginCaptures": {
						"0": {
							"name": "punctuation.whitespace.comment.leading.ejs"
						}
					},
					"end": "(?!\\G)(\\s*$\\n)?",
					"endCaptures": {
						"0": {
							"name": "punctuation.whitespace.comment.trailing.ejs"
						}
					},
					"patterns": [
						{
							"include": "#comment"
						}
					]
				},
				{
					"begin": "(^\\s*)(?=<%(?![^%]*%>))",
					"beginCaptures": {
						"0": {
							"name": "punctuation.whitespace.embedded.leading.ejs"
						}
					},
					"end": "(?!\\G)(\\s*$\\n)?",
					"endCaptures": {
						"0": {
							"name": "punctuation.whitespace.embedded.trailing.ejs"
						}
					},
					"patterns": [
						{
							"include":"#tag-ejs-single-line"
						},
						{
							"include":"#tag-ejs-multi-line"
						}
					]
				},
				{
					"include": "#tag-block-comment"
				},
				{
					"include": "#tag-single-line-section-comment"
				},
				{
					"include":"#tag-section-comment"
				},
				{
					"include":"#tag-ejs-single-line"
				},
				{
					"include":"#tag-ejs-multi-line"
				}
			]
		},
		"meta.block.js - (comment.block, text.html.ejs.override-js)": {
			"patterns": [
				{
					"begin": "\\G[_-]?([%?])(>)",
					"beginCaptures": {
						"0": {
							"name": "punctuation.definition.tag.end.ejs"
						},
						"1": {
							"name": "text.html.ejs.override-js"
						}
					},
					"end": "(<)(%|\\?)(?![%#])[_=-]?",
					"endCaptures": {
						"0": {
							"name": "punctuation.definition.tag.begin.ejs"
						},
						"1": {
							"name": "text.html.ejs.override-js"
						}
					},
					"contentName": "text.html.ejs.override-js",
					"patterns": [
						{
							"include": "text.html.ejs"
						}
					]
				}
			]
		}
	},
	"patterns": [
		{
			"include": "#tag-block-comment"
		},
		{
			"include": "#tag-single-line-section-comment"
		},
		{
			"include":"#tag-section-comment"
		},
		{
			"include":"#tag-ejs-single-line"
		},
		{
			"include":"#tag-ejs-multi-line"
		},
	],
	"repository": {
		"tag-block-comment": {
			"begin": "<[%?]#",
			"beginCaptures": {
				"0": {
					"name": "punctuation.definition.comment.ejs"
				}
			},
			"end": "[%?]>",
			"endCaptures": {
				"0": {
					"name": "punctuation.definition.comment.ejs"
				}
			},
			"name": "comment.block.ejs"
		},
		"tag-single-line-section-comment": {
			"begin": "(<[%?](?:(?!php))[%_=-]?)\\s*((\/\\*)(.*)(\\*\/))(?=(\\s*([%?]>)))",
			"captures": {
				"1": {
					"name": "punctuation.section.embedded.begin.ejs"
				},
				"3": {
					"name": "punctuation.definition.comment.ejs"
				},
				"5": {
					"name": "punctuation.definition.comment.ejs"
				},
				"2": {
					"name": "comment.block.ejs"
				}
			},
			"end": "([%?]>)",
			"endCaptures": {
				"1": {
					"name": "punctuation.section.embedded.end.ejs"
				}
			},
			"contentName": "comment.block.ejs",
			"name":"meta.block.single.comment.ejs"
		},
		"tag-section-comment": {
			"name":"comment.block.ejs",
			"begin":"(<[%?](?:(?!php)))\\s*((?=(\/\\*)))",
			"beginCaptures": {
				"1": {
					"name": "punctuation.section.embedded.begin.ejs"
				}
			},
			"end": "(\\*\/)\\s*([%?]>)",
			"endCaptures": {
				"1": {
					"name": "punctuation.definition.comment.ejs"
				},
				"2": {
					"name": "punctuation.section.embedded.end.ejs"
				}
			},
			"patterns":[
				{
					"name":"ejs-end-tag",
					"match":"([%?]>)",
					"captures":{
						"1":{
							"name":"punctuation.section.embedded.end.ejs"
						}
					}
				},
				{
					"name":"ejs-begin-tag",
					"match":"(<[%?](?:(?!php)))",
					"captures":{
						"1":{
							"name":"punctuation.section.embedded.begin.ejs"
						}
					}
				},
				{
					"include":"text.html.ejs"
				}
			]
		},		
		"tag-ejs-single-line": {
			"name": "meta.tag.metadata.script.ejs",
			"begin":"(<[%?](?:(?!php))[%_=-]?)(?!(\\s*\\*\/))(((?!([_-]?[%?]>)).)+)(?=([_-]?[%?]>))",
			"beginCaptures": {
				"0": {
					"contentName":"source.js",
					"name": "meta.embedded.*"
				},
				"1": {
					"name": "punctuation.section.embedded.begin.ejs"
				},
				"3": {
					"name": "meta.embedded.ejs",
					"contentName": "source.js",
					"patterns":[
						{
							"include":"source.js"
						}
					]
				},
				"6": {
					"name": "keyword.operator.relational.js"
				}
			},
			"end": "(([_-]?[%?]>))",
			"endCaptures": {
				"1": {
					"name": "punctuation.section.embedded.end.ejs"
				}
			}
		},
		"tag-ejs-multi-line": {
			"contentName":"source.js",
			"name": "meta.embedded.block.ejs",
			"begin":"(<[%?](?:(?!php))[%_=-]?)(?!([^%]*?[_-]?[%?]>))",
			"beginCaptures": {
				"1": {
					"name": "punctuation.section.embedded.begin.ejs"
				},
				"3": {
					"name": "meta.embedded.ejs",
					"contentName": "source.js",
					"patterns":[
						{
							"include":"source.js"
						}
					]
				}
			},
			"end": "(([_-]?[%?]>))",
			"endCaptures": {
				"1": {
					"name": "punctuation.section.embedded.end.ejs"
				}
			},
			"patterns":[
				{
					"name": "meta.embedded.ejs.override-js",
					"match": "(.(?![_-]?[%?]>))+",
					"captures": {
						"0": {
							"patterns": [{
								"include": "source.js"
							}]
						}
					}
				}, {
					"include": "source.js"
				}
			]
		}
	}
}

package.json
contributions.grammars:

{
	"language": "ejs",
	"scopeName": "text.html.ejs",
	"path": "./syntaxes/ejs.json",
	"embeddedLanguages": {
		"meta.embedded.block.ejs": "ejs",
		"meta.embedded.block.javascript": "source.js"
	}
}