Embedded JavaScript templating syntax support (#363)

* Embedded JavaScript templating syntax support

language_ejs.lua file, fork of language_html.lua to support .ejs files.

* Update README.md

* Update manifest.json

* Update manifest.json

* Pattern for ejs tags <%%>

`<%%>` now uses javascript syntax without any problems.

* Update language_ejs.lua

function instead of operator (i was testing something and uploaded without saving :)

* Update language_ejs.lua

3 files changed, 61 insertions, 0 deletions

diff --git a/README.md b/README.md
index 4db0b19..b42d339 100644
--- a/README.md
+++ b/README.md
@@ -267,6 +267,7 @@ but only with a `url` must provide a `checksum` that matches the existing plugin
 | [`language_wren`](plugins/language_wren.lua?raw=1)                                                               | Syntax for the [Wren](http://wren.io/) programming language                                                                                                                         |
 | [`language_yaml`](plugins/language_yaml.lua?raw=1)                                                               | Syntax for [YAML](https://yaml.org/) serialization language                                                                                                                         |
 | [`language_zig`](plugins/language_zig.lua?raw=1)                                                                 | Syntax for the [Zig](https://ziglang.org/) programming language                                                                                                                     |
+| [`language_ejs`](plugins/language_ejs.lua?raw=1)                                                                 | Syntax for the [EJS](https://ejs.co/)  javascript template engine                                                                                                                     |
 
 ## Libraries
 
diff --git a/manifest.json b/manifest.json
index 2d6762d..e06c513 100644
--- a/manifest.json
+++ b/manifest.json
@@ -84,6 +84,7 @@
         "language_dart": {},
         "language_diff": {},
         "language_edp": {},
+        "language_ejs": {},
         "language_elixir": {},
         "language_elm": {},
         "language_env": {},
@@ -699,6 +700,14 @@
       "tags": ["language"]
     },
     {
+      "description": "Syntax for the [EJS](https://ejs.co/) javascript template engine",
+      "version": "0.1",
+      "path": "plugins/language_ejs.lua",
+      "id": "language_ejs",
+      "mod_version": "3",
+      "tags": ["language"]
+    },
+    {
       "description": "Syntax for the [Elixir](https://elixir-lang.org) programming language",
       "version": "0.2",
       "path": "plugins/language_elixir.lua",
diff --git a/plugins/language_ejs.lua b/plugins/language_ejs.lua
new file mode 100644
index 0000000..f303bad
--- /dev/null
+++ b/plugins/language_ejs.lua
@@ -0,0 +1,51 @@
+-- mod-version:3
+
+-- Embedded JavaScript templating
+-- provides .ejs syntax support (fork of language_html.lua).
+
+local syntax = require "core.syntax"
+
+syntax.add {
+  name = "EJS",
+  files = { "%.ejs$" },
+  block_comment = { "<!--", "-->" },
+  patterns = {
+    {
+      pattern = {
+        "<%%",
+        "%%>"
+      },
+      syntax = '.js',
+      type = "function"
+    },
+    {
+      pattern = {
+        "<%s*[sS][cC][rR][iI][pP][tT]%f[%s>].->",
+        "<%s*/%s*[sS][cC][rR][iI][pP][tT]%s*>"
+      },
+      syntax = ".js",
+      type = "function"
+    },
+    {
+      pattern = {
+        "<%s*[sS][tT][yY][lL][eE]%f[%s>].->",
+        "<%s*/%s*[sS][tT][yY][lL][eE]%s*>"
+      },
+      syntax = ".css",
+      type = "function"
+    },
+    { pattern = { "<!%-%-", "%-%->" },     type = "comment"  },
+    { pattern = { '%f[^>][^<]', '%f[<]' }, type = "normal"   },
+    { pattern = { '"', '"', '\\' },        type = "string"   },
+    { pattern = { "'", "'", '\\' },        type = "string"   },
+    { pattern = "0x[%da-fA-F]+",           type = "number"   },
+    { pattern = "-?%d+[%d%.]*f?",          type = "number"   },
+    { pattern = "-?%.?%d+f?",              type = "number"   },
+    { pattern = "%f[^<]![%a_][%w_]*",      type = "keyword2" },
+    { pattern = "%f[^<][%a_][%w_]*",       type = "function" },
+    { pattern = "%f[^<]/[%a_][%w_]*",      type = "function" },
+    { pattern = "[%a_][%w_]*",             type = "keyword"  },
+    { pattern = "[/<>=]",                  type = "operator" },
+  },
+  symbols = {},
+}