Nested Syntax Highlighting (#160)

data/plugins/language_html.lua

@@ -0,0 +1,36 @@
+-- lite-xl 1.16
+local syntax = require "core.syntax"
+
+syntax.add {
+  files = { "%.html?$" },
+  patterns = {
+    { 
+      pattern = { "<script type=['\"]%a+/javascript['\"]>", "</script>" },
+      syntax = ".js", 
+      type = "function" 
+    },
+    { 
+      pattern = { "<script>", "</script>" },
+      syntax = ".js",
+      type = "function"
+    },
+    { 
+      pattern = { "<style[^>]*>", "</style>" },
+      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 = {},
+}

data/plugins/language_xml.lua

@@ -2,7 +2,7 @@
 local syntax = require "core.syntax"
 
 syntax.add {
-  files = { "%.xml$", "%.html?$" },
+  files = { "%.xml$" },
   headers = "<%?xml",
   patterns = {
     { pattern = { "<!%-%-", "%-%->" },     type = "comment"  },