feat(package): hemar: tree sitter grammar

package/hemar/grammar/tree-sitter/grammar.js

@@ -0,0 +1,41 @@
+module.exports = grammar({
+  name: "mytempl",
+
+  rules: {
+    source_file: $ => repeat($.element),
+
+    element: $ => choice($.interpolation, $.segment, $.text),
+
+    interpolation: $ => seq("{[", $.path,  "]}"),
+
+    segment:         $ => seq($.for, repeat($.element), $.done),
+
+
+    for:   $ => seq("{[", "for", $.string, "in", $.path, "]}"),
+    done:     $ => seq("{[", "done", "]}"),
+    //include:         $ => seq("include", $.path),
+    //call:            $ => seq("call", $.string, "in", $.language),
+    //call_end:        $ => seq("end", $.string),
+    //standalone_call: $ => seq("call", $.string, "end"),
+    //language: $ => choice("dash", "plpgsql"),
+
+    path: $ => choice(
+      ".",
+      seq(
+        $.string,
+        repeat(seq(".", $.string)),
+      ),
+    ),
+
+    // anything but space
+    string: $ => choice(
+      // no whitespace, ], \, ., "
+      token(prec(-1, /[^] .\\"]+/)),
+    // " ... " with "" = escaped "
+      token(prec(-1, /"([^"]|"")*"/)),
+    ),
+
+    // anything but {[
+    text: $ => token(prec(-1, /(?:\{[^\[]|[^{])+/)),
+  }
+});