Initial Commit

grammar.js

@@ -0,0 +1,54 @@
+/// <reference types="tree-sitter-cli/dsl" />
+// @ts-check
+
+module.exports = grammar({
+  name: "dotenv",
+
+  extras: $ => [
+    /\s/
+  ],
+
+  externals: $ => [
+    $._empty_value,
+  ],
+
+  rules: {
+    document: $ => repeat(choice(
+      $.comment,
+      $.assignment,
+    )),
+
+    assignment: $ => seq(
+      field("key", $.identifier),
+      "=",
+      field("value", $._value),
+    ),
+
+    comment: _ => seq('#', /.*/),
+
+    identifier: _ => token(/[A-Za-z_][A-Za-z0-9_]*/),
+
+    _value: $ => choice(
+      $.string,
+      $.string_interpolation,
+      $.value,
+      alias($._empty_value, $.value),
+    ),
+
+    string: $ => seq(
+      "'",
+      $.string_content,
+      "'",
+    ),
+
+    string_interpolation: $ => seq(
+      '"',
+      alias($.string_interpolation_content, $.string_content),
+      '"',
+    ),
+
+    string_content: _ => token(/[^']*/),
+    string_interpolation_content: _ => token(/[^"]*/),
+    value: _ => token(prec(-1, /[^\#\=\s]+/)),
+  },
+});