1 files changed, 105 insertions, 0 deletions
diff --git a/grammar.js b/grammar.js
new file mode 100644
index 0000000..e74c27b
--- /dev/null
+++ b/grammar.js
@@ -0,0 +1,105 @@
+module.exports = grammar({
+  name: 'apinotation',
+
+  rules: {
+    source_file: $ => repeat(
+      seq(
+        choice(
+          $.definition,
+          $.comment
+        ),
+        repeat($._newline)
+      )
+    ),
+    definition: $ => prec.right(seq(
+      $.entry,
+      $._newline,
+      repeat(
+        choice(
+          $.member,
+          $.comment
+        )
+      )
+    )),
+    entry: $ => prec.right(seq(
+      $.identifier,
+      repeat(
+        seq(
+          token('.'),
+          $.identifier
+        )
+      )
+    )),
+    member: $ => seq(
+      $.member_type,
+      $._label,
+      optional($.type_annotation),
+      optional($.parameter_list),
+      optional($.return_statement),
+      optional($.throw_statement),
+      $._newline,
+    ),
+    member_type: $ => choice(
+      '::',
+      '->',
+      '<-',
+      '~>',
+      '<~',
+      '+>',
+      '<+',
+      '#',
+      '+',
+      '-'
+    ),
+    parameter_list: $ => seq(
+      '(',
+        optional($._identifier_list),
+      ')'
+    ),
+    return_statement: $ => seq(
+      '=>',
+      $.entry
+    ),
+    throw_statement: $ => seq(
+      '#>',
+      $._entry_list
+    ),
+    _entry_list: $ => prec.left(seq(
+      $.entry,
+      repeat(
+        seq(
+          ',',
+          $.entry
+        )
+      )
+    )),
+    _identifier_list: $ => seq(
+      $.identifier,
+      repeat(
+        seq(
+          ',',
+          $.identifier
+        )
+      )
+    ),
+    identifier: $ => prec.left(seq(
+      $._label,
+      optional($.type_annotation),
+      optional($.parameter_list),
+      optional($.return_statement),
+      optional($.throw_statement),
+    )),
+    type_annotation: $ => seq(
+      '<',
+      $._entry_list,
+      '>'
+    ),
+    comment: $ => seq(
+      '//',
+      /[^\n]*/,
+      $._newline,
+    ),
+    _label: $ => /[a-zA-Z0-9][a-zA-Z0-9_-]*/,
+    _newline: $ => token('\n')
+  }
+});