feat: implement grammar

Author: ObserverOfTime

Cargo.lock

@@ -10,8 +10,100 @@
 module.exports = grammar({
   name: "cst",
 
+  extras: _ => [],
+
   rules: {
-    // TODO: add the actual grammar rules
-    source_file: $ => "hello"
+    cst: $ => seq(
+      optional($._eol),
+      repeat($._line),
+      optional($._eol)
+    ),
+
+    _line: $ => seq(
+      optional($.range),
+      repeat1($._space),
+      choice(
+        $.node,
+        $.text,
+        $.literal,
+        $.error,
+        $.missing
+      ),
+      $._eol
+    ),
+
+    range: $ => seq(
+      field("start", $.position),
+      repeat1($._space),
+      "-",
+      $._space,
+      field("end", $.position)
+    ),
+
+    position: $ => seq(
+      field("row", $.number),
+      ":",
+      field("column", $.number)
+    ),
+
+    node: $ => seq(
+      optional($.field),
+      optional($._mark),
+      alias($._identifier, $.kind),
+      choice(
+        optional($._space),
+        seq($._space, $.text)
+      )
+    ),
+
+    text: $ => seq(
+      "`",
+      $.content,
+      "`"
+    ),
+
+    literal: $ => seq(
+      "\"",
+      $.content,
+      "\""
+    ),
+
+    error: $ => seq(
+      $._mark,
+      "ERROR",
+      choice(
+        optional($._space),
+        seq($._space, $.text)
+      )
+    ),
+
+    missing: $ => seq(
+      "MISSING",
+      token.immediate(":"),
+      $._space,
+      $.literal
+    ),
+
+    field: $ => seq(
+      field("name", $._identifier),
+      token.immediate(":"),
+      $._space
+    ),
+
+    content: $ => repeat1(
+      choice(/[^\r\n]/, field("escape", $._escape))
+    ),
+
+    _identifier: _ => /[\w-][\w.-]*/,
+
+    _escape: _ => /\\[abeEfnrtv\\]/,
+
+    number: _ => /\d+/,
+
+    _mark: _ => "\u2022",
+
+    _space: _ => / /,
+
+    _eol: _ => /[\r\n]|\r\n/
   }
 });