From 104bd272f9b54eb0fe0cd795c7f6427be7011e34 Mon Sep 17 00:00:00 2001
From: Anoop M D <anoop.md1421@gmail.com>
Date: Fri, 3 Feb 2023 04:39:45 +0530
Subject: [PATCH] feat: bru lang - simple parser

---
 packages/bruno-lang/package.json           |  3 +-
 packages/bruno-lang/v2/src/index.js        | 55 ++++++++++++++++++++++
 packages/bruno-lang/v2/tests/index.spec.js | 17 +++++++
 3 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 packages/bruno-lang/v2/src/index.js
 create mode 100644 packages/bruno-lang/v2/tests/index.spec.js

diff --git a/packages/bruno-lang/package.json b/packages/bruno-lang/package.json
index c243c7980..632aed4c5 100644
--- a/packages/bruno-lang/package.json
+++ b/packages/bruno-lang/package.json
@@ -10,6 +10,7 @@
     "test": "jest"
   },
   "dependencies": {
-    "arcsecond": "^5.0.0"
+    "arcsecond": "^5.0.0",
+    "ohm-js": "^16.6.0"
   }
 }
diff --git a/packages/bruno-lang/v2/src/index.js b/packages/bruno-lang/v2/src/index.js
new file mode 100644
index 000000000..563cdcfc2
--- /dev/null
+++ b/packages/bruno-lang/v2/src/index.js
@@ -0,0 +1,55 @@
+const ohm = require("ohm-js");
+
+const grammar = ohm.grammar(`Bru {
+  Headers = "headers" "{" PairList "}"
+  PairList = Pair ("," Pair)*
+  Pair = Key ":" Value
+  Key = identifier
+  Value = stringLiteral
+  identifier = alnum*
+  stringLiteral = letter*
+}`);
+
+const sem = grammar.createSemantics().addAttribute('ast', {
+  Headers(_, _1, PairList, _2) {
+    return PairList.ast;
+  },
+  PairList(pairs, _, rest) {
+    return [pairs.ast, ...rest.ast];
+  },
+  Pair(key, _, value) {
+    return { key: key.ast, value: value.ast };
+  },
+  Key(id) {
+    return id.sourceString;
+  },
+  Value(str) {
+    return str.sourceString;
+  },
+  identifier(id) {
+    return id.sourceString;
+  },
+  stringLiteral(str) {
+    return str.sourceString;
+  },
+  _iter(...elements) {
+    return elements.map(e => e.ast);
+  }
+});
+
+const input = `headers {
+  hello: world,
+  foo: bar
+}`;
+
+const parser = (input) => {
+  const match = grammar.match(input);
+
+  if(match.succeeded()) {
+    return sem(match).ast;
+  } else {
+    throw new Error(match.message);
+  }
+}
+
+module.exports = parser;
diff --git a/packages/bruno-lang/v2/tests/index.spec.js b/packages/bruno-lang/v2/tests/index.spec.js
new file mode 100644
index 000000000..e2d701092
--- /dev/null
+++ b/packages/bruno-lang/v2/tests/index.spec.js
@@ -0,0 +1,17 @@
+const parser = require("../src/index");
+
+describe("parser", () => {
+  it("should parse headers", () => {
+    const input = `headers {
+      hello: world,
+      foo: bar
+    }`;
+
+    const expected = [
+      { key: "hello", value: "world" },
+      { key: "foo", value: "bar" }
+    ];
+
+    expect(parser(input)).toEqual(expected);
+  });
+});