From ea0baf1bb82d40ebfcaca1de6a2a0f6d56c709e7 Mon Sep 17 00:00:00 2001
From: Akshay Nair <phenax5@gmail.com>
Date: Mon, 24 Jan 2022 22:06:03 +0530
Subject: feat(parser): implements regex literal parser

---
 src/parser/index.ts | 15 ++++++++++++++-
 src/types.ts        |  1 +
 2 files changed, 15 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/parser/index.ts b/src/parser/index.ts
index a336b83..7f0e945 100644
--- a/src/parser/index.ts
+++ b/src/parser/index.ts
@@ -129,9 +129,22 @@ const stringLiteral: Parser<Literal> = mapTo(
   s => Literal.String(s.join('')),
 )
 
+const REGEX_FLAGS = ['m', 'g', 'i', 'd', 's', 'u', 'y']
+const regexDelimiter = prefixed(optional(matchChar('\\')), matchChar('/'))
+const regexLiteral: Parser<Literal> = mapTo(
+  prefixed(
+    regexDelimiter,
+    pair(
+      manyTill(satisfyChar(_ => true), regexDelimiter),
+      many0(satisfyChar(c => REGEX_FLAGS.includes(c)))
+    ),
+  ),
+  ([rs, flags]) => Literal.RegExp(new RegExp(rs.join(''), flags.join(''))),
+)
+
 const literalP: Parser<Literal> = delimited(
   whitespaces0,
-  or([booleanLiteral, numberLiteral, stringLiteral]),
+  or([booleanLiteral, numberLiteral, stringLiteral, regexLiteral]),
   whitespaces0,
 )
 
diff --git a/src/types.ts b/src/types.ts
index dd40ce9..f02fca6 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -7,6 +7,7 @@ export type index = number
 
 export type Literal = Union<{
   String: string
+  RegExp: RegExp
   Number: number
   Boolean: boolean
 }>
-- 
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