diff --git a/Sources/MathTexParser/MathTexParser.swift b/Sources/MathTexParser/MathTexParser.swift
new file mode 100644
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+++ b/Sources/MathTexParser/MathTexParser.swift
@@ -0,0 +1,77 @@
+//
+//  MathTexParser.swift
+//
+//
+//  Created by Peter Tang on 22/9/2023.
+//
+
+import Foundation
+// import Antlr4
+// import TexParser
+import Patterns
+import SwiftPEG
+
+internal class MathTexParser {
+    // func parse(input: String) {
+    //     let iStream = ANTLRInputStream(input)
+    //     let lexer = TeXLexer(iStream)
+    //     let tokenStream = CommonTokenStream(lexer)
+    //     if let parser = try? TeXParser(tokenStream), let _ = try? parser.prog() {
+    //     }
+    // }
+    
+    typealias RangesAndProperties = [(range: ClosedRange<UInt32>, property: Substring)]
+
+    func unicodeParse(fromDataFile text: String) -> RangesAndProperties {
+        let hexNumber = Capture(name: "hexNumber", hexDigit+)
+        let hexRange = hexNumber • ".." • hexNumber / hexNumber
+        let rangeAndProperty = Line.Start() • hexRange • Skip() • "; " • Capture(name: "property", Skip()) • " "
+
+        return try! Parser(search: rangeAndProperty).matches(in: text).map { match in
+            let propertyName = text[match[one: "property"]!]
+            let oneOrTwoNumbers = match[multiple: "hexNumber"].map { UInt32(text[$0], radix: 16)! }
+            let range = oneOrTwoNumbers.first! ... oneOrTwoNumbers.last!
+            return (range, propertyName)
+        }
+    }
+    func texParseWithPatterns(fromDataFile text: String) -> RangesAndProperties {
+        // I might need a syntax tree as an output instead of just a list.
+        return []
+    }
+    func markdownParseWithSwiftPEG(fromDataFile text: String) {
+        let markdownSyntax = #"""
+            raw_text = ~"[^\n]+"
+            bold_text = ("**" raw_text "**") / ("__" raw_text "__")
+            text = (bold_text / raw_text)
+
+            h1 = "# " text
+            h2 = "## " text
+            h3 = "### " text
+            h4 = "#### " text
+            h5 = "##### " text
+            h6 = "######" text
+            header = (h6 / h5 / h4 / h3 / h2 / h1)
+
+            ordered_list = (~"[0~9]+\. " text ~"\n")+
+
+            unordered_list = (~"[-*+] " text ~"\n")+
+
+            link = "[" raw_text "]" "(" raw_text ")"
+
+            image = "![" raw_text "]" "(" raw_text ")"
+
+            paragraph = (header / text)?
+            doc = (paragraph ~"\n\n")* paragraph
+        """#
+
+        // Initialize the parser
+        let markdownParser: SwiftPEG.Grammar = Grammar(rules: markdownSyntax)
+        // Get the AST root node from the parser with the name of the rule you defined in the syntax.
+        guard let ast: Node = markdownParser.parse(for: text, with: "doc") else { return }
+        // Then do what ever you like with the AST
+
+        // Or your can use the simplified AST which only contains node with named rule
+        let simplifiedAst: SwiftPEG.SimplifiedNode? = simplify(for: ast)
+    }
+}
+