Add floatingValue to FloatLiteralExprSyntax

Author: kimdv

Sources/SwiftSyntax/Convenience.swift

@@ -68,6 +68,16 @@ extension EnumCaseParameterSyntax {
   }
 }
 
+extension FloatLiteralExprSyntax {
+  public var floatingValue: Double? {
+    let floatingDigitsWithoutUnderscores = literal.text.filter {
+      $0 != "_"
+    }
+
+    return Double(floatingDigitsWithoutUnderscores)
+  }
+}
+
 extension IntegerLiteralExprSyntax {
   public enum Radix {
     case binary

Tests/SwiftSyntaxTest/SyntaxTests.swift

@@ -190,4 +190,17 @@ class SyntaxTests: XCTestCase {
       XCTAssertEqual(expr.integerValue, expected, line: line)
     }
   }
+
+    func testFloatLiteralExprSyntax() {
+        let testCases: [UInt: (String, Double?)] = [
+            #line: ("2", 2),
+            #line: ("2_00_00.001", 20000.001),
+        ]
+
+        for (line, testCase) in testCases {
+            let (value, expected) = testCase
+            let expr = FloatLiteralExprSyntax(literal: .floatLiteral(value))
+            XCTAssertEqual(expr.floatingValue, expected, line: line)
+        }
+    }
 }