Add floatingValue to FloatLiteralExprSyntax

Author: kimdv

Sources/SwiftSyntax/Convenience.swift

@@ -68,6 +68,21 @@ extension EnumCaseParameterSyntax {
   }
 }
 
+extension FloatLiteralExprSyntax {
+  ///  A computed property representing the floating-point value parsed from the associated `literal.text` property.
+  ///
+  /// - Returns: A double value parsed from the associated`literal.text`, or `nil` if the text cannot be parsed as a double.
+  public var representedLiteralValue: Double? {
+    guard !hasError else { return nil }
+
+    let floatingDigitsWithoutUnderscores = literal.text.filter {
+      $0 != "_"
+    }
+
+    return Double(floatingDigitsWithoutUnderscores)
+  }
+}
+
 extension IntegerLiteralExprSyntax {
   public enum Radix {
     case binary

Tests/SwiftSyntaxTest/SyntaxTests.swift

@@ -198,4 +198,25 @@ class SyntaxTests: XCTestCase {
       XCTAssertEqual(expr.representedLiteralValue, expected, line: line)
     }
   }
+
+  func testFloatLiteralExprSyntax() {
+    let testCases: [UInt: (String, Double?)] = [
+      #line: ("2", 2),
+      #line: ("2_00_00.001", 2_00_00.001),
+      #line: ("5.3_8", 5.3_8),
+      #line: ("12e3", 12000.0),
+      #line: ("32E1", 320.0),
+      #line: ("0xdEFACE.C0FFEEp+1", 0xdEFACE.C0FFEEp+1),
+      #line: ("0xaffab1e.e1fP-2", 0xaffab1e.e1fP-2),
+      #line: ("🥥", nil),
+      #line: ("12e+3", 12000.0),
+      #line: ("12e-3", 0.012),
+    ]
+
+    for (line, testCase) in testCases {
+      let (value, expected) = testCase
+      let expr = FloatLiteralExprSyntax(literal: .floatLiteral(value))
+      XCTAssertEqual(expr.representedLiteralValue, expected, line: line)
+    }
+  }
 }