#191 · Programming Language Tools Developer Tool

Swift Viewer

View Swift source code in a clean, line-numbered layout and extract imports, classes, structs, enums, protocols, extensions, functions, and properties without installing an IDE.

Developer Input

Swift file or snippet

Swift source code

import Foundation

struct User {
    let name: String
    func greeting() -> String {
        return "Hello, \(name)"
    }
}

extension User {
    var isNamed: Bool { !name.isEmpty }
}

View mode

Search term

text

Trim whitespace Preserve multiple empty lines Enable strict analysis Auto-run while typing

How to use this developer tool

Paste a Swift file or source snippet.
Select a line-numbered view, symbol outline, or combined report.
Optionally enter a search term to mark matching lines.
Run the viewer, then copy or download the result.

What this developer tool does

The viewer preserves source order, adds stable line numbers, detects common Swift declarations, and builds a compact outline for faster navigation.

Normalize line endings → scan declarations → build symbol outline → number source lines → highlight search matches → calculate live statistics.

This browser-based viewer uses deterministic token and declaration matching. It does not compile Swift or replace Xcode diagnostics.

Example

Input: a Swift struct with one method. Output: numbered source plus a hierarchy showing the struct and method declarations.

Tips for better output

Use the combined mode for unfamiliar files.
Search by type or method name to isolate relevant lines.
Run Swift Validator when compile-level syntax confidence is required.

FAQ

How can I view a Swift file with line numbers online?

Paste the Swift source, choose Line-numbered code, and run the viewer. The output assigns a stable number to every line.

Can a Swift viewer list structs, classes, enums, and protocols?

Yes. This tool scans declarations for classes, structs, enums, protocols, extensions, functions, and stored properties.

Does this Swift code viewer support SwiftUI source files?

Yes for viewing and structural extraction. It recognizes standard declarations used in SwiftUI files, but it does not render a SwiftUI preview.

How do I search for a method inside a large Swift file?

Enter the method name in Search term. Matching source lines are marked in the generated view.

Can I download the line-numbered Swift output?

Yes. Use Download after processing to save the generated report as a text file.

Related developer tools

TypeScript Checker TypeScript Generator TypeScript Formatter TypeScript Converter

Detected Swift elements

Element	Detection
Types	class, struct, enum, protocol
Extensions	extension declarations
Members	func, let, var

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