Proposal: Prefix-based HTML DSL

[pimbrouwers]

Proposal: Prefix-based HTML DSL for Falco.Markup

Problem Statement

Currently, Falco.Markup users need to use prefix notation (i.e., Elem.div, or self alias) for both the Elem and Attr modules. When the complexity of the markup increases, the level of noise created is substantial.

Proposed Solution

Full implementation can be found here.

Implement a unified DSL module with consistent prefix-based naming:

• Single underscore (_) prefix for HTML elements
• Double underscore (__) prefix for attributes
• Single underscore (_) suffix for text elements

Implementation Details

namespace Falco.Markup

[<AutoOpen>]
module Html =
    // Element aliases
    let inline _div attr content = Elem.div attr content
    let inline _span attr content = Elem.span attr content
    
    // Text aliases
    let h1_ content = Text.h1 content
    let p_ content = Text.p content

    // Attribute aliases
    let inline __class value = Attr.class' value
    let inline __id value = Attr.id value 

Benefits

1. Visual "noise" reduction - Cleaner, more readable code
2. Conflict avoidance - Prefixes prevent naming collisions
3. Backward compatibility - Original modules remain unchanged

Example Usage

open Falco.Markup

let myComponent =
    _div [ __class "container" ] [
        _h1 [ __id "title" ] [ "Hello World" ]
        p_ "This is a paragraph"
    ]

Migration

No breaking changes - existing code continues to work while new code can adopt the prefixed approach.

[jkone27]

why not just single letter modules and double ticked for reserved keywords? https://stackoverflow.com/questions/6639688/using-keywords-as-identifiers-in-f

let myComponent =
    m.div [ a.``class`` "container" ] [
        m.h1 [ a.id "title" ] [ "Hello World" ]
        m.p "This is a paragraph"
    ]

[pimbrouwers]

why not just single letter modules and double ticked for reserved keywords? https://stackoverflow.com/questions/6639688/using-keywords-as-identifiers-in-f

let myComponent =
    m.div [ a.``class`` "container" ] [
        m.h1 [ a.id "title" ] [ "Hello World" ]
        m.p "This is a paragraph"
    ]

I appreciate the feedback! It's not a matter of the protected keywords, those are dealt with currently using single quote ticks (i.e., Attr.class') which is the style I prefer. The idea behind this, is to provide a more terse way to document complex HTML, and get away from the module prefixing altogether with backward compat.

[pimbrouwers]

After careful consideration and refinement, I am confident in the implementation and its benefits. The prefix-based HTML DSL for Falco.Markup achieves the goals of reducing visual noise, avoiding naming conflicts, and maintaining backward compatibility.

The unified DSL module introduces consistent prefix-based naming conventions for elements, text shortcuts, and attributes, making code cleaner and more readable. The example usage demonstrates how this approach simplifies markup creation while preserving the flexibility of the original modules.

I believe this enhancement will significantly improve the developer experience for Falco.Markup users. As the PR has been open for some time and no further concerns have been raised, I am happy with the result and ready to move forward.

Thank you again for your support and collaboration!