elm-spanned-string

Span substrings in a given string.

Motivation

The intention of this package it to help you span substrings in a given string. Is is a very tiny package, containing a SpannedString type which is a simple alias, and a span function.

The typical use case is rendering bold matched substrings in suggested strings during a search.

Implementation details

The given string is first converted to a List Char. Characters are spanned one by one, then similar neighboors are associated to reconstruct a list of spanned strings.

Example

Here is an example.

import SpannedString exposing (span)

format : String -> List Int -> List (Html msg)
format string indices =
    span string indices
        |> List.map
            (\( string, isSpanned ) ->
                if isSpanned then
                    strong [] [ text string ]

                else
                    text string
            )