Mithril port of react-fontawesome

mithril-fontawesome.js

// This is a direct API port of https://github.com/FortAwesome/react-fontawesome
// to Mithril, with a few optimizations for faster vnode creation and more
// efficient normalization. It's also combined into a single UMD file and
// written to support a pure ES5 environment without transpiling. It's less than
// 200 lines of code excluding this long introductory comment, and is about
// 1.2KB min+gzip.
// 
// Here's a few example vnodes:
// 
// ```js
// m(FontAwesomeIcon, {icon: "spinner", size: "xs"})
// m(FontAwesomeIcon, {icon: "spinner", fixedWidth: true})
// m(FontAwesomeIcon, {icon: faCoffee})
// ```
// 
// This file is licensed under the following license (ISC License):
// 
// Copyright (c) 2019 and later, Isiah Meadows <contact@isiahmeadows.com>.
// 
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
// 
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

;(function (factory) {
    if (typeof module === "object" && module.exports) {
        module.exports = factory(
            require("mithril/render/vnode"),
            require("@fortawesome/fontawesome-svg-core")
        )
    } else {
        window.FontAwesomeIcon = factory(m.vnode, FontAwesome)
    }
})(function (Vnode, FontAwesome) {
    "use strict"

    var magicProp = new RegExp("^(" + [
        // Mithril keys
        "key",
        "oninit", "oncreate",
        "onbeforeupdate", "onupdate",
        "onbeforeremove", "onremove",

        // Style keys
        "class", "className",

        // Font Awesome keys
        "border", "mask", "fixedWidth", "inverse", "flip", "icon", "listItem",
        "pull", "pulse", "rotation", "size", "spin", "symbol", "title", "transform",
    ].join("|") + ")$")

    var shouldLog = console && typeof console.error === "function"

    try {
        shouldLog = process.env.NODE_ENV !== "production"
    } catch (e) {
        // ignore
    }

    return {
        view: function (vnode) {
            var iconOpts = {
                symbol: vnode.attrs.symbol,
                title: vnode.attrs.title,
            }

            var classObject = Object.create(null)
            if (vnode.attrs.spin) classObject["fa-spin"] = true
            if (vnode.attrs.pulse) classObject["fa-pulse"] = true
            if (vnode.attrs.fixedWidth) classObject["fa-fw"] = true
            if (vnode.attrs.inverse) classObject["fa-inverse"] = true
            if (vnode.attrs.border) classObject["fa-border"] = true
            if (vnode.attrs.listItem) classObject["fa-li"] = true

            if (vnode.attrs.flip === "horizontal" || vnode.attrs.flip === "both") {
                classObject["fa-flip-horizontal"] = true
            }

            if (vnode.attrs.flip === "vertical" || vnode.attrs.flip === "both") {
                classObject["fa-flip-vertical"] = true
            }

            if (vnode.attrs.size) {
                classObject["fa-" + vnode.attrs.size] = true
            }

            if (vnode.attrs.rotation) {
                classObject["fa-rotate-" + vnode.attrs.rotation] = true
            }

            if (vnode.attrs.pull) {
                classObject["fa-pull-" + vnode.attrs.pull] = true
            }

            appendClassString(classObject, vnode.attrs.class)
            appendClassString(classObject, vnode.attrs.className)
            var classes = Object.keys(classObject)
            if (classes.length) iconOpts.classes = classes

            var mask = normalizeIconArgs(vnode.attrs.mask)
            if (mask) iconOpts.mask = mask

            var transform = typeof vnode.attrs.transform === "string"
                ? FontAwesome.parse.transform(vnode.attrs.transform)
                : vnode.attrs.transform
            if (Array.isArray(transform) ? transform.length : transform) {
                iconOpts.transform = transform
            }
            
            var iconLookup = normalizeIconArgs(vnode.attrs.icon)
            var renderedIcon = FontAwesome.icon(iconLookup, iconOpts)
            
            if (!renderedIcon) {
                if (shouldLog) console.error("Could not find icon", iconLookup)
                return void 0
            }

            var result = convert(renderedIcon.abstract[0])

            if (typeof result !== "string") {
                for (var key in vnode.attrs) {
                    if (Object.prototype.hasOwnProperty.call(vnode.attrs, key)) {
                        if (key === "style") {
                            for (key in vnode.attrs.style) {
                                if (Object.prototype.hasOwnProperty.call(
                                    vnode.attrs.style, key
                                )) {
                                    result.attrs.style[key] = vnode.attrs.style[key]
                                }
                            }
                        } else if (!magicProp.test(key)) {
                            result.attrs.style[key] = vnode.attrs[key]
                        }
                    }
                }
            }

            return result
        }
    }

    function convert(element) {
        if (typeof element === "string") {
            return Vnode("#", void 0, void 0, element, void 0, void 0)
        }
        var hasKey = false
        for (var key in element.attributes) {
            if (Object.prototype.hasOwnProperty.call(element.attributes, key)) {
                hasKey = true
                if (key === "style") {
                    var properties = element.attributes[key].split(";")
                    var target = element.attributes[key] = {}

                    for (var i = 0; i < properties.length; i++) {
                        var pair = properties[i]
                        if (!/^\s*(:\s*)?$/.test(pair)) {
                            var index = pair.indexOf(":")
                            target[pair.slice(0, index).trim()] =
                                pair.slice(index + 1).trim()
                        }
                    }
                }
            }
        }

        var children, text

        if (element.children && element.children.length) {
            if (
                element.children.length === 1 &&
                typeof element.children[0] === "string"
            ) {
                text = element.children[0]
            } else {
                children = element.children
                for (i = 0; i < children.length; i++) {
                    children[i] = convert(children[i])
                }
            }
        }

        return Vnode(
            element.tag, void 0, hasKey ? element.attributes : void 0,
            children, text, void 0
        )
    }

    function appendClassString(classObject, string) {
        if (!string) return
        var list = string.trim().split(/\s+/g)
        for (var i = 0; i < list.length; i++) classObject[list[i]] = true
    }

    function normalizeIconArgs(icon) {
        if (typeof icon === "string") {
            return {prefix: "fas", iconName: icon}
        } else if (Array.isArray(icon) && icon.length === 2) {
            return {prefix: icon[0], iconName: icon[1]}
        } else if (typeof icon === "object" && icon.prefix && icon.iconName) {
            return icon
        } else {
            return void 0
        }
    }
});