patch.js

var document = require("global/document")
var isArray = require("x-is-array")

var domIndex = require("./dom-index")
var patchOp = require("./patch-op")
module.exports = patch

function patch(rootNode, patches) {
    return patchRecursive(rootNode, patches)
}

function patchRecursive(rootNode, patches, renderOptions) {
    var indices = patchIndices(patches)

    if (indices.length === 0) {
        return rootNode
    }

    var index = domIndex(rootNode, patches.a, indices)
    var ownerDocument = rootNode.ownerDocument

    if (!renderOptions) {
        renderOptions = { patch: patchRecursive }
        if (ownerDocument !== document) {
            renderOptions.document = ownerDocument
        }
    }

    for (var i = 0; i < indices.length; i++) {
        var nodeIndex = indices[i]
        rootNode = applyPatch(rootNode,
            index[nodeIndex],
            patches[nodeIndex],
            renderOptions)
    }

    return rootNode
}

function applyPatch(rootNode, domNode, patchList, renderOptions) {
    if (!domNode) {
        return rootNode
    }

    var newNode

    if (isArray(patchList)) {
        for (var i = 0; i < patchList.length; i++) {
            newNode = patchOp(patchList[i], domNode, renderOptions)

            if (domNode === rootNode) {
                rootNode = newNode
            }
        }
    } else {
        newNode = patchOp(patchList, domNode, renderOptions)

        if (domNode === rootNode) {
            rootNode = newNode
        }
    }

    return rootNode
}

function patchIndices(patches) {
    var indices = []

    for (var key in patches) {
        if (key !== "a") {
            indices.push(Number(key))
        }
    }

    return indices
}