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index.js
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index.js
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const { getAttrASTAndIndexByName, transformIfBinding, findNextNode, removeNode, transformElseIfBindings, transformElseBinding } = require("./lib")
const defaultOpts = {
ifAttrName: 'r-if',
elseAttrName: 'r-else',
elseIfAttrName: 'r-else-if'
}
module.exports = function () {
// 以if为初始起点 再转化底下相关的else-if else 周而复始 就解决了关联性的问题了
function JSXElementVisitor(path) {
const {
ifAttrName,
elseAttrName,
elseIfAttrName
} = defaultOpts;
const ifBinding = getAttrASTAndIndexByName(path.node, ifAttrName)
if (!ifBinding) { return }
let {
parent: { children: siblings },
key: index
} = path
let nextNode = findNextNode(path, siblings, index)
let elseBinding = getAttrASTAndIndexByName(nextNode, elseAttrName);
let elseIfBinding = getAttrASTAndIndexByName(nextNode, elseIfAttrName);
/******************* 处理只有if的情况 ******************************/
if (!nextNode || !elseBinding && !elseIfBinding) { return transformIfBinding(path, ifBinding) }
const elseIfBindings = []
/******************* 处理if else-if else情况 ******************************/
if (!elseBinding) {
let elseIfBinding = getAttrASTAndIndexByName(nextNode, elseIfAttrName)
while (elseIfBinding) {
elseIfBindings.push(elseIfBinding)
index += 1
nextNode = findNextNode(path, siblings, index)
elseIfBinding = nextNode ? getAttrASTAndIndexByName(nextNode, elseIfAttrName) : null
}
if (nextNode) {
elseBinding = getAttrASTAndIndexByName(nextNode, elseAttrName)
}
}
if (elseIfBindings.length > 0) {
transformElseIfBindings(path, ifBinding, elseIfBindings, elseBinding)
elseIfBindings.forEach((binding) => {
removeNode(siblings, binding.node);
})
if (elseBinding) {
removeNode(siblings, elseBinding.node);
}
}
/********************** if else情况*********************************/
else if (elseBinding) {
transformElseBinding(path, ifBinding, elseBinding);
removeNode(siblings, elseBinding.node);
}
}
return {
visitor: {
JSXElement: JSXElementVisitor
}
}
}