const t = require('@babel/types')
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const {
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VAR_MP,
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VAR_ROOT,
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VAR_ORIGINAL,
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VAR_INDEX,
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INTERNAL_GET_ORIG,
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IDENTIFIER_METHOD,
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IDENTIFIER_FILTER
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} = require('../../constants')
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/**
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* e0=e=>count++
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*/
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function getEventExpressionStatement (left, right) {
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return t.expressionStatement(
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t.assignmentExpression(
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'=',
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left,
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right
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)
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)
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}
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/**
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* if(!_isMounted){}
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*/
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function getInItIfStatement (expressionStatementArray) {
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return t.ifStatement(
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t.unaryExpression(
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'!',
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t.identifier('_isMounted')
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),
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t.blockStatement(expressionStatementArray)
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)
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}
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function getRenderSlotStatement (state, renderSlotStatementArray, forItem) {
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function cloneNode (node) {
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if (Array.isArray(node)) {
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return node.map(function (item) {
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return cloneNode(item)
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})
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} else if (typeof node === 'object') {
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if (!node) {
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return node
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}
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if (t.isMemberExpression(node)) { // 纠正被处理过的对象
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const name = node.object.name
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// identifier 使用原值以被后续修改
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if ((name === VAR_ROOT || name === forItem) && t.isIdentifier(node.property) && [IDENTIFIER_METHOD, IDENTIFIER_FILTER].includes(node.property.name)) {
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return node.property
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}
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} else if (t.isIdentifier(node, { name: forItem })) { // 预处理 forItem
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return t.identifier(VAR_ORIGINAL)
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}
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const target = Object.create(node)
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Object.keys(node).forEach(function (key) {
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target[key] = cloneNode(node[key])
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})
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return target
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} else {
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return node
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}
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}
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renderSlotStatementArray.forEach(renderSlotStatement => {
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const argument = renderSlotStatement.expression.arguments[1]
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if (t.isObjectExpression(argument)) {
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// 克隆以避免影响模板
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argument.properties = cloneNode(argument.properties)
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}
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})
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const blockStatement = t.blockStatement(renderSlotStatementArray)
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if (state.options.scopedSlotsCompiler === 'auto') {
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return t.ifStatement(
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t.binaryExpression('===',
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t.memberExpression(t.memberExpression(t.identifier('$scope'), t.identifier(state.options.platform.name === 'mp-alipay' ? 'props' : 'data')), t.identifier('scopedSlotsCompiler')), t.stringLiteral('augmented')
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),
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blockStatement
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)
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}
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return blockStatement
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}
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/**
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* items.map(function(item,index){return {}})
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*/
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function getMapCallExpression (
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object,
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objectPropertyArray,
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declarationArray,
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renderSlotStatementArray,
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eventPropertyArray,
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forItem,
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forKey,
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forIndex,
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state
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) {
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const blockStatement = []
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// var $orgi = __get_orig(forItem)
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blockStatement.push(t.variableDeclaration('var', [
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t.variableDeclarator(t.identifier(VAR_ORIGINAL), t.callExpression(t.identifier(INTERNAL_GET_ORIG), [
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t.identifier(forItem)
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]))
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]))
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if (declarationArray.length) {
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declarationArray.forEach(declaration => {
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blockStatement.push(declaration)
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})
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}
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if (renderSlotStatementArray.length) {
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blockStatement.push(getRenderSlotStatement(state, renderSlotStatementArray, forItem))
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}
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blockStatement.push(t.returnStatement(
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// return {$orgi:$orgi}
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t.objectExpression(
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[
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t.objectProperty(
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t.identifier(VAR_ORIGINAL),
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t.identifier(VAR_ORIGINAL)
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)
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].concat(objectPropertyArray)
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.concat(forKey && forIndex ? [t.objectProperty(
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t.identifier(VAR_INDEX),
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t.identifier(forIndex)
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)] : [])
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)
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))
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const params = [t.identifier(forItem)]
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if (forKey) {
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params.push(t.identifier(forKey))
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}
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if (forIndex) {
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params.push(t.identifier(forIndex))
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}
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return t.callExpression(t.identifier('__map'), [
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object,
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t.functionExpression(
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null,
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params,
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t.blockStatement(blockStatement)
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)
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])
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}
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/**
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* $mp.data = Object.assign({},{$root:{}})
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*/
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function getDataExpressionStatement (objectPropertyArray) {
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return t.expressionStatement(
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t.assignmentExpression(
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'=',
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t.memberExpression(
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// left
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t.identifier(VAR_MP),
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t.identifier('data')
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),
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t.callExpression(
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// right
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t.memberExpression(
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// Object.assign
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t.identifier('Object'),
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t.identifier('assign')
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),
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[
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t.objectExpression([]), // {}
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t.objectExpression([
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// {$root:{}}
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t.objectProperty(
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t.identifier(VAR_ROOT),
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t.objectExpression(objectPropertyArray)
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)
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])
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]
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)
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)
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)
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}
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module.exports = {
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getInItIfStatement,
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getMapCallExpression,
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getDataExpressionStatement,
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getEventExpressionStatement,
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getRenderSlotStatement
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}
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