if 如果

if

类型: MethodDeclaration

所属类: CommandFunctionList

定义位置: command.ts

描述

如果

参数

参数名	类型	描述	默认值
\{branches, elseCommands\}	`{
branches: Array<any>
elseCommands?: CommandDataList
}`	-	-

返回值

类型: CommandFunction

源代码

位置: 第 2735 行

protected if({branches, elseCommands}: {
    branches: Array<any>
    elseCommands?: CommandDataList
  }): CommandFunction {
    const {commands, index} = this.stack.get()
    const pop = Command.goto(commands, index + 1)
    const length = branches.length
    const testers = new Array(length)
    const functions = new Array(length)
    for (let i = 0; i < length; i++) {
      const {mode, conditions, commands} = branches[i]
      testers[i] = Command.compileConditions(mode, conditions)
      functions[i] = Command.goto(Command.compile(commands, pop), 0)
    }
    const elseFn = elseCommands !== undefined
    ? Command.goto(Command.compile(elseCommands, pop), 0)
    : Command.skip
    if (length < 6) {
      const [a, b, c, d, e] = testers
      const [f, g, h, i, j] = functions
      switch (length) {
        case 1: return () => (a() ? f : elseFn)()
        case 2: return () => (a() ? f : b() ? g : elseFn)()
        case 3: return () => (a() ? f : b() ? g : c() ? h : elseFn)()
        case 4: return () => (a() ? f : b() ? g : c() ? h : d() ? i : elseFn)()
        case 5: return () => (a() ? f : b() ? g : c() ? h : d() ? i : e() ? j : elseFn)()
      }
    }
    return () => {
      for (let i = 0; i < length; i++) {
        if (testers[i]()) {
          return functions[i]()
        }
      }
      return elseFn()
    }
  }

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文档生成时间：2025/7/21 20:53:39