XSLT 是一种函数式编程语言吗? [英] Is XSLT a functional programming language?

问题描述

关于函数式编程语言的几个问题让我开始思考 XSLT 是否是一种函数式编程语言.如果没有，缺少哪些功能?XSLT 2.0 是否缩短或缩小了差距?

Several questions about functional programming languages have got me thinking about whether XSLT is a functional programming language. If not, what features are missing? Has XSLT 2.0 shortened or closed the gap?

推荐答案

XSLT 是声明性的，而不是有状态的.

XSLT is declarative as opposed to stateful.

虽然 XSLT 是基于函数式编程思想的，但它并不是一种完整的函数式编程语言，它缺乏将函数视为第一类数据类型的能力.它具有惰性求值等元素，可减少不必要的求值，并且没有显式循环.

Although XSLT is based on functional programming ideas, it is not a full functional programming language, it lacks the ability to treat functions as a first class data type. It has elements like lazy evaluation to reduce unneeded evaluation and also the absence of explicit loops.

不过，就像函数式语言一样，我认为它可以通过跨多个处理器的自动安全多线程很好地并行化.

Like a functional language though, I would think that it can be nicely parallelized with automatic safe multi threading across several processors.

来自 XSLT 上的维基百科:

作为一种语言，XSLT 受函数式语言，以及基于文本的模式匹配语言像 SNOBOL 和 awk.它最直接前身是 DSSSL，一种语言对 SGML 执行相同的功能XSLT 对 XML 执行的操作.XSLT 可以也被认为是一个模板处理器.

As a language, XSLT is influenced by functional languages, and by text-based pattern matching languages like SNOBOL and awk. Its most direct predecessor was DSSSL, a language that performed the same function for SGML that XSLT performs for XML. XSLT can also be considered as a template processor.

这是一个使用 XSLT 作为在 FXSL 的帮助下，函数式语言.FXSL 是一个实现对高阶函数的支持的库.

Here is a great site on using XSLT as a functional language with the help of FXSL. FXSL is a library that implements support for higher-order functions.

由于 FXSL，我认为 XSLT 本身不需要完全发挥功能.也许未来 FXSL 会被纳入 W3C 标准，但我没有证据证明这一点.

Because of FXSL I don't think that XSLT has a need to be fully functional itself. Perhaps FXSL will be included as a W3C standard in the future, but I have no evidence of this.

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