如何在Rust中读取用户输入？ [英] How to read user input in Rust?

问题描述

编者注：这个问题是指在Rust 1.0之前的Rust部分，但是一般概念在Rust 1.0中仍然有效。

Editor's note: This question refers to parts of Rust that predate Rust 1.0, but the general concept is still valid in Rust 1.0.

我打算制作一个标记器。我需要读取用户键入的每一行，并在用户按下 ctrl - D 后停止阅读。

I intend to make a tokenizer. I need to read every line the user types and stop reading once the user presses ctrl-D.

I搜索过，只找到了关于Rust的一个例子 IO甚至没有编译。我查看了 io 模块的文档，发现 read_line（）函数是 ReaderUtil 接口，但 stdin（）返回 Reader 。

I searched around and only found one example on Rust IO which does not even compile. I looked at the io module's documentation and found that the read_line() function is part of the ReaderUtil interface, but stdin() returns a Reader instead.

我想要的代码在C ++中基本上如下所示

The code that I would like would essentially look like the following in C++

vector<string> readLines () {
    vector<string> allLines;
    string line;

    while (cin >> line) {
        allLines.push_back(line);
    }

    return allLines;
}

推荐答案

编者注：这个答案早于Rust 1.0。请参阅现代解决方案的其他答案。

Editor's note: This answer predates Rust 1.0. Please see the other answers for modern solutions.

在Rust 0.4中，使用 ReaderUtil trait访问 read_line 函数。请注意，您需要将值显式转换为特征类型，例如， reader as io :: ReaderUtil

In Rust 0.4, use the ReaderUtil trait to access the read_line function. Note that you need to explicitly cast the value to a trait type, eg, reader as io::ReaderUtil

fn main() {
        let mut allLines = ~[];
        let reader = io::stdin();

        while !reader.eof() {
                allLines.push((reader as io::ReaderUtil).read_line());
        }

        for allLines.each |line| {
                io::println(fmt!("%s", *line));
        }
}

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