Trait shelp::LangInterface

pub trait LangInterface {
    pub fn print_line(stdout: &mut Stdout, line: &str) -> Result<()> { ... }
    pub fn get_indent(lines: &[String]) -> usize { ... }
}

LangInterface is a trait used by Repl to provide dependent specific features.

Implement only the functions which you want, since there are default implementations for all of them.

Provided methods

pub fn print_line(stdout: &mut Stdout, line: &str) -> Result<()>

Given a line of text, this function should print the line. This should be overridden if you want to lint the output in the repl.

pub fn get_indent(lines: &[String]) -> usize

Given the lines up to the place a new line is being added, this function should give the indentation of the new line.

For example, take the following [rust] code:

if true { // <------------- PRESSED ENTER HERE
}

Here the first two lines will be give: ['let a = 213;', 'if true {'], and the expected indent would be 4 such that the code would become:

if true {
    // CURSOR HERE
}

This is also used to detect if a new line should be added, or whether the command should be returned for execution. Take the following example:

if true { // <------------- PRESSED ENTER HERE

The indentation here would be 4 since its the start of the new block. So a new line will be added instead of returning all the lines for processing.

if true {
    // CURSOR HERE

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Implementors

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