funki_lang 0.1.2

A customisable embeddable functional langauge.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

// Struct for iterating
struct EscapedString<'a> {
  s: std::str::Chars<'a>,
}

// Iterates over an escaped string and removes escapes
// This code is based off code from:
// https://stackoverflow.com/questions/58551211/how-do-i-interpret-escaped-characters-in-a-string
impl<'a> Iterator for EscapedString<'a> {
  type Item = Result<char, String>;

  fn next(&mut self) -> Option<Self::Item> {
    self.s.next().map(|c| match c {
      '\\' => match self.s.next() {
        None => Err("Escape char at end of str.".to_string()),
        Some('n') => Ok('\n'),
        Some('\\') => Ok('\\'),
        Some('{') => Ok('{'),
        Some('}') => Ok('}'),
        Some('"') => Ok('"'),
        Some(c) => Err(format!("Unknown escape char `{}`", c)),
      },
      c => Ok(c),
    })
  }
}

// Processes a string and returns a Result with a String if everything is fine,
// Otherwise returns an InterpretError
pub fn process_string(str: &str) -> Result<String, String> {
  let s = EscapedString { s: str.chars() };
  s.collect()
}