atto/text

Functions for parsing over strings.

Values

match

pub fn match(
  regex: String,
) -> atto.Parser(String, String, String, c, e)

Parse a regex, returning the matched string. Zero-length matches will fail. Note that a literal backslash in the regex must be double-escaped, such as \\\\b to match the literal string \b rather than a word boundary. Note that zero-width matches can be dangerous, as they can cause infinite loops.

Examples

text.match("[0-9]+(\\.[0-9]*)?")
|> atto.run(text.new("123.456"), Nil)
|> atto.map(float.parse)
|> atto.map(result.unwrap(0.0))
// -> Ok(123.456)

new

</>

pub fn new(source: String) -> atto.ParserInput(String, String)

Create a new parser input from a string. Note: currently, this function lacks a JavaScript-specific implementation, so performance will be poor.