Crate untwine

A declarative parsing library for extremely simple, concise parsing. See parser! for usage instructions.

Example JSON parser using Untwine:

untwine::parser! {
    [error = ParseJSONError]
    sep = #{char::is_ascii_whitespace}*;
    comma = sep "," sep;
    int: num=<"-"? '0'-'9'+> -> JSONValue { JSONValue::Int(num.parse()?) }
    float: num=<"-"? '0'-'9'+ "." '0'-'9'+> -> JSONValue { JSONValue::Float(num.parse()?) }
    str_char = ("\\" . | [^"\""]) -> char;
    str: "\"" chars=str_char* "\"" -> JSONValue { JSONValue::String(chars.into_iter().collect()) }
    null: "null" -> JSONValue { JSONValue::Null }
    bool: bool=<"true" | "false"> -> JSONValue { JSONValue::Bool(bool == "true") }
    list: "[" sep values=json$comma* sep "]" -> JSONValue { JSONValue::List(values) }
    map_entry: key=str sep ":" sep value=json -> (String, JSONValue) { (key.string().unwrap(), value) }
    map: "{" sep values=map_entry$comma* sep "}" -> JSONValue { JSONValue::Map(values.into_iter().collect()) }
    pub json = (bool | null | str | float | int | list | map) -> JSONValue;
}

Re-exports

• pub use error::ParserError;

Modules

• attr
• context
• error
• parser
• parsers
• prelude
• result

Macros

• parser
  Generate parsers using a series of declarative patterns and blocks evaluating their values.

Functions

• parse
  Parse a value with a parser function created by the parser! block.
• parse_pretty
  Parse a value with a parser function created by the parser! block, and convert the error to a pretty string if there is one.