lazy-template 0.2.0

String template library that send queries to function responder and interpolate the responses
Documentation 
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#![cfg(feature = "std")]
use core::convert::Infallible;
use lazy_template::{
    enclosed::{self, simple_escape, Parser, SimpleEscapeParser, SimpleQuery, SimpleQueryParser},
    IntoTemplateSystem, TemplateApplicationError,
};
use pretty_assertions::assert_eq;

#[test]
fn make_special_characters() {
    let actual = Parser::curly_braces()
        .with_escape_parser(SimpleEscapeParser)
        .with_query_parser(SimpleQueryParser)
        .into_template_system::<SimpleQuery>()
        .lazy_parse(r"special characters: \\, \0, \b, \e, \n, \r, \t")
        .to_string(Ok::<&str, Infallible>)
        .unwrap();
    dbg!(&actual);
    let expected = "special characters: \\, \0, \u{8}, \u{1b}, \n, \r, \t";
    dbg!(expected);
    assert_eq!(actual, expected);
}

#[test]
fn escape_curly_braces() {
    let map = |query| match query {
        "foo" => Ok(123),
        "bar" => Ok(456),
        other => Err(format!("{other} is undefined")),
    };
    let actual = Parser::curly_braces()
        .with_escape_parser(SimpleEscapeParser)
        .with_query_parser(SimpleQueryParser)
        .into_template_system::<SimpleQuery>()
        .lazy_parse(r"\{foo\} is {foo}, \{bar\} is {bar}")
        .to_string(map)
        .unwrap();
    dbg!(&actual);
    let expected = "{foo} is 123, {bar} is 456";
    dbg!(expected);
    assert_eq!(actual, expected);
}

#[test]
fn reject_invalid_escapes() {
    let map = |query| match query {
        "foo" => Ok(123),
        "bar" => Ok(456),
        other => Err(format!("{other} is undefined")),
    };
    let error = Parser::curly_braces()
        .with_escape_parser(SimpleEscapeParser)
        .with_query_parser(SimpleQueryParser)
        .into_template_system::<SimpleQuery>()
        .lazy_parse(r"foo {foo} b\ar {bar}")
        .to_string(map)
        .unwrap_err();
    dbg!(&error);
    let expected_message = "Failed to escape: Unsupported escape code 'a'";
    assert_eq!(error.to_string(), expected_message);
    assert!(matches!(
        error,
        TemplateApplicationError::Parse(enclosed::ParseError::ParseEscape(
            simple_escape::ParseError::UnsupportedEscapeCode('a'),
        )),
    ));
}

#[test]
fn reject_unexpected_end_of_input() {
    let map = |query| match query {
        "foo" => Ok(123),
        "bar" => Ok(456),
        other => Err(format!("{other} is undefined")),
    };
    let error = Parser::curly_braces()
        .with_escape_parser(SimpleEscapeParser)
        .with_query_parser(SimpleQueryParser)
        .into_template_system::<SimpleQuery>()
        .lazy_parse(r"foo {foo} bar {bar}\")
        .to_string(map)
        .unwrap_err();
    dbg!(&error);
    let expected_message = "Failed to escape: Unexpected end of input";
    assert_eq!(error.to_string(), expected_message);
    assert!(matches!(
        error,
        TemplateApplicationError::Parse(enclosed::ParseError::ParseEscape(
            simple_escape::ParseError::UnexpectedEndOfInput,
        )),
    ));
}