jens 0.6.0

Readable templates for code generation
Documentation 
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use crate::parser::{get_ident, parse_phase2, segment::Segment, Rule};
use pest::iterators::Pair;

#[derive(Debug, Default, PartialEq)]
pub struct Template {
    pub name: String,
    pub indent_ignored: usize,
    pub lines: Vec<TemplateLine>,
}

impl<'a> From<Pair<'a, Rule>> for Template {
    fn from(pair: Pair<'a, Rule>) -> Template {
        let mut template = Template::default();

        for item in pair.into_inner() {
            match item.as_rule() {
                Rule::template_content => template.lines.push(item.as_str().into()),
                Rule::template_decl => template.name = get_ident(item),
                Rule::template_line => template.lines.push(item.into()),
                Rule::template_terminator => {
                    template.indent_ignored = item.as_str().matches("-").count()
                }
                Rule::template_empty_line => template.lines.push(TemplateLine::default()),
                Rule::EOI => {}
                _ => unreachable!(),
            }
        }
        template
    }
}

impl Template {
    pub fn placeholder_names(&self) -> Vec<String> {
        let mut names = Vec::new();
        for line in &self.lines {
            for segment in &line.segments {
                match segment {
                    Segment::Placeholder(ref s) => {
                        if !names.contains(s) {
                            names.push(s.clone());
                        }
                    }
                    _ => {}
                }
            }
        }
        names
    }
}

#[derive(Debug, Default, PartialEq)]
pub struct TemplateLine {
    pub indentation: String,
    pub segments: Vec<Segment>,
}

impl From<&str> for TemplateLine {
    fn from(s: &str) -> TemplateLine {
        TemplateLine {
            indentation: "".into(),
            segments: parse_phase2(s).unwrap(),
        }
    }
}

impl<'a> From<Pair<'a, Rule>> for TemplateLine {
    fn from(pair: Pair<'a, Rule>) -> TemplateLine {
        let mut indentation = String::new();
        let mut segments = vec![];
        for item in pair.into_inner() {
            match item.as_rule() {
                Rule::significant_whitespace => indentation = item.as_str().into(),
                Rule::template_content => segments = parse_phase2(item.as_str()).unwrap(),
                _ => unreachable!(),
            }
        }
        TemplateLine {
            indentation,
            segments,
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::parser::parse;

    #[test]
    fn empty_template() {
        use insta::assert_debug_snapshot_matches;
        let templates = parse("main =\n----").unwrap();

        assert_debug_snapshot_matches!("template.empty_template", templates);
    }

    #[test]
    fn space_indented_content() {
        use insta::assert_debug_snapshot_matches;
        let templates = parse("main =\n    indent4\n     indent5\n----").unwrap();

        assert_debug_snapshot_matches!("template.indented_content", templates);
    }

    #[test]
    fn tab_indented() {
        use insta::assert_debug_snapshot_matches;
        let templates = parse("main =\n\tindent1\n\t\tindent2\n-").unwrap();

        assert_debug_snapshot_matches!("template.tab_indented", templates);
    }

    #[test]
    fn one_liner() {
        use insta::assert_debug_snapshot_matches;
        let templates =
            parse("main =      this is a one-liner and white space at the beginning is ignored")
                .unwrap();

        assert_debug_snapshot_matches!("template.one_liner", templates);
    }

    #[test]
    fn mixed_indentation() {
        use insta::assert_debug_snapshot_matches;
        let templates = parse("main =\n    \tindent\n----").unwrap();

        assert_debug_snapshot_matches!("template.mixed_indentation", templates);
    }

    #[test]
    fn ignore_more_indentation() {
        use insta::assert_debug_snapshot_matches;
        let templates = parse("main =\n  content\n----").unwrap();

        assert_debug_snapshot_matches!("template.ignore_more_indentation", templates);
    }

    #[test]
    fn ignore_inner_template() {
        use insta::assert_debug_snapshot_matches;
        let templates = parse("main =\n    main =\n        x\n    ----\n----").unwrap();

        assert_debug_snapshot_matches!("template.ignore_inner_template", templates);
    }

    #[test]
    fn invalid_start() {
        assert!(parse("main\n  content\n--").is_err())
    }

    #[test]
    fn invalid_end() {
        assert!(parse("main =\n content\n").is_err())
    }
}