2020-04-05 00:16:44 +00:00
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use nom::branch::alt;
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2020-04-05 00:37:35 +00:00
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use nom::bytes::complete::is_a;
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2020-04-05 00:16:44 +00:00
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use nom::bytes::complete::tag;
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use nom::bytes::complete::take_until;
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2020-04-05 02:45:56 +00:00
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use nom::character::complete::one_of;
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2020-04-05 00:16:44 +00:00
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use nom::combinator::map;
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2020-04-05 02:45:56 +00:00
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use nom::combinator::opt;
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2020-04-05 00:37:35 +00:00
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use nom::combinator::recognize;
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2020-04-05 01:30:56 +00:00
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use nom::combinator::rest;
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2020-04-05 00:16:44 +00:00
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use nom::combinator::value;
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2020-04-05 02:45:56 +00:00
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use nom::combinator::verify;
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2020-04-05 00:51:10 +00:00
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use nom::multi::many0;
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2020-04-05 03:42:27 +00:00
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use nom::multi::many1;
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2020-04-05 00:37:35 +00:00
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use nom::multi::separated_list;
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2020-04-05 00:16:44 +00:00
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use nom::sequence::delimited;
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2020-04-05 00:51:10 +00:00
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use nom::sequence::preceded;
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2020-04-05 00:37:35 +00:00
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use nom::sequence::tuple;
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2020-04-05 00:16:44 +00:00
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use nom::IResult;
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2020-04-05 03:42:27 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 00:16:44 +00:00
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enum DustTag<'a> {
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DTSpecial(Special),
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DTComment(Comment<'a>),
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2020-04-05 00:37:35 +00:00
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DTReference(Reference<'a>),
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2020-04-05 21:05:22 +00:00
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DTSection(Container<'a>),
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DTExists(Container<'a>),
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DTNotExists(Container<'a>),
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2020-04-05 00:16:44 +00:00
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}
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2020-04-05 02:45:56 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 00:16:44 +00:00
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enum Special {
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Space,
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NewLine,
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CarriageReturn,
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LeftCurlyBrace,
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RightCurlyBrace,
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}
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2020-04-05 02:45:56 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 00:16:44 +00:00
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struct Comment<'a> {
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value: &'a str,
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}
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2020-04-05 02:45:56 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 00:37:35 +00:00
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struct Path<'a> {
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keys: Vec<&'a str>,
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}
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2020-04-05 02:45:56 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 00:37:35 +00:00
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struct Reference<'a> {
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path: Path<'a>,
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2020-04-05 00:51:10 +00:00
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filters: Vec<Filter>,
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}
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2020-04-05 02:45:56 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 00:51:10 +00:00
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enum Filter {
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HtmlEncode,
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DisableHtmlEncode,
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JavascriptStringEncode,
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EncodeUri,
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EncodeUriComponent,
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JsonStringify,
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JsonParse,
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2020-04-05 00:37:35 +00:00
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}
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2020-04-05 02:45:56 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 01:30:56 +00:00
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struct Span<'a> {
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contents: &'a str,
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}
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2020-04-05 03:42:27 +00:00
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 21:05:22 +00:00
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struct Container<'a> {
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2020-04-05 03:42:27 +00:00
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path: Path<'a>,
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contents: Option<Block<'a>>,
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2020-04-05 21:24:13 +00:00
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else_contents: Option<Block<'a>>,
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2020-04-05 03:42:27 +00:00
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}
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#[derive(Clone, Debug, PartialEq)]
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struct Block<'a> {
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2020-04-05 01:30:56 +00:00
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elements: Vec<TemplateElement<'a>>,
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}
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2020-04-05 02:52:14 +00:00
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#[derive(Clone, Debug)]
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2020-04-05 03:42:27 +00:00
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pub struct Template<'a> {
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contents: Block<'a>,
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}
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#[derive(Clone, Debug, PartialEq)]
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2020-04-05 01:30:56 +00:00
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enum TemplateElement<'a> {
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TESpan(Span<'a>),
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TETag(DustTag<'a>),
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}
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2020-04-05 00:16:44 +00:00
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fn dust_tag(i: &str) -> IResult<&str, DustTag> {
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alt((
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map(special, DustTag::DTSpecial),
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map(comment, DustTag::DTComment),
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2020-04-05 00:37:35 +00:00
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map(reference, DustTag::DTReference),
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2020-04-05 21:05:22 +00:00
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container("{#", DustTag::DTSection),
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container("{?", DustTag::DTExists),
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container("{^", DustTag::DTNotExists),
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2020-04-05 00:16:44 +00:00
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))(i)
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}
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fn special(i: &str) -> IResult<&str, Special> {
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delimited(
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tag("{~"),
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alt((
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2020-04-05 02:45:56 +00:00
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value(Special::LeftCurlyBrace, tag("lb")),
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value(Special::RightCurlyBrace, tag("rb")),
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2020-04-05 00:16:44 +00:00
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value(Special::Space, tag("s")),
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value(Special::NewLine, tag("n")),
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value(Special::CarriageReturn, tag("r")),
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2020-04-05 00:16:44 +00:00
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)),
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tag("}"),
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)(i)
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}
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fn comment(i: &str) -> IResult<&str, Comment> {
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map(delimited(tag("{!"), take_until("!}"), tag("!}")), |body| {
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Comment { value: body }
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})(i)
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}
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2020-04-05 00:37:35 +00:00
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fn path(i: &str) -> IResult<&str, Path> {
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map(
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separated_list(
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tag("."),
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recognize(tuple((
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2020-04-05 02:45:56 +00:00
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one_of("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$"),
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opt(is_a(
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$0123456789-",
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)),
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2020-04-05 00:37:35 +00:00
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))),
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),
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|body| Path { keys: body },
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)(i)
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}
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fn reference(i: &str) -> IResult<&str, Reference> {
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2020-04-05 00:51:10 +00:00
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let (remaining, (p, filters)) = delimited(tag("{"), tuple((path, many0(filter))), tag("}"))(i)?;
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Ok((
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remaining,
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Reference {
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path: p,
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filters: filters,
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},
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))
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}
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2020-04-05 20:53:15 +00:00
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fn container<'a, F>(
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open_matcher: &'static str,
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2020-04-05 21:05:22 +00:00
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constructor: F,
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2020-04-05 20:53:15 +00:00
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) -> impl Fn(&'a str) -> IResult<&'a str, DustTag<'a>>
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2020-04-05 21:12:48 +00:00
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where
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F: Copy + Fn(Container<'a>) -> DustTag<'a>,
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{
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alt((
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container_with_body(open_matcher, constructor),
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self_closing_container(open_matcher, constructor),
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))
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}
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fn container_with_body<'a, F>(
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open_matcher: &'static str,
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constructor: F,
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) -> impl Fn(&'a str) -> IResult<&'a str, DustTag<'a>>
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2020-04-05 20:53:15 +00:00
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where
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2020-04-05 21:05:22 +00:00
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F: Fn(Container<'a>) -> DustTag<'a>,
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2020-04-05 20:53:15 +00:00
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{
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move |i: &'a str| {
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2020-04-05 21:24:13 +00:00
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let (i, (opening_name, inner, maybe_else, _closing_name)) = verify(
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2020-04-05 20:53:15 +00:00
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tuple((
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delimited(tag(open_matcher), path, tag("}")),
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opt(block),
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2020-04-05 21:24:13 +00:00
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opt(preceded(tag("{:else}"), opt(block))),
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2020-04-05 20:53:15 +00:00
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delimited(tag("{/"), path, tag("}")),
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)),
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2020-04-05 21:24:13 +00:00
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|(open, _inn, _maybe_else, close)| open == close,
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2020-04-05 20:53:15 +00:00
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)(i)?;
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2020-04-05 21:05:22 +00:00
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Ok((
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i,
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constructor(Container {
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path: opening_name,
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contents: inner,
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2020-04-05 21:24:13 +00:00
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else_contents: maybe_else.flatten(),
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2020-04-05 21:05:22 +00:00
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}),
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))
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2020-04-05 20:53:15 +00:00
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}
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}
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2020-04-05 21:12:48 +00:00
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fn self_closing_container<'a, F>(
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open_matcher: &'static str,
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constructor: F,
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) -> impl Fn(&'a str) -> IResult<&'a str, DustTag<'a>>
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where
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F: Fn(Container<'a>) -> DustTag<'a>,
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{
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move |i: &'a str| {
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let (i, path) = delimited(tag(open_matcher), path, tag("/}"))(i)?;
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Ok((
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i,
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constructor(Container {
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path: path,
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contents: None,
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2020-04-05 21:24:13 +00:00
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else_contents: None,
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2020-04-05 21:12:48 +00:00
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}),
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))
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}
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}
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2020-04-05 00:51:10 +00:00
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fn filter(i: &str) -> IResult<&str, Filter> {
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preceded(
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tag("|"),
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alt((
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value(Filter::JsonStringify, tag("js")),
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value(Filter::JsonParse, tag("jp")),
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value(Filter::EncodeUriComponent, tag("uc")),
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value(Filter::HtmlEncode, tag("h")),
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value(Filter::DisableHtmlEncode, tag("s")),
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value(Filter::JavascriptStringEncode, tag("j")),
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value(Filter::EncodeUri, tag("u")),
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)),
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)(i)
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2020-04-05 00:37:35 +00:00
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}
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2020-04-05 01:30:56 +00:00
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/// Any text that is not a Dust element
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fn span(i: &str) -> IResult<&str, Span> {
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2020-04-05 02:45:56 +00:00
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let (remaining, body) = verify(alt((take_until("{"), rest)), |s: &str| s.len() > 0)(i)?;
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2020-04-05 01:30:56 +00:00
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Ok((remaining, Span { contents: body }))
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}
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2020-04-05 03:42:27 +00:00
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fn block(i: &str) -> IResult<&str, Block> {
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let (remaining, template_elements) = many1(alt((
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2020-04-05 01:30:56 +00:00
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map(span, TemplateElement::TESpan),
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map(dust_tag, TemplateElement::TETag),
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)))(i)?;
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Ok((
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remaining,
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2020-04-05 03:42:27 +00:00
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Block {
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2020-04-05 01:30:56 +00:00
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elements: template_elements,
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},
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))
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}
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2020-04-05 02:45:56 +00:00
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2020-04-05 03:42:27 +00:00
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pub fn template(i: &str) -> IResult<&str, Template> {
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let (remaining, contents) = block(i)?;
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Ok((remaining, Template { contents: contents }))
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}
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2020-04-05 02:45:56 +00:00
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#[cfg(test)]
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mod tests {
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use super::*;
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use nom::bytes::complete::is_a;
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use nom::error::ErrorKind;
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use nom::Err::Error;
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#[test]
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fn test_reference() {
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assert_eq!(
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super::reference("{foo.bar.baz|js|s}"),
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Ok((
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"",
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Reference {
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path: Path {
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keys: vec!["foo", "bar", "baz"]
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},
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filters: vec![Filter::JsonStringify, Filter::DisableHtmlEncode],
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}
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))
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);
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}
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#[test]
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fn test_path() {
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assert_eq!(
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is_a::<_, _, (_, ErrorKind)>("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$")(
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"foo"
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),
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Ok(("", "foo"))
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);
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assert_eq!(
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super::path("foo.bar.baz"),
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Ok((
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"",
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Path {
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keys: vec!["foo", "bar", "baz"]
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}
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))
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);
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}
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#[test]
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fn test_special() {
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assert_eq!(super::special("{~s}"), Ok(("", Special::Space)));
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assert_eq!(super::special("{~n}"), Ok(("", Special::NewLine)));
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assert_eq!(super::special("{~r}"), Ok(("", Special::CarriageReturn)));
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assert_eq!(super::special("{~lb}"), Ok(("", Special::LeftCurlyBrace)));
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assert_eq!(super::special("{~rb}"), Ok(("", Special::RightCurlyBrace)));
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assert_eq!(
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super::special("{~zzz}"),
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Err(Error(("zzz}", ErrorKind::Tag)))
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);
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}
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#[test]
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fn test_comment() {
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assert_eq!(
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super::comment("{! yo dawg} this is a comment !}"),
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Ok((
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"",
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Comment {
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value: " yo dawg} this is a comment "
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}
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))
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);
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assert_eq!(
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super::special("{! this is a comment without a close"),
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Err(Error((
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"{! this is a comment without a close",
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ErrorKind::Tag
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)))
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);
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|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_span() {
|
|
|
|
assert_eq!(
|
|
|
|
super::span("this is just some text"),
|
|
|
|
Ok((
|
|
|
|
"",
|
|
|
|
Span {
|
|
|
|
contents: "this is just some text"
|
|
|
|
}
|
|
|
|
))
|
|
|
|
);
|
|
|
|
assert_eq!(
|
|
|
|
super::span("this is just some text {~lb}"),
|
|
|
|
Ok((
|
|
|
|
"{~lb}",
|
|
|
|
Span {
|
|
|
|
contents: "this is just some text "
|
|
|
|
}
|
|
|
|
))
|
|
|
|
);
|
|
|
|
assert_eq!(
|
|
|
|
super::span("{~lb}"),
|
|
|
|
Err(Error(("{~lb}", ErrorKind::Verify)))
|
|
|
|
);
|
|
|
|
}
|
2020-04-05 03:42:27 +00:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_section_mismatched_paths() {
|
|
|
|
assert_eq!(
|
2020-04-05 21:05:22 +00:00
|
|
|
super::dust_tag("{#foo.bar}{/baz}"),
|
|
|
|
Err(Error(("{#foo.bar}{/baz}", ErrorKind::Tag)))
|
2020-04-05 03:42:27 +00:00
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_empty_section() {
|
|
|
|
assert_eq!(
|
2020-04-05 21:05:22 +00:00
|
|
|
super::dust_tag("{#foo.bar}{/foo.bar}"),
|
2020-04-05 03:42:27 +00:00
|
|
|
Ok((
|
|
|
|
"",
|
2020-04-05 21:05:22 +00:00
|
|
|
DustTag::DTSection(Container {
|
2020-04-05 21:12:48 +00:00
|
|
|
path: Path {
|
|
|
|
keys: vec!["foo", "bar"]
|
|
|
|
},
|
2020-04-05 21:24:13 +00:00
|
|
|
contents: None,
|
|
|
|
else_contents: None,
|
2020-04-05 21:12:48 +00:00
|
|
|
})
|
|
|
|
))
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_self_closing_section() {
|
|
|
|
assert_eq!(
|
|
|
|
super::dust_tag("{#foo.bar/}"),
|
|
|
|
Ok((
|
|
|
|
"",
|
|
|
|
DustTag::DTSection(Container {
|
2020-04-05 03:42:27 +00:00
|
|
|
path: Path {
|
|
|
|
keys: vec!["foo", "bar"]
|
|
|
|
},
|
2020-04-05 21:24:13 +00:00
|
|
|
contents: None,
|
|
|
|
else_contents: None,
|
2020-04-05 21:05:22 +00:00
|
|
|
})
|
2020-04-05 03:42:27 +00:00
|
|
|
))
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_section_with_body() {
|
|
|
|
assert_eq!(
|
2020-04-05 21:05:22 +00:00
|
|
|
super::dust_tag("{#foo.bar}hello {name}{/foo.bar}"),
|
2020-04-05 03:42:27 +00:00
|
|
|
Ok((
|
|
|
|
"",
|
2020-04-05 21:05:22 +00:00
|
|
|
DustTag::DTSection(Container {
|
2020-04-05 03:42:27 +00:00
|
|
|
path: Path {
|
|
|
|
keys: vec!["foo", "bar"]
|
|
|
|
},
|
|
|
|
contents: Some(Block {
|
|
|
|
elements: vec![
|
|
|
|
TemplateElement::TESpan(Span { contents: "hello " }),
|
|
|
|
TemplateElement::TETag(DustTag::DTReference(Reference {
|
|
|
|
path: Path { keys: vec!["name"] },
|
|
|
|
filters: Vec::new()
|
|
|
|
}))
|
|
|
|
]
|
2020-04-05 21:24:13 +00:00
|
|
|
}),
|
|
|
|
else_contents: None,
|
|
|
|
})
|
|
|
|
))
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_section_with_else_body() {
|
|
|
|
assert_eq!(
|
|
|
|
super::dust_tag("{#greeting}hello {name}{:else}goodbye {name}{/greeting}"),
|
|
|
|
Ok((
|
|
|
|
"",
|
|
|
|
DustTag::DTSection(Container {
|
|
|
|
path: Path {
|
|
|
|
keys: vec!["greeting"]
|
|
|
|
},
|
|
|
|
contents: Some(Block {
|
|
|
|
elements: vec![
|
|
|
|
TemplateElement::TESpan(Span { contents: "hello " }),
|
|
|
|
TemplateElement::TETag(DustTag::DTReference(Reference {
|
|
|
|
path: Path { keys: vec!["name"] },
|
|
|
|
filters: Vec::new()
|
|
|
|
}))
|
|
|
|
]
|
|
|
|
}),
|
|
|
|
else_contents: Some(Block {
|
|
|
|
elements: vec![
|
|
|
|
TemplateElement::TESpan(Span {
|
|
|
|
contents: "goodbye "
|
|
|
|
}),
|
|
|
|
TemplateElement::TETag(DustTag::DTReference(Reference {
|
|
|
|
path: Path { keys: vec!["name"] },
|
|
|
|
filters: Vec::new()
|
|
|
|
}))
|
|
|
|
]
|
|
|
|
}),
|
2020-04-05 21:05:22 +00:00
|
|
|
})
|
2020-04-05 03:42:27 +00:00
|
|
|
))
|
|
|
|
);
|
|
|
|
}
|
2020-04-05 02:45:56 +00:00
|
|
|
}
|