65 lines
1.8 KiB
Rust
65 lines
1.8 KiB
Rust
use crate::*;
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
#[parser]
|
|
pub(crate) fn conditional_statement(s: Span) -> IResult<Span, ConditionalStatement> {
|
|
let (s, a) = opt(unique_priority)(s)?;
|
|
let (s, b) = keyword("if")(s)?;
|
|
let (s, c) = paren(cond_predicate)(s)?;
|
|
let (s, d) = statement_or_null(s)?;
|
|
let (s, e) = many0(tuple((
|
|
keyword("else"),
|
|
keyword("if"),
|
|
paren(cond_predicate),
|
|
statement_or_null,
|
|
)))(s)?;
|
|
let (s, f) = opt(pair(keyword("else"), statement_or_null))(s)?;
|
|
|
|
Ok((
|
|
s,
|
|
ConditionalStatement {
|
|
nodes: (a, b, c, d, e, f),
|
|
},
|
|
))
|
|
}
|
|
|
|
#[parser]
|
|
pub(crate) fn unique_priority(s: Span) -> IResult<Span, UniquePriority> {
|
|
alt((
|
|
map(keyword("unique0"), |x| UniquePriority::Unique0(Box::new(x))),
|
|
map(keyword("unique"), |x| UniquePriority::Unique(Box::new(x))),
|
|
map(keyword("priority"), |x| {
|
|
UniquePriority::Priority(Box::new(x))
|
|
}),
|
|
))(s)
|
|
}
|
|
|
|
#[recursive_parser]
|
|
#[parser]
|
|
pub(crate) fn cond_predicate(s: Span) -> IResult<Span, CondPredicate> {
|
|
let (s, a) = list(symbol("&&&"), expression_or_cond_pattern)(s)?;
|
|
Ok((s, CondPredicate { nodes: (a,) }))
|
|
}
|
|
|
|
#[parser]
|
|
pub(crate) fn expression_or_cond_pattern(s: Span) -> IResult<Span, ExpressionOrCondPattern> {
|
|
alt((
|
|
map(expression, |x| {
|
|
ExpressionOrCondPattern::Expression(Box::new(x))
|
|
}),
|
|
map(cond_pattern, |x| {
|
|
ExpressionOrCondPattern::CondPattern(Box::new(x))
|
|
}),
|
|
))(s)
|
|
}
|
|
|
|
#[recursive_parser]
|
|
#[parser]
|
|
pub(crate) fn cond_pattern(s: Span) -> IResult<Span, CondPattern> {
|
|
let (s, a) = expression(s)?;
|
|
let (s, b) = keyword("matches")(s)?;
|
|
let (s, c) = pattern(s)?;
|
|
Ok((s, CondPattern { nodes: (a, b, c) }))
|
|
}
|