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use crate::ast::*;
pub use rules::*;
peg::parser! {
pub grammar rules() for str {
use OpBinary::*;
use OpUnary::*;
pub rule recipe() -> Recipe<'input>
= _ recipe:recipe_stmt()* { recipe }
pub rule recipe_stmt() -> RecipeStmt<'input>
= stmt:body_stmt() {
RecipeStmt::BodyStmt(stmt)
}
/ "fetch" __ name:ident() _ "{" _ body:body() _ "}" _ {
RecipeStmt::Fetch { name, body }
}
/ "task" __ name:ident() _ "(" _ args:argtypes() _ ")" _ "{" _ body:body() _ "}" _ {
RecipeStmt::Task { name, args, body }
}
pub rule body() -> Body<'input>
= recipe:body_stmt()* { recipe }
pub rule body_stmt() -> BodyStmt<'input>
= left:typed_expr() _ op:assign_op() _ right:expr() _ ";" _ {
BodyStmt::assign(left, op, right)
}
rule assign_op() -> Option<OpBinary>
= "+=" { Some(Add) }
/ "-=" { Some(Sub) }
/ "*=" { Some(Mul) }
/ "/=" { Some(Div) }
/ "%=" { Some(Rem) }
/ "=" { None }
rule typed_expr() -> TypedExpr<'input>
= expr:expr() typ:tagged(<_ ":" _>, <typ()>)? { TypedExpr { expr, typ } }
rule typ() -> Path<'input>
= path()
pub rule expr() -> Expr<'input> = precedence! {
left:(@) _ "||" _ right:@ { Expr::binary(left, Or, right) }
--
left:(@) _ "&&" _ right:@ { Expr::binary(left, And, right) }
--
left:(@) _ "==" _ right:@ { Expr::binary(left, Eq, right) }
left:(@) _ "!=" _ right:@ { Expr::binary(left, Ne, right) }
left:(@) _ "<" _ right:@ { Expr::binary(left, Lt, right) }
left:(@) _ ">" _ right:@ { Expr::binary(left, Gt, right) }
left:(@) _ "<=" _ right:@ { Expr::binary(left, Le, right) }
left:(@) _ ">=" _ right:@ { Expr::binary(left, Ge, right) }
--
left:(@) _ "+" _ right:@ { Expr::binary(left, Add, right) }
left:(@) _ "-" _ right:@ { Expr::binary(left, Sub, right) }
--
left:(@) _ "*" _ right:@ { Expr::binary(left, Mul, right) }
left:(@) _ "/" _ right:@ { Expr::binary(left, Div, right) }
left:(@) _ "%" _ right:@ { Expr::binary(left, Rem, right) }
--
"-" _ expr:@ { Expr::unary(Neg, expr) }
"!" _ expr:@ { Expr::unary(Not, expr) }
--
expr:@ _ "(" _ args:args() _ ")" { Expr::apply(expr, args) }
expr:@ _ "[" _ index:expr() _ "]" { Expr::index(expr, index) }
--
expr:@ _ "." _ field:field() { Expr::field(expr, field) }
--
"(" _ e:expr() _ ")" { Expr::paren(e) }
e:atom() { e }
}
rule atom() -> Expr<'input>
= lit:literal() { Expr::Literal(lit) }
/ path:path() { Expr::Path(path) }
rule args() -> Vec<Arg<'input>>
= args:delimited(<arg()>, <_ "," _>) { args }
rule arg() -> Arg<'input>
= expr:expr() { Arg { expr } }
rule argtypes() -> Vec<ArgType<'input>>
= args:delimited(<argtype()>, <_ "," _>) { args }
rule argtype() -> ArgType<'input>
= expr:typed_expr() { ArgType { expr } }
rule literal() -> Literal<'input>
= "true" { Literal::Boolean(true) }
/ "false" { Literal::Boolean(false) }
/ "0x" s:$((['0'..='9' | 'a'..='f' | 'A'..='F']+) ++ "_") { ?
Literal::integer(s, 16)
}
/ "0o" s:$((['0'..='7']+) ++ "_") { ?
Literal::integer(s, 8)
}
/ "0b" s:$((['0'..='1']+) ++ "_") { ?
Literal::integer(s, 2)
}
/ s:$((['0'..='9']+) ++ "_") { ?
Literal::integer(s, 10)
}
/ "\"" s:$(string_char()*) "\"" { Literal::String(s) }
/ "r\"" s:$([^'"']*) "\"" { Literal::RawString(s) }
/ "```" newline() s:$((!"```" [_])+) "```" { Literal::ScriptString(s) }
/ "(" _ ")" { Literal::Unit }
/ "(" _ elements:(expr() ** (_ "," _)) (_ ",")? _ ")" { Literal::Tuple(elements) }
/ "[" _ elements:delimited(<expr()>, <_ "," _>) _ "]" { Literal::Array(elements) }
/ "{" _ entries:delimited(<map_entry()>, <_ "," _>) _ "}" { Literal::Map(entries) }
rule map_entry() -> MapEntry<'input>
= left:typed_expr() _ "=" _ right:expr() {
MapEntry { left, right }
}
rule string_char()
= [^'"' | '\\']
/ "\\" [_]
rule path() -> Path<'input>
= components:ident() ++ (_ "::" _) { Path { components } }
rule field() -> Ident<'input>
= name:$(
['a'..='z' | 'A' ..='Z' | '0'..='9' | '_']*
) { Ident { name } }
rule ident() -> Ident<'input>
= name:$(
['a'..='z' | 'A' ..='Z' | '_' ]
['a'..='z' | 'A' ..='Z' | '0'..='9' | '_']*
) { Ident { name } }
/// Mandatory whitespace
rule __
= ([' ' | '\t'] / quiet!{newline()} / quiet!{comment()})+
/// Optional whitespace
rule _
= quiet!{__?}
rule comment()
= "//" (!newline() [_])* (newline() / ![_])
/ "/*" (!"*/" [_])* "*/"
rule newline()
= ['\n' | '\r']
rule delimited<T>(expr: rule<T>, delim: rule<()>) -> Vec<T>
= values:(expr() ++ delim()) delim()? { values }
/ { Vec::new() }
rule tagged<T>(tag: rule<()>, value: rule<T>) -> T
= tag() v:value() { v }
}
}
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