lezer-ludus/ludus.grammar

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@top Script { terminator* line+ }
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@skip { space | comment }
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line { (expression | toplevel) terminator+ }
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toplevel { Import | Use | Ns }
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Import { silent<"import"> String silent<"as"> Word }
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Use { silent<"use"> Word }
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Ns {
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silent<"ns"> Word "{"
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separator*
assoc_term (separator+ assoc_term)*
separator*
"}"
}
expression { non_binding | binding }
binding { Let | Ref | Fn_Named | Fn_Compound }
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Ref { silent<"ref"> Word "=" expression }
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non_binding { simple | complex }
synth_root { Word | Keyword }
synth_term { Args | Keyword }
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arg_term { Placeholder | simple }
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Args {
("(" separator* ")")
| ("("
separator*
arg_term (separator+ arg_term)*
separator*
")")
}
Synthetic { synth_root synth_term+ }
complex {
Block
| If
| If_Let
| Match
| When
//| Do
//| Bind
| Loop
| Repeat
| Each
}
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Repeat { silent<"repeat"> (Word | Number) Block }
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Each { silent<"each"> simple "do" (Fn_Clause | Fn_Clauses) }
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Recur { silent<"recur"> Args }
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Loop { silent<"loop"> simple "with" (Fn_Clause | Fn_Clauses) }
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simple { atom | collection | Synthetic | Fn_Lambda | Recur }
Fn_Clause { Tuple_Pattern "->" non_binding }
Fn_Clauses {
"{"
terminator*
Fn_Clause (terminator+ Fn_Clause)*
terminator*
"}"
}
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Fn_Compound { silent<"fn"> Word Fn_Clauses }
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Fn_Named { silent<"fn"> Word Fn_Clause }
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Fn_Lambda { silent<"fn"> Fn_Clause }
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// TODO: figure out precedence with do/bind exprs
// do_expr { Fn_Lambda | Synthetic | Word | Keyword }
// Do {
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// silent<"do"> simple (~ambig newline* ">" do_expr)+
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// }
// Bind {
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// silent<"bind">
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// simple
// (!pipeline pipeline)+
// }
Pattern {
Tuple_Pattern
| List_Pattern
| Dict_Pattern
| Struct_Pattern
| atom
| Placeholder
}
Placeholder { "_" }
ellipsis { "..." }
Splattern { ellipsis (Word | Placeholder) }
Tuple_Pattern {
("(" separator* ")")
| ("("
separator*
(Pattern separator+)* (Pattern | Splattern)
separator*
")")
}
List_Pattern {
("[" separator* "]")
| ("["
separator*
(Pattern separator+)* (Pattern | Splattern)
separator*
"]")
}
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Assoc_Pattern { Word | (Keyword Pattern) }
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Dict_Pattern {
("#{" separator* "}")
| ("#{"
separator*
(Assoc_Pattern separator+)* (Assoc_Pattern | Splattern)
separator*
"}")
}
Struct_Pattern {
("@{" separator* "}")
| ("@{"
separator*
(Assoc_Pattern separator+)* (Assoc_Pattern | Splattern)
separator*
"}")
}
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Let { silent<"let"> Pattern "=" non_binding }
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Else { silent<"else"> }
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Match_Clause {(Pattern | Else) "->" newline* expression}
match_body {
Match_Clause
| (
"{"
terminator*
Match_Clause (terminator+ Match_Clause)*
terminator*
"}"
)
}
Match {
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silent<"match">
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simple
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silent<"with">
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match_body
}
When_Clause {
(simple | Placeholder | Else) "->" newline* expression
}
When {
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silent<"when"> "{"
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terminator*
When_Clause (terminator+ When_Clause)*
terminator*
"}"
}
If {
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silent<"if"> simple newline*
silent<"then"> expression newline*
silent<"else"> expression
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}
If_Let {
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silent<"if"> silent<"let">
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Pattern "=" simple newline*
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silent<"then"> expression newline*
silent<"else"> expression
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}
Block {
"{"
terminator*
expression (terminator+ expression)*
terminator*
"}"
}
collection {
Tuple
| List
| Set
| Dict
| Struct
}
Tuple {
( "(" // non-empty
separator*
non_binding (separator+ non_binding)*
separator*
")" )
| "(" separator* ")" // empty
}
Splat { ellipsis Word }
linear_term { Splat | non_binding }
List {
("["
separator*
linear_term (separator+ linear_term)*
separator*
"]" )
| "[" separator* "]"
}
Set {
("${"
separator*
linear_term (separator+ linear_term)*
separator*
"}")
| "${" separator* "}"
}
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assoc_term { Word | (Keyword non_binding) }
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dict_term { assoc_term | Splat }
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Dict {
("#{"
separator*
dict_term (separator+ dict_term)*
separator*
"}" )
| "#{" separator* "}"
}
Struct {
("@{"
separator*
assoc_term (separator+ assoc_term)*
separator*
"}")
| "@{" separator* "}"
}
atom { Boolean | Nil | String | Number | Keyword | Word }
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reserved<term> { @specialize[@name={term}]<Word, term> }
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silent<term> { @specialize<Word, term> }
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Keyword { ":" Word }
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Boolean { reserved<"true"> | reserved<"false"> }
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Nil { silent<"nil"> }
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@tokens {
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Word { $[a-z] $[a-zA-Z_\-?/!]* }
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space { $[ \t\r]+ }
comment { "&" ![\n]* }
String { '"' (!["\\] | "\\" _)* '"' }
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int { $[1-9]$[0-9]* | "0" }
float { ("0" | int ) "." $[0-9]+}
Number { "-"? (int | float) }
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separator { $[,\n] }
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terminator { $[;\n] | @eof }
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newline { "\n" }
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}