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33 lines
990 B
Plaintext
33 lines
990 B
Plaintext
file = { "hello world" }
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statement = { decl }
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decl = { "let" ~ #name = ident ~ #args = (ident)* ~ "=" ~ expr }
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expr = { infix_expr | call_expr | term }
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term = _{ ident | literal | "(" ~ expr ~ ")" }
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call_expr = {
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#name = ident ~ #args = (term)+
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}
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infix_expr = {
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#lhs = term ~ operator ~ #rhs = expr
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}
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operator = { "+" | "-" | "*" | "/" | "&&" | "||" | "<" | ">" | "==" | "!=" }
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ident = @{ ALPHABETIC ~ (ALPHABETIC | NUMBER | "_")* | quoted_indent }
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quoted_indent = _{ "`" ~ (!"`" ~ ANY)+ ~ "`" }
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literal = { string | number | boolean | char }
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string = { "\"" ~ (!"\"" ~ ANY)* ~ "\"" }
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char = { "'" ~ !"'" ~ ANY ~ "'" }
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number = _{ byte | float | integer }
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integer = @{ "-"? ~ ASCII_DIGIT+ }
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float = @{
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"-"? ~ (ASCII_DIGIT+ ~ "." ~ ASCII_DIGIT* | ASCII_DIGIT* ~ "." ~ ASCII_DIGIT+)
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}
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byte = @{ "0x" ~ ASCII_HEX_DIGIT{1, 2} | "0b" ~ ASCII_BIN_DIGIT{0, 8} }
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boolean = @{ "true" | "false" }
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WHITESPACE = _{ " " | "\t" | "\r" | "\n" }
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