13 lines
436 B
Plaintext
13 lines
436 B
Plaintext
branch = _{ "{" ~ stmt* ~ expr? ~ "}" }
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stmt = _{ let_stmt }
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let_stmt = { "let" ~ identifier ~ "=" ~ expr ~ ";" }
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expr = { term ~ (binary_op ~ term)* }
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term = { val }
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val = _{ identifier | literal | "(" ~ expr ~ ")" }
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literal = _{ int }
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binary_op = { "+" }
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int = @{ "-"? ~ ASCII_DIGIT+ }
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identifier = @{ ("_" | ASCII_ALPHA) ~ ("_" | ASCII_ALPHANUMERIC)* }
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WHITESPACE = _{ " " | "\t" | NEWLINE }
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COMMENT = _{ "//" ~ (!NEWLINE ~ ANY)* }
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