rexafs 0.2.3

Rust-powered X-ray absorption spectroscopy analysis and EXAFS fitting
Documentation 
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WHITESPACE = _{ " " | "\t" | "\r" | "\n" }

complete_expression = { SOI ~ expression ~ EOI }
expression = { sum }
sum = { product ~ (add_op ~ product)* }
add_op = { "+" | "-" }

product = { power ~ (mul_op ~ power)* }
mul_op = { "*" | "/" }

power = { unary ~ (pow_op ~ power)? }
pow_op = { "^" }

unary = { sign* ~ primary }
sign = { "+" | "-" }

primary = { function_call | constant | identifier | number | "(" ~ expression ~ ")" }
function_call = { identifier ~ "(" ~ expr_list? ~ ")" }
expr_list = { expression ~ ("," ~ expression)* }

constant = @{ ("pi" | "e") ~ !(ASCII_ALPHANUMERIC | "_") }
identifier = @{ (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_")* }
number = @{ (ASCII_DIGIT+ ~ ("." ~ ASCII_DIGIT*)? | "." ~ ASCII_DIGIT+) ~ (("e" | "E") ~ ("+" | "-")? ~ ASCII_DIGIT+)? }