flow_rs/src/def.pest at master · ipost/flow_rs · GitHub

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WHITESPACE = _{ " " | "\t" | "\n" | "\r" }

all = { SOI ~ process ~ EOI }

process = { (if_branch | while_loop | step | WHITESPACE)+ }

if_branch = ${ "if" ~ WHITESPACE+ ~ condition ~ WHITESPACE* ~ "{" ~ WHITESPACE* ~ process ~ WHITESPACE* ~ "}" ~ else_branch? }

else_branch = { WHITESPACE* ~ "else" ~ WHITESPACE* ~ "{" ~ WHITESPACE* ~ process ~ WHITESPACE* ~ "}" }

while_loop = ${ "while" ~ WHITESPACE+ ~ condition ~ WHITESPACE* ~ "{" ~ WHITESPACE* ~ process ~ WHITESPACE* ~ "}" }

condition = { expression }

step = { exit ~ terminator | expression ~ terminator }
exit = { "exit" }
expression = ${ nw_char ~ (nw_char | WHITESPACE)* }
nw_char = _{ (ASCII_ALPHANUMERIC | "\"" | "'" | "." | "_" | "-" | "/" | "(" | ")" | "=") }
terminator = _{ ";" }