extends-rs 0.1.6

rust extends impl a macro attr
Documentation 
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WHITESPACE = _{" " | NEWLINE|zhushi}
zhushi = {"//"~ANY*}
char = @{ ASCII_ALPHANUMERIC }
derchar = @{ ASCII_ALPHANUMERIC |","|"_"}
usep = @{ASCII_ALPHANUMERIC|"::"|"{"|"}"|"," }
usep_content = {(("use"|"extern"~"crate")~usep*~";")?}
derivep = {("#[derive("~derchar+~")]")?}
structchar = @{ ASCII_ALPHANUMERIC|":"|"<"|">"|"," |"_"}
struct_content = {structchar+|char+}
struct_name = {char+}
struct_impl_name = {char+}
implchar = @{ ASCII_ALPHANUMERIC|"("|")"|";"|"!"|","|"\""|"#"|"_"|"-"|">"|"<" }
fnafor = {(fnbfor|fncfor|fndfor)}
fnbfor = {"{"~implchar*~fnafor~implchar*~"}"}
fncfor = {implchar*~"{"~implchar*~"}"~implchar*}
fndfor = {implchar*~"{"~fnafor*~"}"~implchar*}
structimpl_content = {
fnafor*
}

strcutstr = { derivep~ "pub"? ~ "struct" ~  struct_name ~"{"  ~ struct_content ~ "}" }
structimplstr = {"pub"? ~ "impl" ~  struct_impl_name ~"{"  ~ structimpl_content ~ "}"}
file = {
    SOI~
    usep_content~
    (strcutstr|structimplstr)*
    ~EOI
}