chatter-macros 0.1.0

Proc macro for parsing chatter
Documentation 
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chatter = _{ SOI ~ newline* ~ (content ~ newline+)* ~ content? ~ newline* ~ EOI }

content = _{ goto | choices | branch | line }

line = { tags? ~ text ~ goto? }

choices = { (choice ~ newline)* ~ choice }
choice = { "-" ~ tags? ~ text ~ goto? }

goto = { "->" ~ branch_label }
branch = {"#" ~ branch_label }
branch_label = @{ (ASCII_ALPHANUMERIC | "_")+ }

tags = ${ "[" ~ (tag ~ tag_separator*)* ~ "]" }
tag = { (ASCII_ALPHANUMERIC | "_")+ }
tag_separator = _{ "," | WHITESPACE }

text = @{ first_char ~ char* }
first_char = {!("-" | "#" | newline) ~ ANY}
char = {!(" ->" | "->" | newline) ~ ANY}

newline = _{"\n"}

WHITESPACE = _{ " " | "\t" }
COMMENT = _{ "/*" ~ (!"*/" ~ ANY)* ~ "*/" }