trql 0.2.0

Query language for programmatically generating structures from trees.
Documentation 
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WHITESPACE = _{ " " }
numeric = _{ "-"? ~ ('0'..'9')+ }
literal = _{ ('a'..'z')+ }

from = ${ numeric }
to = ${ numeric }
step = ${ numeric }
index = ${ numeric }
range = { from? ~ ":" ~ to? ~ (":" ~ step)? }

descendants = { "…" }
children = { "." }
parallel = { "(" ~ select ~ ")" }
condition = { "[" ~ select ~ "]" }
token = ${ literal }
series = { (parallel | condition | range | index | descendants | children | token)* }
select = !{ series ~ ("," ~ series)* }

name = ${ literal }
query = ${ (name ~ WHITESPACE* ~ "=")? ~ WHITESPACE* ~ select ~ ("\n" ~ PEEK[..] ~ PUSH("  ") ~ query ~ DROP)* }
queries = _{ query ~ ("\n" ~ query)* }