elastic_query 0.4.4

convert bool expression to elasticsearch DSL
Documentation 
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bool_expr = { SOI ~ expr ~ EOI }

expr = {
    (paren_bool | comp_expr) ~ ( (and_op|or_op)~ (paren_bool| comp_expr))*
}

and_op = { "and" }
or_op = { "or" }

paren_bool = { "(" ~ expr ~  ")" }

comp_expr = { field ~ op ~ value }

field = @{ (ASCII_ALPHA ~ ASCII_ALPHANUMERIC*) }
op = { eq | neq | op_in | op_not_in | gt | gte | lt | lte | like | not_like }
eq = { "=" }
neq = { "!=" | "<>"}
op_in = { "in" }
op_not_in= { "not" ~ "in"}
gt = { ">" }
gte = { ">=" }
lt = { "<" }
lte = { "<=" }
like = { "like" }
not_like = { "not" ~ "like" }

value = {
    string_literal
    | num_literal
    | "(" ~ string_literal ~("," ~ string_literal)* ~ ")"
    | "(" ~ num_literal ~("," ~ num_literal)* ~ ")"
}

num_literal = @{
    "-"?
    ~ ("0" | ASCII_NONZERO_DIGIT ~ ASCII_DIGIT*)
    ~ ("." ~ ASCII_DIGIT*)?
    ~ (^"e" ~ ("+" | "-")? ~ ASCII_DIGIT+)?
}

string_literal = ${ "\"" ~ string ~ "\"" }
string = @{ char* }
char = {
    !("\"" | "\\") ~ ANY
    | "\\" ~ ("\"" | "\\" | "/" | "b" | "f" | "n" | "r" | "t")
    | "\\" ~ ("u" ~ ASCII_HEX_DIGIT{4})
}

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