cornfig 0.0.0-alpha

A simple and pain-free configuration language.
Documentation 
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WHITESPACE = _{ " " | "\t" | "\r" | "\n" }
COMMENT = _{ "//" ~ (!"\n" ~ ANY)* }

object = {
 "{" ~ pair* ~ "}"
}

array = {
  "[" ~ value* ~ "]"
}

pair = { path ~ "=" ~ value }

path = ${
    path_char+
    ~ ( "." ~ path_char+ )*
}

path_char = { ASCII_ALPHANUMERIC | "_" }

value = _{ object | array | variable | string | float | integer | boolean | null }

boolean = { "true" | "false" }
null = { "null" }

string = ${
  "\"" ~ char* ~ "\"" |
  "'" ~ char* ~ "'"
}

string_with_length = ${
  "\"" ~ char+ ~ "\"" |
  "'" ~ char+ ~ "'"
}

char = {
    variable
    | !("\"" | "\\") ~ ANY
    | "\\" ~ ("\"" | "\\" | "/" | "b" | "f" | "n" | "r" | "t")
    | "\\" ~ ("u" ~ ASCII_HEX_DIGIT{4})
}

integer = @{
  "-"?
  ~ ("0" | ASCII_NONZERO_DIGIT ~ ASCII_DIGIT*)
}

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

variable = ${ "$" ~ (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_")+ }

assignment = { variable ~ "=" ~ value }

assign_block = { "let" ~ "{" ~ assignment* ~ "}" ~ "in" }

config = _{ SOI ~ assign_block? ~ object ~ EOI }