//
// Created by intellij-pest on 2021-04-25
// makefile
// Author: Till Wegmueller <till.wegmueller@openflowlabs.com>
//

WHITESPACE = _{ " " | "\t" }

comment_string = _{
    "#"
    ~ comment_character*
    ~ NEWLINE
}
comment_character = _{
    !NEWLINE        // if the following text is not three apostrophes
    ~ ANY         // then consume one character
}

variable_name_character = { UPPERCASE | ASCII_DIGIT | "_" }
variable_name = @{ variable_name_character* }
variable_value_character = {
    !NEWLINE
    ~ ANY
}
variable_value = @{ variable_value_character* }

variable_set = _{ "=" }
variable_add = _{ "+=" }

variable = { variable_name ~ ( variable_set | variable_add ) ~ variable_value? }

target_character = {
    !":"
    ~ ANY
}

target_name = { target_character+ }

target = { target_name ~ ":" ~ variable_value }

include = { "include" ~ variable_value }

define_keyword = _{"define"}
define_end_keyword = _{NEWLINE ~ "endef"}

define_value_character = {
    !define_end_keyword
    ~ ANY
}
define_value = @{ define_value_character* }

define = { define_keyword ~ variable_name ~ variable_set ~ NEWLINE ~ define_value ~ define_end_keyword }

makefile = { SOI ~ (NEWLINE | comment_string | define | variable | include | target )+ ~ EOI }