philomena/lib/search/term_range_parser.ex
2019-11-02 17:02:46 -04:00

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1.4 KiB
Elixir

defmodule Search.TermRangeParser do
alias Search.LiteralParser
# Unfortunately, we can't use NimbleParsec here. It requires
# the compiler, and we're not in a macro environment.
def parse(input, fields, default_field) do
tokens =
Enum.find_value(fields, fn {f, p} ->
field(input, f, p)
end)
tokens || [{LiteralParser, default_field}, range: :eq, value: input]
end
defp field(input, field_name, field_parser) do
field_sz = byte_size(field_name)
case input do
<<^field_name::binary-size(field_sz), ":", value::binary>> ->
[{field_parser, field_name}, range: :eq, value: String.trim(value)]
<<^field_name::binary-size(field_sz), ".eq:", value::binary>> ->
[{field_parser, field_name}, range: :eq, value: String.trim(value)]
<<^field_name::binary-size(field_sz), ".gt:", value::binary>> ->
[{field_parser, field_name}, range: :gt, value: String.trim(value)]
<<^field_name::binary-size(field_sz), ".gte:", value::binary>> ->
[{field_parser, field_name}, range: :gte, value: String.trim(value)]
<<^field_name::binary-size(field_sz), ".lt:", value::binary>> ->
[{field_parser, field_name}, range: :lt, value: String.trim(value)]
<<^field_name::binary-size(field_sz), ".lte:", value::binary>> ->
[{field_parser, field_name}, range: :lte, value: String.trim(value)]
_ ->
nil
end
end
end