add macro api

lib/philomena/images/query.ex

@@ -0,0 +1,8 @@
+defmodule Philomena.Images.Query do
+  use Philomena.Search.Lexer,
+    int_fields: ~W(id width height comment_count score upvotes downvotes faves uploader_id faved_by_id tag_count),
+    float_fields: ~W(aspect_ratio wilson_score),
+    date_fields: ~W(created_at updated_at first_seen_at),
+    literal_fields: ~W(namespaced_tags.name faved_by orig_sha512_hash sha512_hash uploader source_url original_format),
+    ngram_fields: ~W(description)
+end

lib/philomena/search/helpers.ex

@@ -13,4 +13,18 @@ defmodule Philomena.Search.Helpers do
         int_val
     end
   end
+
+  def full_choice(combinator \\ empty(), choices)
+
+  def full_choice(combinator, []) do
+    combinator |> eos()
+  end
+
+  def full_choice(combinator, [choice]) do
+    combinator |> concat(choice)
+  end
+
+  def full_choice(combinator, choices) do
+    choice(combinator, choices)
+  end
 end

lib/philomena/search/lexer.ex

@@ -1,4 +1,15 @@
 defmodule Philomena.Search.Lexer do
+  defmacro __using__(opts) do
+    literal_fields = Keyword.get(opts, :literal, [])
+    ngram_fields   = Keyword.get(opts, :ngram, [])
+    bool_fields    = Keyword.get(opts, :bool, [])
+    date_fields    = Keyword.get(opts, :date, [])
+    float_fields   = Keyword.get(opts, :float, [])
+    int_fields     = Keyword.get(opts, :int, [])
+    ip_fields      = Keyword.get(opts, :ip, [])
+    custom_fields  = Keyword.get(opts, :custom, [])
+
+    quote location: :keep do
       import NimbleParsec
       import Philomena.Search.Helpers
 
@@ -228,23 +239,62 @@ defmodule Philomena.Search.Lexer do
           relative_date
         ])
 
+      eq = choice([string(":"), string(".eq:")]) |> unwrap_and_tag(:eq)
+      lt = string(".lt:") |> unwrap_and_tag(:lt)
+      lte = string(".lte:") |> unwrap_and_tag(:lte)
+      gt = string(".gt:") |> unwrap_and_tag(:gt)
+      gte = string(".gte:") |> unwrap_and_tag(:gte)
+
+      range_relation =
+        choice([
+          eq,
+          lt,
+          lte,
+          gt,
+          gte
+        ])
+
       boost = ignore(string("^")) |> unwrap_and_tag(number, :boost)
       fuzz = ignore(string("~")) |> unwrap_and_tag(number, :fuzz)
 
       quot = string("\"")
 
-  quoted_term =
-    ignore(quot)
-    |> choice([
-      ignore(string("\\")) |> string("\""),
-      ignore(string("\\")) |> string("\\"),
-      string("\\") |> utf8_char([]),
-      utf8_char(not: ?")
+      bool_value =
+        full_choice(unquote(for f <- bool_fields, do: [string: f]))
+        |> concat(eq)
+        |> concat(bool)
+
+      date_value =
+        full_choice(unquote(for f <- date_fields, do: [string: f]))
+        |> concat(range_relation)
+        |> concat(date)
+
+      float_value =
+        full_choice(unquote(for f <- float_fields, do: [string: f]))
+        |> concat(range_relation)
+        |> concat(number)
+
+      int_value =
+        full_choice(unquote(for f <- int_fields, do: [string: f]))
+        |> concat(range_relation)
+        |> concat(int)
+
+      ip_value =
+        full_choice(unquote(for f <- ip_fields, do: [string: f]))
+        |> concat(eq)
+        |> concat(ip_address)
+
+      numeric =
+        choice([
+          bool_value,
+          date_value,
+          float_value,
+          int_value,
+          ip_value
         ])
-    |> times(min: 1)
-    |> ignore(quot)
-    |> reduce({List, :to_string, []})
-    |> unwrap_and_tag(:term)
+
+      quoted_numeric =
+        ignore(quot) |> concat(numeric) |> ignore(quot)
 
       stop_words =
         choice([
@@ -259,20 +309,93 @@ defmodule Philomena.Search.Lexer do
         ])
 
       defcombinatorp(
-    :simple_term,
+        :text,
         lookahead_not(stop_words)
         |> choice([
           string("\\") |> utf8_char([]),
-      string("(") |> parsec(:simple_term) |> string(")"),
+          string("(") |> parsec(:text) |> string(")"),
           utf8_char([])
         ])
         |> times(min: 1)
+        |> reduce({List, :to_string, []})
+        |> unwrap_and_tag(:text)
       )
 
-  unquoted_term =
-    parsec(:simple_term)
+      text = parsec(:text)
+
+      quoted_text =
+        choice([
+          ignore(string("\\")) |> string("\""),
+          ignore(string("\\")) |> string("\\"),
+          string("\\") |> utf8_char([]),
+          utf8_char(not: ?")
+        ])
+        |> times(min: 1)
         |> reduce({List, :to_string, []})
-    |> unwrap_and_tag(:term)
+        |> unwrap_and_tag(:text)
+
+      literal =
+        full_choice(unquote(for f <- literal_fields, do: [string: f]))
+        |> ignore(eq)
+        |> concat(text)
+        |> tag(:literal)
+
+      ngram =
+        full_choice(unquote(for f <- ngram_fields, do: [string: f]))
+        |> ignore(eq)
+        |> concat(text)
+        |> tag(:ngram)
+
+      custom =
+        full_choice(unquote(for f <- custom_fields, do: [string: f]))
+        |> ignore(string(":"))
+        |> concat(text)
+
+      quoted_literal =
+        ignore(quot)
+        |> full_choice(unquote(for f <- literal_fields, do: [string: f]))
+        |> ignore(eq)
+        |> concat(quoted_text)
+        |> ignore(quot)
+        |> tag(:literal)
+
+      quoted_ngram =
+        ignore(quot)
+        |> full_choice(unquote(for f <- ngram_fields, do: [string: f]))
+        |> ignore(eq)
+        |> concat(quoted_text)
+        |> ignore(quot)
+        |> tag(:ngram)
+
+      quoted_custom =
+        ignore(quot)
+        |> full_choice(unquote(for f <- custom_fields, do: [string: f]))
+        |> ignore(string(":"))
+        |> concat(quoted_text)
+        |> ignore(quot)
+        |> tag(:custom)
+
+      default =
+        text
+        |> tag(:default)
+
+      quoted_default =
+        quoted_text
+        |> tag(:default)
+
+      term =
+        choice([
+          quoted_numeric,
+          quoted_literal,
+          quoted_ngram,
+          quoted_custom,
+          quoted_default,
+          numeric,
+          literal,
+          ngram,
+          custom,
+          default
+        ])
 
       outer =
         choice([
@@ -284,8 +407,7 @@ defmodule Philomena.Search.Lexer do
           boost,
           fuzz,
           space,
-      quoted_term,
-      unquoted_term
+          term
         ])
 
       search =
@@ -293,4 +415,6 @@ defmodule Philomena.Search.Lexer do
         |> eos()
 
       defparsec(:search, search)
+    end
+  end
 end