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wildcard support

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This commit is contained in:
Liam P. White 2019-08-26 19:11:26 -04:00
parent a2638288a3
commit 675a7de13b
1 changed files with 41 additions and 2 deletions
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43
lib/philomena/search/parser.ex
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@ -156,16 +156,55 @@ defmodule Philomena.Search.Parser do
{%{range: %{field => %{gte: lower, lte: higher}}}, r_tokens}
[{:ngram_field, field}, {:eq, _}, {:text, value} | r_tokens] ->
{%{match: %{field => value}}, r_tokens}
value = process_term(value)
if contains_wildcard?(value) do
{%{wildcard: %{field => unescape_wildcard(value)}}, r_tokens}
else
{%{match: %{field => unescape_regular(value)}}, r_tokens}
end
[{:literal_field, field}, {:eq, _}, {:text, value} | r_tokens] ->
value = process_term(value)
if contains_wildcard?(value) do
{%{wildcard: %{field => unescape_wildcard(value)}}, r_tokens}
else
{%{term: %{field => unescape_regular(value)}}, r_tokens}
end
[{_field_type, field}, {:eq, _}, {_value_type, value} | r_tokens] ->
{%{term: %{field => value}}, r_tokens}
[{:default, [text: value]} | r_tokens] ->
{%{term: %{ctx[:default_field] => value}}, r_tokens}
value = process_term(value)
if contains_wildcard?(value) do
{%{wildcard: %{ctx[:default_field] => unescape_wildcard(value)}}, r_tokens}
else
{%{term: %{ctx[:default_field] => unescape_regular(value)}}, r_tokens}
end
_ ->
raise ArgumentError, "Expected a term"
end
end
defp contains_wildcard?(value) do
String.match?(value, ~r/(?<!\\)(?:\\\\)*[\*\?]/)
end
defp unescape_wildcard(value) do
# '*' and '?' are wildcard characters in the right context;
# don't unescape them.
Regex.replace(~r/(?<!\\)(?:\\)*([^\\\*\?])/, value, "\\1")
end
defp unescape_regular(value) do
Regex.replace(~r/(?<!\\)(?:\\)*(.)/, value, "\\1")
end
defp process_term(term) do
term |> String.trim() |> String.downcase()
end
end