[libshumate] vector: Add explicit "get" expression

[Corentin Noël <corentinnoel src gnome org>]

commit d451a469ae65ea6574caf472cee0044e4059058c
Author: James Westman <james jwestman net>
Date:   Sat Jun 25 22:51:31 2022 -0500

    vector: Add explicit "get" expression

 shumate/vector/shumate-vector-expression-filter.c | 6 ++++++
 tests/vector-expression.c                         | 1 +
 2 files changed, 7 insertions(+)
---
diff --git a/shumate/vector/shumate-vector-expression-filter.c 
b/shumate/vector/shumate-vector-expression-filter.c
index d7a51ff..de64cbd 100644
--- a/shumate/vector/shumate-vector-expression-filter.c
+++ b/shumate/vector/shumate-vector-expression-filter.c
@@ -103,6 +103,12 @@ shumate_vector_expression_filter_from_json_array (JsonArray *array, GError **err
       expect_exprs = 1;
       lookup_first_arg = FALSE;
     }
+  else if (g_strcmp0 ("get", op) == 0)
+    {
+      self->type = EXPR_GET;
+      expect_exprs = 1;
+      lookup_first_arg = FALSE;
+    }
   else if (g_strcmp0 ("in", op) == 0)
     {
       self->type = EXPR_IN;
diff --git a/tests/vector-expression.c b/tests/vector-expression.c
index 1f319f5..2d2ae46 100644
--- a/tests/vector-expression.c
+++ b/tests/vector-expression.c
@@ -192,6 +192,7 @@ test_vector_expression_feature_filter (void)
   scope.feature = scope.layer->features[0];
 
   g_assert_true  (filter_with_scope (&scope, "[\"==\", \"name\", \"Hello, world!\"]"));
+  g_assert_true  (filter_with_scope (&scope, "[\"==\", [\"get\", \"name\"], \"Hello, world!\"]"));
   g_assert_false (filter_with_scope (&scope, "[\"==\", \"name\", \"Goodbye, world!\"]"));
   g_assert_true  (filter_with_scope (&scope, "[\"has\", \"name\"]"));
   g_assert_false (filter_with_scope (&scope, "[\"!has\", \"name\"]"));