Rewrite line modifications, hopefully with easier to comprehend code

1 files changed, 78 insertions, 0 deletions

diff --git a/src/unit_tests.cc b/src/unit_tests.cc
index 504c9246..ec9bb64c 100644
--- a/src/unit_tests.cc
+++ b/src/unit_tests.cc
@@ -3,6 +3,9 @@
 #include "keys.hh"
 #include "selectors.hh"
 #include "word_db.hh"
+#include "line_modification.hh"
+
+#include <tuple>
 
 using namespace Kakoune;
 
@@ -151,6 +154,80 @@ void test_keys()
     kak_assert(keys == parsed_keys);
 }
 
+bool operator==(const LineModification& lhs, const LineModification& rhs)
+{
+    return std::tie(lhs.old_line, lhs.new_line, lhs.num_removed, lhs.num_added) ==
+           std::tie(rhs.old_line, rhs.new_line, rhs.num_removed, rhs.num_added);
+}
+
+void test_line_modifications()
+{
+    {
+        Buffer buffer("test", Buffer::Flags::None, { "line 1\n"_ss, "line 2\n"_ss });
+        auto ts = buffer.timestamp();
+        buffer.erase(buffer.iterator_at({1, 0}), buffer.iterator_at({2, 0}));
+
+        auto modifs = compute_line_modifications(buffer, ts);
+        kak_assert(modifs.size() == 1 && modifs[0] == LineModification{ 1 COMMA 1 COMMA 1 COMMA 0 });
+    }
+
+    {
+        Buffer buffer("test", Buffer::Flags::None, { "line 1\n"_ss, "line 2\n"_ss });
+        auto ts = buffer.timestamp();
+        buffer.insert(buffer.iterator_at({1, 7}), "line 3");
+
+        auto modifs = compute_line_modifications(buffer, ts);
+        kak_assert(modifs.size() == 1 && modifs[0] == LineModification{ 2 COMMA 2 COMMA 0 COMMA 1 });
+    }
+
+    {
+        Buffer buffer("test", Buffer::Flags::None,
+                      { "line 1\n"_ss, "line 2\n"_ss, "line 3\n"_ss });
+
+        auto ts = buffer.timestamp();
+        buffer.insert(buffer.iterator_at({1, 4}), "hoho\nhehe");
+        buffer.erase(buffer.iterator_at({0, 0}), buffer.iterator_at({1, 0}));
+
+        auto modifs = compute_line_modifications(buffer, ts);
+        kak_assert(modifs.size() == 1 && modifs[0] == LineModification{ 0 COMMA 0 COMMA 2 COMMA 2 });
+    }
+
+    {
+        Buffer buffer("test", Buffer::Flags::None,
+                      { "line 1\n"_ss, "line 2\n"_ss, "line 3\n"_ss, "line 4\n"_ss });
+
+        WordDB word_db(buffer);
+        word_db.find_matching("", prefix_match);
+
+        auto ts = buffer.timestamp();
+        buffer.erase(buffer.iterator_at({0,0}), buffer.iterator_at({3,0}));
+        buffer.insert(buffer.iterator_at({1,0}), "newline 1\nnewline 2\nnewline 3\n");
+        buffer.erase(buffer.iterator_at({0,0}), buffer.iterator_at({1,0}));
+        {
+            auto modifs = compute_line_modifications(buffer, ts);
+            kak_assert(modifs.size() == 1 && modifs[0] == LineModification{ 0 COMMA 0 COMMA 4 COMMA 3 });
+        }
+        buffer.insert(buffer.iterator_at({3,0}), "newline 4\n");
+
+        {
+            auto modifs = compute_line_modifications(buffer, ts);
+            kak_assert(modifs.size() == 1 && modifs[0] == LineModification{ 0 COMMA 0 COMMA 4 COMMA 4 });
+        }
+
+        word_db.find_matching("", prefix_match);
+    }
+
+    {
+        Buffer buffer("test", Buffer::Flags::None, { "line 1\n"_ss });
+        auto ts = buffer.timestamp();
+        buffer.insert(buffer.iterator_at({0,0}), "n");
+        buffer.insert(buffer.iterator_at({0,1}), "e");
+        buffer.insert(buffer.iterator_at({0,2}), "w");
+        auto modifs = compute_line_modifications(buffer, ts);
+        kak_assert(modifs.size() == 1 && modifs[0] == LineModification{ 0 COMMA 0 COMMA 1 COMMA 1 });
+    }
+}
+
 void run_unit_tests()
 {
     test_utf8();
@@ -159,4 +236,5 @@ void run_unit_tests()
     test_buffer();
     test_undo_group_optimizer();
     test_word_db();
+    test_line_modifications();
 }