fix(references,definition): better references of symbols (#430)

Closes #342
Closes #184
Closes #304

Author: mhanberg

Diff for: lib/next_ls.ex

@@ -1351,6 +1351,7 @@ defmodule NextLS do
     FROM "symbols" sym
     WHERE sym.file = ?
       AND sym.line = ?
+      AND ? BETWEEN sym.column AND sym.end_column
     ORDER BY sym.id ASC
     LIMIT 1
     """
@@ -1365,7 +1366,7 @@ defmodule NextLS do
     LIMIT 1
     """
 
-    case DB.query(database, definition_query, [file, line]) do
+    case DB.query(database, definition_query, [file, line, col]) do
       [[module, "defmodule", _]] ->
         {:module, module}
 

Diff for: lib/next_ls/db.ex

@@ -108,10 +108,10 @@ defmodule NextLS.DB do
     __query__(
       {conn, s.logger},
       ~Q"""
-      INSERT INTO symbols (module, file, type, name, line, 'column', source)
-          VALUES (?, ?, ?, ?, ?, ?, ?);
+      INSERT INTO symbols (module, file, type, name, line, 'column', 'end_column', source)
+          VALUES (?, ?, ?, ?, ?, ?, ?, ?);
       """,
-      [mod, file, "defmodule", mod, module_line, 1, source]
+      [mod, file, "defmodule", mod, module_line, 1, String.length(Macro.to_string(mod)), source]
     )
 
     if struct do
@@ -120,19 +120,28 @@ defmodule NextLS.DB do
       __query__(
         {conn, s.logger},
         ~Q"""
-        INSERT INTO symbols (module, file, type, name, line, 'column', source)
-            VALUES (?, ?, ?, ?, ?, ?, ?);
+        INSERT INTO symbols (module, file, type, name, line, 'column', 'end_column', source)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?);
         """,
-        [mod, file, "defstruct", "%#{Macro.to_string(mod)}{}", meta[:line], 1, source]
+        [
+          mod,
+          file,
+          "defstruct",
+          "%#{Macro.to_string(mod)}{}",
+          meta[:line],
+          meta[:column] || 1,
+          meta[:column] || 1,
+          source
+        ]
       )
     end
 
     for {name, {:v1, type, _meta, clauses}} <- defs, {meta, params, _, _} <- clauses do
       __query__(
         {conn, s.logger},
         ~Q"""
-        INSERT INTO symbols (module, file, type, name, params, line, 'column', source)
-            VALUES (?, ?, ?, ?, ?, ?, ?, ?);
+        INSERT INTO symbols (module, file, type, name, params, line, 'column', end_column, source)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?);
         """,
         [
           mod,
@@ -142,6 +151,7 @@ defmodule NextLS.DB do
           :erlang.term_to_binary(params),
           meta[:line],
           meta[:column] || 1,
+          (meta[:column] || 1) + String.length(to_string(name)) - 1,
           source
         ]
       )
@@ -151,10 +161,10 @@ defmodule NextLS.DB do
       __query__(
         {conn, s.logger},
         ~Q"""
-        INSERT INTO symbols (module, file, type, name, line, 'column', source)
-            VALUES (?, ?, ?, ?, ?, ?, ?);
+        INSERT INTO symbols (module, file, type, name, line, 'column', 'end_column', source)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?);
         """,
-        [mod, file, type, name, line, column, source]
+        [mod, file, type, name, line, column, column + String.length(to_string(name)) - 1, source]
       )
     end
 

Diff for: lib/next_ls/db/schema.ex

@@ -23,7 +23,7 @@ defmodule NextLS.DB.Schema do
 
   alias NextLS.DB
 
-  @version 6
+  @version 7
 
   def init(conn) do
     # FIXME: this is odd tech debt. not a big deal but is confusing
@@ -83,6 +83,7 @@ defmodule NextLS.DB.Schema do
                 params blob,
                 line integer NOT NULL,
                 column integer NOT NULL,
+                end_column integer NOT NULL,
                 source text NOT NULL DEFAULT 'user',
                 inserted_at text NOT NULL DEFAULT CURRENT_TIMESTAMP
             );

Diff for: lib/next_ls/definition.ex

@@ -19,7 +19,12 @@ defmodule NextLS.Definition do
             AND ? <= refs.end_line
             AND refs.start_column <= ?
             AND ? <= refs.end_column
-        ORDER BY refs.id asc
+        ORDER BY 
+          (CASE refs.type
+             WHEN 'function' THEN 0
+             WHEN 'module' THEN 1
+             ELSE 2
+           END) asc
         LIMIT 1;
         """,
         [file, line, line, col, col]