Reconsider the API of ErrorHighlight.spot

Author: mame

lib/error_highlight/base.rb

@@ -4,10 +4,9 @@ module ErrorHighlight
   # Identify the code fragment that seems associated with a given error
   #
   # Arguments:
-  #  node: RubyVM::AbstractSyntaxTree::Node
-  #  point: :name | :args
+  #  node: RubyVM::AbstractSyntaxTree::Node (script_lines should be enabled)
+  #  point_type: :name | :args
   #  name: The name associated with the NameError/NoMethodError
-  #  fetch: A block to fetch a specified code line (or lines)
   #
   # Returns:
   #  {
@@ -22,16 +21,18 @@ def self.spot(...)
   end
 
   class Spotter
-    def initialize(node, point, name: nil, &fetch)
+    def initialize(node, point_type: :name, name: nil)
       @node = node
-      @point = point
+      @point_type = point_type
       @name = name
 
       # Not-implemented-yet options
       @arg = nil # Specify the index or keyword at which argument caused the TypeError/ArgumentError
       @multiline = false # Allow multiline spot
 
-      @fetch = fetch
+      @fetch = -> (lineno, last_lineno = lineno) do
+        @node.script_lines[lineno - 1 .. last_lineno - 1].join("")
+      end
     end
 
     def spot
@@ -40,31 +41,31 @@ def spot
       case @node.type
 
       when :CALL, :QCALL
-        case @point
+        case @point_type
         when :name
           spot_call_for_name
         when :args
           spot_call_for_args
         end
 
       when :ATTRASGN
-        case @point
+        case @point_type
         when :name
           spot_attrasgn_for_name
         when :args
           spot_attrasgn_for_args
         end
 
       when :OPCALL
-        case @point
+        case @point_type
         when :name
           spot_opcall_for_name
         when :args
           spot_opcall_for_args
         end
 
       when :FCALL
-        case @point
+        case @point_type
         when :name
           spot_fcall_for_name
         when :args
@@ -75,15 +76,15 @@ def spot
         spot_vcall
 
       when :OP_ASGN1
-        case @point
+        case @point_type
         when :name
           spot_op_asgn1_for_name
         when :args
           spot_op_asgn1_for_args
         end
 
       when :OP_ASGN2
-        case @point
+        case @point_type
         when :name
           spot_op_asgn2_for_name
         when :args

lib/error_highlight/core_ext.rb

@@ -21,16 +21,13 @@ def to_s
 
         case self
         when NoMethodError, NameError
-          point = :name
+          opts[:point_type] = :name
           opts[:name] = name
         when TypeError, ArgumentError
-          point = :args
+          opts[:point_type] = :args
         end
 
-        spot = ErrorHighlight.spot(node, point, **opts) do |lineno, last_lineno|
-          last_lineno ||= lineno
-          node.script_lines[lineno - 1 .. last_lineno - 1].join("")
-        end
+        spot = ErrorHighlight.spot(node, **opts)
 
       rescue Errno::ENOENT
       end