1 files changed, 57 insertions, 0 deletions
diff --git a/gen.rb b/gen.rb
new file mode 100644
index 0000000..4b02320
--- /dev/null
+++ b/gen.rb
@@ -0,0 +1,57 @@
+#!/usr/bin/env ruby
+
+require 'yaml'
+require 'erb'
+
+# load template data
+DATA = YAML.load_file(File.join(__dir__, 'ops.yaml'))
+
+switches = DATA['ops'].reduce([]) do |r, set|
+  prefix = (set.first == 'cb') ? 0xCB00 : 0x0000
+
+  set.last.reduce(r) do |r, op|
+    # op hex string
+    hex = (prefix + op['hex']).to_s(16).upcase.rjust(4, '0')
+
+    r << case op['op']
+    when 'XX'
+      [
+        "case 0x%s: /* op: %s, cat: %s */",
+        "  invalid(ctx, old_pc);",
+        "  break;",
+      ].join("\n") % [
+        hex,
+        op['id'],
+        op['cat'],
+      ]
+    else
+      # time expr
+      time_expr = case op['time']
+      when Numeric
+        'ctx->cpu.clock += %d;' % [op['time']]
+      when Hash
+        'ctx->cpu.clock += %d; // t: %d, f: %d' % %w{f t f}.map { |k| 
+          op['time'][k]
+        }
+      else
+        raise "unknown op time: #{hex}: #{op['time']}"
+      end
+
+      [
+        "case 0x%s: /* op: \"%s\", cat: \"%s\" */",
+        "  %s", # action_expr
+        "  %s", # time_expr
+        "  break;"
+      ].join("\n") % [
+        hex,
+        op['id'],
+        op['cat'],
+        op['code'] || 'not_implemented(ctx, old_pc, op);',
+        time_expr,
+      ]
+    end
+  end
+end.join("\n")
+
+t = ERB.new(DATA['templates']['main'])
+puts t.run(binding)