Merge pull request #57 from yui-knk/test_for_named_references

Test for named references

spec/lrama/integration_spec.rb

@@ -81,7 +81,6 @@ def test_rules(rules, input, expected)
  %w['*'],
  %w[NUM val 3]
  ]
- expected = "9"
 
  test_rules(<<~Rules, input, "=> 9")
  %union {
@@ -109,4 +108,36 @@ def test_rules(rules, input, expected)
  Rules
  end
  end
+
+ describe "named references" do
+ it "returns 3 for '1 2 +" do
+ # 1 2 + #=> 3
+ input = [
+ %w[NUM val 1],
+ %w[NUM val 2],
+ %w['+'],
+ ]
+
+ test_rules(<<~Rules, input, "=> 3")
+ %union {
+ int val;
+ }
+ %token <val> NUM
+ %type <val> expr
+
+ %%
+
+ line: expr
+ { printf("=> %d", $expr); }
+ ;
+
+ expr[result]: NUM
+ | expr[left] expr[right] '+'
+ { $result = $left + $right; }
+ ;
+
+ %%
+ Rules
+ end
+ end
 end