Use table-driven tests for specific parsers

spec/runtime/languages/arithmetic/errors.txt

@@ -0,0 +1,16 @@
+=====================================================
+recovers from errors at the top level
+=====================================================
+x * * y
+---
+(ERROR)
+
+=====================================================
+recovers from errors inside parenthesized expressions
+=====================================================
+x + (y * + z) * 5
+---
+(expression
+    (term (factor (variable)))
+    (plus)
+    (term (factor (ERROR)) (times) (factor (number))))

spec/runtime/languages/arithmetic/main.txt

@@ -0,0 +1,54 @@
+====================
+parses numbers
+===================
+5
+---
+(expression (term (factor (number))))
+
+===================
+parses variables
+===================
+x
+---
+(expression (term (factor (variable))))
+
+===================
+parses products
+===================
+x * x
+---
+(expression (term
+    (factor (variable))
+    (times)
+    (factor (variable))))
+
+===================
+parses sums
+===================
+x + x
+---
+(expression
+    (term (factor (variable)))
+    (plus)
+    (term (factor (variable))))
+
+====================
+parses complex trees
+====================
+x * y + z * a
+---
+(expression
+    (term (factor (variable)) (times) (factor (variable)))
+    (plus)
+    (term (factor (variable)) (times) (factor (variable))))
+
+=================================
+handles parenthesized expressions
+=================================
+x * (y + z)
+---
+(expression
+    (term (factor (variable))
+    (times)
+    (factor (expression (term (factor (variable))) (plus) (term (factor (variable)))))))
+

spec/runtime/languages/json/errors.txt

@@ -0,0 +1,33 @@
+==============================
+recovers from top-level errors
+==============================
+[}
+---
+(ERROR)
+
+==================================
+recovers from errors inside arrays
+==================================
+[1,,2]
+---
+(value (array
+    (value (number))
+    (ERROR)
+    (value (number))))
+
+==================================
+recovers from errors inside objects
+==================================
+{ "key1": 1, 5 }
+---
+(value (object (string) (value (number)) (ERROR)))
+
+==========================================
+recovers from errors inside nested objects
+==========================================
+{ "key1": { "key2": 1, 2 }, [, "key3": 3 }
+---
+(value (object
+    (string) (value (object (string) (value (number)) (ERROR)))
+    (ERROR)
+    (string) (value (number))))

spec/runtime/languages/json/main.txt

@@ -0,0 +1,44 @@
+====================
+parses empty objects
+====================
+{}
+---
+(value (object))
+
+===================
+parses empty arrays
+===================
+[]
+---
+(value (array))
+
+===================
+parses arrays
+===================
+[
+    1, 2, 3,
+    { "stuff": "good" }
+]
+---
+(value (array
+    (value (number))
+    (value (number))
+    (value (number))
+    (value (object
+        (string) (value (string))
+    ))
+))
+
+===================
+parses long objects
+===================
+{
+	"key1": "value1",
+	"key2": 1
+}
+---
+(value (object
+	(string) (value (string))
+	(string) (value (number))
+))
+