Add test for literals

test/corpus/literals.txt

@@ -0,0 +1,134 @@
+================================================================================
+Booelan literal
+================================================================================
+
+foo = true
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (boolean_literal)))
+
+================================================================================
+Integer literal
+================================================================================
+
+foo = 42
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (integer_literal)))
+
+================================================================================
+String literal
+================================================================================
+
+foo = "Hello World!"
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (interpreted_string_literal)))
+
+================================================================================
+String literal special character escapes
+================================================================================
+
+foo = "Hello\nWorld!"
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (interpreted_string_literal
+      (escape_sequence))))
+
+================================================================================
+String literal octal
+================================================================================
+
+foo = "Hello World\041"
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (interpreted_string_literal
+      (escape_sequence))))
+
+================================================================================
+String literal hex
+================================================================================
+
+foo = "Hello World\x21"
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (interpreted_string_literal
+      (escape_sequence))))
+
+================================================================================
+String literal character escapes
+================================================================================
+
+foo = "Hello\\\"World\""
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (interpreted_string_literal
+      (escape_sequence)
+      (escape_sequence)
+      (escape_sequence))))
+
+================================================================================
+Unterminated string literal
+================================================================================
+
+foo = "
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (interpreted_string_literal
+      (MISSING """))))
+
+================================================================================
+String literal unterminated escape
+================================================================================
+
+foo = "\"
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (interpreted_string_literal
+      (escape_sequence)
+      (MISSING """))))