implement string

mytests/test_string.py

@@ -1,10 +1,24 @@
 import py
+from rply import Token
 
+from simpleast import Program, ExprStatement, BooleanLiteral, ImplicitSelf, Assignment, StringLiteral
+from simplelexer import lex
 from simpleparser import parse
-from objmodel import W_NormalObject, W_Integer
+from objmodel import W_NormalObject, W_Integer, W_String, W_Boolean
 from interpreter import Interpreter
 
 
+def test_basic_string_lexing():
+    assert lex("\"Hallo\"")[0] == Token("String", "\"Hallo\"")
+    assert lex("\'Hallo\'")[0] == Token("String", "\'Hallo\'")
+    assert lex("x = \"true\"")[:3] == [Token("Name", "x"), Token("Assign", "="), Token("String", "\"true\"")]
+
+
+def test_basic_string_parsing():
+    assert parse("\"false\"") == Program([ExprStatement(StringLiteral("false"))])
+    assert parse("x = \"false\"") == Program([Assignment(ImplicitSelf(), "x", StringLiteral("false"))])
+
+
 def test_string_assignment():
     ast = parse("""
 x = "Hallo"
@@ -19,6 +33,7 @@ x = "Hallo"
 
 def test_string_operations():
     ast = parse("""
+w = "Hallo" eq("Hallo")
 x = "Hallo" add("ollaH")
 y = "Hallo" rev
 z = "Hallo" len
@@ -27,9 +42,33 @@ z = "Hallo" len
     w_model = interpreter.make_module()
     interpreter.eval(ast, w_model)
 
+    assert isinstance(w_model.getvalue("w"), W_Boolean)
+    assert w_model.getvalue("w").istrue() is True
     assert isinstance(w_model.getvalue("x"), W_String)
     assert w_model.getvalue("x").value == "HalloollaH"
     assert isinstance(w_model.getvalue("y"), W_String)
     assert w_model.getvalue("y").value == "ollaH"
     assert isinstance(w_model.getvalue("z"), W_Integer)
     assert w_model.getvalue("z").value == 5
+
+
+def test_string_conversion():
+    ast = parse("""
+w = "true" tobool
+x = true tostr
+y = 25 tostr
+z = "25" toint
+""")
+
+    interpreter = Interpreter()
+    w_model = interpreter.make_module()
+    interpreter.eval(ast, w_model)
+
+    assert isinstance(w_model.getvalue("w"), W_Boolean)
+    assert w_model.getvalue("w").istrue() is True
+    assert isinstance(w_model.getvalue("x"), W_String)
+    assert w_model.getvalue("x").value == "true"
+    assert isinstance(w_model.getvalue("y"), W_String)
+    assert w_model.getvalue("y").value == "25"
+    assert isinstance(w_model.getvalue("z"), W_Integer)
+    assert w_model.getvalue("z").value == 25