use parameter instead of payload

TagScriptEngine/block/case.py

@@ -1,56 +1,54 @@
-from typing import Optional
-
-from ..interface import verb_required_block
+from ..interface import Block
 from ..interpreter import Context
 
+class UpperBlock(Block):
+    """Converts the given text to uppercase.
 
-class UpperBlock(verb_required_block(True, payload=True)):
-    """
-    Converts the given text to uppercase.
-
-    **Usage:** ``{upper:<string>}``
+    **Usage:**  ``{upper([text]))}``
 
-    **Aliases:** ``upper``
+    **Aliases:**  ``uppercase, upper``
 
-    **Payload:** ``string``
+    **Payload:**  None
 
-    **Parameter:** ``None``
+    **Parameter:**  text
 
-    **Examples: **
+    **Examples:**  ::
 
-    .. tagscript::
+        The text is {lower(ThIs Is A TeXt)}!
+        # The text is THIS IS A TEXT!
 
-        {upper:ThiS is A Text}
-        # THIS IS A TEXT
+        You have entered {lower({args})}!
+        # You have entered HELLO WORLD!
     """
 
-    ACCEPTED_NAMES = "upper"
+    ACCEPTED_NAMES = ("upper","uppercase")
 
-    def process(self, ctx: Context) -> Optional[str]:
-        return ctx.verb.payload.upper()
+    def process(self, ctx: Context) -> str:
+        text = str(ctx.verb.parameter).upper()
+        return "" if text == "NONE" else text
 
+class LowerBlock(Block):
+    """Converts the given text to lowercase.
 
-class LowerBlock(verb_required_block(True, payload=True)):
-    """
-    Converts the given text to lowercase.
-
-    **Usage:** ``{lower:<string>}``
+    **Usage:**  ``{lower([text])}``
 
-    **Aliases:** ``lower``
+    **Aliases:**  ``lowercase, lower``
 
-    **Payload:** ``string``
+    **Payload:**  None
 
-    **Parameter:** ``None``
+    **Parameter:**  text
 
-    **Examples: **
+    **Examples:**  ::
 
-    .. tagscript::
+        The text is {lower(ThIs Is A TeXt)}!
+        # The text is this is a text!
 
-        {upper:ThiS is A Text}
-        # this is a text
+        You have entered {lower({args})}!
+        # You have entered hello world!
     """
 
-    ACCEPTED_NAMES = "lower"
+    ACCEPTED_NAMES = ("lower","lowercase")
 
-    def process(self, ctx: Context) -> Optional[str]:
-        return ctx.verb.payload.lower()
+    def process(self, ctx: Context) -> str:
+        text = str(ctx.verb.parameter).lower()
+        return "" if text == "none" else text