Added initial version of t.py

Author: WebReflection

test/t.py

@@ -0,0 +1,75 @@
+__all__ = ["t"]
+
+
+class Interpolation:
+    def __init__(self, expr):
+        self.expr = expr
+
+    def __getattr__(self, name):
+        expr = getattr(self, "expr")
+        if name == "value":
+            return eval(expr)
+        if name == "expr":
+            return expr
+        if name == "conv":
+            return None
+        if name == "format_spec":
+            return ""
+
+
+class Template:
+    def __init__(self, args):
+        self.args = tuple(args)
+
+    def __getattr__(self, name):
+        args = getattr(self, "args")
+        if name == "args":
+            return args
+        if name == "strings":
+            return args[::2]
+        if name == "values":
+            return [i.value for i in args[1::2]]
+        if name == "interpolations":
+            return args[1::2]
+
+    def __str__(self):
+        out = []
+        i = 0
+        for arg in getattr(self, "args"):
+            out.append(i % 2 and str(arg.value) or arg)
+            i += 1
+        return "".join(out)
+
+
+drop = lambda s: s.replace("{{", "\x01").replace("}}", "\x02")
+add = lambda s: s.replace("\x01", "{{").replace("\x02", "}}")
+
+
+# PEP750 shim as function for MicroPython or Pyodide until it lands
+def t(content):
+    # sanitize brackets (drop double brackets)
+    content = drop(content)
+    # fail if the format string is not balanced
+    if content.count("{") != content.count("}"):
+        raise ValueError("single '{' or '}' encountered in format string")
+    # find outer most interesting curly braces
+    l = len(content)
+    i = 0
+    j = 0
+    start = 0
+    opened = 0
+    args = []
+    for c in content:
+        if c == "{":
+            if opened == 0:
+                j = i
+            opened += 1
+        elif c == "}":
+            opened -= 1
+            if opened == 0:
+                args.append(add(content[start:j:]))
+                args.append(Interpolation(add(content[j + 1 : i :])))
+                start = i + 1
+        i += 1
+    args.append(add(content[start::]))
+    return Template(args)