fix missing requirements and add test caller

tests/cases.py

@@ -0,0 +1,70 @@
+#!/bin/env -S python
+
+from typing import TypeVar, Any
+from os.path import dirname
+import sys
+
+sys.path.append(f"{dirname(__file__)}/../src")
+from pyalibert import regex, Parser, just, Declare
+
+
+from okipy.lib import Suite
+
+
+# utils
+whitespace = just(" ").or_(just("\n")).repeat()
+T = TypeVar("T")
+def lexeme(p: Parser[T]) -> Parser[T]:
+    return p << whitespace
+
+
+suite = Suite("cases")
+
+
+@suite.test()
+def case_json(ctx):
+    # Punctuation
+    lbrace = lexeme(just("{"))
+    rbrace = lexeme(just("}"))
+    lbrack = lexeme(just("["))
+    rbrack = lexeme(just("]"))
+    colon = lexeme(just(":"))
+    comma = lexeme(just(","))
+    # Primitives
+    true = lexeme(just("true")).set(True)
+    false = lexeme(just("false")).set(False)
+    null = lexeme(just("null")).set(None)
+    number = lexeme(regex(r"-?(0|[1-9][0-9]*)([.][0-9]+)?([eE][+-]?[0-9]+)?")).map(float)
+    just_part = regex(r'[^"\\]+')
+    just_esc = just("\\") >> ( just("\\") | just("/") | just('"') | just("b").set("\b") | just("f").set("\f") | just("n").set("\n") | just("r").set("\r") | just("t").set("\t") | regex(r"u[0-9a-fA-F]{4}").map(lambda s: chr(int(s[1:], 16))))
+    quoted = lexeme(just('"') >> (just_part | just_esc).repeat().map(lambda l: "".join(l)) << just('"'))
+    # Data structures
+    json = Declare[Any]()
+    object_pair = (quoted << colon) & json.parser()
+    json_object = lbrace >> object_pair.sep_by(comma).map(dict) << rbrace
+    array = lbrack >> json.parser().sep_by(comma) << rbrack
+    # Everything
+    json.define(quoted | number | json_object | array | true | false | null)
+    json = json.parser()
+    # asserts
+    assert json.parse("1") == 1
+    assert json.parse('"1"') == "1"
+    assert json.parse('["1", 1]') == ["1", 1]
+    assert json.parse('{"1": 1}') == {"1": 1}
+    assert json.parse(r"""{
+            "int": 1,
+            "just": "hello",
+            "a list": [1, 2, 3],
+            "escapes": "\n \u24D2",
+            "nested": {"x": "y"},
+            "other": [true, false, null]
+        }""") == {
+            "int": 1,
+            "just": "hello",
+            "a list": [1, 2, 3],
+            "escapes": "\n ⓒ",
+            "nested": {"x": "y"},
+            "other": [True, False, None],
+        }
+
+if __name__ == "__main__": suite.run(sys.argv[1:])