From: Simon Forman <sforman@hushmail.com>
Date: Tue, 6 Apr 2021 18:34:46 +0000 (-0700)
Subject: Parse Boolean literals.
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=14c16d469f4b423849f576c35c0a5607a0a2b823;p=joypy%2FThun.git

Parse Boolean literals.
---

diff --git a/joy/parser.py b/joy/parser.py
index de8a873..ccd68dc 100644
--- a/joy/parser.py
+++ b/joy/parser.py
@@ -41,6 +41,7 @@ from .utils.stack import list_to_stack
 
 
 #TODO: explain the details of float lits and strings.
+BOOL = 'true|false'
 FLOAT = r'-?\d+\.\d*(e(-|\+)\d+)?'
 INT = r'-?\d+'
 SYMBOL = r'[•\w!@$%^&*()_+<>?|\/;:`~,.=-]+'
@@ -114,11 +115,12 @@ def _parse(tokens):
 
 
 _scanner = Scanner([
-	(FLOAT, lambda _, token: float(token)),
-	(INT, lambda _, token: int(token)),
-	(SYMBOL, lambda _, token: Symbol(token)),
-	(BRACKETS, lambda _, token: token),
+	(                BOOL, lambda _, token: token == 'true'),
+	(               FLOAT, lambda _, token: float(token)),
+	(                 INT, lambda _, token: int(token)),
+	(              SYMBOL, lambda _, token: Symbol(token)),
+	(            BRACKETS, lambda _, token: token),
 	(STRING_DOUBLE_QUOTED, lambda _, token: token[1:-1].replace('\\"', '"')),
 	(STRING_SINGLE_QUOTED, lambda _, token: token[1:-1].replace("\\'", "'")),
-	(BLANKS, None),
+	(              BLANKS, None),
 	])