From 27e183a78c8062ed7c2bbb91655a5e56cd697bba Mon Sep 17 00:00:00 2001
From: Cengiz Kaygusuz <cngkaygusuz@gmail.com>
Date: Mon, 20 Nov 2017 20:46:39 -0500
Subject: Move src to root

---
 examples/rangeCheck.py | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 examples/rangeCheck.py

(limited to 'examples/rangeCheck.py')

diff --git a/examples/rangeCheck.py b/examples/rangeCheck.py
new file mode 100644
index 0000000..67cf267
--- /dev/null
+++ b/examples/rangeCheck.py
@@ -0,0 +1,62 @@
+# rangeCheck.py
+#
+#   A sample program showing how parse actions can convert parsed 
+# strings into a data type or object, and to validate the parsed value.
+#
+# Updated to use new addCondition method and expr() copy.
+#
+# Copyright 2011,2015 Paul T. McGuire
+#
+
+from pyparsing import Word, nums, Suppress, ParseException, empty, Optional
+from datetime import datetime
+
+def ranged_value(expr, minval=None, maxval=None):
+    # have to specify at least one range boundary
+    if minval is None and maxval is None:
+        raise ValueError("minval or maxval must be specified")
+
+    # set range testing function and error message depending on
+    # whether either or both min and max values are given
+    inRangeCondition = {
+        (True, False)  : lambda s,l,t : t[0] <= maxval,
+        (False, True)  : lambda s,l,t : minval <= t[0],
+        (False, False) : lambda s,l,t : minval <= t[0] <= maxval,
+        }[minval is None, maxval is None]
+    outOfRangeMessage = {
+        (True, False)  : "value is greater than %s" % maxval,
+        (False, True)  : "value is less than %s" % minval,
+        (False, False) : "value is not in the range (%s to %s)" % (minval,maxval),
+        }[minval is None, maxval is None]
+
+    return expr().addCondition(inRangeCondition, message=outOfRangeMessage)
+
+# define the expressions for a date of the form YYYY/MM/DD or YYYY/MM (assumes YYYY/MM/01)
+integer = Word(nums).setName("integer")
+integer.setParseAction(lambda t:int(t[0]))
+
+month = ranged_value(integer, 1, 12)
+day = ranged_value(integer, 1, 31)
+year = ranged_value(integer, 2000, None)
+    
+SLASH = Suppress('/')
+dateExpr = year("year") + SLASH + month("month") + Optional(SLASH + day("day"))
+dateExpr.setName("date")
+
+# convert date fields to datetime (also validates dates as truly valid dates)
+dateExpr.setParseAction(lambda t: datetime(t.year, t.month, t.day or 1).date())
+
+# add range checking on dates
+mindate = datetime(2002,1,1).date()
+maxdate = datetime.now().date()
+dateExpr = ranged_value(dateExpr, mindate, maxdate)
+
+
+dateExpr.runTests("""
+    2011/5/8
+    2001/1/1
+    2004/2/29
+    2004/2
+    1999/12/31""")
+
+
-- 
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