FIX: tdb: Update float parsing regex

pycalphad/io/tdb.py

@@ -180,7 +180,8 @@ def _tdb_grammar(): #pylint: disable=R0914
     int_number = Word(nums).setParseAction(lambda t: [int(t[0])])
     pos_neg_int_number = Word('+-'+nums).setParseAction(lambda t: [int(t[0])]) # '+3' or '-2' are examples
     # matching float w/ regex is ugly but is recommended by pyparsing
-    float_number = Regex(r'[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?') \
+    regex_after_decimal = r'([0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)'
+    float_number = Regex(r'[-+]?([0-9]+\.(?!([0-9]|[eE])))|{0}'.format(regex_after_decimal)) \
         .setParseAction(lambda t: [float(t[0])])
     # symbol name, e.g., phase name, function name
     symbol_name = Word(alphanums+'_:', min=1)

pycalphad/tests/test_database.py

@@ -406,3 +406,18 @@ def test_tdb_missing_terminator_element():
                FUNCTION EMBCCTI    298.15 -39.72; 6000 N !"""
     Database(tdb_str)
 
+
+def test_database_parsing_of_floats_with_no_values_after_decimal():
+    """Floats with no values after the decimal should be properly parsed (gh-143)"""
+    tdb_string = """$ The element has no values after the decimal in '5004.'
+        ELEMENT CU   FCC_A1           63.546           5004.             33.15      !"""
+    dbf = Database.from_string(tdb_string, fmt='tdb')
+    assert "CU" in dbf.elements
+
+
+def test_database_parsing_of_floats_with_multiple_leading_zeros():
+    """Floats with multiple leading zeros should be properly parsed (gh-143)"""
+    tdb_string = """$ The element has multiple leading zeros in '00.546'
+        ELEMENT CU   FCC_A1           00.546           5004.0             33.15      !"""
+    dbf = Database.from_string(tdb_string, fmt='tdb')
+    assert "CU" in dbf.elements