Fix parsing of floating point numbers.

pymbolic/parser.py

@@ -57,9 +57,9 @@ class Parser:
             (_imaginary, (_float, pytools.lex.RE("j"))),
             (_float, ("|",
                 pytools.lex.RE(r"[+-]?[0-9]+\.[0-9]*([eEdD][+-]?[0-9]+)?"),
-                pytools.lex.RE(r"[+-]?[0-9]+(\.[0-9]*)?[eEdD][+-]?[0-9]+"),
+                pytools.lex.RE(r"[+-]?[0-9]+(\.[0-9]*)?[eEdD][+-]?[0-9]+\b"),
                 pytools.lex.RE(r"[+-]?[0-9]*\.[0-9]+([eEdD][+-]?[0-9]+)?"),
-                pytools.lex.RE(r"[+-]?[0-9]*(\.[0-9]+)?[eEdD][+-]?[0-9]+"))),
+                pytools.lex.RE(r"[+-]?[0-9]*(\.[0-9]+)?[eEdD][+-]?[0-9]+\b"))),
             (_int, pytools.lex.RE(r"[0-9]+")),
             (_plus, pytools.lex.RE(r"\+")),
             (_minus, pytools.lex.RE(r"-")),

test/test_pymbolic.py

@@ -135,6 +135,9 @@ def test_parser():
     parse("(2*a[1]*b[1]+2*a[0]*b[0])*(hankel_1(-1,sqrt(a[1]**2+a[0]**2)*k) "
             "-hankel_1(1,sqrt(a[1]**2+a[0]**2)*k))*k /(4*sqrt(a[1]**2+a[0]**2)) "
             "+hankel_1(0,sqrt(a[1]**2+a[0]**2)*k)")
+    print repr(parse("d4knl0"))
+    print repr(parse("0."))
+    print repr(parse("0.e1"))