Add support for C++14 binary integer literals

Closes #1030.

CHANGES.current

@@ -7,6 +7,9 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.0.0 (in progress)
 ===========================
 
+2019-02-10: ZackerySpytz
+	    #1464 Add support for C++14 binary integer literals.
+
 2019-02-10: ZackerySpytz
 	    #1450 Add support for C++11 UCS-2 and UCS-4 character literals. Also add support for
             C++17 UTF8 character literals.

Examples/test-suite/common.mk

@@ -162,6 +162,7 @@ CPP_TEST_CASES += \
 	cpp_nodefault \
 	cpp_static \
 	cpp_typedef \
+	cpp14_binary_integer_literals \
 	cpp17_nested_namespaces \
 	cpp17_nspace_nested_namespaces \
 	cpp17_u8_char_literals \

Examples/test-suite/cpp14_binary_integer_literals.i

@@ -0,0 +1,31 @@
+%module cpp14_binary_integer_literals
+
+// Tests are designed so that code compiles with C++98 compilers
+
+%{
+#if __cplusplus >= 201402L
+#define CPP14 1
+#endif
+%}
+
+int b1 = 0b1;
+int b2 = 0b10;
+long b3 = 0b11l;
+unsigned long b4 = 0b100ul;
+unsigned long b5 = 0B101UL;
+
+%{
+#if defined(CPP14)
+int b1 = 0b1;
+int b2 = 0b10;
+long b3 = 0b11l;
+unsigned long b4 = 0b100ul;
+unsigned long b5 = 0B101UL;
+#else
+int b1 = 1;
+int b2 = 2;
+long b3 = 3;
+unsigned long b4 = 4;
+unsigned long b5 = 5;
+#endif
+%}

Examples/test-suite/python/cpp14_binary_integer_literals_runme.py

@@ -0,0 +1,16 @@
+from cpp14_binary_integer_literals import *
+
+if cvar.b1 != 1:
+    raise RuntimeError
+
+if cvar.b2 != 2:
+    raise RuntimeError
+
+if cvar.b3 != 3:
+    raise RuntimeError
+
+if cvar.b4 != 4:
+    raise RuntimeError
+
+if cvar.b5 != 5:
+    raise RuntimeError

Source/Swig/scanner.c

@@ -1162,6 +1162,8 @@ static int look(Scanner *s) {
 	state = 84;
       else if ((c == 'x') || (c == 'X'))
 	state = 85;
+      else if ((c == 'b') || (c == 'B'))
+	state = 850;
       else if (c == '.')
 	state = 81;
       else if ((c == 'l') || (c == 'L')) {
@@ -1203,6 +1205,21 @@ static int look(Scanner *s) {
 	return SWIG_TOKEN_INT;
       }
       break;
+    case 850:
+      /* This is a binary number */
+      if ((c = nextchar(s)) == 0)
+	return SWIG_TOKEN_INT;
+      if ((c == '0') || (c == '1'))
+	state = 850;
+      else if ((c == 'l') || (c == 'L')) {
+	state = 87;
+      } else if ((c == 'u') || (c == 'U')) {
+	state = 88;
+      } else {
+	retract(s, 1);
+	return SWIG_TOKEN_INT;
+      }
+      break;
 
     case 86:
       /* Rest of floating point number */