[issue2630] repr() should not escape non-ASCII characters

Objects/unicodectype.c

 /*
    Unicode character type helpers.
 
    Written by Marc-Andre Lemburg (mal@lemburg.com).
    Modified for Python 2.0 by Fredrik Lundh (fredrik@pythonware.com)
 
    Copyright (c) Corporation for National Research Initiatives.
 
 */
 
 #include "Python.h"
 #include "unicodeobject.h"
 
 #define ALPHA_MASK 0x01
 #define DECIMAL_MASK 0x02
 #define DIGIT_MASK 0x04
 #define LOWER_MASK 0x08
 #define LINEBREAK_MASK 0x10
 #define SPACE_MASK 0x20
 #define TITLE_MASK 0x40
 #define UPPER_MASK 0x80
 #define XID_START_MASK 0x100
 #define XID_CONTINUE_MASK 0x200
+#define HEX_ESCAPE_MASK 0x400
 
 typedef struct {
     const Py_UNICODE upper;
     const Py_UNICODE lower;
     const Py_UNICODE title;
     const unsigned char decimal;
     const unsigned char digit;
     const unsigned short flags;
 } _PyUnicode_TypeRecord;
 
@@ skipping 633 matching lines @@
 #endif
     default:
         return (double) _PyUnicode_ToDigit(ch);
     }
 }
 
 int _PyUnicode_IsNumeric(Py_UNICODE ch)
 {
     return _PyUnicode_ToNumeric(ch) != -1.0;
 }
+
+/* Returns 1 for Unicode characters to be hex-escaped when repr()ed,
+   0 otherwise. */
+
+int _PyUnicode_IsHexEscaped(Py_UNICODE ch)
+{
+    const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
+
+    return (ctype->flags & HEX_ESCAPE_MASK) != 0;
+}
+
 
 #ifndef WANT_WCTYPE_FUNCTIONS
 
 /* Returns 1 for Unicode characters having the bidirectional type
    'WS', 'B' or 'S' or the category 'Zs', 0 otherwise. */
 
 int _PyUnicode_IsWhitespace(register const Py_UNICODE ch)
 {
     switch (ch) {
     case 0x0009: /* HORIZONTAL TABULATION */
@@ skipping 115 matching lines @@
 {
     return towupper(ch);
 }
 
 int _PyUnicode_IsAlpha(Py_UNICODE ch)
 {
     return iswalpha(ch);
 }
 
 #endif