Add support for unicode literals when using pypa

We support the \u, \U and \N escape sequences and
the unicode_literals option.
In addition updates pypa to latest version with unicode support.

libpypa @ 2ce3f0ef

-Subproject commit 94fd3e1551188171fca8fb1d4bb7e2f916be33c4
+Subproject commit 2ce3f0ef83f6d3d4bdd1ab841e2ca4c3417d93a4

src/codegen/pypa-parser.cpp

@@ -31,6 +31,9 @@
 #include "core/stats.h"
 #include "core/types.h"
 #include "core/util.h"
+#include "runtime/capi.h"
+#include "runtime/objmodel.h"
+#include "runtime/types.h"
 
 namespace pypa {
 bool string_to_double(String const& s, double& result);
@@ -511,7 +514,7 @@ struct expr_dispatcher {
     ResultPtr read(pypa::AstStr& s) {
         AST_Str* ptr = new AST_Str();
         location(ptr, s);
-        ptr->str_type = AST_Str::STR;
+        ptr->str_type = s.unicode ? AST_Str::UNICODE : AST_Str::STR;
         ptr->str_data = s.value;
         return ptr;
     }
@@ -799,7 +802,7 @@ struct stmt_dispatcher {
         location(ptr, d);
         AST_Str* str = new AST_Str();
         ptr->value = str;
-        str->str_type = AST_Str::STR;
+        str->str_type = d.unicode ? AST_Str::UNICODE : AST_Str::STR;
         str->str_data = d.doc;
         return ptr;
     }
@@ -823,14 +826,32 @@ AST_Module* readModule(pypa::AstModule& t) {
 }
 
 void pypaErrorHandler(pypa::Error e) {
-    //    raiseSyntaxError
-    //    void raiseSyntaxError(const char* msg, int lineno, int col_offset, const
-    //    std::string& file, const std::string& func);
     if (e.type != pypa::ErrorType::SyntaxWarning) {
         raiseSyntaxError(e.message.c_str(), e.cur.line, e.cur.column, e.file_name, std::string());
     }
 }
 
+pypa::String pypaUnicodeEscapeDecoder(pypa::String s, bool raw_prefix, bool& error) {
+    try {
+        error = false;
+        Box* unicode = NULL;
+        if (raw_prefix)
+            unicode = PyUnicode_DecodeRawUnicodeEscape(s.c_str(), s.size(), "strict");
+        else
+            unicode = PyUnicode_DecodeUnicodeEscape(s.c_str(), s.size(), "strict");
+        checkAndThrowCAPIException();
+        BoxedString* str_utf8 = (BoxedString*)PyUnicode_AsUTF8String(unicode);
+        checkAndThrowCAPIException();
+        return str_utf8->s;
+    } catch (ExcInfo e) {
+        error = true;
+        BoxedString* error_message = str(e.value);
+        if (error_message && error_message->cls == str_cls)
+            return error_message->s;
+        return "Encountered an unknown error inside pypaUnicodeEscapeDecoder";
+    }
+}
+
 AST_Module* pypa_parse(char const* file_path) {
     pypa::Lexer lexer(file_path);
     pypa::SymbolTablePtr symbols;
@@ -842,6 +863,7 @@ AST_Module* pypa_parse(char const* file_path) {
     options.python3only = false;
     options.handle_future_errors = false;
     options.error_handler = pypaErrorHandler;
+    options.unicode_escape_handler = pypaUnicodeEscapeDecoder;
 
     if (pypa::parse(lexer, module, symbols, options) && module) {
         return readModule(*module);

src/jit.cpp

@@ -231,6 +231,7 @@ static int main(int argc, char** argv) {
 
             add_history(line);
 
+            try {
                 AST_Module* m = parse_string(line);
 
                 Timer _t("repl");
@@ -253,7 +254,6 @@ static int main(int argc, char** argv) {
                     m->body[0] = p;
                 }
 
-            try {
                 compileAndRunModule(m, main_module);
             } catch (ExcInfo e) {
                 int retcode = 0xdeadbeef; // should never be seen

src/runtime/stacktrace.cpp

@@ -118,11 +118,9 @@ void raiseSyntaxError(const char* msg, int lineno, int col_offset, const std::st
     Box* exc = runtimeCall(SyntaxError, ArgPassSpec(1), boxStrConstant(msg), NULL, NULL, NULL, NULL);
 
     auto tb = getTraceback();
-    // TODO: push the syntax error line back on it:
-    //// TODO: leaks this!
-    // last_tb.push_back(new LineInfo(lineno, col_offset, file, func));
-
-    raiseRaw(ExcInfo(exc->cls, exc, tb));
+    std::vector<const LineInfo*> entries = tb->lines;
+    entries.push_back(new LineInfo(lineno, col_offset, file, func));
+    raiseRaw(ExcInfo(exc->cls, exc, new BoxedTraceback(std::move(entries))));
 }
 
 void _printStacktrace() {

test/tests/json_test.py

-# skip-if: '-x' in EXTRA_JIT_ARGS
-
 from StringIO import StringIO
 import json
 

test/tests/prevent_nonascii_attrs.py

-# skip-if: '-x' in EXTRA_JIT_ARGS
-
 def f(a):
     print a
 

test/tests/unicode_test.py

-# skip-if: '-x' in EXTRA_JIT_ARGS
-
 print repr(unicode())
 print repr(unicode('hello world'))
 
@@ -32,6 +30,7 @@ print u"Hello " + " World"
 def p(x):
     return [hex(ord(i)) for i in x]
 s = u"\u20AC" # euro sign
+print p(u"\N{EURO SIGN}")
 print p(s) 
 print p(s.encode("utf8"))
 print p(s.encode("utf16"))

test/tests/unicodedata_test.py

-# skip-if: '-x' in EXTRA_JIT_ARGS
 import unicodedata
 print unicodedata.lookup("EURO SIGN") == u"\u20ac"
 print unicodedata.name(u"/")