Merge pull request #8 from SummerGGift/add_gen_qstr

 add genhdr/gen_qstr.py to create micropython qstr

port/genhdr/gen_qstr.py

@@ -0,0 +1,61 @@
+from __future__ import print_function
+
+import re
+import sys
+
+import platform
+if platform.python_version_tuple()[0] == '2':
+    bytes_cons = lambda val, enc=None: bytearray(val)
+    from htmlentitydefs import codepoint2name
+elif platform.python_version_tuple()[0] == '3':
+    bytes_cons = bytes
+    from html.entities import codepoint2name
+# end compatibility code
+
+# this must match the equivalent function in qstr.c
+def compute_hash(qstr, bytes_hash):
+    hash = 5381
+    for b in qstr:
+        hash = (hash * 33) ^ b
+    # Make sure that valid hash is never zero, zero means "hash not computed"
+    return (hash & ((1 << (8 * bytes_hash)) - 1)) or 1
+    
+def make_bytes(cfg_bytes_len, cfg_bytes_hash, qstr):
+   
+    #print("qstr:",qstr)
+    #print("cfg_bytes_hash:",cfg_bytes_hash)
+    #print("cfg_bytes_len:",cfg_bytes_len)
+
+    qbytes = bytes_cons(qstr, 'utf8')
+    
+    #print("qbytes:",qbytes)
+    
+    qlen = len(qbytes)
+    qhash = compute_hash(qbytes, cfg_bytes_hash)
+    
+    #print("qlen:",qlen)
+    #print("cfg_bytes_hash:",cfg_bytes_hash)
+    #print("qhash:",qhash)
+    
+    if all(32 <= ord(c) <= 126 and c != '\\' and c != '"' for c in qstr):
+        # qstr is all printable ASCII so render it as-is (for easier debugging)
+        qdata = qstr
+    else:
+        # qstr contains non-printable codes so render entire thing as hex pairs
+        qdata = ''.join(('\\x%02x' % b) for b in qbytes)
+    if qlen >= (1 << (8 * cfg_bytes_len)):
+        print('qstr is too long:', qstr)
+        assert False
+    qlen_str = ('\\x%02x' * cfg_bytes_len) % tuple(((qlen >> (8 * i)) & 0xff) for i in range(cfg_bytes_len))
+    qhash_str = ('\\x%02x' * cfg_bytes_hash) % tuple(((qhash >> (8 * i)) & 0xff) for i in range(cfg_bytes_hash))
+    return '(const byte*)"%s%s" "%s"' % (qhash_str, qlen_str, qdata)
+    
+if __name__ == "__main__":
+    print ("This program will gen qstr for micropython:")
+    
+    for arg in sys.argv:
+        if arg == 'gen_qstr.py':
+            continue
+        qstr_computer = make_bytes(1, 1, arg)
+        print (qstr_computer)
+