micropython/py/makeqstrdata.py

159 wiersze
5.4 KiB
Python

"""
Process raw qstr file and output qstr data with length, hash and data bytes.
This script works with Python 2.6, 2.7, 3.3 and 3.4.
"""
from __future__ import print_function
import re
import sys
# Python 2/3 compatibility:
# - iterating through bytes is different
# - codepoint2name lives in a different module
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
codepoint2name[ord('-')] = 'hyphen';
# add some custom names to map characters that aren't in HTML
codepoint2name[ord(' ')] = 'space'
codepoint2name[ord('\'')] = 'squot'
codepoint2name[ord(',')] = 'comma'
codepoint2name[ord('.')] = 'dot'
codepoint2name[ord(':')] = 'colon'
codepoint2name[ord(';')] = 'semicolon'
codepoint2name[ord('/')] = 'slash'
codepoint2name[ord('%')] = 'percent'
codepoint2name[ord('#')] = 'hash'
codepoint2name[ord('(')] = 'paren_open'
codepoint2name[ord(')')] = 'paren_close'
codepoint2name[ord('[')] = 'bracket_open'
codepoint2name[ord(']')] = 'bracket_close'
codepoint2name[ord('{')] = 'brace_open'
codepoint2name[ord('}')] = 'brace_close'
codepoint2name[ord('*')] = 'star'
codepoint2name[ord('!')] = 'bang'
codepoint2name[ord('\\')] = 'backslash'
codepoint2name[ord('+')] = 'plus'
codepoint2name[ord('$')] = 'dollar'
codepoint2name[ord('=')] = 'equals'
codepoint2name[ord('?')] = 'question'
codepoint2name[ord('@')] = 'at_sign'
codepoint2name[ord('^')] = 'caret'
codepoint2name[ord('|')] = 'pipe'
codepoint2name[ord('~')] = 'tilde'
# 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 qstr_escape(qst):
def esc_char(m):
c = ord(m.group(0))
try:
name = codepoint2name[c]
except KeyError:
name = '0x%02x' % c
return "_" + name + '_'
return re.sub(r'[^A-Za-z0-9_]', esc_char, qst)
def parse_input_headers(infiles):
# read the qstrs in from the input files
qcfgs = {}
qstrs = {}
for infile in infiles:
with open(infile, 'rt') as f:
for line in f:
line = line.strip()
# is this a config line?
match = re.match(r'^QCFG\((.+), (.+)\)', line)
if match:
value = match.group(2)
if value[0] == '(' and value[-1] == ')':
# strip parenthesis from config value
value = value[1:-1]
qcfgs[match.group(1)] = value
continue
# is this a QSTR line?
match = re.match(r'^Q\((.*)\)$', line)
if not match:
continue
# get the qstr value
qstr = match.group(1)
# special case to specify control characters
if qstr == '\\n':
qstr = '\n'
# work out the corresponding qstr name
ident = qstr_escape(qstr)
# don't add duplicates
if ident in qstrs:
continue
# add the qstr to the list, with order number to retain original order in file
qstrs[ident] = (len(qstrs), ident, qstr)
if not qcfgs:
sys.stderr.write("ERROR: Empty preprocessor output - check for errors above\n")
sys.exit(1)
return qcfgs, qstrs
def make_bytes(cfg_bytes_len, cfg_bytes_hash, qstr):
qbytes = bytes_cons(qstr, 'utf8')
qlen = len(qbytes)
qhash = compute_hash(qbytes, cfg_bytes_hash)
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)
def print_qstr_data(qcfgs, qstrs):
# get config variables
cfg_bytes_len = int(qcfgs['BYTES_IN_LEN'])
cfg_bytes_hash = int(qcfgs['BYTES_IN_HASH'])
# print out the starter of the generated C header file
print('// This file was automatically generated by makeqstrdata.py')
print('')
# add NULL qstr with no hash or data
print('QDEF(MP_QSTR_NULL, (const byte*)"%s%s" "")' % ('\\x00' * cfg_bytes_hash, '\\x00' * cfg_bytes_len))
# go through each qstr and print it out
for order, ident, qstr in sorted(qstrs.values(), key=lambda x: x[0]):
qbytes = make_bytes(cfg_bytes_len, cfg_bytes_hash, qstr)
print('QDEF(MP_QSTR_%s, %s)' % (ident, qbytes))
def do_work(infiles):
qcfgs, qstrs = parse_input_headers(infiles)
print_qstr_data(qcfgs, qstrs)
if __name__ == "__main__":
do_work(sys.argv[1:])