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#! /usr/bin/env python
#
# Creates a possibly faster lookup table for tokens, etc.
#
# @author Ben Gardner
# @author Matthew Woehlke
# @license GPL v2+
#
import argparse
import os
import sys
# -----------------------------------------------------------------------------
def scan_file(file_path):
cur_token = ''
token_idx = 0
args = []
fd = open(file_path, 'r')
for line in fd:
line = line.strip()
if line.startswith('static const chunk_tag_t'):
idx = line.find('[')
if idx > 0:
cur_token = line[25:idx].strip()
token_idx = 0
else:
if len(cur_token) > 0:
idx1 = line.find('{')
idx2 = line.find('CT_')
if idx1 >= 0 and idx2 > idx1:
tok = line[idx1 + 1:idx2].strip()
if tok.startswith('R"'):
pos_paren_open = tok.find('(')
pos_paren_close = tok.rfind(')')
if pos_paren_open == -1 or pos_paren_close == -1:
sys.stderr.write(
'raw string parenthesis not found\n')
sys.exit(-1)
tok = tok[pos_paren_open+1:pos_paren_close]
else:
tok = tok[1:-2] # strip off open quotes and commas
args.append([tok, '%s[%d]' % (cur_token, token_idx)])
token_idx += 1
return args
# -----------------------------------------------------------------------------
def build_table(db, prev, arr):
# do the current level first
k = sorted(db)
if len(k) <= 0:
return
k.sort()
start_idx = len(arr)
num_left = len(k)
for i in k:
en = db[i]
# [ char, full-string, left-in-group, next_index, table-entry ]
num_left -= 1
arr.append([en[0], prev + en[0], num_left, 0, en[2]])
# update the one-up level index
if len(prev) > 0:
for idx in range(0, len(arr)):
if arr[idx][1] == prev:
arr[idx][3] = start_idx
break
# Now do each sub level
for i in k:
en = db[i]
build_table(en[3], prev + en[0], arr)
# -----------------------------------------------------------------------------
def add_to_db(entry, db_top):
"""
find or create the entry for the first char
"""
strng = entry[0]
db_cur = db_top
for idx in range(0, len(strng)):
if not strng[idx] in db_cur:
db_cur[strng[idx]] = [strng[idx], 0, None, {}]
dbe = db_cur[strng[idx]]
if idx == len(strng) - 1:
dbe[2] = entry
else:
db_cur = dbe[3]
# -----------------------------------------------------------------------------
def quote(s):
return '\'{}\''.format(s)
# -----------------------------------------------------------------------------
def escape(s):
return quote(s.replace('\'', '\\\''))
# -----------------------------------------------------------------------------
def write_entry(out, max_len, ch, left_in_group, next_idx, tag, idx, tok):
out.write(
' {{ {:>4}, {:>3d}, {:>3d}, {:{}} }}, // {:3d}: {}'.format(
ch, left_in_group, next_idx, tag, max_len, idx, tok).rstrip())
out.write('\n')
# -----------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description='Generate punctuator_table.h')
parser.add_argument('output', type=str,
help='location of punctuator_table.h to write')
parser.add_argument('header', type=str,
help='location of symbols_table.h to read')
args = parser.parse_args()
root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
pl = scan_file(args.header)
pl.sort()
db = {}
for a in pl:
add_to_db(a, db)
arr = []
build_table(db, '', arr)
max_len = len('nullptr')
for i in arr:
rec = i[4]
if rec is not None and (len(rec[1]) + 1) > max_len:
max_len = len(rec[1]) + 1
in_name = os.path.basename(args.header)
out_name = os.path.basename(args.output)
guard = out_name.replace('.', '_').upper()
with open(args.output, 'wt') as out:
out.write(
'/**\n'
' * @file {out_name}\n'
' * Automatically generated by <code>{script}</code>\n'
' * from {in_name}.\n'
' */\n'
'\n'
'#ifndef SRC_{guard}_\n'
'#define SRC_{guard}_\n'
'\n'
'// *INDENT-OFF*\n'
'static const lookup_entry_t punc_table[] =\n'
'{{\n'.format(
in_name=in_name, out_name=out_name, guard=guard,
script=os.path.relpath(__file__, root)))
idx = 0
for i in arr:
rec = i[4]
if len(i[0]) == 0:
write_entry(out, max_len, '0', '0', '0', 'nullptr', idx, '')
elif rec is None:
write_entry(out, max_len, escape(i[0]), i[2], i[3],
'nullptr', idx, quote(i[1]))
else:
write_entry(out, max_len, escape(i[0]), i[2], i[3],
'&' + rec[1], idx, quote(i[1]))
idx += 1
out.write(
'}};\n'
'// *INDENT-ON*\n'
'\n'
'#endif /* SRC_{guard}_ */\n'.format(guard=guard))
# %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if __name__ == '__main__':
main()
|
