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|
from speg import peg
import re, sys
if sys.version_info[0] == 2:
_chr = unichr
else:
_chr = chr
def load(fin):
return loads(fin.read())
def loads(s):
if isinstance(s, bytes):
s = s.decode('utf-8')
if s.startswith(u'\ufeff'):
s = s[1:]
return peg(s.replace('\r\n', '\n'), _p_root)
def _p_ws(p):
p('[ \t]*')
def _p_nl(p):
p(r'([ \t]*(?:#[^\n]*)?\r?\n)+')
def _p_ews(p):
with p:
p(_p_nl)
p(_p_ws)
def _p_id(p):
return p(r'[$a-zA-Z_][$0-9a-zA-Z_]*')
_escape_table = {
'r': '\r',
'n': '\n',
't': '\t',
'f': '\f',
'b': '\b',
}
def _p_unescape(p):
esc = p('\\\\(?:u[0-9a-fA-F]{4}|[^\n])')
if esc[1] == 'u':
return _chr(int(esc[2:], 16))
return _escape_table.get(esc[1:], esc[1:])
_re_indent = re.compile(r'[ \t]*')
def _p_block_str(p, c):
p(r'{c}{c}{c}'.format(c=c))
lines = [['']]
with p:
while True:
s = p(r'(?:{c}(?!{c}{c})|[^{c}\\])*'.format(c=c))
l = s.split('\n')
lines[-1].append(l[0])
lines.extend([x] for x in l[1:])
if p(r'(?:\\\n[ \t]*)*'):
continue
p.commit()
lines[-1].append(p(_p_unescape))
p(r'{c}{c}{c}'.format(c=c))
lines = [''.join(l) for l in lines]
strip_ws = len(lines) > 1
if strip_ws and all(c in ' \t' for c in lines[-1]):
lines.pop()
indent = None
for line in lines[1:]:
if not line:
continue
if indent is None:
indent = _re_indent.match(line).group(0)
continue
for i, (c1, c2) in enumerate(zip(indent, line)):
if c1 != c2:
indent = indent[:i]
break
ind_len = len(indent or '')
if strip_ws and all(c in ' \t' for c in lines[0]):
lines = [line[ind_len:] for line in lines[1:]]
else:
lines[1:] = [line[ind_len:] for line in lines[1:]]
return '\n'.join(lines)
_re_mstr_nl = re.compile(r'(?:[ \t]*\n)+[ \t]*')
_re_mstr_trailing_nl = re.compile(_re_mstr_nl.pattern + r'\Z')
def _p_multiline_str(p, c):
p('{c}(?!{c}{c})(?:[ \t]*\n[ \t]*)?'.format(c=c))
string_parts = []
with p:
while True:
string_parts.append(p(r'[^{c}\\]*'.format(c=c)))
if p(r'(?:\\\n[ \t]*)*'):
string_parts.append('')
continue
p.commit()
string_parts.append(p(_p_unescape))
p(c)
string_parts[-1] = _re_mstr_trailing_nl.sub('', string_parts[-1])
string_parts[::2] = [_re_mstr_nl.sub(' ', part) for part in string_parts[::2]]
return ''.join(string_parts)
def _p_string(p):
with p:
return p(_p_block_str, '"')
with p:
return p(_p_block_str, "'")
with p:
return p(_p_multiline_str, '"')
return p(_p_multiline_str, "'")
def _p_array_value(p):
with p:
p(_p_nl)
return p(_p_object)
with p:
p(_p_ws)
return p(_p_line_object)
p(_p_ews)
return p(_p_simple_value)
def _p_key(p):
with p:
return p(_p_id)
return p(_p_string)
def _p_flow_kv(p):
k = p(_p_key)
p(_p_ews)
p(':')
with p:
p(_p_nl)
return k, p(_p_object)
with p:
p(_p_ws)
return k, p(_p_line_object)
p(_p_ews)
return k, p(_p_simple_value)
def _p_flow_obj_sep(p):
with p:
p(_p_ews)
p(',')
p(_p_ews)
return
p(_p_nl)
p(_p_ws)
def _p_simple_value(p):
with p:
p('null')
return None
with p:
p('false')
return False
with p:
p('true')
return True
with p:
return int(p('0b[01]+')[2:], 2)
with p:
return int(p('0o[0-7]+')[2:], 8)
with p:
return int(p('0x[0-9a-fA-F]+')[2:], 16)
with p:
return float(p(r'-?(?:[1-9][0-9]*|0)?\.[0-9]+(?:[Ee][\+-]?[0-9]+)?|(?:[1-9][0-9]*|0)(?:\.[0-9]+)?[Ee][\+-]?[0-9]+'))
with p:
return int(p('-?[1-9][0-9]*|0'), 10)
with p:
return p(_p_string)
with p:
p(r'\[')
r = []
with p:
p.set('I', '')
r.append(p(_p_array_value))
with p:
while True:
with p:
p(_p_ews)
p(',')
rr = p(_p_array_value)
if not p:
p(_p_nl)
with p:
rr = p(_p_object)
if not p:
p(_p_ews)
rr = p(_p_simple_value)
r.append(rr)
p.commit()
with p:
p(_p_ews)
p(',')
p(_p_ews)
p(r'\]')
return r
p(r'\{')
r = {}
p(_p_ews)
with p:
p.set('I', '')
k, v = p(_p_flow_kv)
r[k] = v
with p:
while True:
p(_p_flow_obj_sep)
k, v = p(_p_flow_kv)
r[k] = v
p.commit()
p(_p_ews)
with p:
p(',')
p(_p_ews)
p(r'\}')
return r
def _p_line_kv(p):
k = p(_p_key)
p(_p_ws)
p(':')
p(_p_ws)
with p:
p(_p_nl)
p(p.get('I'))
return k, p(_p_indented_object)
with p:
return k, p(_p_line_object)
with p:
return k, p(_p_simple_value)
p(_p_nl)
p(p.get('I'))
p('[ \t]')
p(_p_ws)
return k, p(_p_simple_value)
def _p_line_object(p):
k, v = p(_p_line_kv)
r = { k: v }
with p:
while True:
p(_p_ws)
p(',')
p(_p_ws)
k, v = p(_p_line_kv)
r[k] = v # uniqueness
p.commit()
return r
def _p_object(p):
p.set('I', p.get('I') + p('[ \t]*'))
r = p(_p_line_object)
with p:
while True:
p(_p_ws)
with p:
p(',')
p(_p_nl)
p(p.get('I'))
rr = p(_p_line_object)
r.update(rr) # unqueness
p.commit()
return r
def _p_indented_object(p):
p.set('I', p.get('I') + p('[ \t]'))
return p(_p_object)
def _p_root(p):
with p:
p(_p_nl)
with p:
p.set('I', '')
r = p(_p_object)
p(_p_ws)
with p:
p(',')
if not p:
p(_p_ws)
r = p(_p_simple_value)
p(_p_ews)
p(p.eof)
return r
|
