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tokenization.py
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tokenization.py
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from fable \
import unsigned_integer_scan, \
identifier_scan, \
floating_point_scan_after_exponent_char, \
floating_point_scan_after_dot
class token(object):
__slots__ = ["typeid", "ssl", "i_code", "value"]
def __init__(O, typeid, ssl, i_code, value):
O.typeid = typeid
O.ssl = ssl
O.i_code = i_code
O.value = value
def type(O):
return [
"identifier",
"integer",
"hexadecimal",
"real",
"double_precision",
"logical",
"string",
"op",
"complex",
"seq",
"parentheses",
"implied_do",
"power",
"format"][O.typeid]
def is_identifier(O): return O.typeid == 0
def is_integer(O): return O.typeid == 1
def is_hexadecimal(O): return O.typeid == 2
def is_real(O): return O.typeid == 3
def is_double_precision(O): return O.typeid == 4
def is_logical(O): return O.typeid == 5
def is_string(O): return O.typeid == 6
def is_op(O): return O.typeid == 7
def is_complex(O): return O.typeid == 8
def is_seq(O): return O.typeid == 9
def is_parentheses(O): return O.typeid == 10
def is_implied_do(O): return O.typeid == 11
def is_power(O): return O.typeid == 12
def is_format(O): return O.typeid == 13
def is_identifier_or_scalar_number(O):
return O.typeid <= 4
def is_op_with(O, value):
return O.typeid == 7 and O.value == value
def is_unary_plus_or_minus(O):
return O.typeid == 7 and O.value in ["+", "-"]
def is_seq_or_parentheses(O):
return 9 <= O.typeid <= 10
def is_seq_or_parentheses_or_implied_do(O):
return 9 <= O.typeid <= 11
def stmt_location(O):
return O.ssl.stmt_location(i=O.i_code)
def format_error(O, msg, prefix=""):
return O.ssl.format_error(msg=msg, i=O.i_code, prefix=prefix)
def raise_error(O, msg, ErrorType=None):
O.ssl.raise_error(msg=msg, i=O.i_code, ErrorType=ErrorType)
def raise_syntax_error(O):
O.ssl.raise_syntax_error(i=O.i_code)
def raise_semantic_error(O, msg=None):
O.ssl.raise_semantic_error(msg=msg, i=O.i_code)
def raise_not_supported(O):
O.raise_error(
msg="Sorry: not supported",
ErrorType=RuntimeError)
def raise_internal_error(O):
O.ssl.raise_internal_error(i=O.i_code)
def raise_if_not_identifier(O):
i = identifier_scan(code=O.value)
if (i < 0 or i != len(O.value)):
O.raise_error(msg="Not an identifier: %s" % repr(O.value))
def raise_missing_closing(O):
O.raise_error(msg='Missing a closing ")"')
def raise_missing_opening(O):
O.raise_error(msg='Closing ")" without a matching opening parenthesis')
def fquote(O):
return "'" + O.value.replace("'", "''") + "'"
def tk_identifier(ssl, i_code, value): return token(0, ssl, i_code, value)
def tk_integer(ssl, i_code, value): return token(1, ssl, i_code, value)
def tk_hexadecimal(ssl, i_code, value): return token(2, ssl, i_code, value)
def tk_real(ssl, i_code, value): return token(3, ssl, i_code, value)
def tk_double_precision(ssl, i_code, value): return token(4, ssl, i_code, value)
def tk_logical(ssl, i_code, value): return token(5, ssl, i_code, value)
def tk_string(ssl, i_code, value): return token(6, ssl, i_code, value)
def tk_op(ssl, i_code, value): return token(7, ssl, i_code, value)
def tk_complex(ssl, i_code, value): return token(8, ssl, i_code, value)
def tk_seq(ssl, i_code, value): return token(9, ssl, i_code, value)
def tk_parentheses(ssl, i_code, value): return token(10, ssl, i_code, value)
def tk_implied_do(ssl, i_code, value): return token(11, ssl, i_code, value)
def tk_power(ssl, i_code, value): return token(12, ssl, i_code, value)
def tk_format(ssl, i_code, value): return token(13, ssl, i_code, value)
class ssl_iterator(object):
"stripped source line iterator"
__slots__ = ["ssl", "start", "stop", "i", "buffer"]
def __init__(O, ssl, start, stop=None):
O.ssl = ssl
O.start = start
if (stop is None): O.stop = len(ssl.code)
else: O.stop = stop
O.i = start
O.buffer = []
def __iter__(O): return O
def next(O):
tok = O.get(optional=True)
if (tok is None):
raise StopIteration
return tok
def get(O, optional=False):
ssl = O.ssl
code = ssl.code
stop = O.stop
def return_none():
if (not optional):
if (stop == 0): ssl.raise_syntax_error()
else: ssl.raise_syntax_error(i=stop-1)
O.i = None
return None
if (len(O.buffer) != 0):
O.i, result = O.buffer.pop(0)
if (result is None):
return_none()
return result
if (O.i is None):
if (optional):
return None
ssl.raise_internal_error(i=stop-1)
while (O.i < stop):
i_code = O.i
c = code[i_code]
if ("=<>".find(c) >= 0):
if (code.startswith("=", i_code+1)):
O.i += 2
return tk_op(ssl=ssl, i_code=i_code, value=code[i_code:i_code+2])
O.i += 1
return tk_op(ssl=ssl, i_code=i_code, value=c)
if ("(),:+-".find(c) >= 0):
O.i += 1
return tk_op(ssl=ssl, i_code=i_code, value=c)
if (c == "'"):
O.i += 1
return tk_string(
ssl=ssl,
i_code=i_code,
value=ssl.strings[ssl.string_indices.index(i_code)])
if (c == "x" and code.startswith("'", i_code+1)):
O.i += 2
return tk_hexadecimal(
ssl=ssl,
i_code=i_code,
value=ssl.strings[ssl.string_indices.index(i_code+1)])
j = identifier_scan(code=code, start=i_code)
if (j > 0):
O.i = j
return tk_identifier(ssl=ssl, i_code=i_code, value=code[i_code:j])
if (c == "*"):
if (code.startswith("*", i_code+1)):
O.i += 2
return tk_op(ssl=ssl, i_code=i_code, value="**")
O.i += 1
return tk_op(ssl=ssl, i_code=i_code, value="*")
if (c == "/"):
if (code.startswith("/", i_code+1)):
O.i += 2
return tk_op(ssl=ssl, i_code=i_code, value="//")
if (code.startswith("=", i_code+1)):
O.i += 2
return tk_op(ssl=ssl, i_code=i_code, value="/=")
O.i += 1
return tk_op(ssl=ssl, i_code=i_code, value="/")
if (c == "."):
return O.__after_dot(i_fld=i_code, i_dot=i_code)
j = unsigned_integer_scan(code=code, start=i_code, stop=stop)
if (j > 0):
if (j == stop):
O.i = j
return tk_integer(ssl=ssl, i_code=i_code, value=code[i_code:j])
cj = code[j]
if (cj == "."):
if (j + 1 == stop):
O.i = stop
return tk_real(ssl=ssl, i_code=i_code, value=code[i_code:stop])
return O.__after_dot(i_fld=i_code, i_dot=j)
if (cj == "e" or cj == "d"):
k = floating_point_scan_after_exponent_char(
code=code, start=j+1, stop=stop)
if (k < 0):
ssl.raise_error(
msg="Invalid floating-point literal", i=j+1)
O.i = k
if (cj == "d"):
return tk_double_precision(
ssl=ssl, i_code=i_code, value=code[i_code:k])
return tk_real(ssl=ssl, i_code=i_code, value=code[i_code:k])
O.i = j
return tk_integer(ssl=ssl, i_code=i_code, value=code[i_code:j])
ssl.raise_syntax_error(i=i_code)
return_none()
def __after_dot(O, i_fld, i_dot):
ssl = O.ssl
stop = O.stop
if (i_dot + 1 == stop):
ssl.raise_error(
msg="Expression unexpectedly ends with a dot", i=i_dot)
code = ssl.code
csw = code.startswith
c = code[i_dot+1]
if (c == "a"):
if (not csw("nd.", i_dot+2)):
ssl.raise_syntax_error(i=i_dot+2)
tok = tk_op(ssl=ssl, i_code=i_dot, value=".and.")
if (i_dot == i_fld):
O.i = i_dot+5
return tok
O.buffer.append((i_dot+5, tok))
O.i = i_dot
return tk_integer(ssl=ssl, i_code=i_fld, value=code[i_fld:i_dot])
if (c == "o"):
if (not csw("r.", i_dot+2)):
ssl.raise_syntax_error(i=i_dot+2)
tok = tk_op(ssl=ssl, i_code=i_dot, value=".or.")
if (i_dot == i_fld):
O.i = i_dot+4
return tok
O.buffer.append((i_dot+4, tok))
O.i = i_dot
return tk_integer(ssl=ssl, i_code=i_fld, value=code[i_fld:i_dot])
if (c == "e" or c == "d"):
if (c == "e"):
if (csw("q.", i_dot+2)):
tok = tk_op(ssl=ssl, i_code=i_dot, value=".eq.")
if (i_dot == i_fld):
O.i = i_dot+4
return tok
O.buffer.append((i_dot+4, tok))
O.i = i_dot
return tk_integer(ssl=ssl, i_code=i_fld, value=code[i_fld:i_dot])
if (csw("qv.", i_dot+2)):
tok = tk_op(ssl=ssl, i_code=i_dot, value=".eqv.")
if (i_dot == i_fld):
O.i = i_dot+5
return tok
O.buffer.append((i_dot+5, tok))
return tk_integer(ssl=ssl, i_code=i_fld, value=code[i_fld:i_dot])
if (i_dot == i_fld):
ssl.raise_syntax_error(i=i_dot+1)
j = floating_point_scan_after_exponent_char(
code=code, start=i_dot+2, stop=stop)
if (j < 0):
ssl.raise_syntax_error(i=i_dot+1)
O.i = j
if (c == "d"):
return tk_double_precision(
ssl=ssl, i_code=i_fld, value=code[i_fld:j])
return tk_real(ssl=ssl, i_code=i_fld, value=code[i_fld:j])
if (c == "f"):
if (not csw("alse.", i_dot+2) or i_dot != i_fld):
ssl.raise_syntax_error(i=i_dot+1)
O.i = i_dot+7
return tk_logical(ssl=ssl, i_code=i_dot, value=".false.")
if (c == "t"):
if (not csw("rue.", i_dot+2) or i_dot != i_fld):
ssl.raise_syntax_error(i=i_dot+1)
O.i = i_dot+6
return tk_logical(ssl=ssl, i_code=i_dot, value=".true.")
if (c == "n"):
if (csw("ot.", i_dot+2)):
if (i_dot != i_fld):
ssl.raise_syntax_error(i=i_dot+1)
O.i = i_dot+5
return tk_op(ssl=ssl, i_code=i_dot, value=".not.")
if (csw("e.", i_dot+2)):
tok = tk_op(ssl=ssl, i_code=i_dot, value=".ne.")
if (i_dot == i_fld):
O.i = i_dot+4
return tok
O.buffer.append((i_dot+4, tok))
O.i = i_dot
return tk_integer(ssl=ssl, i_code=i_fld, value=code[i_fld:i_dot])
if (csw("eqv.", i_dot+2)):
tok = tk_op(ssl=ssl, i_code=i_dot, value=".neqv.")
if (i_dot == i_fld):
O.i = i_dot+6
return tok
O.buffer.append((i_dot+6, tok))
O.i = i_dot
return tk_integer(ssl=ssl, i_code=i_fld, value=code[i_fld:i_dot])
ssl.raise_syntax_error(i=i_dot+1)
if (c == "g" or c == "l"):
if (not csw("t.", i_dot+2) and not csw("e.", i_dot+2)):
ssl.raise_syntax_error(i=i_dot+1)
tok = tk_op(ssl=ssl, i_code=i_dot, value=code[i_dot:i_dot+4])
if (i_dot == i_fld):
O.i = i_dot+4
return tok
O.buffer.append((i_dot+4, tok))
O.i = i_dot
return tk_integer(ssl=ssl, i_code=i_fld, value=code[i_fld:i_dot])
j = floating_point_scan_after_dot(code=code, start=i_dot+1, stop=stop)
if (j < 0):
ssl.raise_syntax_error(i=i_dot+1)
O.i = j
if (code.find("d", i_dot+1, O.i) < 0): tk_type = tk_real
else: tk_type = tk_double_precision
return tk_type(ssl=ssl, i_code=i_fld, value=code[i_fld:j])
def look_ahead(O, optional=False):
if (len(O.buffer) != 0):
return O.buffer[0][1]
prev_i = O.i
tok = O.get(optional=optional)
O.buffer.append((O.i, tok))
O.i = prev_i
return tok
def get_complex_literal(O, opening_token):
assert opening_token.ssl is O.ssl
invalid_message = "Invalid complex number literal"
result = [opening_token]
def get_part():
tok = O.get()
sign_tok = None
if (tok.is_op()):
if (tok.value not in ["+", "-"]):
tok.raise_error(msg=invalid_message)
sign_tok = tok
tok = O.get()
if (not tok.is_identifier_or_scalar_number()):
tok.raise_error(msg=invalid_message)
return (sign_tok, tok)
result.append(get_part())
tok = O.get()
if (not tok.is_op_with(value=",")):
tok.raise_error(msg=invalid_message)
result.append(get_part())
tok = O.get()
if (not tok.is_op_with(value=")")):
tok.raise_error(msg=invalid_message)
result.append(tok)
return tk_complex(ssl=O.ssl, i_code=opening_token.i_code, value=result)
def get_inside_parentheses(O, opening_token):
tok = O.get(optional=True)
if (tok is None):
opening_token.raise_missing_closing()
return tok
def collect_comma_separated_identifiers(O,
callback,
one_required=False,
enable_common=False):
n_list = 0
while True:
tok = O.get(optional=not one_required)
if (tok is None):
break
if (tok.is_identifier()):
callback(tok)
elif (not enable_common):
tok.raise_syntax_error()
else:
if (not tok.is_op_with("/")):
tok.raise_syntax_error()
tok = O.get()
if (not tok.is_identifier()):
tok.raise_syntax_error()
tok = O.get()
if (not tok.is_op_with("/")):
tok.raise_syntax_error()
# SAVE of COMMON are ignored (considered redundant)
n_list += 1
tok = O.get(optional=True)
if (tok is None):
break
if (not tok.is_op_with(value=",")):
tok.raise_syntax_error()
one_required = True
return n_list
def collect_comma_separated_expressions(O,
callback,
opening_token=None,
first_get_optional=True,
stop_after_given_number_of_commas=None,
enable_implied_do=0):
tokens = tk_seq(ssl=O.ssl, i_code=O.i, value=[])
tapp = tokens.value.append
last_comma = None
n_callbacks = 0
i_assignment_op = None
get_optional = first_get_optional
while True:
tok = O.get(optional=get_optional)
get_optional = True
if (tok is None):
if (opening_token is not None):
opening_token.raise_missing_closing()
if (len(tokens.value) == 0):
if (last_comma is None):
return None
last_comma.raise_syntax_error()
callback(tokens)
return None
if (tok.is_op()):
tv = tok.value
if (tv ==")"):
if (opening_token is None):
tok.raise_missing_opening()
if (i_assignment_op is None):
if (enable_implied_do == 2):
tok.raise_syntax_error()
elif (i_assignment_op == n_callbacks):
tok.raise_syntax_error()
if (len(tokens.value) == 0):
if (last_comma is None):
return i_assignment_op
last_comma.raise_syntax_error()
callback(tokens)
return i_assignment_op
if (tv == ","):
if (len(tokens.value) == 0):
tok.raise_syntax_error()
callback(tokens)
n_callbacks += 1
if (stop_after_given_number_of_commas is not None
and n_callbacks == stop_after_given_number_of_commas):
return
tokens = tk_seq(ssl=O.ssl, i_code=O.i, value=[])
tapp = tokens.value.append
last_comma = tok
elif (tv == "("):
nested_tokens = []
if (O.collect_comma_separated_expressions(
callback=nested_tokens.append,
opening_token=tok,
enable_implied_do=int(enable_implied_do!=0)) is None):
tk_type = tk_parentheses
else:
tk_type = tk_implied_do
tapp(tk_type(
ssl=tok.ssl, i_code=tok.i_code, value=nested_tokens))
elif (tv == "="):
if ( opening_token is None
or enable_implied_do == 0
or n_callbacks == 0
or i_assignment_op is not None
or len(tokens.value) != 1
or not tokens.value[0].is_identifier()):
tok.raise_syntax_error()
i_assignment_op = n_callbacks
tapp(tok)
else:
tapp(tok)
else:
tapp(tok)
def collect_to_matching_parenthesis(O, callback, opening_token):
nested_tokens = []
O.collect_comma_separated_expressions(
callback=nested_tokens.append,
opening_token=opening_token)
callback(tk_parentheses(
ssl=opening_token.ssl, i_code=opening_token.i_code, value=nested_tokens))
def get_implied_do(O, opening_token):
result = []
O.collect_comma_separated_expressions(
callback=result.append,
opening_token=opening_token,
enable_implied_do=2)
return tk_implied_do(ssl=O.ssl, i_code=opening_token.i_code, value=result)
def remove_redundant_parentheses(tokens):
result = []
for tok in tokens:
def handle_seq_with_one_parentheses():
if (tok.is_seq()):
tv = tok.value
if (len(tv) == 1):
inner_tok = tv[0]
if (inner_tok.is_parentheses()):
result.extend(
remove_redundant_parentheses(tokens=inner_tok.value))
return
return result.append(tok)
handle_seq_with_one_parentheses()
return result
def group_power(tokens):
result = []
i_tok = 0
n_toks = len(tokens)
while (i_tok < n_toks):
tok = tokens[i_tok]; i_tok += 1
if (tok.is_op_with(value="**")):
if (len(result) == 0):
tok.raise_syntax_error()
if (i_tok == len(tokens)):
tok.raise_syntax_error()
if ( result[-1].is_parentheses()
and len(result) != 1
and result[-2].is_identifier()):
base_tok = tk_seq(
ssl=result[-2].ssl,
i_code=result[-2].i_code,
value=result[-2:])
result.pop()
else:
base_tok = result[-1]
result.pop()
exponent_tok = tokens[i_tok]; i_tok += 1
if ( exponent_tok.is_identifier()
and i_tok < len(tokens)
and tokens[i_tok].is_parentheses()):
next_tok = tokens[i_tok]; i_tok += 1
exponent_tok = tk_seq(
ssl=exponent_tok.ssl,
i_code=exponent_tok.i_code,
value=[exponent_tok, next_tok])
result.append(tk_power(
ssl=exponent_tok.ssl,
i_code=exponent_tok.i_code,
value=[base_tok, exponent_tok]))
else:
result.append(tok)
return result
class implied_do_info(object):
__slots__ = ["dlist_size", "id_tok", "fls_tokens"]
def __init__(O, tokens):
assert len(tokens) >= 3
def get_first_tokens(i):
tok = tokens[i]
if (not tok.is_seq()): return False
tv = tok.value
if (len(tv) < 3): return False
if (not tv[0].is_identifier()): return False
if (not tv[1].is_op_with(value="=")): return False
O.dlist_size = len(tokens) + i
O.id_tok = tv[0]
O.fls_tokens = [tk_seq(ssl=tv[2].ssl, i_code=tv[2].i_code, value=tv[2:])]
return True
if (get_first_tokens(i=-2)):
O.fls_tokens.append(tokens[-1])
else:
assert get_first_tokens(i=-3)
O.fls_tokens.extend(tokens[-2:])
def tok_seq_is_star(tok_seq):
return (len(tok_seq.value) == 1 and tok_seq.value[0].is_op_with(value="*"))
def tokens_as_strings(tokens, result=None):
if (result is None):
result = []
for tok in tokens:
if (tok.is_seq()):
result.append("[")
tokens_as_strings(tokens=tok.value, result=result)
result.append("]")
elif (tok.is_parentheses()):
result.append("(")
tokens_as_strings(tokens=tok.value, result=result)
result.append(")")
elif (tok.is_implied_do()):
result.append("{")
tokens_as_strings(tokens=tok.value, result=result)
result.append("}")
elif (tok.is_string()):
result.append(tok.fquote())
elif (tok.is_power()):
result.append("power(")
tokens_as_strings(tokens=tok.value, result=result)
result.append(")")
elif (tok.is_format()):
result.append("format(" + tok.fquote() + ")")
else:
result.append(tok.value)
return result
def tokens_as_string(tokens):
return " ".join(tokens_as_strings(tokens=tokens))
def tokens_as_python_code(tokens, result=None, allow_power=True):
join_result = (result is None)
if (join_result):
result = []
for tok in tokens:
if (tok.is_seq()):
if (tokens_as_python_code(tokens=tok.value, result=result) is None):
return None
elif (tok.is_parentheses()):
result.append("(")
if (tokens_as_python_code(tokens=tok.value, result=result) is None):
return None
result.append(")")
elif (tok.is_implied_do()):
return None
elif (tok.is_string()):
return None
elif (tok.is_power()):
return None
elif (tok.is_format()):
return None
elif (not allow_power and tok.is_op_with(value="**")):
return None
else:
result.append(tok.value)
if (join_result):
return " ".join(result)
return result
def search_for_id_tokens(callback, tokens, with_next_token):
for i_tok,tok in enumerate(tokens):
if (tok.is_seq_or_parentheses_or_implied_do()):
search_for_id_tokens(
callback=callback, tokens=tok.value, with_next_token=with_next_token)
elif (tok.is_identifier()):
if (not with_next_token):
callback(tok)
else:
next_tok = None
j_tok = i_tok + 1
if (j_tok != len(tokens)):
next_tok = tokens[j_tok]
callback(tok, next_tok)
def extract_identifiers(tokens, result=None):
if (result is None): result = []
search_for_id_tokens(
callback=result.append, tokens=tokens, with_next_token=False)
return result
def search_for_data_or_read_target_tokens(callback, tokens):
for tok in tokens:
assert tok.is_seq()
if (len(tok.value) == 0):
continue
first_target_tok = tok.value[0]
if (first_target_tok.is_identifier()):
callback(tok=first_target_tok)
elif (first_target_tok.is_implied_do()):
idi = implied_do_info(tokens=first_target_tok.value)
search_for_data_or_read_target_tokens(
callback=callback, tokens=first_target_tok.value[:idi.dlist_size])
class fss_iterator(object):
"format string stripped iterator"
__slots__ = ["fss", "i"]
def __init__(O, fss):
O.fss = fss
O.i = 0
def __iter__(O): return O
def next(O):
tok = O.get()
if (tok is None):
raise StopIteration
return tok
def get(O):
fss = O.fss
code = fss.code
stop = len(code)
assert O.i is not None
def raise_invalid():
fss.raise_error(msg="Invalid FORMAT specification", i=min(stop-1, O.i))
while (O.i < stop):
i_code = O.i
c = code[i_code]
if (c == ","):
O.i += 1
continue
if (c == "x"):
O.i += 1
return tk_format(ssl=fss, i_code=i_code, value="1x")
if ("():/$".find(c) >= 0):
O.i += 1
return tk_op(ssl=fss, i_code=i_code, value=c)
if (c == "'"):
O.i += 1
return tk_string(
ssl=fss,
i_code=i_code,
value=fss.strings[fss.string_indices.index(i_code)])
if (c == "+" or c == "-"):
j = unsigned_integer_scan(code=code, start=i_code+1, stop=stop)
if (j < 0 or not code.startswith("p", j)):
raise_invalid()
O.i = j + 1
return tk_format(
ssl=fss,
i_code=i_code,
value=code[i_code:O.i])
j = unsigned_integer_scan(code=code, start=i_code, stop=stop)
if (j > 0):
O.i = j
if (code.startswith("h", O.i)):
# extract Hollerith edit descriptor if it did not confuse the
# previous ignorant parsing algorithms
sl, i_text = fss.text_location(i=O.i)
assert sl.text[i_text].lower() == "h"
i_text += 1
nh = int(code[i_code:j])
j_text = i_text + nh
tv = sl.text[i_text:j_text]
if (len(tv) != nh):
raise RuntimeError(fss.format_error(
i=i_code,
msg="FATAL: Not supported: FORMAT Hollerith edit descriptor"
" spanning continuation lines"))
if (tv.find("'") >= 0 or tv.find('"') >= 0):
raise RuntimeError(fss.format_error(
i=i_code,
msg="FATAL: Not supported:"
" FORMAT Hollerith edit descriptor with quotes"))
while (O.i < stop):
sl, i_text = fss.text_location(i=O.i)
if (i_text >= j_text):
break
O.i += 1
return tk_string(ssl=fss, i_code=i_code, value=tv)
if (code.startswith("x", O.i) or code.startswith("p", O.i)):
O.i += 1
return tk_format(ssl=fss, i_code=i_code, value=code[i_code:O.i])
return tk_integer(ssl=fss, i_code=i_code, value=code[i_code:j])
if ("defgiz".find(c) >= 0):
j = unsigned_integer_scan(code=code, start=i_code+1, stop=stop)
if (j > 0):
O.i = j
if (code.startswith(".", j)):
j = unsigned_integer_scan(code=code, start=j+1, stop=stop)
if (j < 0):
raise_invalid()
O.i = j
return tk_format(ssl=fss, i_code=i_code, value=code[i_code:O.i])
if (c == "a" or c == "l"):
O.i += 1
j = unsigned_integer_scan(code=code, start=i_code+1, stop=stop)
if (j > 0):
O.i = j
return tk_format(ssl=fss, i_code=i_code, value=code[i_code:O.i])
if (code.startswith("bn", i_code) or code.startswith("bz", i_code)):
O.i += 2
return tk_format(ssl=fss, i_code=i_code, value=code[i_code:O.i])
if (c == "s"):
O.i += 1
if (code.startswith("p", O.i) or code.startswith("s", O.i)):
O.i += 1
return tk_format(ssl=fss, i_code=i_code, value=code[i_code:O.i])
if (c == "t"):
O.i += 1
if (code.startswith("l", O.i) or code.startswith("r", O.i)):
O.i += 1
j = unsigned_integer_scan(code=code, start=O.i, stop=stop)
if (j < 0):
raise_invalid()
O.i = j
return tk_format(ssl=fss, i_code=i_code, value=code[i_code:O.i])
raise_invalid()
O.i = None
return None
def get_statement_label_token(tokens):
assert len(tokens) != 0
tok = tokens[0]
if (len(tokens) != 1 or not tok.is_integer()):
tok.raise_error(msg="Invalid statement label")
return tok
def fmt_tokens_as_string(tokens, comma=","):
result = []
def result_ends_with_comma():
return (len(result) != 0 and result[-1] == comma)
for tok in tokens:
if (tok.is_integer()):
result.append(tok.value)
elif (tok.is_string()):
result.append("'" + tok.value.replace("'","''") + "'")
result.append(comma)
elif (tok.is_format()):
result.append(tok.value)
result.append(comma)
elif (tok.is_op()):
tv = tok.value
if (tv == "(" or tv == ")"):
if (result_ends_with_comma()):
result.pop()
result.append(tv)
if (tv == ")"): result.append(comma)
else:
result.append(tv)
result.append(comma)
else:
raise AssertionError
if (result_ends_with_comma()):
result.pop()
return "".join(result)