def repeat(tokens):
if tokens.length() == 1:
return tokens.value()
try:
operand, operator = tokens
except Exception as cause:
Log.error("not expected", cause=cause)
mode = operator["mode"]
if not mode:
if operator["exact"]:
return Many(operand, PLAIN_ENGINE, exact=int(operator["exact"]))
else:
return Many(operand,
PLAIN_ENGINE,
min_match=int(operator["min"]),
max_match=int(operator["max"]))
elif mode in "*?":
return ZeroOrMore(operand, PLAIN_ENGINE)
elif mode in "+?":
return OneOrMore(operand, PLAIN_ENGINE)
elif mode == "?":
return Optional(operand, PLAIN_ENGINE)
else:
Log.error("not expected")
def makeHTMLTags(tagStr, suppress_LT=Suppress("<"), suppress_GT=Suppress(">")):
"""Helper to construct opening and closing tag expressions for HTML,
given a tag name. Matches tags in either upper or lower case,
attributes with namespaces and with quoted or unquoted values.
"""
if isinstance(tagStr, text):
resname = tagStr
tagStr = Keyword(tagStr, caseless=True)
else:
resname = tagStr.parser_name
tagAttrName = Word(alphas, alphanums + "_-:")
tagAttrValue = quotedString.addParseAction(removeQuotes) | Word(
printables, exclude=">"
)
simpler_name = "".join(resname.replace(":", " ").title().split())
openTag = (
(
suppress_LT
+ tagStr("tag")
+ OpenDict(ZeroOrMore(Group(
tagAttrName.addParseAction(downcaseTokens)
+ Optional(Suppress("=") + tagAttrValue)
)))
+ Optional(
"/", default=[False]
)("empty").addParseAction(lambda t, l, s: t[0] == "/")
+ suppress_GT
)
.set_token_name("start" + simpler_name)
.set_parser_name("<%s>" % resname)
)
closeTag = (
Combine(Literal("</") + tagStr + ">")
.set_token_name("end" + simpler_name)
.set_parser_name("</%s>" % resname)
)
# openTag.tag = resname
# closeTag.tag = resname
# openTag.tag_body = SkipTo(closeTag)
return openTag, closeTag
def repeat(tokens):
if tokens.length() == 1:
return tokens.value()
operand, operator = tokens
mode = operator["mode"]
if not mode:
if operator["exact"]:
return Many(operand, exact=int(operator["exact"]))
else:
return Many(
operand, min_match=int(operator["min"]), max_match=int(operator["max"])
)
elif mode in "*?":
return ZeroOrMore(operand)
elif mode in "+?":
return OneOrMore(operand)
elif mode == "?":
return Optional(operand)
else:
Log.error("not expected")
def indentedBlock(blockStatementExpr, indent=True):
"""Helper method for defining space-delimited indentation blocks,
such as those used to define block statements in Python source code.
Parameters:
- blockStatementExpr - expression defining syntax of statement that
is repeated within the indented block
- indentStack - list created by caller to manage indentation stack
(multiple statementWithIndentedBlock expressions within a single
grammar should share a common indentStack)
- indent - boolean indicating whether block must be indented beyond
the current level; set to False for block of left-most
statements (default= ``True``)
A valid block must contain at least one ``blockStatement``.
"""
blockStatementExpr.engine.add_ignore("\\" + LineEnd())
PEER = Forward()
DEDENT = Forward()
def _reset_stack(p=None, l=None, s=None, ex=None):
oldCol, oldPeer, oldDedent = _indent_stack.pop()
PEER << oldPeer
DEDENT << oldDedent
def peer_stack(expectedCol):
def output(t, l, s):
if l >= len(s):
return
curCol = col(l, s)
if curCol != expectedCol:
if curCol > expectedCol:
raise ParseException(t.type, s, l, "illegal nesting")
raise ParseException(t.type, l, s, "not a peer entry")
return output
def dedent_stack(expectedCol):
def output(t, l, s):
if l >= len(s):
return
curCol = col(l, s)
if curCol not in (i for i, _, _ in _indent_stack):
raise ParseException(s, l, "not an unindent")
if curCol < _indent_stack[-1][0]:
oldCol, oldPeer, oldDedent = _indent_stack.pop()
PEER << oldPeer
DEDENT << oldDedent
return output
def indent_stack(t, l, s):
curCol = col(l, s)
if curCol > _indent_stack[-1][0]:
PEER << Empty().addParseAction(peer_stack(curCol))
DEDENT << Empty().addParseAction(dedent_stack(curCol))
_indent_stack.append((curCol, PEER, DEDENT))
else:
raise ParseException(t.type, l, s, "not a subentry")
def nodent_stack(t, l, s):
curCol = col(l, s)
if curCol == _indent_stack[-1][0]:
PEER << Empty().addParseAction(peer_stack(curCol))
DEDENT << Empty().addParseAction(dedent_stack(curCol))
_indent_stack.append((curCol, PEER, DEDENT))
else:
raise ParseException(t.type, s, l, "not a subentry")
NL = OneOrMore(LineEnd().suppress())
INDENT = Empty().addParseAction(indent_stack)
NODENT = Empty().addParseAction(nodent_stack)
if indent:
smExpr = Group(
Optional(NL)
+ INDENT
+ OneOrMore(PEER + Group(blockStatementExpr) + Optional(NL))
+ DEDENT
)
else:
smExpr = Group(
Optional(NL)
+ NODENT
+ OneOrMore(PEER + Group(blockStatementExpr) + Optional(NL))
+ DEDENT
)
return smExpr.setFailAction(_reset_stack).set_parser_name("indented block")
restOfLine = Regex(r"[^\n]*").set_parser_name("rest of line")
dblSlashComment = Regex(r"//(?:\\\n|[^\n])*").set_parser_name("// comment")
cppStyleComment = Combine(
Regex(r"/\*(?:[^*]|\*(?!/))*") + "*/" | dblSlashComment
).set_parser_name("C++ style comment")
javaStyleComment = cppStyleComment
pythonStyleComment = Regex(r"#[^\n]*").set_parser_name("Python style comment")
_commasepitem = (
Combine(OneOrMore(
Word(printables, exclude=",")
+ Optional(Word(" \t") + ~Literal(",") + ~LineEnd())
))
.addParseAction(lambda t: text(t).strip())
.set_parser_name("commaItem")
)
commaSeparatedList = delimitedList(Optional(
quotedString | _commasepitem, default=""
)).set_parser_name("commaSeparatedList")
convertToInteger = tokenMap(int)
convertToFloat = tokenMap(float)
integer = Word(nums).set_parser_name("integer").addParseAction(convertToInteger)
hex_integer = (
Suppress(opener) + ZeroOrMore(ret | content) + Suppress(closer))
ret.set_parser_name("nested %s%s expression" % (opener, closer))
return ret
with Engine(""):
_escapedPunc = Word("\\", r"\[]-*.$+^?()~ ",
exact=2).addParseAction(lambda t, l, s: t[0][1])
_escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").addParseAction(
lambda t: unichr(int(t[0].lstrip("\\").lstrip("0").lstrip("xX"), 16)))
_escapedOctChar = Regex(r"\\0[0-7]+").addParseAction(
lambda t, l, s: unichr(int(t[0][1:], 8)))
_singleChar = (_escapedPunc | _escapedHexChar | _escapedOctChar
| CharsNotIn(r"\]", exact=1))
_charRange = Group(_singleChar + Suppress("-") + _singleChar)
_reBracketExpr = ("[" + Optional("^").set_token_name("negate") + Group(
OneOrMore(_charRange | _singleChar)).set_token_name("body") + "]")
def srange(s):
r"""Helper to easily define string ranges for use in Word
construction. Borrows syntax from regexp '[]' string range
definitions::
srange("[0-9]") -> "0123456789"
srange("[a-z]") -> "abcdefghijklmnopqrstuvwxyz"
srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_"
The input string must be enclosed in []'s, and the returned string
is the expanded character set joined into a single string. The
values enclosed in the []'s may be:
def __or__(self, other):
if other is Ellipsis:
return _PendingSkip(Optional(self))
return MatchFirst([self, engine.CURRENT.normalize(other)]).streamline()
escapedHexChar = Combine(
(Literal("\\0x") | Literal("\\x") | Literal("\\X")) # lookup literals is faster
+ OneOrMore(Char(hexnums))
).addParseAction(hex_to_char)
escapedOctChar = Combine(
Literal("\\0") + OneOrMore(Char("01234567"))
).addParseAction(lambda t: Literal(unichr(int(t.value()[2:], 8))))
singleChar = escapedHexChar | escapedOctChar | escapedChar | plainChar
charRange = Group(singleChar("min") + "-" + singleChar("max")).addParseAction(to_range)
brackets = (
"["
+ Optional("^")("negate")
+ OneOrMore(Group(charRange | singleChar | macro)("body"))
+ "]"
).addParseAction(to_bracket)
#########################################################################################
# REGEX
regex = Forward()
line_start = Literal("^").addParseAction(lambda: LineStart())
line_end = Literal("$").addParseAction(lambda: LineEnd())
word_edge = Literal("\\b").addParseAction(lambda: NotAny(any_wordchar))
simple_char = Word(
printables, exclude=r".^$*+{}[]\|()"
).addParseAction(lambda t: Literal(t.value()))
esc_char = ("\\" + AnyChar()).addParseAction(lambda t: Literal(t.value()[1]))
escapedHexChar = Combine((Literal("\\0x") | Literal("\\x")
| Literal("\\X")) # lookup literals is faster
+
OneOrMore(Char(hexnums))).addParseAction(hex_to_char)
escapedOctChar = Combine(Literal("\\0") +
OneOrMore(Char("01234567"))).addParseAction(
lambda t: Literal(unichr(int(t.value()[2:], 8))))
singleChar = escapedHexChar | escapedOctChar | escapedChar | plainChar
charRange = Group(singleChar("min") + "-" +
singleChar("max")).addParseAction(to_range)
brackets = ("[" + Optional("^")("negate") +
OneOrMore(Group(charRange | singleChar | macro)("body")) +
"]").addParseAction(to_bracket)
#########################################################################################
# REGEX
regex = Forward()
line_start = Literal("^").addParseAction(lambda: LineStart())
line_end = Literal("$").addParseAction(lambda: LineEnd())
word_edge = Literal("\\b").addParseAction(lambda: NotAny(any_wordchar))
simple_char = Word(
printables,
exclude=r".^$*+{}[]\|()").addParseAction(lambda t: Literal(t.value()))
esc_char = ("\\" + AnyChar()).addParseAction(lambda t: Literal(t.value()[1]))
escapedHexChar = Combine(
(Literal("\\0x") | Literal("\\x")
| Literal("\\X")) # lookup literals is faster
+ OneOrMore(Char(hexnums), PLAIN_ENGINE)).addParseAction(hex_to_char)
escapedOctChar = Combine(
Literal("\\0") + OneOrMore(Char("01234567"), PLAIN_ENGINE)).addParseAction(
lambda t: Literal(unichr(int(t.value()[2:], 8))))
singleChar = escapedHexChar | escapedOctChar | escapedChar | plainChar
charRange = Group(singleChar("min") + "-" +
singleChar("max")).addParseAction(to_range)
brackets = (
"[" + Optional("^", PLAIN_ENGINE)("negate") +
OneOrMore(Group(charRange | singleChar | macro)("body"), PLAIN_ENGINE) +
"]").addParseAction(to_bracket)
#########################################################################################
# REGEX
regex = Forward()
line_start = Literal("^").addParseAction(lambda: LineStart())
line_end = Literal("$").addParseAction(lambda: LineEnd())
word_edge = Literal("\\b").addParseAction(lambda: NotAny(any_wordchar))
simple_char = Word(
printables,
exclude=r".^$*+{}[]\|()").addParseAction(lambda t: Literal(t.value()))
esc_char = ("\\" + AnyChar()).addParseAction(lambda t: Literal(t.value()[1]))
