mirror of https://github.com/t1meshift/js.git
109 lines
3.8 KiB
Python
109 lines
3.8 KiB
Python
from antlr4 import *
|
|
|
|
relativeImport = False
|
|
if __name__ is not None and "." in __name__:
|
|
relativeImport = True
|
|
|
|
|
|
class JavaScriptBaseParser(Parser):
|
|
@staticmethod
|
|
def parser():
|
|
if relativeImport:
|
|
from .JavaScriptParser import JavaScriptParser
|
|
else:
|
|
from JavaScriptParser import JavaScriptParser
|
|
return JavaScriptParser
|
|
|
|
def p(self, s: str) -> bool:
|
|
return self.prev(s)
|
|
|
|
def prev(self, s: str) -> bool:
|
|
return self._input.LT(-1).text == s
|
|
|
|
def n(self, s: str) -> bool:
|
|
return self.next(s)
|
|
|
|
def next(self, s: str) -> bool:
|
|
return self._input.LT(1).text == s
|
|
|
|
def notLineTerminator(self) -> bool:
|
|
JavaScriptParser = self.parser()
|
|
|
|
return not self.here(JavaScriptParser.LineTerminator)
|
|
|
|
def notOpenBraceAndNotFunction(self) -> bool:
|
|
JavaScriptParser = self.parser()
|
|
|
|
nextTokenType = self._input.LT(1).type
|
|
return (
|
|
nextTokenType != JavaScriptParser.OpenBrace
|
|
and nextTokenType != JavaScriptParser.Function
|
|
)
|
|
|
|
def closeBrace(self) -> bool:
|
|
JavaScriptParser = self.parser()
|
|
|
|
return self._input.LT(1).type == JavaScriptParser.CloseBrace
|
|
|
|
def here(self, tokenType: int) -> bool:
|
|
"""
|
|
Returns {@code true} iff on the current index of the parser's
|
|
token stream a token of the given {@code type} exists on the
|
|
{@code HIDDEN} channel.
|
|
:param:type:
|
|
the type of the token on the {@code HIDDEN} channel
|
|
to check.
|
|
:return:{@code true} iff on the current index of the parser's
|
|
token stream a token of the given {@code type} exists on the
|
|
{@code HIDDEN} channel.
|
|
"""
|
|
# Get the token ahead of the current index.
|
|
assert isinstance(self.getCurrentToken(), Token)
|
|
possibleIndexEosToken: Token = self.getCurrentToken().tokenIndex - 1
|
|
ahead = self._input.get(possibleIndexEosToken)
|
|
|
|
# Check if the token resides on the HIDDEN channel and if it's of the
|
|
# provided type.
|
|
return (ahead.channel == Lexer.HIDDEN) and (ahead.type == tokenType)
|
|
|
|
def lineTerminatorAhead(self) -> bool:
|
|
"""
|
|
Returns {@code true} iff on the current index of the parser's
|
|
token stream a token exists on the {@code HIDDEN} channel which
|
|
either is a line terminator, or is a multi line comment that
|
|
contains a line terminator.
|
|
|
|
:return: {@code true} iff on the current index of the parser's
|
|
token stream a token exists on the {@code HIDDEN} channel which
|
|
either is a line terminator, or is a multi line comment that
|
|
contains a line terminator.
|
|
"""
|
|
JavaScriptParser = self.parser()
|
|
|
|
# Get the token ahead of the current index.
|
|
possibleIndexEosToken: Token = self.getCurrentToken().tokenIndex - 1
|
|
ahead: Token = self._input.get(possibleIndexEosToken)
|
|
|
|
if ahead.channel != Lexer.HIDDEN:
|
|
# We're only interested in tokens on the HIDDEN channel.
|
|
return False
|
|
|
|
if ahead.type == JavaScriptParser.LineTerminator:
|
|
# There is definitely a line terminator ahead.
|
|
return True
|
|
|
|
if ahead.type == JavaScriptParser.WhiteSpaces:
|
|
# Get the token ahead of the current whitespaces.
|
|
possibleIndexEosToken = self.getCurrentToken().tokenIndex - 2
|
|
ahead = self._input.get(possibleIndexEosToken)
|
|
|
|
# Get the token's text and type.
|
|
text = ahead.text
|
|
tokenType = ahead.type
|
|
|
|
# Check if the token is, or contains a line terminator.
|
|
return (
|
|
tokenType == JavaScriptParser.MultiLineComment
|
|
and (text.contains("\r") or text.contains("\n"))
|
|
) or (tokenType == JavaScriptParser.LineTerminator)
|