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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Python LPeg lexer.
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'python'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, '#' * l.nonnewline_esc^0)
-- Strings.
local sq_str = P('u')^-1 * l.delimited_range("'", true)
local dq_str = P('U')^-1 * l.delimited_range('"', true)
local triple_sq_str = "'''" * (l.any - "'''")^0 * P("'''")^-1
local triple_dq_str = '"""' * (l.any - '"""')^0 * P('"""')^-1
-- TODO: raw_strs cannot end in single \.
local raw_sq_str = P('u')^-1 * 'r' * l.delimited_range("'", false, true)
local raw_dq_str = P('U')^-1 * 'R' * l.delimited_range('"', false, true)
local string = token(l.STRING, triple_sq_str + triple_dq_str + sq_str + dq_str +
raw_sq_str + raw_dq_str)
-- Numbers.
local dec = l.digit^1 * S('Ll')^-1
local bin = '0b' * S('01')^1 * ('_' * S('01')^1)^0
local oct = '0' * R('07')^1 * S('Ll')^-1
local integer = S('+-')^-1 * (bin + l.hex_num + oct + dec)
local number = token(l.NUMBER, l.float + integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'async', 'await',
'and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif',
'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import',
'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'print', 'raise',
'return', 'try', 'while', 'with', 'yield',
-- Descriptors/attr access.
'__get__', '__set__', '__delete__', '__slots__',
-- Class.
'__new__', '__init__', '__del__', '__repr__', '__str__', '__cmp__',
'__index__', '__lt__', '__le__', '__gt__', '__ge__', '__eq__', '__ne__',
'__hash__', '__nonzero__', '__getattr__', '__getattribute__', '__setattr__',
'__delattr__', '__call__',
-- Operator.
'__add__', '__sub__', '__mul__', '__div__', '__floordiv__', '__mod__',
'__divmod__', '__pow__', '__and__', '__xor__', '__or__', '__lshift__',
'__rshift__', '__nonzero__', '__neg__', '__pos__', '__abs__', '__invert__',
'__iadd__', '__isub__', '__imul__', '__idiv__', '__ifloordiv__', '__imod__',
'__ipow__', '__iand__', '__ixor__', '__ior__', '__ilshift__', '__irshift__',
-- Conversions.
'__int__', '__long__', '__float__', '__complex__', '__oct__', '__hex__',
'__coerce__',
-- Containers.
'__len__', '__getitem__', '__missing__', '__setitem__', '__delitem__',
'__contains__', '__iter__', '__getslice__', '__setslice__', '__delslice__',
-- Module and class attribs.
'__doc__', '__name__', '__dict__', '__file__', '__path__', '__module__',
'__bases__', '__class__', '__self__',
-- Stdlib/sys.
'__builtin__', '__future__', '__main__', '__import__', '__stdin__',
'__stdout__', '__stderr__',
-- Other.
'__debug__', '__doc__', '__import__', '__name__'
})
-- Functions.
local func = token(l.FUNCTION, word_match{
'abs', 'all', 'any', 'apply', 'basestring', 'bool', 'buffer', 'callable',
'chr', 'classmethod', 'cmp', 'coerce', 'compile', 'complex', 'copyright',
'credits', 'delattr', 'dict', 'dir', 'divmod', 'enumerate', 'eval',
'execfile', 'exit', 'file', 'filter', 'float', 'frozenset', 'getattr',
'globals', 'hasattr', 'hash', 'help', 'hex', 'id', 'input', 'int', 'intern',
'isinstance', 'issubclass', 'iter', 'len', 'license', 'list', 'locals',
'long', 'map', 'max', 'min', 'object', 'oct', 'open', 'ord', 'pow',
'property', 'quit', 'range', 'raw_input', 'reduce', 'reload', 'repr',
'reversed', 'round', 'set', 'setattr', 'slice', 'sorted', 'staticmethod',
'str', 'sum', 'super', 'tuple', 'type', 'unichr', 'unicode', 'vars', 'xrange',
'zip'
})
-- Constants.
local constant = token(l.CONSTANT, word_match{
'ArithmeticError', 'AssertionError', 'AttributeError', 'BaseException',
'DeprecationWarning', 'EOFError', 'Ellipsis', 'EnvironmentError', 'Exception',
'False', 'FloatingPointError', 'FutureWarning', 'GeneratorExit', 'IOError',
'ImportError', 'ImportWarning', 'IndentationError', 'IndexError', 'KeyError',
'KeyboardInterrupt', 'LookupError', 'MemoryError', 'NameError', 'None',
'NotImplemented', 'NotImplementedError', 'OSError', 'OverflowError',
'PendingDeprecationWarning', 'ReferenceError', 'RuntimeError',
'RuntimeWarning', 'StandardError', 'StopIteration', 'SyntaxError',
'SyntaxWarning', 'SystemError', 'SystemExit', 'TabError', 'True', 'TypeError',
'UnboundLocalError', 'UnicodeDecodeError', 'UnicodeEncodeError',
'UnicodeError', 'UnicodeTranslateError', 'UnicodeWarning', 'UserWarning',
'ValueError', 'Warning', 'ZeroDivisionError'
})
-- Self.
local self = token('self', P('self'))
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('!%^&*()[]{}-=+/|:;.,?<>~`'))
-- Decorators.
local decorator = token('decorator', l.starts_line('@') * l.nonnewline^0)
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'function', func},
{'constant', constant},
{'self', self},
{'identifier', identifier},
{'comment', comment},
{'string', string},
{'number', number},
{'decorator', decorator},
{'operator', operator},
}
M._tokenstyles = {
self = l.STYLE_TYPE,
decorator = l.STYLE_PREPROCESSOR
}
M._FOLDBYINDENTATION = true
return M
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