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# cython: language_level=3, py2_import=True
#
# Cython Scanner - Lexical Definitions
#
from __future__ import absolute_import, unicode_literals
raw_prefixes = "rR"
bytes_prefixes = "bB"
string_prefixes = "fFuU" + bytes_prefixes
char_prefixes = "cC"
any_string_prefix = raw_prefixes + string_prefixes + char_prefixes
IDENT = 'IDENT'
def make_lexicon():
from ..Plex import \
Str, Any, AnyBut, AnyChar, Rep, Rep1, Opt, Bol, Eol, Eof, \
TEXT, IGNORE, State, Lexicon
from .Scanning import Method
letter = Any("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_")
digit = Any("0123456789")
bindigit = Any("01")
octdigit = Any("01234567")
hexdigit = Any("0123456789ABCDEFabcdef")
indentation = Bol + Rep(Any(" \t"))
def underscore_digits(d):
return Rep1(d) + Rep(Str("_") + Rep1(d))
decimal = underscore_digits(digit)
dot = Str(".")
exponent = Any("Ee") + Opt(Any("+-")) + decimal
decimal_fract = (decimal + dot + Opt(decimal)) | (dot + decimal)
name = letter + Rep(letter | digit)
intconst = decimal | (Str("0") + ((Any("Xx") + underscore_digits(hexdigit)) |
(Any("Oo") + underscore_digits(octdigit)) |
(Any("Bb") + underscore_digits(bindigit)) ))
intsuffix = (Opt(Any("Uu")) + Opt(Any("Ll")) + Opt(Any("Ll"))) | (Opt(Any("Ll")) + Opt(Any("Ll")) + Opt(Any("Uu")))
intliteral = intconst + intsuffix
fltconst = (decimal_fract + Opt(exponent)) | (decimal + exponent)
imagconst = (intconst | fltconst) + Any("jJ")
# invalid combinations of prefixes are caught in p_string_literal
beginstring = Opt(Rep(Any(string_prefixes + raw_prefixes)) |
Any(char_prefixes)
) + (Str("'") | Str('"') | Str("'''") | Str('"""'))
two_oct = octdigit + octdigit
three_oct = octdigit + octdigit + octdigit
two_hex = hexdigit + hexdigit
four_hex = two_hex + two_hex
escapeseq = Str("\\") + (two_oct | three_oct |
Str('N{') + Rep(AnyBut('}')) + Str('}') |
Str('u') + four_hex | Str('x') + two_hex |
Str('U') + four_hex + four_hex | AnyChar)
bra = Any("([{")
ket = Any(")]}")
punct = Any(":,;+-*/|&<>=.%`~^?!@")
diphthong = Str("==", "<>", "!=", "<=", ">=", "<<", ">>", "**", "//",
"+=", "-=", "*=", "/=", "%=", "|=", "^=", "&=",
"<<=", ">>=", "**=", "//=", "->", "@=")
spaces = Rep1(Any(" \t\f"))
escaped_newline = Str("\\\n")
lineterm = Eol + Opt(Str("\n"))
comment = Str("#") + Rep(AnyBut("\n"))
return Lexicon([
(name, IDENT),
(intliteral, Method('strip_underscores', symbol='INT')),
(fltconst, Method('strip_underscores', symbol='FLOAT')),
(imagconst, Method('strip_underscores', symbol='IMAG')),
(punct | diphthong, TEXT),
(bra, Method('open_bracket_action')),
(ket, Method('close_bracket_action')),
(lineterm, Method('newline_action')),
(beginstring, Method('begin_string_action')),
(comment, IGNORE),
(spaces, IGNORE),
(escaped_newline, IGNORE),
State('INDENT', [
(comment + lineterm, Method('commentline')),
(Opt(spaces) + Opt(comment) + lineterm, IGNORE),
(indentation, Method('indentation_action')),
(Eof, Method('eof_action'))
]),
State('SQ_STRING', [
(escapeseq, 'ESCAPE'),
(Rep1(AnyBut("'\"\n\\")), 'CHARS'),
(Str('"'), 'CHARS'),
(Str("\n"), Method('unclosed_string_action')),
(Str("'"), Method('end_string_action')),
(Eof, 'EOF')
]),
State('DQ_STRING', [
(escapeseq, 'ESCAPE'),
(Rep1(AnyBut('"\n\\')), 'CHARS'),
(Str("'"), 'CHARS'),
(Str("\n"), Method('unclosed_string_action')),
(Str('"'), Method('end_string_action')),
(Eof, 'EOF')
]),
State('TSQ_STRING', [
(escapeseq, 'ESCAPE'),
(Rep1(AnyBut("'\"\n\\")), 'CHARS'),
(Any("'\""), 'CHARS'),
(Str("\n"), 'NEWLINE'),
(Str("'''"), Method('end_string_action')),
(Eof, 'EOF')
]),
State('TDQ_STRING', [
(escapeseq, 'ESCAPE'),
(Rep1(AnyBut('"\'\n\\')), 'CHARS'),
(Any("'\""), 'CHARS'),
(Str("\n"), 'NEWLINE'),
(Str('"""'), Method('end_string_action')),
(Eof, 'EOF')
]),
(Eof, Method('eof_action'))
],
# FIXME: Plex 1.9 needs different args here from Plex 1.1.4
#debug_flags = scanner_debug_flags,
#debug_file = scanner_dump_file
)
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