javascript - Slimit python minifier strange behaviour -

i trying minify javascript python 'slimit' package.

import slimit slimit.minify('[1,2,3,4,5,6,7,8]') 

runs fine , returns '[1,2,3,4,5,6,7,8]'

import slimit slimit.minify('[01,02,03,04,05,06,07,08]') 

gives error:

syntaxerror: unexpected token (number, '8') @ 1:23 between lextoken(number,'0',1,22) , lextoken(rbracket,']',1,24)

the strange thing minifying string [01,02,03,04,05,06,07] works ok.

slimit returns error when minifying 8 or more 0 padded integers in array.

this down lexer used slimit. numbers starting "0" (but not "0x") treated octal integers. sequence "08" therefore ends 2 separate tokens ("0", "8") hence "unexpected token" error.

note following:

>>> slimit import lexer >>> l = lexer() >>> l.input("02") >>> l.token()  lextoken(number,'02',1,0) >>> l.input("08") >>> l.token()   lextoken(number,'0',1,0) >>> l.token() lextoken(number,'8',1,1) 

looking the source lexer, see regex used identify numbers:

t_number = r""" (?:     0[xx][0-9a-fa-f]+              # hex_integer_literal  |  0[0-7]+                        # or octal_integer_literal (spec b.1.1)  |  (?:                            # or decimal_literal         (?:0|[1-9][0-9]*)          # decimal_integer_literal         \.                         # dot         [0-9]*                     # decimal_digits_opt         (?:[ee][+-]?[0-9]+)?       # exponent_part_opt      |         \.                         # dot         [0-9]+                     # decimal_digits         (?:[ee][+-]?[0-9]+)?       # exponent_part_opt      |         (?:0|[1-9][0-9]*)          # decimal_integer_literal         (?:[ee][+-]?[0-9]+)?       # exponent_part_opt      ) ) """ 

the question of whether slimit should support octal representations or treat them plain base-10 integers open debate.

the json spec explicitly forbids octal forms of numbers , tools flag invalid json (try jsonlint). rfc 4627 (2.4. numbers):

octal , hex forms not allowed. leading zeros not allowed.