bs = Group(shell + OneOrMore(exponent))
bs_sp = Group(shell_sp + OneOrMore(exponent_sp))
endbs = Word('*').suppress()
basis_set = Group(
Str.setResultsName('bdescr') + Number +
OneOrMore(bs
| bs_sp).setResultsName('basis') + Optional(endbs))
ecp_body = OneOrMore(eol + SkipTo(eol).suppress() +
Group(Number +
OneOrMore(Group(Number + Number + Number))))
ecp = Group(
Str.setResultsName('edescr') + Number.suppress() +
SkipTo(Number).suppress() + Number.setResultsName('lmax') +
Number.setResultsName('core') + ecp_body.setResultsName('ecp'))
# define grammar here
grammar = Optional(OneOrMore(comment)) + Optional(endbs) \
+ Group(OneOrMore(basis_set)) + Optional(OneOrMore(comment)) \
+ Optional(Group(OneOrMore(ecp)))
lstr = {
'S': 0,
'SP': 1,
'P': 2,
'D': 3,
'F': 4,
def bnf(css_style_obj):
"""
* decimal_digit :: '0' .. '9'
* sign :: '-' | '+'
* integer :: decimal_digit+
* float :: [ sign ] integer '.' [ integer ] [ 'e' | 'E' [ sign ] integer ]
* lower_case :: 'a' .. 'z'
* upper_case :: 'A' .. 'Z'
* alpha :: lower_case | upper_case
* punctuation :: '`' | '~' | '!' | '@' | '#' | '$' | '%' | '^' | '&' | '*' | '(' | ')' |
'_' | '=' | '+' | ';' | ':' | '\'' | ',' | '<' | '.' | '>' | '/' | '?' |
' ' | '-'
* string_delim :: '"' | '\''
* string :: string_delim [ alpha | decimal_digit | punctuation ]* string_delim
* identifier :: '_' | alpha [ alpha | decimal_digit | '_' ]*
* attr_selector :: '[' + identifier [ [ '~' | '*' | '^' | '$' | '|' ] '=' string ] ']'
* class_or_id :: ( '#' | '.' ) identifier
* pseudo_class :: ':' alpha [ alpha | '-' ]* [ '(' integer | identifier ')' ]
* selector :: identifier [ class_or_id | attr_selector ] [ pseudo_class ]
[ identifier [ pseudo_class ] ]
* parameter_name :: alpha [ alpha | decimal_digit | '_' | '-' ]*
* lower_hex :: 'a' .. 'f'
* upper_hex :: 'A' .. 'F'
* hex_digit :: decimal_digit | lower_hex | upper_hex
* color :: '#' hex_digit * 6
* comment :: '/' '*' .*? '*' '/'
* url :: 'url' '(' string ')'
* pixel_count :: integer 'px'
* percentage :: integer '%'
* parameter_val :: url | color | pixel_count | percentage | parameter_name | float | integer
* parameter :: parameter_name ':' [ comment* ]* parameter_val
[ parameter_val | comment* ]+ ';'
* parameter_block :: selector [ ',' selector ]* '{' ( parameter | comment* )+ '}'
"""
global BNF
if BNF is None:
fnumber = Regex(r"[+-]?\d+(:?\.\d*)?(:?[eE][+-]?\d+)?")
identifier = Word("_"+alphas+nums)
tilde = Literal("~")
asterisk = Literal("*")
caret = Literal("^")
dsign = Literal("$")
pipe = Literal("|")
equal = Literal("=")
squote = Literal("'")
sqstring = squote + Regex(r"[^']+") + squote
dquote = Literal('"')
dqstring = dquote + Regex(r"[^\"]+") + dquote
string = sqstring | dqstring
class_or_id = Word("#"+".", "_"+alphas+nums)
pclass = Combine(Word(":", "-"+alphas) + Optional(
'(' + (Word(nums) | identifier) + ')'))
attr_selector = Combine("[" + identifier + Optional(Optional(
tilde | asterisk | caret | dsign | pipe) + equal + string) + "]")
selector = Combine(Word("_"+alphas, "_"+alphas+nums) + Optional(
attr_selector | class_or_id) + Optional(pclass)) | Combine(
class_or_id + Optional(pclass)) | attr_selector
integer = Word(nums)
parameter_name = Word(alphas, alphas + nums + "_-")
param_str = Word(alphas, alphas + nums + "_-")
comment = Regex(r"[/][*].*?[*][/]", flags=re.S)
lbrack = Literal("{")
rbrack = Literal("}")
px_suffix = Literal("px")
pix_count = Combine(Word(nums) + px_suffix)
percent = Literal("%")
percentage = Combine(Word(nums) + percent)
color = Word("#", hexnums, exact=7)
urlstr = Keyword("url")
url = urlstr + '(' + string + ')'
parameter_val = url | color | pix_count | percentage | param_str | fnumber | integer
parameter = (parameter_name.setParseAction(
css_style_obj.push_param_name) + ':' + ZeroOrMore(comment.suppress()) + OneOrMore(
parameter_val.setParseAction(css_style_obj.push_value) + ZeroOrMore(
comment.suppress())) + ';').setParseAction(css_style_obj.push_parameter)
parameter_block = (delimitedList(selector).setParseAction(
css_style_obj.push_ident_list) + lbrack + OneOrMore(
comment.suppress() | parameter) + rbrack).setParseAction(
css_style_obj.push_param_block)
BNF = OneOrMore(comment.suppress() | parameter_block)
return BNF
