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|
# Character classes
### NOTE: These definitions are implemented in Python as an optimization,
### because lots of | has the most parsley overhead. The Python
### implementations are intended to match the behavior of the rules below.
#_space = ' ' | '\r' | '\n' | '\f' | '\t'
#ws = < _space+ >
#ows = < _space* >
#hex = DIGIT | 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'A' | 'B' | 'C' | 'D' | 'E' | 'F'
#letterish = letter | '_' | '-'
escape = '\\' (
'\n' -> ''
# TODO this is supposed to replace junk with FFFD
| <hex{1,6}>:cp ws? -> unichr(int(cp, 16))
# TODO i think this should be... more specific? ascii + valid unicode?
# see also: rx.rb
| anything
)
### Tokens
identifier = < letterish (letterish | digit)* >
number = < digit+ ('.' digit*)? | '.' digit+ >
variable = < '$' identifier >
### Components
expression = comma_list
comma_list = spaced_list:head (
ows ',' ows
spaced_list:tail -> tail
)*:tails -> ListLiteral([head] + tails) if tails else head
spaced_list = single_expression:head (
ows
single_expression:tail -> tail
)*:tails -> ListLiteral([head] + tails, comma=False) if tails else head
single_expression = or_test ^(single expression)
or_test = and_test:head (
'o' 'r'
and_test:tail -> tail
)*:tails -> AnyOp(*[head] + tails) if tails else head
and_test = not_test:head (
'a' 'n' 'd'
not_test:tail -> tail
)*:tails -> AllOp(*[head] + tails) if tails else head
not_test = comparison | ( 'n' 'o' 't' not_test:node -> NotOp(node) )
comparison = add_expr:node (
ows (
'<' '=' !(operator.le):op
| '>' '=' !(operator.ge):op
| '<' !(operator.lt):op
| '>' !(operator.gt):op
| '=' '=' !(operator.eq):op
| '!' '=' !(operator.ne):op
) ows
add_expr:operand
!(BinaryOp(op, node, operand)):node
)* -> node
add_expr = mult_expr:node (
ows (
'+' !(operator.add):op
| '-' !(operator.sub):op
) ows
mult_expr:operand
!(BinaryOp(op, node, operand)):node
)* -> node
mult_expr = unary_expr:node (
ows (
'*' !(operator.mul):op
| '/' !(operator.truediv):op
) ows
unary_expr:operand
!(BinaryOp(op, node, operand)):node
)* -> node
unary_expr = (
'-' unary_expr:node -> UnaryOp(operator.neg, node)
| '+' unary_expr:node -> UnaryOp(operator.pos, node)
| atom
)
atom = (
# Parenthesized expression
'(' comma_list:node ')' -> Parentheses(node)
# Old xCSS-style parenthesized expression
# TODO kill this off
| '[' comma_list:node ']' -> Parentheses(node)
# Map literal
| map
# URL literal
| 'u' 'r' 'l' '(' inside_url:s ')' -> FunctionLiteral('url', s)
# Function call
| identifier:name '(' argspec:args ')' -> CallOp(name, args)
# Bareword
| < '!'? identifier >:word -> Literal(parse_bareword(word))
# Number
| number:number < '%' | letter+ >?:unit -> Literal(Number(float(number), unit=unit))
# String
| string
# Color literal
# DEVIATION: Sass doesn't support alpha in hex literals
| '#' (
<hex{2}>:red <hex{2}>:green <hex{2}>:blue
<hex{2}>?:alpha
-> Literal(Color.from_rgb(
int(red, 16) / 255.,
int(green, 16) / 255.,
int(blue, 16) / 255.,
int(alpha or "ff", 16) / 255.,
original_literal="#" + red + green + blue + (alpha or '')))
| hex:red hex:green hex:blue hex?:alpha
-> Literal(Color.from_rgb(
int(red, 16) / 15.,
int(green, 16) / 15.,
int(blue, 16) / 15.,
int(alpha or "f", 16) / 15.,
original_literal="#" + red + green + blue + (alpha or '')))
)
# Variable
| variable:name -> Variable(name)
)
^(single value)
### Map literals
map = '(' ows
( map_pair:pair ows ',' ows -> pair )*:pairs
( map_pair:pair ows !(pairs.append(pair)) )?
')'
-> MapLiteral(pairs)
map_pair =
single_expression:key
ows ':' ows
spaced_list:value
-> (key, value)
### Strings, literals, and interpolation
# TODO I'm not entirely sure any of these character classes are correct
# TODO ruby sass appears to preserve escapes
inside_url = (
interpolation:node -> node
| variable:name -> Variable(name)
| (
escape
| '#' ~'{'
| anything:ch ?(ord(ch) > 32 and ch not in ' !"#$\'()') -> ch
)+:s -> Literal(String(''.join(s), quotes=None))
| string_part(')'):s -> Literal(String(s, quotes=None))
)*:nodes
-> Interpolation(nodes, quotes=None)
string = (
'"' string_contents('"' '"'):node '"' -> node
| '\'' string_contents('\'' '\''):node '\'' -> node
)
interpolation = '#' '{' expression:node '}' -> node
string_contents :end :quotes =
(
interpolation:node -> node
| string_part(end):s -> Literal(String(s, quotes=quotes))
)*:nodes
-> Interpolation(nodes, quotes=quotes)
string_part :end = <(
'#' ~'{'
| anything:ch ?(ch not in ('#', end))
)+>
### Function definitions and arguments
goal_argspec = argspec
argspec = (
argspec_item:node
ows ',' ows
-> node
)*:nodes
( argspec_item:tail ows !(nodes.append(tail)) )?
-> ArgspecLiteral(nodes)
argspec_item =
ows
(
( variable:name ows ':' ows -> Variable(name) )?:name
spaced_list:value
-> (name, value)
)
|
