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parser.y
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parser.y
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class CSSPool::CSS::Parser
token CHARSET_SYM IMPORT_SYM STRING SEMI IDENT S COMMA LBRACE RBRACE STAR HASH
token LSQUARE RSQUARE EQUAL INCLUDES DASHMATCH RPAREN FUNCTION GREATER PLUS
token SLASH NUMBER MINUS LENGTH PERCENTAGE EMS EXS ANGLE TIME FREQ URI
token IMPORTANT_SYM MEDIA_SYM
rule
document
: { @handler.start_document }
stylesheet
{ @handler.end_document }
;
stylesheet
: charset stylesheet
| import stylesheet
| charset
| import
| body
;
charset
: CHARSET_SYM STRING SEMI { @handler.charset interpret_string(val[1]), {} }
;
import
: IMPORT_SYM import_location medium SEMI {
@handler.import_style [val[2]].flatten, val[1]
}
| IMPORT_SYM import_location SEMI {
@handler.import_style [], val[1]
}
;
import_location
: import_location S
| STRING { result = Terms::String.new interpret_string val.first }
| URI { result = Terms::URI.new interpret_uri val.first }
;
medium
: medium COMMA IDENT {
result = [val.first, Terms::Ident.new(interpret_identifier val.last)]
}
| IDENT {
result = Terms::Ident.new interpret_identifier val.first
}
;
body
: ruleset body
| media body
| ruleset
| media
;
media
: start_media body RBRACE { @handler.end_media val.first }
;
start_media
: MEDIA_SYM medium LBRACE {
result = [val[1]].flatten
@handler.start_media result
}
| MEDIA_SYM LBRACE { result = [] }
;
ruleset
: start_selector declarations RBRACE {
@handler.end_selector val.first
}
| start_selector RBRACE {
@handler.end_selector val.first
}
;
start_selector
: S start_selector { result = val.last }
| selectors LBRACE {
@handler.start_selector val.first
}
;
selectors
: selector COMMA selectors
{
# FIXME: should always garantee array
sel = Selector.new(val.first, {})
result = [sel, val[2]].flatten
}
| selector
{
result = [Selector.new(val.first, {})]
}
;
selector
: simple_selector combinator selector
{
val = val.flatten
val[2].combinator = val.delete_at 1
result = val
}
| simple_selector
;
combinator
: S { result = :s }
| GREATER { result = :> }
| PLUS { result = :+ }
;
simple_selector
: element_name hcap {
selector = val.first
selector.additional_selectors = val.last
result = [selector]
}
| element_name { result = val }
| hcap
{
ss = Selectors::Simple.new nil, nil
ss.additional_selectors = val.flatten
result = [ss]
}
;
element_name
: IDENT { result = Selectors::Type.new interpret_identifier val.first }
| STAR { result = Selectors::Universal.new val.first }
;
hcap
: hash { result = val }
| class { result = val }
| attrib { result = val }
| pseudo { result = val }
| hash hcap { result = val.flatten }
| class hcap { result = val.flatten }
| attrib hcap { result = val.flatten }
| pseudo hcap { result = val.flatten }
;
hash
: HASH {
result = Selectors::Id.new interpret_identifier val.first.sub(/^#/, '')
}
class
: '.' IDENT {
result = Selectors::Class.new interpret_identifier val.last
}
;
attrib
: LSQUARE IDENT EQUAL IDENT RSQUARE {
result = Selectors::Attribute.new(
interpret_identifier(val[1]),
interpret_identifier(val[3]),
Selectors::Attribute::EQUALS
)
}
| LSQUARE IDENT EQUAL STRING RSQUARE {
result = Selectors::Attribute.new(
interpret_identifier(val[1]),
interpret_string(val[3]),
Selectors::Attribute::EQUALS
)
}
| LSQUARE IDENT INCLUDES STRING RSQUARE {
result = Selectors::Attribute.new(
interpret_identifier(val[1]),
interpret_string(val[3]),
Selectors::Attribute::INCLUDES
)
}
| LSQUARE IDENT INCLUDES IDENT RSQUARE {
result = Selectors::Attribute.new(
interpret_identifier(val[1]),
interpret_identifier(val[3]),
Selectors::Attribute::INCLUDES
)
}
| LSQUARE IDENT DASHMATCH IDENT RSQUARE {
result = Selectors::Attribute.new(
interpret_identifier(val[1]),
interpret_identifier(val[3]),
Selectors::Attribute::DASHMATCH
)
}
| LSQUARE IDENT DASHMATCH STRING RSQUARE {
result = Selectors::Attribute.new(
interpret_identifier(val[1]),
interpret_string(val[3]),
Selectors::Attribute::DASHMATCH
)
}
| LSQUARE IDENT RSQUARE {
result = Selectors::Attribute.new(
interpret_identifier(val[1]),
nil,
Selectors::Attribute::SET
)
}
;
pseudo
: ':' IDENT {
result = Selectors::PseudoClass.new(
interpret_identifier(val[1])
)
}
| ':' FUNCTION RPAREN {
result = Selectors::PseudoClass.new(
interpret_identifier(val[1].sub(/\($/, '')),
''
)
}
| ':' FUNCTION IDENT RPAREN {
result = Selectors::PseudoClass.new(
interpret_identifier(val[1].sub(/\($/, '')),
interpret_identifier(val[2])
)
}
;
declarations
: declaration SEMI declarations
| declaration SEMI
| declaration
;
declaration
: property ':' expr prio
{ @handler.property val.first, val[2], val[3] }
| property ':' S expr prio
{ @handler.property val.first, val[3], val[4] }
| property S ':' expr prio
{ @handler.property val.first, val[3], val[4] }
| property S ':' S expr prio
{ @handler.property val.first, val[4], val[5] }
;
prio
: IMPORTANT_SYM { result = true }
| { result = false }
;
property
: IDENT { result = interpret_identifier val[0] }
;
operator
: COMMA
| SLASH
| EQUAL
;
expr
: term operator expr {
result = [val.first, val.last].flatten
val.last.first.operator = val[1]
}
| term expr { result = val.flatten }
| term { result = val }
;
term
: ident
| numeric
| string
| uri
| hexcolor
| function
;
function
: function S { result = val.first }
| FUNCTION expr RPAREN {
name = interpret_identifier val.first.sub(/\($/, '')
if name == 'rgb'
result = Terms::Rgb.new(*val[1])
else
result = Terms::Function.new name, val[1]
end
}
;
hexcolor
: hexcolor S { result = val.first }
| HASH { result = Terms::Hash.new val.first.sub(/^#/, '') }
;
uri
: uri S { result = val.first }
| URI { result = Terms::URI.new interpret_uri val.first }
string
: string S { result = val.first }
| STRING { result = Terms::String.new interpret_string val.first }
;
numeric
: unary_operator numeric {
result = val[1]
val[1].unary_operator = val.first
}
| NUMBER {
result = Terms::Number.new numeric val.first
}
| PERCENTAGE {
result = Terms::Number.new numeric(val.first), nil, '%'
}
| LENGTH {
unit = val.first.gsub(/[\s\d.]/, '')
result = Terms::Number.new numeric(val.first), nil, unit
}
| EMS {
result = Terms::Number.new numeric(val.first), nil, 'em'
}
| EXS {
result = Terms::Number.new numeric(val.first), nil, 'ex'
}
| ANGLE {
unit = val.first.gsub(/[\s\d.]/, '')
result = Terms::Number.new numeric(val.first), nil, unit
}
| TIME {
unit = val.first.gsub(/[\s\d.]/, '')
result = Terms::Number.new numeric(val.first), nil, unit
}
| FREQ {
unit = val.first.gsub(/[\s\d.]/, '')
result = Terms::Number.new numeric(val.first), nil, unit
}
;
unary_operator
: MINUS { result = :minus }
| PLUS { result = :plus }
;
ident
: ident S { result = val.first }
| IDENT { result = Terms::Ident.new interpret_identifier val.first }
;
---- inner
def numeric thing
thing = thing.gsub(/[^\d.]/, '')
Integer(thing) rescue Float(thing)
end
def interpret_identifier s
interpret_escapes s
end
def interpret_uri s
interpret_escapes s.match(/^url\((.*)\)$/mu)[1].strip.match(/^(['"]?)((?:\\.|.)*)\1$/mu)[2]
end
def interpret_string s
interpret_escapes s.match(/^(['"])((?:\\.|.)*)\1$/mu)[2]
end
def interpret_escapes s
token_exp = /\\([0-9a-fA-F]{1,6}(?:\r\n|\s)?)|\\(.)|(.)/mu
characters = s.scan(token_exp).map do |u_escape, i_escape, ident|
if u_escape
code = u_escape.chomp.to_i 16
code = 0xFFFD if code > 0x10FFFF
[code].pack('U')
elsif i_escape
if i_escape == "\n"
''
else
i_escape
end
else
ident
end
end.join ''
end