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Zotonic standard library

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zotonic_stdlib src z_css_parser.yrl
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src/z_css_parser.yrl 

%% @author Marc Worrell <marc@worrell.nl>

%% @copyright 2014 Marc Worrell

%%

%% @doc Grammar for strict CSS parser. Based on http://www.w3.org/TR/CSS21/grammar.html



%% Copyright 2014 Marc Worrell

%%

%% Licensed under the Apache License, Version 2.0 (the "License");

%% you may not use this file except in compliance with the License.

%% You may obtain a copy of the License at

%% 

%%     http://www.apache.org/licenses/LICENSE-2.0

%% 

%% Unless required by applicable law or agreed to in writing, software

%% distributed under the License is distributed on an "AS IS" BASIS,

%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

%% See the License for the specific language governing permissions and

%% limitations under the License.



Nonterminals



    Stylesheet

    Charset

    Import

    Location

    MediaList

    Rules

    RuleSetList

    RuleSet

    Media

    Page

    DeclarationList

    Declaration

    Prio

    Expr

    Function

    SelectorList

    Selector

    SimpleSelector

    Term

    Class

    Attrib

    AttrOptVal

    AttrVal

    Pseudo

    PseudoPage

    PseudoVal

    .



Terminals



    % badcomment

    includes

    dashmatch

    string

    % bad_string

    ident

    hash

    import_sym

    page_sym

    media_sym

    charset_sym

    important_sym

    ems

    exs

    length

    angle

    time

    freq

    dimension

    percentage

    number

    uri

    % bad_uri

    function

    ';'

    '{'

    '}'

    '['

    ']'

    ')'

    ','

    '.'

    ':'

    '*'

    '/'

    '='

    '>'

    '-'

    '+'

    .



Rootsymbol

    Stylesheet.



%% Expected shift/reduce conflicts

Expect 0.



Stylesheet -> Charset Import Rules      : {stylesheet, '$1', '$2', '$3'}.



Charset -> '$empty'                     : no_charset.

Charset -> charset_sym string ';'       : {charset, '$2'}.



Import -> '$empty'                           : no_import.

Import -> import_sym Location MediaList ';'  : {import, '$2', '$3'}.



Location -> string                        : '$1'.

Location -> uri                           : '$1'.



Media -> media_sym MediaList '{' RuleSetList '}' : {media, '$2', '$4'}.



MediaList -> ident                       : ['$1'].

MediaList -> ident ',' MediaList         : ['$1'] ++ '$3'.



Rules -> '$empty'                         : [].

Rules -> RuleSet Rules                    : ['$1' | '$2'].

Rules -> Media Rules                      : ['$1' | '$2'].

Rules -> Page Rules                       : ['$1' | '$2'].



RuleSetList -> '$empty'                   : [].

RuleSetList -> RuleSet RuleSetList        : ['$1' | '$2'].



RuleSet -> SelectorList '{' DeclarationList '}' : {rule, '$1', '$3'}.



SelectorList -> Selector                    : ['$1'].

SelectorList -> SelectorList ',' Selector   : '$1' ++ ['$3'].



DeclarationList -> Declaration                      : '$1'.

DeclarationList -> DeclarationList ';' Declaration  : '$1' ++ '$3'.



Declaration -> '$empty'                     : [].

Declaration -> ident ':' Expr Prio          : [ {declaration, '$1', '$3', '$4'} ].



Prio -> '$empty'                            : normal.

Prio -> important_sym                       : important.



Expr -> Term                                : '$1'.

Expr -> Expr '/' Term                       : {operator, '/', '$1', '$3'}.

Expr -> Expr ',' Term                       : {operator, ',', '$1', '$3'}.



Term -> '-' Term                            : {operator, '-', '$2'}.

Term -> '+' Term                            : {operator, '+', '$2'}.

Term -> number                              : '$1'.

Term -> percentage                          : '$1'.

Term -> length                              : '$1'.

Term -> ems                                 : '$1'.

Term -> exs                                 : '$1'.

Term -> angle                               : '$1'.

Term -> time                                : '$1'.

Term -> freq                                : '$1'.

Term -> dimension                           : '$1'.

Term -> string                              : '$1'.

Term -> ident                               : '$1'.

Term -> uri                                 : '$1'.

Term -> hash                                : '$1'.

Term -> Function                            : '$1'.



Function -> function Expr ')'               : {function, '$1', '$2'}.



Selector -> SimpleSelector                  : [{none, '$1'}].

Selector -> Selector SimpleSelector         : '$1' ++ [{none, '$2'}].

Selector -> Selector '+' SimpleSelector     : '$1' ++ [{'+', '$3'}].

Selector -> Selector '>' SimpleSelector     : '$1' ++ [{'>', '$3'}].



SimpleSelector -> '*'                   : '*'.

SimpleSelector -> ident                 : '$1'.

SimpleSelector -> hash                  : '$1'.

SimpleSelector -> Class                 : '$1'.

SimpleSelector -> Attrib                : '$1'.

SimpleSelector -> Pseudo                : '$1'.



Class -> '.' ident                      : {class, '$2'}.



Attrib -> '[' ident AttrOptVal ']'      : {attrib, '$2', '$3'}.



AttrOptVal -> '$empty'                  : undefined.

AttrOptVal -> '=' AttrVal               : {'=', '$2'}.

AttrOptVal -> includes AttrVal          : {includes, '$2'}.

AttrOptVal -> dashmatch AttrVal         : {dashmatch, '$2'}.



AttrVal -> ident                        : '$1'.

AttrVal -> string                       : '$1'.



Pseudo -> ':' PseudoVal                 : {pseudo, '$2'}.



PseudoVal -> ident                      : '$1'.

PseudoVal -> function ident ')'         : {function, '$1', '$2'}.



Page -> page_sym PseudoPage '{' DeclarationList '}' : {page, '$2', '$4'}.



PseudoPage -> '$empty'                  : undefined.

PseudoPage -> ':' ident                 : '$1'.