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Added "@supports rule" #46

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Merged
merged 1 commit into from
Nov 10, 2017
Merged

Added "@supports rule" #46

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138 changes: 138 additions & 0 deletions csslint/csslint.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1381,6 +1381,10 @@ Parser.prototype = function(){
this._viewport();
this._skipCruft();
break;
case Tokens.SUPPORTS_SYM:
this._supports();
this._skipCruft();
break;
case Tokens.UNKNOWN_SYM: //unknown @ rule
tokenStream.get();
if (!this.options.strict){
Expand Down Expand Up @@ -1584,6 +1588,137 @@ Parser.prototype = function(){
}

},

_supports: function(emit) {
/*
* supports_rule
* : SUPPORTS_SYM S* supports_condition S* group_rule_body
* ;
*/
var tokenStream = this._tokenStream,
line,
col;

if (tokenStream.match(Tokens.SUPPORTS_SYM)) {
line = tokenStream.token().startLine;
col = tokenStream.token().startCol;

this._readWhitespace();
this._supports_condition();
this._readWhitespace();

tokenStream.mustMatch(Tokens.LBRACE);
this._readWhitespace();

if (emit !== false) {
this.fire({
type: "startsupports",
line: line,
col: col
});
}

while (true) {
if (!this._ruleset()) {
break;
}
}

tokenStream.mustMatch(Tokens.RBRACE);
this._readWhitespace();

this.fire({
type: "endsupports",
line: line,
col: col
});
}
},

_supports_condition: function() {
/*
* supports_condition
* : supports_negation | supports_conjunction | supports_disjunction |
* supports_condition_in_parens
* ;
*/
var tokenStream = this._tokenStream,
ident;

if (tokenStream.match(Tokens.IDENT)) {
ident = tokenStream.token().value.toLowerCase();

if (ident === "not") {
tokenStream.mustMatch(Tokens.S);
this._supports_condition_in_parens();
} else {
tokenStream.unget();
}
} else {
this._supports_condition_in_parens();
this._readWhitespace();

while (tokenStream.peek() === Tokens.IDENT) {
ident = tokenStream.LT(1).value.toLowerCase();
if (ident === "and" || ident === "or") {
tokenStream.mustMatch(Tokens.IDENT);
this._readWhitespace();
this._supports_condition_in_parens();
this._readWhitespace();
}
}
}
},

_supports_condition_in_parens: function() {
/*
* supports_condition_in_parens
* : ( '(' S* supports_condition S* ')' ) | supports_declaration_condition |
* general_enclosed
* ;
*/
var tokenStream = this._tokenStream,
ident;

if (tokenStream.match(Tokens.LPAREN)) {
this._readWhitespace();
if (tokenStream.match(Tokens.IDENT)) {
// look ahead for not keyword, if not given, continue with declaration condition.
ident = tokenStream.token().value.toLowerCase();
if (ident === "not") {
this._readWhitespace();
this._supports_condition();
this._readWhitespace();
tokenStream.mustMatch(Tokens.RPAREN);
} else {
tokenStream.unget();
this._supports_declaration_condition(false);
}
} else {
this._supports_condition();
this._readWhitespace();
tokenStream.mustMatch(Tokens.RPAREN);
}
} else {
this._supports_declaration_condition();
}
},

_supports_declaration_condition: function(requireStartParen) {
/*
* supports_declaration_condition
* : '(' S* declaration ')'
* ;
*/
var tokenStream = this._tokenStream;

if (requireStartParen !== false) {
tokenStream.mustMatch(Tokens.LPAREN);
}
this._readWhitespace();
this._declaration();
tokenStream.mustMatch(Tokens.RPAREN);
},

_media: function(){
/*
Expand Down Expand Up @@ -1622,6 +1757,8 @@ Parser.prototype = function(){
this._font_face();
} else if (tokenStream.peek() == Tokens.VIEWPORT_SYM){
this._viewport();
} else if (tokenStream.peek() == Tokens.SUPPORTS_SYM){
this._supports();
} else if (!this._ruleset()){
break;
}
Expand Down Expand Up @@ -5718,6 +5855,7 @@ var Tokens = [
{ name: "CHARSET_SYM", text: "@charset"},
{ name: "NAMESPACE_SYM", text: "@namespace"},
{ name: "VIEWPORT_SYM", text: ["@viewport", "@-ms-viewport"]},
{ name: "SUPPORTS_SYM", text: "@supports"},
{ name: "UNKNOWN_SYM" },
//{ name: "ATKEYWORD"},

Expand Down