java.lang.Object
- dev.amp.validator.utils.SelectorUtils

```
public final class SelectorUtils
extends Object
```
Methods to handle selector validation.

Author:

nhant01, GeorgeLuo

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static Combinator.CombinatorType`	`combinatorTypeForToken(com.steadystate.css.parser.Token token)`	The CombinatorType for a given token; helper function used when constructing a Combinator instance.
`static List<com.steadystate.css.parser.Token>`	`extractAFunction(TokenStream tokenStream, List<ErrorToken> errors)`	Returns a function's contents in tokenList, including the leading FunctionToken, but excluding the trailing CloseParen token and appended with an EOFToken instead.
`static boolean`	`isDelim(com.steadystate.css.parser.Token token, String delimChar)`	Helper function for determining whether the provided token is a specific delimiter.
`static boolean`	`isSimpleSelectorSequenceStart(com.steadystate.css.parser.Token token)`	Whether or not the provided token could be the start of a simple selector sequence.
`static AttrSelector`	`parseAnAttrSelector(TokenStream tokenStream)`	tokenStream.current() must be the open square token.
`static Selector`	`parseASelector(TokenStream tokenStream)`	The selector production from http://www.w3.org/TR/css3-selectors/#grammar Returns an ErrorToken if no selector is found.
`static SimpleSelectorSequence`	`parseASimpleSelectorSequence(TokenStream tokenStream)`	tokenStream.current must be the first token of the sequence.
`static TypeSelector`	`parseATypeSelector(TokenStream tokenStream)`	tokenStream.current() is the first token of the type selector.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isSimpleSelectorSequenceStart
```
public static boolean isSimpleSelectorSequenceStart(@Nonnull
                                                    com.steadystate.css.parser.Token token)
```
Whether or not the provided token could be the start of a simple selector sequence. See the simple_selector_sequence production in http://www.w3.org/TR/css3-selectors/#grammar.

Parameters:

token - to analyze

Returns:

is SimpleSelector Sequence Start

isDelim

public static boolean isDelim(@Nonnull
                              com.steadystate.css.parser.Token token,
                              @Nonnull
                              String delimChar)

Helper function for determining whether the provided token is a specific delimiter.

Parameters:: token - to analyze; delimChar - to check
Returns:: if this is a delim char

parseASimpleSelectorSequence

public static SimpleSelectorSequence parseASimpleSelectorSequence(@Nonnull
                                                                  TokenStream tokenStream)
                                                           throws SelectorException,
                                                                  CssValidationException

tokenStream.current must be the first token of the sequence. This function will return an error if no selector is found.

Parameters:: tokenStream - token stream
Returns:: the SimpleSelectorSequence instance
Throws:: CssValidationException - the CssValidationException; SelectorException - the SelectorException

parseASelector

public static Selector parseASelector(@Nonnull
                                      TokenStream tokenStream)
                               throws CssValidationException,
                                      SelectorException

The selector production from http://www.w3.org/TR/css3-selectors/#grammar Returns an ErrorToken if no selector is found.

Parameters:: tokenStream - token stream
Returns:: the selector
Throws:: CssValidationException - the CssValidationException; SelectorException - the SelectorException

combinatorTypeForToken

public static Combinator.CombinatorType combinatorTypeForToken(@Nonnull
                                                               com.steadystate.css.parser.Token token)
                                                        throws CssValidationException

The CombinatorType for a given token; helper function used when constructing a Combinator instance.

Parameters:: token - the token
Returns:: the combinator type
Throws:: CssValidationException - the CssValidationException

parseATypeSelector

public static TypeSelector parseATypeSelector(@Nonnull
                                              TokenStream tokenStream)

tokenStream.current() is the first token of the type selector.

Parameters:: tokenStream - token stream
Returns:: the type selector

parseAnAttrSelector

public static AttrSelector parseAnAttrSelector(@Nonnull
                                               TokenStream tokenStream)
                                        throws SelectorException,
                                               CssValidationException

tokenStream.current() must be the open square token.

Parameters:: tokenStream - token stream
Returns:: attribute selector
Throws:: CssValidationException - the CssValidationException; SelectorException - the SelectorException

extractAFunction

public static List<com.steadystate.css.parser.Token> extractAFunction(@Nonnull
                                                                      TokenStream tokenStream,
                                                                      @Nonnull
                                                                      List<ErrorToken> errors)
                                                               throws CssValidationException

Returns a function's contents in tokenList, including the leading FunctionToken, but excluding the trailing CloseParen token and appended with an EOFToken instead.

Parameters:: tokenStream - token stream; errors - array of error tokens
Returns:: the list of token
Throws:: CssValidationException - the CssValidationException

Class SelectorUtils