cssgrammar.y

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

        CSSParser* p = static_cast<CSSParser*>(parser);
        Document* doc = p->document();
        if (doc && doc->isHTMLDocument())
            str.lower();
        $$ = str;
    }
    ;

attrib:
    '[' maybe_space attr_name ']' {
        $$ = static_cast<CSSParser*>(parser)->createFloatingSelector();
        $$->setAttribute(QualifiedName(nullAtom, $3, nullAtom));
        $$->m_match = CSSSelector::Set;
    }
    | '[' maybe_space attr_name match maybe_space ident_or_string maybe_space ']' {
        $$ = static_cast<CSSParser*>(parser)->createFloatingSelector();
        $$->setAttribute(QualifiedName(nullAtom, $3, nullAtom));
        $$->m_match = (CSSSelector::Match)$4;
        $$->m_value = $6;
    }
    | '[' maybe_space namespace_selector attr_name ']' {
        AtomicString namespacePrefix = $3;
        CSSParser* p = static_cast<CSSParser*>(parser);
        $$ = p->createFloatingSelector();
        $$->setAttribute(QualifiedName(namespacePrefix, $4,
                                   p->m_styleSheet->determineNamespace(namespacePrefix)));
        $$->m_match = CSSSelector::Set;
    }
    | '[' maybe_space namespace_selector attr_name match maybe_space ident_or_string maybe_space ']' {
        AtomicString namespacePrefix = $3;
        CSSParser* p = static_cast<CSSParser*>(parser);
        $$ = p->createFloatingSelector();
        $$->setAttribute(QualifiedName(namespacePrefix, $4,
                                   p->m_styleSheet->determineNamespace(namespacePrefix)));
        $$->m_match = (CSSSelector::Match)$5;
        $$->m_value = $7;
    }
  ;

match:
    '=' {
        $$ = CSSSelector::Exact;
    }
    | INCLUDES {
        $$ = CSSSelector::List;
    }
    | DASHMATCH {
        $$ = CSSSelector::Hyphen;
    }
    | BEGINSWITH {
        $$ = CSSSelector::Begin;
    }
    | ENDSWITH {
        $$ = CSSSelector::End;
    }
    | CONTAINS {
        $$ = CSSSelector::Contain;
    }
    ;

ident_or_string:
    IDENT
  | STRING
    ;

pseudo:
    ':' IDENT {
        $$ = static_cast<CSSParser*>(parser)->createFloatingSelector();
        $$->m_match = CSSSelector::PseudoClass;
        $2.lower();
        $$->m_value = $2;
        CSSSelector::PseudoType type = $$->pseudoType();
        if (type == CSSSelector::PseudoUnknown)
            $$ = 0;
        else if (type == CSSSelector::PseudoEmpty ||
                 type == CSSSelector::PseudoFirstChild ||
                 type == CSSSelector::PseudoFirstOfType ||
                 type == CSSSelector::PseudoLastChild ||
                 type == CSSSelector::PseudoLastOfType ||
                 type == CSSSelector::PseudoOnlyChild ||
                 type == CSSSelector::PseudoOnlyOfType) {
            CSSParser* p = static_cast<CSSParser*>(parser);
            Document* doc = p->document();
            if (doc)
                doc->setUsesSiblingRules(true);
        } else if (type == CSSSelector::PseudoFirstLine) {
            CSSParser* p = static_cast<CSSParser*>(parser);
            if (Document* doc = p->document())
                doc->setUsesFirstLineRules(true);
        } else if (type == CSSSelector::PseudoBefore ||
                   type == CSSSelector::PseudoAfter) {
            CSSParser* p = static_cast<CSSParser*>(parser);
            if (Document* doc = p->document())
                doc->setUsesBeforeAfterRules(true);
        }
    }
    | ':' ':' IDENT {
        $$ = static_cast<CSSParser*>(parser)->createFloatingSelector();
        $$->m_match = CSSSelector::PseudoElement;
        $3.lower();
        $$->m_value = $3;
        CSSSelector::PseudoType type = $$->pseudoType();
        if (type == CSSSelector::PseudoUnknown)
            $$ = 0;
        else if (type == CSSSelector::PseudoFirstLine) {
            CSSParser* p = static_cast<CSSParser*>(parser);
            if (Document* doc = p->document())
                doc->setUsesFirstLineRules(true);
        } else if (type == CSSSelector::PseudoBefore ||
                   type == CSSSelector::PseudoAfter) {
            CSSParser* p = static_cast<CSSParser*>(parser);
            if (Document* doc = p->document())
                doc->setUsesBeforeAfterRules(true);
        }
    }
    // used by :nth-*(ax+b)
    | ':' FUNCTION NTH ')' {
        CSSParser *p = static_cast<CSSParser*>(parser);
        $$ = p->createFloatingSelector();
        $$->m_match = CSSSelector::PseudoClass;
        $$->setArgument($3);
        $$->m_value = $2;
        CSSSelector::PseudoType type = $$->pseudoType();
        if (type == CSSSelector::PseudoUnknown)
            $$ = 0;
        else if (type == CSSSelector::PseudoNthChild ||
                 type == CSSSelector::PseudoNthOfType ||
                 type == CSSSelector::PseudoNthLastChild ||
                 type == CSSSelector::PseudoNthLastOfType) {
            if (p->document())
                p->document()->setUsesSiblingRules(true);
        }
    }
    // used by :nth-*
    | ':' FUNCTION INTEGER ')' {
        CSSParser *p = static_cast<CSSParser*>(parser);
        $$ = p->createFloatingSelector();
        $$->m_match = CSSSelector::PseudoClass;
        $$->setArgument(String::number($3));
        $$->m_value = $2;
        CSSSelector::PseudoType type = $$->pseudoType();
        if (type == CSSSelector::PseudoUnknown)
            $$ = 0;
        else if (type == CSSSelector::PseudoNthChild ||
                 type == CSSSelector::PseudoNthOfType ||
                 type == CSSSelector::PseudoNthLastChild ||
                 type == CSSSelector::PseudoNthLastOfType) {
            if (p->document())
                p->document()->setUsesSiblingRules(true);
        }
    }
    // used by :nth-*(odd/even) and :lang
    | ':' FUNCTION IDENT ')' {
        CSSParser *p = static_cast<CSSParser*>(parser);
        $$ = p->createFloatingSelector();
        $$->m_match = CSSSelector::PseudoClass;
        $$->setArgument($3);
        $2.lower();
        $$->m_value = $2;
        CSSSelector::PseudoType type = $$->pseudoType();
        if (type == CSSSelector::PseudoUnknown)
            $$ = 0;
        else if (type == CSSSelector::PseudoNthChild ||
                 type == CSSSelector::PseudoNthOfType ||
                 type == CSSSelector::PseudoNthLastChild ||
                 type == CSSSelector::PseudoNthLastOfType) {
            if (p->document())
                p->document()->setUsesSiblingRules(true);
        }
    }
    // used by :not
    | ':' NOTFUNCTION maybe_space simple_selector maybe_space ')' {
        if (!$4 || $4->simpleSelector() || $4->tagHistory())
            $$ = 0;
        else {
            CSSParser* p = static_cast<CSSParser*>(parser);
            $$ = p->createFloatingSelector();
            $$->m_match = CSSSelector::PseudoClass;
            $$->setSimpleSelector(p->sinkFloatingSelector($4));
            $2.lower();
            $$->m_value = $2;
        }
    }
  ;

declaration_list:
    declaration {
        $$ = $1;
    }
    | decl_list declaration {
        $$ = $1;
        if ( $2 )
            $$ = $2;
    }
    | decl_list {
        $$ = $1;
    }
    | error invalid_block_list error {
        $$ = false;
    }
    | error {
        $$ = false;
    }
    | decl_list error {
        $$ = $1;
    }
    | decl_list invalid_block_list {
        $$ = $1;
    }
    ;

decl_list:
    declaration ';' maybe_space {
        $$ = $1;
    }
    | declaration invalid_block_list ';' maybe_space {
        $$ = false;
    }
    | error ';' maybe_space {
        $$ = false;
    }
    | error invalid_block_list error ';' maybe_space {
        $$ = false;
    }
    | decl_list declaration ';' maybe_space {
        $$ = $1;
        if ($2)
            $$ = $2;
    }
    | decl_list error ';' maybe_space {
        $$ = $1;
    }
    | decl_list error invalid_block_list error ';' maybe_space {
        $$ = $1;
    }
    ;

declaration:
    property ':' maybe_space expr prio {
        $$ = false;
        CSSParser* p = static_cast<CSSParser*>(parser);
        if ($1 && $4) {
            p->m_valueList = p->sinkFloatingValueList($4);
            int oldParsedProperties = p->m_numParsedProperties;
            $$ = p->parseValue($1, $5);
            if (!$$)
                p->rollbackLastProperties(p->m_numParsedProperties - oldParsedProperties);
            delete p->m_valueList;
            p->m_valueList = 0;
        }
    }
    |
    variable_reference maybe_space {
        CSSParser* p = static_cast<CSSParser*>(parser);
        p->m_valueList = new CSSParserValueList;
        p->m_valueList->addValue(p->sinkFloatingValue($1));
        int oldParsedProperties = p->m_numParsedProperties;
        $$ = p->parseValue(CSSPropertyWebkitVariableDeclarationBlock, false);
        if (!$$)
            p->rollbackLastProperties(p->m_numParsedProperties - oldParsedProperties);
        delete p->m_valueList;
        p->m_valueList = 0;
    }
    |
    property error {
        $$ = false;
    }
    |
    property ':' maybe_space error expr prio {
        /* The default movable type template has letter-spacing: .none;  Handle this by looking for
        error tokens at the start of an expr, recover the expr and then treat as an error, cleaning
        up and deleting the shifted expr.  */
        $$ = false;
    }
    |
    property ':' maybe_space expr prio error {
        /* When we encounter something like p {color: red !important fail;} we should drop the declaration */
        $$ = false;
    }
    |
    IMPORTANT_SYM maybe_space {
        /* Handle this case: div { text-align: center; !important } Just reduce away the stray !important. */
        $$ = false;
    }
    |
    property ':' maybe_space {
        /* div { font-family: } Just reduce away this property with no value. */
        $$ = false;
    }
    |
    property ':' maybe_space error {
        /* if we come across rules with invalid values like this case: p { weight: *; }, just discard the rule */
        $$ = false;
    }
    |
    property invalid_block {
        /* if we come across: div { color{;color:maroon} }, ignore everything within curly brackets */
        $$ = false;
    }
  ;

property:
    IDENT maybe_space {
        $$ = cssPropertyID($1);
    }
  ;

prio:
    IMPORTANT_SYM maybe_space { $$ = true; }
    | /* empty */ { $$ = false; }
  ;

expr:
    term {
        CSSParser* p = static_cast<CSSParser*>(parser);
        $$ = p->createFloatingValueList();
        $$->addValue(p->sinkFloatingValue($1));
    }
    | expr operator term {
        CSSParser* p = static_cast<CSSParser*>(parser);
        $$ = $1;
        if ($$) {
            if ($2) {
                CSSParserValue v;
                v.id = 0;
                v.unit = CSSParserValue::Operator;
                v.iValue = $2;
                $$->addValue(v);
            }
            $$->addValue(p->sinkFloatingValue($3));
        }
    }
    | expr error {
        $$ = 0;
    }
  ;

operator:
    '/' maybe_space {
        $$ = '/';
    }
  | ',' maybe_space {
        $$ = ',';
    }
  | /* empty */ {
        $$ = 0;
  }
  ;

term:
  unary_term { $$ = $1; }
  | unary_operator unary_term { $$ = $2; $$.fValue *= $1; }
  | STRING maybe_space { $$.id = 0; $$.string = $1; $$.unit = CSSPrimitiveValue::CSS_STRING; }
  | IDENT maybe_space {
      $$.id = cssValueKeywordID($1);
      $$.unit = CSSPrimitiveValue::CSS_IDENT;
      $$.string = $1;
  }
  /* We might need to actually parse the number from a dimension, but we can't just put something that uses $$.string into unary_term. */
  | DIMEN maybe_space { $$.id = 0; $$.string = $1; $$.unit = CSSPrimitiveValue::CSS_DIMENSION; }
  | unary_operator DIMEN maybe_space { $$.id = 0; $$.string = $2; $$.unit = CSSPrimitiveValue::CSS_DIMENSION; }
  | URI maybe_space { $$.id = 0; $$.string = $1; $$.unit = CSSPrimitiveValue::CSS_URI; }
  | UNICODERANGE maybe_space { $$.id = 0; $$.string = $1; $$.unit = CSSPrimitiveValue::CSS_UNICODE_RANGE; }
  | hexcolor { $$.id = 0; $$.string = $1; $$.unit = CSSPrimitiveValue::CSS_PARSER_HEXCOLOR; }
  | '#' maybe_space { $$.id = 0; $$.string = CSSParserString(); $$.unit = CSSPrimitiveValue::CSS_PARSER_HEXCOLOR; } /* Handle error case: "color: #;" */
  /* FIXME: according to the specs a function can have a unary_operator in front. I know no case where this makes sense */
  | function {
      $$ = $1;
  }
  | variable_reference maybe_space {
      $$ = $1;
  }
  | '%' maybe_space {} /* Handle width: %; */
  ;

unary_term:
  INTEGER maybe_space { $$.id = 0; $$.isInt = true; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_NUMBER; }
  | FLOATTOKEN maybe_space { $$.id = 0; $$.isInt = false; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_NUMBER; }
  | PERCENTAGE maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_PERCENTAGE; }
  | PXS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_PX; }
  | CMS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_CM; }
  | MMS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_MM; }
  | INS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_IN; }
  | PTS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_PT; }
  | PCS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_PC; }
  | DEGS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_DEG; }
  | RADS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_RAD; }
  | GRADS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_GRAD; }
  | TURNS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_TURN; }
  | MSECS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_MS; }
  | SECS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_S; }
  | HERZ maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_HZ; }
  | KHERZ maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_KHZ; }
  | EMS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_EMS; }
  | QEMS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSParserValue::Q_EMS; }
  | EXS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_EXS; }
    ;

variable_reference:
  VARCALL {
      $$.id = 0;
      $$.string = $1;
      $$.unit = CSSPrimitiveValue::CSS_PARSER_VARIABLE_FUNCTION_SYNTAX;
  }
  ;

function:
    FUNCTION maybe_space expr ')' maybe_space {
        CSSParser* p = static_cast<CSSParser*>(parser);
        CSSParserFunction* f = p->createFloatingFunction();
        f->name = $1;
        f->args = p->sinkFloatingValueList($3);
        $$.id = 0;
        $$.unit = CSSParserValue::Function;
        $$.function = f;
    } |
    FUNCTION maybe_space error {
        CSSParser* p = static_cast<CSSParser*>(parser);
        CSSParserFunction* f = p->createFloatingFunction();
        f->name = $1;
        f->args = 0;
        $$.id = 0;
        $$.unit = CSSParserValue::Function;
        $$.function = f;
  }
  ;
/*
 * There is a constraint on the color that it must
 * have either 3 or 6 hex-digits (i.e., [0-9a-fA-F])
 * after the "#"; e.g., "#000" is OK, but "#abcd" is not.
 */
hexcolor:
  HEX maybe_space { $$ = $1; }
  | IDSEL maybe_space { $$ = $1; }
  ;


/* error handling rules */

save_block:
    closing_brace {
        $$ = 0;
    }
  | error closing_brace {
        $$ = 0;
    }
    ;

invalid_at:
    ATKEYWORD error invalid_block {
        $$ = 0;
    }
  | ATKEYWORD error ';' {
        $$ = 0;
    }
    ;

invalid_at_list:
    invalid_at maybe_sgml
  | invalid_at_list invalid_at maybe_sgml
  ;

invalid_import:
    import {
        $$ = 0;
    }
    ;

invalid_media:
    media {
        $$ = 0;
    }
    ;

invalid_rule:
    error invalid_block {
        $$ = 0;
    }

/*
  Seems like the two rules below are trying too much and violating
  http://www.hixie.ch/tests/evil/mixed/csserrorhandling.html

  | error ';' {
        $$ = 0;
    }
  | error '}' {
        $$ = 0;
    }
*/
    ;

invalid_block:
    '{' error invalid_block_list error closing_brace
  | '{' error closing_brace
    ;

invalid_block_list:
    invalid_block
  | invalid_block_list error invalid_block
;

%%