1 files changed, 90 insertions, 0 deletions
diff --git a/src/selector/preFilter.js b/src/selector/preFilter.js
new file mode 100644
index 000000000..4a2fb489a
--- /dev/null
+++ b/src/selector/preFilter.js
@@ -0,0 +1,90 @@
+import rpseudo from "./var/rpseudo.js";
+import filterMatchExpr from "./filterMatchExpr.js";
+import unescapeSelector from "./unescapeSelector.js";
+import selectorError from "./selectorError.js";
+import tokenize from "./tokenize.js";
+
+var preFilter = {
+	ATTR: function( match ) {
+		match[ 1 ] = unescapeSelector( match[ 1 ] );
+
+		// Move the given value to match[3] whether quoted or unquoted
+		match[ 3 ] = unescapeSelector( match[ 3 ] || match[ 4 ] || match[ 5 ] || "" );
+
+		if ( match[ 2 ] === "~=" ) {
+			match[ 3 ] = " " + match[ 3 ] + " ";
+		}
+
+		return match.slice( 0, 4 );
+	},
+
+	CHILD: function( match ) {
+
+		/* matches from filterMatchExpr["CHILD"]
+			1 type (only|nth|...)
+			2 what (child|of-type)
+			3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
+			4 xn-component of xn+y argument ([+-]?\d*n|)
+			5 sign of xn-component
+			6 x of xn-component
+			7 sign of y-component
+			8 y of y-component
+		*/
+		match[ 1 ] = match[ 1 ].toLowerCase();
+
+		if ( match[ 1 ].slice( 0, 3 ) === "nth" ) {
+
+			// nth-* requires argument
+			if ( !match[ 3 ] ) {
+				selectorError( match[ 0 ] );
+			}
+
+			// numeric x and y parameters for jQuery.expr.filter.CHILD
+			// remember that false/true cast respectively to 0/1
+			match[ 4 ] = +( match[ 4 ] ?
+				match[ 5 ] + ( match[ 6 ] || 1 ) :
+				2 * ( match[ 3 ] === "even" || match[ 3 ] === "odd" )
+			);
+			match[ 5 ] = +( ( match[ 7 ] + match[ 8 ] ) || match[ 3 ] === "odd" );
+
+		// other types prohibit arguments
+		} else if ( match[ 3 ] ) {
+			selectorError( match[ 0 ] );
+		}
+
+		return match;
+	},
+
+	PSEUDO: function( match ) {
+		var excess,
+			unquoted = !match[ 6 ] && match[ 2 ];
+
+		if ( filterMatchExpr.CHILD.test( match[ 0 ] ) ) {
+			return null;
+		}
+
+		// Accept quoted arguments as-is
+		if ( match[ 3 ] ) {
+			match[ 2 ] = match[ 4 ] || match[ 5 ] || "";
+
+		// Strip excess characters from unquoted arguments
+		} else if ( unquoted && rpseudo.test( unquoted ) &&
+
+			// Get excess from tokenize (recursively)
+			( excess = tokenize( unquoted, true ) ) &&
+
+			// advance to the next closing parenthesis
+			( excess = unquoted.indexOf( ")", unquoted.length - excess ) -
+				unquoted.length ) ) {
+
+			// excess is a negative index
+			match[ 0 ] = match[ 0 ].slice( 0, excess );
+			match[ 2 ] = unquoted.slice( 0, excess );
+		}
+
+		// Return only captures needed by the pseudo filter method (type and argument)
+		return match.slice( 0, 3 );
+	}
+};
+
+export default preFilter;