86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
package goquery
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import (
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"code.google.com/p/go.net/html"
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)
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// First() reduces the set of matched elements to the first in the set.
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// It returns a new Selection object.
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func (this *Selection) First() *Selection {
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return this.Eq(0)
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}
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// Last() reduces the set of matched elements to the last in the set.
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// It returns a new Selection object.
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func (this *Selection) Last() *Selection {
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return this.Eq(-1)
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}
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// Eq() reduces the set of matched elements to the one at the specified index.
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// If a negative index is given, it counts backwards starting at the end of the
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// set. It returns a new Selection object, and an empty Selection object if the
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// index is invalid.
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func (this *Selection) Eq(index int) *Selection {
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if index < 0 {
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index += len(this.Nodes)
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}
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return this.Slice(index, index+1)
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}
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// Slice() reduces the set of matched elements to a subset specified by a range
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// of indices.
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func (this *Selection) Slice(start int, end int) *Selection {
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if start < 0 {
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start += len(this.Nodes)
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}
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if end < 0 {
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end += len(this.Nodes)
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}
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return pushStack(this, this.Nodes[start:end])
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}
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// Get() retrieves the underlying node at the specified index.
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// Get() without parameter is not implemented, since the node array is available
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// on the Selection object.
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func (this *Selection) Get(index int) *html.Node {
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if index < 0 {
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index += len(this.Nodes) // Negative index gets from the end
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}
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return this.Nodes[index]
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}
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// Index() returns the position of the first element within the Selection object
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// relative to its sibling elements.
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func (this *Selection) Index() int {
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if len(this.Nodes) > 0 {
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return newSingleSelection(this.Nodes[0], this.document).PrevAll().Length()
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}
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return -1
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}
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// IndexSelector() returns the position of the first element within the
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// Selection object relative to the elements matched by the selector, or -1 if
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// not found.
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func (this *Selection) IndexSelector(selector string) int {
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if len(this.Nodes) > 0 {
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sel := this.document.Find(selector)
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return indexInSlice(sel.Nodes, this.Nodes[0])
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}
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return -1
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}
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// IndexOfNode() returns the position of the specified node within the Selection
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// object, or -1 if not found.
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func (this *Selection) IndexOfNode(node *html.Node) int {
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return indexInSlice(this.Nodes, node)
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}
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// IndexOfSelection() returns the position of the first node in the specified
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// Selection object within this Selection object, or -1 if not found.
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func (this *Selection) IndexOfSelection(s *Selection) int {
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if s != nil && len(s.Nodes) > 0 {
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return indexInSlice(this.Nodes, s.Nodes[0])
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}
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return -1
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}
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