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github.com/antchfx/xmlquery

Package xmlquery

v1.3.3
Latest Go to latest

The highest tagged major version is .

Published: Oct 5, 2020 | License: MIT | Module: github.com/antchfx/xmlquery

Overview

Package xmlquery provides extract data from XML documents using XPath expression.

Index

Variables

var DisableSelectorCache = false

DisableSelectorCache will disable caching for the query selector if value is true.

var SelectorCacheMaxEntries = 50

SelectorCacheMaxEntries allows how many selector object can be caching. Default is 50. Will disable caching if SelectorCacheMaxEntries <= 0.

func AddAttr

func AddAttr(n *Node, key, val string)

AddAttr adds a new attribute specified by 'key' and 'val' to a node 'n'.

func AddChild

func AddChild(parent, n *Node)

AddChild adds a new node 'n' to a node 'parent' as its last child.

func AddSibling

func AddSibling(sibling, n *Node)

AddSibling adds a new node 'n' as a sibling of a given node 'sibling'. Note it is not necessarily true that the new node 'n' would be added immediately after 'sibling'. If 'sibling' isn't the last child of its parent, then the new node 'n' will be added at the end of the sibling chain of their parent.

func FindEach

func FindEach(top *Node, expr string, cb func(int, *Node))

FindEach searches the html.Node and calls functions cb. Important: this method is deprecated, instead, use for .. = range Find(){}.

func FindEachWithBreak

func FindEachWithBreak(top *Node, expr string, cb func(int, *Node) bool)

FindEachWithBreak functions the same as FindEach but allows to break the loop by returning false from the callback function `cb`. Important: this method is deprecated, instead, use .. = range Find(){}.

func RemoveFromTree

func RemoveFromTree(n *Node)

RemoveFromTree removes a node and its subtree from the document tree it is in. If the node is the root of the tree, then it's no-op.

type Node

type Node struct {
	Parent, FirstChild, LastChild, PrevSibling, NextSibling *Node

	Type         NodeType
	Data         string
	Prefix       string
	NamespaceURI string
	Attr         []xml.Attr
	// contains filtered or unexported fields
}

A Node consists of a NodeType and some Data (tag name for element nodes, content for text) and are part of a tree of Nodes.

func Find

func Find(top *Node, expr string) []*Node

Find is like QueryAll but panics if `expr` is not a valid XPath expression. See `QueryAll()` function.

func FindOne

func FindOne(top *Node, expr string) *Node

FindOne is like Query but panics if `expr` is not a valid XPath expression. See `Query()` function.

func LoadURL

func LoadURL(url string) (*Node, error)

LoadURL loads the XML document from the specified URL.

func Parse

func Parse(r io.Reader) (*Node, error)

Parse returns the parse tree for the XML from the given Reader.

func Query

func Query(top *Node, expr string) (*Node, error)

Query searches the XML Node that matches by the specified XPath expr, and returns first matched element.

func QueryAll

func QueryAll(top *Node, expr string) ([]*Node, error)

QueryAll searches the XML Node that matches by the specified XPath expr. Returns an error if the expression `expr` cannot be parsed.

func QuerySelector

func QuerySelector(top *Node, selector *xpath.Expr) *Node

QuerySelector returns the first matched XML Node by the specified XPath selector.

func QuerySelectorAll

func QuerySelectorAll(top *Node, selector *xpath.Expr) []*Node

QuerySelectorAll searches all of the XML Node that matches the specified XPath selectors.

func (*Node) InnerText

func (n *Node) InnerText() string

InnerText returns the text between the start and end tags of the object.

func (*Node) OutputXML

func (n *Node) OutputXML(self bool) string

OutputXML returns the text that including tags name.

func (*Node) SelectAttr

func (n *Node) SelectAttr(name string) string

SelectAttr returns the attribute value with the specified name.

func (*Node) SelectElement

func (n *Node) SelectElement(name string) *Node

SelectElement finds child elements with the specified name.

func (*Node) SelectElements

func (n *Node) SelectElements(name string) []*Node

SelectElements finds child elements with the specified name.

type NodeNavigator

type NodeNavigator struct {
	// contains filtered or unexported fields
}

func CreateXPathNavigator

func CreateXPathNavigator(top *Node) *NodeNavigator

CreateXPathNavigator creates a new xpath.NodeNavigator for the specified XML Node.

func (*NodeNavigator) Copy

func (x *NodeNavigator) Copy() xpath.NodeNavigator

func (*NodeNavigator) Current

func (x *NodeNavigator) Current() *Node

func (*NodeNavigator) LocalName

func (x *NodeNavigator) LocalName() string

func (*NodeNavigator) MoveTo

func (x *NodeNavigator) MoveTo(other xpath.NodeNavigator) bool

func (*NodeNavigator) MoveToChild

func (x *NodeNavigator) MoveToChild() bool

func (*NodeNavigator) MoveToFirst

func (x *NodeNavigator) MoveToFirst() bool

func (*NodeNavigator) MoveToNext

func (x *NodeNavigator) MoveToNext() bool

func (*NodeNavigator) MoveToNextAttribute

func (x *NodeNavigator) MoveToNextAttribute() bool

func (*NodeNavigator) MoveToParent

func (x *NodeNavigator) MoveToParent() bool

func (*NodeNavigator) MoveToPrevious

func (x *NodeNavigator) MoveToPrevious() bool

func (*NodeNavigator) MoveToRoot

func (x *NodeNavigator) MoveToRoot()

func (*NodeNavigator) NamespaceURL

func (x *NodeNavigator) NamespaceURL() string

func (*NodeNavigator) NodeType

func (x *NodeNavigator) NodeType() xpath.NodeType

func (*NodeNavigator) Prefix

func (x *NodeNavigator) Prefix() string

func (*NodeNavigator) String

func (x *NodeNavigator) String() string

func (*NodeNavigator) Value

func (x *NodeNavigator) Value() string

type NodeType

type NodeType uint

A NodeType is the type of a Node.

const (
	// DocumentNode is a document object that, as the root of the document tree,
	// provides access to the entire XML document.
	DocumentNode NodeType = iota
	// DeclarationNode is the document type declaration, indicated by the
	// following tag (for example, <!DOCTYPE...> ).
	DeclarationNode
	// ElementNode is an element (for example, <item> ).
	ElementNode
	// TextNode is the text content of a node.
	TextNode
	// CharDataNode node <![CDATA[content]]>
	CharDataNode
	// CommentNode a comment (for example, <!-- my comment --> ).
	CommentNode
	// AttributeNode is an attribute of element.
	AttributeNode
)

type StreamParser

type StreamParser struct {
	// contains filtered or unexported fields
}

StreamParser enables loading and parsing an XML document in a streaming fashion.

func CreateStreamParser

func CreateStreamParser(r io.Reader, streamElementXPath string, streamElementFilter ...string) (*StreamParser, error)

CreateStreamParser creates a StreamParser. Argument streamElementXPath is required. Argument streamElementFilter is optional and should only be used in advanced scenarios.

Scenario 1: simple case:

xml := `<AAA><BBB>b1</BBB><BBB>b2</BBB></AAA>`
sp, err := CreateStreamParser(strings.NewReader(xml), "/AAA/BBB")
if err != nil {
    panic(err)
}
for {
    n, err := sp.Read()
    if err != nil {
        break
    }
    fmt.Println(n.OutputXML(true))
}

Output will be:

<BBB>b1</BBB>
<BBB>b2</BBB>

Scenario 2: advanced case:

xml := `<AAA><BBB>b1</BBB><BBB>b2</BBB></AAA>`
sp, err := CreateStreamParser(strings.NewReader(xml), "/AAA/BBB", "/AAA/BBB[. != 'b1']")
if err != nil {
    panic(err)
}
for {
    n, err := sp.Read()
    if err != nil {
        break
    }
    fmt.Println(n.OutputXML(true))
}

Output will be:

<BBB>b2</BBB>

As the argument names indicate, streamElementXPath should be used for providing xpath query pointing to the target element node only, no extra filtering on the element itself or its children; while streamElementFilter, if needed, can provide additional filtering on the target element and its children.

CreateStreamParser returns an error if either streamElementXPath or streamElementFilter, if provided, cannot be successfully parsed and compiled into a valid xpath query.

func (*StreamParser) Read

func (sp *StreamParser) Read() (*Node, error)

Read returns a target node that satisfies the XPath specified by caller at StreamParser creation time. If there is no more satisfying target nodes after reading the rest of the XML document, io.EOF will be returned. At any time, any XML parsing error encountered will be returned, and the stream parsing stopped. Calling Read() after an error is returned (including io.EOF) results undefined behavior. Also note, due to the streaming nature, calling Read() will automatically remove any previous target node(s) from the document tree.

Package Files

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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