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Programming language: Go
Latest version: v1.1.8

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README

XPath

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XPath is Go package provides selecting nodes from XML, HTML or other documents using XPath expression.

Implementation

  • htmlquery - an XPath query package for HTML document

  • xmlquery - an XPath query package for XML document.

  • jsonquery - an XPath query package for JSON document

Supported Features

The basic XPath patterns.

The basic XPath patterns cover 90% of the cases that most stylesheets will need.

  • node : Selects all child elements with nodeName of node.

  • * : Selects all child elements.

  • @attr : Selects the attribute attr.

  • @* : Selects all attributes.

  • node() : Matches an org.w3c.dom.Node.

  • text() : Matches a org.w3c.dom.Text node.

  • comment() : Matches a comment.

  • . : Selects the current node.

  • .. : Selects the parent of current node.

  • / : Selects the document node.

  • a[expr] : Select only those nodes matching a which also satisfy the expression expr.

  • a[n] : Selects the nth matching node matching a When a filter's expression is a number, XPath selects based on position.

  • a/b : For each node matching a, add the nodes matching b to the result.

  • a//b : For each node matching a, add the descendant nodes matching b to the result.

  • //b : Returns elements in the entire document matching b.

  • a|b : All nodes matching a or b, union operation(not boolean or).

  • (a, b, c) : Evaluates each of its operands and concatenates the resulting sequences, in order, into a single result sequence

Node Axes

  • child::* : The child axis selects children of the current node.

  • descendant::* : The descendant axis selects descendants of the current node. It is equivalent to '//'.

  • descendant-or-self::* : Selects descendants including the current node.

  • attribute::* : Selects attributes of the current element. It is equivalent to @*

  • following-sibling::* : Selects nodes after the current node.

  • preceding-sibling::* : Selects nodes before the current node.

  • following::* : Selects the first matching node following in document order, excluding descendants.

  • preceding::* : Selects the first matching node preceding in document order, excluding ancestors.

  • parent::* : Selects the parent if it matches. The '..' pattern from the core is equivalent to 'parent::node()'.

  • ancestor::* : Selects matching ancestors.

  • ancestor-or-self::* : Selects ancestors including the current node.

  • self::* : Selects the current node. '.' is equivalent to 'self::node()'.

Expressions

The gxpath supported three types: number, boolean, string.

  • path : Selects nodes based on the path.

  • a = b : Standard comparisons.

    • a = b True if a equals b.
    • a != b True if a is not equal to b.
    • a < b True if a is less than b.
    • a <= b True if a is less than or equal to b.
    • a > b True if a is greater than b.
    • a >= b True if a is greater than or equal to b.
  • a + b : Arithmetic expressions.

    • - a Unary minus
    • a + b Add
    • a - b Substract
    • a * b Multiply
    • a div b Divide
    • a mod b Floating point mod, like Java.
  • a or b : Boolean or operation.

  • a and b : Boolean and operation.

  • (expr) : Parenthesized expressions.

  • fun(arg1, ..., argn) : Function calls:

Function Supported
boolean()
ceiling()
choose()
concat()
contains()
count()
current()
document()
element-available()
ends-with()
false()
floor()
format-number()
function-available()
generate-id()
id()
key()
lang()
last()
local-name()
name()
namespace-uri()
normalize-space()
not()
number()
position()
replace()
reverse()
round()
starts-with()
string()
string-length()
substring()
substring-after()
substring-before()
sum()
system-property()
translate()
true()
unparsed-entity-url()

Changelogs

2019-03-19

  • optimize XPath | operation performance. #33. Tips: suggest split into multiple subquery if you have a lot of | operations.

2019-01-29

  • improvement normalize-space function. #32

2018-12-07

  • supports XPath 2.0 Sequence expressions. #30 by @minherz.