68 lines
2.6 KiB
Plaintext
68 lines
2.6 KiB
Plaintext
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Author: Jim Teeuwen <jimteeuwen@gmail.com>
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This package wraps the standard XML library and uses it to build a node tree of
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any document you load. This allows you to look up nodes forwards and backwards,
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as well as perform search queries (no xpath support yet).
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Nodes now simply become collections and don't require you to read them in the
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order in which the xml.Parser finds them.
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The Document currently implements 2 simple search functions which allow you to
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look for specific nodes.
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*document.SelectNode(namespace, name string) *Node;
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*document.SelectNodes(namespace, name string) []*Node;
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SelectNode() returns the first, single node it finds matching the given name
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and namespace. SelectNodes() returns a slice containing all the matching nodes.
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Note that these search functions can be invoked on individual nodes as well.
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This allows you to search only a subset of the entire document.
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Each node exposes also a number of functions which allow easy access to a node
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value or an attribute value. They come in various forms to allow transparent
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conversion to types like int, int64, float, float32, float64, etc:
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*node.GetValue(ns, name string) string;
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*node.GetValuei(ns, name string) int;
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*node.GetValuei64(ns, name string) int64;
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*node.GetValuef(ns, name string) float;
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*node.GetValuef32(ns, name string) float32;
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*node.GetValuef64(ns, name string) float64;
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Note that the GetValue() functions actually consider child nodes for matching
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names as well as the current node. In effect they first perform a
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node.SelectNode() and then return the value of the resulting node converted to
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the appripriate type. This allows you to do this:
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Consider this piece of xml:
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<car>
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<color>red</color>
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<brand>BMW</brand>
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</car>
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Now this code:
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node := doc.SelectNode("", "car");
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brand := node.GetValue("", "brand");
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Eventhough 'brand' is not the name of @node, we still get the right value
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back (BMW), because GetValue searches through the child nodes when looking
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for the value if the current node does not match the given namespace and
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name.
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For attributes, we only go through the attributes of the current node this
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function is invoked on:
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*node.GetAttr(ns, name string) string;
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*node.GetAttri(ns, name string) int;
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*node.GetAttri64(ns, name string) int64;
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*node.GetAttrf(ns, name string) float;
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*node.GetAttrf32(ns, name string) float32;
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*node.GetAttrf64(ns, name string) float64;
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All of these functions return either "" or 0 when the specified node or
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attribute could not be found. No errors are generated.
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