mirror of
https://github.com/wader/fq.git
synced 2024-11-23 09:56:07 +03:00
559 lines
12 KiB
Go
559 lines
12 KiB
Go
package xml
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// object mode inspired by https://www.xml.com/pub/a/2006/05/31/converting-between-xml-and-json.html
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// TODO: keep <?xml>? root #desc?
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// TODO: refactor to share more code
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// TODO: rewrite ns stack
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import (
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"bufio"
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"bytes"
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"embed"
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"encoding/xml"
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"errors"
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"fmt"
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"html"
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"io"
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"regexp"
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"strconv"
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"strings"
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"unicode/utf8"
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"github.com/wader/fq/format"
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"github.com/wader/fq/internal/gojqx"
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"github.com/wader/fq/internal/sortx"
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"github.com/wader/fq/internal/stringsx"
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"github.com/wader/fq/pkg/bitio"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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"golang.org/x/exp/slices"
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)
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//go:embed xml.jq
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//go:embed xml.md
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var xmlFS embed.FS
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func init() {
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interp.RegisterFormat(
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format.XML,
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&decode.Format{
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Description: "Extensible Markup Language",
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ProbeOrder: format.ProbeOrderTextFuzzy,
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Groups: []*decode.Group{format.Probe},
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DecodeFn: decodeXML,
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DefaultInArg: format.XML_In{
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Seq: false,
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Array: false,
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AttributePrefix: "@",
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},
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Functions: []string{"_todisplay"},
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})
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interp.RegisterFS(xmlFS)
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interp.RegisterFunc1("to_xml", toXML)
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interp.RegisterFunc0("from_xmlentities", func(_ *interp.Interp, c string) any {
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return html.UnescapeString(c)
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})
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interp.RegisterFunc0("to_xmlentities", func(_ *interp.Interp, c string) any {
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return html.EscapeString(c)
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})
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}
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var whitespaceRE = regexp.MustCompile(`^\s*$`)
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type xmlNode struct {
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XMLName xml.Name
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Attrs []xml.Attr `xml:",attr"`
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Chardata []byte `xml:",chardata"`
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Comment []byte `xml:",comment"`
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Nodes []xmlNode `xml:",any"`
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}
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func (n *xmlNode) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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n.Attrs = start.Attr
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type node xmlNode
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return d.DecodeElement((*node)(n), &start)
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}
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type xmlNS struct {
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name string
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url string
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}
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// TODO: nss pop? attr not stack?
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// xmlNNStack is used to undo namespace url resolving, space is url not the "alias" name
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type xmlNNStack []xmlNS
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func (nss xmlNNStack) lookup(name xml.Name) string {
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var s string
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for i := len(nss) - 1; i >= 0; i-- {
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ns := nss[i]
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if name.Space == ns.url {
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// first found or is default namespace
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if s == "" || ns.name == "" {
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s = ns.name
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}
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if s == "" {
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break
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}
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}
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}
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return s
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}
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func (nss xmlNNStack) push(name string, url string) xmlNNStack {
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n := append([]xmlNS{}, nss...)
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n = append(n, xmlNS{name: name, url: url})
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return xmlNNStack(n)
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}
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func elmName(space, local string) string {
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if space == "" {
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return local
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}
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return space + ":" + local
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}
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func fromXMLToObject(n xmlNode, xi format.XML_In) any {
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var f func(n xmlNode, seq int, nss xmlNNStack) (string, any)
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f = func(n xmlNode, seq int, nss xmlNNStack) (string, any) {
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attrs := map[string]any{}
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for _, a := range n.Attrs {
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local, space := a.Name.Local, a.Name.Space
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if space == "xmlns" {
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nss = nss.push(local, a.Value)
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} else if local == "xmlns" {
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// track default namespace
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nss = nss.push("", a.Value)
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}
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}
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for _, a := range n.Attrs {
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local, space := a.Name.Local, a.Name.Space
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name := local
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if space != "" {
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if space == "xmlns" {
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// nop
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} else {
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space = nss.lookup(a.Name)
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}
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name = elmName(space, local)
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}
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attrs[xi.AttributePrefix+name] = a.Value
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}
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for i, nn := range n.Nodes {
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nSeq := i
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if len(n.Nodes) == 1 {
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nSeq = -1
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}
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nname, naddrs := f(nn, nSeq, nss)
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if e, ok := attrs[nname]; ok {
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if ea, ok := e.([]any); ok {
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attrs[nname] = append(ea, naddrs)
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} else {
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attrs[nname] = []any{e, naddrs}
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}
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} else {
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attrs[nname] = naddrs
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}
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}
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if xi.Seq && seq != -1 {
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attrs["#seq"] = seq
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}
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if attrs["#text"] == nil && !whitespaceRE.Match(n.Chardata) {
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attrs["#text"] = strings.TrimSpace(string(n.Chardata))
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}
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if attrs["#comment"] == nil && !whitespaceRE.Match(n.Comment) {
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attrs["#comment"] = strings.TrimSpace(string(n.Comment))
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}
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local, space := n.XMLName.Local, n.XMLName.Space
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if space != "" {
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space = nss.lookup(n.XMLName)
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}
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name := elmName(space, local)
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if len(attrs) == 0 {
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return name, ""
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} else if len(attrs) == 1 && attrs["#text"] != nil {
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return name, attrs["#text"]
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}
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return name, attrs
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}
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name, attrs := f(n, -1, nil)
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return map[string]any{name: attrs}
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}
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func fromXMLToArray(n xmlNode) any {
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var f func(n xmlNode, nss xmlNNStack) []any
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f = func(n xmlNode, nss xmlNNStack) []any {
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attrs := map[string]any{}
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for _, a := range n.Attrs {
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local, space := a.Name.Local, a.Name.Space
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if space == "xmlns" {
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nss = nss.push(local, a.Value)
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} else if local == "xmlns" {
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// track default namespace
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nss = nss.push("", a.Value)
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}
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}
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for _, a := range n.Attrs {
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local, space := a.Name.Local, a.Name.Space
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name := local
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if space != "" {
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if space == "xmlns" {
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// nop
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} else {
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space = nss.lookup(a.Name)
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}
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name = elmName(space, local)
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}
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attrs[name] = a.Value
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}
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if attrs["#text"] == nil && !whitespaceRE.Match(n.Chardata) {
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attrs["#text"] = strings.TrimSpace(string(n.Chardata))
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}
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if attrs["#comment"] == nil && !whitespaceRE.Match(n.Comment) {
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attrs["#comment"] = strings.TrimSpace(string(n.Comment))
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}
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nodes := []any{}
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for _, c := range n.Nodes {
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nodes = append(nodes, f(c, nss))
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}
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name := elmName(nss.lookup(n.XMLName), n.XMLName.Local)
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elm := []any{name}
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if len(attrs) > 0 {
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elm = append(elm, attrs)
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} else {
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// make attrs null if there were none, jq allows index into null
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elm = append(elm, nil)
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}
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elm = append(elm, nodes)
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return elm
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}
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return f(n, nil)
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}
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// from golang encoding/xml, copyright 2009 The Go Authors
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// the Char production of https://www.xml.com/axml/testaxml.htm,
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// Section 2.2 Characters.
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func isInCharacterRange(r rune) (inrange bool) {
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return r == 0x09 ||
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r == 0x0A ||
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r == 0x0D ||
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r >= 0x20 && r <= 0xD7FF ||
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r >= 0xE000 && r <= 0xFFFD ||
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r >= 0x10000 && r <= 0x10FFFF
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}
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func decodeXMLSeekFirstValidRune(br io.ReadSeeker) error {
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buf := bufio.NewReader(br)
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r, sz, err := buf.ReadRune()
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if err != nil {
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return err
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}
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if _, err := br.Seek(0, io.SeekStart); err != nil {
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return err
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}
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if r == utf8.RuneError && sz == 1 {
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return fmt.Errorf("invalid UTF-8")
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}
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if !isInCharacterRange(r) {
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return fmt.Errorf("illegal character code %U", r)
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}
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return nil
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}
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func decodeXML(d *decode.D) any {
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var xi format.XML_In
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d.ArgAs(&xi)
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bbr := d.RawLen(d.Len())
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var r any
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br := bitio.NewIOReadSeeker(bbr)
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// this reimplements same xml rune range validation as ecoding/xml but fails faster
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if err := decodeXMLSeekFirstValidRune(br); err != nil {
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d.Fatalf("%s", err)
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}
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xd := xml.NewDecoder(br)
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xd.Strict = false
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var n xmlNode
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if err := xd.Decode(&n); err != nil {
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d.Fatalf("%s", err)
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}
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if xi.Array {
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r = fromXMLToArray(n)
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} else {
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r = fromXMLToObject(n, xi)
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}
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var s scalar.Any
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s.Actual = r
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switch s.Actual.(type) {
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case map[string]any,
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[]any:
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default:
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d.Fatalf("root not object or array")
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}
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// continue decode to end and make sure there is only things we want to ignore
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for {
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d.SeekAbs(xd.InputOffset() * 8)
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t, err := xd.Token()
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if errors.Is(err, io.EOF) {
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break
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}
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switch t := t.(type) {
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case xml.CharData:
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if !whitespaceRE.Match([]byte(t)) {
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d.Fatalf("root element has trailing non-whitespace %q", stringsx.TrimN(string(t), 50, "..."))
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}
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// ignore trailing whitespace
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case xml.ProcInst:
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// ignore trailing process instructions <?elm?>
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case xml.StartElement:
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d.Fatalf("root element has trailing element <%s>", elmName(t.Name.Space, t.Name.Local))
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default:
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d.Fatalf("root element has trailing data")
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}
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}
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d.Value.V = &s
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d.Value.Range.Len = d.Len()
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return nil
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}
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func xmlNameFromStr(s string) xml.Name {
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return xml.Name{Local: s}
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}
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func xmlNameSort(a, b xml.Name) int {
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if a.Space != b.Space {
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if a.Space == "" {
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return 1
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}
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return strings.Compare(a.Space, b.Space)
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}
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return strings.Compare(a.Local, b.Local)
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}
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type ToXMLOpts struct {
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Indent int
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AttributePrefix string `default:"@"`
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}
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func toXMLFromObject(c any, opts ToXMLOpts) any {
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var f func(name string, content any) (xmlNode, int, bool)
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f = func(name string, content any) (xmlNode, int, bool) {
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n := xmlNode{
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XMLName: xml.Name{Local: name},
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}
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hasSeq := false
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seq := 0
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orderHasSeq := false
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var orderSeqs []int
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var orderNames []string
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switch v := content.(type) {
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case string:
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n.Chardata = []byte(v)
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case map[string]any:
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for k, v := range v {
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switch {
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case k == "#seq":
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hasSeq = true
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seq, _ = strconv.Atoi(v.(string))
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case k == "#text":
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s, _ := v.(string)
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n.Chardata = []byte(s)
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case k == "#comment":
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s, _ := v.(string)
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n.Comment = []byte(s)
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case strings.HasPrefix(k, opts.AttributePrefix):
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s, _ := v.(string)
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a := xml.Attr{
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Name: xmlNameFromStr(k[1:]),
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Value: s,
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}
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n.Attrs = append(n.Attrs, a)
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default:
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switch v := v.(type) {
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case []any:
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if len(v) > 0 {
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for _, c := range v {
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nn, nseq, nHasSeq := f(k, c)
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n.Nodes = append(n.Nodes, nn)
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orderNames = append(orderNames, k)
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orderSeqs = append(orderSeqs, nseq)
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orderHasSeq = orderHasSeq || nHasSeq
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}
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} else {
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nn, nseq, nHasSeq := f(k, "")
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n.Nodes = append(n.Nodes, nn)
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orderNames = append(orderNames, k)
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orderSeqs = append(orderSeqs, nseq)
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orderHasSeq = orderHasSeq || nHasSeq
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}
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default:
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nn, nseq, nHasSeq := f(k, v)
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n.Nodes = append(n.Nodes, nn)
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orderNames = append(orderNames, k)
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orderSeqs = append(orderSeqs, nseq)
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orderHasSeq = orderHasSeq || nHasSeq
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}
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}
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}
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}
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// if one #seq was found, assume all have them, otherwise sort by name
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if orderHasSeq {
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sortx.ProxySort(orderSeqs, n.Nodes, func(a, b int) bool { return a < b })
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} else {
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sortx.ProxySort(orderNames, n.Nodes, func(a, b string) bool { return a < b })
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}
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slices.SortFunc(n.Attrs, func(a, b xml.Attr) int { return xmlNameSort(a.Name, b.Name) })
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return n, seq, hasSeq
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}
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n, _, _ := f("doc", c)
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if len(n.Nodes) == 1 && len(n.Attrs) == 0 && n.Comment == nil && n.Chardata == nil {
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n = n.Nodes[0]
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}
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bb := &bytes.Buffer{}
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e := xml.NewEncoder(bb)
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e.Indent("", strings.Repeat(" ", opts.Indent))
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if err := e.Encode(n); err != nil {
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return err
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}
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if err := e.Flush(); err != nil {
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return err
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}
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return bb.String()
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}
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// ["elm", {attrs}, [children]] -> <elm attrs...>children...</elm>
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func toXMLFromArray(c any, opts ToXMLOpts) any {
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var f func(elm []any) (xmlNode, bool)
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f = func(elm []any) (xmlNode, bool) {
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var name string
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var attrs map[string]any
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var children []any
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for _, v := range elm {
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switch v := v.(type) {
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case string:
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if name == "" {
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name = v
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}
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case map[string]any:
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if attrs == nil {
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attrs = v
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}
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case []any:
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if children == nil {
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children = v
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}
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}
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}
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if name == "" {
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return xmlNode{}, false
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}
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n := xmlNode{
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XMLName: xmlNameFromStr(name),
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}
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for k, v := range attrs {
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switch k {
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case "#comment":
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s, _ := v.(string)
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n.Comment = []byte(s)
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case "#text":
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s, _ := v.(string)
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n.Chardata = []byte(s)
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default:
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s, _ := v.(string)
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n.Attrs = append(n.Attrs, xml.Attr{
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Name: xmlNameFromStr(k),
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Value: s,
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})
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}
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}
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slices.SortFunc(n.Attrs, func(a, b xml.Attr) int { return xmlNameSort(a.Name, b.Name) })
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for _, c := range children {
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c, ok := c.([]any)
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if !ok {
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continue
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}
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if cn, ok := f(c); ok {
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n.Nodes = append(n.Nodes, cn)
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}
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}
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return n, true
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}
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ca, ok := c.([]any)
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if !ok {
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return gojqx.FuncTypeError{Name: "to_xml", V: c}
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}
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n, ok := f(ca)
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if !ok {
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// TODO: better error
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return gojqx.FuncTypeError{Name: "to_xml", V: c}
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}
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bb := &bytes.Buffer{}
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e := xml.NewEncoder(bb)
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e.Indent("", strings.Repeat(" ", opts.Indent))
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if err := e.Encode(n); err != nil {
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return err
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}
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if err := e.Flush(); err != nil {
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return err
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}
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return bb.String()
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}
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func toXML(_ *interp.Interp, c any, opts ToXMLOpts) any {
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if v, ok := gojqx.Cast[map[string]any](c); ok {
|
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return toXMLFromObject(gojqx.NormalizeToStrings(v), opts)
|
|
} else if v, ok := gojqx.Cast[[]any](c); ok {
|
|
return toXMLFromArray(gojqx.NormalizeToStrings(v), opts)
|
|
}
|
|
return gojqx.FuncTypeError{Name: "to_xml", V: c}
|
|
}
|