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package main
import (
"bytes"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/ChrisTrenkamp/goxpath"
"github.com/ChrisTrenkamp/goxpath/tree"
"github.com/ChrisTrenkamp/goxpath/tree/xmltree"
)
type namespace map[string]string
func (n *namespace) String() string {
return fmt.Sprint(*n)
}
func (n *namespace) Set(value string) error {
nsMap := strings.Split(value, "=")
if len(nsMap) != 2 {
nsErr = fmt.Errorf("Invalid namespace mapping: %s\n", value)
}
(*n)[nsMap[0]] = nsMap[1]
return nil
}
type variables map[string]string
func (v *variables) String() string {
return fmt.Sprint(*v)
}
func (v *variables) Set(value string) error {
varMap := strings.Split(value, "=")
if len(varMap) != 2 {
nsErr = fmt.Errorf("Invalid variable mapping: %s\n", value)
}
(*v)[varMap[0]] = varMap[1]
return nil
}
var rec bool
var value bool
var ns = make(namespace)
var vars = make(variables)
var nsErr error
var unstrict bool
var noFileName bool
var args = []string{}
var stdin io.Reader = os.Stdin
var stdout io.ReadWriter = os.Stdout
var stderr io.ReadWriter = os.Stderr
var retCode = 0
func main() {
exec()
os.Exit(retCode)
}
func exec() {
flag.BoolVar(&rec, "r", false, "Recursive")
flag.BoolVar(&value, "v", false, "Output the string value of the XPath result")
flag.Var(&ns, "ns", "Namespace mappings. e.g. -ns myns=http://example.com")
flag.Var(&vars, "var", "Variables mappings. e.g. -var myvar=myvalue")
flag.BoolVar(&unstrict, "u", false, "Turns off strict XML validation")
flag.BoolVar(&noFileName, "h", false, "Suppress filename prefixes.")
flag.Parse()
args = flag.Args()
if nsErr != nil {
fmt.Fprintf(stderr, nsErr.Error())
retCode = 1
return
}
if len(args) < 1 {
fmt.Fprintf(stderr, "Specify an XPath expression with one or more files, or pipe the XML from stdin. Run 'goxpath --help' for more information.\n")
retCode = 1
return
}
xp, err := goxpath.Parse(args[0])
if err != nil {
fmt.Fprintf(stderr, "%s\n", err.Error())
retCode = 1
return
}
if len(args) == 1 {
ret, err := runXPath(xp, stdin, ns, value)
if err != nil {
fmt.Fprintf(stderr, "%s\n", err.Error())
retCode = 1
}
printResult(ret, "")
}
for i := 1; i < len(args); i++ {
procPath(args[i], xp, ns, value)
}
}
func procPath(path string, x goxpath.XPathExec, ns namespace, value bool) {
fi, err := os.Stat(path)
if err != nil {
fmt.Fprintf(stderr, "Could not open file: %s\n", path)
retCode = 1
return
}
if fi.IsDir() {
procDir(path, x, ns, value)
return
}
data, _ := ioutil.ReadFile(path)
ret, err := runXPath(x, bytes.NewBuffer(data), ns, value)
if err != nil {
fmt.Fprintf(stderr, "%s: %s\n", path, err.Error())
retCode = 1
}
printResult(ret, path)
}
func printResult(ret []string, path string) {
for _, j := range ret {
if (len(flag.Args()) > 2 || rec) && !noFileName {
fmt.Fprintf(stdout, "%s:", path)
}
fmt.Fprintf(stdout, "%s\n", j)
}
}
func procDir(path string, x goxpath.XPathExec, ns namespace, value bool) {
if !rec {
fmt.Fprintf(stderr, "%s: Is a directory\n", path)
retCode = 1
return
}
list, _ := ioutil.ReadDir(path)
for _, i := range list {
procPath(filepath.Join(path, i.Name()), x, ns, value)
}
}
func runXPath(x goxpath.XPathExec, r io.Reader, ns namespace, value bool) ([]string, error) {
t, err := xmltree.ParseXML(r, func(o *xmltree.ParseOptions) {
o.Strict = !unstrict
})
if err != nil {
return nil, err
}
res, err := x.Exec(t, func(o *goxpath.Opts) {
o.NS = ns
for k, v := range vars {
o.Vars[k] = tree.String(v)
}
})
if err != nil {
return nil, err
}
var ret []string
if nodes, ok := res.(tree.NodeSet); ok && !value {
ret = make([]string, len(nodes))
for i, v := range nodes {
ret[i], _ = goxpath.MarshalStr(v)
ret[i] = strings.Replace(ret[i], "\n", " ", -1)
}
} else {
str := res.String()
if str != "" {
ret = strings.Split(str, "\n")
}
}
return ret, nil
}
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