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60 lines
1.7 KiB
60 lines
1.7 KiB
/*
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Package param deserializes parameter values into a given struct using magical
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reflection ponies. Inspired by gorilla/schema, but uses Rails/jQuery style param
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encoding instead of their weird dotted syntax. In particular, this package was
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written with the intent of parsing the output of jQuery.param.
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This package uses struct tags to guess what names things ought to have. If a
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struct value has a "param" tag defined, it will use that. If there is no "param"
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tag defined, the name part of the "json" tag will be used. If that is not
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defined, the name of the field itself will be used (no case transformation is
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performed).
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If the name derived in this way is the string "-", param will refuse to set that
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value.
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The parser is extremely strict, and will return an error if it has any
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difficulty whatsoever in parsing any parameter, or if there is any kind of type
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mismatch.
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*/
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package param
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import (
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"net/url"
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"reflect"
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"strings"
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)
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// Parse the given arguments into the the given pointer to a struct object.
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func Parse(params url.Values, target interface{}) (err error) {
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v := reflect.ValueOf(target)
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defer func() {
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if r := recover(); r != nil {
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var ok bool
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err, ok = r.(error)
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if !ok {
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panic(err)
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}
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}
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}()
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if v.Kind() != reflect.Ptr || v.Elem().Kind() != reflect.Struct {
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pebkac("Target of param.Parse must be a pointer to a struct. "+
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"We instead were passed a %v", v.Type())
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}
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el := v.Elem()
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t := el.Type()
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cache := cacheStruct(t)
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for key, values := range params {
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sk, keytail := key, ""
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if i := strings.IndexRune(key, '['); i != -1 {
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sk, keytail = sk[:i], sk[i:]
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}
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parseStructField(cache, key, sk, keytail, values, el)
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}
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return nil
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}
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