diff options
Diffstat (limited to 'vendor/github.com/exponent-io/jsonpath/decoder.go')
| -rw-r--r-- | vendor/github.com/exponent-io/jsonpath/decoder.go | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/vendor/github.com/exponent-io/jsonpath/decoder.go b/vendor/github.com/exponent-io/jsonpath/decoder.go deleted file mode 100644 index 31de46c73..000000000 --- a/vendor/github.com/exponent-io/jsonpath/decoder.go +++ /dev/null @@ -1,210 +0,0 @@ -package jsonpath - -import ( - "encoding/json" - "io" -) - -// KeyString is returned from Decoder.Token to represent each key in a JSON object value. -type KeyString string - -// Decoder extends the Go runtime's encoding/json.Decoder to support navigating in a stream of JSON tokens. -type Decoder struct { - json.Decoder - - path JsonPath - context jsonContext -} - -// NewDecoder creates a new instance of the extended JSON Decoder. -func NewDecoder(r io.Reader) *Decoder { - return &Decoder{Decoder: *json.NewDecoder(r)} -} - -// SeekTo causes the Decoder to move forward to a given path in the JSON structure. -// -// The path argument must consist of strings or integers. Each string specifies an JSON object key, and -// each integer specifies an index into a JSON array. -// -// Consider the JSON structure -// -// { "a": [0,"s",12e4,{"b":0,"v":35} ] } -// -// SeekTo("a",3,"v") will move to the value referenced by the "a" key in the current object, -// followed by a move to the 4th value (index 3) in the array, followed by a move to the value at key "v". -// In this example, a subsequent call to the decoder's Decode() would unmarshal the value 35. -// -// SeekTo returns a boolean value indicating whether a match was found. -// -// Decoder is intended to be used with a stream of tokens. As a result it navigates forward only. -func (d *Decoder) SeekTo(path ...interface{}) (bool, error) { - - if len(path) == 0 { - return len(d.path) == 0, nil - } - last := len(path) - 1 - if i, ok := path[last].(int); ok { - path[last] = i - 1 - } - - for { - if d.path.Equal(path) { - return true, nil - } - _, err := d.Token() - if err == io.EOF { - return false, nil - } else if err != nil { - return false, err - } - } -} - -// Decode reads the next JSON-encoded value from its input and stores it in the value pointed to by v. This is -// equivalent to encoding/json.Decode(). -func (d *Decoder) Decode(v interface{}) error { - switch d.context { - case objValue: - d.context = objKey - break - case arrValue: - d.path.incTop() - break - } - return d.Decoder.Decode(v) -} - -// Path returns a slice of string and/or int values representing the path from the root of the JSON object to the -// position of the most-recently parsed token. -func (d *Decoder) Path() JsonPath { - p := make(JsonPath, len(d.path)) - copy(p, d.path) - return p -} - -// Token is equivalent to the Token() method on json.Decoder. The primary difference is that it distinguishes -// between strings that are keys and and strings that are values. String tokens that are object keys are returned as a -// KeyString rather than as a native string. -func (d *Decoder) Token() (json.Token, error) { - t, err := d.Decoder.Token() - if err != nil { - return t, err - } - - if t == nil { - switch d.context { - case objValue: - d.context = objKey - break - case arrValue: - d.path.incTop() - break - } - return t, err - } - - switch t := t.(type) { - case json.Delim: - switch t { - case json.Delim('{'): - if d.context == arrValue { - d.path.incTop() - } - d.path.push("") - d.context = objKey - break - case json.Delim('}'): - d.path.pop() - d.context = d.path.inferContext() - break - case json.Delim('['): - if d.context == arrValue { - d.path.incTop() - } - d.path.push(-1) - d.context = arrValue - break - case json.Delim(']'): - d.path.pop() - d.context = d.path.inferContext() - break - } - case float64, json.Number, bool: - switch d.context { - case objValue: - d.context = objKey - break - case arrValue: - d.path.incTop() - break - } - break - case string: - switch d.context { - case objKey: - d.path.nameTop(t) - d.context = objValue - return KeyString(t), err - case objValue: - d.context = objKey - case arrValue: - d.path.incTop() - } - break - } - - return t, err -} - -// Scan moves forward over the JSON stream consuming all the tokens at the current level (current object, current array) -// invoking each matching PathAction along the way. -// -// Scan returns true if there are more contiguous values to scan (for example in an array). -func (d *Decoder) Scan(ext *PathActions) (bool, error) { - - rootPath := d.Path() - - // If this is an array path, increment the root path in our local copy. - if rootPath.inferContext() == arrValue { - rootPath.incTop() - } - - for { - // advance the token position - _, err := d.Token() - if err != nil { - return false, err - } - - match: - var relPath JsonPath - - // capture the new JSON path - path := d.Path() - - if len(path) > len(rootPath) { - // capture the path relative to where the scan started - relPath = path[len(rootPath):] - } else { - // if the path is not longer than the root, then we are done with this scan - // return boolean flag indicating if there are more items to scan at the same level - return d.Decoder.More(), nil - } - - // match the relative path against the path actions - if node := ext.node.match(relPath); node != nil { - if node.action != nil { - // we have a match so execute the action - err = node.action(d) - if err != nil { - return d.Decoder.More(), err - } - // The action may have advanced the decoder. If we are in an array, advancing it further would - // skip tokens. So, if we are scanning an array, jump to the top without advancing the token. - if d.path.inferContext() == arrValue && d.Decoder.More() { - goto match - } - } - } - } -} |