libgo: Update to go1.6rc1.

    
    Reviewed-on: https://go-review.googlesource.com/19200

From-SVN: r233110

1 files changed, 82 insertions, 8 deletions

diff --git a/libgo/go/encoding/json/decode.go b/libgo/go/encoding/json/decode.go
index 530e852..539d952 100644
--- a/libgo/go/encoding/json/decode.go
+++ b/libgo/go/encoding/json/decode.go
@@ -37,6 +37,7 @@ import (
 // To unmarshal JSON into a struct, Unmarshal matches incoming object
 // keys to the keys used by Marshal (either the struct field name or its tag),
 // preferring an exact match but also accepting a case-insensitive match.
+// Unmarshal will only set exported fields of the struct.
 //
 // To unmarshal JSON into an interface value,
 // Unmarshal stores one of these in the interface value:
@@ -48,16 +49,26 @@ import (
 //	map[string]interface{}, for JSON objects
 //	nil for JSON null
 //
-// To unmarshal a JSON array into a slice, Unmarshal resets the slice to nil
-// and then appends each element to the slice.
+// To unmarshal a JSON array into a slice, Unmarshal resets the slice length
+// to zero and then appends each element to the slice.
+// As a special case, to unmarshal an empty JSON array into a slice,
+// Unmarshal replaces the slice with a new empty slice.
 //
-// To unmarshal a JSON object into a map, Unmarshal replaces the map
-// with an empty map and then adds key-value pairs from the object to
-// the map.
+// To unmarshal a JSON array into a Go array, Unmarshal decodes
+// JSON array elements into corresponding Go array elements.
+// If the Go array is smaller than the JSON array,
+// the additional JSON array elements are discarded.
+// If the JSON array is smaller than the Go array,
+// the additional Go array elements are set to zero values.
+//
+// To unmarshal a JSON object into a string-keyed map, Unmarshal first
+// establishes a map to use, If the map is nil, Unmarshal allocates a new map.
+// Otherwise Unmarshal reuses the existing map, keeping existing entries.
+// Unmarshal then stores key-value pairs from the JSON object into the map.
 //
 // If a JSON value is not appropriate for a given target type,
 // or if a JSON number overflows the target type, Unmarshal
-// skips that field and completes the unmarshalling as best it can.
+// skips that field and completes the unmarshaling as best it can.
 // If no more serious errors are encountered, Unmarshal returns
 // an UnmarshalTypeError describing the earliest such error.
 //
@@ -174,6 +185,66 @@ func (n Number) Int64() (int64, error) {
 	return strconv.ParseInt(string(n), 10, 64)
 }
 
+// isValidNumber reports whether s is a valid JSON number literal.
+func isValidNumber(s string) bool {
+	// This function implements the JSON numbers grammar.
+	// See https://tools.ietf.org/html/rfc7159#section-6
+	// and http://json.org/number.gif
+
+	if s == "" {
+		return false
+	}
+
+	// Optional -
+	if s[0] == '-' {
+		s = s[1:]
+		if s == "" {
+			return false
+		}
+	}
+
+	// Digits
+	switch {
+	default:
+		return false
+
+	case s[0] == '0':
+		s = s[1:]
+
+	case '1' <= s[0] && s[0] <= '9':
+		s = s[1:]
+		for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
+			s = s[1:]
+		}
+	}
+
+	// . followed by 1 or more digits.
+	if len(s) >= 2 && s[0] == '.' && '0' <= s[1] && s[1] <= '9' {
+		s = s[2:]
+		for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
+			s = s[1:]
+		}
+	}
+
+	// e or E followed by an optional - or + and
+	// 1 or more digits.
+	if len(s) >= 2 && (s[0] == 'e' || s[0] == 'E') {
+		s = s[1:]
+		if s[0] == '+' || s[0] == '-' {
+			s = s[1:]
+			if s == "" {
+				return false
+			}
+		}
+		for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
+			s = s[1:]
+		}
+	}
+
+	// Make sure we are at the end.
+	return s == ""
+}
+
 // decodeState represents the state while decoding a JSON value.
 type decodeState struct {
 	data       []byte
@@ -241,7 +312,7 @@ func (d *decodeState) scanWhile(op int) int {
 			newOp = d.scan.eof()
 			d.off = len(d.data) + 1 // mark processed EOF with len+1
 		} else {
-			c := int(d.data[d.off])
+			c := d.data[d.off]
 			d.off++
 			newOp = d.scan.step(&d.scan, c)
 		}
@@ -757,7 +828,7 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
 				d.saveError(err)
 				break
 			}
-			v.Set(reflect.ValueOf(b[0:n]))
+			v.SetBytes(b[:n])
 		case reflect.String:
 			v.SetString(string(s))
 		case reflect.Interface:
@@ -781,6 +852,9 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
 		default:
 			if v.Kind() == reflect.String && v.Type() == numberType {
 				v.SetString(s)
+				if !isValidNumber(s) {
+					d.error(fmt.Errorf("json: invalid number literal, trying to unmarshal %q into Number", item))
+				}
 				break
 			}
 			if fromQuoted {