diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/robertkrimen/otto/value_number.go')
-rw-r--r-- | Godeps/_workspace/src/github.com/robertkrimen/otto/value_number.go | 324 |
1 files changed, 0 insertions, 324 deletions
diff --git a/Godeps/_workspace/src/github.com/robertkrimen/otto/value_number.go b/Godeps/_workspace/src/github.com/robertkrimen/otto/value_number.go deleted file mode 100644 index 54996c729..000000000 --- a/Godeps/_workspace/src/github.com/robertkrimen/otto/value_number.go +++ /dev/null @@ -1,324 +0,0 @@ -package otto - -import ( - "fmt" - "math" - "regexp" - "strconv" - "strings" -) - -var stringToNumberParseInteger = regexp.MustCompile(`^(?:0[xX])`) - -func parseNumber(value string) float64 { - value = strings.TrimSpace(value) - - if value == "" { - return 0 - } - - parseFloat := false - if strings.IndexRune(value, '.') != -1 { - parseFloat = true - } else if stringToNumberParseInteger.MatchString(value) { - parseFloat = false - } else { - parseFloat = true - } - - if parseFloat { - number, err := strconv.ParseFloat(value, 64) - if err != nil && err.(*strconv.NumError).Err != strconv.ErrRange { - return math.NaN() - } - return number - } - - number, err := strconv.ParseInt(value, 0, 64) - if err != nil { - return math.NaN() - } - return float64(number) -} - -func (value Value) float64() float64 { - switch value.kind { - case valueUndefined: - return math.NaN() - case valueNull: - return 0 - } - switch value := value.value.(type) { - case bool: - if value { - return 1 - } - return 0 - case int: - return float64(value) - case int8: - return float64(value) - case int16: - return float64(value) - case int32: - return float64(value) - case int64: - return float64(value) - case uint: - return float64(value) - case uint8: - return float64(value) - case uint16: - return float64(value) - case uint32: - return float64(value) - case uint64: - return float64(value) - case float64: - return value - case string: - return parseNumber(value) - case *_object: - return value.DefaultValue(defaultValueHintNumber).float64() - } - panic(fmt.Errorf("toFloat(%T)", value.value)) -} - -const ( - float_2_64 float64 = 18446744073709551616.0 - float_2_63 float64 = 9223372036854775808.0 - float_2_32 float64 = 4294967296.0 - float_2_31 float64 = 2147483648.0 - float_2_16 float64 = 65536.0 - integer_2_32 int64 = 4294967296 - integer_2_31 int64 = 2146483648 - sqrt1_2 float64 = math.Sqrt2 / 2 -) - -const ( - maxInt8 = math.MaxInt8 - minInt8 = math.MinInt8 - maxInt16 = math.MaxInt16 - minInt16 = math.MinInt16 - maxInt32 = math.MaxInt32 - minInt32 = math.MinInt32 - maxInt64 = math.MaxInt64 - minInt64 = math.MinInt64 - maxUint8 = math.MaxUint8 - maxUint16 = math.MaxUint16 - maxUint32 = math.MaxUint32 - maxUint64 = math.MaxUint64 - maxUint = ^uint(0) - minUint = 0 - maxInt = int(^uint(0) >> 1) - minInt = -maxInt - 1 - - // int64 - int64_maxInt int64 = int64(maxInt) - int64_minInt int64 = int64(minInt) - int64_maxInt8 int64 = math.MaxInt8 - int64_minInt8 int64 = math.MinInt8 - int64_maxInt16 int64 = math.MaxInt16 - int64_minInt16 int64 = math.MinInt16 - int64_maxInt32 int64 = math.MaxInt32 - int64_minInt32 int64 = math.MinInt32 - int64_maxUint8 int64 = math.MaxUint8 - int64_maxUint16 int64 = math.MaxUint16 - int64_maxUint32 int64 = math.MaxUint32 - - // float64 - float_maxInt float64 = float64(int(^uint(0) >> 1)) - float_minInt float64 = float64(int(-maxInt - 1)) - float_minUint float64 = float64(0) - float_maxUint float64 = float64(uint(^uint(0))) - float_minUint64 float64 = float64(0) - float_maxUint64 float64 = math.MaxUint64 - float_maxInt64 float64 = math.MaxInt64 - float_minInt64 float64 = math.MinInt64 -) - -func toIntegerFloat(value Value) float64 { - float := value.float64() - if math.IsInf(float, 0) { - } else if math.IsNaN(float) { - float = 0 - } else if float > 0 { - float = math.Floor(float) - } else { - float = math.Ceil(float) - } - return float -} - -type _numberKind int - -const ( - numberInteger _numberKind = iota // 3.0 => 3.0 - numberFloat // 3.14159 => 3.0, 1+2**63 > 2**63-1 - numberInfinity // Infinity => 2**63-1 - numberNaN // NaN => 0 -) - -type _number struct { - kind _numberKind - int64 int64 - float64 float64 -} - -// FIXME -// http://www.goinggo.net/2013/08/gustavos-ieee-754-brain-teaser.html -// http://bazaar.launchpad.net/~niemeyer/strepr/trunk/view/6/strepr.go#L160 -func (vl Value) number() (number _number) { - switch vl := vl.value.(type) { - case int8: - number.int64 = int64(vl) - return - case int16: - number.int64 = int64(vl) - return - case uint8: - number.int64 = int64(vl) - return - case uint16: - number.int64 = int64(vl) - return - case uint32: - number.int64 = int64(vl) - return - case int: - number.int64 = int64(vl) - return - case int64: - number.int64 = vl - return - } - - float := vl.float64() - if float == 0 { - return - } - - number.kind = numberFloat - number.float64 = float - - if math.IsNaN(float) { - number.kind = numberNaN - return - } - - if math.IsInf(float, 0) { - number.kind = numberInfinity - } - - if float >= float_maxInt64 { - number.int64 = math.MaxInt64 - return - } - - if float <= float_minInt64 { - number.int64 = math.MinInt64 - return - } - - integer := float64(0) - if float > 0 { - integer = math.Floor(float) - } else { - integer = math.Ceil(float) - } - - if float == integer { - number.kind = numberInteger - } - number.int64 = int64(float) - return -} - -// ECMA 262: 9.5 -func toInt32(value Value) int32 { - { - switch value := value.value.(type) { - case int8: - return int32(value) - case int16: - return int32(value) - case int32: - return value - } - } - floatValue := value.float64() - if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) { - return 0 - } - if floatValue == 0 { // This will work for +0 & -0 - return 0 - } - remainder := math.Mod(floatValue, float_2_32) - if remainder > 0 { - remainder = math.Floor(remainder) - } else { - remainder = math.Ceil(remainder) + float_2_32 - } - if remainder > float_2_31 { - return int32(remainder - float_2_32) - } - return int32(remainder) -} - -func toUint32(value Value) uint32 { - { - switch value := value.value.(type) { - case int8: - return uint32(value) - case int16: - return uint32(value) - case uint8: - return uint32(value) - case uint16: - return uint32(value) - case uint32: - return value - } - } - floatValue := value.float64() - if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) { - return 0 - } - if floatValue == 0 { - return 0 - } - remainder := math.Mod(floatValue, float_2_32) - if remainder > 0 { - remainder = math.Floor(remainder) - } else { - remainder = math.Ceil(remainder) + float_2_32 - } - return uint32(remainder) -} - -func toUint16(value Value) uint16 { - { - switch value := value.value.(type) { - case int8: - return uint16(value) - case uint8: - return uint16(value) - case uint16: - return value - } - } - floatValue := value.float64() - if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) { - return 0 - } - if floatValue == 0 { - return 0 - } - remainder := math.Mod(floatValue, float_2_16) - if remainder > 0 { - remainder = math.Floor(remainder) - } else { - remainder = math.Ceil(remainder) + float_2_16 - } - return uint16(remainder) -} |