mirror of https://github.com/poanetwork/quorum.git
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
package otto
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import (
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"fmt"
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"math"
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"regexp"
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"strconv"
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"unicode/utf16"
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)
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var matchLeading0Exponent = regexp.MustCompile(`([eE][\+\-])0+([1-9])`) // 1e-07 => 1e-7
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// FIXME
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// https://code.google.com/p/v8/source/browse/branches/bleeding_edge/src/conversions.cc?spec=svn18082&r=18082
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func floatToString(value float64, bitsize int) string {
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// TODO Fit to ECMA-262 9.8.1 specification
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if math.IsNaN(value) {
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return "NaN"
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} else if math.IsInf(value, 0) {
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if math.Signbit(value) {
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return "-Infinity"
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}
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return "Infinity"
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}
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exponent := math.Log10(math.Abs(value))
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if exponent >= 21 || exponent < -6 {
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return matchLeading0Exponent.ReplaceAllString(strconv.FormatFloat(value, 'g', -1, bitsize), "$1$2")
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}
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return strconv.FormatFloat(value, 'f', -1, bitsize)
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}
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func numberToStringRadix(value Value, radix int) string {
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float := value.float64()
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if math.IsNaN(float) {
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return "NaN"
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} else if math.IsInf(float, 1) {
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return "Infinity"
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} else if math.IsInf(float, -1) {
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return "-Infinity"
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}
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// FIXME This is very broken
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// Need to do proper radix conversion for floats, ...
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// This truncates large floats (so bad).
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return strconv.FormatInt(int64(float), radix)
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}
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func (value Value) string() string {
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if value.kind == valueString {
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switch value := value.value.(type) {
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case string:
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return value
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case []uint16:
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return string(utf16.Decode(value))
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}
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}
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if value.IsUndefined() {
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return "undefined"
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}
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if value.IsNull() {
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return "null"
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}
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switch value := value.value.(type) {
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case bool:
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return strconv.FormatBool(value)
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case int:
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return strconv.FormatInt(int64(value), 10)
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case int8:
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return strconv.FormatInt(int64(value), 10)
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case int16:
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return strconv.FormatInt(int64(value), 10)
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case int32:
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return strconv.FormatInt(int64(value), 10)
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case int64:
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return strconv.FormatInt(value, 10)
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case uint:
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return strconv.FormatUint(uint64(value), 10)
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case uint8:
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return strconv.FormatUint(uint64(value), 10)
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case uint16:
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return strconv.FormatUint(uint64(value), 10)
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case uint32:
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return strconv.FormatUint(uint64(value), 10)
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case uint64:
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return strconv.FormatUint(value, 10)
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case float32:
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if value == 0 {
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return "0" // Take care not to return -0
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}
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return floatToString(float64(value), 32)
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case float64:
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if value == 0 {
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return "0" // Take care not to return -0
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}
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return floatToString(value, 64)
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case []uint16:
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return string(utf16.Decode(value))
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case string:
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return value
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case *_object:
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return value.DefaultValue(defaultValueHintString).string()
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}
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panic(fmt.Errorf("%v.string( %T)", value.value, value.value))
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}
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