diff options
Diffstat (limited to 'vendor/github.com/aws/aws-sdk-go/internal/ini/number_helper.go')
-rw-r--r-- | vendor/github.com/aws/aws-sdk-go/internal/ini/number_helper.go | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/vendor/github.com/aws/aws-sdk-go/internal/ini/number_helper.go b/vendor/github.com/aws/aws-sdk-go/internal/ini/number_helper.go new file mode 100644 index 000000000..a45c0bc56 --- /dev/null +++ b/vendor/github.com/aws/aws-sdk-go/internal/ini/number_helper.go @@ -0,0 +1,152 @@ +package ini + +import ( + "bytes" + "fmt" + "strconv" +) + +const ( + none = numberFormat(iota) + binary + octal + decimal + hex + exponent +) + +type numberFormat int + +// numberHelper is used to dictate what format a number is in +// and what to do for negative values. Since -1e-4 is a valid +// number, we cannot just simply check for duplicate negatives. +type numberHelper struct { + numberFormat numberFormat + + negative bool + negativeExponent bool +} + +func (b numberHelper) Exists() bool { + return b.numberFormat != none +} + +func (b numberHelper) IsNegative() bool { + return b.negative || b.negativeExponent +} + +func (b *numberHelper) Determine(c rune) error { + if b.Exists() { + return NewParseError(fmt.Sprintf("multiple number formats: 0%v", string(c))) + } + + switch c { + case 'b': + b.numberFormat = binary + case 'o': + b.numberFormat = octal + case 'x': + b.numberFormat = hex + case 'e', 'E': + b.numberFormat = exponent + case '-': + if b.numberFormat != exponent { + b.negative = true + } else { + b.negativeExponent = true + } + case '.': + b.numberFormat = decimal + default: + return NewParseError(fmt.Sprintf("invalid number character: %v", string(c))) + } + + return nil +} + +func (b numberHelper) CorrectByte(c rune) bool { + switch { + case b.numberFormat == binary: + if !isBinaryByte(c) { + return false + } + case b.numberFormat == octal: + if !isOctalByte(c) { + return false + } + case b.numberFormat == hex: + if !isHexByte(c) { + return false + } + case b.numberFormat == decimal: + if !isDigit(c) { + return false + } + case b.numberFormat == exponent: + if !isDigit(c) { + return false + } + case b.negativeExponent: + if !isDigit(c) { + return false + } + case b.negative: + if !isDigit(c) { + return false + } + default: + if !isDigit(c) { + return false + } + } + + return true +} + +func (b numberHelper) Base() int { + switch b.numberFormat { + case binary: + return 2 + case octal: + return 8 + case hex: + return 16 + default: + return 10 + } +} + +func (b numberHelper) String() string { + buf := bytes.Buffer{} + i := 0 + + switch b.numberFormat { + case binary: + i++ + buf.WriteString(strconv.Itoa(i) + ": binary format\n") + case octal: + i++ + buf.WriteString(strconv.Itoa(i) + ": octal format\n") + case hex: + i++ + buf.WriteString(strconv.Itoa(i) + ": hex format\n") + case exponent: + i++ + buf.WriteString(strconv.Itoa(i) + ": exponent format\n") + default: + i++ + buf.WriteString(strconv.Itoa(i) + ": integer format\n") + } + + if b.negative { + i++ + buf.WriteString(strconv.Itoa(i) + ": negative format\n") + } + + if b.negativeExponent { + i++ + buf.WriteString(strconv.Itoa(i) + ": negative exponent format\n") + } + + return buf.String() +} |