ScanState

本文整理汇总了Golang中fmt.ScanState类的典型用法代码示例。如果您正苦于以下问题：Golang ScanState类的具体用法？Golang ScanState怎么用？Golang ScanState使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

在下文中一共展示了ScanState类的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Golang代码示例。

示例1: scanEnum

// ScanEnum is a helper function to simplify the implementation of fmt.Scanner
// methods for "enum-like" types, that is, user-defined types where the set of
// values and string representations is fixed.
// ScanEnum allows multiple string representations for the same value.
//
// State is the state passed to the implementation of the fmt.Scanner method.
// Values holds as map values the values of the type, with their string
// representations as keys.
// If fold is true, comparison of the string representation uses
// strings.EqualFold, otherwise the equal operator for strings.
//
// On a match, ScanEnum stops after reading the last rune of the matched string,
// and returns the corresponding value together with a nil error.
// On no match, ScanEnum attempts to unread the last rune (the first rune that
// could not potentially match any of the values), and returns a non-nil error,
// together with a nil value for interface{}.
// On I/O error, ScanEnum returns the I/O error, together with a nil value for
// interface{}.
//
func scanEnum(state fmt.ScanState, values map[string]interface{}, fold bool) (
    interface{}, error) {
    //
    rd := make([]rune, 0, scanEnumBufferHint)
    keys := make(map[string]struct{}, len(values)) // potential keys
    for s, _ := range values {
        keys[s] = struct{}{}
    }
    for {
        r, _, err := state.ReadRune()
        if err != nil {
            return nil, err
        }
        rd = append(rd, r)
        srd := string(rd)
        lrd := len(srd)
        for s, _ := range keys {
            if strEq(srd, s, fold) {
                return values[s], nil
            }
            if len(rd) < len(s) && !strEq(srd, s[:lrd], fold) {
                delete(keys, s)
            }
        }
        if len(keys) == 0 {
            state.UnreadRune()
            return nil, fmt.Errorf("unsupported value %q", srd)
        }
    }
    panic("never reached")
}

开发者ID:0987363，项目名称:zfswatcher，代码行数:50，代码来源:scanenum.go

示例2: Scan

func (u *unit) Scan(state fmt.ScanState, verb rune) error {
    var x float64
    _, err := fmt.Fscan(state, &x)
    if err != nil {
        return err
    }
    tok, err := state.Token(false, unicode.IsLetter)
    if err != nil {
        return err
    }
    units := string(tok)
    switch units {
    case "ns", "", "b":
        // already in nanoseconds or bytes
    case "us":
        x *= 1e3
    case "ms":
        x *= 1e6
    case "s":
        x *= 1e9
    case "k", "kb", "K", "KB":
        x *= 1024
    case "m", "mb", "M", "MB":
        x *= 1024 * 1024
    default:
        return fmt.Errorf("unknown time or size unit %q", units)
    }
    *u = unit(x)
    return nil
}

开发者ID:zxpbenson，项目名称:rog-go，代码行数:30，代码来源:parse.go

示例3: Scan

// Scan is a support routine for fmt.Scanner; it sets z to the value of
// the scanned number. It accepts the decimal formats 'd' and 'f', and
// handles both equivalently. Bases 2, 8, 16 are not supported.
// The scale of z is the number of digits after the decimal point
// (including any trailing 0s), or 0 if there is no decimal point.
func (z *Dec) Scan(s fmt.ScanState, ch rune) error {
    if ch != 'd' && ch != 'f' && ch != 's' && ch != 'v' {
        return fmt.Errorf("Dec.Scan: invalid verb '%c'", ch)
    }
    s.SkipSpace()
    _, err := z.scan(s)
    return err
}

开发者ID:40a，项目名称:bootkube，代码行数:13，代码来源:dec.go

示例4: scanInt

func scanInt(state fmt.ScanState) (int, error) {
    token, err := state.Token(true, func(r rune) bool {
        return unicode.IsDigit(r)
    })
    if err != nil {
        return 0, err
    }
    res, err := strconv.ParseInt(string(token), 0, 64)
    return int(res), err
}

开发者ID:finkf，项目名称:gocropy，代码行数:10，代码来源:bbox.go

示例5: Scan

func (c *coords) Scan(state fmt.ScanState, verb rune) error {
    rx, _, _ := state.ReadRune()
    ry, _, _ := state.ReadRune()
    if rx < 'A' || 'G' < rx || ry < '1' || '8' < ry {
        return fmt.Errorf("Illegal chess coordinates: <%c, %c>", rx, ry)
    }
    c.x = int(rx - 'A')
    c.y = int(ry - '1')
    return nil
}

开发者ID:hraban，项目名称:chess，代码行数:10，代码来源:chess.go