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87 lines
1.7 KiB
Go
Vendored
87 lines
1.7 KiB
Go
Vendored
package types
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import (
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"fmt"
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"strings"
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)
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// An IntMode is a mode for parsing integer values, representing a set of
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// accepted bases.
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type IntMode uint8
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// IntMode values for ParseInt; can be combined using binary or.
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const (
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Dec IntMode = 1 << iota
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Hex
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Oct
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)
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// String returns a string representation of IntMode; e.g. `IntMode(Dec|Hex)`.
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func (m IntMode) String() string {
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var modes []string
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if m&Dec != 0 {
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modes = append(modes, "Dec")
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}
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if m&Hex != 0 {
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modes = append(modes, "Hex")
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}
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if m&Oct != 0 {
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modes = append(modes, "Oct")
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}
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return "IntMode(" + strings.Join(modes, "|") + ")"
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}
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var errIntAmbig = fmt.Errorf("ambiguous integer value; must include '0' prefix")
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func prefix0(val string) bool {
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return strings.HasPrefix(val, "0") || strings.HasPrefix(val, "-0")
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}
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func prefix0x(val string) bool {
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return strings.HasPrefix(val, "0x") || strings.HasPrefix(val, "-0x")
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}
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// ParseInt parses val using mode into intptr, which must be a pointer to an
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// integer kind type. Non-decimal value require prefix `0` or `0x` in the cases
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// when mode permits ambiguity of base; otherwise the prefix can be omitted.
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func ParseInt(intptr interface{}, val string, mode IntMode) error {
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val = strings.TrimSpace(val)
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verb := byte(0)
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switch mode {
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case Dec:
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verb = 'd'
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case Dec + Hex:
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if prefix0x(val) {
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verb = 'v'
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} else {
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verb = 'd'
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}
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case Dec + Oct:
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if prefix0(val) && !prefix0x(val) {
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verb = 'v'
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} else {
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verb = 'd'
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}
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case Dec + Hex + Oct:
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verb = 'v'
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case Hex:
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if prefix0x(val) {
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verb = 'v'
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} else {
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verb = 'x'
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}
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case Oct:
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verb = 'o'
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case Hex + Oct:
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if prefix0(val) {
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verb = 'v'
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} else {
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return errIntAmbig
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}
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}
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if verb == 0 {
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panic("unsupported mode")
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}
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return ScanFully(intptr, val, verb)
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}
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