75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
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package constraints
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import (
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"strconv"
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)
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//go:generate ragel -G1 -Z raw_scan.rl
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//go:generate gofmt -w raw_scan.go
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// rawConstraint is a tokenization of a constraint string, used internally
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// as the first layer of parsing.
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type rawConstraint struct {
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op string
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sep string
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nums [3]string
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numCt int
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pre string
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meta string
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}
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// VersionSpec turns the receiver into a VersionSpec in a reasonable
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// default way. This method assumes that the raw constraint was already
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// validated, and will panic or produce undefined results if it contains
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// anything invalid.
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//
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// In particular, numbers are automatically marked as unconstrained if they
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// are omitted or set to wildcards, so the caller must apply any additional
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// validation rules on the usage of unconstrained numbers before calling.
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func (raw rawConstraint) VersionSpec() VersionSpec {
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return VersionSpec{
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Major: parseRawNumConstraint(raw.nums[0]),
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Minor: parseRawNumConstraint(raw.nums[1]),
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Patch: parseRawNumConstraint(raw.nums[2]),
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Prerelease: raw.pre,
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Metadata: raw.meta,
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}
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}
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var rawNumNames = [...]string{"major", "minor", "patch"}
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func isWildcardNum(s string) bool {
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switch s {
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case "*", "x", "X":
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return true
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default:
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return false
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}
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}
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// parseRawNum parses a raw number string which the caller has already
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// determined is non-empty and non-wildcard. If the string is not numeric
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// then this function will panic.
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func parseRawNum(s string) uint64 {
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v, err := strconv.ParseUint(s, 10, 64)
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if err != nil {
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panic(err)
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}
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return v
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}
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// parseRawNumConstraint parses a raw number into a NumConstraint, setting it
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// to unconstrained if the value is empty or a wildcard.
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func parseRawNumConstraint(s string) NumConstraint {
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switch {
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case s == "" || isWildcardNum(s):
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return NumConstraint{
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Unconstrained: true,
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}
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default:
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return NumConstraint{
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Num: parseRawNum(s),
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}
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}
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}
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