Initial project import

tools/v/vlib/semver/parse.v

@@ -0,0 +1,82 @@
+module semver
+
+// * Private structs and functions.
+struct RawVersion {
+	prerelease string
+	metadata   string
+mut:
+	raw_ints []string
+}
+
+const ver_major = 0
+const ver_minor = 1
+const ver_patch = 2
+const versions = [ver_major, ver_minor, ver_patch]
+
+// TODO: Rewrite using regexps?
+// /(\d+)\.(\d+)\.(\d+)(?:\-([0-9A-Za-z-.]+))?(?:\+([0-9A-Za-z-]+))?/
+fn parse(input string) RawVersion {
+	mut raw_version := input
+	mut prerelease := ''
+	mut metadata := ''
+	plus_idx := raw_version.last_index_u8(`+`)
+	if plus_idx > 0 {
+		metadata = raw_version[(plus_idx + 1)..]
+		raw_version = raw_version[0..plus_idx]
+	}
+	hyphen_idx := raw_version.index_('-')
+	if hyphen_idx > 0 {
+		prerelease = raw_version[(hyphen_idx + 1)..]
+		raw_version = raw_version[0..hyphen_idx]
+	}
+	raw_ints := raw_version.split('.')
+	return RawVersion{
+		prerelease: prerelease
+		metadata:   metadata
+		raw_ints:   raw_ints
+	}
+}
+
+fn (ver RawVersion) is_valid() bool {
+	if ver.raw_ints.len != 3 {
+		return false
+	}
+	return is_valid_number(ver.raw_ints[ver_major]) && is_valid_number(ver.raw_ints[ver_minor])
+		&& is_valid_number(ver.raw_ints[ver_patch]) && is_valid_string(ver.prerelease)
+		&& is_valid_string(ver.metadata)
+}
+
+fn (ver RawVersion) is_missing(typ int) bool {
+	return typ >= ver.raw_ints.len - 1
+}
+
+fn (raw_ver RawVersion) coerce() !Version {
+	ver := raw_ver.complete()
+	if !is_valid_number(ver.raw_ints[ver_major]) {
+		return error('Invalid major version: ${ver.raw_ints}[ver_major]')
+	}
+	return ver.to_version()
+}
+
+fn (raw_ver RawVersion) complete() RawVersion {
+	mut raw_ints := raw_ver.raw_ints.clone()
+	for raw_ints.len < 3 {
+		raw_ints << '0'
+	}
+	return RawVersion{
+		prerelease: raw_ver.prerelease
+		metadata:   raw_ver.metadata
+		raw_ints:   raw_ints
+	}
+}
+
+fn (raw_ver RawVersion) validate() ?Version {
+	if !raw_ver.is_valid() {
+		return none
+	}
+	return raw_ver.to_version()
+}
+
+fn (raw_ver RawVersion) to_version() Version {
+	return Version{raw_ver.raw_ints[ver_major].int(), raw_ver.raw_ints[ver_minor].int(), raw_ver.raw_ints[ver_patch].int(), raw_ver.prerelease, raw_ver.metadata}
+}