47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
// Copyright 2016 Marapongo, Inc. All rights reserved.
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package ast
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import (
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"regexp"
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"strings"
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"github.com/marapongo/mu/pkg/util"
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)
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// NameDelimiter is what delimits Namespace and Name parts.
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const NameDelimiter = "/"
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var nameRegexp = regexp.MustCompile(nameRegexps)
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var nameRegexps = "(" + namePartRegexps + "\\" + NameDelimiter + ")*" + namePartRegexps
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var namePartRegexps = "[A-Za-z_][A-Za-z0-9_]*"
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// IsName checks whether a string is a legal Name.
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func IsName(s string) bool {
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return nameRegexp.FindString(s) == s
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}
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// AsName converts a given string to a Name, asserting its validity.
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func AsName(s string) Name {
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util.AssertMF(nameRegexp.MatchString(s), "Expected string '%v' to be a name (%v)", s, nameRegexps)
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return Name(s)
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}
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// Simple extracts the name portion of a Name (dropping any Namespace).
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func (nm Name) Simple() Name {
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ix := strings.LastIndex(string(nm), NameDelimiter)
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if ix == -1 {
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return nm
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}
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return nm[ix+1:]
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}
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// Namespace extracts the namespace portion of a Name (dropping the Name); this may be empty.
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func (nm Name) Namespace() Name {
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ix := strings.LastIndex(string(nm), NameDelimiter)
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if ix == -1 {
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return ""
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}
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return nm[:ix]
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}
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