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zeekayandHanzo Dev
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Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
74 lines
2.1 KiB
Go
74 lines
2.1 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
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// SPDX-License-Identifier: MIT
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package vars
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import (
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"fmt"
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"strings"
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"unicode"
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"unicode/utf8"
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)
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// Expand replaces all variables like {var} by `vars` map, it always returns the expanded string regardless of errors
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// if error occurs, the error part doesn't change and is returned as it is.
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func Expand(template string, vars map[string]string) (string, error) {
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// in the future, if necessary, we can introduce some escape-char,
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// for example: it will use `#' as a reversed char, templates will use `{#{}` to do escape and output char '{'.
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var buf strings.Builder
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var err error
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posBegin := 0
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strLen := len(template)
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for posBegin < strLen {
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// find the next `{`
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pos := strings.IndexByte(template[posBegin:], '{')
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if pos == -1 {
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buf.WriteString(template[posBegin:])
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break
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}
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// copy texts between vars
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buf.WriteString(template[posBegin : posBegin+pos])
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// find the var between `{` and `}`/end
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posBegin += pos
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posEnd := posBegin + 1
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for posEnd < strLen {
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if template[posEnd] == '}' {
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posEnd++
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break
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} // in the future, if we need to support escape chars, we can do: if (isEscapeChar) { posEnd+=2 }
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posEnd++
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}
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// the var part, it can be "{", "{}", "{..." or or "{...}"
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part := template[posBegin:posEnd]
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posBegin = posEnd
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if part == "{}" || part[len(part)-1] != '}' {
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// treat "{}" or "{..." as error
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err = fmt.Errorf("wrong syntax found in %s", template)
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buf.WriteString(part)
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} else {
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// now we get a valid key "{...}"
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key := part[1 : len(part)-1]
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keyFirst, _ := utf8.DecodeRuneInString(key)
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if unicode.IsSpace(keyFirst) || unicode.IsPunct(keyFirst) || unicode.IsControl(keyFirst) {
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// if the key doesn't start with a letter, then we do not treat it as a var now
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buf.WriteString(part)
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} else {
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// look up in the map
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if val, ok := vars[key]; ok {
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buf.WriteString(val)
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} else {
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// write the non-existing var as it is
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buf.WriteString(part)
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err = fmt.Errorf("the variable %s is missing for %s", key, template)
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}
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}
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}
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}
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return buf.String(), err
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}
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