mirror of
https://github.com/go-gitea/gitea
synced 2024-12-30 14:54:35 +01:00
65f17bfc31
The main purpose is to refactor the legacy `unknwon/com` package. 1. Remove most imports of `unknwon/com`, only `util/legacy.go` imports the legacy `unknwon/com` 2. Use golangci's depguard to process denied packages 3. Fix some incorrect values in golangci.yml, eg, the version should be quoted string `"1.18"` 4. Use correctly escaped content for `go-import` and `go-source` meta tags 5. Refactor `com.Expand` to our stable (and the same fast) `vars.Expand`, our `vars.Expand` can still return partially rendered content even if the template is not good (eg: key mistach).
93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package vars
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
"unicode"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
// ErrWrongSyntax represents a wrong syntax with a template
|
|
type ErrWrongSyntax struct {
|
|
Template string
|
|
}
|
|
|
|
func (err ErrWrongSyntax) Error() string {
|
|
return fmt.Sprintf("wrong syntax found in %s", err.Template)
|
|
}
|
|
|
|
// ErrVarMissing represents an error that no matched variable
|
|
type ErrVarMissing struct {
|
|
Template string
|
|
Var string
|
|
}
|
|
|
|
func (err ErrVarMissing) Error() string {
|
|
return fmt.Sprintf("the variable %s is missing for %s", err.Var, err.Template)
|
|
}
|
|
|
|
// Expand replaces all variables like {var} by `vars` map, it always returns the expanded string regardless of errors
|
|
// if error occurs, the error part doesn't change and is returned as it is.
|
|
func Expand(template string, vars map[string]string) (string, error) {
|
|
// in the future, if necessary, we can introduce some escape-char,
|
|
// for example: it will use `#' as a reversed char, templates will use `{#{}` to do escape and output char '{'.
|
|
var buf strings.Builder
|
|
var err error
|
|
|
|
posBegin := 0
|
|
strLen := len(template)
|
|
for posBegin < strLen {
|
|
// find the next `{`
|
|
pos := strings.IndexByte(template[posBegin:], '{')
|
|
if pos == -1 {
|
|
buf.WriteString(template[posBegin:])
|
|
break
|
|
}
|
|
|
|
// copy texts between vars
|
|
buf.WriteString(template[posBegin : posBegin+pos])
|
|
|
|
// find the var between `{` and `}`/end
|
|
posBegin += pos
|
|
posEnd := posBegin + 1
|
|
for posEnd < strLen {
|
|
if template[posEnd] == '}' {
|
|
posEnd++
|
|
break
|
|
} // in the future, if we need to support escape chars, we can do: if (isEscapeChar) { posEnd+=2 }
|
|
posEnd++
|
|
}
|
|
|
|
// the var part, it can be "{", "{}", "{..." or or "{...}"
|
|
part := template[posBegin:posEnd]
|
|
posBegin = posEnd
|
|
if part == "{}" || part[len(part)-1] != '}' {
|
|
// treat "{}" or "{..." as error
|
|
err = ErrWrongSyntax{Template: template}
|
|
buf.WriteString(part)
|
|
} else {
|
|
// now we get a valid key "{...}"
|
|
key := part[1 : len(part)-1]
|
|
keyFirst, _ := utf8.DecodeRuneInString(key)
|
|
if unicode.IsSpace(keyFirst) || unicode.IsPunct(keyFirst) || unicode.IsControl(keyFirst) {
|
|
// the if key doesn't start with a letter, then we do not treat it as a var now
|
|
buf.WriteString(part)
|
|
} else {
|
|
// look up in the map
|
|
if val, ok := vars[key]; ok {
|
|
buf.WriteString(val)
|
|
} else {
|
|
// write the non-existing var as it is
|
|
buf.WriteString(part)
|
|
err = ErrVarMissing{Template: template, Var: key}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return buf.String(), err
|
|
}
|