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|
package tagparser
import (
"github.com/vmihailenco/tagparser/internal/parser"
)
type Tag struct {
Name string
Options map[string]string
}
func (t *Tag) HasOption(name string) bool {
_, ok := t.Options[name]
return ok
}
func Parse(s string) *Tag {
p := &tagParser{
Parser: parser.NewString(s),
}
p.parseKey()
return &p.Tag
}
type tagParser struct {
*parser.Parser
Tag Tag
hasName bool
key string
}
func (p *tagParser) setTagOption(key, value string) {
if !p.hasName {
p.hasName = true
if key == "" {
p.Tag.Name = value
return
}
}
if p.Tag.Options == nil {
p.Tag.Options = make(map[string]string)
}
if key == "" {
p.Tag.Options[value] = ""
} else {
p.Tag.Options[key] = value
}
}
func (p *tagParser) parseKey() {
p.key = ""
var b []byte
for p.Valid() {
c := p.Read()
switch c {
case ',':
p.Skip(' ')
p.setTagOption("", string(b))
p.parseKey()
return
case ':':
p.key = string(b)
p.parseValue()
return
case '\'':
p.parseQuotedValue()
return
default:
b = append(b, c)
}
}
if len(b) > 0 {
p.setTagOption("", string(b))
}
}
func (p *tagParser) parseValue() {
const quote = '\''
c := p.Peek()
if c == quote {
p.Skip(quote)
p.parseQuotedValue()
return
}
var b []byte
for p.Valid() {
c = p.Read()
switch c {
case '\\':
b = append(b, p.Read())
case '(':
b = append(b, c)
b = p.readBrackets(b)
case ',':
p.Skip(' ')
p.setTagOption(p.key, string(b))
p.parseKey()
return
default:
b = append(b, c)
}
}
p.setTagOption(p.key, string(b))
}
func (p *tagParser) readBrackets(b []byte) []byte {
var lvl int
loop:
for p.Valid() {
c := p.Read()
switch c {
case '\\':
b = append(b, p.Read())
case '(':
b = append(b, c)
lvl++
case ')':
b = append(b, c)
lvl--
if lvl < 0 {
break loop
}
default:
b = append(b, c)
}
}
return b
}
func (p *tagParser) parseQuotedValue() {
const quote = '\''
var b []byte
b = append(b, quote)
for p.Valid() {
bb, ok := p.ReadSep(quote)
if !ok {
b = append(b, bb...)
break
}
if len(bb) > 0 && bb[len(bb)-1] == '\\' {
b = append(b, bb[:len(bb)-1]...)
b = append(b, quote)
continue
}
b = append(b, bb...)
b = append(b, quote)
break
}
p.setTagOption(p.key, string(b))
if p.Skip(',') {
p.Skip(' ')
}
p.parseKey()
}
func Unquote(s string) (string, bool) {
const quote = '\''
if len(s) < 2 {
return s, false
}
if s[0] == quote && s[len(s)-1] == quote {
return s[1 : len(s)-1], true
}
return s, false
}
|
