116 lines
2.1 KiB
Go
116 lines
2.1 KiB
Go
|
package nginx
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"regexp"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
var ErrNullReceiver = fmt.Errorf("decoder receiver must not be null")
|
||
|
|
var ErrInvalidReceiver = fmt.Errorf("decoder receiver must be compatible with *[]*Line")
|
||
|
|
|
||
|
|
// decoder implements parser.Decoder
|
||
|
|
type decoder struct{ reader io.Reader }
|
||
|
|
|
||
|
|
func (d *decoder) Decode(v interface{}) error {
|
||
|
|
|
||
|
|
// check 'v'
|
||
|
|
if v == nil {
|
||
|
|
return ErrNullReceiver
|
||
|
|
}
|
||
|
|
vcast, ok := v.(*[]*Line)
|
||
|
|
if !ok {
|
||
|
|
return ErrInvalidReceiver
|
||
|
|
}
|
||
|
|
|
||
|
|
r := bufio.NewReader(d.reader)
|
||
|
|
n := -1 // line number
|
||
|
|
|
||
|
|
// regexes
|
||
|
|
reSection := regexp.MustCompile(`(?m)^([a-z0-9_-]+)\s+\{$`)
|
||
|
|
reAssign := regexp.MustCompile(`(?m)^([a-z0-9_-]+)\s+([^;#]+);$`)
|
||
|
|
reInclude := regexp.MustCompile(`(?m)^include\s+([^;#]+);$`)
|
||
|
|
|
||
|
|
// actual section tree
|
||
|
|
// tree := []Line{}
|
||
|
|
|
||
|
|
for {
|
||
|
|
n++
|
||
|
|
|
||
|
|
l := &Line{Number: n, Type: NONE}
|
||
|
|
|
||
|
|
// 1. read line
|
||
|
|
notrim, err := r.ReadString('\n')
|
||
|
|
if err == io.EOF {
|
||
|
|
break
|
||
|
|
} else if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// 2. ignore empty
|
||
|
|
line := strings.Trim(notrim, " \t\r\n")
|
||
|
|
if len(line) < 1 {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
// 3. get indentation
|
||
|
|
firstChar := 0
|
||
|
|
for ; !in_array(" \t\r\n", notrim[firstChar:][0]); firstChar++ {
|
||
|
|
}
|
||
|
|
l.Indent = notrim[0:firstChar]
|
||
|
|
|
||
|
|
// 3. comment
|
||
|
|
if line[0] == '#' {
|
||
|
|
l.Type = COMMENT
|
||
|
|
l.Components = []string{strings.Trim(line[1:], " \t")}
|
||
|
|
} else if line[0] == ';' {
|
||
|
|
l.Type = COLONCOMMENT
|
||
|
|
l.Components = []string{strings.Trim(line[1:], " \t")}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 4. section
|
||
|
|
if l.Type == NONE {
|
||
|
|
match := reSection.FindStringSubmatch(line)
|
||
|
|
if match != nil {
|
||
|
|
l.Type = SECTION
|
||
|
|
l.Components = match[1:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 5. include
|
||
|
|
if l.Type == NONE {
|
||
|
|
match := reInclude.FindStringSubmatch(line)
|
||
|
|
if match != nil {
|
||
|
|
l.Type = INCLUDE
|
||
|
|
l.Components = []string{match[1]}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 6. assignment
|
||
|
|
if l.Type == NONE {
|
||
|
|
match := reAssign.FindStringSubmatch(line)
|
||
|
|
if match != nil {
|
||
|
|
l.Type = ASSIGNMENT
|
||
|
|
l.Components = match[1:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
*vcast = append(*vcast, l)
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func in_array(haystack string, needle byte) bool {
|
||
|
|
for i, l := 0, len(haystack); i < l; i++ {
|
||
|
|
if haystack[i] == needle {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|