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package dockerfile2llb
import (
"bufio"
"io"
"regexp"
"strings"
)
const keySyntax = "syntax"
var reDirective = regexp.MustCompile(`^#\s*([a-zA-Z][a-zA-Z0-9]*)\s*=\s*(.+?)\s*$`)
func DetectSyntax(r io.Reader) (string, string, bool) {
directives := ParseDirectives(r)
if len(directives) == 0 {
return "", "", false
}
v, ok := directives[keySyntax]
if !ok {
return "", "", false
}
p := strings.SplitN(v, " ", 2)
return p[0], v, true
}
func ParseDirectives(r io.Reader) map[string]string {
m := map[string]string{}
s := bufio.NewScanner(r)
for s.Scan() {
match := reDirective.FindStringSubmatch(s.Text())
if len(match) == 0 {
return m
}
m[strings.ToLower(match[1])] = match[2]
}
return m
}
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