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moby--moby/builder/parser/utils.go

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package parser
import (
"strconv"
"strings"
)
// dumps the AST defined by `node` as a list of sexps. Returns a string
// suitable for printing.
func (node *Node) Dump() string {
str := ""
str += node.Value
for _, n := range node.Children {
str += "(" + n.Dump() + ")\n"
}
if node.Next != nil {
for n := node.Next; n != nil; n = n.Next {
if len(n.Children) > 0 {
str += " " + n.Dump()
} else {
str += " " + strconv.Quote(n.Value)
}
}
}
return strings.TrimSpace(str)
}
// performs the dispatch based on the two primal strings, cmd and args. Please
// look at the dispatch table in parser.go to see how these dispatchers work.
func fullDispatch(cmd, args string) (*Node, map[string]bool, error) {
fn := dispatch[cmd]
// Ignore invalid Dockerfile instructions
if fn == nil {
fn = parseIgnore
}
sexp, attrs, err := fn(args)
if err != nil {
return nil, nil, err
}
return sexp, attrs, nil
}
// splitCommand takes a single line of text and parses out the cmd and args,
// which are used for dispatching to more exact parsing functions.
func splitCommand(line string) (string, string, error) {
var args string
// Make sure we get the same results irrespective of leading/trailing spaces
cmdline := TOKEN_WHITESPACE.Split(strings.TrimSpace(line), 2)
cmd := strings.ToLower(cmdline[0])
if len(cmdline) == 2 {
args = strings.TrimSpace(cmdline[1])
}
// the cmd should never have whitespace, but it's possible for the args to
// have trailing whitespace.
return cmd, args, nil
}
// covers comments and empty lines. Lines should be trimmed before passing to
// this function.
func stripComments(line string) string {
// string is already trimmed at this point
if TOKEN_COMMENT.MatchString(line) {
return TOKEN_COMMENT.ReplaceAllString(line, "")
}
return line
}