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arf/parser/meta.go

48 lines
1.1 KiB
Go

package parser
import "git.tebibyte.media/sashakoshka/arf/lexer"
import "git.tebibyte.media/sashakoshka/arf/infoerr"
// parseMeta parsese the metadata header at the top of an arf file.
func (parser *ParsingOperation) parseMeta () (err error) {
for {
err = parser.expect (
lexer.TokenKindName,
lexer.TokenKindSeparator)
if err != nil { return }
if parser.token.Is(lexer.TokenKindSeparator) {
err = parser.nextToken(lexer.TokenKindNewline)
if err != nil { return }
err = parser.nextToken()
return
}
field := parser.token.Value().(string)
err = parser.nextToken(lexer.TokenKindString)
if err != nil { return }
value := parser.token.Value().(string)
switch field {
case "author":
parser.tree.author = value
case "license":
parser.tree.license = value
case "require":
parser.tree.requires = append(parser.tree.requires, value)
default:
parser.token.NewError (
"unrecognized metadata field: " + field,
infoerr.ErrorKindError)
}
err = parser.nextToken(lexer.TokenKindNewline)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
}
}