Mercurial > projects > sievemgr
view cmd/sievemgr/internal/config/scanner.go @ 19:854167f55839
Fix SRV record lookup
Do not use a configuration file default value for port in order to detect when
it is not set by the user so that SRV record lookup is triggered.
Depend on version 0.8.1 of go.guido-berhoerster.org/managesieve which contains
an additional necessary fix.
author | Guido Berhoerster <guido+sievemgr@berhoerster.name> |
---|---|
date | Wed, 03 Feb 2021 13:34:44 +0100 |
parents | 4dff4c3f0fbb |
children |
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// Copyright (C) 2020 Guido Berhoerster <guido+sievemgr@berhoerster.name> // // Permission is hereby granted, free of charge, to any person obtaining // a copy of this software and associated documentation files (the // "Software"), to deal in the Software without restriction, including // without limitation the rights to use, copy, modify, merge, publish, // distribute, sublicense, and/or sell copies of the Software, and to // permit persons to whom the Software is furnished to do so, subject to // the following conditions: // // The above copyright notice and this permission notice shall be included // in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. package config import ( "bufio" "fmt" "io" "strings" "unicode" ) type token int const ( tokenEOF token = -(iota + 1) tokenIllegal tokenIdent tokenNumber tokenString ) func (tok token) String() string { switch tok { case tokenIllegal: return "illegal" case tokenEOF: return "EOF" case tokenIdent: return "identifier" case tokenNumber: return "number" case tokenString: return "string" default: return "unknown" } } func isWhitespaceRune(r rune) bool { return r == ' ' || r == '\t' || r == '\r' || r == '\n' } func isIdentRune(r rune) bool { return r >= 'A' && r <= 'Z' || r >= 'a' && r <= 'z' } func isNumberRune(r rune) bool { return r >= '0' && r <= '9' } type scanner struct { br *bufio.Reader line int // line number for error messages r rune // last read rune rdSize int // last read size rdOffset int // offset from beginning of file } func newScanner(br *bufio.Reader) *scanner { return &scanner{line: 1, br: br} } func (s *scanner) read() error { var size int again: r, size, err := s.br.ReadRune() if err != nil { return err } // skip over BOM at the beginning of the file if r == bom && s.rdOffset == 0 { s.rdOffset += size goto again } if s.r == '\n' { s.line++ } s.r = r s.rdOffset += size s.rdSize = size if r == unicode.ReplacementChar && size == 1 { return fmt.Errorf("illegal UTF-8 sequence") } else if r == 0 { return fmt.Errorf("illegal nul byte") } return nil } func (s *scanner) unread() { if s.br.UnreadRune() != nil { return } if b, _ := s.br.Peek(1); b[0] == '\n' { // moved back to the previous line s.line-- } s.r = 0 s.rdOffset -= s.rdSize s.rdSize = 0 } func (s *scanner) skipWhitespace() error { for { if err := s.read(); err == io.EOF { break } else if err != nil { return err } else if !isWhitespaceRune(s.r) { s.unread() break } } return nil } func (s *scanner) scanIdent() (token, string, error) { var sb strings.Builder for { if err := s.read(); err == io.EOF { break } else if err != nil { return tokenIllegal, "", err } if isIdentRune(s.r) { sb.WriteRune(s.r) } else if isWhitespaceRune(s.r) { s.unread() break } else { return tokenIllegal, "", fmt.Errorf("illegal rune in identifier: %q", s.r) } } if sb.Len() == 0 { return tokenIllegal, "", fmt.Errorf("expected identifier, got %q", s.r) } return tokenIdent, sb.String(), nil } func (s *scanner) scanNumber() (token, string, error) { var sb strings.Builder for { if err := s.read(); err == io.EOF { break } else if err != nil { return tokenIllegal, "", err } if isNumberRune(s.r) { sb.WriteRune(s.r) } else if isWhitespaceRune(s.r) { s.unread() break } else { return tokenIllegal, "", fmt.Errorf("illegal rune in number: %q", s.r) } } if sb.Len() == 0 { return tokenIllegal, "", fmt.Errorf("expected number, got %q", s.r) } return tokenNumber, sb.String(), nil } func (s *scanner) scanString() (token, string, error) { if err := s.read(); err == io.EOF { return tokenIllegal, "", fmt.Errorf("unexpected EOF") } else if err != nil { return tokenIllegal, "", err } if s.r != '"' { return tokenIllegal, "", fmt.Errorf("expected '\"', got %q", s.r) } var sb strings.Builder var inEscape bool for { if err := s.read(); err == io.EOF { return tokenIllegal, "", fmt.Errorf("unterminated string") } else if err != nil { return tokenIllegal, "", err } if s.r == '\\' && !inEscape { inEscape = true } else if s.r == '"' && !inEscape { break } else { sb.WriteRune(s.r) inEscape = false } } return tokenString, sb.String(), nil } func (s *scanner) scan() (token, string, error) { if err := s.skipWhitespace(); err != nil { return tokenIllegal, "", err } if err := s.read(); err == io.EOF { return tokenEOF, "", nil } else if err != nil { return tokenIllegal, "", err } r := s.r s.unread() switch { case isIdentRune(r): return s.scanIdent() case isNumberRune(r): return s.scanNumber() case r == '"': return s.scanString() } return tokenIllegal, string(r), nil }