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package pkglint
import "netbsd.org/pkglint/regex"
// LinesLexer records the state when checking a list of lines from top to bottom.
type LinesLexer struct {
line *Line
index int
lines *Lines
}
func NewLinesLexer(lines *Lines) *LinesLexer {
llex := LinesLexer{nil, 0, lines}
llex.setIndex(0)
return &llex
}
// CurrentLine returns the line that the lexer is currently looking at.
// For the EOF, a virtual line with line number "EOF" is returned.
func (llex *LinesLexer) CurrentLine() *Line {
if llex.line != nil {
return llex.line
}
return NewLineEOF(llex.lines.Filename)
}
func (llex *LinesLexer) PreviousLine() *Line {
return llex.lines.Lines[llex.index-1]
}
func (llex *LinesLexer) EOF() bool {
return llex.line == nil
}
// Skip skips the current line.
func (llex *LinesLexer) Skip() bool {
if llex.EOF() {
return false
}
llex.next()
return true
}
func (llex *LinesLexer) Undo() {
llex.setIndex(llex.index - 1)
}
func (llex *LinesLexer) NextRegexp(re regex.Pattern) []string {
if trace.Tracing {
defer trace.Call(llex.CurrentLine().Text, re)()
}
if !llex.EOF() {
if m := match(llex.line.Text, re); m != nil {
llex.next()
return m
}
}
return nil
}
func (llex *LinesLexer) SkipRegexp(re regex.Pattern) bool {
return llex.NextRegexp(re) != nil
}
func (llex *LinesLexer) SkipPrefix(prefix string) bool {
if trace.Tracing {
defer trace.Call2(llex.CurrentLine().Text, prefix)()
}
if !llex.EOF() && hasPrefix(llex.line.Text, prefix) {
llex.next()
return true
}
return false
}
func (llex *LinesLexer) SkipText(text string) bool {
if trace.Tracing {
defer trace.Call2(llex.CurrentLine().Text, text)()
}
if !llex.EOF() && llex.line.Text == text {
llex.Skip()
return true
}
return false
}
func (llex *LinesLexer) SkipEmptyOrNote() bool {
if llex.SkipText("") {
return true
}
if llex.index == 0 {
fix := llex.CurrentLine().Autofix()
fix.Notef("Empty line expected before this line.")
fix.InsertBefore("")
fix.Apply()
} else {
fix := llex.PreviousLine().Autofix()
fix.Notef("Empty line expected after this line.")
fix.InsertAfter("")
fix.Apply()
}
return false
}
func (llex *LinesLexer) SkipContainsOrWarn(text string) bool {
result := llex.SkipText(text)
if !result {
llex.CurrentLine().Warnf("This line should contain the following text: %s", text)
}
return result
}
func (llex *LinesLexer) setIndex(index int) {
llex.index = index
if index < llex.lines.Len() {
llex.line = llex.lines.Lines[index]
} else {
llex.line = nil
}
}
func (llex *LinesLexer) next() { llex.setIndex(llex.index + 1) }
// MkLinesLexer records the state when checking a list of Makefile lines from top to bottom.
type MkLinesLexer struct {
mklines *MkLines
LinesLexer
}
func NewMkLinesLexer(mklines *MkLines) *MkLinesLexer {
return &MkLinesLexer{mklines, *NewLinesLexer(mklines.lines)}
}
func (mlex *MkLinesLexer) PreviousMkLine() *MkLine {
return mlex.mklines.mklines[mlex.index-1]
}
func (mlex *MkLinesLexer) CurrentMkLine() *MkLine {
return mlex.mklines.mklines[mlex.index]
}
func (mlex *MkLinesLexer) SkipIf(pred func(mkline *MkLine) bool) bool {
if !mlex.EOF() && pred(mlex.CurrentMkLine()) {
mlex.next()
return true
}
return false
}
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