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package pkglint
import (
"netbsd.org/pkglint/textproc"
"strings"
)
type LoadOptions uint8
const (
MustSucceed LoadOptions = 1 << iota // It's a fatal error if loading fails.
NotEmpty // It is an error if the file is empty.
Makefile // Lines ending in a backslash are continued in the next line.
LogErrors //
)
func LoadMk(filename Path, options LoadOptions) *MkLines {
lines := Load(filename, options|Makefile)
if lines == nil {
return nil
}
return NewMkLines(lines)
}
func Load(filename Path, options LoadOptions) *Lines {
if fromCache := G.fileCache.Get(filename, options); fromCache != nil {
return fromCache
}
rawText, err := filename.ReadString()
if err != nil {
switch {
case options&MustSucceed != 0:
NewLineWhole(filename).Fatalf("Cannot be read.")
case options&LogErrors != 0:
NewLineWhole(filename).Errorf("Cannot be read.")
}
return nil
}
if rawText == "" && options&NotEmpty != 0 {
switch {
case options&MustSucceed != 0:
NewLineWhole(filename).Fatalf("Must not be empty.")
case options&LogErrors != 0:
NewLineWhole(filename).Errorf("Must not be empty.")
}
return nil
}
if G.Opts.Profiling {
G.loaded.Add(filename.Clean().String(), 1)
}
result := convertToLogicalLines(filename, rawText, options&Makefile != 0)
if filename.HasSuffixText(".mk") {
G.fileCache.Put(filename, options, result)
}
return result
}
func convertToLogicalLines(filename Path, rawText string, joinBackslashLines bool) *Lines {
var rawLines []*RawLine
for lineno, rawLine := range strings.SplitAfter(rawText, "\n") {
if rawLine != "" {
rawLines = append(rawLines, &RawLine{1 + lineno, rawLine, rawLine})
}
}
var loglines []*Line
if joinBackslashLines {
for lineno := 0; lineno < len(rawLines); {
line, nextLineno := nextLogicalLine(filename, rawLines, lineno)
loglines = append(loglines, line)
lineno = nextLineno
}
} else {
for _, rawLine := range rawLines {
text := strings.TrimSuffix(rawLine.textnl, "\n")
logline := NewLine(filename, rawLine.Lineno, text, rawLine)
loglines = append(loglines, logline)
}
}
if rawText != "" && !hasSuffix(rawText, "\n") {
loglines[len(loglines)-1].Errorf("File must end with a newline.")
}
return NewLines(filename, loglines)
}
func nextLogicalLine(filename Path, rawLines []*RawLine, index int) (*Line, int) {
{ // Handle the common case efficiently
rawLine := rawLines[index]
textnl := rawLine.textnl
if hasSuffix(textnl, "\n") && !hasSuffix(textnl, "\\\n") {
return NewLine(filename, rawLine.Lineno, textnl[:len(textnl)-1], rawLines[index]), index + 1
}
}
var text strings.Builder
firstlineno := rawLines[index].Lineno
var lineRawLines []*RawLine
interestingRawLines := rawLines[index:]
trim := ""
for i, rawLine := range interestingRawLines {
indent, rawText, outdent, cont := matchContinuationLine(rawLine.textnl)
if text.Len() == 0 {
text.WriteString(indent)
}
text.WriteString(strings.TrimPrefix(rawText, trim))
lineRawLines = append(lineRawLines, rawLine)
if cont != "" && i != len(interestingRawLines)-1 {
text.WriteString(" ")
index++
trim = textproc.NewLexer(rawText).NextString("#")
} else {
text.WriteString(outdent)
text.WriteString(cont)
break
}
}
lastlineno := rawLines[index].Lineno
return NewLineMulti(filename, firstlineno, lastlineno, text.String(), lineRawLines), index + 1
}
func matchContinuationLine(textnl string) (leadingWhitespace, text, trailingWhitespace, cont string) {
j := len(textnl)
if textnl[j-1] == '\n' {
j--
}
backslashes := 0
for j > 0 && textnl[j-1] == '\\' {
j--
backslashes++
}
cont = textnl[j : j+backslashes%2]
j += backslashes / 2
trailingEnd := j
for j > 0 && isHspace(textnl[j-1]) {
j--
}
trailingStart := j
trailingWhitespace = textnl[trailingStart:trailingEnd]
i := 0
leadingStart := i
for i < j && isHspace(textnl[i]) {
i++
}
leadingEnd := i
leadingWhitespace = textnl[leadingStart:leadingEnd]
text = textnl[leadingEnd:trailingStart]
return
}
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