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|
package main
import (
"io/ioutil"
"strings"
)
func LoadNonemptyLines(fname string, joinBackslashLines bool) []Line {
lines, err := readLines(fname, joinBackslashLines)
if err != nil {
NewLineWhole(fname).Errorf("Cannot be read.")
return nil
}
if len(lines) == 0 {
NewLineWhole(fname).Errorf("Must not be empty.")
return nil
}
return lines
}
func LoadExistingLines(fname string, joinBackslashLines bool) []Line {
lines, err := readLines(fname, joinBackslashLines)
if err != nil {
NewLineWhole(fname).Fatalf("Cannot be read.")
}
return lines
}
func nextLogicalLine(fname string, rawLines []*RawLine, pindex *int) Line {
{ // Handle the common case efficiently
index := *pindex
rawLine := rawLines[index]
textnl := rawLine.textnl
if hasSuffix(textnl, "\n") && !hasSuffix(textnl, "\\\n") {
*pindex = index + 1
return NewLine(fname, rawLine.Lineno, textnl[:len(textnl)-1], rawLines[index:index+1])
}
}
text := ""
index := *pindex
firstlineno := rawLines[index].Lineno
var lineRawLines []*RawLine
interestingRawLines := rawLines[index:]
for i, rawLine := range interestingRawLines {
indent, rawText, outdent, cont := splitRawLine(rawLine.textnl)
if text == "" {
text += indent
}
text += rawText
lineRawLines = append(lineRawLines, rawLine)
if cont != "" && i != len(interestingRawLines)-1 {
text += " "
index++
} else {
text += outdent + cont
break
}
}
lastlineno := rawLines[index].Lineno
*pindex = index + 1
return NewLineMulti(fname, firstlineno, lastlineno, text, lineRawLines)
}
func splitRawLine(textnl string) (leadingWhitespace, text, trailingWhitespace, cont string) {
end := len(textnl)
if end-1 >= 0 && textnl[end-1] == '\n' {
end--
}
backslashes := 0
for end-1 >= 0 && textnl[end-1] == '\\' {
end--
backslashes++
}
cont = textnl[end : end+backslashes%2]
end += backslashes / 2
trailingEnd := end
for end-1 >= 0 && (textnl[end-1] == ' ' || textnl[end-1] == '\t') {
end--
}
trailingStart := end
trailingWhitespace = textnl[trailingStart:trailingEnd]
i := 0
leadingStart := i
for i < end && (textnl[i] == ' ' || textnl[i] == '\t') {
i++
}
leadingEnd := i
leadingWhitespace = textnl[leadingStart:leadingEnd]
text = textnl[leadingEnd:trailingStart]
return
}
func readLines(fname string, joinBackslashLines bool) ([]Line, error) {
rawText, err := ioutil.ReadFile(fname)
if err != nil {
return nil, err
}
return convertToLogicalLines(fname, string(rawText), joinBackslashLines), nil
}
func convertToLogicalLines(fname string, rawText string, joinBackslashLines bool) []Line {
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); {
loglines = append(loglines, nextLogicalLine(fname, rawLines, &lineno))
}
} else {
for _, rawLine := range rawLines {
text := strings.TrimSuffix(rawLine.textnl, "\n")
logline := NewLine(fname, rawLine.Lineno, text, []*RawLine{rawLine})
loglines = append(loglines, logline)
}
}
if 0 < len(rawLines) && !hasSuffix(rawLines[len(rawLines)-1].textnl, "\n") {
NewLineEOF(fname).Errorf("File must end with a newline.")
}
return loglines
}
|
