// Parses the given line as a gcc line marker and returns the contained
// filename.
func parseLineMarker(line string) string {
// A line marker contains the line number and filename and looks like:
// # 123 /path/to/file.cpp
// It can be followed by zero or more flag number that indicate the
// preprocessor state and can be ignored.
// For exact details on this format, see:
// https://github.com/gcc-mirror/gcc/blob/edd716b6b1caa1a5cb320a8cd7f626f30198e098/gcc/c-family/c-ppoutput.c#L413-L415
split := strings.SplitN(line, " ", 3)
if len(split) < 2 || split[0] != "#" {
return ""
}
_, err := strconv.Atoi(split[1])
if err != nil {
return ""
}
// If we get here, we found a # followed by a line number, so
// assume this is a line marker and see if the rest of the line
// starts with a string containing the filename
str, rest, ok := utils.ParseCppString(split[2])
if ok && (rest == "" || rest[0] == ' ') {
return str
}
return ""
}
func TestParseCppString(t *testing.T) {
str, rest, ok := utils.ParseCppString(`foo`)
require.Equal(t, false, ok)
str, rest, ok = utils.ParseCppString(`"foo`)
require.Equal(t, false, ok)
str, rest, ok = utils.ParseCppString(`"foo"`)
require.Equal(t, true, ok)
require.Equal(t, `foo`, str)
require.Equal(t, ``, rest)
str, rest, ok = utils.ParseCppString(`"foo\\bar"`)
require.Equal(t, true, ok)
require.Equal(t, `foo\bar`, str)
require.Equal(t, ``, rest)
str, rest, ok = utils.ParseCppString(`"foo \"is\" quoted and \\\\bar\"\" escaped\\" and "then" some`)
require.Equal(t, true, ok)
require.Equal(t, `foo "is" quoted and \\bar"" escaped\`, str)
require.Equal(t, ` and "then" some`, rest)
str, rest, ok = utils.ParseCppString(`" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_abcdefghijklmnopqrstuvwxyz{|}~"`)
require.Equal(t, true, ok)
require.Equal(t, ` !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~`, str)
require.Equal(t, ``, rest)
str, rest, ok = utils.ParseCppString(`"/home/ççç/"`)
require.Equal(t, true, ok)
require.Equal(t, `/home/ççç/`, str)
require.Equal(t, ``, rest)
str, rest, ok = utils.ParseCppString(`"/home/ççç/ /$sdsdd\\"`)
require.Equal(t, true, ok)
require.Equal(t, `/home/ççç/ /$sdsdd\`, str)
require.Equal(t, ``, rest)
}