*: parsing a spec to a Hierarchy struct
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
parent
16b15e1c29
commit
fe68ca2065
4 changed files with 152 additions and 73 deletions
65
hierarchy.go
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65
hierarchy.go
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@ -0,0 +1,65 @@
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package mtree
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import (
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"fmt"
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"io"
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"sort"
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"strings"
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)
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// DirectoryHierarchy is the mapped structure for an mtree directory hierarchy
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// spec
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type DirectoryHierarchy struct {
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Entries []Entry
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}
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// WriteTo simplifies the output of the resulting hierarchy spec
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func (dh DirectoryHierarchy) WriteTo(w io.Writer) (n int64, err error) {
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sort.Sort(byPos(dh.Entries))
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var sum int64
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for _, e := range dh.Entries {
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i, err := io.WriteString(w, e.String()+"\n")
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if err != nil {
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return sum, err
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}
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sum += int64(i)
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}
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return sum, nil
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}
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type byPos []Entry
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func (bp byPos) Len() int { return len(bp) }
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func (bp byPos) Less(i, j int) bool { return bp[i].Pos < bp[j].Pos }
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func (bp byPos) Swap(i, j int) { bp[i], bp[j] = bp[j], bp[i] }
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// Entry is each component of content in the mtree spec file
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type Entry struct {
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Pos int // order in the spec
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Raw string // file or directory name
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Name string // file or directory name
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Keywords []string // TODO(vbatts) maybe a keyword typed set of values?
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Type EntryType
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}
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func (e Entry) String() string {
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if e.Raw != "" {
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return e.Raw
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}
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// TODO(vbatts) if type is RelativeType and a keyword of not type=dir
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return fmt.Sprintf("%s %s", e.Name, strings.Join(e.Keywords, " "))
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}
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// EntryType are the formats of lines in an mtree spec file
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type EntryType int
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// The types of lines to be found in an mtree spec file
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const (
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SignatureType EntryType = iota // first line of the file, like `#mtree v2.0`
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BlankType // blank lines are ignored
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CommentType // Lines beginning with `#` are ignored
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SpecialType // line that has `/` prefix issue a "special" command (currently only /set and /unset)
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RelativeType // if the first white-space delimited word does not have a '/' in it. Options/keywords are applied.
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DotDotType // .. - A relative path step. keywords/options are ignored
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FullType // if the first word on the line has a `/` after the first character, it interpretted as a file pathname with options
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)
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58
mtree.go
58
mtree.go
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@ -1,58 +0,0 @@
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package mtree
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import "io"
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// Positioner responds with the newline delimited position
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type Positioner interface {
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Pos() int
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}
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// DirectoryHierarchy is the mapped structure for an mtree directory hierarchy
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// spec
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type DirectoryHierarchy struct {
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Comments []Comment
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Entries []Entry
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}
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// WriteTo simplifies the output of the resulting hierarchy spec
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func (dh DirectoryHierarchy) WriteTo(w io.Writer) (n int64, err error) {
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return 0, nil
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}
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// Comment stores arbitrary metadata for the spec. Sometimes "user", "machine",
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// "tree", and "date". But most of the time, it includes the relative path of
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// the directory being stepped into. Or a "signature" like `#mtree v2.0`,
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type Comment struct {
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Position int
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Str string
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// TODO(vbatts) include a comment line parser
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}
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// Pos returns the line of this comment
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func (c Comment) Pos() int {
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return c.Position
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}
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// Entry is each component of content in the mtree spec file
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type Entry struct {
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Position int // order in the spec
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Name string // file or directory name
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Keywords []string // TODO(vbatts) maybe a keyword typed set of values?
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str string // raw string. needed?
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Type EntryType
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}
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// Pos returns the line of this comment
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func (e Entry) Pos() int {
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return e.Position
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}
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type EntryType int
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const (
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SpecialType int = iota // line that has `/` prefix issue a "special" command (currently only /set and /unset)
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FileType // indented line
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DirectoryType // ^ matched line, that is not /set
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PathStepType // .. - keywords/options are ignored
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FullType // if the first word on the line has a `/` after the first character, it interpretted as a file pathname with options
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)
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@ -1,11 +1,8 @@
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package mtree
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import (
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"bufio"
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"fmt"
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"log"
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"os"
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"strings"
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"testing"
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)
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@ -18,24 +15,22 @@ func TestParser(t *testing.T) {
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func() {
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fh, err := os.Open(file)
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if err != nil {
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log.Println(err)
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t.Error(err)
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return
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}
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defer fh.Close()
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s := bufio.NewScanner(fh)
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for s.Scan() {
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str := s.Text()
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switch {
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case strings.HasPrefix(str, "#"):
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continue
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default:
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}
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fmt.Printf("%q\n", str)
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dh, err := ParseSpec(fh)
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if err != nil {
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t.Error(err)
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}
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if err := s.Err(); err != nil {
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log.Println("ERROR:", err)
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fmt.Printf("%q", dh)
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_, err = dh.WriteTo(os.Stdout)
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if err != nil {
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t.Error(err)
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}
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}()
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}
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}
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77
parse.go
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77
parse.go
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@ -0,0 +1,77 @@
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package mtree
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import (
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"bufio"
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"io"
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"strings"
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)
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func ParseSpec(r io.Reader) (*DirectoryHierarchy, error) {
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s := bufio.NewScanner(r)
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i := int(0)
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dh := DirectoryHierarchy{}
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for s.Scan() {
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str := s.Text()
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e := Entry{Pos: i}
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switch {
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case strings.HasPrefix(str, "#"):
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e.Raw = str
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if strings.HasPrefix(str, "#mtree") {
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e.Type = SignatureType
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} else {
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e.Type = CommentType
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// from here, the comment could be "# key: value" metadata
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// or a relative path hint
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}
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case str == "":
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e.Type = BlankType
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// nothing else to do here
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case strings.HasPrefix(str, "/"):
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e.Type = SpecialType
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// collapse any escaped newlines
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for {
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if strings.HasSuffix(str, `\`) {
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str = str[:len(str)-1]
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s.Scan()
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str += s.Text()
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} else {
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break
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}
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}
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// parse the options
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f := strings.Fields(str)
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e.Name = f[0]
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e.Keywords = f[1:]
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case len(strings.Fields(str)) > 0 && strings.Fields(str)[0] == "..":
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e.Type = DotDotType
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e.Raw = str
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// nothing else to do here
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case len(strings.Fields(str)) > 0:
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// collapse any escaped newlines
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for {
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if strings.HasSuffix(str, `\`) {
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str = str[:len(str)-1]
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s.Scan()
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str += s.Text()
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} else {
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break
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}
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}
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// parse the options
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f := strings.Fields(str)
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if strings.Contains(str, "/") {
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e.Type = FullType
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} else {
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e.Type = RelativeType
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}
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e.Name = f[0]
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e.Keywords = f[1:]
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default:
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// TODO(vbatts) log a warning?
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continue
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}
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dh.Entries = append(dh.Entries, e)
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i++
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}
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return &dh, s.Err()
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}
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