81 lines
1.6 KiB
Go
81 lines
1.6 KiB
Go
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package asar // import "layeh.com/asar"
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import (
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"io"
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"strings"
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)
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// Builder helps construct an Entry.
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//
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// A builder keeps track of the root Entry and the active Entry. When entries
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// are added using the Add* methods, they are added as children to the active
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// Entry.
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type Builder struct {
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root, current *Entry
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}
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// Root returns the root Entry.
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func (b *Builder) Root() *Entry {
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return b.root
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}
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func (b *Builder) init() {
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if b.root == nil {
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b.root = &Entry{
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Flags: FlagDir,
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}
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b.current = b.root
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}
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}
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// Parent sets the active entry to the parent of the active Entry (i.e. moves up
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// a level).
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//
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// The function panics if called on the root Entry.
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func (b *Builder) Parent() *Builder {
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if b.current == b.root {
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panic("root has no parent")
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}
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b.current = b.current.Parent
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return b
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}
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// AddString adds a new file Entry whose contents are the given string.
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func (b *Builder) AddString(name, contents string, flags Flag) *Builder {
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return b.Add(name, strings.NewReader(contents), int64(len(contents)), flags)
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}
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// Add adds a new file Entry.
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func (b *Builder) Add(name string, ra io.ReaderAt, size int64, flags Flag) *Builder {
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b.init()
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child := &Entry{
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Name: name,
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Size: size,
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Flags: flags,
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Parent: b.current,
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r: ra,
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}
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b.current.Children = append(b.current.Children, child)
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return b
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}
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// AddDir adds a new directory Entry. The active Entry is switched to this newly
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// added Entry.
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func (b *Builder) AddDir(name string, flags Flag) *Builder {
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b.init()
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child := &Entry{
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Name: name,
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Flags: flags | FlagDir,
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Parent: b.current,
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}
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b.current.Children = append(b.current.Children, child)
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b.current = child
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return b
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}
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