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package dot
import (
"fmt"
"io"
)
// IndentWriter decorates an io.Writer to insert leading TAB \t character per line
type IndentWriter struct {
level int
writer io.Writer
}
// NewIndentWriter returns a new IndentWriter with indent level 0.
func NewIndentWriter(w io.Writer) *IndentWriter {
return &IndentWriter{level: 0, writer: w}
}
// Indent raises the level and writes the extra \t (TAB) character.
func (i *IndentWriter) Indent() {
i.level++
fmt.Fprint(i.writer, "\t")
}
// BackIndent drops the level with one.
func (i *IndentWriter) BackIndent() {
i.level--
}
// IndentWhile call the blocks after an indent and will restore that indent afterward.
func (i *IndentWriter) IndentWhile(block func()) {
i.Indent()
block()
i.BackIndent()
}
// NewLineIndentWhile is a variation of IndentWhile that produces extra newlines.
func (i *IndentWriter) NewLineIndentWhile(block func()) {
i.NewLine()
i.Indent()
block()
i.BackIndent()
i.NewLine()
}
// NewLine writes the new line and a number of tab \t characters that matches the level count.
func (i *IndentWriter) NewLine() {
fmt.Fprint(i.writer, "\n")
for j := 0; j < i.level; j++ {
fmt.Fprint(i.writer, "\t")
}
}
// Write makes it an io.Writer
func (i *IndentWriter) Write(data []byte) (n int, err error) {
return i.writer.Write(data)
}
// WriteString is a convenient Write.
func (i *IndentWriter) WriteString(s string) (n int, err error) {
fmt.Fprint(i.writer, s)
return len(s), nil
}
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