99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package printer
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import (
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"bytes"
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"fmt"
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"io"
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"text/tabwriter"
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"github.com/fatih/hcl/ast"
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)
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type printer struct {
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cfg Config
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node ast.Node
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}
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func (p *printer) output() []byte {
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var buf bytes.Buffer
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fmt.Println("STARTING OUTPUT")
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ast.Walk(p.node, func(n ast.Node) bool {
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fmt.Printf("n = %+v\n", n)
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return true
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})
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return buf.Bytes()
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}
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// A Mode value is a set of flags (or 0). They control printing.
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type Mode uint
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const (
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RawFormat Mode = 1 << iota // do not use a tabwriter; if set, UseSpaces is ignored
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TabIndent // use tabs for indentation independent of UseSpaces
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UseSpaces // use spaces instead of tabs for alignment
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)
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// A Config node controls the output of Fprint.
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type Config struct {
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Mode Mode // default: 0
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Tabwidth int // default: 8
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Indent int // default: 0 (all code is indented at least by this much)
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}
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func (c *Config) fprint(output io.Writer, node ast.Node) error {
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p := &printer{
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cfg: *c,
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node: node,
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}
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// TODO(arslan): implement this
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// redirect output through a trimmer to eliminate trailing whitespace
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// (Input to a tabwriter must be untrimmed since trailing tabs provide
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// formatting information. The tabwriter could provide trimming
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// functionality but no tabwriter is used when RawFormat is set.)
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// output = &trimmer{output: output}
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// redirect output through a tabwriter if necessary
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if c.Mode&RawFormat == 0 {
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minwidth := c.Tabwidth
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padchar := byte('\t')
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if c.Mode&UseSpaces != 0 {
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padchar = ' '
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}
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twmode := tabwriter.DiscardEmptyColumns
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if c.Mode&TabIndent != 0 {
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minwidth = 0
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twmode |= tabwriter.TabIndent
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}
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output = tabwriter.NewWriter(output, minwidth, c.Tabwidth, 1, padchar, twmode)
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}
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// write printer result via tabwriter/trimmer to output
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if _, err := output.Write(p.output()); err != nil {
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return err
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}
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// flush tabwriter, if any
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var err error
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if tw, _ := output.(*tabwriter.Writer); tw != nil {
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err = tw.Flush()
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}
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return err
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}
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func (c *Config) Fprint(output io.Writer, node ast.Node) error {
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return c.fprint(output, node)
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}
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// Fprint "pretty-prints" an HCL node to output
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// It calls Config.Fprint with default settings.
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func Fprint(output io.Writer, node ast.Node) error {
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return (&Config{Tabwidth: 8}).Fprint(output, node)
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}
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