89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
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// Copyright 2016 Marapongo, Inc. All rights reserved.
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package diag
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import (
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"bytes"
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"fmt"
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"os"
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"strconv"
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)
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// Sink facilitates pluggable diagnostics messages.
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type Sink interface {
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// Count fetches the total number of diagnostics issued (errors plus warnings).
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Count() int
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// Errors fetches the number of errors issued.
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Errors() int
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// Warnings fetches the number of warnings issued.
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Warnings() int
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// Error issues a new error diagnostic.
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Errorf(diag *Diag, args ...interface{})
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// Warning issues a new warning diagnostic.
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Warningf(diag *Diag, args ...interface{})
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}
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// DefaultDiags returns a default sink that simply logs output to stderr/stdout.
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func DefaultSink() Sink {
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return &defaultDiags{}
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}
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// defaultDiags is the default sink which logs output to stderr/stdout.
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type defaultDiags struct {
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errors int
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warnings int
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}
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func (d *defaultDiags) Count() int {
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return d.errors + d.warnings
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}
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func (d *defaultDiags) Errors() int {
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return d.errors
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}
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func (d *defaultDiags) Warnings() int {
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return d.warnings
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}
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func (d *defaultDiags) Errorf(diag *Diag, args ...interface{}) {
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fmt.Fprintln(os.Stdout, d.stringify(diag, "error", args...))
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}
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func (d *defaultDiags) Warningf(diag *Diag, args ...interface{}) {
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fmt.Fprintln(os.Stdout, d.stringify(diag, "warning", args...))
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}
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// stringify stringifies a diagnostic in the usual way (e.g., "error: MU123: Mu.yaml:7:39: error goes here\n").
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func (d *defaultDiags) stringify(diag *Diag, prefix string, args ...interface{}) string {
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var buffer bytes.Buffer
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buffer.WriteString(prefix)
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buffer.WriteString(": ")
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if diag.ID > 0 {
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buffer.WriteString("MU")
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buffer.WriteString(strconv.Itoa(int(diag.ID)))
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buffer.WriteString(": ")
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}
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if diag.File != "" {
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buffer.WriteString(diag.File)
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if diag.Filepos != nil {
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buffer.WriteRune(':')
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buffer.WriteString(strconv.Itoa(diag.Filepos.Start.Row))
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buffer.WriteRune(':')
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buffer.WriteString(strconv.Itoa(diag.Filepos.Start.Col))
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}
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buffer.WriteString(": ")
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}
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buffer.WriteString(fmt.Sprintf(diag.Message, args...))
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buffer.WriteRune('\n')
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// TODO: support Clang-style caret diagnostics; e.g., see http://clang.llvm.org/diagnostics.html.
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return buffer.String()
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}
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