forked from astaxie/docker-registry
/
main.go
127 lines (105 loc) · 2.78 KB
/
main.go
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// Package highlight_go provides a syntax highlighter for Go, using go/scanner.
package highlight_go
import (
"go/scanner"
"go/token"
"io"
"github.com/sourcegraph/annotate"
"github.com/sourcegraph/syntaxhighlight"
)
// TokenKind returns a syntaxhighlight token kind value for the given tok and lit.
func TokenKind(tok token.Token, lit string) syntaxhighlight.Kind {
switch {
case tok.IsKeyword() || (tok.IsOperator() && tok <= token.ELLIPSIS):
return syntaxhighlight.Keyword
// Literals.
case tok == token.INT || tok == token.FLOAT || tok == token.IMAG || tok == token.CHAR:
return syntaxhighlight.Decimal
case tok == token.STRING:
return syntaxhighlight.String
case lit == "true" || lit == "false" || lit == "iota" || lit == "nil":
return syntaxhighlight.Literal
case tok == token.COMMENT:
return syntaxhighlight.Comment
default:
return syntaxhighlight.Plaintext
}
}
func Print(src []byte, w io.Writer, p syntaxhighlight.Printer) error {
var s scanner.Scanner
fset := token.NewFileSet()
file := fset.AddFile("", fset.Base(), len(src))
s.Init(file, src, nil, scanner.ScanComments)
var lastOffset int
for {
pos, tok, lit := s.Scan()
if tok == token.EOF {
break
}
var tokString string
if lit != "" {
tokString = lit
} else {
tokString = tok.String()
}
// TODO: Clean this up.
//if tok == token.SEMICOLON {
if tok == token.SEMICOLON && lit == "\n" {
continue
}
// Whitespace between previous and current tokens.
offset := int(fset.Position(pos).Offset)
if whitespace := string(src[lastOffset:offset]); whitespace != "" {
err := p.Print(w, syntaxhighlight.Whitespace, whitespace)
if err != nil {
return err
}
}
lastOffset = offset + len(tokString)
err := p.Print(w, TokenKind(tok, lit), tokString)
if err != nil {
return err
}
}
// Print final whitespace after the last token.
if whitespace := string(src[lastOffset:]); whitespace != "" {
err := p.Print(w, syntaxhighlight.Whitespace, whitespace)
if err != nil {
return err
}
}
return nil
}
func Annotate(src []byte, a syntaxhighlight.Annotator) (annotate.Annotations, error) {
var s scanner.Scanner
fset := token.NewFileSet()
file := fset.AddFile("", fset.Base(), len(src))
s.Init(file, src, nil, scanner.ScanComments)
var anns annotate.Annotations
for {
pos, tok, lit := s.Scan()
if tok == token.EOF {
break
}
offset := int(fset.Position(pos).Offset)
var tokString string
if lit != "" {
tokString = lit
} else {
tokString = tok.String()
}
// TODO: Clean this up.
//if tok == token.SEMICOLON {
if tok == token.SEMICOLON && lit == "\n" {
continue
}
ann, err := a.Annotate(offset, TokenKind(tok, lit), tokString)
if err != nil {
return nil, err
}
if ann != nil {
anns = append(anns, ann)
}
}
return anns, nil
}