func Example_completeGeneratedProgram() { // main
fset := token.NewFileSet()
file := fset.AddFile("example.go", -1, len(src))
src := bytes.NewBufferString(src)
lx, err := lex.New(file, src, lex.RuneClass(rune2Class))
if err != nil {
panic(err)
}
l := &lexer{lx}
for {
c := l.scan()
fmt.Printf("%v: %v %q\n", file.Position(c.Pos()), str(c.Rune), l.TokenBytes(nil))
if c.Rune == lex.RuneEOF {
return
}
}
// Output:
// example.go:3:1: FUNC "func"
// example.go:3:6: IDENT "Xφ42"
// example.go:3:11: '(' "("
// example.go:3:12: ')' ")"
// example.go:3:14: IDENT "int"
// example.go:3:18: '{' "{"
// example.go:3:20: IDENT "return"
// example.go:3:27: INT "314"
// example.go:3:31: '}' "}"
// example.go:4:2: EOF "\xff"
}
func newLexer(nm string, sz int, r io.RuneReader, report *xc.Report) (*lexer, error) {
file := xc.FileSet.AddFile(nm, -1, sz+2)
lx, err := lex.New(
file,
r,
lex.ErrorFunc(func(pos token.Pos, msg string) {
report.Err(pos, msg)
}),
lex.RuneClass(func(r rune) int { return int(r) }),
)
if err != nil {
return nil, err
}
l := &lexer{
Lexer: lx,
report: report,
}
l.emit(&Call{Target: 2})
l.emit(&Halt{})
l.enter = &Enter{NVars: -1}
l.jmp = &Jmp{Target: -1}
l.emit(l.enter)
l.emit(l.jmp)
return l, nil
}
func newLexer(file *token.File, src io.RuneReader) (_ *lexer, err error) {
l := &lexer{}
if l.Lexer, err = lex.New(
file,
src,
lex.ErrorFunc(func(pos token.Pos, msg string) {
l.errors.Add(l.File.Position(pos), msg)
}),
lex.RuneClass(runeClass),
); err != nil {
return nil, err
}
return l, nil
}