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https://github.com/golang/go
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fmt.Scan:
- reimplement integer scanning to handle renamed basic integer types - start implementation of Fscanf and Scanf; not yet ready for general use. This intermediate CL is a useful checkpoint. A similar change needs to be done for float and complex, but it seemed worth getting the approach reviewed before making those changes. R=rsc CC=golang-dev https://golang.org/cl/1418041
This commit is contained in:
Rob Pike
parent
901976cfc3
commit
e6600ea17d
@ -41,6 +41,67 @@ type Scanner interface {
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Scan(ScanState) os.Error
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}
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// Scan parses text read from standard input, storing successive
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// space-separated values into successive arguments. Newlines count as
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// space. Each argument must be a pointer to a basic type or an
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// implementation of the Scanner interface. It returns the number of items
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// successfully parsed. If that is less than the number of arguments, err
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// will report why.
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func Scan(a ...interface{}) (n int, err os.Error) {
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return Fscan(os.Stdin, a)
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}
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// Fscanln parses text read from standard input, storing successive
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// space-separated values into successive arguments. Scanning stops at a
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// newline and after the final item there must be a newline or EOF. Each
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// argument must be a pointer to a basic type or an implementation of the
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// Scanner interface. It returns the number of items successfully parsed.
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// If that is less than the number of arguments, err will report why.
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func Scanln(a ...interface{}) (n int, err os.Error) {
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return Fscanln(os.Stdin, a)
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}
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// Fscan parses text read from r, storing successive space-separated values
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// into successive arguments. Newlines count as space. Each argument must
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// be a pointer to a basic type or an implementation of the Scanner
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// interface. It returns the number of items successfully parsed. If that
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// is less than the number of arguments, err will report why.
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func Fscan(r io.Reader, a ...interface{}) (n int, err os.Error) {
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s := newScanState(r, true)
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n = s.doScan(a)
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err = s.err
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s.free()
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return
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}
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// Fscanln parses text read from r, storing successive space-separated values
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// into successive arguments. Scanning stops at a newline and after the
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// final item there must be a newline or EOF. Each argument must be a
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// pointer to a basic type or an implementation of the Scanner interface. It
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// returns the number of items successfully parsed. If that is less than the
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// number of arguments, err will report why.
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func Fscanln(r io.Reader, a ...interface{}) (n int, err os.Error) {
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s := newScanState(r, false)
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n = s.doScan(a)
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err = s.err
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s.free()
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return
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}
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// XXXScanf is incomplete, do not use.
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func XXXScanf(format string, a ...interface{}) (n int, err os.Error) {
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return XXXFscanf(os.Stdin, format, a)
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}
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// XXXFscanf is incomplete, do not use.
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func XXXFscanf(r io.Reader, format string, a ...interface{}) (n int, err os.Error) {
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s := newScanState(r, false)
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n = s.doScanf(format, a)
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err = s.err
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s.free()
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return
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}
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// ss is the internal implementation of ScanState.
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type ss struct {
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rr readRuner // where to read input
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@ -181,51 +242,9 @@ func (s *ss) token() string {
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return s.buf.String()
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}
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// Scan parses text read from standard input, storing successive
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// space-separated values into successive arguments. Newlines count as
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// space. Each argument must be a pointer to a basic type or an
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// implementation of the Scanner interface. It returns the number of items
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// successfully parsed. If that is less than the number of arguments, err
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// will report why.
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func Scan(a ...interface{}) (n int, err os.Error) {
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return Fscan(os.Stdin, a)
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}
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// Fscanln parses text read from standard input, storing successive
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// space-separated values into successive arguments. Scanning stops at a
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// newline and after the final item there must be a newline or EOF. Each
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// argument must be a pointer to a basic type or an implementation of the
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// Scanner interface. It returns the number of items successfully parsed.
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// If that is less than the number of arguments, err will report why.
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func Scanln(a ...interface{}) (n int, err os.Error) {
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return Fscanln(os.Stdin, a)
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}
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// Fscan parses text read from r, storing successive space-separated values
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// into successive arguments. Newlines count as space. Each argument must
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// be a pointer to a basic type or an implementation of the Scanner
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// interface. It returns the number of items successfully parsed. If that
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// is less than the number of arguments, err will report why.
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func Fscan(r io.Reader, a ...interface{}) (n int, err os.Error) {
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s := newScanState(r, true)
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n = s.doScan(a)
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err = s.err
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s.free()
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return
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}
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// Fscanln parses text read from r, storing successive space-separated values
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// into successive arguments. Scanning stops at a newline and after the
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// final item there must be a newline or EOF. Each argument must be a
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// pointer to a basic type or an implementation of the Scanner interface. It
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// returns the number of items successfully parsed. If that is less than the
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// number of arguments, err will report why.
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func Fscanln(r io.Reader, a ...interface{}) (n int, err os.Error) {
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s := newScanState(r, false)
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n = s.doScan(a)
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err = s.err
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s.free()
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return
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// typeError sets the error string to an indication that the type of the operand did not match the format
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func (s *ss) typeError(field interface{}, expected string) {
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s.err = os.ErrorString("expected field of type pointer to " + expected + "; found " + reflect.Typeof(field).String())
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}
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var intBits = uint(reflect.Typeof(int(0)).Size() * 8)
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@ -242,6 +261,101 @@ func (s *ss) scanBool(tok string) bool {
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return b
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}
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// convertInt returns the value of the integer
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// stored in the token, checking for overflow. Any error is stored in s.err.
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func (s *ss) convertInt(tok string, bitSize uint, base int) (i int64) {
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i, s.err = strconv.Btoi64(tok, base)
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x := (i << (64 - bitSize)) >> (64 - bitSize)
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if x != i {
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s.err = os.ErrorString("integer overflow on token " + tok)
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}
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return i
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}
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// convertUint returns the value of the unsigned integer
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// stored in the token, checking for overflow. Any error is stored in s.err.
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func (s *ss) convertUint(tok string, bitSize uint, base int) (i uint64) {
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i, s.err = strconv.Btoui64(tok, base)
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x := (i << (64 - bitSize)) >> (64 - bitSize)
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if x != i {
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s.err = os.ErrorString("unsigned integer overflow on token " + tok)
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}
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return i
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}
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// scanInteger converts the token to an integer in the appropriate base
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// and stores the result according to the type of the field.
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func (s *ss) scanInteger(tok string, field interface{}, base int) {
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switch v := field.(type) {
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case *int:
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*v = int(s.convertInt(tok, intBits, base))
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return
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case *int8:
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*v = int8(s.convertInt(tok, 8, base))
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return
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case *int16:
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*v = int16(s.convertInt(tok, 16, base))
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return
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case *int32:
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*v = int32(s.convertInt(tok, 32, base))
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return
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case *int64:
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*v = s.convertInt(tok, 64, base)
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return
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case *uint:
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*v = uint(s.convertUint(tok, intBits, base))
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return
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case *uint8:
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*v = uint8(s.convertUint(tok, 8, base))
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return
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case *uint16:
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*v = uint16(s.convertUint(tok, 16, base))
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return
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case *uint32:
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*v = uint32(s.convertUint(tok, 32, base))
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return
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case *uint64:
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*v = uint64(s.convertUint(tok, 64, base))
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return
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case *uintptr:
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*v = uintptr(s.convertUint(tok, uintptrBits, base))
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return
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}
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// Not a basic type; probably a renamed type. We need to use reflection.
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v := reflect.NewValue(field)
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ptr, ok := v.(*reflect.PtrValue)
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if !ok {
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s.typeError(field, "integer")
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return
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}
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switch v := ptr.Elem().(type) {
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case *reflect.IntValue:
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v.Set(int(s.convertInt(tok, intBits, base)))
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case *reflect.Int8Value:
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v.Set(int8(s.convertInt(tok, 8, base)))
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case *reflect.Int16Value:
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v.Set(int16(s.convertInt(tok, 16, base)))
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case *reflect.Int32Value:
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v.Set(int32(s.convertInt(tok, 32, base)))
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case *reflect.Int64Value:
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v.Set(s.convertInt(tok, 64, base))
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case *reflect.UintValue:
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v.Set(uint(s.convertUint(tok, intBits, base)))
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case *reflect.Uint8Value:
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v.Set(uint8(s.convertUint(tok, 8, base)))
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case *reflect.Uint16Value:
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v.Set(uint16(s.convertUint(tok, 16, base)))
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case *reflect.Uint32Value:
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v.Set(uint32(s.convertUint(tok, 32, base)))
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case *reflect.Uint64Value:
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v.Set(s.convertUint(tok, 64, base))
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case *reflect.UintptrValue:
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v.Set(uintptr(s.convertUint(tok, uintptrBits, base)))
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default:
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s.err = os.ErrorString("internal error: unknown int type")
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}
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}
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// complexParts returns the strings representing the real and imaginary parts of the string.
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func (s *ss) complexParts(str string) (real, imag string) {
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if len(str) > 2 && str[0] == '(' && str[len(str)-1] == ')' {
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@ -341,49 +455,13 @@ func (s *ss) scanComplex(tok string, atof func(*ss, string) float64) complex128
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return cmplx(real, imag)
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}
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// scanInt converts the token to an int64, but checks that it fits into the
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// specified number of bits.
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func (s *ss) scanInt(tok string, bitSize uint) int64 {
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if s.err != nil {
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return 0
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}
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var i int64
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i, s.err = strconv.Atoi64(tok)
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x := (i << (64 - bitSize)) >> (64 - bitSize)
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if i != x {
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s.err = os.ErrorString("integer overflow on token " + tok)
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}
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return i
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}
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// scanUint converts the token to a uint64, but checks that it fits into the
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// specified number of bits.
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func (s *ss) scanUint(tok string, bitSize uint) uint64 {
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if s.err != nil {
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return 0
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}
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var i uint64
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i, s.err = strconv.Atoui64(tok)
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x := (i << (64 - bitSize)) >> (64 - bitSize)
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if i != x {
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s.err = os.ErrorString("unsigned integer overflow on token " + tok)
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}
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return i
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}
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// doScan does the real work. At the moment, it handles only pointers to basic types.
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func (s *ss) doScan(a []interface{}) int {
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for n, param := range a {
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// If the parameter has its own Scan method, use that.
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if v, ok := param.(Scanner); ok {
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s.err = v.Scan(s)
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if s.err != nil {
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return n
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}
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continue
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}
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// scanOne scans a single value, deriving the scanner from the type of the argument.
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func (s *ss) scanOne(field interface{}) {
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tok := s.token()
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switch v := param.(type) {
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if s.err != nil {
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return
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}
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switch v := field.(type) {
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case *bool:
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*v = s.scanBool(tok)
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case *complex:
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@ -393,27 +471,27 @@ func (s *ss) doScan(a []interface{}) int {
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case *complex128:
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*v = s.scanComplex(tok, (*ss).scanFloat64)
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case *int:
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*v = int(s.scanInt(tok, intBits))
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*v = int(s.convertInt(tok, intBits, 10))
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case *int8:
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*v = int8(s.scanInt(tok, 8))
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*v = int8(s.convertInt(tok, 8, 10))
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case *int16:
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*v = int16(s.scanInt(tok, 16))
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*v = int16(s.convertInt(tok, 16, 10))
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case *int32:
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*v = int32(s.scanInt(tok, 32))
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*v = int32(s.convertInt(tok, 32, 10))
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case *int64:
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*v = s.scanInt(tok, 64)
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*v = s.convertInt(tok, intBits, 10)
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case *uint:
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*v = uint(s.scanUint(tok, intBits))
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*v = uint(s.convertUint(tok, intBits, 10))
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case *uint8:
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*v = uint8(s.scanUint(tok, 8))
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*v = uint8(s.convertUint(tok, 8, 10))
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case *uint16:
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*v = uint16(s.scanUint(tok, 16))
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*v = uint16(s.convertUint(tok, 16, 10))
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case *uint32:
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*v = uint32(s.scanUint(tok, 32))
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*v = uint32(s.convertUint(tok, 32, 10))
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case *uint64:
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*v = s.scanUint(tok, 64)
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*v = s.convertUint(tok, 64, 10)
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case *uintptr:
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*v = uintptr(s.scanUint(tok, uintptrBits))
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*v = uintptr(s.convertUint(tok, uintptrBits, 10))
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case *float:
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if s.err == nil {
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*v, s.err = strconv.Atof(tok)
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@ -437,14 +515,37 @@ func (s *ss) doScan(a []interface{}) int {
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default:
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t := reflect.Typeof(v)
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str := t.String()
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if _, ok := t.(*reflect.PtrType); !ok {
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ptr, ok := t.(*reflect.PtrType)
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if !ok {
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s.err = os.ErrorString("Scan: type not a pointer: " + str)
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} else {
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s.err = os.ErrorString("Scan: can't handle type: " + str)
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return
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}
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switch ptr.Elem().(type) {
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case *reflect.IntType, *reflect.Int8Type, *reflect.Int16Type, *reflect.Int32Type, *reflect.Int64Type:
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s.scanInteger(tok, v, 10)
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case *reflect.UintType, *reflect.Uint8Type, *reflect.Uint16Type, *reflect.Uint32Type, *reflect.Uint64Type, *reflect.UintptrType:
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s.scanInteger(tok, v, 10)
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default:
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s.err = os.ErrorString("Scan: can't handle type: " + t.String())
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}
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}
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}
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// doScan does the real work for scanning without a format string.
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// At the moment, it handles only pointers to basic types.
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func (s *ss) doScan(a []interface{}) int {
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for fieldnum, field := range a {
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// If the parameter has its own Scan method, use that.
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if v, ok := field.(Scanner); ok {
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s.err = v.Scan(s)
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if s.err != nil {
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return n
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return fieldnum
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}
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continue
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}
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s.scanOne(field)
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if s.err != nil {
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return fieldnum
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}
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}
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// Check for newline if required.
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@ -469,3 +570,70 @@ func (s *ss) doScan(a []interface{}) int {
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}
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return len(a)
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}
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// doScanf does the real work when scanning with a format string.
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// At the moment, it handles only pointers to basic types.
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func (s *ss) doScanf(format string, a []interface{}) int {
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end := len(format) - 1
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fieldnum := 0 // we process one item per non-trivial format
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for i := 0; i <= end; {
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c, w := utf8.DecodeRuneInString(format[i:])
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if c != '%' || i == end {
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// TODO: WHAT NOW?
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i += w
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continue
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}
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i++
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// TODO: FLAGS
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c, w = utf8.DecodeRuneInString(format[i:])
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i += w
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// percent is special - absorbs no operand
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if c == '%' {
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// TODO: WHAT NOW?
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continue
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}
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if fieldnum >= len(a) { // out of operands
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s.err = os.ErrorString("too few operands for format %" + format[i-w:])
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return fieldnum
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}
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field := a[fieldnum]
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fieldnum++
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// If the parameter has its own Scan method, use that.
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if v, ok := field.(Scanner); ok {
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s.err = v.Scan(s)
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if s.err != nil {
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return fieldnum - 1
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}
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continue
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}
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if c == 'v' {
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// Default format works; just call doScan, but note that it will scan for the token
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s.scanOne(field)
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} else {
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tok := s.token()
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switch c {
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case 't':
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if v, ok := field.(*bool); ok {
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*v = s.scanBool(tok)
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} else {
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s.typeError(field, "boolean")
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}
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case 'b':
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s.scanInteger(tok, field, 2)
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case 'o':
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s.scanInteger(tok, field, 8)
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case 'd':
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s.scanInteger(tok, field, 10)
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case 'x', 'X':
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s.scanInteger(tok, field, 16)
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default:
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s.err = os.ErrorString("unknown scanning verb %" + format[i-w:])
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}
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if s.err != nil {
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return fieldnum - 1
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}
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}
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}
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return fieldnum
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}
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@ -19,24 +19,58 @@ type ScanTest struct {
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out interface{}
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}
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var boolVal bool
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var intVal int
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var int8Val int8
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||||
var int16Val int16
|
||||
var int32Val int32
|
||||
var int64Val int64
|
||||
var uintVal uint
|
||||
var uint8Val uint8
|
||||
var uint16Val uint16
|
||||
var uint32Val uint32
|
||||
var uint64Val uint64
|
||||
var floatVal float
|
||||
var float32Val float32
|
||||
var float64Val float64
|
||||
var stringVal string
|
||||
var complexVal complex
|
||||
var complex64Val complex64
|
||||
var complex128Val complex128
|
||||
type ScanfTest struct {
|
||||
format string
|
||||
text string
|
||||
in interface{}
|
||||
out interface{}
|
||||
}
|
||||
|
||||
type (
|
||||
renamedInt int
|
||||
renamedInt8 int8
|
||||
renamedInt16 int16
|
||||
renamedInt32 int32
|
||||
renamedInt64 int64
|
||||
renamedUint uint
|
||||
renamedUint8 uint8
|
||||
renamedUint16 uint16
|
||||
renamedUint32 uint32
|
||||
renamedUint64 uint64
|
||||
renamedUintptr uintptr
|
||||
)
|
||||
|
||||
var (
|
||||
boolVal bool
|
||||
intVal int
|
||||
int8Val int8
|
||||
int16Val int16
|
||||
int32Val int32
|
||||
int64Val int64
|
||||
uintVal uint
|
||||
uint8Val uint8
|
||||
uint16Val uint16
|
||||
uint32Val uint32
|
||||
uint64Val uint64
|
||||
floatVal float
|
||||
float32Val float32
|
||||
float64Val float64
|
||||
stringVal string
|
||||
complexVal complex
|
||||
complex64Val complex64
|
||||
complex128Val complex128
|
||||
renamedIntVal renamedInt
|
||||
renamedInt8Val renamedInt8
|
||||
renamedInt16Val renamedInt16
|
||||
renamedInt32Val renamedInt32
|
||||
renamedInt64Val renamedInt64
|
||||
renamedUintVal renamedUint
|
||||
renamedUint8Val renamedUint8
|
||||
renamedUint16Val renamedUint16
|
||||
renamedUint32Val renamedUint32
|
||||
renamedUint64Val renamedUint64
|
||||
renamedUintptrVal renamedUintptr
|
||||
)
|
||||
|
||||
// Xs accepts any non-empty run of x's.
|
||||
var xPat = testing.MustCompile("x+")
|
||||
@ -92,10 +126,66 @@ var scanTests = []ScanTest{
|
||||
ScanTest{"-3.45e1-3i\n", &complex64Val, complex64(-3.45e1 - 3i)},
|
||||
ScanTest{"-.45e1-1e2i\n", &complex128Val, complex128(-.45e1 - 100i)},
|
||||
|
||||
// Renamed types
|
||||
ScanTest{"101\n", &renamedIntVal, renamedInt(101)},
|
||||
ScanTest{"102\n", &renamedIntVal, renamedInt(102)},
|
||||
ScanTest{"103\n", &renamedUintVal, renamedUint(103)},
|
||||
ScanTest{"104\n", &renamedUintVal, renamedUint(104)},
|
||||
ScanTest{"105\n", &renamedInt8Val, renamedInt8(105)},
|
||||
ScanTest{"106\n", &renamedInt16Val, renamedInt16(106)},
|
||||
ScanTest{"107\n", &renamedInt32Val, renamedInt32(107)},
|
||||
ScanTest{"108\n", &renamedInt64Val, renamedInt64(108)},
|
||||
ScanTest{"109\n", &renamedUint8Val, renamedUint8(109)},
|
||||
ScanTest{"110\n", &renamedUint16Val, renamedUint16(110)},
|
||||
ScanTest{"111\n", &renamedUint32Val, renamedUint32(111)},
|
||||
ScanTest{"112\n", &renamedUint64Val, renamedUint64(112)},
|
||||
ScanTest{"113\n", &renamedUintptrVal, renamedUintptr(113)},
|
||||
|
||||
// Custom scanner.
|
||||
ScanTest{" xxx ", &xVal, Xs("xxx")},
|
||||
}
|
||||
|
||||
var scanfTests = []ScanfTest{
|
||||
ScanfTest{"%v", "FALSE\n", &boolVal, false},
|
||||
ScanfTest{"%t", "true\n", &boolVal, true},
|
||||
ScanfTest{"%v", "-71\n", &intVal, -71},
|
||||
ScanfTest{"%d", "72\n", &intVal, 72},
|
||||
ScanfTest{"%d", "73\n", &int8Val, int8(73)},
|
||||
ScanfTest{"%d", "-74\n", &int16Val, int16(-74)},
|
||||
ScanfTest{"%d", "75\n", &int32Val, int32(75)},
|
||||
ScanfTest{"%d", "76\n", &int64Val, int64(76)},
|
||||
ScanfTest{"%b", "1001001\n", &intVal, 73},
|
||||
ScanfTest{"%o", "075\n", &intVal, 075},
|
||||
ScanfTest{"%x", "a75\n", &intVal, 0xa75},
|
||||
ScanfTest{"%v", "71\n", &uintVal, uint(71)},
|
||||
ScanfTest{"%d", "72\n", &uintVal, uint(72)},
|
||||
ScanfTest{"%d", "73\n", &uint8Val, uint8(73)},
|
||||
ScanfTest{"%d", "74\n", &uint16Val, uint16(74)},
|
||||
ScanfTest{"%d", "75\n", &uint32Val, uint32(75)},
|
||||
ScanfTest{"%d", "76\n", &uint64Val, uint64(76)},
|
||||
ScanfTest{"%b", "1001001\n", &uintVal, uint(73)},
|
||||
ScanfTest{"%o", "075\n", &uintVal, uint(075)},
|
||||
ScanfTest{"%x", "a75\n", &uintVal, uint(0xa75)},
|
||||
ScanfTest{"%x", "A75\n", &uintVal, uint(0xa75)},
|
||||
|
||||
// Renamed types
|
||||
ScanfTest{"%v", "101\n", &renamedIntVal, renamedInt(101)},
|
||||
ScanfTest{"%d", "102\n", &renamedIntVal, renamedInt(102)},
|
||||
ScanfTest{"%v", "103\n", &renamedUintVal, renamedUint(103)},
|
||||
ScanfTest{"%d", "104\n", &renamedUintVal, renamedUint(104)},
|
||||
ScanfTest{"%d", "105\n", &renamedInt8Val, renamedInt8(105)},
|
||||
ScanfTest{"%d", "106\n", &renamedInt16Val, renamedInt16(106)},
|
||||
ScanfTest{"%d", "107\n", &renamedInt32Val, renamedInt32(107)},
|
||||
ScanfTest{"%d", "108\n", &renamedInt64Val, renamedInt64(108)},
|
||||
ScanfTest{"%d", "109\n", &renamedUint8Val, renamedUint8(109)},
|
||||
ScanfTest{"%d", "110\n", &renamedUint16Val, renamedUint16(110)},
|
||||
ScanfTest{"%d", "111\n", &renamedUint32Val, renamedUint32(111)},
|
||||
ScanfTest{"%d", "112\n", &renamedUint64Val, renamedUint64(112)},
|
||||
ScanfTest{"%d", "113\n", &renamedUintptrVal, renamedUintptr(113)},
|
||||
|
||||
ScanfTest{"%x", "FFFFFFFF\n", &uint32Val, uint32(0xFFFFFFFF)},
|
||||
}
|
||||
|
||||
var overflowTests = []ScanTest{
|
||||
ScanTest{"128", &int8Val, 0},
|
||||
ScanTest{"32768", &int16Val, 0},
|
||||
@ -142,6 +232,30 @@ func TestScanln(t *testing.T) {
|
||||
testScan(t, Fscanln)
|
||||
}
|
||||
|
||||
func TestScanf(t *testing.T) {
|
||||
for _, test := range scanfTests {
|
||||
r := strings.NewReader(test.text)
|
||||
n, err := XXXFscanf(r, test.format, test.in)
|
||||
if err != nil {
|
||||
t.Errorf("got error scanning (%q, %q): %s", test.format, test.text, err)
|
||||
continue
|
||||
}
|
||||
if n != 1 {
|
||||
t.Errorf("count error on entry (%q, %q): got %d", test.format, test.text, n)
|
||||
continue
|
||||
}
|
||||
// The incoming value may be a pointer
|
||||
v := reflect.NewValue(test.in)
|
||||
if p, ok := v.(*reflect.PtrValue); ok {
|
||||
v = p.Elem()
|
||||
}
|
||||
val := v.Interface()
|
||||
if !reflect.DeepEqual(val, test.out) {
|
||||
t.Errorf("scanning (%q, %q): expected %v got %v, type %T", test.format, test.text, test.out, val, val)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestScanOverflow(t *testing.T) {
|
||||
// different machines and different types report errors with different strings.
|
||||
re := testing.MustCompile("overflow|too large|out of range|not representable")
|
||||
|
||||
Loading…
Reference in New Issue
Block a user