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-rw-r--r--src/fmt/scan_test.go992
1 files changed, 992 insertions, 0 deletions
diff --git a/src/fmt/scan_test.go b/src/fmt/scan_test.go
new file mode 100644
index 000000000..541e12df2
--- /dev/null
+++ b/src/fmt/scan_test.go
@@ -0,0 +1,992 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fmt_test
+
+import (
+ "bufio"
+ "bytes"
+ "errors"
+ . "fmt"
+ "io"
+ "math"
+ "reflect"
+ "regexp"
+ "strings"
+ "testing"
+ "unicode/utf8"
+)
+
+type ScanTest struct {
+ text string
+ in interface{}
+ out interface{}
+}
+
+type ScanfTest struct {
+ format string
+ text string
+ in interface{}
+ out interface{}
+}
+
+type ScanfMultiTest struct {
+ format string
+ text string
+ in []interface{}
+ out []interface{}
+ err string
+}
+
+var (
+ boolVal bool
+ intVal int
+ int8Val int8
+ int16Val int16
+ int32Val int32
+ int64Val int64
+ uintVal uint
+ uint8Val uint8
+ uint16Val uint16
+ uint32Val uint32
+ uint64Val uint64
+ float32Val float32
+ float64Val float64
+ stringVal string
+ bytesVal []byte
+ runeVal rune
+ complex64Val complex64
+ complex128Val complex128
+ renamedBoolVal renamedBool
+ renamedIntVal renamedInt
+ renamedInt8Val renamedInt8
+ renamedInt16Val renamedInt16
+ renamedInt32Val renamedInt32
+ renamedInt64Val renamedInt64
+ renamedUintVal renamedUint
+ renamedUint8Val renamedUint8
+ renamedUint16Val renamedUint16
+ renamedUint32Val renamedUint32
+ renamedUint64Val renamedUint64
+ renamedUintptrVal renamedUintptr
+ renamedStringVal renamedString
+ renamedBytesVal renamedBytes
+ renamedFloat32Val renamedFloat32
+ renamedFloat64Val renamedFloat64
+ renamedComplex64Val renamedComplex64
+ renamedComplex128Val renamedComplex128
+)
+
+type FloatTest struct {
+ text string
+ in float64
+ out float64
+}
+
+// Xs accepts any non-empty run of the verb character
+type Xs string
+
+func (x *Xs) Scan(state ScanState, verb rune) error {
+ tok, err := state.Token(true, func(r rune) bool { return r == verb })
+ if err != nil {
+ return err
+ }
+ s := string(tok)
+ if !regexp.MustCompile("^" + string(verb) + "+$").MatchString(s) {
+ return errors.New("syntax error for xs")
+ }
+ *x = Xs(s)
+ return nil
+}
+
+var xVal Xs
+
+// IntString accepts an integer followed immediately by a string.
+// It tests the embedding of a scan within a scan.
+type IntString struct {
+ i int
+ s string
+}
+
+func (s *IntString) Scan(state ScanState, verb rune) error {
+ if _, err := Fscan(state, &s.i); err != nil {
+ return err
+ }
+
+ tok, err := state.Token(true, nil)
+ if err != nil {
+ return err
+ }
+ s.s = string(tok)
+ return nil
+}
+
+var intStringVal IntString
+
+// myStringReader implements Read but not ReadRune, allowing us to test our readRune wrapper
+// type that creates something that can read runes given only Read().
+type myStringReader struct {
+ r *strings.Reader
+}
+
+func (s *myStringReader) Read(p []byte) (n int, err error) {
+ return s.r.Read(p)
+}
+
+func newReader(s string) *myStringReader {
+ return &myStringReader{strings.NewReader(s)}
+}
+
+var scanTests = []ScanTest{
+ // Basic types
+ {"T\n", &boolVal, true}, // boolean test vals toggle to be sure they are written
+ {"F\n", &boolVal, false}, // restored to zero value
+ {"21\n", &intVal, 21},
+ {"0\n", &intVal, 0},
+ {"000\n", &intVal, 0},
+ {"0x10\n", &intVal, 0x10},
+ {"-0x10\n", &intVal, -0x10},
+ {"0377\n", &intVal, 0377},
+ {"-0377\n", &intVal, -0377},
+ {"0\n", &uintVal, uint(0)},
+ {"000\n", &uintVal, uint(0)},
+ {"0x10\n", &uintVal, uint(0x10)},
+ {"0377\n", &uintVal, uint(0377)},
+ {"22\n", &int8Val, int8(22)},
+ {"23\n", &int16Val, int16(23)},
+ {"24\n", &int32Val, int32(24)},
+ {"25\n", &int64Val, int64(25)},
+ {"127\n", &int8Val, int8(127)},
+ {"-21\n", &intVal, -21},
+ {"-22\n", &int8Val, int8(-22)},
+ {"-23\n", &int16Val, int16(-23)},
+ {"-24\n", &int32Val, int32(-24)},
+ {"-25\n", &int64Val, int64(-25)},
+ {"-128\n", &int8Val, int8(-128)},
+ {"+21\n", &intVal, +21},
+ {"+22\n", &int8Val, int8(+22)},
+ {"+23\n", &int16Val, int16(+23)},
+ {"+24\n", &int32Val, int32(+24)},
+ {"+25\n", &int64Val, int64(+25)},
+ {"+127\n", &int8Val, int8(+127)},
+ {"26\n", &uintVal, uint(26)},
+ {"27\n", &uint8Val, uint8(27)},
+ {"28\n", &uint16Val, uint16(28)},
+ {"29\n", &uint32Val, uint32(29)},
+ {"30\n", &uint64Val, uint64(30)},
+ {"255\n", &uint8Val, uint8(255)},
+ {"32767\n", &int16Val, int16(32767)},
+ {"2.3\n", &float64Val, 2.3},
+ {"2.3e1\n", &float32Val, float32(2.3e1)},
+ {"2.3e2\n", &float64Val, 2.3e2},
+ {"2.3p2\n", &float64Val, 2.3 * 4},
+ {"2.3p+2\n", &float64Val, 2.3 * 4},
+ {"2.3p+66\n", &float64Val, 2.3 * (1 << 32) * (1 << 32) * 4},
+ {"2.3p-66\n", &float64Val, 2.3 / ((1 << 32) * (1 << 32) * 4)},
+ {"2.35\n", &stringVal, "2.35"},
+ {"2345678\n", &bytesVal, []byte("2345678")},
+ {"(3.4e1-2i)\n", &complex128Val, 3.4e1 - 2i},
+ {"-3.45e1-3i\n", &complex64Val, complex64(-3.45e1 - 3i)},
+ {"-.45e1-1e2i\n", &complex128Val, complex128(-.45e1 - 100i)},
+ {"hello\n", &stringVal, "hello"},
+
+ // Carriage-return followed by newline. (We treat \r\n as \n always.)
+ {"hello\r\n", &stringVal, "hello"},
+ {"27\r\n", &uint8Val, uint8(27)},
+
+ // Renamed types
+ {"true\n", &renamedBoolVal, renamedBool(true)},
+ {"F\n", &renamedBoolVal, renamedBool(false)},
+ {"101\n", &renamedIntVal, renamedInt(101)},
+ {"102\n", &renamedIntVal, renamedInt(102)},
+ {"103\n", &renamedUintVal, renamedUint(103)},
+ {"104\n", &renamedUintVal, renamedUint(104)},
+ {"105\n", &renamedInt8Val, renamedInt8(105)},
+ {"106\n", &renamedInt16Val, renamedInt16(106)},
+ {"107\n", &renamedInt32Val, renamedInt32(107)},
+ {"108\n", &renamedInt64Val, renamedInt64(108)},
+ {"109\n", &renamedUint8Val, renamedUint8(109)},
+ {"110\n", &renamedUint16Val, renamedUint16(110)},
+ {"111\n", &renamedUint32Val, renamedUint32(111)},
+ {"112\n", &renamedUint64Val, renamedUint64(112)},
+ {"113\n", &renamedUintptrVal, renamedUintptr(113)},
+ {"114\n", &renamedStringVal, renamedString("114")},
+ {"115\n", &renamedBytesVal, renamedBytes([]byte("115"))},
+
+ // Custom scanners.
+ {" vvv ", &xVal, Xs("vvv")},
+ {" 1234hello", &intStringVal, IntString{1234, "hello"}},
+
+ // Fixed bugs
+ {"2147483648\n", &int64Val, int64(2147483648)}, // was: integer overflow
+}
+
+var scanfTests = []ScanfTest{
+ {"%v", "TRUE\n", &boolVal, true},
+ {"%t", "false\n", &boolVal, false},
+ {"%v", "-71\n", &intVal, -71},
+ {"%v", "0377\n", &intVal, 0377},
+ {"%v", "0x44\n", &intVal, 0x44},
+ {"%d", "72\n", &intVal, 72},
+ {"%c", "a\n", &runeVal, 'a'},
+ {"%c", "\u5072\n", &runeVal, '\u5072'},
+ {"%c", "\u1234\n", &runeVal, '\u1234'},
+ {"%d", "73\n", &int8Val, int8(73)},
+ {"%d", "+74\n", &int16Val, int16(74)},
+ {"%d", "75\n", &int32Val, int32(75)},
+ {"%d", "76\n", &int64Val, int64(76)},
+ {"%b", "1001001\n", &intVal, 73},
+ {"%o", "075\n", &intVal, 075},
+ {"%x", "a75\n", &intVal, 0xa75},
+ {"%v", "71\n", &uintVal, uint(71)},
+ {"%d", "72\n", &uintVal, uint(72)},
+ {"%d", "73\n", &uint8Val, uint8(73)},
+ {"%d", "74\n", &uint16Val, uint16(74)},
+ {"%d", "75\n", &uint32Val, uint32(75)},
+ {"%d", "76\n", &uint64Val, uint64(76)},
+ {"%b", "1001001\n", &uintVal, uint(73)},
+ {"%o", "075\n", &uintVal, uint(075)},
+ {"%x", "a75\n", &uintVal, uint(0xa75)},
+ {"%x", "A75\n", &uintVal, uint(0xa75)},
+ {"%U", "U+1234\n", &intVal, int(0x1234)},
+ {"%U", "U+4567\n", &uintVal, uint(0x4567)},
+
+ // Strings
+ {"%s", "using-%s\n", &stringVal, "using-%s"},
+ {"%x", "7573696e672d2578\n", &stringVal, "using-%x"},
+ {"%q", `"quoted\twith\\do\u0075bl\x65s"` + "\n", &stringVal, "quoted\twith\\doubles"},
+ {"%q", "`quoted with backs`\n", &stringVal, "quoted with backs"},
+
+ // Byte slices
+ {"%s", "bytes-%s\n", &bytesVal, []byte("bytes-%s")},
+ {"%x", "62797465732d2578\n", &bytesVal, []byte("bytes-%x")},
+ {"%q", `"bytes\rwith\vdo\u0075bl\x65s"` + "\n", &bytesVal, []byte("bytes\rwith\vdoubles")},
+ {"%q", "`bytes with backs`\n", &bytesVal, []byte("bytes with backs")},
+
+ // Renamed types
+ {"%v\n", "true\n", &renamedBoolVal, renamedBool(true)},
+ {"%t\n", "F\n", &renamedBoolVal, renamedBool(false)},
+ {"%v", "101\n", &renamedIntVal, renamedInt(101)},
+ {"%c", "\u0101\n", &renamedIntVal, renamedInt('\u0101')},
+ {"%o", "0146\n", &renamedIntVal, renamedInt(102)},
+ {"%v", "103\n", &renamedUintVal, renamedUint(103)},
+ {"%d", "104\n", &renamedUintVal, renamedUint(104)},
+ {"%d", "105\n", &renamedInt8Val, renamedInt8(105)},
+ {"%d", "106\n", &renamedInt16Val, renamedInt16(106)},
+ {"%d", "107\n", &renamedInt32Val, renamedInt32(107)},
+ {"%d", "108\n", &renamedInt64Val, renamedInt64(108)},
+ {"%x", "6D\n", &renamedUint8Val, renamedUint8(109)},
+ {"%o", "0156\n", &renamedUint16Val, renamedUint16(110)},
+ {"%d", "111\n", &renamedUint32Val, renamedUint32(111)},
+ {"%d", "112\n", &renamedUint64Val, renamedUint64(112)},
+ {"%d", "113\n", &renamedUintptrVal, renamedUintptr(113)},
+ {"%s", "114\n", &renamedStringVal, renamedString("114")},
+ {"%q", "\"1155\"\n", &renamedBytesVal, renamedBytes([]byte("1155"))},
+ {"%g", "116e1\n", &renamedFloat32Val, renamedFloat32(116e1)},
+ {"%g", "-11.7e+1", &renamedFloat64Val, renamedFloat64(-11.7e+1)},
+ {"%g", "11+6e1i\n", &renamedComplex64Val, renamedComplex64(11 + 6e1i)},
+ {"%g", "-11.+7e+1i", &renamedComplex128Val, renamedComplex128(-11. + 7e+1i)},
+
+ // Interesting formats
+ {"here is\tthe value:%d", "here is the\tvalue:118\n", &intVal, 118},
+ {"%% %%:%d", "% %:119\n", &intVal, 119},
+
+ // Corner cases
+ {"%x", "FFFFFFFF\n", &uint32Val, uint32(0xFFFFFFFF)},
+
+ // Custom scanner.
+ {"%s", " sss ", &xVal, Xs("sss")},
+ {"%2s", "sssss", &xVal, Xs("ss")},
+
+ // Fixed bugs
+ {"%d\n", "27\n", &intVal, 27}, // ok
+ {"%d\n", "28 \n", &intVal, 28}, // was: "unexpected newline"
+ {"%v", "0", &intVal, 0}, // was: "EOF"; 0 was taken as base prefix and not counted.
+ {"%v", "0", &uintVal, uint(0)}, // was: "EOF"; 0 was taken as base prefix and not counted.
+}
+
+var overflowTests = []ScanTest{
+ {"128", &int8Val, 0},
+ {"32768", &int16Val, 0},
+ {"-129", &int8Val, 0},
+ {"-32769", &int16Val, 0},
+ {"256", &uint8Val, 0},
+ {"65536", &uint16Val, 0},
+ {"1e100", &float32Val, 0},
+ {"1e500", &float64Val, 0},
+ {"(1e100+0i)", &complex64Val, 0},
+ {"(1+1e100i)", &complex64Val, 0},
+ {"(1-1e500i)", &complex128Val, 0},
+}
+
+var truth bool
+var i, j, k int
+var f float64
+var s, t string
+var c complex128
+var x, y Xs
+var z IntString
+var r1, r2, r3 rune
+
+var multiTests = []ScanfMultiTest{
+ {"", "", []interface{}{}, []interface{}{}, ""},
+ {"%d", "23", args(&i), args(23), ""},
+ {"%2s%3s", "22333", args(&s, &t), args("22", "333"), ""},
+ {"%2d%3d", "44555", args(&i, &j), args(44, 555), ""},
+ {"%2d.%3d", "66.777", args(&i, &j), args(66, 777), ""},
+ {"%d, %d", "23, 18", args(&i, &j), args(23, 18), ""},
+ {"%3d22%3d", "33322333", args(&i, &j), args(333, 333), ""},
+ {"%6vX=%3fY", "3+2iX=2.5Y", args(&c, &f), args((3 + 2i), 2.5), ""},
+ {"%d%s", "123abc", args(&i, &s), args(123, "abc"), ""},
+ {"%c%c%c", "2\u50c2X", args(&r1, &r2, &r3), args('2', '\u50c2', 'X'), ""},
+
+ // Custom scanners.
+ {"%e%f", "eefffff", args(&x, &y), args(Xs("ee"), Xs("fffff")), ""},
+ {"%4v%s", "12abcd", args(&z, &s), args(IntString{12, "ab"}, "cd"), ""},
+
+ // Errors
+ {"%t", "23 18", args(&i), nil, "bad verb"},
+ {"%d %d %d", "23 18", args(&i, &j), args(23, 18), "too few operands"},
+ {"%d %d", "23 18 27", args(&i, &j, &k), args(23, 18), "too many operands"},
+ {"%c", "\u0100", args(&int8Val), nil, "overflow"},
+ {"X%d", "10X", args(&intVal), nil, "input does not match format"},
+
+ // Bad UTF-8: should see every byte.
+ {"%c%c%c", "\xc2X\xc2", args(&r1, &r2, &r3), args(utf8.RuneError, 'X', utf8.RuneError), ""},
+
+ // Fixed bugs
+ {"%v%v", "FALSE23", args(&truth, &i), args(false, 23), ""},
+}
+
+func testScan(name string, t *testing.T, scan func(r io.Reader, a ...interface{}) (int, error)) {
+ for _, test := range scanTests {
+ var r io.Reader
+ if name == "StringReader" {
+ r = strings.NewReader(test.text)
+ } else {
+ r = newReader(test.text)
+ }
+ n, err := scan(r, test.in)
+ if err != nil {
+ m := ""
+ if n > 0 {
+ m = Sprintf(" (%d fields ok)", n)
+ }
+ t.Errorf("%s got error scanning %q: %s%s", name, test.text, err, m)
+ continue
+ }
+ if n != 1 {
+ t.Errorf("%s count error on entry %q: got %d", name, test.text, n)
+ continue
+ }
+ // The incoming value may be a pointer
+ v := reflect.ValueOf(test.in)
+ if p := v; p.Kind() == reflect.Ptr {
+ v = p.Elem()
+ }
+ val := v.Interface()
+ if !reflect.DeepEqual(val, test.out) {
+ t.Errorf("%s scanning %q: expected %#v got %#v, type %T", name, test.text, test.out, val, val)
+ }
+ }
+}
+
+func TestScan(t *testing.T) {
+ testScan("StringReader", t, Fscan)
+}
+
+func TestMyReaderScan(t *testing.T) {
+ testScan("myStringReader", t, Fscan)
+}
+
+func TestScanln(t *testing.T) {
+ testScan("StringReader", t, Fscanln)
+}
+
+func TestMyReaderScanln(t *testing.T) {
+ testScan("myStringReader", t, Fscanln)
+}
+
+func TestScanf(t *testing.T) {
+ for _, test := range scanfTests {
+ n, err := Sscanf(test.text, 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.ValueOf(test.in)
+ if p := v; p.Kind() == reflect.Ptr {
+ 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 := regexp.MustCompile("overflow|too large|out of range|not representable")
+ for _, test := range overflowTests {
+ _, err := Sscan(test.text, test.in)
+ if err == nil {
+ t.Errorf("expected overflow scanning %q", test.text)
+ continue
+ }
+ if !re.MatchString(err.Error()) {
+ t.Errorf("expected overflow error scanning %q: %s", test.text, err)
+ }
+ }
+}
+
+func verifyNaN(str string, t *testing.T) {
+ var f float64
+ var f32 float32
+ var f64 float64
+ text := str + " " + str + " " + str
+ n, err := Fscan(strings.NewReader(text), &f, &f32, &f64)
+ if err != nil {
+ t.Errorf("got error scanning %q: %s", text, err)
+ }
+ if n != 3 {
+ t.Errorf("count error scanning %q: got %d", text, n)
+ }
+ if !math.IsNaN(float64(f)) || !math.IsNaN(float64(f32)) || !math.IsNaN(f64) {
+ t.Errorf("didn't get NaNs scanning %q: got %g %g %g", text, f, f32, f64)
+ }
+}
+
+func TestNaN(t *testing.T) {
+ for _, s := range []string{"nan", "NAN", "NaN"} {
+ verifyNaN(s, t)
+ }
+}
+
+func verifyInf(str string, t *testing.T) {
+ var f float64
+ var f32 float32
+ var f64 float64
+ text := str + " " + str + " " + str
+ n, err := Fscan(strings.NewReader(text), &f, &f32, &f64)
+ if err != nil {
+ t.Errorf("got error scanning %q: %s", text, err)
+ }
+ if n != 3 {
+ t.Errorf("count error scanning %q: got %d", text, n)
+ }
+ sign := 1
+ if str[0] == '-' {
+ sign = -1
+ }
+ if !math.IsInf(float64(f), sign) || !math.IsInf(float64(f32), sign) || !math.IsInf(f64, sign) {
+ t.Errorf("didn't get right Infs scanning %q: got %g %g %g", text, f, f32, f64)
+ }
+}
+
+func TestInf(t *testing.T) {
+ for _, s := range []string{"inf", "+inf", "-inf", "INF", "-INF", "+INF", "Inf", "-Inf", "+Inf"} {
+ verifyInf(s, t)
+ }
+}
+
+func testScanfMulti(name string, t *testing.T) {
+ sliceType := reflect.TypeOf(make([]interface{}, 1))
+ for _, test := range multiTests {
+ var r io.Reader
+ if name == "StringReader" {
+ r = strings.NewReader(test.text)
+ } else {
+ r = newReader(test.text)
+ }
+ n, err := Fscanf(r, test.format, test.in...)
+ if err != nil {
+ if test.err == "" {
+ t.Errorf("got error scanning (%q, %q): %q", test.format, test.text, err)
+ } else if strings.Index(err.Error(), test.err) < 0 {
+ t.Errorf("got wrong error scanning (%q, %q): %q; expected %q", test.format, test.text, err, test.err)
+ }
+ continue
+ }
+ if test.err != "" {
+ t.Errorf("expected error %q error scanning (%q, %q)", test.err, test.format, test.text)
+ }
+ if n != len(test.out) {
+ t.Errorf("count error on entry (%q, %q): expected %d got %d", test.format, test.text, len(test.out), n)
+ continue
+ }
+ // Convert the slice of pointers into a slice of values
+ resultVal := reflect.MakeSlice(sliceType, n, n)
+ for i := 0; i < n; i++ {
+ v := reflect.ValueOf(test.in[i]).Elem()
+ resultVal.Index(i).Set(v)
+ }
+ result := resultVal.Interface()
+ if !reflect.DeepEqual(result, test.out) {
+ t.Errorf("scanning (%q, %q): expected %#v got %#v", test.format, test.text, test.out, result)
+ }
+ }
+}
+
+func TestScanfMulti(t *testing.T) {
+ testScanfMulti("StringReader", t)
+}
+
+func TestMyReaderScanfMulti(t *testing.T) {
+ testScanfMulti("myStringReader", t)
+}
+
+func TestScanMultiple(t *testing.T) {
+ var a int
+ var s string
+ n, err := Sscan("123abc", &a, &s)
+ if n != 2 {
+ t.Errorf("Sscan count error: expected 2: got %d", n)
+ }
+ if err != nil {
+ t.Errorf("Sscan expected no error; got %s", err)
+ }
+ if a != 123 || s != "abc" {
+ t.Errorf("Sscan wrong values: got (%d %q) expected (123 \"abc\")", a, s)
+ }
+ n, err = Sscan("asdf", &s, &a)
+ if n != 1 {
+ t.Errorf("Sscan count error: expected 1: got %d", n)
+ }
+ if err == nil {
+ t.Errorf("Sscan expected error; got none: %s", err)
+ }
+ if s != "asdf" {
+ t.Errorf("Sscan wrong values: got %q expected \"asdf\"", s)
+ }
+}
+
+// Empty strings are not valid input when scanning a string.
+func TestScanEmpty(t *testing.T) {
+ var s1, s2 string
+ n, err := Sscan("abc", &s1, &s2)
+ if n != 1 {
+ t.Errorf("Sscan count error: expected 1: got %d", n)
+ }
+ if err == nil {
+ t.Error("Sscan <one item> expected error; got none")
+ }
+ if s1 != "abc" {
+ t.Errorf("Sscan wrong values: got %q expected \"abc\"", s1)
+ }
+ n, err = Sscan("", &s1, &s2)
+ if n != 0 {
+ t.Errorf("Sscan count error: expected 0: got %d", n)
+ }
+ if err == nil {
+ t.Error("Sscan <empty> expected error; got none")
+ }
+ // Quoted empty string is OK.
+ n, err = Sscanf(`""`, "%q", &s1)
+ if n != 1 {
+ t.Errorf("Sscanf count error: expected 1: got %d", n)
+ }
+ if err != nil {
+ t.Errorf("Sscanf <empty> expected no error with quoted string; got %s", err)
+ }
+}
+
+func TestScanNotPointer(t *testing.T) {
+ r := strings.NewReader("1")
+ var a int
+ _, err := Fscan(r, a)
+ if err == nil {
+ t.Error("expected error scanning non-pointer")
+ } else if strings.Index(err.Error(), "pointer") < 0 {
+ t.Errorf("expected pointer error scanning non-pointer, got: %s", err)
+ }
+}
+
+func TestScanlnNoNewline(t *testing.T) {
+ var a int
+ _, err := Sscanln("1 x\n", &a)
+ if err == nil {
+ t.Error("expected error scanning string missing newline")
+ } else if strings.Index(err.Error(), "newline") < 0 {
+ t.Errorf("expected newline error scanning string missing newline, got: %s", err)
+ }
+}
+
+func TestScanlnWithMiddleNewline(t *testing.T) {
+ r := strings.NewReader("123\n456\n")
+ var a, b int
+ _, err := Fscanln(r, &a, &b)
+ if err == nil {
+ t.Error("expected error scanning string with extra newline")
+ } else if strings.Index(err.Error(), "newline") < 0 {
+ t.Errorf("expected newline error scanning string with extra newline, got: %s", err)
+ }
+}
+
+// eofCounter is a special Reader that counts reads at end of file.
+type eofCounter struct {
+ reader *strings.Reader
+ eofCount int
+}
+
+func (ec *eofCounter) Read(b []byte) (n int, err error) {
+ n, err = ec.reader.Read(b)
+ if n == 0 {
+ ec.eofCount++
+ }
+ return
+}
+
+// TestEOF verifies that when we scan, we see at most EOF once per call to a
+// Scan function, and then only when it's really an EOF.
+func TestEOF(t *testing.T) {
+ ec := &eofCounter{strings.NewReader("123\n"), 0}
+ var a int
+ n, err := Fscanln(ec, &a)
+ if err != nil {
+ t.Error("unexpected error", err)
+ }
+ if n != 1 {
+ t.Error("expected to scan one item, got", n)
+ }
+ if ec.eofCount != 0 {
+ t.Error("expected zero EOFs", ec.eofCount)
+ ec.eofCount = 0 // reset for next test
+ }
+ n, err = Fscanln(ec, &a)
+ if err == nil {
+ t.Error("expected error scanning empty string")
+ }
+ if n != 0 {
+ t.Error("expected to scan zero items, got", n)
+ }
+ if ec.eofCount != 1 {
+ t.Error("expected one EOF, got", ec.eofCount)
+ }
+}
+
+// TestEOFAtEndOfInput verifies that we see an EOF error if we run out of input.
+// This was a buglet: we used to get "expected integer".
+func TestEOFAtEndOfInput(t *testing.T) {
+ var i, j int
+ n, err := Sscanf("23", "%d %d", &i, &j)
+ if n != 1 || i != 23 {
+ t.Errorf("Sscanf expected one value of 23; got %d %d", n, i)
+ }
+ if err != io.EOF {
+ t.Errorf("Sscanf expected EOF; got %q", err)
+ }
+ n, err = Sscan("234", &i, &j)
+ if n != 1 || i != 234 {
+ t.Errorf("Sscan expected one value of 234; got %d %d", n, i)
+ }
+ if err != io.EOF {
+ t.Errorf("Sscan expected EOF; got %q", err)
+ }
+ // Trailing space is tougher.
+ n, err = Sscan("234 ", &i, &j)
+ if n != 1 || i != 234 {
+ t.Errorf("Sscan expected one value of 234; got %d %d", n, i)
+ }
+ if err != io.EOF {
+ t.Errorf("Sscan expected EOF; got %q", err)
+ }
+}
+
+var eofTests = []struct {
+ format string
+ v interface{}
+}{
+ {"%s", &stringVal},
+ {"%q", &stringVal},
+ {"%x", &stringVal},
+ {"%v", &stringVal},
+ {"%v", &bytesVal},
+ {"%v", &intVal},
+ {"%v", &uintVal},
+ {"%v", &boolVal},
+ {"%v", &float32Val},
+ {"%v", &complex64Val},
+ {"%v", &renamedStringVal},
+ {"%v", &renamedBytesVal},
+ {"%v", &renamedIntVal},
+ {"%v", &renamedUintVal},
+ {"%v", &renamedBoolVal},
+ {"%v", &renamedFloat32Val},
+ {"%v", &renamedComplex64Val},
+}
+
+func TestEOFAllTypes(t *testing.T) {
+ for i, test := range eofTests {
+ if _, err := Sscanf("", test.format, test.v); err != io.EOF {
+ t.Errorf("#%d: %s %T not eof on empty string: %s", i, test.format, test.v, err)
+ }
+ if _, err := Sscanf(" ", test.format, test.v); err != io.EOF {
+ t.Errorf("#%d: %s %T not eof on trailing blanks: %s", i, test.format, test.v, err)
+ }
+ }
+}
+
+// TestUnreadRuneWithBufio verifies that, at least when using bufio, successive
+// calls to Fscan do not lose runes.
+func TestUnreadRuneWithBufio(t *testing.T) {
+ r := bufio.NewReader(strings.NewReader("123αb"))
+ var i int
+ var a string
+ n, err := Fscanf(r, "%d", &i)
+ if n != 1 || err != nil {
+ t.Errorf("reading int expected one item, no errors; got %d %q", n, err)
+ }
+ if i != 123 {
+ t.Errorf("expected 123; got %d", i)
+ }
+ n, err = Fscanf(r, "%s", &a)
+ if n != 1 || err != nil {
+ t.Errorf("reading string expected one item, no errors; got %d %q", n, err)
+ }
+ if a != "αb" {
+ t.Errorf("expected αb; got %q", a)
+ }
+}
+
+type TwoLines string
+
+// Scan attempts to read two lines into the object. Scanln should prevent this
+// because it stops at newline; Scan and Scanf should be fine.
+func (t *TwoLines) Scan(state ScanState, verb rune) error {
+ chars := make([]rune, 0, 100)
+ for nlCount := 0; nlCount < 2; {
+ c, _, err := state.ReadRune()
+ if err != nil {
+ return err
+ }
+ chars = append(chars, c)
+ if c == '\n' {
+ nlCount++
+ }
+ }
+ *t = TwoLines(string(chars))
+ return nil
+}
+
+func TestMultiLine(t *testing.T) {
+ input := "abc\ndef\n"
+ // Sscan should work
+ var tscan TwoLines
+ n, err := Sscan(input, &tscan)
+ if n != 1 {
+ t.Errorf("Sscan: expected 1 item; got %d", n)
+ }
+ if err != nil {
+ t.Errorf("Sscan: expected no error; got %s", err)
+ }
+ if string(tscan) != input {
+ t.Errorf("Sscan: expected %q; got %q", input, tscan)
+ }
+ // Sscanf should work
+ var tscanf TwoLines
+ n, err = Sscanf(input, "%s", &tscanf)
+ if n != 1 {
+ t.Errorf("Sscanf: expected 1 item; got %d", n)
+ }
+ if err != nil {
+ t.Errorf("Sscanf: expected no error; got %s", err)
+ }
+ if string(tscanf) != input {
+ t.Errorf("Sscanf: expected %q; got %q", input, tscanf)
+ }
+ // Sscanln should not work
+ var tscanln TwoLines
+ n, err = Sscanln(input, &tscanln)
+ if n != 0 {
+ t.Errorf("Sscanln: expected 0 items; got %d: %q", n, tscanln)
+ }
+ if err == nil {
+ t.Error("Sscanln: expected error; got none")
+ } else if err != io.ErrUnexpectedEOF {
+ t.Errorf("Sscanln: expected io.ErrUnexpectedEOF (ha!); got %s", err)
+ }
+}
+
+// simpleReader is a strings.Reader that implements only Read, not ReadRune.
+// Good for testing readahead.
+type simpleReader struct {
+ sr *strings.Reader
+}
+
+func (s *simpleReader) Read(b []byte) (n int, err error) {
+ return s.sr.Read(b)
+}
+
+// TestLineByLineFscanf tests that Fscanf does not read past newline. Issue
+// 3481.
+func TestLineByLineFscanf(t *testing.T) {
+ r := &simpleReader{strings.NewReader("1\n2\n")}
+ var i, j int
+ n, err := Fscanf(r, "%v\n", &i)
+ if n != 1 || err != nil {
+ t.Fatalf("first read: %d %q", n, err)
+ }
+ n, err = Fscanf(r, "%v\n", &j)
+ if n != 1 || err != nil {
+ t.Fatalf("second read: %d %q", n, err)
+ }
+ if i != 1 || j != 2 {
+ t.Errorf("wrong values; wanted 1 2 got %d %d", i, j)
+ }
+}
+
+// TestScanStateCount verifies the correct byte count is returned. Issue 8512.
+
+// runeScanner implements the Scanner interface for TestScanStateCount.
+type runeScanner struct {
+ rune rune
+ size int
+}
+
+func (rs *runeScanner) Scan(state ScanState, verb rune) error {
+ r, size, err := state.ReadRune()
+ rs.rune = r
+ rs.size = size
+ return err
+}
+
+func TestScanStateCount(t *testing.T) {
+ var a, b, c runeScanner
+ n, err := Sscanf("12➂", "%c%c%c", &a, &b, &c)
+ if err != nil {
+ t.Fatal(err)
+ }
+ if n != 3 {
+ t.Fatalf("expected 3 items consumed, got %d")
+ }
+ if a.rune != '1' || b.rune != '2' || c.rune != '➂' {
+ t.Errorf("bad scan rune: %q %q %q should be '1' '2' '➂'", a.rune, b.rune, c.rune)
+ }
+ if a.size != 1 || b.size != 1 || c.size != 3 {
+ t.Errorf("bad scan size: %q %q %q should be 1 1 3", a.size, b.size, c.size)
+ }
+}
+
+// RecursiveInt accepts a string matching %d.%d.%d....
+// and parses it into a linked list.
+// It allows us to benchmark recursive descent style scanners.
+type RecursiveInt struct {
+ i int
+ next *RecursiveInt
+}
+
+func (r *RecursiveInt) Scan(state ScanState, verb rune) (err error) {
+ _, err = Fscan(state, &r.i)
+ if err != nil {
+ return
+ }
+ next := new(RecursiveInt)
+ _, err = Fscanf(state, ".%v", next)
+ if err != nil {
+ if err == io.ErrUnexpectedEOF {
+ err = nil
+ }
+ return
+ }
+ r.next = next
+ return
+}
+
+// scanInts performs the same scanning task as RecursiveInt.Scan
+// but without recurring through scanner, so we can compare
+// performance more directly.
+func scanInts(r *RecursiveInt, b *bytes.Buffer) (err error) {
+ r.next = nil
+ _, err = Fscan(b, &r.i)
+ if err != nil {
+ return
+ }
+ c, _, err := b.ReadRune()
+ if err != nil {
+ if err == io.EOF {
+ err = nil
+ }
+ return
+ }
+ if c != '.' {
+ return
+ }
+ next := new(RecursiveInt)
+ err = scanInts(next, b)
+ if err == nil {
+ r.next = next
+ }
+ return
+}
+
+func makeInts(n int) []byte {
+ var buf bytes.Buffer
+ Fprintf(&buf, "1")
+ for i := 1; i < n; i++ {
+ Fprintf(&buf, ".%d", i+1)
+ }
+ return buf.Bytes()
+}
+
+func TestScanInts(t *testing.T) {
+ testScanInts(t, scanInts)
+ testScanInts(t, func(r *RecursiveInt, b *bytes.Buffer) (err error) {
+ _, err = Fscan(b, r)
+ return
+ })
+}
+
+// 800 is small enough to not overflow the stack when using gccgo on a
+// platform that does not support split stack.
+const intCount = 800
+
+func testScanInts(t *testing.T, scan func(*RecursiveInt, *bytes.Buffer) error) {
+ r := new(RecursiveInt)
+ ints := makeInts(intCount)
+ buf := bytes.NewBuffer(ints)
+ err := scan(r, buf)
+ if err != nil {
+ t.Error("unexpected error", err)
+ }
+ i := 1
+ for ; r != nil; r = r.next {
+ if r.i != i {
+ t.Fatalf("bad scan: expected %d got %d", i, r.i)
+ }
+ i++
+ }
+ if i-1 != intCount {
+ t.Fatalf("bad scan count: expected %d got %d", intCount, i-1)
+ }
+}
+
+func BenchmarkScanInts(b *testing.B) {
+ b.ResetTimer()
+ ints := makeInts(intCount)
+ var r RecursiveInt
+ for i := b.N - 1; i >= 0; i-- {
+ buf := bytes.NewBuffer(ints)
+ b.StartTimer()
+ scanInts(&r, buf)
+ b.StopTimer()
+ }
+}
+
+func BenchmarkScanRecursiveInt(b *testing.B) {
+ b.ResetTimer()
+ ints := makeInts(intCount)
+ var r RecursiveInt
+ for i := b.N - 1; i >= 0; i-- {
+ buf := bytes.NewBuffer(ints)
+ b.StartTimer()
+ Fscan(buf, &r)
+ b.StopTimer()
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-17 08:45:45 +0000