956 lines
26 KiB
Go
956 lines
26 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fmt_test
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import (
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"bufio"
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"bytes"
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"errors"
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. "fmt"
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"io"
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"math"
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"reflect"
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"regexp"
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"strings"
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"testing"
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"unicode/utf8"
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)
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type ScanTest struct {
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text string
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in interface{}
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out interface{}
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}
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type ScanfTest struct {
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format string
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text string
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in interface{}
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out interface{}
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}
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type ScanfMultiTest struct {
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format string
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text string
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in []interface{}
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out []interface{}
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err string
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}
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var (
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boolVal bool
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intVal int
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int8Val int8
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int16Val int16
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int32Val int32
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int64Val int64
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uintVal uint
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uint8Val uint8
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uint16Val uint16
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uint32Val uint32
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uint64Val uint64
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float32Val float32
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float64Val float64
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stringVal string
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stringVal1 string
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bytesVal []byte
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runeVal rune
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complex64Val complex64
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complex128Val complex128
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renamedBoolVal renamedBool
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renamedIntVal renamedInt
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renamedInt8Val renamedInt8
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renamedInt16Val renamedInt16
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renamedInt32Val renamedInt32
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renamedInt64Val renamedInt64
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renamedUintVal renamedUint
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renamedUint8Val renamedUint8
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renamedUint16Val renamedUint16
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renamedUint32Val renamedUint32
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renamedUint64Val renamedUint64
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renamedUintptrVal renamedUintptr
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renamedStringVal renamedString
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renamedBytesVal renamedBytes
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renamedFloat32Val renamedFloat32
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renamedFloat64Val renamedFloat64
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renamedComplex64Val renamedComplex64
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renamedComplex128Val renamedComplex128
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)
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type FloatTest struct {
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text string
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in float64
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out float64
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}
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// Xs accepts any non-empty run of the verb character
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type Xs string
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func (x *Xs) Scan(state ScanState, verb rune) error {
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tok, err := state.Token(true, func(r rune) bool { return r == verb })
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if err != nil {
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return err
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}
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s := string(tok)
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if !regexp.MustCompile("^" + string(verb) + "+$").MatchString(s) {
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return errors.New("syntax error for xs")
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}
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*x = Xs(s)
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return nil
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}
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var xVal Xs
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// IntString accepts an integer followed immediately by a string.
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// It tests the embedding of a scan within a scan.
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type IntString struct {
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i int
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s string
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}
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func (s *IntString) Scan(state ScanState, verb rune) error {
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if _, err := Fscan(state, &s.i); err != nil {
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return err
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}
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tok, err := state.Token(true, nil)
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if err != nil {
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return err
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}
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s.s = string(tok)
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return nil
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}
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var intStringVal IntString
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// myStringReader implements Read but not ReadRune, allowing us to test our readRune wrapper
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// type that creates something that can read runes given only Read().
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type myStringReader struct {
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r *strings.Reader
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}
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func (s *myStringReader) Read(p []byte) (n int, err error) {
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return s.r.Read(p)
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}
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func newReader(s string) *myStringReader {
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return &myStringReader{strings.NewReader(s)}
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}
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var scanTests = []ScanTest{
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// Basic types
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{"T\n", &boolVal, true}, // boolean test vals toggle to be sure they are written
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{"F\n", &boolVal, false}, // restored to zero value
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{"21\n", &intVal, 21},
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{"0\n", &intVal, 0},
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{"000\n", &intVal, 0},
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{"0x10\n", &intVal, 0x10},
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{"-0x10\n", &intVal, -0x10},
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{"0377\n", &intVal, 0377},
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{"-0377\n", &intVal, -0377},
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{"0\n", &uintVal, uint(0)},
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{"000\n", &uintVal, uint(0)},
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{"0x10\n", &uintVal, uint(0x10)},
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{"0377\n", &uintVal, uint(0377)},
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{"22\n", &int8Val, int8(22)},
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{"23\n", &int16Val, int16(23)},
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{"24\n", &int32Val, int32(24)},
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{"25\n", &int64Val, int64(25)},
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{"127\n", &int8Val, int8(127)},
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{"-21\n", &intVal, -21},
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{"-22\n", &int8Val, int8(-22)},
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{"-23\n", &int16Val, int16(-23)},
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{"-24\n", &int32Val, int32(-24)},
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{"-25\n", &int64Val, int64(-25)},
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{"-128\n", &int8Val, int8(-128)},
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{"+21\n", &intVal, +21},
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{"+22\n", &int8Val, int8(+22)},
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{"+23\n", &int16Val, int16(+23)},
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{"+24\n", &int32Val, int32(+24)},
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{"+25\n", &int64Val, int64(+25)},
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{"+127\n", &int8Val, int8(+127)},
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{"26\n", &uintVal, uint(26)},
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{"27\n", &uint8Val, uint8(27)},
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{"28\n", &uint16Val, uint16(28)},
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{"29\n", &uint32Val, uint32(29)},
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{"30\n", &uint64Val, uint64(30)},
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{"255\n", &uint8Val, uint8(255)},
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{"32767\n", &int16Val, int16(32767)},
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{"2.3\n", &float64Val, 2.3},
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{"2.3e1\n", &float32Val, float32(2.3e1)},
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{"2.3e2\n", &float64Val, 2.3e2},
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{"2.3p2\n", &float64Val, 2.3 * 4},
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{"2.3p+2\n", &float64Val, 2.3 * 4},
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{"2.3p+66\n", &float64Val, 2.3 * (1 << 32) * (1 << 32) * 4},
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{"2.3p-66\n", &float64Val, 2.3 / ((1 << 32) * (1 << 32) * 4)},
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{"2.35\n", &stringVal, "2.35"},
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{"2345678\n", &bytesVal, []byte("2345678")},
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{"(3.4e1-2i)\n", &complex128Val, 3.4e1 - 2i},
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{"-3.45e1-3i\n", &complex64Val, complex64(-3.45e1 - 3i)},
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{"-.45e1-1e2i\n", &complex128Val, complex128(-.45e1 - 100i)},
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{"hello\n", &stringVal, "hello"},
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// Renamed types
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{"true\n", &renamedBoolVal, renamedBool(true)},
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{"F\n", &renamedBoolVal, renamedBool(false)},
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{"101\n", &renamedIntVal, renamedInt(101)},
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{"102\n", &renamedIntVal, renamedInt(102)},
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{"103\n", &renamedUintVal, renamedUint(103)},
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{"104\n", &renamedUintVal, renamedUint(104)},
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{"105\n", &renamedInt8Val, renamedInt8(105)},
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{"106\n", &renamedInt16Val, renamedInt16(106)},
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{"107\n", &renamedInt32Val, renamedInt32(107)},
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{"108\n", &renamedInt64Val, renamedInt64(108)},
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{"109\n", &renamedUint8Val, renamedUint8(109)},
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{"110\n", &renamedUint16Val, renamedUint16(110)},
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{"111\n", &renamedUint32Val, renamedUint32(111)},
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{"112\n", &renamedUint64Val, renamedUint64(112)},
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{"113\n", &renamedUintptrVal, renamedUintptr(113)},
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{"114\n", &renamedStringVal, renamedString("114")},
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{"115\n", &renamedBytesVal, renamedBytes([]byte("115"))},
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// Custom scanners.
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{" vvv ", &xVal, Xs("vvv")},
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{" 1234hello", &intStringVal, IntString{1234, "hello"}},
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// Fixed bugs
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{"2147483648\n", &int64Val, int64(2147483648)}, // was: integer overflow
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}
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var scanfTests = []ScanfTest{
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{"%v", "TRUE\n", &boolVal, true},
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{"%t", "false\n", &boolVal, false},
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{"%v", "-71\n", &intVal, -71},
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{"%v", "0377\n", &intVal, 0377},
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{"%v", "0x44\n", &intVal, 0x44},
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{"%d", "72\n", &intVal, 72},
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{"%c", "a\n", &runeVal, 'a'},
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{"%c", "\u5072\n", &runeVal, '\u5072'},
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{"%c", "\u1234\n", &runeVal, '\u1234'},
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{"%d", "73\n", &int8Val, int8(73)},
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{"%d", "+74\n", &int16Val, int16(74)},
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{"%d", "75\n", &int32Val, int32(75)},
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{"%d", "76\n", &int64Val, int64(76)},
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{"%b", "1001001\n", &intVal, 73},
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{"%o", "075\n", &intVal, 075},
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{"%x", "a75\n", &intVal, 0xa75},
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{"%v", "71\n", &uintVal, uint(71)},
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{"%d", "72\n", &uintVal, uint(72)},
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{"%d", "73\n", &uint8Val, uint8(73)},
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{"%d", "74\n", &uint16Val, uint16(74)},
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{"%d", "75\n", &uint32Val, uint32(75)},
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{"%d", "76\n", &uint64Val, uint64(76)},
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{"%b", "1001001\n", &uintVal, uint(73)},
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{"%o", "075\n", &uintVal, uint(075)},
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{"%x", "a75\n", &uintVal, uint(0xa75)},
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{"%x", "A75\n", &uintVal, uint(0xa75)},
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{"%U", "U+1234\n", &intVal, int(0x1234)},
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{"%U", "U+4567\n", &uintVal, uint(0x4567)},
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// Strings
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{"%s", "using-%s\n", &stringVal, "using-%s"},
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{"%x", "7573696e672d2578\n", &stringVal, "using-%x"},
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{"%q", `"quoted\twith\\do\u0075bl\x65s"` + "\n", &stringVal, "quoted\twith\\doubles"},
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{"%q", "`quoted with backs`\n", &stringVal, "quoted with backs"},
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// Byte slices
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{"%s", "bytes-%s\n", &bytesVal, []byte("bytes-%s")},
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{"%x", "62797465732d2578\n", &bytesVal, []byte("bytes-%x")},
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{"%q", `"bytes\rwith\vdo\u0075bl\x65s"` + "\n", &bytesVal, []byte("bytes\rwith\vdoubles")},
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{"%q", "`bytes with backs`\n", &bytesVal, []byte("bytes with backs")},
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// Renamed types
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{"%v\n", "true\n", &renamedBoolVal, renamedBool(true)},
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{"%t\n", "F\n", &renamedBoolVal, renamedBool(false)},
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{"%v", "101\n", &renamedIntVal, renamedInt(101)},
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{"%c", "\u0101\n", &renamedIntVal, renamedInt('\u0101')},
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{"%o", "0146\n", &renamedIntVal, renamedInt(102)},
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{"%v", "103\n", &renamedUintVal, renamedUint(103)},
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{"%d", "104\n", &renamedUintVal, renamedUint(104)},
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{"%d", "105\n", &renamedInt8Val, renamedInt8(105)},
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{"%d", "106\n", &renamedInt16Val, renamedInt16(106)},
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{"%d", "107\n", &renamedInt32Val, renamedInt32(107)},
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{"%d", "108\n", &renamedInt64Val, renamedInt64(108)},
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{"%x", "6D\n", &renamedUint8Val, renamedUint8(109)},
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{"%o", "0156\n", &renamedUint16Val, renamedUint16(110)},
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{"%d", "111\n", &renamedUint32Val, renamedUint32(111)},
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{"%d", "112\n", &renamedUint64Val, renamedUint64(112)},
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{"%d", "113\n", &renamedUintptrVal, renamedUintptr(113)},
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{"%s", "114\n", &renamedStringVal, renamedString("114")},
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{"%q", "\"1155\"\n", &renamedBytesVal, renamedBytes([]byte("1155"))},
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{"%g", "116e1\n", &renamedFloat32Val, renamedFloat32(116e1)},
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{"%g", "-11.7e+1", &renamedFloat64Val, renamedFloat64(-11.7e+1)},
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{"%g", "11+6e1i\n", &renamedComplex64Val, renamedComplex64(11 + 6e1i)},
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{"%g", "-11.+7e+1i", &renamedComplex128Val, renamedComplex128(-11. + 7e+1i)},
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// Interesting formats
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{"here is\tthe value:%d", "here is the\tvalue:118\n", &intVal, 118},
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{"%% %%:%d", "% %:119\n", &intVal, 119},
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// Corner cases
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{"%x", "FFFFFFFF\n", &uint32Val, uint32(0xFFFFFFFF)},
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// Custom scanner.
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{"%s", " sss ", &xVal, Xs("sss")},
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{"%2s", "sssss", &xVal, Xs("ss")},
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// Fixed bugs
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{"%d\n", "27\n", &intVal, 27}, // ok
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{"%d\n", "28 \n", &intVal, 28}, // was: "unexpected newline"
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{"%v", "0", &intVal, 0}, // was: "EOF"; 0 was taken as base prefix and not counted.
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{"%v", "0", &uintVal, uint(0)}, // was: "EOF"; 0 was taken as base prefix and not counted.
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}
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var overflowTests = []ScanTest{
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{"128", &int8Val, 0},
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{"32768", &int16Val, 0},
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{"-129", &int8Val, 0},
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{"-32769", &int16Val, 0},
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{"256", &uint8Val, 0},
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{"65536", &uint16Val, 0},
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{"1e100", &float32Val, 0},
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{"1e500", &float64Val, 0},
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{"(1e100+0i)", &complex64Val, 0},
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{"(1+1e100i)", &complex64Val, 0},
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{"(1-1e500i)", &complex128Val, 0},
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}
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var truth bool
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var i, j, k int
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var f float64
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var s, t string
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var c complex128
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var x, y Xs
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var z IntString
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var r1, r2, r3 rune
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var multiTests = []ScanfMultiTest{
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{"", "", []interface{}{}, []interface{}{}, ""},
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{"%d", "23", args(&i), args(23), ""},
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{"%2s%3s", "22333", args(&s, &t), args("22", "333"), ""},
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{"%2d%3d", "44555", args(&i, &j), args(44, 555), ""},
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{"%2d.%3d", "66.777", args(&i, &j), args(66, 777), ""},
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{"%d, %d", "23, 18", args(&i, &j), args(23, 18), ""},
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{"%3d22%3d", "33322333", args(&i, &j), args(333, 333), ""},
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{"%6vX=%3fY", "3+2iX=2.5Y", args(&c, &f), args((3 + 2i), 2.5), ""},
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{"%d%s", "123abc", args(&i, &s), args(123, "abc"), ""},
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{"%c%c%c", "2\u50c2X", args(&r1, &r2, &r3), args('2', '\u50c2', 'X'), ""},
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// Custom scanners.
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{"%e%f", "eefffff", args(&x, &y), args(Xs("ee"), Xs("fffff")), ""},
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{"%4v%s", "12abcd", args(&z, &s), args(IntString{12, "ab"}, "cd"), ""},
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// Errors
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{"%t", "23 18", args(&i), nil, "bad verb"},
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{"%d %d %d", "23 18", args(&i, &j), args(23, 18), "too few operands"},
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{"%d %d", "23 18 27", args(&i, &j, &k), args(23, 18), "too many operands"},
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{"%c", "\u0100", args(&int8Val), nil, "overflow"},
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{"X%d", "10X", args(&intVal), nil, "input does not match format"},
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// Bad UTF-8: should see every byte.
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{"%c%c%c", "\xc2X\xc2", args(&r1, &r2, &r3), args(utf8.RuneError, 'X', utf8.RuneError), ""},
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// Fixed bugs
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{"%v%v", "FALSE23", args(&truth, &i), args(false, 23), ""},
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}
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func testScan(name string, t *testing.T, scan func(r io.Reader, a ...interface{}) (int, error)) {
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for _, test := range scanTests {
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var r io.Reader
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if name == "StringReader" {
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r = strings.NewReader(test.text)
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} else {
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r = newReader(test.text)
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}
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n, err := scan(r, test.in)
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if err != nil {
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m := ""
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if n > 0 {
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m = Sprintf(" (%d fields ok)", n)
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}
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t.Errorf("%s got error scanning %q: %s%s", name, test.text, err, m)
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continue
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}
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if n != 1 {
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t.Errorf("%s count error on entry %q: got %d", name, test.text, n)
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continue
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}
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// The incoming value may be a pointer
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v := reflect.ValueOf(test.in)
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if p := v; p.Kind() == reflect.Ptr {
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v = p.Elem()
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}
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val := v.Interface()
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if !reflect.DeepEqual(val, test.out) {
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t.Errorf("%s scanning %q: expected %#v got %#v, type %T", name, test.text, test.out, val, val)
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}
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}
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}
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func TestScan(t *testing.T) {
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testScan("StringReader", t, Fscan)
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}
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func TestMyReaderScan(t *testing.T) {
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testScan("myStringReader", t, Fscan)
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}
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func TestScanln(t *testing.T) {
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testScan("StringReader", t, Fscanln)
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}
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func TestMyReaderScanln(t *testing.T) {
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testScan("myStringReader", t, Fscanln)
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}
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func TestScanf(t *testing.T) {
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for _, test := range scanfTests {
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n, err := Sscanf(test.text, test.format, test.in)
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if err != nil {
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t.Errorf("got error scanning (%q, %q): %s", test.format, test.text, err)
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continue
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}
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if n != 1 {
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t.Errorf("count error on entry (%q, %q): got %d", test.format, test.text, n)
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continue
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}
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// The incoming value may be a pointer
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v := reflect.ValueOf(test.in)
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if p := v; p.Kind() == reflect.Ptr {
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v = p.Elem()
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}
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val := v.Interface()
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if !reflect.DeepEqual(val, test.out) {
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t.Errorf("scanning (%q, %q): expected %#v got %#v, type %T", test.format, test.text, test.out, val, val)
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}
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}
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}
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|
||
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)
|
||
}
|
||
}
|
||
|
||
// 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
|
||
}
|
||
|
||
// Verify 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)
|
||
}
|
||
}
|
||
|
||
// Verify 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)
|
||
}
|
||
}
|
||
}
|
||
|
||
// Verify 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
|
||
|
||
// Attempt 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)
|
||
}
|
||
|
||
// Test 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)
|
||
}
|
||
}
|
||
|
||
// 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
|
||
}
|
||
|
||
// Perform 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()
|
||
}
|
||
}
|