reiver
/
go-rfc8259
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

initial commits

master
Charles Iliya Krempeaux 2023-11-04 22:52:10 -07:00
parent 2bb703cc30
commit fe4aafd2ce
3 changed files with 445 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
naturalnumber/naturalnumber.go 100644
View File

@ -0,0 +1,64 @@
package rfc8259naturalnumber
import (
"fmt"
"sourcecode.social/reiver/go-opt"
)
// NaturalNumber represents the numbers:
// ..., -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7,....
//
// I.e., the set of positive-integers, negative-integers, and zero.
//
// From IETF RFC-8259 NaturalNumber represents the following:
//
// [ minus ] int
//
// This is part of the definition of:
//
// number = [ minus ] int [ frac ] [ exp ]
//
// Since a NaturalNumber is a common usage of a JSON number, NaturalNumber exists.
type NaturalNumber struct {
opt.Optional[string]
}
func Nothing() NaturalNumber {
return NaturalNumber{opt.Nothing[string]()}
}
func NegativeOne() NaturalNumber {
return Something("-1")
}
func Zero() NaturalNumber {
return Something("0")
}
func One() NaturalNumber {
return Something("1")
}
func Something(value string) NaturalNumber {
return NaturalNumber{opt.Something(value)}
}
func (receiver NaturalNumber) GoString() string {
switch receiver {
case Nothing():
return "rfc8259naturalnumber.Nothing()"
case NegativeOne():
return "rfc8259naturalnumber.NegativeOne()"
case Zero():
return "rfc8259naturalnumber.Zero()"
case One():
return "rfc8259naturalnumber.One()"
default:
value, found := receiver.Get()
if !found {
return fmt.Sprintf("--INTERNAL-ERROR--")
}
return fmt.Sprintf("rfc8259naturalnumber.Something(%#v)", value)
}
}

91
naturalnumber/parse.go 100644
View File

@ -0,0 +1,91 @@
package rfc8259naturalnumber
import (
"io"
"sourcecode.social/reiver/go-opt"
"sourcecode.social/reiver/go-rfc8259/errors"
"sourcecode.social/reiver/go-rfc8259/wholenumber"
)
// Parse tries to parse a JSON natural-number literal.
// If it succeeds, then it return nil, and sets ‘dst’ to the parsed value.
// If it failed, it returns an error.
//
// Example usage:
//
// var rs io.RuneScaner
//
// // ...
//
// var value rfc8259naturalnumber.NaturalNumber
// err := rfc8259naturalnumber.Parse(rs, &value)
//
// if nil != err {
// return err
// }
//
// fmt.Printf("value = %#v\n", value)
func Parse(runescanner io.RuneScanner, dst *NaturalNumber) error {
if nil == runescanner {
return rfc8259errors.ErrNilRuneScanner
}
if nil == dst {
return rfc8259errors.ErrNilDestination
}
var r rune
{
var err error
r, _, err = runescanner.ReadRune()
if nil != err {
if io.EOF == err {
return rfc8259errors.ErrUnexpectedEndOfFile
}
return rfc8259errors.ErrProblemReadingRune(err)
}
}
var minusPart opt.Optional[rune]
var intPart rfc8259wholenumber.WholeNumber
switch r {
case '-':
minusPart = opt.Something(r)
default:
if err := runescanner.UnreadRune(); nil != err {
return rfc8259errors.ErrProblemUnreadingRune(err, r)
}
}
err := rfc8259wholenumber.Parse(runescanner, &intPart)
if nil != err {
return err
}
var value string
{
var buffer [256]byte
var p []byte = buffer[0:0]
minusPart.WhenSomething(func(value rune){
p = append(p, string(value)...)
})
intPart.WhenSomething(func(value string){
p = append(p, value...)
})
if len(p) < 1 {
}
value = string(p)
}
*dst = Something(value)
return nil
}

290
naturalnumber/parse_test.go 100644
View File

@ -0,0 +1,290 @@
package rfc8259naturalnumber_test
import (
"testing"
"bytes"
"io"
"sourcecode.social/reiver/go-utf8"
"sourcecode.social/reiver/go-rfc8259/naturalnumber"
)
func TestParse_success(t *testing.T) {
tests := []struct{
Value []byte
Expected rfc8259naturalnumber.NaturalNumber
}{
{
Value: []byte("0"),
Expected: rfc8259naturalnumber.Zero(),
},
{
Value: []byte("1"),
Expected: rfc8259naturalnumber.One(),
},
{
Value: []byte("-1"),
Expected: rfc8259naturalnumber.NegativeOne(),
},
{
Value: []byte("2"),
Expected: rfc8259naturalnumber.Something("2"),
},
{
Value: []byte("-2"),
Expected: rfc8259naturalnumber.Something("-2"),
},
{
Value: []byte("3"),
Expected: rfc8259naturalnumber.Something("3"),
},
{
Value: []byte("-3"),
Expected: rfc8259naturalnumber.Something("-3"),
},
{
Value: []byte("13"),
Expected: rfc8259naturalnumber.Something("13"),
},
{
Value: []byte("-13"),
Expected: rfc8259naturalnumber.Something("-13"),
},
{
Value: []byte("13256278887989457651018865901401704640"),
Expected: rfc8259naturalnumber.Something("13256278887989457651018865901401704640"),
},
{
Value: []byte("-13256278887989457651018865901401704640"),
Expected: rfc8259naturalnumber.Something("-13256278887989457651018865901401704640"),
},
{
Value: []byte("123.45"),
Expected: rfc8259naturalnumber.Something("123"),
},
{
Value: []byte("123 "),
Expected: rfc8259naturalnumber.Something("123"),
},
{
Value: []byte("123,"),
Expected: rfc8259naturalnumber.Something("123"),
},
{
Value: []byte("123e"),
Expected: rfc8259naturalnumber.Something("123"),
},
{
Value: []byte("123E"),
Expected: rfc8259naturalnumber.Something("123"),
},
{
Value: []byte("-123.45"),
Expected: rfc8259naturalnumber.Something("-123"),
},
{
Value: []byte("-123 "),
Expected: rfc8259naturalnumber.Something("-123"),
},
{
Value: []byte("-123,"),
Expected: rfc8259naturalnumber.Something("-123"),
},
{
Value: []byte("-123e"),
Expected: rfc8259naturalnumber.Something("-123"),
},
{
Value: []byte("-123E"),
Expected: rfc8259naturalnumber.Something("-123"),
},
}
for testNumber, test := range tests {
var reader io.Reader = bytes.NewReader(test.Value)
var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
var actual rfc8259naturalnumber.NaturalNumber
err := rfc8259naturalnumber.Parse(runescanner, &actual)
if nil != err {
t.Errorf("For test #%d, did not expect an error but actually got one.", testNumber)
t.Logf("ERROR: (%T) %s", err, err)
t.Logf("VALUE: %q", test.Value)
t.Logf("VALUE: %#v", test.Value)
continue
}
{
expected := test.Expected
if expected != actual {
t.Errorf("For test #%d, the actual value is not what was expected." , testNumber)
t.Logf("EXPECTED: %#v", expected)
t.Logf("ACTUAL: %#v", actual)
t.Logf("VALUE: %q", test.Value)
t.Logf("VALUE: %#v", test.Value)
continue
}
}
}
}
func TestParse_failure(t *testing.T) {
tests := []struct{
Value []byte
ExpectedError string
}{
{
Value: []byte(nil),
ExpectedError: "rfc8259: unexpected end-of-file",
},
{
Value: []byte(""),
ExpectedError: "rfc8259: unexpected end-of-file",
},
{
Value: []byte("-"),
ExpectedError: "rfc8259: unexpected end-of-file",
},
{
Value: []byte("\t"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was '\t' (U+0009)`,
},
{
Value: []byte("\n"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was '\n' (U+000A)`,
},
{
Value: []byte("\r"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was '\r' (U+000D)`,
},
{
Value: []byte(" "),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was ' ' (U+0020)`,
},
{
Value: []byte("\""),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was '"' (U+0022)`,
},
{
Value: []byte("f"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was 'f' (U+0066)`,
},
{
Value: []byte("n"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was 'n' (U+006E)`,
},
{
Value: []byte("t"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was 't' (U+0074)`,
},
{
Value: []byte("\"name\""),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was '"' (U+0022)`,
},
{
Value: []byte("apple"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was 'a' (U+0061)`,
},
{
Value: []byte("banana"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was 'b' (U+0062)`,
},
{
Value: []byte("cherry"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was 'c' (U+0063)`,
},
{
Value: []byte("ONCE TWICE THRICE FOURCE"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was 'O' (U+004F)`,
},
{
Value: []byte("😈"),
ExpectedError: `rfc8259: JSON parser encountered a problem — when trying to parse a whole-number, expected the first character to be '0', '1', '2', '3', '4', '5', '6', '7', '8', ot '9', but actually was '😈' (U+1F608)`,
},
}
for testNumber, test := range tests {
var reader io.Reader = bytes.NewReader(test.Value)
var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
var actual rfc8259naturalnumber.NaturalNumber
err := rfc8259naturalnumber.Parse(runescanner, &actual)
if nil == err {
t.Errorf("For test #%d, expected an error but did not actually get one.", testNumber)
t.Logf("VALUE: %q", test.Value)
t.Logf("VALUE: %#v", test.Value)
continue
}
{
expected := rfc8259naturalnumber.Nothing()
if expected != actual {
t.Errorf("For test #%d, the actual value is not what was expected." , testNumber)
t.Logf("EXPECTED: %#v", expected)
t.Logf("ACTUAL: %#v", actual)
t.Logf("VALUE: %q", test.Value)
t.Logf("VALUE: %#v", test.Value)
continue
}
}
{
expected := test.ExpectedError
actual := err.Error()
if expected != actual {
t.Errorf("For test #%d, the actual value is not what was expected." , testNumber)
t.Logf("EXPECTED: %#v", expected)
t.Logf("ACTUAL: %#v", actual)
t.Logf("VALUE: %q", test.Value)
t.Logf("VALUE: %#v", test.Value)
continue
}
}
}
}