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|
module io
struct Buf {
pub:
bytes []byte
mut:
i int
}
fn (mut b Buf) read(mut buf []byte) ?int {
if !(b.i < b.bytes.len) {
return none
}
n := copy(buf, b.bytes[b.i..])
b.i += n
return n
}
fn test_read_all() {
buf := Buf{
bytes: '123'.repeat(10).bytes()
}
res := read_all(reader: buf) or {
assert false
''.bytes()
}
assert res == '123'.repeat(10).bytes()
}
fn test_read_all_huge() {
buf := Buf{
bytes: '123'.repeat(100000).bytes()
}
res := read_all(reader: buf) or {
assert false
''.bytes()
}
assert res == '123'.repeat(100000).bytes()
}
struct StringReader {
text string
mut:
place int
}
fn (mut s StringReader) read(mut buf []byte) ?int {
if s.place >= s.text.len {
return none
}
read := copy(buf, s.text[s.place..].bytes())
s.place += read
return read
}
const (
newline_count = 100000
)
fn test_stringreader() {
text := '12345\n'.repeat(io.newline_count)
mut s := StringReader{
text: text
}
mut r := new_buffered_reader(reader: s)
for i := 0; true; i++ {
if _ := r.read_line() {
} else {
assert i == io.newline_count
break
}
}
if _ := r.read_line() {
assert false
}
leftover := read_all(reader: r) or {
assert false
panic('bad')
}
if leftover.len > 0 {
assert false
}
}
fn test_stringreader2() {
text := '12345\r\n'.repeat(io.newline_count)
mut s := StringReader{
text: text
}
mut r := new_buffered_reader(reader: s)
for i := 0; true; i++ {
if _ := r.read_line() {
} else {
assert i == io.newline_count
break
}
}
if _ := r.read_line() {
assert false
}
leftover := read_all(reader: r) or {
assert false
panic('bad')
}
if leftover.len > 0 {
assert false
}
}
fn test_leftover() {
text := 'This is a test\r\nNice try!'
mut s := StringReader{
text: text
}
mut r := new_buffered_reader(reader: s)
_ := r.read_line() or {
assert false
panic('bad')
}
line2 := r.read_line() or {
assert false
panic('bad')
}
assert line2 == 'Nice try!'
if _ := r.read_line() {
assert false
panic('bad')
}
assert r.end_of_stream()
}
|
