mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
334 lines
7.0 KiB
V
334 lines
7.0 KiB
V
import bitfield
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import rand
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fn test_bf_new_size() {
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instance := bitfield.new(75)
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assert instance.get_size() == 75
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}
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fn test_bf_set_clear_toggle_get() {
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mut instance := bitfield.new(75)
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instance.set_bit(47)
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assert instance.get_bit(47) == 1
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instance.clear_bit(47)
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assert instance.get_bit(47) == 0
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instance.toggle_bit(47)
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assert instance.get_bit(47) == 1
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}
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fn test_bf_insert_extract() {
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mut instance := bitfield.new(11)
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instance.set_all()
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instance.insert(2, 9, 3)
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assert instance.extract(2, 1) == 0
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assert instance.extract(2, 8) == 1
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assert instance.extract(10, 1) == 1
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instance.set_all()
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instance.insert_lowest_bits_first(2, 9, 3)
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assert instance.extract_lowest_bits_first(2, 1) == 1
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assert instance.extract_lowest_bits_first(2, 8) == 3
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assert instance.extract_lowest_bits_first(10, 1) == 0
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}
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fn test_bf_and_not_or_xor() {
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len := 80
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mut input1 := bitfield.new(len)
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mut input2 := bitfield.new(len)
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mut i := 0
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for i < len {
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if rand.intn(2) or { 0 } == 1 {
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input1.set_bit(i)
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}
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if rand.intn(2) or { 0 } == 1 {
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input2.set_bit(i)
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}
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i++
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}
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output1 := bitfield.bf_xor(input1, input2)
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bf_and := bitfield.bf_and(input1, input2)
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bf_or := bitfield.bf_or(input1, input2)
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bf_not := bitfield.bf_not(bf_and)
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output2 := bitfield.bf_and(bf_or, bf_not)
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mut result := 1
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for i < len {
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if output1.get_bit(i) != output2.get_bit(i) {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_clone_cmp() {
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len := 80
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mut input := bitfield.new(len)
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for i in 0 .. len {
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if rand.intn(2) or { 0 } == 1 {
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input.set_bit(i)
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}
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}
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output := input.clone()
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assert output.get_size() == len
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assert input == output
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}
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fn test_slice_join() {
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len := 80
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mut input := bitfield.new(len)
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for i in 0 .. len {
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if rand.intn(2) or { 0 } == 1 {
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input.set_bit(i)
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}
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}
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mut result := 1
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for point := 1; point < (len - 1); point++ {
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// divide a bitfield into two subfields
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chunk1 := input.slice(0, point)
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chunk2 := input.slice(point, input.get_size())
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// concatenate them back into one and compare to the original
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output := bitfield.join(chunk1, chunk2)
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if input != output {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_pop_count() {
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len := 80
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mut count0 := 0
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mut input := bitfield.new(len)
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for i in 0 .. len {
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if rand.intn(2) or { 0 } == 1 {
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input.set_bit(i)
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count0++
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}
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}
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count1 := input.pop_count()
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assert count0 == count1
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}
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fn test_hamming() {
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len := 80
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mut count := 0
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mut input1 := bitfield.new(len)
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mut input2 := bitfield.new(len)
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for i in 0 .. len {
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match rand.intn(4) or { 0 } {
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0, 1 {
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input1.set_bit(i)
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count++
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}
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2 {
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input2.set_bit(i)
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count++
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}
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3 {
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input1.set_bit(i)
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input2.set_bit(i)
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}
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else {}
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}
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}
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assert count == bitfield.hamming(input1, input2)
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}
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fn test_bf_from_bytes() {
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input := [u8(0x01), 0xF0, 0x0F, 0xF0, 0xFF]
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output := bitfield.from_bytes(input).str()
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assert output == '00000001' + '11110000' + '00001111' + '11110000' + '11111111'
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newoutput := bitfield.from_str(output).str()
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assert newoutput == output
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}
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fn test_bf_from_bytes_lowest_bits_first() {
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input := [u8(0x01), 0xF0]
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output := bitfield.from_bytes_lowest_bits_first(input).str()
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assert output == '10000000' + '00001111'
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newoutput := bitfield.from_str(output).str()
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assert newoutput == output
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}
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fn test_bf_from_str() {
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len := 80
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mut input := ''
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for _ in 0 .. len {
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if rand.intn(2) or { 0 } == 1 {
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input = input + '1'
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} else {
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input = input + '0'
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}
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}
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output := bitfield.from_str(input)
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mut result := 1
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for i in 0 .. len {
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if input[i] != u8(output.get_bit(i)) + 48 {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_bf_bf2str() {
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len := 80
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mut input := bitfield.new(len)
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for i in 0 .. len {
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if rand.intn(2) or { 0 } == 1 {
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input.set_bit(i)
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}
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}
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mut check := ''
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for i in 0 .. len {
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if input.get_bit(i) == 1 {
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check = check + '1'
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} else {
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check = check + '0'
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}
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}
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output := input.str()
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mut result := 1
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for i in 0 .. len {
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if check[i] != output[i] {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_bf_set_all() {
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len := 80
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mut input := bitfield.new(len)
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input.set_all()
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mut result := 1
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for i in 0 .. len {
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if input.get_bit(i) != 1 {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_bf_clear_all() {
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len := 80
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mut input := bitfield.new(len)
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for i in 0 .. len {
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if rand.intn(2) or { 0 } == 1 {
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input.set_bit(i)
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}
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}
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input.clear_all()
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mut result := 1
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for i in 0 .. len {
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if input.get_bit(i) != 0 {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_bf_reverse() {
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len := 80
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mut input := bitfield.new(len)
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for i in 0 .. len {
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if rand.intn(2) or { 0 } == 1 {
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input.set_bit(i)
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}
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}
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check := input.clone()
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output := input.reverse()
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mut result := 1
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for i in 0 .. len {
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if output.get_bit(i) != check.get_bit(len - i - 1) {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_bf_resize() {
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len := 80
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mut input := bitfield.new(rand.intn(len) or { 0 } + 1)
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for _ in 0 .. 100 {
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input.resize(rand.intn(len) or { 0 } + 1)
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input.set_bit(input.get_size() - 1)
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}
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assert input.get_bit(input.get_size() - 1) == 1
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}
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fn test_bf_pos() {
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/*
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*
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* set haystack size to 80
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* test different sizes of needle, from 1 to 80
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* test different positions of needle, from 0 to where it fits
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* all haystacks here contain exactly one instanse of needle,
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* so search should return non-negative-values
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*
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*/
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len := 80
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mut result := 1
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for i := 1; i < len; i++ { // needle size
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for j in 0 .. len - i { // needle position in the haystack
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// create the needle
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mut needle := bitfield.new(i)
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// fill the needle with random values
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for k in 0 .. i {
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if rand.intn(2) or { 0 } == 1 {
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needle.set_bit(k)
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}
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}
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// make sure the needle contains at least one set bit, selected randomly
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r := rand.intn(i) or { 0 }
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needle.set_bit(r)
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// create the haystack, make sure it contains the needle
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mut haystack := needle.clone()
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// if there is space between the start of the haystack and the sought needle, fill it with zeroes
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if j > 0 {
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start := bitfield.new(j)
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tmp := bitfield.join(start, haystack)
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haystack = tmp
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}
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// if there is space between the sought needle and the end of haystack, fill it with zeroes
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if j + i < len {
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end := bitfield.new(len - j - i)
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tmp2 := bitfield.join(haystack, end)
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haystack = tmp2
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}
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// now let's test
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// the result should be equal to j
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if haystack.pos(needle) != j {
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result = 0
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}
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}
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}
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assert result == 1
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}
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fn test_bf_rotate() {
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mut result := 1
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len := 80
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for i := 1; i < 80 && result == 1; i++ {
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mut chunk1 := bitfield.new(i)
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chunk2 := bitfield.new(len - i)
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chunk1.set_all()
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input := bitfield.join(chunk1, chunk2)
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output := input.rotate(i)
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if output.get_bit(len - i - 1) != 0 || output.get_bit(len - i) != 1 {
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result = 0
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}
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}
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assert result == 1
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}
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fn test_bf_printing() {
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len := 80
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mut input := bitfield.new(len)
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for i in 0 .. len {
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if rand.intn(2) or { 0 } == 0 {
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input.set_bit(i)
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}
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}
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// the following should convert the bitfield input into a string automatically
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println(input)
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assert true
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}
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