242 lines
6.8 KiB
Plaintext
242 lines
6.8 KiB
Plaintext
// Expect retcode = 0
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// 数值/布尔格式化，写入 ByteBuffer。radix 取值 2..36；uppercase 只影响 10..35 的字母形式。
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// 不分配额外内存（除目标 ByteBuffer 自身扩容），失败不产生部分输出。
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type .{ .Error, .Status, .make } = @import("error.spl");
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type .{ .ByteBuffer } = @import("byte_buffer.spl");
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type .{ .digit_char } = @import("ascii.spl");
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// 注意：radix 边界直接用字面量。stage1 刻意不做常量求值/折叠，
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// 顶层 const 不应用于运行时表达式。
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fn valid_radix(radix: u8): bool {
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ret radix >= 2 && radix <= 36;
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}
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fn append_u64(out: *ByteBuffer, value: u64, radix: u8, uppercase: bool): Status {
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if !valid_radix(radix) { ret .Err(make(.InvalidArgument)); }
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var digits: [64]u8 = undefined;
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var count: usize = 0;
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if value == 0 {
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digits[0] = 48;
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count = 1;
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} else {
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var v = value;
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var base = radix as u64;
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while v != 0 {
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var d = (v % base) as u8;
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match digit_char(d, uppercase) {
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.Ok(c) => { digits[count] = c; },
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.Err(error) => { ret .Err(error); },
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}
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count = count + 1;
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v = v / base;
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}
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}
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// digits 是低位在前，反向写入得到正常顺序。
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var i = count;
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while i > 0 {
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i = i - 1;
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match ByteBuffer.append_byte(out, digits[i]) {
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.Ok => {},
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.Err(error) => { ret .Err(error); },
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}
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}
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ret .Ok;
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}
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fn append_i64(out: *ByteBuffer, value: i64, radix: u8, uppercase: bool): Status {
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if !valid_radix(radix) { ret .Err(make(.InvalidArgument)); }
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if value < 0 {
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match ByteBuffer.append_byte(out, 45) { // '-'
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.Ok => {},
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.Err(error) => { ret .Err(error); },
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}
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// value 为补码，(0 - (value as u64)) 得到绝对值（含 i64 最小值）。
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var magnitude = 0 - (value as u64);
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ret append_u64(out, magnitude, radix, uppercase);
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}
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ret append_u64(out, value as u64, radix, uppercase);
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}
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fn append_usize(out: *ByteBuffer, value: usize, radix: u8, uppercase: bool): Status {
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ret append_u64(out, value as u64, radix, uppercase);
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}
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fn append_isize(out: *ByteBuffer, value: isize, radix: u8, uppercase: bool): Status {
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ret append_i64(out, value as i64, radix, uppercase);
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}
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fn append_bool(out: *ByteBuffer, value: bool): Status {
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if value { ret ByteBuffer.append(out, "true"); }
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ret ByteBuffer.append(out, "false");
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}
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// ---- 测试辅助 ----
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fn expect_ok(result: Status) {
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match result {
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.Ok => {},
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.Err(error) => { @assert(false, "unexpected fmt error"); },
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}
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}
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fn expect_invalid(result: Status) {
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match result {
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.Ok => { @assert(false, "expected fmt error"); },
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.Err(error) => {
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match error.kind {
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.InvalidArgument => {},
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_ => { @assert(false, "unexpected fmt error kind"); },
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}
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},
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}
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}
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fn expect_text(buffer: *ByteBuffer, expected: []u8) {
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var actual = ByteBuffer.as_slice(buffer.*);
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@assert(actual.len == expected.len, "formatted length");
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var i: usize = 0;
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while i < expected.len {
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@assert(actual.ptr[i] == expected.ptr[i], "formatted byte");
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i = i + 1;
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}
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}
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fn test_unsigned() {
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var b = ByteBuffer.new();
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expect_ok(append_u64(&b, 0, 10, false));
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expect_text(&b, "0");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 42, 10, false));
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expect_text(&b, "42");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 1234567890, 10, false));
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expect_text(&b, "1234567890");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 18446744073709551615, 10, false));
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expect_text(&b, "18446744073709551615");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 255, 16, false));
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expect_text(&b, "ff");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 255, 16, true));
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expect_text(&b, "FF");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 4096, 16, false));
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expect_text(&b, "1000");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 170, 2, false));
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expect_text(&b, "10101010");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 35, 36, false));
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expect_text(&b, "z");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 18446744073709551615, 2, false));
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expect_text(&b, "1111111111111111111111111111111111111111111111111111111111111111");
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ByteBuffer.clear(&b);
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ByteBuffer.drop(&b);
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}
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fn test_signed() {
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var b = ByteBuffer.new();
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expect_ok(append_i64(&b, 0, 10, false));
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expect_text(&b, "0");
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ByteBuffer.clear(&b);
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expect_ok(append_i64(&b, -123, 10, false));
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expect_text(&b, "-123");
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ByteBuffer.clear(&b);
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expect_ok(append_i64(&b, 9223372036854775807, 10, false));
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expect_text(&b, "9223372036854775807");
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ByteBuffer.clear(&b);
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expect_ok(append_i64(&b, -9223372036854775808, 10, false));
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expect_text(&b, "-9223372036854775808");
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ByteBuffer.clear(&b);
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expect_ok(append_isize(&b, -16, 16, false));
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expect_text(&b, "-10");
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ByteBuffer.clear(&b);
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expect_ok(append_u64(&b, 48879, 16, true));
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expect_text(&b, "BEEF");
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ByteBuffer.clear(&b);
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ByteBuffer.drop(&b);
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}
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fn test_usize_bool_and_errors() {
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var b = ByteBuffer.new();
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expect_ok(append_usize(&b, 1000 as usize, 10, false));
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expect_text(&b, "1000");
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ByteBuffer.clear(&b);
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expect_ok(append_bool(&b, true));
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expect_text(&b, "true");
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ByteBuffer.clear(&b);
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expect_ok(append_bool(&b, false));
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expect_text(&b, "false");
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ByteBuffer.clear(&b);
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expect_invalid(append_u64(&b, 1, 0, false));
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expect_invalid(append_u64(&b, 1, 1, false));
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expect_invalid(append_u64(&b, 1, 37, false));
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expect_invalid(append_i64(&b, -1, 0, false));
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@assert(ByteBuffer.size(b) == 0, "invalid radix writes nothing");
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ByteBuffer.drop(&b);
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}
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fn test_composition_and_growth() {
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var b = ByteBuffer.new();
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expect_ok(ByteBuffer.append(&b, "x="));
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expect_ok(append_i64(&b, -42, 10, false));
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expect_ok(ByteBuffer.append(&b, " hex="));
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expect_ok(append_u64(&b, 255, 16, false));
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expect_ok(ByteBuffer.append(&b, " ok="));
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expect_ok(append_bool(&b, true));
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expect_text(&b, "x=-42 hex=ff ok=true");
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ByteBuffer.clear(&b);
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// 反复写入触发 ByteBuffer 扩容，校验累积内容。
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var i: i32 = 0;
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while i < 200 {
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expect_ok(append_i64(&b, i as i64, 10, false));
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expect_ok(ByteBuffer.append_byte(&b, 44)); // ','
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i = i + 1;
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}
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expect_ok(append_i64(&b, 200, 10, false));
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@assert(ByteBuffer.size(b) > 0, "growth content");
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var s = ByteBuffer.as_slice(b);
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@assert(s.ptr[0] == 48, "starts with 0");
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@assert(s.ptr[1] == 44, "0 then comma");
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ByteBuffer.drop(&b);
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}
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fn main() {
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test_unsigned();
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test_signed();
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test_usize_bool_and_errors();
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test_composition_and_growth();
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}
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