Hojun-Cho
1ac1d985f6
Sweeping rename so the lib/ surface mirrors Hare's stdlib spellings. - ascii: rune-taking predicates; ishex -> isxdigit - bufio: rinit -> init; take1/takeline -> readbyte/readline - bytes: indexsub -> index - encoding/utf8: runelen -> runesz - errors: eEOF/eShortRead/... -> eof/underread/... - fmt: errln -> errorln; println/fprintln return i64 - os: readfull/writefull -> readall/writeall; unlink -> remove - path: isabs -> abs; drop lastindex (now strings.rbyteindex) - strconv: u64toa/i64toa -> u64tos/i64tos; parse64/parseu64 -> stoi64/stou64 - strings: drop len/isempty; equal -> compare; indexbyte -> byteindex; +rbyteindex - types: drop numeric helpers (moved to math) - new lib/endian (htonu16/ntohu16), lib/math (absi32/absi64) - net: drop htons (use endian.htonu16) Callers in selfhost/, lib/ww/, cmd/w6c/cgen.c, and test/wcc/700_e2e.c updated to match.
106 lines
2.7 KiB
Plaintext
106 lines
2.7 KiB
Plaintext
// strings — operations over the immutable str type ({ *u8, len }).
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// Mirrors Hare's strings::; `len` and `is-empty` aren't functions
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// (callers use `s.len` and `s.len == 0` directly).
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use os;
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// compare — bytewise three-way comparison: negative if a<b, 0 if equal,
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// positive if a>b. Matches Hare's strings::compare. ASCII-order, not
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// locale-aware. Callers that just need equality use `compare(a, b) == 0`.
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export fn compare(a: str, b: str) i32 = {
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let n: i32 = a.len;
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if (b.len < n) { n = b.len; };
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let i: i32 = 0;
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for (i < n) {
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if (a[i] != b[i]) { return (a[i]: i32) - (b[i]: i32); };
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i += 1;
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};
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return a.len - b.len;
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};
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export fn hasprefix(s: str, p: str) bool = {
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if (p.len > s.len) { return false; };
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let i: i32 = 0;
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for (i < p.len) {
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if (s[i] != p[i]) { return false; };
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i += 1;
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};
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return true;
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};
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export fn hassuffix(s: str, suf: str) bool = {
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if (suf.len > s.len) { return false; };
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let off: i32 = s.len - suf.len;
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let i: i32 = 0;
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for (i < suf.len) {
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if (s[off + i] != suf[i]) { return false; };
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i += 1;
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};
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return true;
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};
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// byteindex — first index of byte `c` in `s`, or -1 if absent. Hare
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// name (strings::byteindex). Plan 9-style sentinel return; callers that
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// prefer a fallible shape can wrap this in their own (i32 | str). No
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// allocation.
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export fn byteindex(s: str, c: u8) i32 = {
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let i: i32 = 0;
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for (i < s.len) {
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if (s[i] == c) { return i; };
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i += 1;
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};
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return -1;
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};
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// rbyteindex — last index of byte `c` in `s`, or -1 if absent. Mirrors
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// Hare's strings::rbyteindex.
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export fn rbyteindex(s: str, c: u8) i32 = {
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let i: i32 = s.len - 1;
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for (i >= 0) {
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if (s[i] == c) { return i; };
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i -= 1;
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};
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return -1;
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};
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// index — first index of `sub` in `s`, or -1. Naive scan; fine for
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// short patterns and small strings, which dominate config and CLI
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// parsing. Empty `sub` matches at 0.
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export fn index(s: str, sub: str) i32 = {
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if (sub.len == 0) { return 0; };
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if (sub.len > s.len) { return -1; };
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let last: i32 = s.len - sub.len;
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let i: i32 = 0;
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for (i <= last) {
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let j: i32 = 0;
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let ok: bool = true;
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for (j < sub.len) {
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if (s[i + j] != sub[j]) { ok = false; j = sub.len; }
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else { j += 1; };
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};
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if (ok) { return i; };
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i += 1;
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};
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return -1;
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};
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export fn contains(s: str, sub: str) bool = {
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return index(s, sub) >= 0;
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};
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// concat — joins two strings into a fresh str. Caller owns the
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// returned str's storage; release via `os.free(r.ptr, r.len)`. Mirrors
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// Hare's strings::concat shape.
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export fn concat(a: str, b: str) str = {
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let total: i32 = a.len + b.len;
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let buf: *u8 = os.alloc(total: u64): *u8;
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let i: i32 = 0;
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for (i < a.len) { buf[i] = a[i]; i += 1; };
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let j: i32 = 0;
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for (j < b.len) { buf[a.len + j] = b[j]; j += 1; };
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let r: str;
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r.ptr = buf;
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r.len = total;
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return r;
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};
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