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use core:io;
// Helper to make a string into lowercase (only considering ASCII). Modifies 'src'.
Str toAsciiLowercase(Buffer src) {
Nat c = src.filled;
for (Nat i = 0; i < c; i++) {
Byte ch = src[i];
if (ch >= 0x41 & ch <= 0x5A)
src[i] = ch + 0x20;
}
return src.fromUtf8();
}
Str toAsciiLowercase(Str src) {
Bool change = false;
for (ch in src) {
Nat code = ch.codepoint;
if (code >= 0x41 & code <= 0x5A) {
change = true;
break;
}
}
// It was lowercase already!
if (!change)
return src;
StrBuf changed;
for (ch in src) {
Nat code = ch.codepoint;
if (code >= 0x41 & code <= 0x5A) {
changed << Char(code + 0x20);
} else {
changed << ch;
}
}
return changed.toS;
}
// Helper to compare two strings without ASCII case-sensitivity.
Bool noCaseEqual(Str a, Str b) {
var ia = a.begin();
var ib = b.begin();
var ea = a.end();
var eb = b.end();
while (ia != ea & ib != eb) {
Nat codeA = ia.v.codepoint;
Nat codeB = ib.v.codepoint;
if (codeA >= 0x41 & codeA <= 0x5A)
codeA += 0x20;
if (codeB >= 0x41 & codeB <= 0x5A)
codeB += 0x20;
if (codeA != codeB)
return false;
++ia;
++ib;
}
return (ia == ea) & (ib == eb);
}
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