// strio_getline
private IRubyObject getline(ThreadContext context, IRubyObject[] args) {
Ruby runtime = context.runtime;
IRubyObject str = context.nil;
;
int n, limit = -1;
switch (args.length) {
case 0:
str = runtime.getGlobalVariables().get("$/");
break;
case 1:
{
str = args[0];
if (!str.isNil() && !(str instanceof RubyString)) {
IRubyObject tmp = str.checkStringType19();
if (tmp.isNil()) {
limit = RubyNumeric.num2int(str);
if (limit == 0) return runtime.newString();
str = runtime.getGlobalVariables().get("$/");
} else {
str = tmp;
}
}
break;
}
case 2:
if (!args[0].isNil()) str = args[0].convertToString();
// 2.0 ignores double nil, 1.9 raises
if (runtime.is2_0()) {
if (!args[1].isNil()) {
limit = RubyNumeric.num2int(args[1]);
}
} else {
limit = RubyNumeric.num2int(args[1]);
}
break;
}
if (isEndOfString()) {
return context.nil;
}
ByteList dataByteList = ptr.string.getByteList();
byte[] dataBytes = dataByteList.getUnsafeBytes();
int begin = dataByteList.getBegin();
int s = begin + ptr.pos;
int e = begin + dataByteList.getRealSize();
int p;
if (limit > 0 && s + limit < e) {
e = dataByteList.getEncoding().rightAdjustCharHead(dataBytes, s, s + limit, e);
}
if (str.isNil()) {
str = strioSubstr(runtime, ptr.pos, e - s);
} else if ((n = ((RubyString) str).size()) == 0) {
// this is not an exact port; the original confused me
p = s;
// remove leading \n
while (dataBytes[p] == '\n') {
if (++p == e) {
return context.nil;
}
}
s = p;
// find next \n or end; if followed by \n, include it too
p = memchr(dataBytes, p, '\n', e - p);
if (p != -1) {
if (++p < e && dataBytes[p] == '\n') {
e = p + 1;
} else {
e = p;
}
}
str = strioSubstr(runtime, s - begin, e - s);
} else if (n == 1) {
RubyString strStr = (RubyString) str;
ByteList strByteList = strStr.getByteList();
if ((p = memchr(dataBytes, s, strByteList.get(0), e - s)) != -1) {
e = p + 1;
}
str = strioSubstr(runtime, ptr.pos, e - s);
} else {
if (n < e - s) {
RubyString strStr = (RubyString) str;
ByteList strByteList = strStr.getByteList();
byte[] strBytes = strByteList.getUnsafeBytes();
int[] skip = new int[1 << CHAR_BIT];
int pos;
p = strByteList.getBegin();
bm_init_skip(skip, strBytes, p, n);
if ((pos = bm_search(strBytes, p, n, dataBytes, s, e - s, skip)) >= 0) {
e = s + pos + n;
}
}
str = strioSubstr(runtime, ptr.pos, e - s);
}
ptr.pos = e - begin;
ptr.lineno++;
return str;
}
private static void blockPostTrace(
Ruby runtime, ThreadContext context, String name, RubyModule implClass) {
if (runtime.hasEventHooks() && runtime.is2_0())
context.trace(RubyEvent.B_RETURN, name, implClass);
}