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#pragma once
#include <util/generic/strbuf.h>
#include <util/stream/input.h>
namespace NJson {
struct TReadOnlyStreamBase {
using Ch = char;
Ch* PutBegin() {
Y_ASSERT(false);
return nullptr;
}
void Put(Ch) {
Y_ASSERT(false);
}
void Flush() {
Y_ASSERT(false);
}
size_t PutEnd(Ch*) {
Y_ASSERT(false);
return 0;
}
};
struct TInputStreamWrapper : TReadOnlyStreamBase {
Ch Peek() const {
if (!Eof) {
if (Pos >= Sz) {
if (Sz < BUF_SIZE) {
Sz += Helper.Read(Buf + Sz, BUF_SIZE - Sz);
} else {
Sz = Helper.Read(Buf, BUF_SIZE);
Pos = 0;
}
}
if (Pos < Sz) {
return Buf[Pos];
}
}
Eof = true;
return 0;
}
Ch Take() {
auto c = Peek();
++Pos;
++Count;
return c;
}
size_t Tell() const {
return Count;
}
TInputStreamWrapper(IInputStream& helper)
: Helper(helper)
, Eof(false)
, Sz(0)
, Pos(0)
, Count(0)
{
}
static const size_t BUF_SIZE = 1 << 12;
IInputStream& Helper;
mutable char Buf[BUF_SIZE];
mutable bool Eof;
mutable size_t Sz;
mutable size_t Pos;
size_t Count;
};
struct TStringBufStreamWrapper : TReadOnlyStreamBase {
Ch Peek() const {
return Pos < Data.size() ? Data[Pos] : 0;
}
Ch Take() {
auto c = Peek();
++Pos;
return c;
}
size_t Tell() const {
return Pos;
}
TStringBufStreamWrapper(TStringBuf data)
: Data(data)
, Pos(0)
{
}
TStringBuf Data;
size_t Pos;
};
}
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