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#include <library/cpp/scheme/scimpl.h>
#include <util/string/cast.h>
#include <util/string/escape.h>
#include <library/cpp/string_utils/relaxed_escaper/relaxed_escaper.h>
#include <util/generic/is_in.h>
#include <util/string/util.h>
namespace NSc {
template <typename TValue, typename TGetter>
struct TSelector {
TValue& Root;
TValue* Current = nullptr;
TValue* Parent = nullptr;
TStringBuf CurrentDictKey;
size_t CurrentArrayKey = 0;
size_t Depth = 0;
bool HasArray = false;
bool HasError = false;
TSelector(TValue& root)
: Root(root)
, Current(&Root)
{}
template <typename T>
bool Next(T k) {
Depth += 1;
Parent = Current;
Current = TGetter::Next(Current, k);
return Current != nullptr;
}
bool NextDict(TStringBuf k) {
return Next(CurrentDictKey = k);
}
bool NextArray(size_t k) {
HasArray = true;
return Next(CurrentArrayKey = k);
}
bool Error() {
Parent = nullptr;
Current = nullptr;
CurrentArrayKey = 0;
CurrentDictKey = TStringBuf();
HasError = true;
return false;
}
};
template <typename TSelector>
struct TSelectorCtx {
TSelector Selector;
TString Buffer;
const char* p0 = nullptr;
const char* p = nullptr;
const char* pe = nullptr;
const char* eof = nullptr;
const char* ts = nullptr;
const char* te = nullptr;
int cs = 0;
int act = 0;
TSelectorCtx(TSelector sel, TStringBuf data)
: Selector(sel)
, p0(data.data())
, p(data.data())
, pe(data.end())
, eof(data.end())
{}
bool OnString(TStringBuf s) {
return Selector.NextDict(s);
}
bool OnInt(size_t k) {
return Selector.NextArray(k);
}
bool OnStrU() {
return OnString(TStringBuf(ts, te));
}
bool OnStrQ() {
return OnString(TStringBuf(ts + 1, te - 1));
}
bool OnStrE() {
Buffer.clear();
Buffer.reserve(te - ts);
UnescapeC(ts + 1, te - ts - 2, Buffer);
return OnString(Buffer);
}
bool OnIntU() {
return OnInt(FromString<ui32>(TStringBuf(ts, te)));
}
bool OnIntQ() {
return OnInt(FromString<ui32>(TStringBuf(ts + 1, te - 1)));
}
bool OnError() {
Selector.Error();
return false;
}
bool SelectPath();
};
#if 0
%%{
machine schemeselect;
alphtype char;
action OnIntU { if (Y_UNLIKELY(!OnIntU())) goto TOKEN_ERROR; }
action OnIntQ { if (Y_UNLIKELY(!OnIntQ())) goto TOKEN_ERROR; }
action OnStrU { if (Y_UNLIKELY(!OnStrU())) goto TOKEN_ERROR; }
action OnStrQ { if (Y_UNLIKELY(!OnStrQ())) goto TOKEN_ERROR; }
action OnStrE { if (Y_UNLIKELY(!OnStrE())) goto TOKEN_ERROR; }
action OnError { goto TOKEN_ERROR; }
intu = [0-9]+;
intq = '[' intu ']';
uchar0 = [a-zA-Z_@$] | (0x80 .. 0xFF);
uchar = uchar0 | digit | [.\-];
qchar = [^'\\]; #';
dchar = [^"\\]; #";
bchar = [^\]\\];
echar = "\\" any;
qechar = qchar | echar;
dechar = dchar | echar;
bechar = bchar | echar;
strq = "'" qchar* "'";
strd = '"' dchar* '"';
strb = '[' bchar* ']';
strqe = "'" qechar* "'";
strde = '"' dechar* '"';
strbe = '[' bechar* ']';
strU = uchar0 uchar*;
strQ = strq | strd | strb;
strE = strqe | strde | strbe;
main := |*
intu => OnIntU;
intq => OnIntQ;
strU => OnStrU;
strQ => OnStrQ;
strE => OnStrE;
'/';
(intu) (any - ('/' | '[' )) => OnError;
any => OnError;
*|;
}%%
#endif
template <typename TSelector>
bool TSelectorCtx<TSelector>::SelectPath() {
try {
%%{
write data noerror nofinal;
write init;
write exec;
}%%
;
Y_UNUSED(schemeselect_en_main);
} catch (const TFromStringException&) {
return OnError();
}
return Selector.Current;
TOKEN_ERROR:
return OnError();
}
template <bool CheckHas>
struct TGetNext {
template <typename TValue, typename TIdx>
static TValue* Next(TValue* val, TIdx idx) {
if (val) {
if (CheckHas && !val->Has(idx)) {
return nullptr;
} else {
return &(*val)[idx];
}
} else {
return nullptr;
}
}
};
const TValue& TValue::TrySelect(TStringBuf path) const {
TSelectorCtx<TSelector<const TValue, TGetNext<true> > > ctx(*this, path);
if (ctx.SelectPath()) {
return *ctx.Selector.Current;
}
return DefaultValue();
}
TValue* TValue::TrySelectOrAdd(TStringBuf path) {
TSelectorCtx<TSelector<TValue, TGetNext<false> > > ctx(*this, path);
if (ctx.SelectPath()) {
return ctx.Selector.Current;
} else {
return nullptr;
}
}
TValue TValue::TrySelectAndDelete(TStringBuf path) {
TSelectorCtx<TSelector<TValue, TGetNext<true> > > ctx(*this, path);
if (ctx.SelectPath() && ctx.Selector.Parent) {
if (ctx.Selector.Parent->IsArray()) {
return ctx.Selector.Parent->Delete(ctx.Selector.CurrentArrayKey);
} else if (ctx.Selector.Parent->IsDict()) {
return ctx.Selector.Parent->Delete(ctx.Selector.CurrentDictKey);
} else {
Y_ASSERT(false);
return DefaultValue();
}
} else {
return DefaultValue();
}
}
bool TValue::PathExists(TStringBuf path) const {
return TSelectorCtx<TSelector<const TValue, TGetNext<true>>>(*this, path).SelectPath();
}
bool TValue::PathValid(TStringBuf path) {
TSelectorCtx<TSelector<const TValue, TGetNext<false>>> ctx(DefaultValue(), path);
return ctx.SelectPath() || !ctx.Selector.HasError;
}
TString TValue::EscapeForPath(TStringBuf rawKey) {
static const str_spn danger{"/[]"};
if (!rawKey || danger.brk(rawKey.begin(), rawKey.end()) != rawKey.end()) {
return NEscJ::EscapeJ<true>(rawKey);
}
TSelectorCtx<TSelector<const TValue, TGetNext<false>>> ctx(DefaultValue(), rawKey);
ctx.SelectPath();
if (ctx.Selector.HasError || ctx.Selector.Depth > 1 || ctx.Selector.HasArray) {
return NEscJ::EscapeJ<true>(rawKey);
} else {
return ToString(rawKey);
}
}
}
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