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winamp/Src/nde/win/Query.cpp
Jef 0954e03b3a Initial community commit
2024-09-24 14:54:57 +02:00

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#include "../nde.h"
#include "../NDEString.h"
#include "Query.h"
//---------------------------------------------------------------------------
BOOL Scanner::Query(const wchar_t *query)
{
if (!query) return FALSE;
ndestring_release(last_query);
last_query = ndestring_wcsdup(query);
RemoveFilters();
in_query_parser = 1;
BOOL r = Query_Parse(query);
if (r == FALSE)
{
if (!disable_date_resolution) RemoveFilters();
last_query_failed = TRUE;
}
in_query_parser = 0;
Query_CleanUp();
return r & CheckFilters();
}
const wchar_t *Scanner::GetLastQuery()
{
return last_query;
}
typedef struct
{
const wchar_t *token;
int tid;
} tokenstruct;
tokenstruct Tokens[] = // Feel free to add more...
{
{L"AND", TOKEN_AND },
{L"OR", TOKEN_OR },
{L"HAS", TOKEN_CONTAINS },
{L"NOTHAS",TOKEN_NOTCONTAINS},
{L"BEGINS", TOKEN_BEGINS },
{L"ENDS", TOKEN_ENDS },
{L"ISEMPTY", TOKEN_ISEMPTY},
{L"ISNOTEMPTY",TOKEN_ISNOTEMPTY},
{L"LIKE", TOKEN_LIKE},
{L"BEGINSLIKE", TOKEN_BEGINSLIKE},
};
typedef struct
{
int Op;
int Level;
} OpLevel;
static int Query_ParseLength(const wchar_t *str)
{
int i = (str ? _wtoi(str) : 0);
const wchar_t *p;
if ((p=wcsstr(str,L":")))
{
i*=60;
i+=_wtoi(++p);
if ((p=wcsstr(p,L":")))
{
i*=60;
i+=_wtoi(++p);
}
}
return i;
}
/*
our state machine
&, |
----------<-------------------------<----------------------<-----------
| |
v ID (Col) =, >, <... ID / Data / [f] ) |
---->(0) ----->-----> (1) ------>-----> (2) ------>------> (3) ------>-----> (4) <--
| |^ \isempty------------->------------/ |^ | |
| !( || ||---- | ) |
--<-- ---------<---------------------------<-------------<-| | -->--
&, | v [f] |
-->--
*/
//---------------------------------------------------------------------------
BOOL Scanner::Query_Parse(const wchar_t *query)
{
const wchar_t *p = query; // pointer on next token to read
int state = 0;
int pcount = 0;
VListEntry<OpLevel> *entry = 0;
if (pstack.GetNElements() > 0)
Query_CleanUp();
while (1)
{
p = Query_EatSpace(p);
int size = 0, t = Query_GetNextToken(p, &size, &token);
if (t == TOKEN_UNKNOWN)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
if (t == TOKEN_EOQ)
break;
switch (state)
{
case 0:
switch (t)
{
case TOKEN_PAROPEN:
state = 0;
// check too many parenthesis open
if (pcount == 255)
{
Query_SyntaxError((int)(p-query)); // should not be _syntax_ error
return FALSE;
}
// up one level
pcount++;
break;
case TOKEN_NOT:
// push not in this level
OpLevel o;
o.Op = FILTER_NOT;
o.Level = pcount;
entry = new VListEntry<OpLevel>;
entry->SetVal(o);
pstack.AddEntry(entry, TRUE);
state = 0;
break;
case TOKEN_IDENTIFIER:
state = 1;
// create filter column
if (AddFilterByName(token, NULL, FILTER_NONE) == ADDFILTER_FAILED)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
break;
default:
Query_SyntaxError((int)(p-query));
return FALSE;
}
break;
case 1:
switch (t)
{
case TOKEN_EQUAL:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_EQUALS);
break;
}
case TOKEN_ABOVE:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_ABOVE);
break;
}
case TOKEN_BELOW:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_BELOW);
break;
}
case TOKEN_CONTAINS:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_CONTAINS);
break;
}
case TOKEN_NOTCONTAINS:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_NOTCONTAINS);
break;
}
case TOKEN_AOREQUAL:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_ABOVEOREQUAL);
break;
}
case TOKEN_BOREQUAL:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_BELOWOREQUAL);
break;
}
case TOKEN_NOTEQUAL:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_NOTEQUALS);
break;
}
case TOKEN_BEGINS:
{
state = 2;
Filter *f = GetLastFilter();
f->SetOp(FILTER_BEGINS);
}
break;
case TOKEN_ENDS:
{
state = 2;
Filter *f = GetLastFilter();
f->SetOp(FILTER_ENDS);
}
break;
case TOKEN_LIKE:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_LIKE);
break;
}
case TOKEN_BEGINSLIKE:
{
state = 2;
// set filter op
Filter *f = GetLastFilter();
f->SetOp(FILTER_BEGINSLIKE);
break;
}
case TOKEN_ISNOTEMPTY:
case TOKEN_ISEMPTY:
{
state = 3;
Filter *f = GetLastFilter();
f->SetOp(t==TOKEN_ISEMPTY ? FILTER_ISEMPTY : FILTER_ISNOTEMPTY);
// pop all operators in this level beginning by the last inserted
entry = (VListEntry<OpLevel> *)pstack.GetFoot();
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
}
break;
default:
Query_SyntaxError((int)(p-query));
return FALSE;
}
break;
case 2:
if (t == TOKEN_SQBRACKETOPEN)
{
state = 3;
const wchar_t *s = wcschr(p, L']');
if (!s)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
p = Query_EatSpace(p);
if (p && *p == L'[') p++;
wchar_t *format = ndestring_wcsndup(p, s-p);
Filter *f = GetLastFilter();
int id = f->GetId();
ColumnField *c = GetColumnById(id);
int tt = c ? c->GetDataType() : -1;
if (disable_date_resolution || !c || (tt != FIELD_INTEGER && tt != FIELD_DATETIME && tt != FIELD_LENGTH && tt != FIELD_BOOLEAN))
{
if (disable_date_resolution)
{
StringField *field = (StringField *)f->Data();
if (!field)
{
// format was used without a value, assume value is 0
f->SetData(new StringField(L""));
entry = (VListEntry<OpLevel> *)pstack.GetFoot();
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
field = (StringField*)f->Data();
}
field->SetNDEString(format);
ndestring_release(format);
p = s+1;
continue;
}
ndestring_release(format);
Query_SyntaxError((int)(p-query));
return FALSE;
}
IntegerField *field = (IntegerField *)f->Data();
if (!field)
{
// format was used without a value, assume value is 0
f->SetData(new IntegerField(0));
entry = (VListEntry<OpLevel> *)pstack.GetFoot();
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
field = (IntegerField *)f->Data();
}
int r = field->ApplyConversion(format);
ndestring_release(format);
if (!r)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
p = s+1;
continue;
}
// switch (t) {
// case TOKEN_IDENTIFIER:
else // JF> we make this relaxed, so anything is valid as a value
{
state = 3;
// set filter data
Filter *f = GetLastFilter();
int id = f->GetId();
ColumnField *c = GetColumnById(id);
switch (c ? c->GetDataType() : -1)
{
case FIELD_DATETIME:
if (disable_date_resolution)
goto field_string_override;
case FIELD_LENGTH:
{
IntegerField *i_f = new IntegerField();
int i = Query_ParseLength(token);
i_f->SetValue(i);
f->SetData(i_f);
}
break;
case FIELD_BOOLEAN:
case FIELD_INTEGER:
{
IntegerField *i_f = new IntegerField();
int i = _wtoi(token);
i_f->SetValue(i);
f->SetData(i_f);
}
break;
case FIELD_INT64:
{
Int64Field *i_f = new Int64Field();
int64_t i = _wtoi64(token); // todo: Replace with own conversion and error checking
i_f->SetValue(i);
f->SetData(i_f);
}
break;
case FIELD_FILENAME:
{
FilenameField *s_f = new FilenameField();
s_f->SetNDEString(token);
f->SetData(s_f);
}
break;
case FIELD_STRING:
field_string_override:
{
StringField *s_f = new StringField();
s_f->SetNDEString(token);
f->SetData(s_f);
}
break;
default:
Query_SyntaxError((int)(p-query));
return FALSE;
break;
}
// pop all operators in this level beginning by the last inserted
entry = (VListEntry<OpLevel> *)pstack.GetFoot();
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
break;
}
// default:
// Query_SyntaxError(p-query);
// return FALSE;
// }
break;
case 3:
switch (t)
{
case TOKEN_SQBRACKETOPEN:
{
const wchar_t *s = wcschr(p, L']');
if (!s)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
p = Query_EatSpace(p);
if (p && *p == L'[') p++;
wchar_t *format = ndestring_wcsndup(p, s-p);
Filter *f = GetLastFilter();
int id = f->GetId();
ColumnField *c = GetColumnById(id);
int tt = c ? c->GetDataType() : -1;
if (disable_date_resolution || !c || (tt != FIELD_INTEGER && tt != FIELD_DATETIME && tt != FIELD_LENGTH && tt != FIELD_BOOLEAN))
{
if (disable_date_resolution)
{
StringField *field = (StringField *)f->Data();
if (!field)
{
// format was used without a value, assume value is 0
f->SetData(new StringField(L""));
entry = (VListEntry<OpLevel> *)pstack.GetFoot();
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
field = (StringField *)f->Data();
}
field->SetNDEString(format);
ndestring_release(format);
p = s+1;
continue;
}
ndestring_release(format);
Query_SyntaxError((int)(p-query));
return FALSE;
}
IntegerField *field = (IntegerField *)f->Data();
if (!field)
{
// format was used without a value, assume value is 0
f->SetData(new IntegerField(0));
entry = (VListEntry<OpLevel> *)pstack.GetFoot();
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
field = (IntegerField *)f->Data();
}
int r = field->ApplyConversion(format);
ndestring_release(format);
if (!r)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
p = s+1;
continue;
}
break;
case TOKEN_PARCLOSE:
state = 4;
// check parenthesis count
if (pcount == 0)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
// down one level
pcount--;
// pop all operators in this level, beginning by the last inserted
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
break;
case TOKEN_AND:
{
state = 0;
// push and
OpLevel o;
o.Op = FILTER_AND;
o.Level = pcount;
entry = new VListEntry<OpLevel>;
entry->SetVal(o);
pstack.AddEntry(entry, TRUE);
break;
}
case TOKEN_OR:
{
state = 0;
// push or
OpLevel o;
o.Op = FILTER_OR;
o.Level = pcount;
entry = new VListEntry<OpLevel>;
entry->SetVal(o);
pstack.AddEntry(entry, TRUE);
break;
}
default:
Query_SyntaxError((int)(p-query));
return FALSE;
}
break;
case 4:
switch (t)
{
case TOKEN_AND:
{
state = 0;
// push and
OpLevel o;
o.Op = FILTER_AND;
o.Level = pcount;
entry = new VListEntry<OpLevel>;
entry->SetVal(o);
pstack.AddEntry(entry, TRUE);
break;
}
case TOKEN_OR:
{
state = 0;
// push or
OpLevel o;
o.Op = FILTER_OR;
o.Level = pcount;
entry = new VListEntry<OpLevel>;
entry->SetVal(o);
pstack.AddEntry(entry, TRUE);
break;
}
case TOKEN_PARCLOSE:
state = 4;
// check parenthesis count
if (pcount == 0)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
// down one level
pcount--;
// pop all operators in this level, beginning by the last inserted
while (entry)
{
if (entry->GetVal().Level == pcount)
{
AddFilterOp(entry->GetVal().Op);
VListEntry<OpLevel> *_entry = (VListEntry<OpLevel> *)entry->GetPrevious();
pstack.RemoveEntry(entry);
entry = _entry;
}
else
break;
}
break;
default:
Query_SyntaxError((int)(p-query));
return FALSE;
}
break;
default:
// Ahem... :/
break;
}
p += size;
}
if (pcount > 0)
{
Query_SyntaxError((int)(p-query));
return FALSE;
}
return TRUE;
}
//---------------------------------------------------------------------------
void Scanner::Query_SyntaxError(int c)
{
}
//---------------------------------------------------------------------------
void Scanner::Query_CleanUp()
{
while (pstack.GetNElements() > 0)
{
VListEntry<int> *e;
e = (VListEntry<int> *)pstack.GetHead();
pstack.RemoveEntry(e);
}
}
//---------------------------------------------------------------------------
const wchar_t *Scanner::Query_EatSpace(const wchar_t *p)
{
while (p && *p && *p == L' ') p++;
return p;
}
//---------------------------------------------------------------------------
const wchar_t *Scanner::Query_ProbeNonAlphaNum(const wchar_t *p)
{
int inquote=0;
while (p && *p && (!Query_isControlChar(*p) || (inquote)))
{
if (*p == L'\"')
{
if (!inquote)
inquote = 1;
else
return p+1;
}
p++;
}
return p;
}
//---------------------------------------------------------------------------
int Scanner::Query_isControlChar(wchar_t p)
{
switch (p)
{
case L'&':
case L'|':
case L'!':
case L'(':
case L'[':
case L')':
case L']':
case L'>':
case L'<':
case L'=':
case L',':
case L' ':
return TRUE;
}
return FALSE;
}
//---------------------------------------------------------------------------
wchar_t *Scanner::Query_ProbeAlphaNum(wchar_t *p)
{
while (p && *p && Query_isControlChar(*p)) p++;
return p;
}
//---------------------------------------------------------------------------
wchar_t *Scanner::Query_ProbeSpace(wchar_t *p)
{
while (p && *p && *p != ' ') p++;
return p;
}
//---------------------------------------------------------------------------
int Scanner::Query_LookupToken(const wchar_t *t)
{
for (int i=0;i<sizeof(Tokens)/sizeof(tokenstruct);i++)
{
if (!_wcsicmp(Tokens[i].token, t))
return Tokens[i].tid;
}
return TOKEN_IDENTIFIER;
}
//---------------------------------------------------------------------------
int Scanner::Query_GetNextToken(const wchar_t *p, int *size, wchar_t **_token, int tokentable)
{
int t = TOKEN_EOQ;
const wchar_t *startptr = p;
if (!p || !*p) return TOKEN_EOQ;
p = Query_EatSpace(p);
const wchar_t *e = Query_ProbeNonAlphaNum(p);
if (e != p) // We have a word
{
size_t token_length = e-p;
if (*_token) ndestring_release(*_token);
*_token = ndestring_wcsndup(p, token_length);
if (*(*_token) == L'\"' && (*_token)[token_length-1] == L'\"') // check for quoted string
{
int l=(int)token_length-2;
if (l>0)
{
memcpy(*_token,(*_token)+1,l*sizeof(wchar_t));
(*_token)[l]=0;
Query_Unescape(*_token);
}
else
(*_token)[0]=0;// we have an empty string
}
switch (tokentable)
{
case -1:
t = TOKEN_IDENTIFIER;
break;
case 0:
t = Query_LookupToken(*_token);
break;
case 1:
t = IntegerField::LookupToken(*_token);
}
p = e;
}
else // We have a symbol
{
switch (*p)
{
case L'&':
if (*(p+1) == L'&') p++;
t = TOKEN_AND;
break;
case L'|':
if (*(p+1) == L'|') p++;
t = TOKEN_OR;
break;
case L'!':
if (*(p+1) == L'=')
{
p++;
t = TOKEN_NOTEQUAL;
break;
}
t = TOKEN_NOT;
break;
case L'(':
t = TOKEN_PAROPEN;
break;
case L')':
t = TOKEN_PARCLOSE;
break;
case L'[':
t = TOKEN_SQBRACKETOPEN;
break;
case L']':
t = TOKEN_SQBRACKETCLOSE;
break;
case L',':
t = TOKEN_COMMA;
break;
case L'>':
if (*(p+1) == L'=')
{
p++;
t = TOKEN_AOREQUAL;
break;
}
if (*(p+1) == L'<')
{
p++;
t = TOKEN_NOTEQUAL;
break;
}
t = TOKEN_ABOVE;
break;
case L'<':
if (*(p+1) == L'=')
{
p++;
t = TOKEN_BOREQUAL;
break;
}
if (*(p+1) == L'>')
{
p++;
t = TOKEN_NOTEQUAL;
break;
}
t = TOKEN_BELOW;
break;
case L'=':
if (*(p+1) == L'>')
{
p++;
t = TOKEN_AOREQUAL;
break;
}
if (*(p+1) == L'<')
{
p++;
t = TOKEN_BOREQUAL;
break;
}
if (*(p+1) == L'!')
{
p++;
t = TOKEN_NOTEQUAL;
break;
}
if (*(p+1) == L'=') p++;
t = TOKEN_EQUAL;
break;
default:
t = TOKEN_UNKNOWN;
break;
}
p++;
}
*size = (int)(p - startptr);
return t;
}
static uint8_t quickhex(wchar_t c)
{
int hexvalue = c;
if (hexvalue & 0x10)
hexvalue &= ~0x30;
else
{
hexvalue &= 0xF;
hexvalue += 9;
}
return hexvalue;
}
static uint8_t DecodeEscape(const wchar_t *&str)
{
uint8_t a = quickhex(*++str);
uint8_t b = quickhex(*++str);
str++;
return a * 16 + b;
}
static void DecodeEscapedUTF8(wchar_t *&output, const wchar_t *&input)
{
uint8_t utf8_data[1024] = {0}; // hopefully big enough!!
int num_utf8_words=0;
bool error=false;
while (input && *input == '%' && num_utf8_words < sizeof(utf8_data))
{
if (iswxdigit(input[1]) && iswxdigit(input[2]))
{
utf8_data[num_utf8_words++]=DecodeEscape(input);
}
else if (input[1] == '%')
{
input+=2;
utf8_data[num_utf8_words++]='%';
}
else
{
error = true;
break;
}
}
int len = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)utf8_data, num_utf8_words, 0, 0);
MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)utf8_data, num_utf8_words, output, len);
output += len;
if (error)
{
*output++ = *input++;
}
}
// benski> We have the luxury of knowing that decoding will ALWAYS produce smaller strings
// so we can do it in-place
void Query_Unescape(wchar_t *str)
{
const wchar_t *itr = str;
while (itr && *itr)
{
switch (*itr)
{
case '%':
DecodeEscapedUTF8(str, itr);
break;
default:
*str++ = *itr++;
break;
}
}
*str = 0;
}
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