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godot/core/variant_construct_string.cpp

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8.3 KiB
C++
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#include "variant.h"
class VariantConstruct {
enum TokenType {
TK_CURLY_BRACKET_OPEN,
TK_CURLY_BRACKET_CLOSE,
TK_BRACKET_OPEN,
TK_BRACKET_CLOSE,
TK_IDENTIFIER,
TK_STRING,
TK_NUMBER,
TK_COLON,
TK_COMMA,
TK_EOF,
TK_MAX
};
enum Expecting {
EXPECT_OBJECT,
EXPECT_OBJECT_KEY,
EXPECT_COLON,
EXPECT_OBJECT_VALUE,
};
struct Token {
TokenType type;
Variant value;
};
static const char * tk_name[TK_MAX];
static String _print_var(const Variant& p_var);
static Error _get_token(const CharType *p_str,int &index, int p_len,Token& r_token,int &line,String &r_err_str);
static Error _parse_value(Variant &value,Token& token,const CharType *p_str,int &index, int p_len,int &line,String &r_err_str,Variant::ObjectConstruct* p_construct,void* p_ud);
static Error _parse_array(Array &array,const CharType *p_str,int &index, int p_len,int &line,String &r_err_str,Variant::ObjectConstruct* p_construct,void* p_ud);
static Error _parse_dict(Dictionary &object,const CharType *p_str,int &index, int p_len,int &line,String &r_err_str,Variant::ObjectConstruct* p_construct,void* p_ud);
public:
static Error parse(const String& p_string,Variant& r_ret,String &r_err_str,int &r_err_line,Variant::ObjectConstruct* p_construct,void* p_ud);
};
const char * VariantConstruct::tk_name[TK_MAX] = {
"'{'",
"'}'",
"'['",
"']'",
"identifier",
"string",
"number",
"':'",
"','",
"EOF",
};
Error VariantConstruct::_get_token(const CharType *p_str, int &idx, int p_len, Token& r_token,int &line,String &r_err_str) {
while (true) {
switch(p_str[idx]) {
case '\n': {
line++;
idx++;
break;
};
case 0: {
r_token.type=TK_EOF;
return OK;
} break;
case '{': {
r_token.type=TK_CURLY_BRACKET_OPEN;
idx++;
return OK;
};
case '}': {
r_token.type=TK_CURLY_BRACKET_CLOSE;
idx++;
return OK;
};
case '[': {
r_token.type=TK_BRACKET_OPEN;
idx++;
return OK;
};
case ']': {
r_token.type=TK_BRACKET_CLOSE;
idx++;
return OK;
};
case ':': {
r_token.type=TK_COLON;
idx++;
return OK;
};
case ',': {
r_token.type=TK_COMMA;
idx++;
return OK;
};
case '"': {
idx++;
String str;
while(true) {
if (p_str[idx]==0) {
r_err_str="Unterminated String";
return ERR_PARSE_ERROR;
} else if (p_str[idx]=='"') {
idx++;
break;
} else if (p_str[idx]=='\\') {
//escaped characters...
idx++;
CharType next = p_str[idx];
if (next==0) {
r_err_str="Unterminated String";
return ERR_PARSE_ERROR;
}
CharType res=0;
switch(next) {
case 'b': res=8; break;
case 't': res=9; break;
case 'n': res=10; break;
case 'f': res=12; break;
case 'r': res=13; break;
case '\"': res='\"'; break;
case '\\': res='\\'; break;
case '/': res='/'; break; //wtf
case 'u': {
//hexnumbarh - oct is deprecated
for(int j=0;j<4;j++) {
CharType c = p_str[idx+j+1];
if (c==0) {
r_err_str="Unterminated String";
return ERR_PARSE_ERROR;
}
if (!((c>='0' && c<='9') || (c>='a' && c<='f') || (c>='A' && c<='F'))) {
r_err_str="Malformed hex constant in string";
return ERR_PARSE_ERROR;
}
CharType v;
if (c>='0' && c<='9') {
v=c-'0';
} else if (c>='a' && c<='f') {
v=c-'a';
v+=10;
} else if (c>='A' && c<='F') {
v=c-'A';
v+=10;
} else {
ERR_PRINT("BUG");
v=0;
}
res<<=4;
res|=v;
}
idx+=4; //will add at the end anyway
} break;
default: {
r_err_str="Invalid escape sequence";
return ERR_PARSE_ERROR;
} break;
}
str+=res;
} else {
if (p_str[idx]=='\n')
line++;
str+=p_str[idx];
}
idx++;
}
r_token.type=TK_STRING;
r_token.value=str;
return OK;
} break;
default: {
if (p_str[idx]<=32) {
idx++;
break;
}
if (p_str[idx]=='-' || (p_str[idx]>='0' && p_str[idx]<='9')) {
//a number
const CharType *rptr;
double number = String::to_double(&p_str[idx],&rptr);
idx+=(rptr - &p_str[idx]);
r_token.type=TK_NUMBER;
r_token.value=number;
return OK;
} else if ((p_str[idx]>='A' && p_str[idx]<='Z') || (p_str[idx]>='a' && p_str[idx]<='z')) {
String id;
while((p_str[idx]>='A' && p_str[idx]<='Z') || (p_str[idx]>='a' && p_str[idx]<='z')) {
id+=p_str[idx];
idx++;
}
r_token.type=TK_IDENTIFIER;
r_token.value=id;
return OK;
} else {
r_err_str="Unexpected character.";
return ERR_PARSE_ERROR;
}
}
}
}
return ERR_PARSE_ERROR;
}
Error VariantConstruct::_parse_value(Variant &value,Token& token,const CharType *p_str,int &index, int p_len,int &line,String &r_err_str,Variant::ObjectConstruct* p_construct,void* p_ud) {
if (token.type==TK_CURLY_BRACKET_OPEN) {
Dictionary d;
Error err = _parse_dict(d,p_str,index,p_len,line,r_err_str,p_construct,p_ud);
if (err)
return err;
value=d;
return OK;
} else if (token.type==TK_BRACKET_OPEN) {
Array a;
Error err = _parse_array(a,p_str,index,p_len,line,r_err_str,p_construct,p_ud);
if (err)
return err;
value=a;
return OK;
} else if (token.type==TK_IDENTIFIER) {
String id = token.value;
if (id=="true")
value=true;
else if (id=="false")
value=false;
else if (id=="null")
value=Variant();
else {
r_err_str="Expected 'true','false' or 'null', got '"+id+"'.";
return ERR_PARSE_ERROR;
}
return OK;
} else if (token.type==TK_NUMBER) {
value=token.value;
return OK;
} else if (token.type==TK_STRING) {
value=token.value;
return OK;
} else {
r_err_str="Expected value, got "+String(tk_name[token.type])+".";
return ERR_PARSE_ERROR;
}
return ERR_PARSE_ERROR;
}
Error VariantConstruct::_parse_array(Array &array,const CharType *p_str,int &index, int p_len,int &line,String &r_err_str,Variant::ObjectConstruct* p_construct,void* p_ud) {
Token token;
bool need_comma=false;
while(index<p_len) {
Error err = _get_token(p_str,index,p_len,token,line,r_err_str);
if (err!=OK)
return err;
if (token.type==TK_BRACKET_CLOSE) {
return OK;
}
if (need_comma) {
if (token.type!=TK_COMMA) {
r_err_str="Expected ','";
return ERR_PARSE_ERROR;
} else {
need_comma=false;
continue;
}
}
Variant v;
err = _parse_value(v,token,p_str,index,p_len,line,r_err_str,p_construct,p_ud);
if (err)
return err;
array.push_back(v);
need_comma=true;
}
return OK;
}
Error VariantConstruct::_parse_dict(Dictionary &dict,const CharType *p_str,int &index, int p_len,int &line,String &r_err_str,Variant::ObjectConstruct* p_construct,void* p_ud) {
bool at_key=true;
Variant key;
Token token;
bool need_comma=false;
while(index<p_len) {
if (at_key) {
Error err = _get_token(p_str,index,p_len,token,line,r_err_str);
if (err!=OK)
return err;
if (token.type==TK_CURLY_BRACKET_CLOSE) {
return OK;
}
if (need_comma) {
if (token.type!=TK_COMMA) {
r_err_str="Expected '}' or ','";
return ERR_PARSE_ERROR;
} else {
need_comma=false;
continue;
}
}
err = _parse_value(key,token,p_str,index,p_len,line,r_err_str,p_construct,p_ud);
if (err!=OK)
return err;
err = _get_token(p_str,index,p_len,token,line,r_err_str);
if (err!=OK)
return err;
if (token.type!=TK_COLON) {
r_err_str="Expected ':'";
return ERR_PARSE_ERROR;
}
at_key=false;
} else {
Error err = _get_token(p_str,index,p_len,token,line,r_err_str);
if (err!=OK)
return err;
Variant v;
err = _parse_value(v,token,p_str,index,p_len,line,r_err_str,p_construct,p_ud);
if (err)
return err;
dict[key]=v;
need_comma=true;
at_key=true;
}
}
return OK;
}
Error VariantConstruct::parse(const String& p_string,Variant& r_ret,String &r_err_str,int &r_err_line,Variant::ObjectConstruct* p_construct,void* p_ud) {
const CharType *str = p_string.ptr();
int idx = 0;
int len = p_string.length();
Token token;
r_err_line=0;
String aux_key;
Error err = _get_token(str,idx,len,token,r_err_line,r_err_str);
if (err)
return err;
return _parse_value(r_ret,token,str,idx,len,r_err_line,r_err_str,p_construct,p_ud);
}
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