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