Method _get_token

core/math/expression.cpp:43–522

#include "core/object/class_db.h"

Error Expression::_get_token(Token &r_token) {
	while (true) {
#define GET_CHAR() (str_ofs >= expression.length() ? 0 : expression[str_ofs++])

		char32_t cchar = GET_CHAR();

		switch (cchar) {
			case 0: {
				r_token.type = TK_EOF;
				return OK;
			}
			case '{': {
				r_token.type = TK_CURLY_BRACKET_OPEN;
				return OK;
			}
			case '}': {
				r_token.type = TK_CURLY_BRACKET_CLOSE;
				return OK;
			}
			case '[': {
				r_token.type = TK_BRACKET_OPEN;
				return OK;
			}
			case ']': {
				r_token.type = TK_BRACKET_CLOSE;
				return OK;
			}
			case '(': {
				r_token.type = TK_PARENTHESIS_OPEN;
				return OK;
			}
			case ')': {
				r_token.type = TK_PARENTHESIS_CLOSE;
				return OK;
			}
			case ',': {
				r_token.type = TK_COMMA;
				return OK;
			}
			case ':': {
				r_token.type = TK_COLON;
				return OK;
			}
			case '$': {
				r_token.type = TK_INPUT;
				int index = 0;
				do {
					if (!is_digit(expression[str_ofs])) {
						_set_error("Expected number after '$'");
						r_token.type = TK_ERROR;
						return ERR_PARSE_ERROR;
					}
					index *= 10;
					index += expression[str_ofs] - '0';
					str_ofs++;

				} while (is_digit(expression[str_ofs]));