godot/core/math/expression.h
2024-03-07 22:39:09 -06:00

276 lines
6.3 KiB
C++

/**************************************************************************/
/* expression.h */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#ifndef EXPRESSION_H
#define EXPRESSION_H
#include "core/object/ref_counted.h"
class Expression : public RefCounted {
GDCLASS(Expression, RefCounted);
private:
struct Input {
Variant::Type type = Variant::NIL;
String name;
Input() {}
};
Vector<Input> inputs;
Variant::Type output_type = Variant::NIL;
String expression;
bool sequenced = false;
int str_ofs = 0;
bool expression_dirty = false;
bool _compile_expression();
enum TokenType {
TK_CURLY_BRACKET_OPEN,
TK_CURLY_BRACKET_CLOSE,
TK_BRACKET_OPEN,
TK_BRACKET_CLOSE,
TK_PARENTHESIS_OPEN,
TK_PARENTHESIS_CLOSE,
TK_IDENTIFIER,
TK_BUILTIN_FUNC,
TK_SELF,
TK_CONSTANT,
TK_BASIC_TYPE,
TK_COLON,
TK_COMMA,
TK_PERIOD,
TK_OP_IN,
TK_OP_EQUAL,
TK_OP_NOT_EQUAL,
TK_OP_LESS,
TK_OP_LESS_EQUAL,
TK_OP_GREATER,
TK_OP_GREATER_EQUAL,
TK_OP_AND,
TK_OP_OR,
TK_OP_NOT,
TK_OP_ADD,
TK_OP_SUB,
TK_OP_MUL,
TK_OP_DIV,
TK_OP_MOD,
TK_OP_POW,
TK_OP_SHIFT_LEFT,
TK_OP_SHIFT_RIGHT,
TK_OP_BIT_AND,
TK_OP_BIT_OR,
TK_OP_BIT_XOR,
TK_OP_BIT_INVERT,
TK_INPUT,
TK_EOF,
TK_ERROR,
TK_MAX
};
static const char *token_name[TK_MAX];
struct Token {
TokenType type;
Variant value;
};
void _set_error(const String &p_err) {
if (error_set) {
return;
}
error_str = p_err;
error_set = true;
}
Error _get_token(Token &r_token);
String error_str;
bool error_set = true;
struct ENode {
enum Type {
TYPE_INPUT,
TYPE_CONSTANT,
TYPE_SELF,
TYPE_OPERATOR,
TYPE_INDEX,
TYPE_NAMED_INDEX,
TYPE_ARRAY,
TYPE_DICTIONARY,
TYPE_CONSTRUCTOR,
TYPE_BUILTIN_FUNC,
TYPE_CALL
};
ENode *next = nullptr;
Type type = TYPE_INPUT;
ENode() {}
virtual ~ENode() {
if (next) {
memdelete(next);
}
}
};
struct ExpressionNode {
bool is_op = false;
union {
Variant::Operator op;
ENode *node = nullptr;
};
};
ENode *_parse_expression();
struct InputNode : public ENode {
int index = 0;
InputNode() {
type = TYPE_INPUT;
}
};
struct ConstantNode : public ENode {
Variant value = Variant::NIL;
ConstantNode() {
type = TYPE_CONSTANT;
}
};
struct OperatorNode : public ENode {
Variant::Operator op = Variant::Operator::OP_ADD;
ENode *nodes[2] = { nullptr, nullptr };
OperatorNode() {
type = TYPE_OPERATOR;
}
};
struct SelfNode : public ENode {
SelfNode() {
type = TYPE_SELF;
}
};
struct IndexNode : public ENode {
ENode *base = nullptr;
ENode *index = nullptr;
IndexNode() {
type = TYPE_INDEX;
}
};
struct NamedIndexNode : public ENode {
ENode *base = nullptr;
StringName name;
NamedIndexNode() {
type = TYPE_NAMED_INDEX;
}
};
struct ConstructorNode : public ENode {
Variant::Type data_type = Variant::Type::NIL;
Vector<ENode *> arguments;
ConstructorNode() {
type = TYPE_CONSTRUCTOR;
}
};
struct CallNode : public ENode {
ENode *base = nullptr;
StringName method;
Vector<ENode *> arguments;
CallNode() {
type = TYPE_CALL;
}
};
struct ArrayNode : public ENode {
Vector<ENode *> array;
ArrayNode() {
type = TYPE_ARRAY;
}
};
struct DictionaryNode : public ENode {
Vector<ENode *> dict;
DictionaryNode() {
type = TYPE_DICTIONARY;
}
};
struct BuiltinFuncNode : public ENode {
StringName func;
Vector<ENode *> arguments;
BuiltinFuncNode() {
type = TYPE_BUILTIN_FUNC;
}
};
template <typename T>
T *alloc_node() {
T *node = memnew(T);
node->next = nodes;
nodes = node;
return node;
}
ENode *root = nullptr;
ENode *nodes = nullptr;
Vector<String> input_names;
bool execution_error = false;
bool _execute(const Array &p_inputs, Object *p_instance, Expression::ENode *p_node, Variant &r_ret, bool p_const_calls_only, String &r_error_str);
protected:
static void _bind_methods();
public:
Error parse(const String &p_expression, const Vector<String> &p_input_names = Vector<String>());
Variant execute(const Array &p_inputs = Array(), Object *p_base = nullptr, bool p_show_error = true, bool p_const_calls_only = false);
bool has_execute_failed() const;
String get_error_text() const;
Expression() {}
~Expression();
};
#endif // EXPRESSION_H