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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
276 lines
6.3 KiB
C++
276 lines
6.3 KiB
C++
/**************************************************************************/
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/* expression.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef EXPRESSION_H
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#define EXPRESSION_H
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#include "core/object/ref_counted.h"
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class Expression : public RefCounted {
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GDCLASS(Expression, RefCounted);
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private:
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struct Input {
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Variant::Type type = Variant::NIL;
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String name;
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Input() {}
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};
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Vector<Input> inputs;
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Variant::Type output_type = Variant::NIL;
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String expression;
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bool sequenced = false;
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int str_ofs = 0;
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bool expression_dirty = false;
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bool _compile_expression();
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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_PARENTHESIS_OPEN,
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TK_PARENTHESIS_CLOSE,
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TK_IDENTIFIER,
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TK_BUILTIN_FUNC,
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TK_SELF,
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TK_CONSTANT,
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TK_BASIC_TYPE,
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TK_COLON,
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TK_COMMA,
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TK_PERIOD,
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TK_OP_IN,
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TK_OP_EQUAL,
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TK_OP_NOT_EQUAL,
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TK_OP_LESS,
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TK_OP_LESS_EQUAL,
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TK_OP_GREATER,
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TK_OP_GREATER_EQUAL,
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TK_OP_AND,
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TK_OP_OR,
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TK_OP_NOT,
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TK_OP_ADD,
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TK_OP_SUB,
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TK_OP_MUL,
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TK_OP_DIV,
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TK_OP_MOD,
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TK_OP_POW,
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TK_OP_SHIFT_LEFT,
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TK_OP_SHIFT_RIGHT,
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TK_OP_BIT_AND,
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TK_OP_BIT_OR,
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TK_OP_BIT_XOR,
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TK_OP_BIT_INVERT,
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TK_INPUT,
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TK_EOF,
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TK_ERROR,
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TK_MAX
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};
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static const char *token_name[TK_MAX];
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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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void _set_error(const String &p_err) {
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if (error_set) {
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return;
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}
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error_str = p_err;
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error_set = true;
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}
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Error _get_token(Token &r_token);
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String error_str;
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bool error_set = true;
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struct ENode {
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enum Type {
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TYPE_INPUT,
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TYPE_CONSTANT,
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TYPE_SELF,
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TYPE_OPERATOR,
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TYPE_INDEX,
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TYPE_NAMED_INDEX,
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TYPE_ARRAY,
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TYPE_DICTIONARY,
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TYPE_CONSTRUCTOR,
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TYPE_BUILTIN_FUNC,
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TYPE_CALL
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};
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ENode *next = nullptr;
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Type type = TYPE_INPUT;
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ENode() {}
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virtual ~ENode() {
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if (next) {
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memdelete(next);
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}
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}
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};
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struct ExpressionNode {
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bool is_op = false;
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union {
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Variant::Operator op;
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ENode *node = nullptr;
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};
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};
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ENode *_parse_expression();
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struct InputNode : public ENode {
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int index = 0;
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InputNode() {
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type = TYPE_INPUT;
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}
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};
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struct ConstantNode : public ENode {
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Variant value = Variant::NIL;
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ConstantNode() {
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type = TYPE_CONSTANT;
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}
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};
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struct OperatorNode : public ENode {
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Variant::Operator op = Variant::Operator::OP_ADD;
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ENode *nodes[2] = { nullptr, nullptr };
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OperatorNode() {
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type = TYPE_OPERATOR;
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}
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};
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struct SelfNode : public ENode {
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SelfNode() {
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type = TYPE_SELF;
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}
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};
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struct IndexNode : public ENode {
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ENode *base = nullptr;
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ENode *index = nullptr;
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IndexNode() {
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type = TYPE_INDEX;
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}
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};
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struct NamedIndexNode : public ENode {
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ENode *base = nullptr;
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StringName name;
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NamedIndexNode() {
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type = TYPE_NAMED_INDEX;
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}
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};
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struct ConstructorNode : public ENode {
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Variant::Type data_type = Variant::Type::NIL;
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Vector<ENode *> arguments;
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ConstructorNode() {
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type = TYPE_CONSTRUCTOR;
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}
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};
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struct CallNode : public ENode {
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ENode *base = nullptr;
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StringName method;
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Vector<ENode *> arguments;
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CallNode() {
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type = TYPE_CALL;
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}
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};
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struct ArrayNode : public ENode {
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Vector<ENode *> array;
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ArrayNode() {
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type = TYPE_ARRAY;
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}
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};
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struct DictionaryNode : public ENode {
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Vector<ENode *> dict;
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DictionaryNode() {
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type = TYPE_DICTIONARY;
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}
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};
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struct BuiltinFuncNode : public ENode {
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StringName func;
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Vector<ENode *> arguments;
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BuiltinFuncNode() {
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type = TYPE_BUILTIN_FUNC;
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}
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};
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template <class T>
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T *alloc_node() {
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T *node = memnew(T);
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node->next = nodes;
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nodes = node;
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return node;
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}
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ENode *root = nullptr;
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ENode *nodes = nullptr;
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Vector<String> input_names;
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bool execution_error = false;
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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);
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protected:
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static void _bind_methods();
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public:
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Error parse(const String &p_expression, const Vector<String> &p_input_names = Vector<String>());
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Variant execute(Array p_inputs = Array(), Object *p_base = nullptr, bool p_show_error = true, bool p_const_calls_only = false);
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bool has_execute_failed() const;
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String get_error_text() const;
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Expression() {}
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~Expression();
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};
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#endif // EXPRESSION_H
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