a7f49ac9a1
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364 lines
7.3 KiB
C++
364 lines
7.3 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) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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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/reference.h"
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class Expression : public Reference {
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GDCLASS(Expression, Reference);
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public:
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enum BuiltinFunc {
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MATH_SIN,
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MATH_COS,
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MATH_TAN,
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MATH_SINH,
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MATH_COSH,
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MATH_TANH,
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MATH_ASIN,
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MATH_ACOS,
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MATH_ATAN,
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MATH_ATAN2,
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MATH_SQRT,
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MATH_FMOD,
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MATH_FPOSMOD,
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MATH_POSMOD,
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MATH_FLOOR,
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MATH_CEIL,
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MATH_ROUND,
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MATH_ABS,
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MATH_SIGN,
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MATH_POW,
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MATH_LOG,
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MATH_EXP,
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MATH_ISNAN,
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MATH_ISINF,
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MATH_EASE,
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MATH_DECIMALS,
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MATH_STEP_DECIMALS,
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MATH_STEPIFY,
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MATH_LERP,
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MATH_LERP_ANGLE,
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MATH_INVERSE_LERP,
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MATH_RANGE_LERP,
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MATH_SMOOTHSTEP,
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MATH_MOVE_TOWARD,
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MATH_DECTIME,
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MATH_RANDOMIZE,
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MATH_RAND,
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MATH_RANDF,
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MATH_RANDOM,
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MATH_SEED,
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MATH_RANDSEED,
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MATH_DEG2RAD,
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MATH_RAD2DEG,
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MATH_LINEAR2DB,
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MATH_DB2LINEAR,
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MATH_POLAR2CARTESIAN,
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MATH_CARTESIAN2POLAR,
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MATH_WRAP,
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MATH_WRAPF,
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LOGIC_MAX,
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LOGIC_MIN,
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LOGIC_CLAMP,
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LOGIC_NEAREST_PO2,
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OBJ_WEAKREF,
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FUNC_FUNCREF,
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TYPE_CONVERT,
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TYPE_OF,
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TYPE_EXISTS,
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TEXT_CHAR,
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TEXT_ORD,
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TEXT_STR,
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TEXT_PRINT,
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TEXT_PRINTERR,
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TEXT_PRINTRAW,
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VAR_TO_STR,
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STR_TO_VAR,
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VAR_TO_BYTES,
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BYTES_TO_VAR,
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COLORN,
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FUNC_MAX
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};
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static int get_func_argument_count(BuiltinFunc p_func);
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static String get_func_name(BuiltinFunc p_func);
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static void exec_func(BuiltinFunc p_func, const Variant **p_inputs, Variant *r_return, Variant::CallError &r_error, String &r_error_str);
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static BuiltinFunc find_function(const String &p_string);
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private:
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static const char *func_name[FUNC_MAX];
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struct Input {
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Variant::Type type;
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String name;
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Input() :
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type(Variant::NIL) {
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}
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};
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Vector<Input> inputs;
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Variant::Type output_type;
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String expression;
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bool sequenced;
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int str_ofs;
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bool expression_dirty;
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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_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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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;
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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;
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Type type;
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ENode() { next = NULL; }
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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;
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union {
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Variant::Operator op;
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ENode *node;
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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;
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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;
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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;
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ENode *nodes[2];
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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;
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ENode *index;
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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;
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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;
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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;
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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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BuiltinFunc 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;
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ENode *nodes;
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Vector<String> input_names;
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bool execution_error;
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bool _execute(const Array &p_inputs, Object *p_instance, Expression::ENode *p_node, Variant &r_ret, 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, Object *p_base = NULL, bool p_show_error = true);
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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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