80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
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// simple_logic.h : include file for simple logical operation
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//
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// Purpose: to parse and execute a logical expression like 'b1 && !(b2 || b3) ^ b4 && b5'
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//
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// Date: 2023-09-03
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//
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// Author: gb
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//
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// Supporting opers: &&, ||, ^
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//
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// Priority: (&&, ^, ), (||)
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#pragma once
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#include <string>
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#include <vector>
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namespace string_util
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{
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// Function: find the ending position in str
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//
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// Parameter: str - the string beginning after the first letter 'head'
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//
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// head - the leading letter, can be emblaced
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//
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// tail - the ending letter
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//
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// Return: position at the ending letter, or '\0' in the string
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int find_end_of_pair(const char* str, char head, char tail);
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void skip_space(const char*& ptr, const char* space = " \t");
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enum
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{
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TRIM_LEFT = 1,
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TRIM_RIGHT,
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TRIM_BOTH,
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};
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void trim(std::string& str, int type = TRIM_BOTH);
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};
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class simple_logic
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{
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int oper_;
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bool not_;
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std::string expr_;
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simple_logic* l_;
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simple_logic* r_;
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void clear(void);
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void copy(const simple_logic& r);
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void set_not(bool notv);
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bool parse_internal(const char* expr, int* end, void(*leaf)(const char*, void*), void* leaf_param);
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simple_logic* make_binary(const std::vector<simple_logic*>& eles, const std::vector<int>& opers);
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std::string to_string_internal(bool& single);
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public:
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simple_logic();
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simple_logic(const simple_logic& r);
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~simple_logic();
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// && == ^ > ||
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enum
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{
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LOGIC_OPER_NONE = 0,
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LOGIC_OPER_LEAF,
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LOGIC_OPER_OR,
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LOGIC_OPER_AND,
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LOGIC_OPER_XOR,
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};
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simple_logic& operator=(const simple_logic& r);
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public:
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bool parse(const char* expr, int *end_pos = nullptr, void(*leaf)(const char*, void*) = nullptr, void* leaf_param = nullptr); // leaf: callback for leaf notifying
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bool value(bool(*simple_expr_value)(const char*, void*), void* param);
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std::string to_expression(void);
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};
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