init2
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1af61d2eef
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424def7590
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@ -1,2 +1,3 @@
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*/build/
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build/
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.vscode/settings.json
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@ -3,6 +3,9 @@
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"xstring": "cpp",
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"iterator": "cpp",
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"ostream": "cpp",
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"vector": "cpp"
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"vector": "cpp",
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"sstream": "cpp",
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"queue": "cpp",
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"set": "cpp"
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}
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}
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@ -22,3 +22,6 @@ add_executable(main ${SOURCES_MAIN})
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# 链接静态库
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target_link_libraries(main PRIVATE LL nfa)
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@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.10)
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project(nfa)
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# 收集所有的cpp源文件
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file(GLOB SOURCES "*.cpp")
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file(GLOB SOURCES dfa.cpp nfa.cpp tool.cpp test_main.cpp)
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# 设置输出目录为 bin
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
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@ -12,3 +12,9 @@ add_library(nfa STATIC ${SOURCES})
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# 添加头文件目录
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target_include_directories(nfa PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
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# 添加可执行文件
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add_executable(test_nfa test_main.cpp nfa)
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# 链接目标库
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target_link_libraries(test_nfa nfa)
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64
nfa/nfa.cpp
64
nfa/nfa.cpp
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@ -11,12 +11,12 @@
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NFA RexToNFA() {
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//由于里面存在||,所以不同正则间使用空格分隔代表| l代表letter，_代表下划线，0代表数字(也可以是d，但是为了使用已经有的函数)，
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//[lu]代表l|u
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string rex = "+ - * / % = > < == <= >= != && || ( ) { } , ; [l_][l_0]* -?00*";
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string rex = "+ - * / % = > < == <= >= != && || ( ) { } , ; [l_][l_0]* -?00* -?[0-9]+\\.[0-9]+";
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//下面给出正则对应的输出(终态)
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vector<WordType> finalState = {
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OP_ADD, OP_SUB,OP_MUL,OP_DIV,OP_MOD,OP_ASSIGN,OP_GT,OP_LT, OP_EQ,OP_LE,OP_GE,OP_NE, OP_AND, OP_OR,SE_LBRAC, SE_RBRAC,
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SE_LCBRAC,SE_RCBRAC,SE_COMMA,SE_SEMI,IDN,INT_VAL
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SE_LCBRAC,SE_RCBRAC,SE_COMMA,SE_SEMI,IDN,INT_VAL,FLOAT_CONST
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};
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stringstream ss(rex);
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@ -34,6 +34,21 @@ NFA RexToNFA() {
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//如获得[l_][l_0]*
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State* currentState = startState;
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cout<<target<<endl;
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if (target == "-?[0-9]+\\.[0-9]+") {
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// 处理浮点数
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for (size_t i = 0; i < target.length(); i++) {
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State* newState = new State(stateIndex++);
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allStates.insert(newState);
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InputCharType input = getInputCharType(target[i]);
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currentState->addTransition(input, newState);
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currentState = newState;
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}
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currentState->setFinalState(true, finalState[endStates.size()]);
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endStates.insert(currentState);
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continue;
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}
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for (size_t i = 0; i < target.length();i++) {
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//创建一个新状态，startState通过输入InputCharType到达该状态
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State* newState = new State(stateIndex++);
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@ -86,53 +101,10 @@ NFA RexToNFA() {
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}//for
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}
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// 返回字符集合对应的NFA
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cout<<"ok"<<endl;
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return NFA(startState, endStates, allStates);
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}
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// 构造状态机
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NFA buildNFA(string filename) {
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ifstream ifs(filename);
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if (!ifs) {
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cerr << "Cannot open file: " << filename << endl;
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exit(EXIT_FAILURE);
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}
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int stateNum, inputNum;
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ifs >> stateNum >> inputNum;
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vector<State*> states(stateNum);
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for (int i = 0; i < stateNum; i++) {
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states[i] = new State(i);
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}
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State* startState = states[0];
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set<State*, StatePtrCompare> endStates;
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for (int i = 0; i < stateNum; i++) {
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for (int j = 0; j < inputNum; j++) {
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string targetStateIDs;
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ifs >> targetStateIDs;
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if (targetStateIDs.compare("#") != 0) {
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stringstream ss(targetStateIDs);
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string targetStateIDStr;
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while (getline(ss, targetStateIDStr, ',')) {
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int targetStateID = stoi(targetStateIDStr);
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states[i]->addTransition(static_cast<InputCharType>(j), states[targetStateID]);
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}
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}
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}
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}
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int endStateNum;
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ifs >> endStateNum;
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for (int i = 0; i < endStateNum; i++) {
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int endStateID, wordTypeID;
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ifs >> endStateID >> wordTypeID;
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states[endStateID]->setFinalState(true, static_cast<WordType>(wordTypeID));
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endStates.insert(states[endStateID]);
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}
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return NFA(startState, endStates, set<State*, StatePtrCompare>(states.begin(), states.end()));
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}
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void printNFA(const NFA& nfa) {
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cout << "Start state: " << nfa.startState->id << endl;
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@ -26,6 +26,9 @@ typedef enum WordType {
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KW_RETURN, // return
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KW_CONST, // const
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KW_MAIN, //main
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KW_IF,
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KW_ELSE,
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KW_FLOAT,
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OP_ADD, // +
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OP_SUB, // -
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@ -51,6 +54,7 @@ typedef enum WordType {
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IDN, // [a-zA-Z][a-zA-Z_0-9]*
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INT_VAL, // -*[0-9]+
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FLOAT_CONST, //[0-9]+'.'[0-9]+
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UNKOWN
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}WordType;
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string getWordTypeName(WordType type);
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@ -81,6 +85,7 @@ typedef enum InputCharType {
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RCBRAC, // } 17
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COMMA, // , 18
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SEMI, // ; 19
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POINT, // .
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EPSILON, // 空字符 20
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}InputCharType;
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// 正则表达式构建状态机
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NFA RexToNFA();
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void printNFA(const NFA& nfa);
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NFA buildNFA(string filename);
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NFA RexToNFA();
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set<State*, StatePtrCompare> move(const set<State*, StatePtrCompare>& states, InputCharType input);
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set<State*, StatePtrCompare> epsilonClosure(const set<State*, StatePtrCompare>& states);
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#include <iostream>
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#include <fstream>
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#include <cassert>
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#include "nfa.h"
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using namespace std;
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int main(int argc, char** argv) {
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NFA nfa = RexToNFA();
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//printNFA(nfa);
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cout<<"OK1";
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DFA dfa = nfaToDFA(nfa);
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cout<<"OK2";
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//printDFA(dfa);
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DFA minimizedDFA = minimizeDFA(minimizeDFA(dfa));
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removeUnreachableStates(minimizedDFA);
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//printDFA(minimizedDFA);
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return 0;
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}
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@ -31,6 +31,7 @@ InputCharType getInputCharType(char c) {
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case '}': return RCBRAC;
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case ',': return COMMA;
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case ';': return SEMI;
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case '.': return POINT;
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default:
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if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
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return LETTER;
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@ -88,6 +89,8 @@ string getInputChartypeName(InputCharType type) {
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return ",";
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case SEMI:
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return ";";
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case POINT:
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return ".";
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case EPSILON:
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return "EPSILON";
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default:
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@ -136,6 +139,8 @@ string getWordTypeName(WordType type, string buffer) {
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// 整数
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case INT_VAL:
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return "INT";
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case FLOAT_CONST:
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return "FLOAT";
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//default
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default:
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