import?com.sun.java.accessibility.util.Translator;

import?java.io.File;
import?java.io.FileNotFoundException;
import?java.io.FileReader;
import?java.io.IOException;
import?java.util.ArrayList;
import?java.util.Arrays;

public?class?Recognizer?{
????private?static?final?String?NUMBER?=?“0123456789“;
????private?static?final?String?ALPHABET?=?“qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_“;


????private?FileReader?fileReader;
????private?int?currentCharacter?=?-2;??//當(dāng)前讀到的字符，fileReader（）的返回值為int，使用強制轉(zhuǎn)換轉(zhuǎn)為char
????????????????????????????????????????//-2表示還沒有讀文件

????private?int?state?=?1;??//狀態(tài)值，初始值為1，每識別一個Token后清0，恢復(fù)為1
????private?String?type;????//根據(jù)結(jié)束狀態(tài)值，識別出的值類型
????????????????????????????//identifier——標(biāo)識符，integerConstant——整數(shù)型數(shù)值常量（字符常量不由詞法分析器識別出來），floatConstant——浮點型數(shù)值常量，keyword——關(guān)鍵字，delimiter——定界符
????private?ArrayList?integerConstants?=?new?ArrayList<>（）;
????private?ArrayList?floatConstants?=?new?ArrayList<>（）;
????private?static?final?String[]?keywords?=?{“abstract“?“assert“?“boolean“?“break“?“byte“?“case“?“catch“?“char“?“class“
?????????????????????????????????“const“?“continue“?“default“?“do“?“double“?“else“?“enum“?“extends“?“final“
?????????????????????????????????“finally“?“float“?“for“?“goto“?“if“?“implements“?“import“?“instanceof“?“int“
?????????????????????????????????“interface“?“l(fā)ong“?“native“?“new“?“package“?“private“?“protected“?“public“
?????????????????????????????????“return“?“short“?“static“?“strictfp“?“super“?“switch“?“synchronized“?“this“
?????????????????????????????????“throw“?“throws“?“transient“?“try“?“void“?“volatile“?“while“};
????private?ArrayList?identifiers?=?new?ArrayList<>（）;
????private?static?final?char[]?singleDelimiter?=?{‘;‘?‘‘?‘（‘?‘）‘?‘:‘?‘+‘?‘-‘?‘*‘?‘/‘?‘%‘?‘=‘??‘>‘?‘<‘
??????????????????????????????????????‘{‘?‘}‘?‘.‘?‘[‘?‘]‘?‘?‘?‘!‘?‘&‘?‘~‘?‘|‘?‘^‘};
????private?static?final?String[]?doubleDelimiter?=?{“[]“?“（）“?“{}“?“<>“?“++“?“--“?“+=“?“-=“?“*=“?“/=“?“%=“?“&=“?“|=“
????????????????????????????????????????“^=“?“&&“?“||“?“>=“?“<=“?“==“?“!=“?“<<“?“>>“};?????????//對于更多位的界符>>>、instanceof、<<=、>>=、>>>=不支持

????private?ArrayList?delimiter?=?new?ArrayList<>（）;
????private?Token?currentToken;

????public?Recognizer（String?fileName）?throws?FileNotFoundException?{
????????fileReader?=?new?FileReader（new?File（fileName））;
????}


????public?int?execute（）?{
????????//在Windows中，\n是換行，即將光標(biāo)移到下一行，但水平位置不變；\r是將光標(biāo)移到該行的前面
????????while?（（char）currentCharacter?==?‘?‘?||?（char）currentCharacter?==?‘\n‘?||?（char）currentCharacter?==?‘\r‘?||?（char）currentCharacter?==?‘\t‘?||?currentCharacter?==?-2）?{
????????????try?{
????????????????currentCharacter?=?fileReader.read（）;
????????????}?catch?（IOException?e）?{
????????????????System.out.println（“Recognizer類start（）方法中，while循環(huán)中的fileReader.read（）拋出異?！埃?
????????????}
????????}

????????if?（currentChar

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2020-10-22?17:12??實驗一+實驗二的報告\
?????文件?????1194399??2020-10-22?17:06??實驗一+實驗二的報告\實驗報告.docx
?????文件??????147456??2020-10-22?17:00??實驗一+實驗二的報告\編譯方法實驗指導(dǎo)書.doc
?????目錄???????????0??2020-10-22?16:57??實驗一+實驗二的源代碼\
?????目錄???????????0??2020-10-22?16:57??實驗一+實驗二的源代碼\實驗1\
?????文件???????13817??2020-03-25?14:55??實驗一+實驗二的源代碼\實驗1\Recognizer.java
?????文件????????2433??2020-03-25?15:14??實驗一+實驗二的源代碼\實驗1\Scanner.java
?????文件?????????306??2020-04-07?23:17??實驗一+實驗二的源代碼\實驗1\testcase.txt
?????文件?????????377??2020-03-20?22:45??實驗一+實驗二的源代碼\實驗1\Token.java
?????目錄???????????0??2020-10-22?16:57??實驗一+實驗二的源代碼\實驗2\
?????文件????????3559??2020-04-13?14:49??實驗一+實驗二的源代碼\實驗2\Main.java
?????文件?????????495??2020-04-13?12:47??實驗一+實驗二的源代碼\實驗2\Operand.java
?????文件?????????222??2020-04-13?12:47??實驗一+實驗二的源代碼\實驗2\OperSymbol.java
?????文件?????????896??2020-04-13?12:47??實驗一+實驗二的源代碼\實驗2\Quat.java
?????文件??????????22??2020-04-11?10:33??實驗一+實驗二的源代碼\實驗2\testcase.txt