From 0e7aceaf8401fc0b2d0f0ad592260d35f30a1a61 Mon Sep 17 00:00:00 2001
From: Valk Richard Li <48872266+ValKmjolnir@users.noreply.github.com>
Date: Fri, 23 Aug 2019 17:58:51 +0800
Subject: [PATCH] New version with STL list & stack

---
 version0.6/main.cpp       |  66 ++++++++
 version0.6/nasal.h        |   8 +
 version0.6/nasal_lexer.h  | 323 ++++++++++++++++++++++++++++++++++++++
 version0.6/nasal_parser.h |  62 ++++++++
 4 files changed, 459 insertions(+)
 create mode 100644 version0.6/main.cpp
 create mode 100644 version0.6/nasal.h
 create mode 100644 version0.6/nasal_lexer.h
 create mode 100644 version0.6/nasal_parser.h

diff --git a/version0.6/main.cpp b/version0.6/main.cpp
new file mode 100644
index 0000000..6fb6b5d
--- /dev/null
+++ b/version0.6/main.cpp
@@ -0,0 +1,66 @@
+#include "nasal.h"
+#include <cstring>
+
+int main()
+{
+	resource_programme_process prog;
+	nasal_lexer lex;
+	nasal_parser par;
+	std::string command;
+	std::cout<<">> nasal-- script by ValKmjolnir"<<std::endl;
+	std::cout<<">> input \"help\" to find help."<<std::endl;
+	while(1)
+	{
+		std::cout<<">> ";
+		std::getline(std::cin,command);
+		if(command=="help")
+		{
+			std::cout<<">> nasal script interpreter by ValKmjolnir"<<std::endl;
+			std::cout<<">> 1.         |input file name to run the lexer. (-lexer)"<<std::endl;
+			std::cout<<">> 2. \"cls\"   |clear the screen."<<std::endl;
+			std::cout<<">> 3. \"exit\"  |shut down the program."<<std::endl;
+			std::cout<<">> 4. \"lexer\" |see tokens in stack."<<std::endl;
+			std::cout<<">> 5. \"parser\"|run parser. (-parser)"<<std::endl;
+			std::cout<<">> 6. \"del\"   |delete all elements in stack."<<std::endl;
+			std::cout<<">> 7. \"run\"   |run the programme in stack. (-lexer -parser)"<<std::endl;
+			std::cout<<">> 8. \"rs\"    |check the source program."<<std::endl;
+		}
+		else if(command=="cls")
+		{
+			system("cls");
+			//windows  system("cls);
+			//linux system("clear");
+			//macOS system("clear");
+		}
+		else if(command=="rs")
+			prog.print_file();
+		else if(command=="exit")
+		{
+			break;
+		}
+		else if(command=="lexer")
+		{
+			lex.lexer_process(prog.use_file());
+			lex.print_lexer();
+		}
+		else if(command=="del")
+		{
+			prog.del_file();
+			std::cout<<">>[Delete] Complete."<<std::endl;
+		}
+		else if(command=="parser")
+		{
+			par.parse_process(lex.return_list());//nasal::nasal_parse.print_parser(nasal::nasal_lexer);
+			par.print_parser();//nasal::nasal_parse.print_error();
+		}
+		else if(command=="run")
+		{
+			lex.lexer_process(prog.use_file());
+			par.parse_process(lex.return_list());
+			;//nasal::nasal_parse.print_error();
+		}
+		else
+			prog.input_file(command);
+	}
+	return 0;
+}
diff --git a/version0.6/nasal.h b/version0.6/nasal.h
new file mode 100644
index 0000000..5a928ec
--- /dev/null
+++ b/version0.6/nasal.h
@@ -0,0 +1,8 @@
+#ifndef __NASAL_H__
+#define __NASAL_H__
+
+#include "nasal_lexer.h"
+#include "nasal_parser.h"
+
+
+#endif
diff --git a/version0.6/nasal_lexer.h b/version0.6/nasal_lexer.h
new file mode 100644
index 0000000..308d875
--- /dev/null
+++ b/version0.6/nasal_lexer.h
@@ -0,0 +1,323 @@
+#ifndef __NASAL_LEXER_H__
+#define __NASAL_LEXER_H__
+
+#include <iostream>
+#include <fstream>
+#include <list>
+#include <cstring>
+
+#define OPERATOR    1 //界符 or 运算符 
+#define IDENTIFIER  2 //自定义标识符 
+#define NUMBER      3 //数字 
+#define RESERVEWORD 4 //关键字 
+#define STRING      5 //字符串类型 
+#define FAIL        -1 //失败 
+#define SCANEND     -2 //扫描完成 
+#define ERRORFOUND  -3 //异常错误 
+
+std::string reserve_word[15]=
+{
+	"for","foreach","forindex","while",
+	"var","func","break","continue","return",
+	"if","else","elsif","nil","and","or"
+};
+
+int isReserveWord(std::string &p)
+{
+	for(int i=0;i<15;++i)
+		if(reserve_word[i]==p)
+			return i+1;
+	return FAIL;
+}
+
+bool isLetter(char t)
+{
+	return (('a'<=t) && (t<='z') || ('A'<=t) && (t<='Z'));
+}
+
+bool isNumber(char t)
+{
+	return (('0'<=t) && (t<='9'));
+}
+
+class resource_programme_process
+{
+	private:
+		char *resource;
+	public:
+		resource_programme_process()
+		{
+			resource=NULL;
+			resource=new char[16777216];
+		}
+		~resource_programme_process()
+		{
+			if(resource)
+				delete []resource;
+		}
+		char* use_file()
+		{
+			return resource;
+		}
+		void input_file(std::string& filename)
+		{
+			std::ifstream fin(filename);
+			if(fin.fail())
+			{
+				std::cout<<">> [Error] Cannot load file: "<<filename<<" ."<<std::endl;
+				fin.close();
+				return;
+			}
+			memset(resource,0,sizeof(char));
+			int i=0;
+			bool findnote=false;// to find the note with # at the head of line.
+			while(!fin.eof())
+			{
+				resource[i]=fin.get();
+				if(resource[i]=='\n')
+					findnote=false;
+				//when meeting '\n' the findnote is set to false then the next statement can be executed.
+				if(resource[i]!='#' && !findnote)
+					++i;
+				else if(resource[i]=='#')
+					findnote=true;
+				if(fin.eof())
+					break;
+			}
+			resource[i]='\0';
+			fin.close();
+			return;
+		}
+		void print_file()
+		{
+			if(!resource[0])
+			{
+				std::cout<<"0	null"<<std::endl;
+				return;
+			}
+			int line=1;
+			std::cout<<line<<"	";
+			for(int i=0;i<16777216;++i)
+			{
+				if(!resource[i])
+					break;
+				std::cout<<resource[i];
+				if(resource[i]=='\n')
+				{
+					++line;
+					std::cout<<line<<"	";
+				}
+			}
+			std::cout<<std::endl;
+			return;
+		}
+		void del_file()
+		{
+			memset(resource,0,sizeof(char));
+			return;
+		}
+};
+
+struct token
+{
+	int line;
+	int type;
+	std::string content;
+};
+
+class nasal_lexer
+{
+	private:
+		std::list<token> lexer;
+	public:
+		void scanner(int &syn,const char* source,std::string &__token,int &ptr,int &line)
+		{
+			char temp;
+			temp=source[ptr];
+			while(temp==' ' || temp=='\n' || temp=='\t' || temp=='\r' || temp<0 || temp>127)
+			{
+				++ptr;
+				if(temp=='\n')
+					++line;
+				temp=source[ptr];
+			}
+			__token="";
+			if(isLetter(temp) || temp=='_')
+			{
+				__token+=temp;
+				++ptr;
+				temp=source[ptr];
+				while(isLetter(temp) || isNumber(temp) || temp=='_')
+				{
+					__token+=temp;
+					++ptr;
+					temp=source[ptr];
+				}
+				syn=isReserveWord(__token);
+				if(syn==FAIL)
+					syn=IDENTIFIER;
+				else
+					syn=RESERVEWORD;
+			}
+			else if(isNumber(temp))
+			{
+				int PointCnt=0;
+				while(isNumber(temp))
+				{
+					__token+=temp;
+					++ptr;
+					temp=source[ptr];
+					if(temp=='.' && !PointCnt)
+					{
+						++PointCnt;
+						__token+=temp;
+						++ptr;
+						temp=source[ptr];
+					}
+				}
+				syn=NUMBER;
+			}
+			else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' ||
+					temp=='}' || temp==',' || temp==';' || temp=='|' || temp==':' ||
+					temp=='?' || temp=='.' || temp=='`' || temp=='\'' || temp=='&'||
+					temp=='%' || temp=='$' || temp=='^')
+			{
+				__token+=temp;
+				++ptr;
+				syn=OPERATOR;
+			}
+			else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' || temp=='/' || temp=='<' || temp=='>' || temp=='~')
+			{
+				syn=OPERATOR;
+				__token+=temp;
+				++ptr;
+				temp=source[ptr];
+				if(temp=='=')
+				{
+					__token+=temp;
+					++ptr;
+				}
+			}
+			else if(temp=='\\')
+			{
+				syn=OPERATOR;
+				__token+=temp;
+				++ptr;
+				temp=source[ptr];
+				if(temp=='=' || temp=='n' || temp=='t' || temp=='r' || temp=='\\' || temp=='\'' || temp=='\"')
+				{
+					__token+=temp;
+					++ptr;
+				}
+			}
+			else if(temp=='\"')
+			{
+				syn=STRING;
+				__token+=temp;
+				++ptr;
+				temp=source[ptr];
+				while(temp!='\"')
+				{
+					if(temp=='\\')
+					{
+						__token+=temp;
+						
+						++ptr;
+						temp=source[ptr];
+						__token+=temp;
+						
+						++ptr;
+						temp=source[ptr];
+					}
+					else
+					{
+						__token+=temp;
+						++ptr;
+						temp=source[ptr];
+					}
+					if(temp==0 || temp=='\n')
+						break;
+				}
+				//add the last char \"
+				if(temp=='\"')
+				{
+					__token+=temp;
+					++ptr;
+				}
+				else
+					__token+=" __missing_end_of_string";
+			}
+			else if(temp==0)
+			{
+				syn=SCANEND;
+				return;
+			}
+			else
+			{
+				syn=FAIL;
+				std::cout<<">>[Error] Unexpected error occurred: "<<temp<<std::endl;
+				system("pause");
+				++ptr;
+				return;
+			}
+			if(__token=="")
+			{
+				syn=ERRORFOUND;
+				std::cout<<">>[Error] Cannot identify "<<std::endl;
+			}
+			return;
+		}
+		void lexer_process(const char *source)
+		{
+			std::cout<<">>[Lexer] max size: "<<lexer.max_size()<<" ."<<std::endl;
+			lexer.clear();
+			int syn=0;//token type
+			int ptr=0;//pointer to one char in ResourcePrograme
+			int line=1;
+			std::string __token;
+			token temp;
+			while(syn!=SCANEND && syn!=ERRORFOUND)
+			{
+				scanner(syn,source,__token,ptr,line);
+				if(syn>0)//all Syn type is larger than zero
+				{
+					temp.line=line;
+					temp.type=syn;
+					temp.content=__token;
+					lexer.push_back(temp);
+				}
+			}
+			std::cout<<">>[Lexer] Complete scanning."<<std::endl;
+			return;
+		}
+		void print_lexer()
+		{
+			token temp;
+			for(std::list<token>::iterator i=lexer.begin();i!=lexer.end();++i)
+			{
+				temp=*i;
+				std::cout<<"line "<<temp.line<<": ";
+				if(temp.type==OPERATOR)
+					std::cout<<"( Operator     | ";
+				else if(temp.type==IDENTIFIER)
+					std::cout<<"( Identifier   | ";
+				else if(temp.type==NUMBER)
+					std::cout<<"( Number       | ";
+				else if(temp.type==RESERVEWORD)
+					std::cout<<"( ReserveWord  | ";
+				else if(temp.type==STRING)
+					std::cout<<"( String       | ";
+				std::cout<<temp.content<<" )"<<std::endl;
+			}
+			return;
+		}
+		std::list<token>& return_list()
+		{
+			return lexer;
+		}
+};
+		
+
+		
+
+#endif
diff --git a/version0.6/nasal_parser.h b/version0.6/nasal_parser.h
new file mode 100644
index 0000000..aa547a0
--- /dev/null
+++ b/version0.6/nasal_parser.h
@@ -0,0 +1,62 @@
+#ifndef __NASAL_PARSER_H__
+#define __NASAL_PARSER_H__
+
+#include <cstring>
+#include <stack>
+#include <list>
+#include <queue>
+
+struct parse_unit
+{
+	int line;
+	std::string content;
+};
+
+class nasal_parser
+{
+	private:
+		std::stack<parse_unit> parser;
+	public:
+		void parse_process(std::list<token>& lexer)
+		{
+			for(std::list<token>::iterator i=lexer.begin();i!=lexer.end();++i)
+			{
+				parse_unit temp;
+				temp.line=(*i).line;
+				temp.content=(*i).content;
+				parser.push(temp);
+			}
+			std::cout<<">>[Parser] Complete scanning."<<std::endl;
+			return;
+		}
+		void print_parser()
+		{
+			std::stack<parse_unit> temp;
+			while(!parser.empty())
+			{
+				temp.push(parser.top());
+				parser.pop();
+			}
+			int nowline=0;
+			if(temp.empty())
+			{
+				std::cout<<">>[Parser] Empty stack."<<std::endl;
+				return;
+			}
+			while(!temp.empty())
+			{
+				if(temp.top().line==nowline)
+					std::cout<<temp.top().content<<" ";
+				else
+				{
+					nowline=temp.top().line;
+					std::cout<<std::endl<<"line "<<nowline<<": "<<temp.top().content<<" ";
+				}
+				temp.pop();
+			}
+			std::cout<<std::endl;
+			return;
+		}
+};
+
+#endif