c# - 解析器生成器 : How to use GPLEX and GPPG together?

Question

在浏览了优秀的 C# 解析器生成器的帖子后，我偶然发现了 GPLEX 和 GPPG。我想使用 GPLEX 为 GPPG 生成 token 以解析和创建树(类似于 lex/yacc 关系)。但是，我似乎找不到关于这两者如何相互作用的示例。使用 lex/yacc，lex 返回由 yacc 定义的标记，并且可以将值存储在 yylval 中。这在 GPLEX/GPPG 中是如何完成的(他们的文档中没有)？

附件是我想转换成 GPLEX 的 lex 代码:

%{
 #include <stdio.h>
 #include "y.tab.h"
%}
%%
[Oo][Rr]                return OR;
[Aa][Nn][Dd]            return AND;
[Nn][Oo][Tt]            return NOT;
[A-Za-z][A-Za-z0-9_]*   yylval=yytext; return ID;
%%

谢谢!安德鲁

Answer 1

首先:在您的项目中包含引用“QUT.ShiftReduceParser.dll”。它在 GPLEX 的下载包中提供。

主程序示例代码:

using System;
using ....;
using QUT.Gppg;
using Scanner;
using Parser;

namespace NCParser
{
class Program
{
    static void Main(string[] args)
    {
        string pathTXT = @"C:\temp\testFile.txt";
        FileStream file = new FileStream(pathTXT, FileMode.Open);
        Scanner scanner = new Scanner();
        scanner.SetSource(file, 0);
        Parser parser = new Parser(scanner);            
    }
}
}    

GPLEX 示例代码:

%using Parser;           //include the namespace of the generated Parser-class
%Namespace Scanner       //names the Namespace of the generated Scanner-class
%visibility public       //visibility of the types "Tokens","ScanBase","Scanner"
%scannertype Scanner     //names the Scannerclass to "Scanner"
%scanbasetype ScanBase   //names the Scanbaseclass to "ScanBase"
%tokentype Tokens        //names the Tokenenumeration to "Tokens"

%option codePage:65001 out:Scanner.cs /*see the documentation of GPLEX for further Options you can use */

%{ //user-specified code will be copied in the Output-file
%}

OR [Oo][Rr]
AND [Aa][Nn][Dd]
Identifier [A-Za-z][A-Za-z0-9_]*

%% //Rules Section
%{ //user-code that will be executed before getting the next token
%}

{OR}           {return (int)Tokens.kwAND;}
{AND}          {return (int)Tokens.kwAND;}
{Identifier}   {yylval = yytext; return (int)Tokens.ID;}

%% //User-code Section

GPPG 输入文件的示例代码:

%using Scanner      //include the Namespace of the scanner-class
%output=Parser.cs   //names the output-file
%namespace Parser  //names the namespace of the Parser-class

%parsertype Parser      //names the Parserclass to "Parser"
%scanbasetype ScanBase  //names the ScanBaseclass to "ScanBase"
%tokentype Tokens       //names the Tokensenumeration to "Tokens"

%token kwAND "AND", kwOR "OR" //the received Tokens from GPLEX
%token ID

%% //Grammar Rules Section

program  : /* nothing */
         | Statements
         ;

Statements : EXPR "AND" EXPR
           | EXPR "OR" EXPR
           ;

EXPR : ID
     ;

%% User-code Section
// Don't forget to declare the Parser-Constructor
public Parser(Scanner scnr) : base(scnr) { }

c# parse gppg gplex