Bison Syntax Error Unexpected End Of File
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Syntax Error Unexpected End Of File Php
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Syntax Error Unexpected End Of File Bash
up bison end of file up vote 8 down vote favorite 3 If i forget to put an empty line at the end of any of my files my program gets a syntax error. The problem is my grammar expects a
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newline to end the current line. Since a newline doesnt exist bison generates a syntax error bc it does not finish the rule. How do i solve this? I tried making <> return MY_EOF BUT when i do that lex crashes a horrible death. I guess theres code in its default EOF that i am not calling. and i have no idea what functions they may be. Using EOF create the error symbol EOF is used, but is not defined as a token syntax error unexpected end of file bash script and has no rules yacc bison lex eof share|improve this question asked Nov 18 '09 at 14:14 acidzombie24 42.6k136454813 add a comment| 4 Answers 4 active oldest votes up vote 11 down vote accepted You could use a flex EOF rule to append a newline to the input: <
here for a quick overview of the site Help Center Detailed answers to any questions you might syntax error unexpected end of file shell script have Meta Discuss the workings and policies of this site About syntax error unexpected end of file python Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads syntax error unexpected end of file unix with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million http://stackoverflow.com/questions/1756275/bison-end-of-file programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Flex/bison syntax error up vote 4 down vote favorite 4 I am trying to write a grammar which will be able to consume the following input: begin #this is a example x = 56; while x > 0 do begin http://stackoverflow.com/questions/19743313/flex-bison-syntax-error point 15.6 78.96; end; end; Here is the lexer.l file: %option noyywrap %{ #include "parser.h" #include
yacc input file.This is my code%{ #include "stdio.h" #include "string.h" #include "exph.asc" %} %union { int value; struct symtab *symlink; } %token NAME https://www.quora.com/Why-is-yacc-giving-this-error-unexpected-end-of-file %token EXPR %% x : x dot | x p | x index | x b ; b : '[' EXPR ']' b1 | Ɛ ; b1 : '[' https://panthema.net/2007/flex-bison-cpp-example/flex-bison-cpp-example-0.1.4/doxygen-html/ EXPR ']' Ɛ ; dot : '.' NAME { $$= $2->value; $2->initialized = YES; } ; index : '[' EXPR ':' EXPR ']' ; p : '(' p | NAME syntax error p1 { $$= $1->value; } ; p1 : ',' p | ')' | Ɛ ; x : NAME { $$= $1->value; $1->initialized = YES; } ; %% struct symtab *symlook(char *str) { char *p; struct symtab *sp; for(sp = symtab; sp< &symtab[MAX_SYM]; sp++){ if(sp->name && !strcmp(sp->name,str)) /* return pointer */ return sp; if(!sp->name) { /* create new variable */ sp->name end of file = strdup(str); sp->initialized = NO; return sp; } } } main() { return(yyparse()); } yyerror(s) char *s; { fprintf(stderr, "%s\n",s); } yywrap() { return(1); }when I compile this code using yacc ,I get this erroryacc: e - line 1 of "expy.asc", unexpected end-of-filecan anyone help me where I am making mistake ?UpdateCancelAnswer Wiki1 Answer Robert Wagner, Writes beautiful codeWritten 152w agoYou need to include the definition of symtab:#include "parser.h"605 Views · View Upvotes · Answer requested by SKView More AnswersRelated QuestionsWhat is yacc tool?978 ViewsCompilers: What all kinds of errors can one correct in a C program using lex and yacc?3,324 ViewsWhat is yacc?589 ViewsHas anybody used Lex and Yacc to write compiler/interpreter of their own. Is there any popular language/script whose compiler source was gener...2,653 ViewsWhat is yytext in yacc?610 ViewsCould we compile lex and yacc C programs in a Unix environment?903 ViewsWhat is the output of YACC?1,405 ViewsWhat is the meaning of "reached end of file while parsing"? Why does this error occur?311 ViewsIs there any open source Lex/Yacc parser for parsing VRML 2.0 files?
and parser are fully re-entrant, because all state variables are contained in the class objects. Furthermore multiple different lexer-parser pairs can easily be linked into one binary, because they have different class names and/or are located in a different namespace. Website / License The current example package can be downloaded from http://idlebox.net/2007/flex-bison-cpp-example/ The following just mean you can copy the example code into your program or use it for whatever purpose without crediting me (though I would really like it if you did): The parts of the example code written by myself are released into the public domain or, at your option, under the Do What The Fuck You Want To Public License (WTFPL), which can be found in the file COPYING. There are some special GPL license exceptions for the included source files from the Bison and Flex distributions. The idea and method of this example is based on code from http://ioctl.org/jan/bison/ Why Use These Old Tools? Well, they are here to stay and they work well. These days there are much more sophisticated C++ parser generation frameworks around: Most well-known is the Boost.Spirit parser framework and the ANTLR parser generator. Less well known is the Common Text Transformation Library. All these libraries do good jobs when you need to generate parsers for more difficult grammars. However if you write a program with one of the frameworks above, then your users need that parser framework installed to compile your program. But Flex and Bison require no compile-time dependencies, because they generate fully autonomous source code. (And Flex and Bison are installed almost everywhere.) So far I have not found any modern parser generator which outputs independent code. It is even possible to compile the generated source with Visual C++ on Windows (worked with 8.0 aka 2005). Flex and Bison need not be installed on the windows machine.