Bison Syntax Error Unexpected $undefined Expecting
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Syntax Error Unexpected Tidentifier Expecting
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Syntax Error Unexpected T_string Expecting
$undefined expecting $end error up vote 2 down vote favorite Hi I have started leaning Bison parser generator. I tried the following program. I compiled and running the program using MinGW on Window 7, with mintty client terminal. Bison version is 2.4.2 %verbose %error-verbose %{ #include
Syntax Error Unexpected T_string Expecting T_variable In
INT { $$ = $1; printf("value : %d %d %d %d\n", $1, @1.first_line, @1.first_column, @1.last_column); } ; %% int main() { yyparse(); return 0; } int yylex() { char ch = getchar(); if(isdigit(ch)) { ungetc(ch, stdin); scanf("%d", &yylval); return INT; } return ch; } int yyerror(const char *msg) { printf("Error : %s\n", msg); } I compiled the program with bison filename.y then gcc filename.tab.c and when I try to run the program and enter 5 in stdin, I am getting the following error as it is printed from yyerror function. Can anyone help me find what I am doing wrong. Error : syntax error, unexpected $undefined, expecting $end c parsing bison share|improve this question edited Feb 28 at 18:21 asked Feb 28 at 18:10 Dinesh 573820 I recommend to use flex as lexer. Bison and flex complement each other very well. –Ctx Feb 28 at 20:55 add a comment| 1 Answer 1 active oldest votes up vote 4 down vote accepted When your lexer reads the \n (newline) character after the number you entered, it returns it to your parser, which doesn't recognize it as anything, so you get the unexpected $unde
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Syntax Error Unexpected T_string Expecting T_old_function Or T_function Or T_var
Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community syntax error unexpected end expecting of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Bison unexpected indentifier error up vote 0 down vote favorite %{ #include
"syntax error", and similarly for overflow message Date: Fri, 15 Nov 2002 13:00:07 -0800 I installed the following patch to fix Bison https://lists.gnu.org/archive/html/bison-patches/2002-11/msg00103.html to conform to POSIX (in one case) and to its documentation (in the other). 2002-11-15 Paul Eggert
* data/glr.c, data/lalr1.cc, data/yacc.cc, doc/bison.texinfo, src/conflicts.c, src/parse-gram.y, src/tables.c, src/tables.h, tests/action.at, tests/calc.at, tests/conflicts.at, tests/cxx-type.at, tests/regression.at: "parse error" -> "syntax error" for POSIX compatibility. "parsing stack overflow..." -> "parser stack overflow" so that syntax error code matches Bison documentation. --- NEWS.~1.77.~ 2002-11-14 14:28:42.000000000 -0800 +++ NEWS 2002-11-15 12:28:12.000000000 -0800 @@ -2,6 +2,15 @@ Bison News ---------- Changes in version 1.75c: +* "parse error" -> "syntax error" + Bison now uniformly uses the term "syntax error"; formerly, the code + and manual sometimes used the syntax error unexpected term "parse error" instead. POSIX + requires "syntax error" in diagnostics, and it was thought better to + be consistent. + +* "parsing stack overflow..." -> "parser stack overflow" + GLR parsers now report "parser stack overflow" as per the Bison manual. + * GLR and inline Users of Bison have to decide how they handle the portability of the C keyword `inline'. Index: data/glr.c =================================================================== RCS file: /cvsroot/bison/bison/data/glr.c,v retrieving revision 1.37 diff -p -u -r1.37 glr.c --- data/glr.c 14 Nov 2002 23:18:55 -0000 1.37 +++ data/glr.c 15 Nov 2002 20:24:02 -0000 @@ -360,7 +360,7 @@ static const ]b4_int_type_for([b4_pgoto] /* YYTABLE[YYPACT[STATE-NUM]]. What to do in state STATE-NUM. If positive, shift that token. If negative, reduce the rule which number is the opposite. If zero, do what YYDEFACT says. - If YYTABLE_NINF, parse error. */ + If YYTABLE_NINF, syntax error. */ #define YYTABLE_NINF ]b4_table_ninf[ static const ]b4_int_type_for([b4_table]