comment ex�cuter un script flex bison
Bonjour
J'ai trouv� 1 script flex bison que je cherche � comprendre et ex�cuter
main.ccp
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| // section1: declaration, option parametres (settings)
//----------------------------------------------------
%{
// declaraction de variables
int chars = 0;
int words = 0;
int line = 0;
%}
%%
// section 2: liste de motifs (pattern) et d'action
//--------------------------------------------------
// motif/pattern action: c code to execute when the pattern mattches
[a-zA-Z]+ {words++; chars += strlen(yytext);} // strlen(): calculer la longueur de la chaîne de caractères
//matches a word updated nbr of words and characters seen
// yytext: - variable
// - point to the input text that the pattern just matched
\n {chars++; lines++;}
// matches a new line updates the number of lines and characteres
. {chars++;}
// regex dot <=> any character
// each pattern at the beginning of a line
// flex considers any line that starts with whitespace to be code to be copied into the generated c program
%% // separateur de section
// section3: code c
//-----------------
int main( int argc, char* args[] )
{
yylex(); // La compilation d'une source flex produit une fonction yylex(). Un appel de yylex() déclanche une analyse lexicale du flux yyin
printf("%8d%8d%8d\n", lines, words, chars);
return 0;
} |
quand je le lance dans visual studio code le message d'erreur suivant appara�t:
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| main2.cpp:1:1: error: expected unqualified-id before '%' token
1 | %{
| ^
main2.cpp:8:1: error: 'LETTRE' does not name a type
8 | LETTRE [a-zA-Z]
| ^~~~~~
main2.cpp:10:18: error: expected unqualified-id before '+' token
10 | MOT {LETTRE}+
| ^
main2.cpp:11:19: error: expected unqualified-id before '+' token
11 | NOMBRE {CHIFFRE}+
| ^
main2.cpp:16:15: error: 'total' does not name a type
16 | {NOMBRE} total+= atoi( yytext );
| ^~~~~
main2.cpp:17:5: error: expected unqualified-id before '{' token
17 | {MOT} if (yyleng > score){
| ^
main2.cpp:17:15: error: expected unqualified-id before 'if'
17 | {MOT} if (yyleng > score){
| ^~
main2.cpp:21:6: error: expected unqualified-id before '.' token
21 | . printf("\nNi mot, ni nombre :%s", yytext);
| ^
main2.cpp:22:5: error: expected unqualified-id before '%' token
22 | %%
| ^ |
Pouvez vous m'aider?
Cordialement
