// Grammar definition for arithmetic expressions %start expression %tokenNUMBER %left '+' '-' %left '*' '/' %left UMINUS %% expression: expression '+' expression | expression '-' expression | expression '*' expression | expression '/' expression | '-' expression %prec UMINUS | '(' expression ')' | NUMBER ; %% // Sample input: "3 + 4 * (5 - 2)" int main() { yylex_init(); yy_scan_string("3 + 4 * (5 - 2)"); yyparse(); yylex_destroy(); return 0; }
// Grammar definition for variables and assignments in JavaScript grammar JavaScript; program : statement* EOF ; statement : variableDeclaration ';' | assignment ';' ; variableDeclaration : 'var' ID ; assignment : ID '=' expression ; expression : ID | INT | 'true' | 'false' | '(' expression ')' | expression ('+'|'-'|'*'|'/') expression ; ID : [a-zA-Z]+ ; INT : [0-9]+ ; WS : [ \t\r\n]+ -> skip ;After generating the C++ code from this grammar definition, the resulting parser can be used to analyze and transform valid JavaScript code. Overall, C++ parser libraries are valuable tools for performing language analysis and can be used for a variety of purposes including compiler development, code optimization, and IDE tooling.