PAL.C.T MINI SHELL
%{
/*
* phpdbg_parser.y
* (from php-src root)
* flex sapi/phpdbg/dev/phpdbg_lexer.l
* bison sapi/phpdbg/dev/phpdbg_parser.y
*/
#include "phpdbg.h"
#include "phpdbg_cmd.h"
#include "phpdbg_utils.h"
#include "phpdbg_cmd.h"
#include "phpdbg_prompt.h"
#define YYSTYPE phpdbg_param_t
#include "phpdbg_parser.h"
#include "phpdbg_lexer.h"
#undef yyerror
static int yyerror(const char *msg);
ZEND_EXTERN_MODULE_GLOBALS(phpdbg);
#ifdef _MSC_VER
#define YYMALLOC malloc
#define YYFREE free
#endif
%}
%pure-parser
%error-verbose
%code requires {
#include "phpdbg.h"
#ifndef YY_TYPEDEF_YY_SCANNER_T
#define YY_TYPEDEF_YY_SCANNER_T
typedef void* yyscan_t;
#endif
}
%output "sapi/phpdbg/phpdbg_parser.c"
%defines "sapi/phpdbg/phpdbg_parser.h"
%token T_EVAL "eval"
%token T_RUN "run"
%token T_SHELL "shell"
%token T_IF "if (condition)"
%token T_TRUTHY "truthy (true, on, yes or enabled)"
%token T_FALSY "falsy (false, off, no or disabled)"
%token T_STRING "string (some input, perhaps)"
%token T_COLON ": (colon)"
%token T_DCOLON ":: (double colon)"
%token T_POUND "# (pound sign followed by digits)"
%token T_SEPARATOR "# (pound sign)"
%token T_PROTO "protocol (file://)"
%token T_DIGITS "digits (numbers)"
%token T_LITERAL "literal (string)"
%token T_ADDR "address"
%token T_OPCODE "opcode"
%token T_ID "identifier (command or function name)"
%token T_INPUT "input (input string or data)"
%token T_UNEXPECTED "input"
%token T_REQ_ID "request id (-r %d)"
%% /* Rules */
input
: command { $$ = $1; }
| input T_SEPARATOR command { phpdbg_stack_separate($1.top); $$ = $3; }
| /* nothing */
;
command
: parameters { $$.top = PHPDBG_G(parser_stack)->top; }
| full_expression { phpdbg_stack_push(PHPDBG_G(parser_stack), &$1); $$.top = PHPDBG_G(parser_stack)->top; }
;
parameters
: parameter { phpdbg_stack_push(PHPDBG_G(parser_stack), &$1); $$.top = PHPDBG_G(parser_stack)->top; }
| parameters parameter { phpdbg_stack_push(PHPDBG_G(parser_stack), &$2); $$.top = PHPDBG_G(parser_stack)->top; }
| parameters req_id { $$ = $1; }
;
parameter
: T_ID T_COLON T_DIGITS {
$$.type = FILE_PARAM;
$$.file.name = $2.str;
$$.file.line = $3.num;
}
| T_ID T_COLON T_POUND T_DIGITS {
$$.type = NUMERIC_FILE_PARAM;
$$.file.name = $1.str;
$$.file.line = $4.num;
}
| T_PROTO T_ID T_COLON T_DIGITS {
$$.type = FILE_PARAM;
$$.file.name = malloc($1.len + $2.len + 1);
if ($$.file.name) {
memcpy(&$$.file.name[0], $1.str, $1.len);
memcpy(&$$.file.name[$1.len], $2.str, $2.len);
$$.file.name[$1.len + $2.len] = '\0';
}
$$.file.line = $4.num;
}
| T_PROTO T_ID T_COLON T_POUND T_DIGITS {
$$.type = NUMERIC_FILE_PARAM;
$$.file.name = malloc($1.len + $2.len + 1);
if ($$.file.name) {
memcpy(&$$.file.name[0], $1.str, $1.len);
memcpy(&$$.file.name[$1.len], $2.str, $2.len);
$$.file.name[$1.len + $2.len] = '\0';
}
$$.file.line = $5.num;
}
| T_ID T_DCOLON T_ID {
$$.type = METHOD_PARAM;
$$.method.class = $1.str;
$$.method.name = $3.str;
}
| T_ID T_DCOLON T_ID T_POUND T_DIGITS {
$$.type = NUMERIC_METHOD_PARAM;
$$.method.class = $1.str;
$$.method.name = $3.str;
$$.num = $5.num;
}
| T_ID T_POUND T_DIGITS {
$$.type = NUMERIC_FUNCTION_PARAM;
$$.str = $1.str;
$$.len = $1.len;
$$.num = $3.num;
}
| T_IF T_INPUT {
$$.type = COND_PARAM;
$$.str = $2.str;
$$.len = $2.len;
}
| T_OPCODE { $$ = $1; }
| T_ADDR { $$ = $1; }
| T_LITERAL { $$ = $1; }
| T_TRUTHY { $$ = $1; }
| T_FALSY { $$ = $1; }
| T_DIGITS { $$ = $1; }
| T_ID { $$ = $1; }
;
req_id
: T_REQ_ID { PHPDBG_G(req_id) = $1.num; }
| /* empty */
;
full_expression
: T_EVAL req_id T_INPUT {
$$.type = EVAL_PARAM;
$$.str = $3.str;
$$.len = $3.len;
}
| T_SHELL req_id T_INPUT {
$$.type = SHELL_PARAM;
$$.str = $3.str;
$$.len = $3.len;
}
| T_RUN req_id {
$$.type = RUN_PARAM;
$$.len = 0;
}
| T_RUN req_id T_INPUT {
$$.type = RUN_PARAM;
$$.str = $3.str;
$$.len = $3.len;
}
;
%%
static int yyerror(const char *msg) {
phpdbg_error("command", "type=\"parseerror\" msg=\"%s\"", "Parse Error: %s", msg);
{
const phpdbg_param_t *top = PHPDBG_G(parser_stack);
while (top) {
phpdbg_param_debug(top, "--> ");
top = top->next;
}
}
return 0;
}
int phpdbg_do_parse(phpdbg_param_t *stack, char *input) {
if (!*input) {
return 0;
}
phpdbg_init_lexer(stack, input);
return yyparse();
}
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