xref: /PHP-7.1/sapi/phpdbg/phpdbg_parser.y (revision 417a8ef6)
1 %{
2 
3 /*
4  * phpdbg_parser.y
5  * (from php-src root)
6  * flex sapi/phpdbg/dev/phpdbg_lexer.l
7  * bison sapi/phpdbg/dev/phpdbg_parser.y
8  */
9 
10 #include "phpdbg.h"
11 #include "phpdbg_cmd.h"
12 #include "phpdbg_utils.h"
13 #include "phpdbg_cmd.h"
14 #include "phpdbg_prompt.h"
15 
16 #define YYSTYPE phpdbg_param_t
17 
18 #include "phpdbg_parser.h"
19 #include "phpdbg_lexer.h"
20 
21 #undef yyerror
22 static int yyerror(const char *msg);
23 
24 ZEND_EXTERN_MODULE_GLOBALS(phpdbg)
25 
26 #ifdef _MSC_VER
27 #define YYMALLOC malloc
28 #define YYFREE free
29 #endif
30 
31 %}
32 
33 %pure-parser
34 %error-verbose
35 
36 %code requires {
37 #include "phpdbg.h"
38 #ifndef YY_TYPEDEF_YY_SCANNER_T
39 #define YY_TYPEDEF_YY_SCANNER_T
40 typedef void* yyscan_t;
41 #endif
42 }
43 
44 %output  "sapi/phpdbg/phpdbg_parser.c"
45 %defines "sapi/phpdbg/phpdbg_parser.h"
46 
47 %token T_EVAL       "eval"
48 %token T_RUN        "run"
49 %token T_SHELL      "shell"
50 %token T_IF         "if (condition)"
51 %token T_TRUTHY     "truthy (true, on, yes or enabled)"
52 %token T_FALSY      "falsy (false, off, no or disabled)"
53 %token T_STRING     "string (some input, perhaps)"
54 %token T_COLON      ": (colon)"
55 %token T_DCOLON     ":: (double colon)"
56 %token T_POUND      "# (pound sign followed by digits)"
57 %token T_SEPARATOR  "# (pound sign)"
58 %token T_PROTO      "protocol (file://)"
59 %token T_DIGITS     "digits (numbers)"
60 %token T_LITERAL    "literal (string)"
61 %token T_ADDR       "address"
62 %token T_OPCODE     "opcode"
63 %token T_ID         "identifier (command or function name)"
64 %token T_INPUT      "input (input string or data)"
65 %token T_UNEXPECTED "input"
66 %token T_REQ_ID     "request id (-r %d)"
67 
68 %% /* Rules */
69 
70 input
71 	: command { $$ = $1; }
72 	| input T_SEPARATOR command { phpdbg_stack_separate($1.top); $$ = $3; }
73 	| /* nothing */
74 	;
75 
76 command
77 	: parameters { $$.top = PHPDBG_G(parser_stack)->top; }
78 	| full_expression { phpdbg_stack_push(PHPDBG_G(parser_stack), &$1); $$.top = PHPDBG_G(parser_stack)->top; }
79 	;
80 
81 parameters
82 	: parameter { phpdbg_stack_push(PHPDBG_G(parser_stack), &$1); $$.top = PHPDBG_G(parser_stack)->top; }
83 	| parameters parameter { phpdbg_stack_push(PHPDBG_G(parser_stack), &$2); $$.top = PHPDBG_G(parser_stack)->top; }
84 	| parameters req_id { $$ = $1; }
85 	;
86 
87 parameter
88 	: T_ID T_COLON T_DIGITS {
89 		$$.type = FILE_PARAM;
90 		$$.file.name = $2.str;
91 		$$.file.line = $3.num;
92 	}
93 	| T_ID T_COLON T_POUND T_DIGITS {
94 		$$.type = NUMERIC_FILE_PARAM;
95 		$$.file.name = $1.str;
96 		$$.file.line = $4.num;
97 	}
98 	| T_PROTO T_ID T_COLON T_DIGITS {
99 		$$.type = FILE_PARAM;
100 		$$.file.name = malloc($1.len + $2.len + 1);
101 		if ($$.file.name) {
102 			memcpy(&$$.file.name[0], $1.str, $1.len);
103 			memcpy(&$$.file.name[$1.len], $2.str, $2.len);
104 			$$.file.name[$1.len + $2.len] = '\0';
105 		}
106 		$$.file.line = $4.num;
107 	}
108 	| T_PROTO T_ID T_COLON T_POUND T_DIGITS {
109 		$$.type = NUMERIC_FILE_PARAM;
110 		$$.file.name = malloc($1.len + $2.len + 1);
111 		if ($$.file.name) {
112 			memcpy(&$$.file.name[0], $1.str, $1.len);
113 			memcpy(&$$.file.name[$1.len], $2.str, $2.len);
114 			$$.file.name[$1.len + $2.len] = '\0';
115 		}
116 		$$.file.line = $5.num;
117 	}
118 	| T_ID T_DCOLON T_ID {
119 		$$.type = METHOD_PARAM;
120 		$$.method.class = $1.str;
121 		$$.method.name = $3.str;
122 	}
123 	| T_ID T_DCOLON T_ID T_POUND T_DIGITS {
124 		$$.type = NUMERIC_METHOD_PARAM;
125 		$$.method.class = $1.str;
126 		$$.method.name = $3.str;
127 		$$.num = $5.num;
128 	}
129 	| T_ID T_POUND T_DIGITS {
130 		$$.type = NUMERIC_FUNCTION_PARAM;
131 		$$.str = $1.str;
132 		$$.len = $1.len;
133 		$$.num = $3.num;
134 	}
135 	| T_IF T_INPUT {
136 		$$.type = COND_PARAM;
137 		$$.str = $2.str;
138 		$$.len = $2.len;
139 	}
140 	| T_OPCODE { $$ = $1; }
141 	| T_ADDR { $$ = $1; }
142 	| T_LITERAL { $$ = $1; }
143 	| T_TRUTHY { $$ = $1; }
144 	| T_FALSY { $$ = $1; }
145 	| T_DIGITS { $$ = $1; }
146 	| T_ID { $$ = $1; }
147 	;
148 
149 req_id
150 	: T_REQ_ID { PHPDBG_G(req_id) = $1.num; }
151 	| /* empty */
152 ;
153 
154 full_expression
155 	: T_EVAL req_id T_INPUT {
156 		$$.type = EVAL_PARAM;
157 		$$.str = $3.str;
158 		$$.len = $3.len;
159 	}
160 	| T_SHELL req_id T_INPUT {
161 		$$.type = SHELL_PARAM;
162 		$$.str = $3.str;
163 		$$.len = $3.len;
164 	}
165 	| T_RUN req_id {
166 		$$.type = RUN_PARAM;
167 		$$.len = 0;
168 	}
169 	| T_RUN req_id T_INPUT {
170 		$$.type = RUN_PARAM;
171 		$$.str = $3.str;
172 		$$.len = $3.len;
173 	}
174 	;
175 
176 %%
177 
178 static int yyerror(const char *msg) {
179 	phpdbg_error("command", "type=\"parseerror\" msg=\"%s\"", "Parse Error: %s", msg);
180 
181 	{
182 		const phpdbg_param_t *top = PHPDBG_G(parser_stack);
183 
184 		while (top) {
185 			phpdbg_param_debug(top, "--> ");
186 			top = top->next;
187 		}
188 	}
189 	return 0;
190 }
191 
phpdbg_do_parse(phpdbg_param_t * stack,char * input)192 int phpdbg_do_parse(phpdbg_param_t *stack, char *input) {
193 	if (!*input) {
194 		return 0;
195 	}
196 
197 	if (PHPDBG_G(cur_command)) {
198 		free(PHPDBG_G(cur_command));
199 	}
200 	PHPDBG_G(cur_command) = strdup(input);
201 
202 	phpdbg_init_lexer(stack, input);
203 
204 	return yyparse();
205 }
206