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let.y
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let.y
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%{
#define YYSTYPE ngx_let_node_t*
#include "let.h"
#include "let.tab.h"
#include <ngx_http.h>
static ngx_conf_t *conf;
static unsigned inpos;
static ngx_let_node_t *result;
int yylex();
void yyerror(char *s) {
ngx_str_t* token = conf->args->elts;
if (inpos < conf->args->nelts)
token += inpos;
else
token = 0;
ngx_log_debug(NGX_LOG_INFO, conf->log, 0,
"error parsing let expression: %s[%d]: %*s", s, inpos,
token ? token->len : 0, token ? (char*)token->data : "");
yylval = NULL;
}
ngx_let_node_t* ngx_let_binop_node_create(
ngx_let_node_t* left,
char op,
ngx_let_node_t* right)
{
ngx_let_node_t** args;
ngx_let_node_t* node;
node = ngx_pcalloc(conf->pool, sizeof(ngx_let_node_t));
node->type = NGX_LTYPE_OPERATION;
node->index = op;
ngx_array_init(&node->args, conf->pool, 2, sizeof(ngx_let_node_t*));
args = ngx_array_push_n(&node->args, 2);
args[0] = left;
args[1] = right;
/* yylval = node;*/
ngx_log_debug(NGX_LOG_INFO, conf->log, 0, "let operation reduce '%c'", op);
return node;
}
ngx_let_node_t* ngx_let_fun_arg(
ngx_let_node_t* fun,
ngx_let_node_t* arg)
{
ngx_let_node_t** args;
if (!fun->args.nalloc)
ngx_array_init(&fun->args, conf->pool, 1, sizeof(ngx_let_node_t*));
args = ngx_array_push(&fun->args);
*args = arg;
ngx_log_debug(NGX_LOG_INFO, conf->log, 0, "let function argument: %d : %d", fun->type, arg->type);
/* yylval = fun;*/
return fun;
}
%}
%%
%token NGXLEAF NGXFUNC NGXFUNC0 NGXDONE;
%left '+' '-' ;
%left '*' '/' '%' '.' ;
%left '&' '|' ;
letexpr : expr NGXDONE { result = $1; YYACCEPT; }
expr: '(' expr ')' { $$ = $2; }
| NGXLEAF
| NGXFUNC0
| funopen ')'
| expr '*' expr { $$ = ngx_let_binop_node_create($1, '*', $3); }
| expr '/' expr { $$ = ngx_let_binop_node_create($1, '/', $3); }
| expr '%' expr { $$ = ngx_let_binop_node_create($1, '%', $3); }
| expr '+' expr { $$ = ngx_let_binop_node_create($1, '+', $3); }
| expr '-' expr { $$ = ngx_let_binop_node_create($1, '-', $3); }
| expr '&' expr { $$ = ngx_let_binop_node_create($1, '&', $3); }
| expr '|' expr { $$ = ngx_let_binop_node_create($1, '|', $3); }
| expr '.' expr { $$ = ngx_let_binop_node_create($1, '.', $3); }
;
funopen: NGXFUNC
| funopen expr { $$ = ngx_let_fun_arg($1, $2); }
;
%%
int yylex() {
ngx_str_t* str;
ngx_let_node_t* node;
++inpos;
if (conf == NULL
|| conf->args == NULL
|| conf->args->nelts <= inpos)
{
return NGXDONE;
}
str = ((ngx_str_t*)conf->args->elts + inpos);
if (str->len == 1 && strchr("+-*/%&|.()", str->data[0])) {
/* terminal */
yylval = 0;
ngx_log_debug(NGX_LOG_INFO, conf->log, 0, "let terminal '%c'", str->data[0]);
return str->data[0];
}
node = ngx_pcalloc(conf->pool, sizeof(ngx_let_node_t));
yylval = node;
if (str->len > 1 && str->data[0] == '$') {
/* variable */
ngx_log_debug(NGX_LOG_INFO, conf->log, 0, "let variable %*s", str->len, str->data);
str->data++;
str->len--;
if (str->data[0] >= '1' && str->data[0] <= '9') {
node->type = NGX_LTYPE_CAPTURE;
node->index = str->data[0] - '0';
} else {
node->type = NGX_LTYPE_VARIABLE;
node->index = ngx_http_get_variable_index(conf, str);
}
return NGXLEAF;
} else if (str->len > 2 && str->data[str->len - 2] == '('
&& str->data[str->len - 1] == ')') {
/* function w/o arguments*/
ngx_log_debug(NGX_LOG_INFO, conf->log, 0, "let function0 %*s", str->len - 1, str->data);
node->type = NGX_LTYPE_FUNCTION;
node->name = *str;
node->name.len -= 2;
return NGXFUNC0;
} else if (str->len > 1 && str->data[str->len - 1] == '(' ) {
/* function */
ngx_log_debug(NGX_LOG_INFO, conf->log, 0, "let function %*s", str->len - 1, str->data);
node->type = NGX_LTYPE_FUNCTION;
node->name = *str;
node->name.len--;
return NGXFUNC;
} else {
/* literal */
ngx_log_debug(NGX_LOG_INFO, conf->log, 0, "let literal %*s", str->len, str->data);
node->type = NGX_LTYPE_LITERAL;
node->name = *str;
return NGXLEAF;
}
}
ngx_let_node_t* ngx_parse_let_expr(ngx_conf_t* cf) {
conf = cf;
inpos = 1; /* #1 is dest variable */
result = 0;
yyparse();
return result;
}