lighttpd 1.4.x https://www.lighttpd.net/
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%token_prefix TK_
%token_type {buffer *}
%extra_argument {ssi_ctx_t *ctx}
%name ssiexprparser
%include {
#include "first.h"
#include "mod_ssi_expr.h"
#include "buffer.h"
#include <assert.h>
#include <string.h>
}
%parse_failure {
ctx->ok = 0;
}
%type expr { ssi_val_t * }
%type value { buffer * }
%type exprline { ssi_val_t * }
%type cond { int }
%token_destructor { buffer_free($$); }
%left AND.
%left OR.
%nonassoc EQ NE GT GE LT LE.
%right NOT.
input ::= exprline(B). {
ctx->val.bo = ssi_val_tobool(B);
ctx->val.type = SSI_TYPE_BOOL;
ssi_val_free(B);
}
exprline(A) ::= expr(B) cond(C) expr(D). {
int cmp;
if (B->type == SSI_TYPE_STRING &&
D->type == SSI_TYPE_STRING) {
cmp = strcmp(B->str->ptr, D->str->ptr);
} else {
cmp = ssi_val_tobool(B) - ssi_val_tobool(D);
}
A = B;
switch(C) {
case SSI_COND_EQ: A->bo = (cmp == 0) ? 1 : 0; break;
case SSI_COND_NE: A->bo = (cmp != 0) ? 1 : 0; break;
case SSI_COND_GE: A->bo = (cmp >= 0) ? 1 : 0; break;
case SSI_COND_GT: A->bo = (cmp > 0) ? 1 : 0; break;
case SSI_COND_LE: A->bo = (cmp <= 0) ? 1 : 0; break;
case SSI_COND_LT: A->bo = (cmp < 0) ? 1 : 0; break;
}
A->type = SSI_TYPE_BOOL;
ssi_val_free(D);
}
exprline(A) ::= expr(B). {
A = B;
}
expr(A) ::= expr(B) AND expr(C). {
int e;
e = ssi_val_tobool(B) && ssi_val_tobool(C);
A = B;
A->bo = e;
A->type = SSI_TYPE_BOOL;
ssi_val_free(C);
}
expr(A) ::= expr(B) OR expr(C). {
int e;
e = ssi_val_tobool(B) || ssi_val_tobool(C);
A = B;
A->bo = e;
A->type = SSI_TYPE_BOOL;
ssi_val_free(C);
}
expr(A) ::= NOT expr(B). {
int e;
e = !ssi_val_tobool(B);
A = B;
A->bo = e;
A->type = SSI_TYPE_BOOL;
}
expr(A) ::= LPARAN exprline(B) RPARAN. {
A = B;
}
expr(A) ::= value(B). {
A = ssi_val_init();
A->str = B;
A->type = SSI_TYPE_STRING;
}
value(A) ::= VALUE(B). {
A = B;
}
value(A) ::= value(B) VALUE(C). {
A = B;
buffer_append_string_buffer(A, C);
buffer_free(C);
}
cond(A) ::= EQ. { A = SSI_COND_EQ; }
cond(A) ::= NE. { A = SSI_COND_NE; }
cond(A) ::= LE. { A = SSI_COND_LE; }
cond(A) ::= GE. { A = SSI_COND_GE; }
cond(A) ::= LT. { A = SSI_COND_LT; }
cond(A) ::= GT. { A = SSI_COND_GT; }