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|
%{
#include <cstdio>
#include <vector>
#include <string>
#include <cstore/cstore.hpp>
#include <cnode/cnode.hpp>
#include "cparse.hpp"
#include "cparse_def.h"
using namespace cparse;
/* to enable tracing, define ENABLE_PARSER_TRACE. may also want to invoke
* bison with "-v" (by changing Makefile.am).
*/
#undef ENABLE_PARSER_TRACE
#ifdef ENABLE_PARSER_TRACE
#define YYDEBUG 1
#endif // ENABLE_PARSER_TRACE
// stuff from lex
extern "C" {
extern int cparse_lineno;
extern char *cparse_text;
int cparse_lex();
void cparse_set_in(FILE *fin);
}
static void
cparse_error(const char *s)
{
printf("Invalid config file (%s): error at line %d, text [%s]\n",
s, cparse_lineno, cparse_text);
}
static int ndeact = 0;
static char *ncomment = NULL;
static char *nname = NULL;
static char *nval = NULL;
typedef Cstore::MapT<Cpath, CfgNode *, CpathHash> NmapT;
static NmapT node_map;
static Cstore *cstore_ = NULL;
static CfgNode *cur_node = NULL;
static CfgNode *cur_parent = NULL;
static vector<CfgNode *> cur_path;
static Cpath pcomps;
static vector<bool> pcomp_is_value;
static void
add_node()
{
pcomps.push(nname);
CfgNode *onode = NULL;
NmapT::iterator it = node_map.find(pcomps);
if (it != node_map.end()) {
onode = it->second;
}
pcomps.pop();
if (onode) {
if (nval) {
if (onode->isMulti()) {
// a new value for a "multi node"
onode->addMultiValue(nval);
cur_node = onode;
} else if (onode->isTag()) {
// a new value for a "tag node"
cur_node = new CfgNode(pcomps, nname, nval, ncomment, ndeact, cstore_);
onode->addChildNode(cur_node);
} else {
/* a new value for a single-value node => invalid?
* for now, use the newer value.
*/
cur_node = onode;
cur_node->setValue(nval);
}
} else {
// existing intermediate node => move current node pointer
cur_node = onode;
}
} else {
// new node
cur_node = new CfgNode(pcomps, nname, nval, ncomment, ndeact, cstore_);
CfgNode *mapped_node = cur_node;
if (cur_node->isTag() && cur_node->isValue()) {
// tag value => need to add the "tag node" on top
// (need to force "tag" if the node is invalid => tag_if_invalid)
CfgNode *p = new CfgNode(pcomps, nname, NULL, NULL, ndeact, cstore_,
true);
p->addChildNode(cur_node);
mapped_node = p;
}
cur_parent->addChildNode(mapped_node);
pcomps.push(nname);
node_map[pcomps] = mapped_node;
pcomps.pop();
}
}
static void
go_down()
{
cur_path.push_back(cur_parent);
cur_parent = cur_node;
pcomps.push(nname);
pcomp_is_value.push_back(false);
if (nval) {
pcomps.push(nval);
pcomp_is_value.push_back(true);
}
}
static void
go_up()
{
cur_parent = cur_path.back();
cur_path.pop_back();
if (pcomp_is_value.back()) {
pcomps.pop();
pcomp_is_value.pop_back();
}
pcomps.pop();
pcomp_is_value.pop_back();
}
%}
%token NODE
%token VALUE
%token COMMENT
%token LEFTB
%token RIGHTB
%token SYNTAX_ERROR
%%
input: forest comment
;
forest: /* empty */
| forest tree
;
tree: node {
add_node();
}
| node {
add_node();
} LEFTB {
go_down();
} forest comment RIGHTB {
go_up();
}
;
node: nodec {
nval = NULL;
}
| nodec VALUE {
nval = $2.str;
}
;
nodec: NODE {
ncomment = NULL;
nname = $1.str;
ndeact = $1.deactivated;
}
| COMMENT comment NODE {
ncomment = $1.str;
nname = $3.str;
ndeact = $3.deactivated;
}
;
comment: /* empty */
| COMMENT comment
;
%%
CfgNode *
cparse::parse_file(FILE *fin, Cstore& cs)
{
// for debug (see prologue)
#ifdef ENABLE_PARSER_TRACE
cparse_debug = 1;
#endif // ENABLE_PARSER_TRACE
// initial state
cparse_set_in(fin);
cstore_ = &cs;
ndeact = 0;
ncomment = NULL;
nname = NULL;
nval = NULL;
node_map.clear();
pcomps.clear();
pcomp_is_value.clear();
cur_path.clear();
cur_node = NULL;
cur_parent = new CfgNode(pcomps, nname, nval, ncomment, ndeact, cstore_);
if (cparse_parse() != 0) {
// parsing failed
return NULL;
}
if (cur_path.size() > 0) {
// didn't return to top-level => invalid
return NULL;
}
return cur_parent;
}
CfgNode *
cparse::parse_file(const char *fname, Cstore& cs)
{
FILE *fin = fopen(fname, "r");
if (!fin) {
return NULL;
}
return parse_file(fin, cs);
}
|
