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dapparse.c
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dapparse.c
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/* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc.
See the COPYRIGHT file for more information.
*/
#include "config.h"
#include "dapparselex.h"
#include "dapy.h"
/* Forward */
static void addedges(OCnode* node);
static void setroot(OCnode*,NClist*);
static int isglobalname(const char* name);
static int isdodsname(const char* name);
static OCnode* newocnode(char* name, OCtype octype, DAPparsestate* state);
static OCtype octypefor(Object etype);
static NClist* scopeduplicates(NClist* list);
static int check_int32(char* val, long* value);
/****************************************************/
/* Switch to DAS parsing SCAN_WORD definition */
/* Use the initial keyword to indicate what we are parsing */
void
dap_tagparse(DAPparsestate* state, int kind)
{
switch (kind) {
case SCAN_DATASET:
case SCAN_ERROR:
break;
case SCAN_ATTR:
dapsetwordchars(state->lexstate,1);
break;
default:
fprintf(stderr,"tagparse: Unknown tag argument: %d\n",kind);
}
}
Object
dap_datasetbody(DAPparsestate* state, Object name, Object decls)
{
OCnode* root = newocnode((char*)name,OC_Dataset,state);
char* dupname = NULL;
NClist* dups = scopeduplicates((NClist*)decls);
if(dups != NULL) {
/* Sometimes, some servers (i.e. Thredds)
return a dds with duplicate field names
at the dataset level; simulate an errorbody response
*/
ocnodes_free(dups);
dap_parse_error(state,"Duplicate dataset field names: %s",name,dupname);
state->error = OC_ENAMEINUSE;
return (Object)NULL;
}
root->subnodes = (NClist*)decls;
OCASSERT((state->root == NULL));
state->root = root;
state->root->root = state->root; /* make sure to cross link */
addedges(root);
setroot(root,state->ocnodes);
return NULL;
}
Object
dap_attributebody(DAPparsestate* state, Object attrlist)
{
OCnode* node;
/* Check for and remove attribute duplicates */
NClist* dups = scopeduplicates((NClist*)attrlist);
if(dups != NULL) {
ocnodes_free(dups);
dap_parse_error(state,"Duplicate attribute names in same scope");
state->error = OC_ENAMEINUSE; /* semantic error */
return NULL;
}
node = newocnode(NULL,OC_Attributeset,state);
OCASSERT((state->root == NULL));
state->root = node;
/* make sure to cross link */
state->root->root = state->root;
node->subnodes = (NClist*)attrlist;
addedges(node);
return NULL;
}
void
dap_errorbody(DAPparsestate* state,
Object code, Object msg, Object ptype, Object prog)
{
state->error = OC_EDAPSVC;
state->code = nulldup((char*)code);
state->message = nulldup((char*)msg);
/* Ignore ptype and prog for now */
}
void
dap_unrecognizedresponse(DAPparsestate* state)
{
/* see if this is an HTTP error */
unsigned int httperr = 0;
int i;
char iv[32];
sscanf(state->lexstate->input,"%u ",&httperr);
sprintf(iv,"%u",httperr);
state->lexstate->next = state->lexstate->input;
/* Limit the amount of input to prevent runaway */
for(i=0;i<4096;i++) {if(state->lexstate->input[i] == '\0') break;}
state->lexstate->input[i] = '\0';
dap_errorbody(state,iv,state->lexstate->input,NULL,NULL);
}
Object
dap_declarations(DAPparsestate* state, Object decls, Object decl)
{
NClist* alist = (NClist*)decls;
if(alist == NULL)
alist = nclistnew();
else
nclistpush(alist,(void*)decl);
return alist;
}
Object
dap_arraydecls(DAPparsestate* state, Object arraydecls, Object arraydecl)
{
NClist* alist = (NClist*)arraydecls;
if(alist == NULL)
alist = nclistnew();
else
nclistpush(alist,(void*)arraydecl);
return alist;
}
Object
dap_arraydecl(DAPparsestate* state, Object name, Object size)
{
long value;
OCnode* dim;
if(!check_int32(size,&value)) {
dap_parse_error(state,"Dimension not an integer");
state->error = OC_EDIMSIZE; /* signal semantic error */
}
if(name != NULL)
dim = newocnode((char*)name,OC_Dimension,state);
else
dim = newocnode(NULL,OC_Dimension,state);
dim->dim.declsize = value;
return dim;
}
Object
dap_attrlist(DAPparsestate* state, Object attrlist, Object attrtuple)
{
NClist* alist = (NClist*)attrlist;
if(alist == NULL)
alist = nclistnew();
else {
if(attrtuple != NULL) {/* NULL=>alias encountered, ignore */
nclistpush(alist,(void*)attrtuple);
}
}
return alist;
}
Object
dap_attrvalue(DAPparsestate* state, Object valuelist, Object value, Object etype)
{
NClist* alist = (NClist*)valuelist;
if(alist == NULL) alist = nclistnew();
/* Watch out for null values */
if(value == NULL) value = "";
nclistpush(alist,(void*)strdup(value));
return alist;
}
Object
dap_attribute(DAPparsestate* state, Object name, Object values, Object etype)
{
OCnode* att;
att = newocnode((char*)name,OC_Attribute,state);
att->etype = octypefor(etype);
att->att.values = (NClist*)values;
return att;
}
Object
dap_attrset(DAPparsestate* state, Object name, Object attributes)
{
OCnode* attset;
attset = newocnode((char*)name,OC_Attributeset,state);
/* Check var set vs global set */
attset->att.isglobal = isglobalname(name);
attset->att.isdods = isdodsname(name);
attset->subnodes = (NClist*)attributes;
addedges(attset);
return attset;
}
static int
isglobalname(const char* name)
{
int len = strlen(name);
int glen = strlen("global");
const char* p;
if(len < glen) return 0;
p = name + (len - glen);
if(strcasecmp(p,"global") != 0)
return 0;
return 1;
}
static int
isdodsname(const char* name)
{
size_t len = strlen(name);
size_t glen = strlen("DODS");
if(len < glen) return 0;
if(ocstrncmp(name,"DODS",glen) != 0)
return 0;
return 1;
}
#if 0
static int
isnumber(const char* text)
{
for(;*text;text++) {if(!isdigit(*text)) return 0;}
return 1;
}
#endif
static void
dimension(OCnode* node, NClist* dimensions)
{
unsigned int i;
unsigned int rank = nclistlength(dimensions);
node->array.dimensions = (NClist*)dimensions;
node->array.rank = rank;
for(i=0;i<rank;i++) {
OCnode* dim = (OCnode*)nclistget(node->array.dimensions,i);
dim->dim.array = node;
dim->dim.arrayindex = i;
#if 0
if(dim->name == NULL) {
dim->dim.anonymous = 1;
dim->name = dimnameanon(node->name,i);
}
#endif
}
}
char*
dimnameanon(char* basename, unsigned int index)
{
char name[64];
sprintf(name,"%s_%d",basename,index);
return strdup(name);
}
Object
dap_makebase(DAPparsestate* state, Object name, Object etype, Object dimensions)
{
OCnode* node;
node = newocnode((char*)name,OC_Atomic,state);
node->etype = octypefor(etype);
dimension(node,(NClist*)dimensions);
return node;
}
Object
dap_makestructure(DAPparsestate* state, Object name, Object dimensions, Object fields)
{
OCnode* node;
NClist* dups = scopeduplicates((NClist*)fields);
if(dups != NULL) {
ocnodes_free(dups);
dap_parse_error(state,"Duplicate structure field names in same structure: %s",(char*)name);
state->error = OC_ENAMEINUSE; /* semantic error */
return (Object)NULL;
}
node = newocnode(name,OC_Structure,state);
node->subnodes = fields;
dimension(node,(NClist*)dimensions);
addedges(node);
return node;
}
Object
dap_makesequence(DAPparsestate* state, Object name, Object members)
{
OCnode* node;
NClist* dups = scopeduplicates((NClist*)members);
if(dups != NULL) {
ocnodes_free(dups);
dap_parse_error(state,"Duplicate sequence member names in same sequence: %s",(char*)name);
return (Object)NULL;
}
node = newocnode(name,OC_Sequence,state);
node->subnodes = members;
addedges(node);
return node;
}
Object
dap_makegrid(DAPparsestate* state, Object name, Object arraydecl, Object mapdecls)
{
OCnode* node;
/* Check for duplicate map names */
NClist* dups = scopeduplicates((NClist*)mapdecls);
if(dups != NULL) {
ocnodes_free(dups);
dap_parse_error(state,"Duplicate grid map names in same grid: %s",(char*)name);
state->error = OC_ENAMEINUSE; /* semantic error */
return (Object)NULL;
}
node = newocnode(name,OC_Grid,state);
node->subnodes = (NClist*)mapdecls;
nclistinsert(node->subnodes,0,(void*)arraydecl);
addedges(node);
return node;
}
static void
addedges(OCnode* node)
{
unsigned int i;
if(node->subnodes == NULL) return;
for(i=0;i<nclistlength(node->subnodes);i++) {
OCnode* subnode = (OCnode*)nclistget(node->subnodes,i);
subnode->container = node;
}
}
static void
setroot(OCnode* root, NClist* ocnodes)
{
size_t i;
for(i=0;i<nclistlength(ocnodes);i++) {
OCnode* node = (OCnode*)nclistget(ocnodes,i);
node->root = root;
}
}
int
daperror(DAPparsestate* state, const char* msg)
{
return dapsemanticerror(state,OC_EINVAL,msg);
}
int
dapsemanticerror(DAPparsestate* state, OCerror err, const char* msg)
{
dap_parse_error(state,msg);
state->error = err; /* semantic error */
return 0;
}
static char*
flatten(char* s, char* tmp, size_t tlen)
{
int c;
char* p,*q;
strncpy(tmp,s,tlen);
tmp[tlen] = '\0';
p = (q = tmp);
while((c=*p++)) {
switch (c) {
case '\r': case '\n': break;
case '\t': *q++ = ' '; break;
case ' ': if(*p != ' ') *q++ = c; break;
default: *q++ = c;
}
}
*q = '\0';
return tmp;
}
/* Create an ocnode and capture in the state->ocnode list */
static OCnode*
newocnode(char* name, OCtype octype, DAPparsestate* state)
{
OCnode* node = ocnode_new(name,octype,state->root);
nclistpush(state->ocnodes,(void*)node);
return node;
}
static int
check_int32(char* val, long* value)
{
char* ptr;
int ok = 1;
long iv = strtol(val,&ptr,0); /* 0=>auto determine base */
if((iv == 0 && val == ptr) || *ptr != '\0') {ok=0; iv=1;}
else if(iv > OC_INT32_MAX || iv < OC_INT32_MIN) ok=0;
if(value != NULL) *value = iv;
return ok;
}
static NClist*
scopeduplicates(NClist* list)
{
unsigned int i,j;
unsigned int len = nclistlength(list);
NClist* dups = NULL;
for(i=0;i<len;i++) {
OCnode* io = (OCnode*)nclistget(list,i);
retry:
for(j=i+1;j<len;j++) {
OCnode* jo = (OCnode*)nclistget(list,j);
if(strcmp(io->name,jo->name)==0) {
if(dups == NULL) dups = nclistnew();
nclistpush(dups,jo);
nclistremove(list,j);
len--;
goto retry;
}
}
}
return dups;
}
static OCtype
octypefor(Object etype)
{
switch ((long)etype) {
case SCAN_BYTE: return OC_Byte;
case SCAN_INT16: return OC_Int16;
case SCAN_UINT16: return OC_UInt16;
case SCAN_INT32: return OC_Int32;
case SCAN_UINT32: return OC_UInt32;
case SCAN_FLOAT32: return OC_Float32;
case SCAN_FLOAT64: return OC_Float64;
case SCAN_URL: return OC_URL;
case SCAN_STRING: return OC_String;
default: abort();
}
return OC_NAT;
}
void
dap_parse_error(DAPparsestate* state, const char *fmt, ...)
{
size_t len, suffixlen, prefixlen;
va_list argv;
char* tmp = NULL;
va_start(argv,fmt);
(void) vfprintf(stderr,fmt,argv) ;
(void) fputc('\n',stderr) ;
len = strlen(state->lexstate->input);
suffixlen = strlen(state->lexstate->next);
prefixlen = (len - suffixlen);
tmp = (char*)ocmalloc(len+1);
flatten(state->lexstate->input,tmp,prefixlen);
(void) fprintf(stderr,"context: %s",tmp);
flatten(state->lexstate->next,tmp,suffixlen);
(void) fprintf(stderr,"^%s\n",tmp);
(void) fflush(stderr); /* to ensure log files are current */
ocfree(tmp);
va_end(argv);
}
static void
dap_parse_cleanup(DAPparsestate* state)
{
daplexcleanup(&state->lexstate);
if(state->ocnodes != NULL) ocnodes_free(state->ocnodes);
state->ocnodes = NULL;
free(state);
}
static DAPparsestate*
dap_parse_init(char* buf)
{
DAPparsestate* state = (DAPparsestate*)ocmalloc(sizeof(DAPparsestate)); /*ocmalloc zeros*/
MEMCHECK(state,NULL);
if(buf==NULL) {
dap_parse_error(state,"dap_parse_init: no input buffer");
state->error = OC_EINVAL; /* semantic error */
dap_parse_cleanup(state);
return NULL;
}
daplexinit(buf,&state->lexstate);
return state;
}
/* Wrapper for dapparse */
OCerror
DAPparse(OCstate* conn, OCtree* tree, char* parsestring)
{
DAPparsestate* state = dap_parse_init(parsestring);
int parseresult;
OCerror ocerr = OC_NOERR;
state->ocnodes = nclistnew();
state->conn = conn;
if(ocdebug >= 2)
dapdebug = 1;
parseresult = dapparse(state);
if(parseresult == 0) {/* 0 => parse ok */
if(state->error == OC_EDAPSVC) {
/* we ended up parsing an error message from server */
conn->error.code = nulldup(state->code);
conn->error.message = nulldup(state->message);
tree->root = NULL;
/* Attempt to further decipher the error code */
if(state->code != NULL
&& (strcmp(state->code,"404") == 0 /* tds returns 404 */
|| strcmp(state->code,"5") == 0)) /* hyrax returns 5 */
ocerr = OC_ENOFILE;
else
ocerr = OC_EDAPSVC;
} else if(state->error != OC_NOERR) {
/* Parse failed for semantic reasons */
ocerr = state->error;
} else {
tree->root = state->root;
state->root = NULL; /* avoid reclaim */
tree->nodes = state->ocnodes;
state->ocnodes = NULL; /* avoid reclaim */
tree->root->tree = tree;
ocerr = OC_NOERR;
}
} else { /* Parse failed */
switch (tree->dxdclass) {
case OCDAS: ocerr = OC_EDAS; break;
case OCDDS: ocerr = OC_EDDS; break;
case OCDATADDS: ocerr = OC_EDATADDS; break;
default: ocerr = OC_EDAPSVC;
}
}
dap_parse_cleanup(state);
return ocerr;
}