//parse a config file and generate a Renderer
Renderer* ConfigParser::parse(std::string filename){
std::cout << "ConfigParser::parse config file... " << filename <<" \n";
struct basicxmlnode * rootNode = NULL;
//open file
FILE * fp = fopen(filename.c_str(), "rt");
if (!fp) {
std::cerr << "ConfigParser - Error: Failed opening file " << filename << "\n";
return NULL;
}
rootNode = readbasicxmlnode(fp);
fclose(fp);
if (!rootNode) {
std::cerr << "ConfigParser - Error: Failed reading file " << filename << ". Maybe an XML syntax error?\n";
return NULL;
}
//create renderer
Renderer* renderer = new Renderer();
//read renderer properties
if (!addRendererProperties(rootNode, renderer)) {
std::cerr << "ConfigParser - Error: Failed reading renderer properties in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(renderer);
return NULL;
}
//read sampler
struct basicxmlnode * samplerNode = getchildnodebyname(rootNode, "Sampler");
if (!addSampler(samplerNode, renderer)) {
std::cerr << "ConfigParser - Error: Failed reading sampler description in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(renderer);
return NULL;
}
//read shader
struct basicxmlnode * shaderNode = getchildnodebyname(rootNode, "Shader");
if (!addShader(shaderNode, renderer)) {
std::cerr << "ConfigParser - Error: Failed reading shader description in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(renderer);
return NULL;
}
//free xml memory
deletebasicxmlnode(rootNode);
std::cout << "[done]\n\n";
return renderer;
}
void Population::LoadConfigFile(char* iniFile)
{
// Loads the data file population information
_rootConfig = NULL;
FILE * fp = fopen(iniFile, "rt");
if (!fp) { throw("open failed"); }
_rootConfig = readbasicxmlnode(fp);
fclose(fp);
if (!_rootConfig) { throw("read failed"); }
}
//parse a scene description file and generate a Scene
Scene* SceneParser::parse(const char* filename){
std::cout << "SceneParser::parse parses scene... " << filename <<" \n";
struct basicxmlnode * rootNode = NULL;
//open file
FILE * fp = fopen(filename, "rt");
if (!fp) {
std::cerr << "SceneParser - Error: Failed opening file " << filename << "\n";
return NULL;
}
std::string filenameString = std::string(filename);
size_t index = filenameString.find_last_of("/");
if (index == std::string::npos) {
index = filenameString.find_last_of("\\");
}
if (index == std::string::npos) {
directory = "";
}
else {
directory = filenameString.substr(0,index+1);
}
//read xml tree
rootNode = readbasicxmlnode(fp);
fclose(fp);
if (!rootNode) {
std::cerr << "SceneParser - Error: Failed reading file " << filename << ". Maybe an XML syntax error?\n";
return NULL;
}
//construct scene
Scene* scene = new Scene();
//read scene properties
if (!addSceneProperties(rootNode, scene)) {
std::cerr << "SceneParser - Error: Failed to read Scene Properties in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(scene);
return NULL;
}
//read camera
struct basicxmlnode * cameraNode = getchildnodebyname(rootNode, "Camera");
if (!addCamera(cameraNode, scene)) {
std::cerr << "SceneParser - Error: Failed reading camera description in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(scene);
return NULL;
}
//read lights
struct basicxmlnode * lightsNode = getchildnodebyname(rootNode, "Lights");
if (!lightsNode) {
std::cout << "SceneParser - Warning: No Lights specified in " << filename << "\n";
}
else if (!lightsNode->children[0]) {
std::cout << "SceneParser - Warning: No Lights specified in " << filename << "\n";
}
else {
for(int lightsIndex = 0; lightsNode->children[lightsIndex]; lightsIndex++) {
if(!addLight(lightsNode->children[lightsIndex], scene)) {
std::cerr << "SceneParser - Error: Failed reading light description in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(scene);
return NULL;
}
}
}
//read materials
struct basicxmlnode * materialsNode = getchildnodebyname(rootNode, "Materials");
if (!materialsNode) {
std::cout << "SceneParser - No global Materials specified in " << filename << "\n";
}
else if (!materialsNode->children[0]) {
std::cout << "SceneParser - Empty Materials node in " << filename << "\n";
} else {
for(int materialsIndex = 0; materialsNode->children[materialsIndex]; materialsIndex++) {
if(!addGlobalMaterial(materialsNode->children[materialsIndex], scene)) {
std::cerr << "SceneParser - Error: Failed reading global material description in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(scene);
return NULL;
}
}
}
//read textures
struct basicxmlnode* texturesNode = getchildnodebyname(rootNode, "Textures");
if (!texturesNode) {
std::cout << "SceneParser - No global Textures specified in " << filename << "\n";
}
else if (!texturesNode->children[0]) {
std::cout << "SceneParser - Empty Textures node in " << filename << "\n";
}
else {
for(int texturesIndex = 0; texturesNode->children[texturesIndex]; texturesIndex++) {
if(!addGlobalTexture(texturesNode->children[texturesIndex], scene)) {
std::cerr << "SceneParser - Error: Failed reading global texture description in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(scene);
return NULL;
}
}
}
//read elements
struct basicxmlnode * elementsNode = getchildnodebyname(rootNode, "Elements");
if (!elementsNode) {
std::cout << "SceneParser - Warning: No Elements specified in " << filename << "\n";
}
else if (!elementsNode->children[0]) {
std::cout << "SceneParser - Warning: No Elements specified in " << filename << "\n";
}
for(int elementsIndex = 0; elementsNode->children[elementsIndex]; elementsIndex++) {
if(!addElement(elementsNode->children[elementsIndex], scene)) {
std::cerr << "SceneParser - Error: Failed reading element description in " << filename << "\n";
deletebasicxmlnode(rootNode);
delete(scene);
return NULL;
}
}
//free xml memory
deletebasicxmlnode(rootNode);
std::cout << "[done]\n\n";
return scene;
}
/* readbasicxmlnode: reads simple XML file */
struct basicxmlnode *readbasicxmlnode( FILE * fpi )
{
int bufinc=500, textinc=50, childinc=50; /* tuning */
char * buf=0; int nbuf=0;
char * ibuf=0, * buftmp, * wspos, * ps, * pe, * pe2;
int phase=0, ch=0, err=0, ii=0, ia, natts, * nodeitmp;
int itex=0, ntex=textinc, ichi=0, nchi=childinc, nest=0;
typedef /*struct*/ basicxmlnode nodetype;
nodetype * node, * child, * * nodetmp;
if (!err && !fpi) err=1; /* bad arg */
/* get chars between < and >; strip most whitespace */
while (1) {
int isws=0, issl=0, islt=0, isgt=0, iseq=0, isqu=0;
int isqs=0, isex=0, isda=0, issi=0, isls=0, isrs=0;
int isn1=0, isn2=0;
if ((ibuf-buf+5) > nbuf) { /* realloc buf */
nbuf += bufinc;
buftmp = new char[nbuf]; /*(char*)malloc(so_c*nbuf);*/
if (!buftmp) {
err=2; break; /* out of memory */
}
if (buf) {
ii = ibuf-buf;
strncpy(buftmp, buf, ii);
delete [] buf; /*free(buf);*/
}
buf = buftmp;
ibuf = buf + ii;
}
if (phase != 100) ch = fgetc(fpi);
if (err || feof(fpi) || (phase == 100)) break;
/* analyze char */ /* /<>="?!-'12*/
if ((ch == ' ') || ((ch > 8) && (ch < 14))) isws = 1;
if (ch == '/') issl = 1; if (ch == '<') islt = 1;
if (ch == '>') isgt = 1; if (ch == '=') iseq = 1;
if (ch == '"') isqu = 1; if (ch == '?') isqs = 1;
if (ch == '!') isex = 1; if (ch == '-') isda = 1;
if (ch == '[') isls = 1; if (ch == ']') isrs = 1;
if (ch == '\'') issi = 1;
if ((ch >= 'a') && (ch <= 'z')) isn1 = 1;
if ((ch >= 'A') && (ch <= 'Z')) isn1 = 1;
if (ch == '_') isn1 = 1;
if (isn1 || isda || (ch == '.')) isn2 = 1;
if ((ch >= '0') && (ch <= '9')) isn2 = 1;
/* err=3, bad xml file (parsing error) */
switch (phase) {
case 0: /* eat whitespace before < */
if (isws) { } /* */
else if (islt) { ++phase; *ibuf=ch; ++ibuf; } /*<*/
else { err=3; } /**/ /*/>="?!-'t1*/
break;
case 1: /* handle the first char after < */
if (issl) { phase=10; *ibuf=ch; ++ibuf; } /*</*/
else if (isqs) { phase=14; --ibuf; } /*<?*/
else if (isex) { phase=15; --ibuf; } /*<!*/
else if (isn1) { ++phase; *ibuf=ch; ++ibuf; } /*<t*/
else { err=3; } /*<*/ /* <>="-'1*/
break;
case 2: /* store tag name and a single space after it */
if (isws) { ++phase; *ibuf = ' '; ++ibuf; } /*<t */
else if (issl) { phase=13; strncpy(ibuf," /",2); ibuf+=2; } /*<t/*/
else if (isgt) { phase=100; strncpy(ibuf," >",2); ibuf+=2; } /*<t>*/
else if (isn2) { *ibuf=ch; ++ibuf; } /*<t*/ /*-1*/
else { err=3; } /*<t*/ /*<="?!'*/
break;
case 3: /* eat whitespace after tag name */
if (isws) { } /*<tag */
else if (issl) { phase=13; *ibuf=ch; ++ibuf; } /*<tag /*/
else if (isgt) { phase=100; *ibuf=ch; ++ibuf; } /*<tag >*/
else if (isn1) { ++phase; *ibuf=ch; ++ibuf; } /*<tag t*/
else { err=3; } /*<tag */ /*<="?!-'1*/
break;
case 4: /* store attribute name */
if (isws) { ++phase; } /*<tag a */
else if (iseq) { phase=6; *ibuf=ch; ++ibuf; } /*<tag a=*/
else if (isn2) { *ibuf=ch; ++ibuf; } /*<tag a*/ /*-t1*/
else { err=3; } /*<tag a*/ /*/<>"?!'t*/
break;
case 5: /* eat whitespace after attribute name */
if (isws) { } /*<tag attr */
else if (iseq) { ++phase; *ibuf=ch; ++ibuf; } /*<tag attr =*/
else { err=3; } /*<tag attr */ /*/<>"?!-'t1*/
break;
case 6: /* eat whitespace after = */
if (isws) { } /*<tag attr= */
else if (isqu) { ++phase; *ibuf=ch; ++ibuf; } /*<tag attr="*/
else if (issi) { phase=8; *ibuf=ch; ++ibuf; } /*<tag attr='*/
else { err=3; } /*<tag attr=*/ /*/<>=?!-t1*/
break;
case 7: /* store the attribute value ("value") */
if (isws) { *ibuf=' '; ++ibuf; } /*tag attr=" */
else if (islt) { err=3; } /*<tag attr="<*/
else if (isqu) { phase=9; *ibuf=ch; ++ibuf; } /*<tag attr=""*/
else { *ibuf=ch; ++ibuf; } /*tag attr="*/ /*/>=?!-'t1*/
break;
case 8: /* store the attribute value ('value') */
if (isws) { *ibuf=' '; ++ibuf; } /*<tag attr=' */
else if (islt) { err=3; } /*<tag attr='<*/
else if (issi) { ++phase; *ibuf=ch; ++ibuf; } /*<tag attr=''*/
else { *ibuf=ch; ++ibuf; } /*tag attr='*/ /*/>="?!-t1*/
break;
case 9: /* eat whitespace after attribute value */
if (isws) { phase=3; *ibuf=' '; ++ibuf; } /*<tag attr="value" */
else if (issl) { phase=13; strncpy(ibuf," /",2); ibuf+=2; } /*..."/*/
else if (isgt) { phase=100; strncpy(ibuf," >",2); ibuf+=2; } /*...">*/
else { err=3; } /*tag attr="value"*/ /*<="?!-'t1*/
break;
case 10: /* handle the first char after </ */
if (isn1) { ++phase; *ibuf=ch; ++ibuf; } /*</t*/
else { err=3; } /*</*/ /* /<>="?!-'1*/
break;
case 11: /* store tag name and a single space after it */
if (isws) { ++phase; *ibuf=' '; ++ibuf; } /*</t */
else if (isgt) { phase=100; strncpy(ibuf," >",2); ibuf+=2; } /*</t>*/
else if (isn2) { *ibuf=ch; ++ibuf; } /*</t*/ /*-t*/
else { err=3; } /*</t*/ /*/<="?!'*/
break;
case 12: /* eat whitespace before > */
if (isws) { } /*</tag */
else if (isgt) { phase=100; *ibuf=ch; ++ibuf; } /*</tag >*/
else { err=3; } /*</tag */ /*/<="?!-'t1*/
break;
case 13: /* ensure final > */
if (isgt) { phase=100; *ibuf=ch; ++ibuf; } /*<tag />*/
else { err=3; } /*<tag /*/ /* /<="?!-'t1*/
break;
case 14: /* skip tag (probably <? tag) */
if (isgt) { if (nest < 1) nest=phase=0; } /*<?>*/
else if (isls) { ++nest; } /*<?[*/
else if (isrs) { --nest; } /*<?[*/
else { } /*<?*/ /* /<="?!-'t1*/
break;
case 15: /* find first - (<! tag) */
if (isgt) { phase=0; } /*<!>*/
else if (isda) { ++phase; } /*<!-*/
else if (isls) { ++nest; phase=14; } /*<![*/
else { phase=14; } /*<!*/ /* /<="?!'t1*/
break;
case 16: /* find second - (<!- tag) */
if (isgt) { phase=0; } /*<!->*/
else if (isda) { ++phase; } /*<!--*/
else { phase=14; } /*<!-*/ /* /<="?!'t1*/
break;
case 17: /* skip comment */
if (isda) { ++phase; } /*-*/
else { } /**/ /* /<>="?!'t1*/
break;
case 18: /* find second - in --> */
if (isda) { ++phase; } /*--*/
else { phase=17; } /*-*/ /* /<>="?!'t1*/
break;
case 19: /* find > in --> */
if (isgt) { phase=0; } /*-->*/
else { err=3; } /*--*/ /* /<="?!-'t1*/
break;
};
if (err) break;
}
if (!err && (phase != 100)) {
err=4; /* incomplete xml file */
}
if (!err) *ibuf = 0;
/* buf is now in one of these formats: */
/* <tag > or </tag > or <tag /> or */
/* <tag attr="value" ... attr="value" > or */
/* <tag attr="value" ... attr="value" /> */
/* allocate memory for a node */
node = new nodetype; /*(nodetype*)malloc(so_n);*/
if (node) {
node->tag = node->text = 0;
node->attrs = node->values = 0;
node->children = 0;
node->childreni = 0;
}
if (!err) {
if (!node) {
err=5; /* out of memory */
} else {
memset(node, 0, sizeof(node));
} }
/* put tag name into node */
if (!err) {
wspos = strchr(buf, ' ');
node->tag = new char[wspos-buf]; /*(char*)malloc(so_c*(wspos-buf));*/
if (!node->tag) err=6; /* out of memory */
}
if (!err) {
strncpy(node->tag, buf+1, wspos-buf-1);
node->tag[wspos-buf-1] = 0;
if (buf[1] == '/') { /* end tag (not err) */
delete [] buf; /*free(buf);*/
return node;
}
/* estimate # of attrs and values (maybe too much) */
pe = strstr(wspos, "\" ");
pe2 = strstr(wspos, "' ");
for (natts=0; pe || pe2; ++natts) {
if (!pe || (pe2 && (pe2 < pe))) pe = pe2;
pe2 = strstr(pe+1, "' "); pe = strstr(pe+1, "\" ");
}
node->attrs = new char *[natts+1]; /*(char**)malloc(so_cp*(natts+1));*/
node->values = new char *[natts+1]; /*(char**)malloc(so_cp*(natts+1));*/
if (!node->attrs||!node->values) {
if (node->attrs) delete [] node->attrs; /*free(node->attrs);*/
if (node->values) delete [] node->values; /*free(node->values);*/
node->attrs=node->values=0; err=7; /* out of memory */
} }
/* put attrs and values into node (and recount #) */
if (!err) { ps = wspos+1;
pe = strstr(wspos, "=\""); pe2 = strstr(wspos, "='");
}
for (natts=0, ia=0; !err && (pe||pe2); ++ia, ++natts) {
if (!pe || (pe2 && (pe2 < pe))) pe = pe2;
node->attrs[ia] = new char[pe-ps+1]; /*(char*)malloc(so_c*(pe-ps+1));*/
if (!node->attrs[ia]) {
node->values[ia]=0; err=8; break; /* out of memory */
}
strncpy(node->attrs[ia], ps, pe-ps);
node->attrs[ia][pe-ps] = 0;
node->attrs[ia+1] = 0;
ps = pe + 2;
if (pe == pe2) pe = strstr(ps, "' ");
else pe = strstr(ps, "\" ");
node->values[ia] = new char[pe-ps+1]; /*(char*)malloc(so_c*(pe-ps+1));*/
if (!node->values[ia]) { err=9; break; } /* out of memory */
strncpy(node->values[ia], ps, pe-ps);
node->values[ia][pe-ps] = 0;
node->values[ia+1] = 0;
ps = pe + 2;
pe2 = strstr(ps, "='"); pe = strstr(ps, "=\"");
}
if (!err) {
node->attrs[natts] = node->values[natts] = 0;
/* no children for self-contained tag, save memory */
if (buf[strlen(buf)-2] == '/') {
ntex = 1; nchi = 1;
}
/* no body or children yet */
node->text = new char[ntex]; /*(char*)malloc(so_c*ntex);*/
node->children = new nodetype *[nchi]; /*(nodetype**)malloc(so_np*nchi);*/
node->childreni = new int [nchi]; /*(int*)malloc(so_i*nchi);*/
if (!node->text || !node->children || !node->childreni) {
err=10; /* out of memory */
} else {
node->text[0] = 0; node->children[0] = 0; node->childreni[0] = 0;
} }
if (!err) {
if (ntex == 1) { /* end tag, no children (not err) */
delete [] buf; /*free(buf);*/
return node;
} }
/* read child tags */
for (ichi=0; !err; ++ichi) {
/* add more text to node (between child tags) */
for (ch=fgetc(fpi); ch != '<'; ch=fgetc(fpi)) {
if (feof(fpi)) {
err=11; /* incomplete xml file */
break;
}
if ((itex+2) == ntex) { /* realloc text */
ntex += textinc;
buftmp = new char[ntex]; /*(char*)malloc(so_c*ntex);*/
if (!buftmp) { err=12; break; } /* out of memory */
strncpy(buftmp, node->text, itex);
delete [] node->text; /*free(node->text);*/
node->text = buftmp;
}
node->text[itex++] = ch;
}
if (err) continue;
node->text[itex] = 0;
ungetc(ch, fpi); /* oops, put back next tag's "<" */
child = readbasicxmlnode(fpi);
if (child) {
if (child->tag[0] == '/') {
if (strcmp(child->tag+1, node->tag)) {
err=13; /* end tag mismatch */
}
delete [] child->tag; /*free(child->tag);*/
delete child; /*free(child);*/
child=0;
} } else if (!err) {
err=14; /* bad child */
}
if (err || !child) break;
node->children[ichi] = child;
node->childreni[ichi] = itex;
if ((ichi+2) == nchi) { /* realloc child tags array */
nchi += childinc;
nodetmp = new nodetype *[nchi]; /*(nodetype**)malloc(so_np*nchi);*/
if (!nodetmp) { err=15; continue; } /* out of memory */
nodeitmp = new int [nchi]; /*(int*)malloc(so_i*nchi);*/
if (!nodeitmp) {
delete [] nodetmp; /*free(nodetmp);*/
nodetmp=0; err=16; continue; /* out of memory */
}
for (ii=0; ii <= ichi; ++ii) { /* copy */
nodetmp[ii] = node->children[ii];
nodeitmp[ii] = node->childreni[ii];
}
delete [] node->children; /*free(node->children);*/
delete [] node->childreni; /*free(node->childreni);*/
node->children = nodetmp;
node->childreni = nodeitmp;
} }
if (node) {
if (node->children) {
node->children[ichi] = 0;
node->childreni[ichi] = 0;
if (err) { /* delete complete node */
deletebasicxmlnode(node); node = 0;
} } else { /* delete partial node */
if (node->tag) delete [] node->tag; /*free(node->tag);*/
if (node->text) delete [] node->text; /*free(node->text);*/
if (node->attrs) {
for (ii=0; node->attrs[ii]; ++ii) {
delete [] node->attrs[ii]; /*free(node->attrs[ii]);*/
} }
if (node->values) {
for (ii=0; node->values[ii]; ++ii) {
delete [] node->values[ii]; /*free(node->values[ii]);*/
} }
if (node->attrs) delete node->attrs; /*free(node->attrs);*/
if (node->values) delete node->values; /*free(node->values);*/
delete node; /*free(node);*/
node = 0;
} }
if (buf) delete [] buf; /*free(buf);*/
return node; /* whew! return complete node */
}