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Parser.cc
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Parser.cc
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#include "Box.h"
#include "CheckeredMaterial.h"
#include "ConstantBackground.h"
#include "Disc.h"
#include "Group.h"
#include "Image.h"
#include "LambertianMaterial.h"
#include "LambertianTextureMaterial.h"
#include "MetalMaterial.h"
#include "Parser.h"
#include "PerlinMaterial.h"
#include "PinholeCamera.h"
#include "Plane.h"
#include "PointLight.h"
#include "RefractionMaterial.h"
#include "Ring.h"
#include "Scene.h"
#include "SpecularMaterial.h"
#include "Sphere.h"
#include "PolarSphere.h"
#include "Triangle.h"
#include "ply.h"
#include <cmath>
#include <cstdlib>
#include <iostream>
#include <istream>
#include <sstream>
#include <string>
using namespace std;
void Parser::throwParseException(
string const &message ) const
{
cerr << next_token.line_number << ":" << next_token.column_number << ": " << message << endl;
exit( 1 );
}
void Parser::readNextToken()
{
int state = 0;
long long mantissa = 0;
int exponent = 0;
int exponent_adjustment = 0;
bool negative_mantissa = false;
bool negative_exponent = false;
for ( ; ; ) {
int character = input.get();
switch ( state ) {
case 0:
next_token.line_number = line_number;
next_token.column_number = column_number;
if ( input.eof() ) {
next_token.token_type = Token::end_of_file;
return;
} else if ( character == ' ' || character == '\t' ||
character == '\r' || character == '\n' )
state = 0;
else if ( character == '/' )
state = 1;
else if ( character == '+' || character == '-' ) {
negative_mantissa = character == '-';
state = 3;
} else if ( character >= '0' && character <= '9' ) {
mantissa = character - '0';
state = 4;
} else if ( character == '.' )
state = 5;
else if ( character == '"' ) {
next_token.string_value.clear();
state = 10;
} else if ( (character >= 'A' && character <= 'Z') ||
(character >= 'a' && character <= 'z') ||
character == '_' ) {
next_token.string_value = static_cast< char >( character );
state = 12;
} else if ( character == ',' ) {
++column_number;
next_token.token_type = Token::comma;
return;
} else if ( character == '{' ) {
++column_number;
next_token.token_type = Token::left_brace;
return;
} else if ( character == '}' ) {
++column_number;
next_token.token_type = Token::right_brace;
return;
} else if ( character == '[' ) {
++column_number;
next_token.token_type = Token::left_bracket;
return;
} else if ( character == ']' ) {
++column_number;
next_token.token_type = Token::right_bracket;
return;
} else
throwParseException( "Unexpected character" );
break;
case 1:
if ( character == '/' )
state = 2;
else
throwParseException( "Malformed comment" );
break;
case 2:
if ( character == '\n' || input.eof() )
state = 0;
break;
case 3:
if ( character >= '0' && character <= '9' ) {
mantissa = character - '0';
state = 4;
} else if ( character == '.' )
state = 5;
else
throwParseException( "Invalid number" );
break;
case 4:
if ( character >= '0' && character <= '9' )
mantissa = mantissa * 10 + character - '0';
else if ( character == '.' )
state = 6;
else if ( character == 'E' || character == 'e' )
state = 7;
else {
input.putback( static_cast< char >( character ) );
next_token.integer_value = ( static_cast< int >( mantissa ) *
( negative_mantissa ? -1 : 1 ) );
next_token.token_type = Token::integer;
return;
}
break;
case 5:
if ( character >= '0' && character <= '9' ) {
mantissa = character - '0';
exponent_adjustment = 1;
state = 6;
} else
throwParseException( "Invalid number" );
break;
case 6:
if ( character >= '0' && character <= '9' ) {
mantissa = mantissa * 10 + character - '0';
++exponent_adjustment;
} else if ( character == 'E' || character == 'e' )
state = 7;
else {
input.putback( static_cast< char >( character ) );
next_token.real_value = ( mantissa * ( negative_mantissa ? -1 : 1 ) *
pow( 10.0, -exponent_adjustment ) );
next_token.token_type = Token::real;
return;
}
break;
case 7:
if ( character == '+' || character == '-' ) {
negative_exponent = character == '-';
state = 8;
} else if ( character >= '0' && character <= '9' ) {
exponent = character - '0';
state = 9;
} else
throwParseException( "Invalid number" );
break;
case 8:
if ( character >= '0' && character <= '9' ) {
exponent = character - '0';
state = 9;
} else
throwParseException( "Invalid number" );
break;
case 9:
if ( character >= '0' && character <= '9' )
exponent = exponent * 10 + character - '0';
else {
input.putback( static_cast< char >( character ) );
next_token.real_value = ( mantissa * ( negative_mantissa ? -1 : 1 ) *
pow( 10.0, ( exponent * ( negative_exponent ? -1 : 1 ) -
exponent_adjustment ) ) );
next_token.token_type = Token::real;
return;
}
break;
case 10:
if ( input.eof() || character == '\n' )
throwParseException( "Unterminated string" );
else if ( character == '\\' )
state = 11;
else if ( character == '"' ) {
++column_number;
next_token.token_type = Token::string;
return;
} else
next_token.string_value.push_back( static_cast< char >( character ) );
break;
case 11:
if ( input.eof() )
throwParseException( "Unterminated string" );
else if ( character == '\n' )
next_token.string_value.push_back( '\n' );
else if ( character == '\\' )
next_token.string_value.push_back( '\\' );
else if ( character == '"' )
next_token.string_value.push_back( '"' );
else
next_token.string_value.push_back( static_cast< char >( character ) );
state = 10;
break;
case 12:
if ( (character >= '0' && character <= '9') ||
(character >= 'A' && character <= 'Z') ||
(character >= 'a' && character <= 'z') ||
character == '_' )
next_token.string_value.push_back( static_cast< char >( character ) );
else {
input.putback( static_cast< char >( character ) );
next_token.token_type = Token::string;
return;
}
break;
}
if ( character == '\n' )
{
++line_number;
column_number = 0;
}
else if ( character == '\t' )
column_number = ( column_number + 8 ) / 8 * 8;
else
++column_number;
}
}
bool Parser::peek(
Token::type const type )
{
bool matched = next_token.token_type == type;
if ( matched )
readNextToken();
return matched;
}
bool Parser::peek(
string const &keyword )
{
bool matched = ( next_token.token_type == Token::string &&
next_token.string_value == keyword );
if ( matched )
readNextToken();
return matched;
}
Parser::Token Parser::match(
Token::type const type,
string const &failure_message )
{
if ( next_token.token_type != type )
throwParseException( failure_message );
Token current_token( next_token );
readNextToken();
return current_token;
}
Parser::Token Parser::match(
string const &keyword,
string const &failure_message )
{
if ( next_token.token_type != Token::string ||
next_token.string_value != keyword )
throwParseException( failure_message );
Token current_token( next_token );
readNextToken();
return current_token;
}
string Parser::parseString()
{
Token next( match( Token::string, "Expected a string" ) );
return next.string_value;
}
bool Parser::parseBoolean()
{
if ( peek( "true" ) )
return true;
else if ( peek( "false" ) )
return false;
else
throwParseException( "Expected `true' or `false'." );
return false;
}
int Parser::parseInteger()
{
Token next( match( Token::integer, "Expected an integer" ) );
return next.integer_value;
}
double Parser::parseReal()
{
if ( next_token.token_type == Token::integer ) {
Token next( match( Token::integer, "Expected an integer or real" ) );
return static_cast< double >( next.integer_value );
}
Token next( match( Token::real, "Expected an integer or real" ) );
return next.real_value;
}
Vector const Parser::parseVector()
{
match( Token::left_bracket, "Expected a left bracket" );
double x = parseReal();
match( Token::comma, "Expected a comma" );
double y = parseReal();
match( Token::comma, "Expected a comma" );
double z = parseReal();
match( Token::right_bracket, "Expected a right bracket" );
return Vector( x, y, z );
}
Point const Parser::parsePoint()
{
match( Token::left_bracket, "Expected a left bracket" );
double x = parseReal();
match( Token::comma, "Expected a comma" );
double y = parseReal();
match( Token::comma, "Expected a comma" );
double z = parseReal();
match( Token::right_bracket, "Expected a right bracket" );
return Point( x, y, z );
}
Color const Parser::parseColor()
{
if ( peek( Token::left_bracket ) ) {
double r = parseReal();
match( Token::comma, "Expected a comma" );
double g = parseReal();
match( Token::comma, "Expected a comma" );
double b = parseReal();
match( Token::right_bracket, "Expected a right bracket" );
return Color( r, g, b );
}
double v = parseReal();
return Color( v, v, v );
}
Camera *Parser::parsePinholeCamera()
{
int time = 0;
Animation<Point> eye;
Animation<Point> lookat;
Animation<Vector> up;
double hfov = 90.0;
if ( peek( Token::left_brace ) )
for ( ; ; )
{
if ( peek( "eye" ) )
eye.addFrame(time, parsePoint());
else if ( peek( "lookat" ) )
lookat.addFrame(time, parsePoint());
else if ( peek( "up" ) )
up.addFrame(time, parseVector());
else if ( peek( "hfov" ) )
hfov = parseReal();
else if ( peek( "time" ) )
{
time = parseInteger();
max_time = max(time, max_time);
}
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `eye', `lookat', `up', `hfov' or }." );
}
if(eye.isEmpty() || lookat.isEmpty() || up.isEmpty())
throwParseException( "Missing `eye', `lookat' or `up'" );
return new PinholeCamera( eye, lookat, up, hfov );
}
Camera *Parser::parseCamera()
{
if ( peek( "pinhole" ) )
return parsePinholeCamera();
throwParseException( "Expected a camera type." );
return 0;
}
Background *Parser::parseConstantBackground()
{
Color color( 0.0, 0.0, 0.0 );
if ( peek( Token::left_brace ) )
for ( ; ; )
{
if ( peek( "color" ) )
color = parseColor();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `color' or }." );
}
return new ConstantBackground( color );
}
Background *Parser::parseBackground()
{
if ( peek( "constant" ) )
return parseConstantBackground();
throwParseException( "Expected a background type." );
return 0;
}
Light *Parser::parsePointLight()
{
Point position( 0.0, 0.0, 10.0 );
Color color( 1.0, 1.0, 1.0 );
if ( peek( Token::left_brace ) )
for ( ; ; )
{
if ( peek( "position" ) )
position = parsePoint();
else if ( peek( "color" ) )
color = parseColor();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `position', `color' or }." );
}
return new PointLight( position, color );
}
Light *Parser::parseLight()
{
if ( peek( "point" ) )
return parsePointLight();
throwParseException( "Expected a light type." );
return 0;
}
Material *Parser::parseLambertianMaterial()
{
Color color( 1.0, 1.0, 1.0 );
double Kd = 0.6;
double Ka = 0.3;
string file;
if ( peek( Token::left_brace ) )
for ( ; ; )
{
if ( peek( "color" ) )
color = parseColor();
else if ( peek( "file" ) )
file = parseString();
else if ( peek( "Kd" ) )
Kd = parseReal();
else if ( peek( "Ka" ) )
Ka = parseReal();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `color', `file', `Kd', `Ka' or }." );
}
if(file.empty())
return new LambertianMaterial( color, Kd, Ka );
else
return new LambertianTextureMaterial( file, Kd, Ka );
}
Material *Parser::parseSpecularMaterial()
{
int time = 0;
Color color( 1.0, 1.0, 1.0 );
Animation<Color> highlight;
Animation<float> Kd;
Animation<float> Ka;
Animation<float> Kr;
Animation<int> exp;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "color" ) )
color = parseColor();
else if ( peek( "Kd" ) )
Kd.addFrame(time, parseReal());
else if ( peek( "Ka" ) )
Ka.addFrame(time, parseReal());
else if ( peek( "Kr" ) )
Kr.addFrame(time, parseReal());
else if ( peek( "exp" ) || peek( "exponent" ))
exp.addFrame(time, parseInteger());
else if ( peek( "highlight" ) )
highlight.addFrame(time, parseColor());
else if ( peek( "time" ) )
{
time = parseInteger();
max_time = max(time, max_time);
}
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `color', `Kd', `Ka', `Kr', `exp', `time' or }." );
}
}
if(highlight.isEmpty())
highlight.addFrame(0, Color(1, 1, 1));
if(Kd.isEmpty())
Kd.addFrame(0, 0.6);
if(Ka.isEmpty())
Ka.addFrame(0, 0.3);
if(Kr.isEmpty())
Kr.addFrame(0, 0.4);
if(exp.isEmpty())
exp.addFrame(0, 50);
return new SpecularMaterial( color, highlight, Kd, Ka, Kr, exp );
}
Material *Parser::parseCheckeredMaterial()
{
Material *m1 = 0;
Material *m2 = 0;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "material1" ) )
m1 = parseMaterial();
else if ( peek( "material2" ) )
m2 = parseMaterial();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material1', `material2', or }." );
}
}
if(!m1 || !m2)
throwParseException( "Expected `material1', `material2', or }." );
return new CheckeredMaterial( m1, m2 );
}
Material *Parser::parsePerlinMaterial()
{
Material *m1 = 0;
Material *m2 = 0;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "material1" ) )
m1 = parseMaterial();
else if ( peek( "material2" ) )
m2 = parseMaterial();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material1', `material2', or }." );
}
}
if(!m1 || !m2)
throwParseException( "Expected `material1', `material2', or }." );
return new PerlinMaterial( m1, m2 );
}
Material *Parser::parseRefractionMaterial()
{
int time = 0;
Animation<float> eta;
Animation<int> exp;
Animation<Color> atten;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "eta" ) )
eta.addFrame(time, parseReal());
else if ( peek( "exp" ) || peek( "exponent" ))
exp.addFrame(time, parseInteger());
else if ( peek( "attenuation" ) )
atten.addFrame(time, parseColor());
else if ( peek( "time" ) )
{
time = parseInteger();
max_time = max(time, max_time);
}
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `eta', `exp', `attenuation', `time', or }." );
}
}
if(eta.isEmpty())
eta.addFrame(0, 1. / 1.33);
if(exp.isEmpty())
exp.addFrame(0, 50);
if(atten.isEmpty())
atten.addFrame(0, Color(1.,1.,1.));
return new RefractionMaterial( eta, exp, atten );
}
Material *Parser::parseMetalMaterial()
{
int time = 0;
Animation<float> color;
Animation<int> exp;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "color" ) )
color.addFrame(time, parseReal());
else if ( peek( "exp" ) || peek( "exponent" ))
exp.addFrame(time, parseInteger());
else if ( peek( Token::right_brace ) )
break;
else if ( peek( "time" ) )
{
time = parseInteger();
max_time = max(time, max_time);
}
else
throwParseException( "Expected `color', `exp' or }." );
}
}
if(color.isEmpty())
color.addFrame(0, 0.0);
if(exp.isEmpty())
exp.addFrame(0, 50);
return new MetalMaterial( color, exp );
}
Material *Parser::parseMaterial()
{
if ( peek( "lambertian" ) )
return parseLambertianMaterial();
else if ( peek( "specular" ) || peek( "phong" ))
return parseSpecularMaterial();
else if ( peek( "refraction" ) || peek( "dielectric") )
return parseRefractionMaterial();
else if ( peek( "checkered" ) )
return parseCheckeredMaterial();
else if ( peek( "metal" ) )
return parseMetalMaterial();
else if ( peek( "perlin" ) )
return parsePerlinMaterial();
else if ( next_token.token_type == Token::string )
{
map< string, Material * >::iterator found = defined_materials.find( parseString() );
if ( found != defined_materials.end() )
return ( *found ).second;
}
throwParseException( "Expected an material type." );
return 0;
}
Object *Parser::parseGroupObject()
{
Group *group = new Group(false);
match( Token::left_brace, "Expected a left brace" );
while ( !peek( Token::right_brace ) )
group->addObject( parseObject() );
return group;
}
Object *Parser::parsePlaneObject()
{
Material *material = default_material;
Vector normal( 0.0, 0.0, 1.0 );
Point point( 0.0, 0.0, 0.0 );
if ( peek( Token::left_brace ) )
for ( ; ; )
{
if ( peek( "material" ) )
material = parseMaterial();
else if ( peek( "normal" ) )
normal = parseVector();
else if ( peek( "point" ) )
point = parsePoint();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material', `point', `normal' or }." );
}
return new Plane( material, normal, point );
}
Object *Parser::parseSphereObject()
{
Material *material = default_material;
int time = 0;
Animation<Point> center;
Animation<double> radius;
Animation<Vector> meridian;//(1,0,0);
Animation<Vector> pole;//(0,0,1);
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "material" ) )
material = parseMaterial();
else if ( peek( "center" ) )
center.addFrame((double)time, parsePoint());
else if ( peek( "radius" ) )
radius.addFrame((double)time, parseReal());
else if ( peek( "pole" ) )
{
Vector p = parseVector();
p.normalize();
pole.addFrame((double)time, p);
}
else if ( peek( "meridian" ) )
{
Vector m = parseVector();
m.normalize();
meridian.addFrame((double)time, m);
}
else if ( peek( "time" ) )
{
time = parseInteger();
max_time = max(time, max_time);
}
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material', `center', `radius', `pole', `meridian', `time' or }." );
}
}
if(center.isEmpty() || radius.isEmpty())
throwParseException( "Expected `material', `center', `radius' or }." );
if(pole.isEmpty() || meridian.isEmpty())
return new Sphere( material, center, radius);
else
return new PolarSphere( material, center, radius, pole, meridian);
}
Object *Parser::parsePlyObject()
{
Material *material = default_material;
std::string filename;
Vector translate(0,0,0);
Vector scale(1,1,1);
bool bottomUp = false;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "material" ) )
material = parseMaterial();
else if ( peek( "filename" ) )
filename = parseString();
else if ( peek( "scale" ) )
scale = parseVector();
else if ( peek( "translate" ) )
translate = parseVector();
else if ( peek( "bottomUp" ) )
bottomUp = parseBoolean();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material', `filename', `scale', `translate' or }." );
}
}
if(filename.empty())
throwParseException( "Missing: `filename'");
ply::plyFile file = ply::plyFile::parseFile(filename.c_str());
Group *g = new Group(bottomUp);
std::vector<unsigned> faces = file.getElements();
Point p1;
Point p2;
Point p3;
Vector normal;
if(faces.size() % 3 != 0)
throwParseException("expected exact triangles but this model doesn't have full triangles");
for(unsigned i = 0; i < faces.size(); i+=3)
{
p1 = (Point(file.vertex(faces[i])) * scale)+translate;
p2 = (Point(file.vertex(faces[i+1])) * scale)+translate;
p3 = (Point(file.vertex(faces[i+2])) * scale)+translate;
normal = file.normal(faces[i]);
g->addObject(new Triangle(material, p1, p2, p3, normal));
}
cout << "done parsing model file " << filename << " with " << faces.size() / 3. << " faces" << endl;
return g;
}
Object *Parser::parseTriangleObject()
{
Material *material = default_material;
int time = 0;
Animation<Point> p1;
Animation<Point> p2;
Animation<Point> p3;
Animation<Vector> normal;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "material" ) )
material = parseMaterial();
else if ( peek( "p1" ) || peek( "corner1") )
p1.addFrame((double)time, parsePoint());
else if ( peek( "p2" ) || peek( "corner2") )
p2.addFrame((double)time, parsePoint());
else if ( peek( "p3" ) || peek( "corner3") )
p3.addFrame((double)time, parsePoint());
else if ( peek( "normal" ) )
{
Vector n(parseVector());
n.normalize();
normal.addFrame((double)time, n);
}
else if ( peek( "time" ) )
{
time = parseInteger();
max_time = max(time, max_time);
}
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material', `p1', `p2', `p3', `normal' `time' or }." );
}
}
if(p1.isEmpty() || p2.isEmpty() || p3.isEmpty())
throwParseException( "'triangle' is missing one or more of its vertices");
return new Triangle( material, p1, p2, p3, normal );
}
Object *Parser::parseBoxObject()
{
Material *material = default_material;
int time = 0;
Animation<Point> min;
Animation<Point> _max;
if ( peek( Token::left_brace ) )
{
for ( ; ; )
{
if ( peek( "material" ) )
material = parseMaterial();
else if ( peek( "min" ) || peek( "corner1") )
min.addFrame(time, parsePoint());
else if ( peek( "max" ) || peek( "corner2") )
_max.addFrame((double)time, parsePoint());
else if ( peek( "time" ) )
{
time = parseInteger();
max_time = max(time, max_time);
}
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material', `min', `max', `time' or }." );
}
}
if(min.isEmpty() || _max.isEmpty())
throwParseException( "'box' is missing one or more of its properties `min' or `max'.");
return new Box( material, min, _max);
}
Object *Parser::parseRingObject()
{
Material *material = default_material;
Vector normal( 0.0, 0.0, 1.0 );
double radius = 0;
double radius2 = 0;
Point center( 0.0, 0.0, 0.0 );
if ( peek( Token::left_brace ) )
for ( ; ; )
{
if ( peek( "material" ) )
material = parseMaterial();
else if ( peek( "normal" ) )
normal = parseVector();
else if ( peek( "radius" ) || peek( "radius1") )
radius = parseReal();
else if ( peek( "radius2" ) )
radius2 = parseReal();
else if ( peek( "center" ) )
center = parsePoint();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material', `normal', `radius', `radius2', `'center' or }." );
}
return new Ring( material, normal, radius, radius2, center );
}
Object *Parser::parseDiscObject()
{
Material *material = default_material;
Vector normal( 0.0, 0.0, 1.0 );
double radius = 0;
Point center( 0.0, 0.0, 0.0 );
if ( peek( Token::left_brace ) )
for ( ; ; )
{
if ( peek( "material" ) )
material = parseMaterial();
else if ( peek( "normal" ) )
normal = parseVector();
else if ( peek( "radius" ) )
radius = parseReal();
else if ( peek( "center" ) )
center = parsePoint();
else if ( peek( Token::right_brace ) )
break;
else
throwParseException( "Expected `material', `normal', `radius', `'center' or }." );
}
return new Disc( material, normal, radius, center );
}
Object *Parser::parseObject()
{
if ( peek( "group" ) )
return parseGroupObject();
else if ( peek( "box" ) )
return parseBoxObject();
else if ( peek( "disc" ) || peek( "disk" ))
return parseDiscObject();
else if ( peek( "plane" ) )
return parsePlaneObject();
else if ( peek( "plymodel" ) )
return parsePlyObject();
else if ( peek( "ring" ) )
return parseRingObject();
else if ( peek( "sphere" ) )
return parseSphereObject();
else if ( peek( "triangle" ) )
return parseTriangleObject();
else if ( next_token.token_type == Token::string )
{
map< string, Object * >::iterator found = defined_objects.find( parseString() );
if ( found != defined_objects.end() )
return ( *found ).second;
}
throwParseException( "Expected an object type." );
return 0;
}
Parser::Parser(
istream &input )
: input( input ),
line_number( 1 ),
column_number( 0 ),
default_material( new LambertianMaterial( Color( 1.0, 1.0, 1.0 ), 0.6, 0.3 ) ),
max_time(0)
{
readNextToken();
}
Scene *Parser::parseScene(