/
parser.y
150 lines (140 loc) · 6.78 KB
/
parser.y
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%define api.prefix {OBJLoader}
%{
//////////////////////////////////////////////////////////////////////////////////////
// Copyright © Charalambos "Charis" Poullis, charalambos@poullis.org //
// http://www.poullis.org //
//////////////////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <string>
#include "OBJLoader.h"
#include "OBJ.h"
extern char *yytext; // The text of most recent token from the scanner.
int yylex( ); // Prototype for yylex,produced by the scanner.
void yyerror(char * s); // Function to print an error message
OBJ *obj_model;
std::vector<int> vertexIndices,normalIndices,textureIndices;
int line_number=1;
//GRAMMAR DEFINITION
%}
%union {
int line_number;
double number;
char comment[1024];
char vertex[1024];
char vertexTexture[1024];
char vertexNormal[1024];
char parameterSpaceVertex[1024];
char degree[1024];
char basisMatrix[1024];
char stepSize[1024];
char curveOrSurfaceType[1024];
char point[1024];
char line[1024];
char face[1024];
char curve[1024];
char curve2D[1024];
char surface[1024];
char parameterValues[1024];
char outerTrimmingLoop[1024];
char innerTrimmingLoop[1024];
char specialCurve[1024];
char specialPoint[1024];
char end[1024];
char _connect[1024];
char groupName[1024];
char smoothingGroup[1024];
char mergingGroup[1024];
char objectName[1024];
char bevelInterpolation[1024];
char colorInterpolation[1024];
char dissolveInterpolation[1024];
char levelOfDetail[1024];
char materialName[1024];
char materialLibrary[1024];
char shadowCasting[1024];
char rayTracing[1024];
char curveApproxTechnique[1024];
char surfaceApproxTechnique[1024];
}
%start parsedLine
%type<line_number> inputLine
%token <number> NUMBER
%token <comment> COMMENT
%token <vertex> VERTEX
%token <vertexTexture> VERTEX_TEXTURE
%token <vertexNormal> VERTEX_NORMAL
%token <parameterSpaceVertex> PARAMETER_SPACE_VERTEX
%token <degree> DEGREE
%token <basisMatrix> BASIS_MATRIX
%token <stepSize> STEP_SIZE
%token <curveOrSurfaceType> CURVE_OR_SURFACE_TYPE
%token <point> POINT
%token <line> LINE
%token <face> FACE
%token <curve> CURVE
%token <curve2D> CURVE_2D
%token <surface> SURFACE
%token <parameterValues> PARAMETER_VALUES
%token <outerTrimmingLoop> OUTER_TRIMMING_LOOP
%token <innerTrimmingLoop> INNER_TRIMMING_LOOP
%token <specialCurve> SPECIAL_CURVE
%token <specialPoint> SPECIAL_POINT
%token <end> END
%token <_connect> CONNECT
%token <groupName> GROUP_NAME
%token <smoothingGroup> SMOOTHING_GROUP
%token <mergingGroup> MERGING_GROUP
%token <objectName> OBJECT_NAME
%token <bevelInterpolation> BEVEL_INTERPOLATION
%token <colorInterpolation> COLOR_INTERPOLATION
%token <dissolveInterpolation> DISSOLVE_INTERPOLATION
%token <levelOfDetail> LEVEL_OF_DETAIL
%token <materialName> MATERIAL_NAME
%token <materialLibrary> MATERIAL_LIBRARY
%token <shadowCasting> SHADOW_CASTING
%token <rayTracing> RAY_TRACING
%token <curveApproxTechnique> CURVE_APPROX_TECHNIQUE
%token <surfaceApproxTechnique> SURFACE_APPROX_TECHNIQUE
%%
parsedLine : parsedLine inputLine { /*printf("YACC: Parsed line: %d\n",$2);*/}
| inputLine { /*printf("YACC: Parsed line: %d\n",$1);*/}
| parsedLine error '\n' { printf("YACC: The file appears to have the wrong format. Quiting on line %d.\n",line_number); return -1; yyerrok;}
| error '\n' { printf("YACC: The file appears to have the wrong format. Quiting on line %d.\n",line_number); return -1; yyerrok;}
| parsedLine '\n' { ; }
| '\n' { ; }
;
inputLine : VERTEX NUMBER NUMBER NUMBER '\n' {/*printf(" v %lf %lf %lf\n",$2,$3,$4);*/$$=line_number++;obj_model->AddVertex($2,$3,$4);}
| VERTEX_TEXTURE NUMBER NUMBER '\n' {/*printf(" vt %lf %lf\n",$2,$3);*/$$=line_number++;obj_model->has_tex_coords=true; obj_model->AddTextureCoord($2,$3);}
| VERTEX_NORMAL NUMBER NUMBER NUMBER '\n' {/*printf(" vn %lf %lf %lf\n",$2,$3,$4);*/$$=line_number++;obj_model->has_normals=true; obj_model->AddNormal($2,$3,$4);}
| face '\n' {$$=line_number++;obj_model->AddFace(vertexIndices,normalIndices,textureIndices); vertexIndices.clear();normalIndices.clear();textureIndices.clear();}
| materialName '\n' {line_number++;}
| materialLibrary '\n' {line_number++;}
| groupName '\n' {line_number++;}
| smoothingGroup '\n' {line_number++;}
| COMMENT '\n' {line_number++; printf("Comment: %s\n",$1);}
;
face : singleFace {/*printf("\n");*/}
| pairFace {/*printf("\n");*/}
| tripletFace {/*printf("\n");*/}
;
tripletFace : tripletFace NUMBER '/' NUMBER '/' NUMBER {/*printf("%lf/%lf/%lf",$2,$4,$6);*/vertexIndices.push_back(int($2)-1);normalIndices.push_back(int($4)-1);textureIndices.push_back(int($6)-1);}
| pairFace '/' NUMBER {/*printf("/%lf",$3);*/textureIndices.push_back(int($3)-1);}
;
pairFace : pairFace NUMBER '/''/' NUMBER {printf("The format appears to be slightly wrong. Fixing...\n"); vertexIndices.push_back(int($2)-1);if (obj_model->has_normals) {normalIndices.push_back(int($5)-1);} else {if (obj_model->has_tex_coords) {textureIndices.push_back(int($5)-1);}}}
| singleFace '/''/' NUMBER {printf("The format appears to be slightly wrong. Fixing...\n"); if (obj_model->has_normals) {normalIndices.push_back(int($4)-1);} else {if (obj_model->has_tex_coords) {textureIndices.push_back(int($4)-1);}}}
| pairFace NUMBER '/' NUMBER {/*printf("%lf/%lf",$2,$4);*/vertexIndices.push_back($2-1);if (obj_model->has_normals) {normalIndices.push_back(int($4)-1);} else {if (obj_model->has_tex_coords) {textureIndices.push_back(int($4)-1);}}}
| singleFace '/' NUMBER {/*printf("/%lf",$3);*/if (obj_model->has_normals) {normalIndices.push_back(int($3)-1);} else {if (obj_model->has_tex_coords) {textureIndices.push_back(int($3)-1);}}}
;
singleFace : singleFace NUMBER {/*printf(" %lf",$2);*/vertexIndices.push_back(int($2)-1);}
| FACE NUMBER {/*printf("f %lf", $2);*/vertexIndices.push_back(int($2)-1);}
;
materialLibrary: MATERIAL_LIBRARY {/*printf("Unsupported command: %s\n",$1);*/}
;
materialName : MATERIAL_NAME {/*printf("Unsupported command: %s\n",$1);*/}
;
groupName : GROUP_NAME {/*printf("Unsupported command: %s\n",$1);*/}
;
smoothingGroup: SMOOTHING_GROUP {/*printf("Unsupported command: %s\n",$1);*/}
;
%%
void yyerror (char *s) {fprintf(stderr, "%s\n", s);}