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%option batch
%option c++
%option noyywrap
%option 8bit
%option stack
%option yyclass="ObjParser"
%option prefix="objbase"
%{
#include <gfx/models/obj.h>
#include <glm/glm.hpp>
#include <memory>
#include <string>
#include <vector>
class objbaseFlexLexer;
%}
comment #.*
float -?[0-9.]+
index -?[0-9]+
linestring [^\r\n]*
truthy (1|on)
falsey (0|off)
%x FACE
%x MTLLIB
%x OBJECT
%x SMOOTH
%x USEMTL
%x VERTEX
%x NORMAL
%x TEXCOORD
%%
<INITIAL>{comment} {
// fprintf(stderr, "COMMENT %s\n", YYText());
}
<INITIAL>"f " {
BEGIN(FACE);
objects.back().second.emplace_back();
objects.back().second.back().emplace_back();
axis = 0;
}
<INITIAL>"mtllib " {
BEGIN(MTLLIB);
}
<INITIAL>"o " {
BEGIN(OBJECT);
}
<INITIAL>"s " {
BEGIN(SMOOTH);
}
<INITIAL>"usemtl " {
BEGIN(USEMTL);
}
<INITIAL>"v " {
BEGIN(VERTEX);
vertices.emplace_back(0, 0, 0, 1);
axis = 0;
}
<INITIAL>"vn " {
BEGIN(NORMAL);
normals.emplace_back(0, 0, 0);
axis = 0;
}
<INITIAL>"vt " {
BEGIN(TEXCOORD);
texCoords.emplace_back(0, 1, 1);
axis = 0;
}
<USEMTL>{linestring} {
// fprintf(stderr, "USEMTL <%s>\n", YYText());
}
<MTLLIB>{linestring} {
// fprintf(stderr, "MTLLIB <%s>\n", YYText());
}
<OBJECT>{linestring} {
objects.emplace_back(YYText(), Faces{});
}
<SMOOTH>{truthy} {
// fprintf(stderr, "Set smooth\n");
}
<SMOOTH>{falsey} {
// fprintf(stderr, "Set flat\n");
}
<VERTEX>{float} {
vertices.back()[axis++] = std::stof(YYText());
}
<NORMAL>{float} {
normals.back()[axis++] = std::stof(YYText());
}
<TEXCOORD>{float} {
texCoords.back()[axis++] = std::stof(YYText());
}
<FACE>{index} {
objects.back().second.back().back()[axis] = std::stoi(YYText());
}
<FACE>\/ {
axis++;
}
<FACE>[ \t] {
objects.back().second.back().emplace_back();
axis = 0;
}
<*>[ \t] {
}
<*>[\r\n\f] {
BEGIN(INITIAL);
}
%%
// Make iwyu think unistd.h is required
[[maybe_unused]]static auto x=getpid;
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