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path: root/web/yacco2/diagrams/o2_Toverview.mp
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% file: o2_Toverview.mp
% enumeration and the 4 T classes
input boxes
u:=1cc;
pair sep,fldsep;
sep := (0,3u);
fldsep := (2u,0);
beginfig(1);
boxit.tclass(btex Terminal vocabulary etex); % enumeration
boxit.enum(btex enumeration etex); % enumeration
boxit.lr(btex lrk meta-terminal constants etex); % lrk
boxit.rc(btex raw characters etex); % raw characters
boxit.err(btex errors etex); % error tokens
boxit.t(btex terminals etex); % basic terminal tokens

% place the boxes
enum.e + fldsep = lr.w;
lr.e + fldsep = rc.w;
rc.e + fldsep = t.w;
t.e + fldsep = err.w;
ypart enum.n = ypart lr.n = ypart rc.n  = ypart t.n = ypart err.n;




drawboxed(enum);
drawboxed(lr); 
drawboxed(rc);
drawboxed(t);
drawboxed(err);

.5[tclass.e,tclass.w] - sep = .5[enum.e,err.w];
drawboxed(tclass);
numeric a;
a := ypart tclass.c - ypart .5sep;

draw tclass.s -- (xpart tclass.s, a);
draw (xpart enum.n,a) -- (xpart err.n,a); % horozontal line
drawarrow (xpart enum.n,a) -- enum.n; 
drawarrow (xpart lr.n,a) -- lr.n; 
drawarrow (xpart rc.n,a) -- rc.n;
drawarrow (xpart t.n,a) -- t.n;
drawarrow (xpart err.n,a) -- err.n;
endfig;
end;