Lab Session 8 -- A Short Course in Compilers

gem.m

(10 min) Look at gem.m
```
      >> edit gem.c
```

(20 min) Try examples like

      >> G=gem()
      >> G.nowhite
      >> scan=@(txt)G.run(txt, G.nowhite);
      >> scan('x Y z')
      >> parse = G.run('x+x+x', scan(G.sum))
      >> unsum = G.run(scan(G.sum), scan(G.invert))
      >> G.run(unsum, scan(G.pretty))
      >> raw = G.run(parse, unsum)

gem2.m

(10 min) Look at gem2.m
```
      >> edit gem.c
```

(20 min) Try examples like

      >> G=gem2()
      >> G.nowhite
      >> scan=@(txt)G.run(txt, G.nowhite, 'asciiIOG');
      >> scan('x Y z')
      >> scan('"xyz"')    
      >> G.GEM(G.pretty0, 'pretty')