spec/sm/parser.tex

   1 \documentclass{minimal}
   2 \pagestyle{empty}
   3
   4 \usepackage{pstricks}
   5 \usepackage{pst-node}
   6
   7 \begin{document}
   8
   9 \begin{psmatrix}[mnode=oval, colsep=1.95cm, rowsep=1cm]
  10 [mnode=R,name=vars]{\shortstack[l]{int s, z, c,\\\, strich, punkt;\\opcode aktop,opp;}} &
  11 [name=int]{\shortstack{\textbf{int}\\z:=z*10\\+(c-'0');}} &
  12 [name=blank]{\shortstack{\textbf{blank}}} \\
  13 %%
  14 [mnode=R,name=res]{sys\_res} &
  15 [name=sign]{\shortstack{\textbf{sign}\\s:=-1;}} &
  16 [name=null]{\shortstack{\textbf{null}\\aktop:=DONE;}} \\
  17 %%
  18 [name=idle]{\shortstack{\textbf{idle}\\strich:=0;\\punkt:=1;\\opp:=NOP;}} &
  19 [name=read]{\shortstack{\textbf{read char}\\z:=0;\\s:=1;}} &
  20 [name=calc]{
  21         \shortstack{
  22                 \textbf{calc}\\
  23                 siehe Listing
  24         }
  25 } \\
  26 %%
  27 [mnode=R,name=void]{} &
  28 [name=err]{\shortstack{\textbf{error}}} &
  29 [name=done]{\shortstack{\textbf{done}}} \\
  30 \end{psmatrix}
  31
  32 \psset{arrows=->, shortput=nab}
  33
  34 \ncline[linestyle=dotted]{res}{idle}
  35 \ncline[linestyle=dotted]{void}{err}
  36 \ncarc[arcangle=0]{done}{idle}
  37 \ncarc[arcangle=0]{err}{idle}
  38
  39 \ncarc[arcangle=0]{idle}{read}\ncput*[npos=.50]{do\_it$\uparrow$}
  40 \nccurve[angleA=45,angleB=75,ncurvA=2,ncurvB=2]{read}{read}\ncput*{' '}
  41 \ncarc[arcangle=0]{read}{sign}\ncput*[npos=.50]{'-'}
  42
  43 \ncarc[arcangle=0]{sign}{int}
  44 \ncarc[arcangle=50]{read}{int}\ncput*[npos=.35]{c = '0'\dots{}'9'}
  45 \nccircle[angleA=0]{int}{.78cm}\ncput*[npos=0.5]{c = '0'\dots{}'9'}
  46
  47 \ncarc[arcangle=15]{int}{blank}\ncput*[npos=.50]{' '}
  48 \nccircle[angleA=0]{blank}{.70cm}\ncput*[npos=0.5]{' '}
  49
  50 \ncarc[arcangle=67]{blank}{calc}\ncput*[npos=.80]{aktop = '+','-','*','/'}
  51 \ncarc[arcangle=0]{blank}{null}\ncput*[npos=.50]{aktop = '\textbackslash 0'}
  52
  53 \ncarc[arcangle=0]{int}{calc}\ncput*[npos=.70]{aktop = '+','-','*','/'}
  54 \ncarc[arcangle=0]{int}{null}\ncput*[npos=.50]{aktop = '\textbackslash 0'}
  55 \ncarc[arcangle=0]{null}{calc}
  56
  57 \ncarc[arcangle=0]{calc}{read}\ncput*[npos=.45]{else}
  58 \ncarc[arcangle=0]{calc}{done}\ncput*[npos=.50]{aktop = DONE}
  59 \end{document}