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PROG8.LST

PROG8.LST 13 KB
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  1. Listing:
    2. 

  2. 

  3.     1  MODULE prog8;
    4. 

  4.     2  (* This program implements a simple interactive calculator *)
    5. 

  5.     3  IMPORT IO,Str,Storage;
    6. 

  6.     4  
    7. 

  7.     5  TYPE
    8. 

  8.     6    TokenType = (number, add, sub, mul, div, LeftParen,
    9. 

  9.     7                  RightParen, end);
    10. 

  10.     8    SyntacticType = (main, exp, term, factor);
    11. 

  11.     9    TreeType = POINTER TO TreeRecordType;
    12. 

  12. *****                          ^ undeclared identifier
    13. 

  13.    10  
    14. 

  14.    11    TreeRecordType = RECORD
    15. 

  15.    12      CASE kind:TokenType OF
    16. 

  16. *****      ^ not supported yet
    17. 

  17.    13      | number :
    18. 

  18. *****        ^ not supported yet
    19. 

  19.    14        NumberValue : LONGREAL;
    20. 

  20.    15      | add,sub,mul,div :
    21. 

  21. *****        ^ not supported yet
    22. 

  22. *****            ^ not supported yet
    23. 

  23. *****                ^ not supported yet
    24. 

  24. *****                    ^ not supported yet
    25. 

  25.    16        left : TreeType;
    26. 

  26.    17        right : TreeType;
    27. 

  27.    18      END;
    28. 

  28.    19    END;
    29. 

  29. *****    ^ not supported yet
    30. 

  30.    20  
    31. 

  31.    21  VAR
    32. 

  32.    22    c:CHAR;
    33. 

  33.    23    token:TokenType;
    34. 

  34. *****          ^ not supported yet
    35. 

  35.    24    TokenNumberValue:LONGREAL;
    36. 

  36.    25  
    37. 

  37.    26  PROCEDURE error(s:ARRAY OF CHAR);
    38. 

  38. *****                             ^ not supported yet
    39. 

  39.    27  BEGIN
    40. 

  40.    28    IO.WrStr(s);
    41. 

  41. *****    ^ not supported yet
    42. 

  42. *****       ^ not supported yet
    43. 

  43. *****             ^ not supported yet
    44. 

  44.    29    IO.WrLn;
    45. 

  45. *****    ^ not supported yet
    46. 

  46. *****       ^ not supported yet
    47. 

  47.    30    HALT;
    48. 

  48. *****    ^ undeclared identifier
    49. 

  49.    31  END error;
    50. 

  50. *****      ^ not supported yet
    51. 

  51.    32  
    52. 

  52.    33  PROCEDURE readtoken;
    53. 

  53.    34  VAR
    54. 

  54.    35    s:ARRAY[0..99] OF CHAR;
    55. 

  55. *****               ^ not supported yet
    56. 

  56. *****                      ^ not supported yet
    57. 

  57.    36    i:[0..99];
    58. 

  58.    37    done:BOOLEAN;
    59. 

  59.    38    oldc:CHAR;
    60. 

  60.    39  BEGIN
    61. 

  61.    40    LOOP
    62. 

  62.    41      oldc := c;
    63. 

  63.    42      c := IO.RdChar();
    64. 

  64. *****           ^ not supported yet
    65. 

  65. *****              ^ not supported yet
    66. 

  66. *****                     ^ not supported yet
    67. 

  67.    43      CASE oldc OF
    68. 

  68.    44      | ' ' :
    69. 

  69.    45      | '+' : token := add; EXIT;
    70. 

  70. *****              ^ not supported yet
    71. 

  71. *****                       ^ not supported yet
    72. 

  72.    46      | '-' : token := sub; EXIT;
    73. 

  73. *****              ^ not supported yet
    74. 

  74. *****                       ^ not supported yet
    75. 

  75.    47      | '*' : token := mul; EXIT;
    76. 

  76. *****              ^ not supported yet
    77. 

  77. *****                       ^ not supported yet
    78. 

  78.    48      | '/' : token := div; EXIT;
    79. 

  79. *****              ^ not supported yet
    80. 

  80. *****                       ^ not supported yet
    81. 

  81.    49      | '(' : token := LeftParen; EXIT;
    82. 

  82. *****              ^ not supported yet
    83. 

  83. *****                       ^ not supported yet
    84. 

  84.    50      | ')' : token := RightParen; EXIT;
    85. 

  85. *****              ^ not supported yet
    86. 

  86. *****                       ^ not supported yet
    87. 

  87.    51      | CHAR(10),CHAR(13),CHAR(26) : token := end; EXIT;
    88. 

  88. *****               ^ not supported yet
    89. 

  89. *****                        ^ not supported yet
    90. 

  90. *****                                 ^ not supported yet
    91. 

  91. *****                                     ^ not supported yet
    92. 

  92. *****                                              ^ not supported yet
    93. 

  93.    52  
    94. 

  94.    53      | '0'..'9' : (* read a real number *)
    95. 

  95.    54        i := 1; s[0] := oldc;
    96. 

  96. *****                ^ not supported yet
    97. 

  97. *****                   ^ not supported yet
    98. 

  98.    55        WHILE (c >= '0') AND (c <= '9') DO
    99. 

  99.    56          s[i] := c;
    100. 

  100. *****          ^ not supported yet
    101. 

  101. *****             ^ not supported yet
    102. 

  102.    57          INC(i);
    103. 

  103. *****          ^ undeclared identifier
    104. 

  104. *****               ^ not supported yet
    105. 

  105.    58          c := IO.RdChar();
    106. 

  106. *****               ^ not supported yet
    107. 

  107. *****                  ^ not supported yet
    108. 

  108. *****                         ^ not supported yet
    109. 

  109.    59        END;
    110. 

  110.    60        IF c<>'.' THEN (* add decimal point if none in input *)
    111. 

  111.    61          s[i] := '.';
    112. 

  112. *****          ^ not supported yet
    113. 

  113. *****             ^ not supported yet
    114. 

  114.    62          INC(i);
    115. 

  115. *****          ^ undeclared identifier
    116. 

  116. *****               ^ not supported yet
    117. 

  117.    63        ELSE
    118. 

  118.    64          REPEAT (* read fraction part *)
    119. 

  119.    65            s[i] := c;
    120. 

  120. *****            ^ not supported yet
    121. 

  121. *****               ^ not supported yet
    122. 

  122.    66            INC(i);
    123. 

  123. *****            ^ undeclared identifier
    124. 

  124. *****                 ^ not supported yet
    125. 

  125.    67            c := IO.RdChar();
    126. 

  126. *****                 ^ not supported yet
    127. 

  127. *****                    ^ not supported yet
    128. 

  128. *****                           ^ not supported yet
    129. 

  129.    68          UNTIL (c < '0') OR (c > '9');
    130. 

  130.    69        END;
    131. 

  131.    70        s[i] := CHAR(0);
    132. 

  132. *****        ^ not supported yet
    133. 

  133. *****           ^ not supported yet
    134. 

  134. *****                      ^ not supported yet
    135. 

  135.    71        TokenNumberValue := Str.StrToReal(s, done);
    136. 

  136. *****                            ^ not supported yet
    137. 

  137. *****                                ^ not supported yet
    138. 

  138. *****                                          ^ not supported yet
    139. 

  139. *****                                                 ^ not supported yet
    140. 

  140.    72        IF NOT done THEN
    141. 

  141.    73          error('Bad number?');
    142. 

  142. *****          ^ not supported yet
    143. 

  143. *****                ^ not supported yet
    144. 

  144.    74        END;
    145. 

  145.    75        token := number;
    146. 

  146. *****        ^ not supported yet
    147. 

  147. *****                 ^ not supported yet
    148. 

  148.    76        EXIT;
    149. 

  149.    77      ELSE
    150. 

  150.    78        error('Bad character');
    151. 

  151. *****        ^ not supported yet
    152. 

  152. *****              ^ not supported yet
    153. 

  153.    79      END;
    154. 

  154.    80    END;
    155. 

  155.    81  END readtoken;
    156. 

  156. *****      ^ not supported yet
    157. 

  157.    82  
    158. 

  158.    83  PROCEDURE read(what:SyntacticType):TreeType;
    159. 

  159.    84  VAR t,t1:TreeType;
    160. 

  160. *****           ^ not supported yet
    161. 

  161.    85  BEGIN
    162. 

  162.    86    CASE what OF
    163. 

  163. *****         ^ not supported yet
    164. 

  164.    87    | factor :
    165. 

  165. *****      ^ not supported yet
    166. 

  166.    88      IF token = LeftParen THEN
    167. 

  167. *****         ^ not supported yet
    168. 

  168. *****                 ^ not supported yet
    169. 

  169.    89        readtoken;
    170. 

  170. *****        ^ not supported yet
    171. 

  171.    90        t := read(exp);
    172. 

  172. *****        ^ not supported yet
    173. 

  173. *****             ^ not supported yet
    174. 

  174. *****                  ^ not supported yet
    175. 

  175.    91        IF token = RightParen THEN
    176. 

  176. *****           ^ not supported yet
    177. 

  177. *****                   ^ not supported yet
    178. 

  178.    92          readtoken;
    179. 

  179. *****          ^ not supported yet
    180. 

  180.    93        ELSE
    181. 

  181.    94          error("Missing ')'");
    182. 

  182. *****          ^ not supported yet
    183. 

  183. *****                ^ not supported yet
    184. 

  184.    95        END;
    185. 

  185.    96      ELSIF token = number THEN
    186. 

  186. *****            ^ not supported yet
    187. 

  187. *****                    ^ not supported yet
    188. 

  188.    97        Storage.ALLOCATE(t, SIZE(t^));
    189. 

  189. *****        ^ not supported yet
    190. 

  190. *****                ^ not supported yet
    191. 

  191. *****                         ^ not supported yet
    192. 

  192. *****                            ^ undeclared identifier
    193. 

  193. *****                                 ^ not supported yet
    194. 

  194.    98        t^.kind := number;
    195. 

  195. *****        ^ not supported yet
    196. 

  196. *****           ^ not supported yet
    197. 

  197. *****                   ^ not supported yet
    198. 

  198.    99        t^.NumberValue := TokenNumberValue;
    199. 

  199. *****        ^ not supported yet
    200. 

  200. *****           ^ not supported yet
    201. 

  201.   100        readtoken;
    202. 

  202. *****        ^ not supported yet
    203. 

  203.   101      ELSE
    204. 

  204.   102        error('Missing number?');
    205. 

  205. *****        ^ not supported yet
    206. 

  206. *****              ^ not supported yet
    207. 

  207.   103      END;
    208. 

  208.   104    | term:
    209. 

  209. *****      ^ not supported yet
    210. 

  210.   105      t := read(factor);
    211. 

  211. *****      ^ not supported yet
    212. 

  212. *****           ^ not supported yet
    213. 

  213. *****                ^ not supported yet
    214. 

  214.   106      WHILE (token = mul) OR (token = div) DO
    215. 

  215. *****             ^ not supported yet
    216. 

  216. *****                     ^ not supported yet
    217. 

  217. *****                              ^ not supported yet
    218. 

  218. *****                                      ^ not supported yet
    219. 

  219.   107        t1 := t;
    220. 

  220. *****        ^ not supported yet
    221. 

  221. *****              ^ not supported yet
    222. 

  222.   108        Storage.ALLOCATE(t, SIZE(t^));
    223. 

  223. *****        ^ not supported yet
    224. 

  224. *****                ^ not supported yet
    225. 

  225. *****                         ^ not supported yet
    226. 

  226. *****                            ^ undeclared identifier
    227. 

  227. *****                                 ^ not supported yet
    228. 

  228.   109        t^.kind := token;
    229. 

  229. *****        ^ not supported yet
    230. 

  230. *****           ^ not supported yet
    231. 

  231. *****                   ^ not supported yet
    232. 

  232.   110        readtoken;
    233. 

  233. *****        ^ not supported yet
    234. 

  234.   111        t^.left := t1;
    235. 

  235. *****        ^ not supported yet
    236. 

  236. *****           ^ not supported yet
    237. 

  237. *****                   ^ not supported yet
    238. 

  238.   112        t^.right := read(factor);
    239. 

  239. *****        ^ not supported yet
    240. 

  240. *****           ^ not supported yet
    241. 

  241. *****                    ^ not supported yet
    242. 

  242. *****                         ^ not supported yet
    243. 

  243.   113      END;
    244. 

  244.   114    | exp:
    245. 

  245. *****      ^ not supported yet
    246. 

  246.   115      t := read(term);
    247. 

  247. *****      ^ not supported yet
    248. 

  248. *****           ^ not supported yet
    249. 

  249. *****                ^ not supported yet
    250. 

  250.   116      WHILE (token = add) OR (token = sub) DO
    251. 

  251. *****             ^ not supported yet
    252. 

  252. *****                     ^ not supported yet
    253. 

  253. *****                              ^ not supported yet
    254. 

  254. *****                                      ^ not supported yet
    255. 

  255.   117        t1 := t;
    256. 

  256. *****        ^ not supported yet
    257. 

  257. *****              ^ not supported yet
    258. 

  258.   118        Storage.ALLOCATE(t, SIZE(t^));
    259. 

  259. *****        ^ not supported yet
    260. 

  260. *****                ^ not supported yet
    261. 

  261. *****                         ^ not supported yet
    262. 

  262. *****                            ^ undeclared identifier
    263. 

  263. *****                                 ^ not supported yet
    264. 

  264.   119        t^.kind := token;
    265. 

  265. *****        ^ not supported yet
    266. 

  266. *****           ^ not supported yet
    267. 

  267. *****                   ^ not supported yet
    268. 

  268.   120        readtoken;
    269. 

  269. *****        ^ not supported yet
    270. 

  270.   121        t^.left := t1;
    271. 

  271. *****        ^ not supported yet
    272. 

  272. *****           ^ not supported yet
    273. 

  273. *****                   ^ not supported yet
    274. 

  274.   122        t^.right := read(term);
    275. 

  275. *****        ^ not supported yet
    276. 

  276. *****           ^ not supported yet
    277. 

  277. *****                    ^ not supported yet
    278. 

  278. *****                         ^ not supported yet
    279. 

  279.   123      END;
    280. 

  280.   124    | main :
    281. 

  281. *****      ^ not supported yet
    282. 

  282.   125      c := IO.RdChar();
    283. 

  283. *****           ^ not supported yet
    284. 

  284. *****              ^ not supported yet
    285. 

  285. *****                     ^ not supported yet
    286. 

  286.   126      readtoken;
    287. 

  287. *****      ^ not supported yet
    288. 

  288.   127      t := read(exp);
    289. 

  289. *****      ^ not supported yet
    290. 

  290. *****           ^ not supported yet
    291. 

  291. *****                ^ not supported yet
    292. 

  292.   128      IF (token <> end) THEN
    293. 

  293. *****          ^ not supported yet
    294. 

  294. *****                   ^ not supported yet
    295. 

  295.   129        error('Missing operator?');
    296. 

  296. *****        ^ not supported yet
    297. 

  297. *****              ^ not supported yet
    298. 

  298.   130      END;
    299. 

  299.   131    END;
    300. 

  300.   132    RETURN t;
    301. 

  301. *****           ^ not supported yet
    302. 

  302.   133  END read;
    303. 

  303. *****      ^ not supported yet
    304. 

  304.   134  
    305. 

  305.   135  PROCEDURE eval(t:TreeType):LONGREAL;
    306. 

  306.   136  BEGIN
    307. 

  307.   137    CASE t^.kind OF
    308. 

  308. *****         ^ not supported yet
    309. 

  309. *****            ^ not supported yet
    310. 

  310.   138    | number : RETURN t^.NumberValue;
    311. 

  311. *****      ^ not supported yet
    312. 

  312. *****                      ^ not supported yet
    313. 

  313. *****                         ^ not supported yet
    314. 

  314.   139    | add : RETURN eval(t^.left) + eval(t^.right);
    315. 

  315. *****      ^ not supported yet
    316. 

  316. *****                   ^ not supported yet
    317. 

  317. *****                        ^ not supported yet
    318. 

  318. *****                           ^ not supported yet
    319. 

  319. *****                                   ^ not supported yet
    320. 

  320. *****                                        ^ not supported yet
    321. 

  321. *****                                           ^ not supported yet
    322. 

  322.   140    | sub : RETURN eval(t^.left) - eval(t^.right);
    323. 

  323. *****      ^ not supported yet
    324. 

  324. *****                   ^ not supported yet
    325. 

  325. *****                        ^ not supported yet
    326. 

  326. *****                           ^ not supported yet
    327. 

  327. *****                                   ^ not supported yet
    328. 

  328. *****                                        ^ not supported yet
    329. 

  329. *****                                           ^ not supported yet
    330. 

  330.   141    | mul : RETURN eval(t^.left) * eval(t^.right);
    331. 

  331. *****      ^ not supported yet
    332. 

  332. *****                   ^ not supported yet
    333. 

  333. *****                        ^ not supported yet
    334. 

  334. *****                           ^ not supported yet
    335. 

  335. *****                                   ^ not supported yet
    336. 

  336. *****                                        ^ not supported yet
    337. 

  337. *****                                           ^ not supported yet
    338. 

  338.   142    | div : RETURN eval(t^.left) / eval(t^.right);
    339. 

  339. *****      ^ not supported yet
    340. 

  340. *****                   ^ not supported yet
    341. 

  341. *****                        ^ not supported yet
    342. 

  342. *****                           ^ not supported yet
    343. 

  343. *****                                   ^ not supported yet
    344. 

  344. *****                                        ^ not supported yet
    345. 

  345. *****                                           ^ not supported yet
    346. 

  346.   143    END;
    347. 

  347.   144  END eval;
    348. 

  348. *****      ^ not supported yet
    349. 

  349.   145  
    350. 

  350.   146  VAR
    351. 

  351.   147    t:TreeType;
    352. 

  352. *****      ^ not supported yet
    353. 

  353.   148    result:LONGREAL;
    354. 

  354.   149  BEGIN
    355. 

  355.   150    LOOP
    356. 

  356.   151      IO.WrStr('Enter expression : ');
    357. 

  357. *****      ^ not supported yet
    358. 

  358. *****         ^ not supported yet
    359. 

  359. *****               ^ not supported yet
    360. 

  360.   152      t := read(main);
    361. 

  361. *****      ^ not supported yet
    362. 

  362. *****           ^ not supported yet
    363. 

  363. *****                ^ not supported yet
    364. 

  364.   153      result := eval(t);
    365. 

  365. *****                ^ not supported yet
    366. 

  366. *****                     ^ not supported yet
    367. 

  367.   154      IO.WrStr(' = ');
    368. 

  368. *****      ^ not supported yet
    369. 

  369. *****         ^ not supported yet
    370. 

  370. *****               ^ not supported yet
    371. 

  371.   155      IO.WrLngReal(result, 4, 0);
    372. 

  372. *****      ^ not supported yet
    373. 

  373. *****         ^ not supported yet
    374. 

  374. *****                               ^ not supported yet
    375. 

  375.   156      IO.WrLn;
    376. 

  376. *****      ^ not supported yet
    377. 

  377. *****         ^ not supported yet
    378. 

  378.   157    END;
    379. 

  379.   158  END prog8.
    380. 

  380. 

  381.   219 errors
    382. 

  382. 

  383.