How to use lookahead method in Playwright Internal

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parse.js

Source: parse.js Github

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1const inspect = require("util").inspect;
2let ins = (x) => inspect(x, {depth:null});
3let fs = require("fs");
4
5const WHITES = /^(\s|[#;].*|\/\*(.|\n)*?\*\/)*/;
6const STRING = /^"((?:[^"\\]|\\.)*)"/;
7const NUMBER = /^([-+]?\d*\.?\d+([eE][-+]?\d+)?)/;
8const WORD   = /^([^\s(),"]+)/; // No se niega el dígito ni el signo
9const LP     = /^([(])/;
10const RP     = /^\)/;
11const COMMA  = /^(,)/;
12const NEWLINE = /\r\n|\r|\n/;
13
14let program;
15let lookahead;
16let lineno = 1;
17
18let setProgram = function(prg) {
19  program = prg;
20  lineno = 1;
21  return {program, lineno}
22};
23
24let getProgram = function() {
25  return {program, lineno}
26};
27
28
29function lex() {
30    let match;
31
32    match = WHITES.exec(program);
33    if (NEWLINE.test(match[0])) {
34      lineno += match[0].split(NEWLINE).length-1;
35    }
36    program = program.slice(match[0].length);
37
38    if (program.length > 0) {
39      if (match = STRING.exec(program)) {
40        lookahead = { type: "STRING", value: match[1]}
41      } else if (match = NUMBER.exec(program)) {
42        lookahead = {type: "NUMBER", value: Number(match[1])};
43      } else if (match = LP.exec(program)) { 
44        lookahead = {type: "LP", value: match[1]};
45      } else if (match = COMMA.exec(program)) {
46        lookahead = {type: "COMMA", value: match[1]};
47      } else if (match = RP.exec(program)) {
48        lookahead = {type: "RP", value: match[0]};
49      } else if (match = WORD.exec(program)) {
50        lookahead = {type: "WORD", value: match[1]};
51      } else {
52        throw new SyntaxError(`Unexpect syntax line ${lineno}: ${program.slice(0,10)}`);
53      }
54      program = program.slice(match[0].length);
55    }
56    else {
57      lookahead = null; // End of input reached!
58    }
59    return lookahead;
60}
61
62function parseExpression() {
63  let expr;
64
65  // debugger;
66  if (lookahead.type == "STRING") {
67    expr = {type: "value", value: lookahead.value};
68    lex();
69    return expr;
70  } else if (lookahead.type == "NUMBER") {
71    expr = {type: "value", value: lookahead.value};
72    lex();
73    return expr;
74  } else if (lookahead.type == "WORD") {
75    expr = {type: "word", name: lookahead.value};
76    lex();
77    return parseApply(expr);
78  } else {
79    throw new SyntaxError(`Unexpected syntax line ${lineno}: ${program.slice(0,10)}`);
80  }
81}
82
83function parseApply(tree) {
84  // if (!lookahead) return tree;   // apply: /* vacio */
85  // if (lookahead.type !== "LP") return tree; // apply: /* vacio */
86
87  if (!lookahead) return tree; // End of input: apply: /* vacio */
88  if ((lookahead.type === "RP")|| (lookahead.type === 'COMMA')) // apply: /* vacio */
89    return tree;;
90
91  if (lookahead.type !== "LP") throw new SyntaxError(`Error: Found ${lookahead.type}, Expected ',' or '(' or ')'`);
92
93  lex();
94
95  tree = {type: 'apply', operator: tree, args: []};
96  while (lookahead && lookahead.type !== "RP") {
97    let arg = parseExpression();
98    tree.args.push(arg);
99
100    if (lookahead && lookahead.type == "COMMA") {
101      lex();
102    } else if (!lookahead || lookahead.type !== "RP") {
103      throw new SyntaxError(`Expected ',' or ')'  at line ${lineno}: ... ${program.slice(0,20)}`);
104    }
105  }
106  if (!lookahead)  throw new SyntaxError(`Expected ')'  at line ${lineno}: ... ${program.slice(0,20)}`);
107  lex();
108
109  return parseApply(tree);
110}
111
112function parse(p) {
113  setProgram(p);
114  // debugger;
115  lex();
116  let result = parseExpression();
117  //console.log("result = ",inspect(result, {depth: null}));
118  if (lookahead !== null) 
119    throw new SyntaxError(`Unexpected input after reached the end of parsing ${lineno}: ${program.slice(0,10)}`);
120
121  return result;
122}
123
124function parseFromFile(fileName) {
125  try {
126    let program = fs.readFileSync(fileName, 'utf8');
127    let tree = parse(program);
128    let json = JSON.stringify(tree, null, "  ");
129    fs.writeFileSync(fileName+".evm", json);
130  }
131  catch (err) {
132    console.log(err);
133  }
134}
135
136module.exports = {
137  getProgram,
138  lex,
139  parse,
140  parseApply,
141  parseExpression,
142  parseFromFile,
143  setProgram,
144};
145
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T10003903.js

Source: T10003903.js Github

copy
1var i = 0;
2var lookahead = "";
3var token = "";
4var tipo_token = "";
5
6function Numero(str)
7{
8   var checknum = parseInt(str);
9   return !isNaN(checknum);
10}
11
12function Letra(str)
13{
14   switch(str)
15   {
16      case "A":
17      case "B":
18      case "C":
19      case "D":
20      case "E":
21      case "F":
22      case "G":
23      case "H":
24      case "I":
25      case "J":
26      case "K":
27      case "L":
28      case "M":
29      case "N":
30      case "O":
31      case "P":
32      case "Q":
33      case "R":
34      case "S":
35      case "T":
36      case "U":
37      case "V":
38      case "W":
39      case "X":
40      case "Y":
41      case "Z": return (true);
42                break;
43      default: return (false);
44   }
45}
46
47function move_lookahead()
48{
49   i = i + 1;
50
51   if(i - 1 == document.frmEditor.Texto.value.length)
52   {
53      return "#";
54   }
55   else
56   {
57      return document.frmEditor.Texto.value.substr(i - 1, 1).toUpperCase();
58   }
59}
60
61function BuscaProximoToken()
62{
63   token = "";
64
65   while(lookahead == " " || lookahead.charCodeAt(0) == 10 || lookahead.charCodeAt(0) == 13 || lookahead.charCodeAt(0) == 9)
66      lookahead = move_lookahead();
67
68   if(Letra(lookahead))
69   {
70      token = lookahead;
71      lookahead = move_lookahead();
72
73      while(Letra(lookahead) || Numero(lookahead) || lookahead == "_")
74      {
75         token = token + lookahead;
76         lookahead = move_lookahead();
77      }
78      
79      if(token == "VARIAVEIS")
80         tipo_token = "T_VARIAVEIS         ";
81      else
82      if(token == "INICIO")
83         tipo_token = "T_INICIO            ";
84      else
85      if(token == "FIM")
86         tipo_token = "T_FIM               ";
87      else
88      if(token == "ESCREVA")
89         tipo_token = "T_ESCREVA           ";
90      else
91         tipo_token = "T_ID                ";
92   }
93   else
94   {
95      if(Numero(lookahead))
96      {
97         token = "";
98         while(Numero(lookahead))
99         {
100            token = token + lookahead;
101            lookahead = move_lookahead();
102         }
103      
104         tipo_token = "T_NUMERO            ";
105      }
106      else
107      {
108         switch(lookahead)
109         {
110            case ",": token = lookahead;
111                      lookahead = move_lookahead();
112                      tipo_token = "T_VIRGULA           ";
113                      break;
114
115            case ";": token = lookahead;
116                      lookahead = move_lookahead();
117                      tipo_token = "T_PONTO_VIRGULA     ";
118                      break;
119
120            case "+": token = lookahead;
121                      lookahead = move_lookahead();
122                      tipo_token = "T_MAIS              ";
123                      break;
124
125            case "-": token = lookahead;
126                      lookahead = move_lookahead();
127                      tipo_token = "T_MENOS             ";
128                      break;
129
130            case "*": token = lookahead;
131                      lookahead = move_lookahead();
132                      tipo_token = "T_VEZES             ";
133                      break;
134
135            case "/": token = lookahead;
136                      lookahead = move_lookahead();
137                      tipo_token = "T_SOBRE             ";
138                      break;
139
140            case "(": token = lookahead;
141                      lookahead = move_lookahead();
142                      tipo_token = "T_ABREPAR           ";
143                      break;
144
145            case ")": token = lookahead;
146                      lookahead = move_lookahead();
147                      tipo_token = "T_FECHAPAR          ";
148                      break;
149
150            case ":": token = lookahead;
151                      lookahead = move_lookahead();
152                      if(lookahead == "=")
153                      {
154                         token = token + lookahead;
155                         lookahead = move_lookahead();
156                         tipo_token = "T_ATRIBUICAO        ";
157                      }
158                      else
159                         tipo_token = "T_DOIS_PONTOS       ";
160                      break;
161
162            case "=": token = lookahead;
163                      lookahead = move_lookahead();
164                      tipo_token = "T_IGUAL             ";
165                      break;
166
167            case "<": token = lookahead;
168                      lookahead = move_lookahead();
169                      if(lookahead == "=")
170                      {
171                         token = token + lookahead;
172                         lookahead = move_lookahead();
173                         tipo_token = "T_MENOR_IGUAL       ";
174                      }
175                      else
176                      if(lookahead == ">")
177                      {
178                         token = token + lookahead;
179                         lookahead = move_lookahead();
180                         tipo_token = "T_DIFERENTE         ";
181                      }
182                      else
183                         tipo_token = "T_MENOR             ";
184                      break;
185
186            case ">": token = lookahead;
187                      lookahead = move_lookahead();
188                      if(lookahead == "=")
189                      {
190                         token = token + lookahead;
191                         lookahead = move_lookahead();
192                         tipo_token = "T_MAIOR_IGUAL       ";
193                      }
194                      else
195                         tipo_token = "T_MAIOR             ";
196                      break;
197
198            case "#": token = lookahead;
199                      lookahead = move_lookahead();
200                      tipo_token = "T_FIM_FONTE         ";
201                      break;
202
203            default: token = lookahead;
204                     lookahead = move_lookahead();
205                     while(lookahead != " " && lookahead != "#" && lookahead.charCodeAt(0) != 10 && lookahead.charCodeAt(0) != 13 && lookahead.charCodeAt(0) != 9)
206                     {
207                        token = token + lookahead;
208                        lookahead = move_lookahead();
209                     }
210                     tipo_token = "T_ERRO_LEXICO       ";
211         }
212      }
213   }
214}
215
216function Analisa()
217{
218   var resultado = "";
219
220   i = 0;
221
222   lookahead = move_lookahead();
223   BuscaProximoToken();
224   while(tipo_token != "T_FIM_FONTE         ")
225   {
226      resultado = resultado + "<br>Token encontrado: " + tipo_token + " -> '" + token + "'";
227      BuscaProximoToken();
228   }
229   resultado = resultado + "<br>Token encontrado: " + tipo_token + " -> '" + token + "'";
230
231   //document.write("Resultado da an�lise:<BR><PRE>" + resultado + "</PRE>");      
232   document.getElementById('resultado').innerHTML = resultado;
233}
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class_lookahead_a_n_n.js

Source: class_lookahead_a_n_n.js Github

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1var class_lookahead_a_n_n =
2[
3    [ "entry", "struct_lookahead_a_n_n_1_1entry.html", "struct_lookahead_a_n_n_1_1entry" ],
4    [ "point", "struct_lookahead_a_n_n_1_1point.html", "struct_lookahead_a_n_n_1_1point" ],
5    [ "entry", "class_lookahead_a_n_n.html#aa9f7a4ac2a0de9f715ed033989cddbd1", null ],
6    [ "point", "class_lookahead_a_n_n.html#a05ec40384c098abfb52b1d27068b7130", null ],
7    [ "LookaheadANN", "class_lookahead_a_n_n.html#a8dad9151982609ba7121492fbc9c1e8e", null ],
8    [ "~LookaheadANN", "class_lookahead_a_n_n.html#a6a3ee4a4d05880f33b50f6bcf45fbba6", null ],
9    [ "pre_cycle", "class_lookahead_a_n_n.html#aa5fb8cc158d38a690063e5f1dbf57b65", null ],
10    [ "post_cycle", "class_lookahead_a_n_n.html#ae4aedd177125c86bab87b065ef436e7a", null ],
11    [ "get_error", "class_lookahead_a_n_n.html#a803e93e772017cafe8eeea159a193335", null ],
12    [ "record_packet", "class_lookahead_a_n_n.html#ad2411965565f6e8bcebf95ec8109152d", null ],
13    [ "deque_clear", "class_lookahead_a_n_n.html#a093df32811a417287d3f701c4349b794", null ],
14    [ "entry_prepare", "class_lookahead_a_n_n.html#a4c6934403b1ba9a94f00e677f8c3acfc", null ],
15    [ "entry_train", "class_lookahead_a_n_n.html#af7f7ece48cd10cc164fec00be6427a0c", null ],
16    [ "entry_valid", "class_lookahead_a_n_n.html#a2a4ce3ab5ab048de57b8d9176e220495", null ],
17    [ "entry_predict", "class_lookahead_a_n_n.html#ad4e596d38b388769e1d095548d25c684", null ],
18    [ "ann_filename", "class_lookahead_a_n_n.html#a5de3f10ef60a9de2325b5a10361c846f", null ],
19    [ "ann_train", "class_lookahead_a_n_n.html#ad2cf76ca184ae4b5b88fda9e84dd6a65", null ],
20    [ "set_pflog", "class_lookahead_a_n_n.html#a919a3e229c6a82e171d7b22e0fc2e439", null ],
21    [ "inputfilter", "class_lookahead_a_n_n.html#a844ce45872feb8af9e29d1326cbebf68", null ],
22    [ "outputfilter", "class_lookahead_a_n_n.html#ae7fb93c2f106a67f7fca15ef8020b72e", null ],
23    [ "outputdefault", "class_lookahead_a_n_n.html#ac67d064cc8498ff32910706b9d2a85fa", null ],
24    [ "npoint", "class_lookahead_a_n_n.html#aca783a09f05cc9e1079262793a5736cc", null ],
25    [ "nfeature", "class_lookahead_a_n_n.html#a9ba68fb76e80ff47d9500ca6d2246c5e", null ],
26    [ "nanninput", "class_lookahead_a_n_n.html#a5bb35b521d95b2d98c610a8e532a0cbb", null ],
27    [ "nannoutput", "class_lookahead_a_n_n.html#aa17a34d16491815a6c329a775f479403", null ],
28    [ "annlayers", "class_lookahead_a_n_n.html#a27dd9bffe99495d118ecb387d08e0252", null ],
29    [ "annlayersz", "class_lookahead_a_n_n.html#a01e1d6f370630f7bd11b34bf7819c725", null ],
30    [ "mintrainsetsz", "class_lookahead_a_n_n.html#a710a9588c9806260bbb338856f1f2a23", null ],
31    [ "maxtrainepoch", "class_lookahead_a_n_n.html#a5539ce5f0b1c1e5c2134f09b68f7ce50", null ],
32    [ "errmomentum", "class_lookahead_a_n_n.html#ade8a1256f77bee1c30e8db3946f98089", null ],
33    [ "retrainerr", "class_lookahead_a_n_n.html#a692b2e86325f451cba626c0fcab55f26", null ],
34    [ "validinterval", "class_lookahead_a_n_n.html#a5881ed37c4c71a19116bd711f22ce70c", null ],
35    [ "ann", "class_lookahead_a_n_n.html#aa1bbed304661ce892c9f420e432d52c2", null ],
36    [ "sendbuf", "class_lookahead_a_n_n.html#af6099f461af1d6db8d4a893fa84d789e", null ],
37    [ "recvbuf", "class_lookahead_a_n_n.html#ab1ff847a9ecc1daa586da079e17fc02b", null ],
38    [ "history", "class_lookahead_a_n_n.html#a8ef26f30815fe61994a279c2b2d39723", null ],
39    [ "trainset", "class_lookahead_a_n_n.html#a733c8b9f451973041695efa166713821", null ],
40    [ "predicterr", "class_lookahead_a_n_n.html#a7dbef37aa7d61c4dbf8404622dee2d47", null ],
41    [ "lastpredict", "class_lookahead_a_n_n.html#a20fb27fb5203a273d0eb4eae1a1e0ef9", null ],
42    [ "validcount", "class_lookahead_a_n_n.html#aa0ec0ec14ea3d8b2212198d90c8722a4", null ],
43    [ "ve", "class_lookahead_a_n_n.html#a6865634bd149a174807cd272a31889b3", null ],
44    [ "pflog", "class_lookahead_a_n_n.html#ab151ea3c0befc373f2ded05406e4ba48", null ]
45];
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