parser.js

   1 // ER diagram description parser
   2 class ErDiags
   3 {
   4     constructor(description)
   5     {
   6         this.entities = {};
   7         this.inheritances = [];
   8         this.associations = [];
   9         this.txt2json(description);
  10         this.tables = [];
  11         // Cache SVG graphs returned by server (in addition to server cache = good perfs)
  12         this.mcdGraph = "";
  13         this.mldGraph = "";
  14         this.sqlText = "";
  15     }
  16
  17     static get TYPES()
  18     {
  19         // SQLite storage classes without null
  20         return ["integer","real","text","blob"];
  21     }
  22
  23     static get CARDINAL()
  24     {
  25         return {
  26             "*": "0,n",
  27             "+": "1,n",
  28             "?": "0,1",
  29             "1": "1,1"
  30         };
  31     }
  32
  33     //////////////////
  34     // PARSING STAGE 1
  35     //////////////////
  36
  37     // Parse a textual description into a json object
  38     txt2json(text)
  39     {
  40         let lines = text.split("\n");
  41         lines.push(""); //easier parsing: always empty line at the end
  42         let start = -1;
  43         for (let i=0; i < lines.length; i++)
  44         {
  45             lines[i] = lines[i].trim();
  46             // Empty line ?
  47             if (lines[i].length == 0)
  48             {
  49                 if (start >= 0) //there is some group of lines to parse
  50                 {
  51                     this.parseThing(lines, start, i);
  52                     start = -1;
  53                 }
  54             }
  55             else //not empty line: just register starting point
  56             {
  57                 if (start < 0)
  58                     start = i;
  59             }
  60         }
  61     }
  62
  63     // Parse a group of lines into entity, association, ...
  64     parseThing(lines, start, end) //start included, end excluded
  65     {
  66         switch (lines[start].charAt(0))
  67         {
  68             case '[':
  69                 // Entity = { name: { attributes, [weak] } }
  70                 let name = lines[start].match(/[^\[\]\s]+/)[0];
  71                 let entity = { attributes: this.parseAttributes(lines, start+1, end) };
  72                 if (lines[start].charAt(1) == '[')
  73                     entity.weak = true;
  74                 this.entities[name] = entity;
  75                 break;
  76             case 'i': //inheritance (arrows)
  77                 this.inheritances = this.inheritances.concat(this.parseInheritance(lines, start+1, end));
  78                 break;
  79             case '{': //association
  80                 // Association = { [name], [attributes], [weak], entities: ArrayOf entity indices }
  81                 let relationship = { };
  82                 let nameRes = lines[start].match(/[^{}\s]+/);
  83                 if (nameRes !== null)
  84                     relationship.name = nameRes[0];
  85                 if (lines[start].charAt(1) == '{')
  86                     relationship.weak = true;
  87                 this.associations.push(Object.assign({}, relationship, this.parseAssociation(lines, start+1, end)));
  88                 break;
  89         }
  90     }
  91
  92     // attributes: ArrayOf {name, [isKey], [type], [qualifiers]}
  93     parseAttributes(lines, start, end)
  94     {
  95         let attributes = [];
  96         for (let i=start; i<end; i++)
  97         {
  98             let field = { };
  99             let line = lines[i];
 100             if (line.charAt(0) == '#')
 101             {
 102                 field.isKey = true;
 103                 line = line.slice(1);
 104             }
 105             field.name = line.match(/[^()\s]+/)[0];
 106             let parenthesis = line.match(/\((.+)\)/);
 107             if (parenthesis !== null)
 108             {
 109                 let sqlClues = parenthesis[1];
 110                 let qualifiers = sqlClues;
 111                 let firstWord = sqlClues.match(/[^\s]+/)[0];
 112                 if (ErDiags.TYPES.includes(firstWord))
 113                 {
 114                     field.type = firstWord;
 115                     qualifiers = sqlClues.substring(firstWord.length).trim();
 116                 }
 117                 field.qualifiers = qualifiers;
 118             }
 119             attributes.push(field);
 120         }
 121         return attributes;
 122     }
 123
 124     // GroupOf Inheritance: { parent, children: ArrayOf entity indices }
 125     parseInheritance(lines, start, end)
 126     {
 127         let inheritance = [];
 128         for (let i=start; i<end; i++)
 129         {
 130             let lineParts = lines[i].split(" ");
 131             let children = [];
 132             for (let j=1; j<lineParts.length; j++)
 133                 children.push(lineParts[j]);
 134             inheritance.push({ parent:lineParts[0], children: children });
 135         }
 136         return inheritance;
 137     }
 138
 139     // Association (parsed here): { entities: ArrayOf entity names + cardinality, [attributes: ArrayOf {name, [isKey], [type], [qualifiers]}] }
 140     parseAssociation(lines, start, end)
 141     {
 142         let assoce = { };
 143         let entities = [];
 144         let i = start;
 145         while (i < end)
 146         {
 147             if (lines[i].charAt(0) == '-')
 148             {
 149                 assoce.attributes = this.parseAttributes(lines, i+1, end);
 150                 break;
 151             }
 152             else
 153             {
 154                 // Read entity name + cardinality
 155                 let lineParts = lines[i].split(" ");
 156                 entities.push({ name:lineParts[0], card:lineParts[1] });
 157             }
 158             i++;
 159         }
 160         assoce.entities = entities;
 161         return assoce;
 162     }
 163
 164     //////////////////
 165     // PARSING STAGE 2
 166     //////////////////
 167
 168     static AjaxGet(dotInput, callback)
 169     {
 170         let xhr = new XMLHttpRequest();
 171         xhr.onreadystatechange = function() {
 172             if (this.readyState == 4 && this.status == 200)
 173                 callback(this.responseText);
 174         };
 175         xhr.open("GET", "scripts/getGraphSvg.php?dot=" + encodeURIComponent(dotInput), true);
 176         xhr.send();
 177     }
 178
 179     // "Modèle conceptuel des données". TODO: option for graph size
 180     // NOTE: randomizing helps to obtain better graphs (sometimes)
 181     drawMcd(id, mcdStyle) //mcdStyle: bubble, or compact
 182     {
 183         let element = document.getElementById(id);
 184         mcdStyle = mcdStyle || "compact";
 185         if (this.mcdGraph.length > 0)
 186         {
 187             element.innerHTML = this.mcdGraph;
 188             return;
 189         }
 190         // Build dot graph input
 191         let mcdDot = 'graph {\n';
 192         mcdDot += 'rankdir="LR";\n';
 193         // Nodes:
 194         if (mcdStyle == "compact")
 195             mcdDot += "node [shape=plaintext];\n";
 196         _.shuffle(Object.keys(this.entities)).forEach( name => {
 197             if (mcdStyle == "bubble")
 198             {
 199                 mcdDot += name + '[shape=rectangle, label="' + name + '"';
 200                 if (this.entities[name].weak)
 201                     mcdDot += ', peripheries=2';
 202                 mcdDot += '];\n';
 203                 if (!!this.entities[name].attributes)
 204                 {
 205                     _.shuffle(this.entities[name].attributes).forEach( a => {
 206                         let label = (a.isKey ? '#' : '') + a.name;
 207                         let attrName = name + '_' + a.name;
 208                         mcdDot += attrName + '[shape=ellipse, label="' + label + '"];\n';
 209                         if (Math.random() < 0.5)
 210                             mcdDot += attrName + ' -- ' + name + ';\n';
 211                         else
 212                             mcdDot += name + ' -- ' + attrName + ';\n';
 213                     });
 214                 }
 215             }
 216             else
 217             {
 218                 mcdDot += name + '[label=<';
 219                 if (this.entities[name].weak)
 220                 {
 221                     mcdDot += '<table port="name" BORDER="1" ALIGN="LEFT" CELLPADDING="0" CELLSPACING="3" CELLBORDER="0">' +
 222                         '<tr><td><table BORDER="1" ALIGN="LEFT" CELLPADDING="5" CELLSPACING="0">\n';
 223                 }
 224                 else
 225                     mcdDot += '<table port="name" BORDER="1" ALIGN="LEFT" CELLPADDING="5" CELLSPACING="0">\n';
 226                 mcdDot += '<tr><td BGCOLOR="#ae7d4e" BORDER="0"><font COLOR="#FFFFFF">' + name + '</font></td></tr>\n';
 227                 if (!!this.entities[name].attributes)
 228                 {
 229                     this.entities[name].attributes.forEach( a => {
 230                         let label = (a.isKey ? '<u>' : '') + a.name + (a.isKey ? '</u>' : '');
 231                         mcdDot += '<tr><td BGCOLOR="#FFFFFF" BORDER="0" ALIGN="LEFT"><font COLOR="#000000" >' + label + '</font></td></tr>\n';
 232                     });
 233                 }
 234                 mcdDot += '</table>';
 235                 if (this.entities[name].weak)
 236                     mcdDot += '</td></tr></table>';
 237                 mcdDot += '>];\n';
 238             }
 239         });
 240         // Inheritances:
 241         this.inheritances.forEach( i => {
 242             _.shuffle(i.children).forEach( c => {
 243                 if (Math.random() < 0.5)
 244                     mcdDot += c + ':name -- ' + i.parent;
 245                 else
 246                     mcdDot += i.parent + ':name -- ' + c;
 247                 mcdDot += ':name [dir="forward", arrowhead="vee", style="dashed"];\n';
 248             });
 249         });
 250         // Relationships:
 251         let assoceCounter = 0;
 252         _.shuffle(this.associations).forEach( a => {
 253             let name = !!a.name && a.name.length > 0
 254                 ? a.name
 255                 : '_assoce' + assoceCounter++;
 256             mcdDot += name + '[shape="diamond", style="filled", color="lightgrey", label="' + (!!a.name ? a.name : '') + '"';
 257             if (a.weak)
 258                 mcdDot += ', peripheries=2';
 259             mcdDot += '];\n';
 260             _.shuffle(a.entities).forEach( e => {
 261                 if (Math.random() < 0.5)
 262                     mcdDot += e.name + ':name -- ' + name;
 263                 else
 264                     mcdDot += name + ' -- ' + e.name + ':name';
 265                 mcdDot += '[label="' + ErDiags.CARDINAL[e.card] + '"];\n';
 266             });
 267             if (!!a.attributes)
 268             {
 269                 _.shuffle(a.attributes).forEach( attr => {
 270                     let label = (attr.isKey ? '#' : '') + attr.name;
 271                     mcdDot += name + '_' + attr.name + '[shape=ellipse, label="' + label + '"];\n';
 272                     let attrName = name + '_' + attr.name;
 273                     if (Math.random() < 0.5)
 274                         mcdDot += attrName + ' -- ' + name + ';\n';
 275                     else
 276                         mcdDot += name + ' -- ' + attrName + ';\n';
 277                 });
 278             }
 279         });
 280         mcdDot += '}';
 281         console.log(mcdDot);
 282         ErDiags.AjaxGet(mcdDot, graphSvg => {
 283             this.mcdGraph = graphSvg;
 284             element.innerHTML = graphSvg;
 285         });
 286     }
 287
 288     // "Modèle logique des données"
 289     // TODO: this one should draw links from foreign keys to keys (port=... in <TD>)
 290     drawMld(id)
 291     {
 292         let element = document.getElementById(id);
 293         if (this.mldGraph.length > 0)
 294         {
 295             element.innerHTML = this.mcdGraph;
 296             return;
 297         }
 298         // Build dot graph input
 299         let mldDot = 'graph {\n';
 300         // Nodes:
 301         Object.keys(this.entities).forEach( name => {
 302             //mld. ... --> devient table
 303             // mldDot = ...
 304         });
 305         // Relationships:
 306         this.associations.forEach( a => {
 307             a.entities.forEach( e => { // e.card e.name ...
 308                 // Pass 1 : entites deviennent tables
 309                 // Pass 2 : sur les assoces
 310                 // multi-arite : sub-loop si 0,1 ou 1,1 : aspiré comme attribut de l'association (phase 1)
 311                 // ensuite, que du 0,n ou 1,n : si == 1, OK une table
 312                 // si 2 ou + : n tables + 1 pour l'assoce, avec attrs clés étrangères
 313                 // clé étrangère NOT NULL si 1,1
 314             });
 315         });
 316         // this.graphMld = ...
 317         //console.log(mldDot);
 318         ErDiags.AjaxGet(mldDot, graphSvg => {
 319             this.mldGraph = graphSvg;
 320             element.innerHTML = graphSvg;
 321         });
 322     }
 323
 324     fillSql(id)
 325     {
 326         let element = document.getElementById(id);
 327         if (this.sqlText.length > 0)
 328         {
 329             element.innerHTML = this.sqlText;
 330             return;
 331         }
 332         //UNIMPLEMENTED (should be straightforward from MLD)
 333     }
 334 }