Add debugging capabilities

README.md

@@ -167,6 +167,23 @@ console.log(table.toString());
 //frobnicate bar quuz
 ```
 
+## Debugging
+
+Later versions of cli-table3 supporting debugging your table data.
+
+Enable and use debugging:
+
+```
+var table = new Table({ debug: 1 });
+table.push([{}, {},}); // etc.
+
+console.log(table.toString());
+table.messages.forEach((message) => console.log(message));
+```
+
+If you are rendering multiple tables with debugging on run `Table.reset()` after
+rendering each table.
+
 ## Build Targets
 
 Clone the repository and run `yarn install` to install all its submodules, then run one of the following commands:

src/cell.js

@@ -1,3 +1,4 @@
+const { info, debug } = require('./debug');
 const utils = require('./utils');
 
 class Cell {
@@ -111,6 +112,12 @@ class Cell {
   draw(lineNum, spanningCell) {
     if (lineNum == 'top') return this.drawTop(this.drawRight);
     if (lineNum == 'bottom') return this.drawBottom(this.drawRight);
+    let content = utils.truncate(this.content, 10, this.truncate);
+    if (!lineNum) {
+      info(`${this.y}-${this.x}: ${this.rowSpan - lineNum}x${this.colSpan} Cell ${content}`);
+    } else {
+      // debug(`${lineNum}-${this.x}: 1x${this.colSpan} RowSpanCell ${content}`);
+    }
     let padLen = Math.max(this.height - this.lines.length, 0);
     let padTop;
     switch (this.vAlign) {
@@ -286,7 +293,10 @@ class ColSpanCell {
    */
   constructor() {}
 
-  draw() {
+  draw(lineNum) {
+    if (typeof lineNum === 'number') {
+      debug(`${this.y}-${this.x}: 1x1 ColSpanCell`);
+    }
     return '';
   }
 
@@ -320,6 +330,7 @@ class RowSpanCell {
     if (lineNum == 'bottom') {
       return this.originalCell.draw('bottom');
     }
+    debug(`${this.y}-${this.x}: 1x${this.colSpan} RowSpanCell for ${this.originalCell.content}`);
     return this.originalCell.draw(this.offset + 1 + lineNum);
   }
 

src/debug.js

@@ -0,0 +1,28 @@
+let messages = [];
+let level = 0;
+
+const debug = (msg, min) => {
+  if (level >= min) {
+    messages.push(msg);
+  }
+};
+
+debug.WARN = 1;
+debug.INFO = 2;
+debug.DEBUG = 3;
+
+debug.reset = () => {
+  messages = [];
+};
+
+debug.setDebugLevel = (v) => {
+  level = v;
+};
+
+debug.warn = (msg) => debug(msg, debug.WARN);
+debug.info = (msg) => debug(msg, debug.INFO);
+debug.debug = (msg) => debug(msg, debug.DEBUG);
+
+debug.debugMessages = () => messages;
+
+module.exports = debug;

src/layout-manager.js

@@ -1,3 +1,4 @@
+const { warn, debug } = require('./debug');
 const Cell = require('./cell');
 const { ColSpanCell, RowSpanCell } = Cell;
 
@@ -126,6 +127,7 @@ const { ColSpanCell, RowSpanCell } = Cell;
   function fillInTable(table) {
     let h_max = maxHeight(table);
     let w_max = maxWidth(table);
+    debug(`Max rows: ${h_max}; Max cols: ${w_max}`);
     for (let y = 0; y < h_max; y++) {
       for (let x = 0; x < w_max; x++) {
         if (!conflictExists(table, x, y)) {
@@ -140,10 +142,10 @@ const { ColSpanCell, RowSpanCell } = Cell;
             opts.rowSpan++;
             y2++;
           }
-
           let cell = new Cell(opts);
           cell.x = opts.x;
           cell.y = opts.y;
+          warn(`Missing cell at ${cell.y}-${cell.x}.`);
           insertCell(cell, table[y]);
         }
       }

src/table.js

@@ -1,11 +1,38 @@
+const debug = require('./debug');
 const utils = require('./utils');
 const tableLayout = require('./layout-manager');
 
 class Table extends Array {
-  constructor(options) {
+  constructor(opts) {
     super();
 
-    this.options = utils.mergeOptions(options);
+    const options = utils.mergeOptions(opts);
+    Object.defineProperty(this, 'options', {
+      value: options,
+      enumerable: options.debug,
+    });
+
+    if (options.debug) {
+      switch (typeof options.debug) {
+        case 'boolean':
+          debug.setDebugLevel(debug.WARN);
+          break;
+        case 'number':
+          debug.setDebugLevel(options.debug);
+          break;
+        case 'string':
+          debug.setDebugLevel(parseInt(options.debug, 10));
+          break;
+        default:
+          debug.setDebugLevel(debug.WARN);
+          debug.warn(`Debug option is expected to be boolean, number, or string. Received a ${typeof options.debug}`);
+      }
+      Object.defineProperty(this, 'messages', {
+        get() {
+          return debug.debugMessages();
+        },
+      });
+    }
   }
 
   toString() {
@@ -65,6 +92,8 @@ class Table extends Array {
   }
 }
 
+Table.reset = () => debug.reset();
+
 function doDraw(row, lineNum, result) {
   let line = [];
   row.forEach(function (cell) {

test/table-test.js

@@ -129,6 +129,41 @@ describe('@api Table ', function () {
     ];
     expect(table.toString()).toEqual(expected.join('\n'));
   });
+  describe('debugging', () => {
+    afterEach(() => Table.reset());
+    it('is not accessible when disabled', () => {
+      let table = new Table();
+      expect(table.messages).toBeUndefined();
+    });
+    it('warns of missing cells', () => {
+      let table = new Table({ debug: true });
+      table.push([{ rowSpan: 2 }], [{}]);
+      table.toString();
+      expect(table.messages).toEqual(['Missing cell at 0-1.']);
+    });
+    it('provides cell info', () => {
+      let table = new Table({ debug: 2 });
+      table.push(['a', 'b', { content: 'c', rowSpan: 2 }], [{ content: 'd', colSpan: 2 }]);
+      table.toString();
+      expect(table.messages).toContain('0-0: 1x1 Cell a');
+      expect(table.messages).toContain('0-1: 1x1 Cell b');
+      expect(table.messages).toContain('0-2: 2x1 Cell c');
+      expect(table.messages).toContain('1-0: 1x2 Cell d');
+    });
+    it('provides rowSpan and colSpan cell debug info', () => {
+      let table = new Table({ debug: 3 });
+      table.push(['a', 'b', { content: 'c', rowSpan: 2 }], [{ content: 'd', colSpan: 2 }]);
+      table.toString();
+      expect(table.messages).toContain('1-1: 1x1 ColSpanCell');
+      expect(table.messages).toContain('1-2: 1x1 RowSpanCell for c');
+    });
+    it('provides debug info', () => {
+      let table = new Table({ debug: 3 });
+      table.push([{}, {}], [{}, {}]);
+      table.toString();
+      expect(table.messages).toContain('Max rows: 2; Max cols: 2');
+    });
+  });
 });
 
 /*