add(pptxjs): support XLSX file preview

Author: PIKACHUIM

exceljs/.babelrc

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+{
+  "presets": [
+    "@babel/preset-env"
+  ]
+}

exceljs/.browserslistrc

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+> 0.25%
+not dead

exceljs/.eslintignore

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+build
+dist
+out
+spec/manual/public/

exceljs/.eslintrc

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+{
+  "parserOptions": {
+    "sourceType": "script"
+  },
+  "extends": [
+    "airbnb-base",
+    "prettier",
+    "plugin:node/recommended"
+  ],
+  "env": {
+    "es6": true,
+    "mocha": true,
+    "node": true
+  },
+  "rules": {
+    "arrow-parens": ["error", "as-needed"],
+    "class-methods-use-this": ["off"],
+    "comma-dangle": ["error", {"arrays": "always-multiline", "objects": "always-multiline", "imports": "always-multiline", "exports": "always-multiline", "functions": "never"}],
+    "default-case": ["off"],
+    "func-names": ["off", "never"],
+    "global-require": ["off"],
+    "max-len": ["error", {"code": 120, "ignoreComments": true, "ignoreStrings": true}],
+    "no-console": ["error", { "allow": ["warn"] }],
+    "no-continue": ["off"],
+    "no-mixed-operators": ["error", {"allowSamePrecedence": true}],
+    "no-multi-assign": ["off"],
+    "no-param-reassign": ["off"],
+    "no-path-concat": ["off"],
+    "no-plusplus": ["off"],
+    "no-prototype-builtins": ["off"],
+    "no-restricted-syntax": ["error", "ForInStatement", "LabeledStatement", "WithStatement"],
+    "no-return-assign": ["off"],
+    "no-trailing-spaces": ["error", { "skipBlankLines": true }],
+    "no-underscore-dangle": ["off", { "allowAfterThis": true, "allowAfterSuper": true }],
+    "no-unused-vars": ["error", {"vars": "all", "args": "none", "ignoreRestSiblings": true}],
+    "no-use-before-define": ["error", { "variables": false, "classes": false, "functions": false }],
+    "node/no-unsupported-features/es-syntax": ["error", {"version": ">=10.0.0","ignores": []}],
+    "node/process-exit-as-throw": ["off"],
+    "object-curly-spacing": ["error", "never"],
+    "object-property-newline": ["off", { "allowMultiplePropertiesPerLine": true }],
+    "prefer-destructuring": ["warn", {"array": false, "object": true}],
+    "prefer-object-spread": ["off"],
+    "prefer-rest-params": ["off"],
+    "quotes": ["error", "single"],
+    "semi": ["error", "always"],
+    "space-before-function-paren": ["error", {"anonymous": "never", "named": "never", "asyncArrow": "always"}],
+    "strict": ["off"]
+  }
+}

exceljs/.gitignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Generated files
+dist/*
+build/*
+
+# Test Output Folder
+out/*
+spec/out/*
+
+# Tmp folder
+tmp/*
+
+# WebStorm
+.idea
+
+# VS Code
+.vscode
+
+# Intellij IDEA
+exceljs.iml
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git-
+node_modules
+
+# gold internals
+spec/integration/data/gold
+
+# bundle files
+/spec/manual/public/exceljs.js
+/spec/manual/public/exceljs.min.js
+
+package-lock.json
+
+# optional switch off tests
+.disable-test-*
+
+# jasmine
+_SpecRunner.html
+
+# Mac files
+.DS_Store
+
+# Ignore xlsx files generated during testing
+*.xlsx
+enpm-lock.yaml

exceljs/.npmrc

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+package-lock=false

exceljs/.prettier

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+{
+  "bracketSpacing": false,
+  "printWidth": 100,
+  "trailingComma": "all",
+  "bracketSpacing": false,
+  "arrowParens": "avoid"
+}

exceljs/.prettierignore

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+build
+dist
+out
+spec/manual/public/

exceljs/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014-2019 Guyon Roche
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

exceljs/MODEL.md

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+# Workbook Model
+
+The workbook and its components define a simple JavaScript Object model which can be accessed and manipulated if desired.
+
+## Workbook Model
+
+```javascript
+{
+    worksheets: [
+        // array of worksheet models
+    ]
+}
+```
+
+## Worksheet Model
+
+```javascript
+{
+    // worksheet id (integer>=1)
+    id: 1,
+
+    // worksheet name
+    name: "blort",
+
+    // rows
+    rows: [
+        // array of row models
+    ],
+
+    // merge ranges
+    "merges": [
+        "A2:B3"
+    ],
+    "dimensions": {
+        "top": 1,
+        "left": 1,
+        "bottom": 3,
+        "right": 6
+    },
+
+    // setting for enable fit to page (default: false)
+    fitToPage: false,
+
+    // setting for page
+    pageSetup: {
+        paperSize: 9,
+        scale: 100,
+        firstPageNumber: 0,
+        fitToWidth: 1,
+        fitToHeight: 1,
+        pageOrder: "downThenOver",
+        orientation: "portrait", // (portrait | landscape)
+        usePrinterDefaults: "false",
+        blackAndWhite: "false",
+        draft: "false",
+        cellComments: "none",
+        useFirstPageNumber: "false",
+        horizontalDpi: 300,
+        verticalDpi: 300,
+        copies: 1
+    },
+
+    // setting for margins
+    pageMargins: {
+        left: 0.7,
+        right:0.7,
+        top: 0.75,
+        bottom: 0.75,
+        header: 0.3,
+        footer: 0.3
+    }
+}
+```
+
+## Row Model
+
+```javascript
+{
+    // row number
+    number: 1,
+    cells: [
+        // array of cell models
+    ],
+
+    // min column number
+    min: 1,
+
+    // maximum column number
+    max: 6
+}
+```
+
+## Cell Models
+
+### Null Cell Model
+
+```javascript
+{
+    address: "A1",
+    type: 0
+}
+```
+
+### Merge Cell Model
+
+```javascript
+{
+    address: "B1",
+    type: 1,
+    master: "A1"
+}
+```
+
+### Number Cell Model
+
+```javascript
+{
+    address: "B1",
+    type: 2,
+    value: 5
+}
+```
+
+### String Cell Model
+
+```javascript
+{
+    address: "B1",
+    type: 2,
+    value: "Hello, World!"
+}
+```
+
+### Date Cell Model
+
+```javascript
+{
+    address: "C1",
+    type: 3,
+    value: new Date()
+}
+```
+
+### Formula Cell Model
+
+```javascript
+{
+    address: "D1",
+    type: 4,
+    formula: "A1+A2",
+    result: 7
+}
+```
+
+### Hyperlink Cell Model
+
+```javascript
+{
+    "address": "F1",
+    "type": 5,
+    "text": "www.link.com",
+    "hyperlink": "http://www.link.com"
+}
+```