codewear-study · PParkJy · Jan 16, 2020 · Jan 16, 2020 · Parkhyunseo · Jan 17, 2020
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -0,0 +1,34 @@
+{
+  "name": "react_calculator",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.4.0",
+    "@testing-library/user-event": "^7.2.1",
+    "react": "^16.12.0",
+    "react-dom": "^16.12.0",
+    "react-scripts": "3.3.0"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}
diff --git a/public/favicon.ico b/public/favicon.ico
diff --git a/public/index.html b/public/index.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>
diff --git a/public/logo192.png b/public/logo192.png
diff --git a/public/logo512.png b/public/logo512.png
diff --git a/public/manifest.json b/public/manifest.json
@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}
diff --git a/public/robots.txt b/public/robots.txt
@@ -0,0 +1,2 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
diff --git a/src/function/calculate.js b/src/function/calculate.js
@@ -0,0 +1,39 @@
+import clearAll from './clearAll'
+import inputNumber from './inputNumber'
+import decimalPoint from './decimalPoint'
+import inputResult from './inputResult'
+import inputContinuity from './inputContinuity'
+
+function calculate(state, button) {
+    if (button === "C") {
+      return clearAll()
+    }
+
+    if ("0123456789".indexOf(button) !== -1) {
+      return inputNumber(state,button)
+    }
+
+    if (button === ".") {
+      return decimalPoint(state.nextValue)
+    }
+
+    if (button === "=") {
+      return inputResult(state)
+    }
+
+    if (state.operatorValue) {
+      return inputContinuity(state,button)
+    }
+
+    if (!state.nextValue) {
+      return { operatorValue: button };
+    }
+
+    return {
+      displayValue: state.nextValue,
+      nextValue: null,
+      operatorValue: button,
+    };
+  }
+
+  export default calculate;
diff --git a/src/function/clearAll.js b/src/function/clearAll.js
@@ -0,0 +1,9 @@
+function clearAll(){
+    return {
+        displayValue: "0", 
+        nextValue: null,
+        operatorValue: null,
+    };    
+}
+
+export default clearAll
diff --git a/src/function/decimalPoint.js b/src/function/decimalPoint.js
@@ -0,0 +1,11 @@
+function decimalPoint(next){
+    if (next) { 
+        if (next.includes(".")) {
+            return {};
+        }
+    return { nextValue: next + "." };
+  }
+  return { nextValue: "0." };
+}
+
+export default decimalPoint
diff --git a/src/function/doOperation.js b/src/function/doOperation.js
@@ -0,0 +1,25 @@
+function doOperation(state) {
+    const operator = state.operatorValue
+    const preOperand = parseFloat(state.displayValue || "0")
+    const backOperand = parseFloat(state.nextValue || (operator === "/" || operator === '*' ? "1": "0"))
+    if (operator === "+") {
+      return (preOperand+backOperand).toString();
+    }
+    if (operator === "-") {
+      return (preOperand-backOperand).toString();
+    }
+    if (operator === "*") {
+      return (preOperand*backOperand).toString();
+    }
+    if (operator === "/") {
+      if (backOperand == "0") {
+        return "NaN"; 
+      } 
+      if (backOperand != "0"){
+        return (preOperand/backOperand).toString();
+      }
+  }   
+    console.log('error');
+  }
+
+  export default doOperation;
diff --git a/src/function/inputContinuity.js b/src/function/inputContinuity.js
@@ -0,0 +1,10 @@
+import doOperation from './doOperation'
+
+function inputContinuity(state,button){
+    return {
+        displayValue: doOperation(state),
+        nextValue: null,
+        operatorValue: button,
+    };
+}
+  export default inputContinuity
diff --git a/src/function/inputNumber.js b/src/function/inputNumber.js
@@ -0,0 +1,30 @@
+function inputNumber(state,button){
+    const next = state.nextValue
+    const operator = state.operatorValue
+
+    if (button === "0" && next === "0") {
+        return {};
+      }
+
+      if (operator) {
+        if (next) {
+          return { nextValue: next + button };
+        }
+        return { nextValue: button };
+      } 
+
+      if (next) {
+        const nextValue = next === "0" ? button : next + button;
+        return {
+	      nextValue: nextValue,
+          displayValue: null, 
+        };
+      }
+      return {
+        nextValue: button,
+        displayValue: null,
+      };
+}
+
+
+export default inputNumber
diff --git a/src/function/inputResult.js b/src/function/inputResult.js
@@ -0,0 +1,13 @@
+import doOperation from './doOperation'
+
+function inputResult(state){
+    if (state.nextValue && state.operatorValue) {
+        return {
+          displayValue: doOperation(state),
+          nextValue: null,
+          operatorValue: null,
+        };
+      } 
+}
+
+export default inputResult
diff --git a/src/index.js b/src/index.js
@@ -0,0 +1,5 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import Calculator from './layout/reactCalculator';
+
+ReactDOM.render(<Calculator />, document.getElementById('root'));
diff --git a/src/layout/buttonLayout.js b/src/layout/buttonLayout.js
@@ -0,0 +1,37 @@
+import React, {Component, Fragment } from 'react';
+
+class buttonLayout extends Component{
+    render(){
+        return(
+            <Fragment>
+                    <button name="C" onClick={event => this.props.click(event.target.name)}>C</button>
+                <div>
+                    <button name="7" onClick={event => this.props.click(event.target.name)}>7</button>
+                    <button name="8" onClick={event => this.props.click(event.target.name)}>8</button>
+                    <button name="9" onClick={event => this.props.click(event.target.name)}>9</button>
+                    <button name="/" onClick={event => this.props.click(event.target.name)}>/</button>
+                </div>
+                <div>
+                    <button name="4" onClick={event => this.props.click(event.target.name)}>4</button>
+                    <button name="5" onClick={event => this.props.click(event.target.name)}>5</button>
+                    <button name="6" onClick={event => this.props.click(event.target.name)}>6</button>
+                    <button name="*" onClick={event => this.props.click(event.target.name)}>*</button>
+                </div>
+                <div>
+                    <button name="1" onClick={event => this.props.click(event.target.name)}>1</button>
+                    <button name="2" onClick={event => this.props.click(event.target.name)}>2</button>
+                    <button name="3" onClick={event => this.props.click(event.target.name)}>3</button>
+                    <button name="-" onClick={event => this.props.click(event.target.name)}>-</button>
+                </div>
+                <div>
+                    <button name="0" onClick={event => this.props.click(event.target.name)}>0</button>
+                    <button name="." onClick={event => this.props.click(event.target.name)}>.</button>
+                    <button name="=" onClick={event => this.props.click(event.target.name)}>=</button>
+                    <button name="+" onClick={event => this.props.click(event.target.name)}>+</button>
+                </div>
+            </Fragment>
+        )
+    }
+}
+
+export default buttonLayout;
diff --git a/src/layout/displayLayout.js b/src/layout/displayLayout.js
@@ -0,0 +1,12 @@
+import React, {Component } from 'react';
+
+class displayLayout extends Component{
+    render(){
+        const displayStyle = {textAlign:"right"}
+        return(
+            <input type="text" readOnly style={displayStyle} value={this.props.value}></input>
+        )
+    }
+}
+
+export default displayLayout;
diff --git a/src/layout/reactCalculator.js b/src/layout/reactCalculator.js
@@ -0,0 +1,56 @@
+import React, {Component } from 'react';
+import calculate from "../function/calculate"
+import DisplayLayout from "./displayLayout"
+import ButtonLayout from "./buttonLayout"
+
+class reactCalculator extends Component{
+    constructor(){
+        super() 
+        this.state = {
+            nextValue: null,
+            operatorValue: null,
+            displayValue: null
+        }
+    }
+
+    buttonClick = (buttonName) => {
+        this.setState(calculate(this.state, buttonName))
+    }
+
+    inputKeyboard = (event) => {
+      let {key} = event
+      const operations = ['/','*','+','-','.','=']
+
+      if (key === 'Enter')
+        key = '='
+
+      if ((/\d/).test(key)) {
+        event.preventDefault()
+        this.buttonClick(key)
+      } 
+      if (operations.indexOf(key)!= -1) {
+        event.preventDefault()
+        this.buttonClick(key)
+      }
+    };  
+
+    componentDidMount() {
+      document.addEventListener('keydown', this.inputKeyboard)
+    }
+
+    componentWillUnmount() {
+    document.removeEventListener('keydown', this.inputKeyboard)
+    }
+
+    render(){
+        return(
+            <div>
+                <DisplayLayout value = {this.state.nextValue || this.state.displayValue}></DisplayLayout>
+                <ButtonLayout click = {this.buttonClick}></ButtonLayout>
+            </div>
+        )
+    }
+}
+
+export default reactCalculator;
+
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		# https://www.robotstxt.org/robotstxt.html
		User-agent: *