_php_cast_int helper for casting values to int using PHP rules

kukawski · kukawski · commit bcb4c0ae7baf · 2018-03-24T13:57:33.000+01:00
diff --git a/src/php/_helpers/_php_cast_int.js b/src/php/_helpers/_php_cast_int.js
@@ -0,0 +1,52 @@
+module.exports = function _php_cast_int (value) { // eslint-disable-line camelcase
+  // original by: Rafał Kukawski
+  //   example 1: _php_cast_int(false)
+  //   returns 1: 0
+  //   example 2: _php_cast_int(true)
+  //   returns 2: 1
+  //   example 3: _php_cast_int(0)
+  //   returns 3: 0
+  //   example 4: _php_cast_int(1)
+  //   returns 4: 1
+  //   example 5: _php_cast_int(3.14)
+  //   returns 5: 3
+  //   example 6: _php_cast_int('')
+  //   returns 6: 0
+  //   example 7: _php_cast_int('0')
+  //   returns 7: 0
+  //   example 8: _php_cast_int('abc')
+  //   returns 8: 0
+  //   example 9: _php_cast_int(null)
+  //   returns 9: 0
+  //  example 10: _php_cast_int(undefined)
+  //  returns 10: 0
+  //  example 11: _php_cast_int('123abc')
+  //  returns 11: 123
+  //  example 12: _php_cast_int('123e4')
+  //  returns 12: 123
+  //  example 13: _php_cast_int(0x200000001)
+  //  returns 13: 8589934593
+
+  var type = typeof value
+
+  switch (type) {
+    case 'number':
+      if (isNaN(value) || !isFinite(value)) {
+        // from PHP 7, NaN and Infinity are casted to 0
+        return 0
+      }
+
+      return value < 0 ? Math.ceil(value) : Math.floor(value)
+    case 'string':
+      return parseInt(value, 10) || 0
+    case 'boolean':
+      // fall through
+    default:
+      // Behaviour for types other than float, string, boolean
+      // is undefined and can change any time.
+      // To not invent complex logic
+      // that mimics PHP 7.0 behaviour
+      // casting value->bool->number is used
+      return +!!value
+  }
+}
diff --git a/src/php/_helpers/index.js b/src/php/_helpers/index.js
@@ -1,2 +1,3 @@
 module.exports['_bc'] = require('./_bc')
 module.exports['_phpCastString'] = require('./_phpCastString')
+module.exports['_php_cast_int'] = require('./_php_cast_int')
diff --git a/test/languages/php/_helpers/test-_php_cast_int.js b/test/languages/php/_helpers/test-_php_cast_int.js
@@ -0,0 +1,88 @@
+// warning: This file is auto generated by `npm run build:tests`
+// Do not edit by hand!
+process.env.TZ = 'UTC'
+var expect = require('chai').expect
+var ini_set = require('../../../../src/php/info/ini_set') // eslint-disable-line no-unused-vars,camelcase
+var ini_get = require('../../../../src/php/info/ini_get') // eslint-disable-line no-unused-vars,camelcase
+var _php_cast_int = require('../../../../src/php/_helpers/_php_cast_int.js') // eslint-disable-line no-unused-vars,camelcase
+
+describe('src/php/_helpers/_php_cast_int.js (tested in test/languages/php/_helpers/test-_php_cast_int.js)', function () {
+  it('should pass example 1', function (done) {
+    var expected = 0
+    var result = _php_cast_int(false)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 2', function (done) {
+    var expected = 1
+    var result = _php_cast_int(true)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 3', function (done) {
+    var expected = 0
+    var result = _php_cast_int(0)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 4', function (done) {
+    var expected = 1
+    var result = _php_cast_int(1)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 5', function (done) {
+    var expected = 3
+    var result = _php_cast_int(3.14)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 6', function (done) {
+    var expected = 0
+    var result = _php_cast_int('')
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 7', function (done) {
+    var expected = 0
+    var result = _php_cast_int('0')
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 8', function (done) {
+    var expected = 0
+    var result = _php_cast_int('abc')
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 9', function (done) {
+    var expected = 0
+    var result = _php_cast_int(null)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 10', function (done) {
+    var expected = 0
+    var result = _php_cast_int(undefined)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 11', function (done) {
+    var expected = 123
+    var result = _php_cast_int('123abc')
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 12', function (done) {
+    var expected = 123
+    var result = _php_cast_int('123e4')
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+  it('should pass example 13', function (done) {
+    var expected = 8589934593
+    var result = _php_cast_int(0x200000001)
+    expect(result).to.deep.equal(expected)
+    done()
+  })
+})

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,3 @@`
`1`	`1`	`module.exports['_bc'] = require('./_bc')`
`2`	`2`	`module.exports['_phpCastString'] = require('./_phpCastString')`
	`3`	`+module.exports['_php_cast_int'] = require('./_php_cast_int')`