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e77a9b7e81
Number() is a bit less forgiving than parseFloat() and is more likely to generate NaN rather than some random number. An audit of each case shows nowhere that parseFloat()’s features are needed.
385 lines
13 KiB
JavaScript
385 lines
13 KiB
JavaScript
/**
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* @license
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* Visual Blocks Language
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*
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* Copyright 2015 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Generating PHP for math blocks.
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* @author daarond@gmail.com (Daaron Dwyer)
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*/
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'use strict';
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goog.provide('Blockly.PHP.math');
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goog.require('Blockly.PHP');
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Blockly.PHP['math_number'] = function(block) {
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// Numeric value.
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var code = Number(block.getFieldValue('NUM'));
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var order = code >= 0 ? Blockly.PHP.ORDER_ATOMIC :
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Blockly.PHP.ORDER_UNARY_NEGATION;
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if (code == Infinity) {
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code = 'INF';
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} else if (code == -Infinity) {
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code = '-INF';
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}
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return [code, order];
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};
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Blockly.PHP['math_arithmetic'] = function(block) {
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// Basic arithmetic operators, and power.
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var OPERATORS = {
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'ADD': [' + ', Blockly.PHP.ORDER_ADDITION],
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'MINUS': [' - ', Blockly.PHP.ORDER_SUBTRACTION],
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'MULTIPLY': [' * ', Blockly.PHP.ORDER_MULTIPLICATION],
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'DIVIDE': [' / ', Blockly.PHP.ORDER_DIVISION],
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'POWER': [' ** ', Blockly.PHP.ORDER_POWER]
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};
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var tuple = OPERATORS[block.getFieldValue('OP')];
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var operator = tuple[0];
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var order = tuple[1];
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var argument0 = Blockly.PHP.valueToCode(block, 'A', order) || '0';
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var argument1 = Blockly.PHP.valueToCode(block, 'B', order) || '0';
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var code = argument0 + operator + argument1;
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return [code, order];
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};
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Blockly.PHP['math_single'] = function(block) {
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// Math operators with single operand.
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var operator = block.getFieldValue('OP');
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var code;
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var arg;
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if (operator == 'NEG') {
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// Negation is a special case given its different operator precedence.
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arg = Blockly.PHP.valueToCode(block, 'NUM',
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Blockly.PHP.ORDER_UNARY_NEGATION) || '0';
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if (arg[0] == '-') {
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// --3 is not legal in JS.
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arg = ' ' + arg;
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}
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code = '-' + arg;
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return [code, Blockly.PHP.ORDER_UNARY_NEGATION];
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}
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if (operator == 'SIN' || operator == 'COS' || operator == 'TAN') {
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arg = Blockly.PHP.valueToCode(block, 'NUM',
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Blockly.PHP.ORDER_DIVISION) || '0';
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} else {
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arg = Blockly.PHP.valueToCode(block, 'NUM',
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Blockly.PHP.ORDER_NONE) || '0';
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}
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// First, handle cases which generate values that don't need parentheses
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// wrapping the code.
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switch (operator) {
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case 'ABS':
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code = 'abs(' + arg + ')';
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break;
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case 'ROOT':
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code = 'sqrt(' + arg + ')';
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break;
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case 'LN':
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code = 'log(' + arg + ')';
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break;
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case 'EXP':
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code = 'exp(' + arg + ')';
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break;
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case 'POW10':
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code = 'pow(10,' + arg + ')';
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break;
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case 'ROUND':
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code = 'round(' + arg + ')';
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break;
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case 'ROUNDUP':
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code = 'ceil(' + arg + ')';
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break;
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case 'ROUNDDOWN':
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code = 'floor(' + arg + ')';
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break;
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case 'SIN':
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code = 'sin(' + arg + ' / 180 * pi())';
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break;
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case 'COS':
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code = 'cos(' + arg + ' / 180 * pi())';
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break;
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case 'TAN':
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code = 'tan(' + arg + ' / 180 * pi())';
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break;
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}
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if (code) {
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return [code, Blockly.PHP.ORDER_FUNCTION_CALL];
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}
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// Second, handle cases which generate values that may need parentheses
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// wrapping the code.
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switch (operator) {
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case 'LOG10':
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code = 'log(' + arg + ') / log(10)';
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break;
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case 'ASIN':
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code = 'asin(' + arg + ') / pi() * 180';
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break;
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case 'ACOS':
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code = 'acos(' + arg + ') / pi() * 180';
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break;
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case 'ATAN':
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code = 'atan(' + arg + ') / pi() * 180';
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break;
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default:
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throw Error('Unknown math operator: ' + operator);
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}
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return [code, Blockly.PHP.ORDER_DIVISION];
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};
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Blockly.PHP['math_constant'] = function(block) {
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// Constants: PI, E, the Golden Ratio, sqrt(2), 1/sqrt(2), INFINITY.
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var CONSTANTS = {
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'PI': ['M_PI', Blockly.PHP.ORDER_ATOMIC],
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'E': ['M_E', Blockly.PHP.ORDER_ATOMIC],
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'GOLDEN_RATIO': ['(1 + sqrt(5)) / 2', Blockly.PHP.ORDER_DIVISION],
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'SQRT2': ['M_SQRT2', Blockly.PHP.ORDER_ATOMIC],
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'SQRT1_2': ['M_SQRT1_2', Blockly.PHP.ORDER_ATOMIC],
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'INFINITY': ['INF', Blockly.PHP.ORDER_ATOMIC]
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};
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return CONSTANTS[block.getFieldValue('CONSTANT')];
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};
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Blockly.PHP['math_number_property'] = function(block) {
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// Check if a number is even, odd, prime, whole, positive, or negative
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// or if it is divisible by certain number. Returns true or false.
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var number_to_check = Blockly.PHP.valueToCode(block, 'NUMBER_TO_CHECK',
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Blockly.PHP.ORDER_MODULUS) || '0';
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var dropdown_property = block.getFieldValue('PROPERTY');
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var code;
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if (dropdown_property == 'PRIME') {
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// Prime is a special case as it is not a one-liner test.
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var functionName = Blockly.PHP.provideFunction_(
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'math_isPrime',
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['function ' + Blockly.PHP.FUNCTION_NAME_PLACEHOLDER_ + '($n) {',
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' // https://en.wikipedia.org/wiki/Primality_test#Naive_methods',
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' if ($n == 2 || $n == 3) {',
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' return true;',
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' }',
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' // False if n is NaN, negative, is 1, or not whole.',
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' // And false if n is divisible by 2 or 3.',
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' if (!is_numeric($n) || $n <= 1 || $n % 1 != 0 || $n % 2 == 0 ||' +
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' $n % 3 == 0) {',
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' return false;',
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' }',
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' // Check all the numbers of form 6k +/- 1, up to sqrt(n).',
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' for ($x = 6; $x <= sqrt($n) + 1; $x += 6) {',
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' if ($n % ($x - 1) == 0 || $n % ($x + 1) == 0) {',
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' return false;',
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' }',
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' }',
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' return true;',
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'}']);
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code = functionName + '(' + number_to_check + ')';
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return [code, Blockly.PHP.ORDER_FUNCTION_CALL];
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}
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switch (dropdown_property) {
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case 'EVEN':
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code = number_to_check + ' % 2 == 0';
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break;
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case 'ODD':
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code = number_to_check + ' % 2 == 1';
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break;
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case 'WHOLE':
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code = 'is_int(' + number_to_check + ')';
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break;
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case 'POSITIVE':
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code = number_to_check + ' > 0';
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break;
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case 'NEGATIVE':
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code = number_to_check + ' < 0';
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break;
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case 'DIVISIBLE_BY':
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var divisor = Blockly.PHP.valueToCode(block, 'DIVISOR',
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Blockly.PHP.ORDER_MODULUS) || '0';
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code = number_to_check + ' % ' + divisor + ' == 0';
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break;
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}
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return [code, Blockly.PHP.ORDER_EQUALITY];
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};
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Blockly.PHP['math_change'] = function(block) {
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// Add to a variable in place.
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var argument0 = Blockly.PHP.valueToCode(block, 'DELTA',
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Blockly.PHP.ORDER_ADDITION) || '0';
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var varName = Blockly.PHP.variableDB_.getName(
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block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
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return varName + ' += ' + argument0 + ';\n';
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};
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// Rounding functions have a single operand.
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Blockly.PHP['math_round'] = Blockly.PHP['math_single'];
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// Trigonometry functions have a single operand.
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Blockly.PHP['math_trig'] = Blockly.PHP['math_single'];
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Blockly.PHP['math_on_list'] = function(block) {
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// Math functions for lists.
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var func = block.getFieldValue('OP');
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var list, code;
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switch (func) {
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case 'SUM':
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_FUNCTION_CALL) || 'array()';
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code = 'array_sum(' + list + ')';
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break;
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case 'MIN':
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_FUNCTION_CALL) || 'array()';
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code = 'min(' + list + ')';
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break;
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case 'MAX':
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_FUNCTION_CALL) || 'array()';
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code = 'max(' + list + ')';
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break;
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case 'AVERAGE':
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var functionName = Blockly.PHP.provideFunction_(
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'math_mean',
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['function ' + Blockly.PHP.FUNCTION_NAME_PLACEHOLDER_ +
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'($myList) {',
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' return array_sum($myList) / count($myList);',
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'}']);
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_NONE) || 'array()';
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code = functionName + '(' + list + ')';
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break;
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case 'MEDIAN':
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var functionName = Blockly.PHP.provideFunction_(
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'math_median',
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['function ' + Blockly.PHP.FUNCTION_NAME_PLACEHOLDER_ +
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'($arr) {',
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' sort($arr,SORT_NUMERIC);',
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' return (count($arr) % 2) ? $arr[floor(count($arr)/2)] : ',
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' ($arr[floor(count($arr)/2)] + $arr[floor(count($arr)/2)' +
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' - 1]) / 2;',
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'}']);
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_NONE) || '[]';
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code = functionName + '(' + list + ')';
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break;
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case 'MODE':
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// As a list of numbers can contain more than one mode,
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// the returned result is provided as an array.
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// Mode of [3, 'x', 'x', 1, 1, 2, '3'] -> ['x', 1].
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var functionName = Blockly.PHP.provideFunction_(
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'math_modes',
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['function ' + Blockly.PHP.FUNCTION_NAME_PLACEHOLDER_ +
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'($values) {',
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' if (empty($values)) return array();',
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' $counts = array_count_values($values);',
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' arsort($counts); // Sort counts in descending order',
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' $modes = array_keys($counts, current($counts), true);',
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' return $modes;',
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'}']);
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_NONE) || '[]';
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code = functionName + '(' + list + ')';
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break;
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case 'STD_DEV':
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var functionName = Blockly.PHP.provideFunction_(
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'math_standard_deviation',
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['function ' + Blockly.PHP.FUNCTION_NAME_PLACEHOLDER_ +
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'($numbers) {',
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' $n = count($numbers);',
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' if (!$n) return null;',
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' $mean = array_sum($numbers) / count($numbers);',
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' foreach($numbers as $key => $num) $devs[$key] = ' +
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'pow($num - $mean, 2);',
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' return sqrt(array_sum($devs) / (count($devs) - 1));',
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'}']);
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_NONE) || '[]';
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code = functionName + '(' + list + ')';
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break;
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case 'RANDOM':
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var functionName = Blockly.PHP.provideFunction_(
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'math_random_list',
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['function ' + Blockly.PHP.FUNCTION_NAME_PLACEHOLDER_ +
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'($list) {',
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' $x = rand(0, count($list)-1);',
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' return $list[$x];',
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'}']);
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list = Blockly.PHP.valueToCode(block, 'LIST',
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Blockly.PHP.ORDER_NONE) || '[]';
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code = functionName + '(' + list + ')';
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break;
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default:
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throw Error('Unknown operator: ' + func);
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}
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return [code, Blockly.PHP.ORDER_FUNCTION_CALL];
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};
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Blockly.PHP['math_modulo'] = function(block) {
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// Remainder computation.
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var argument0 = Blockly.PHP.valueToCode(block, 'DIVIDEND',
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Blockly.PHP.ORDER_MODULUS) || '0';
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var argument1 = Blockly.PHP.valueToCode(block, 'DIVISOR',
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Blockly.PHP.ORDER_MODULUS) || '0';
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var code = argument0 + ' % ' + argument1;
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return [code, Blockly.PHP.ORDER_MODULUS];
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};
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Blockly.PHP['math_constrain'] = function(block) {
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// Constrain a number between two limits.
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var argument0 = Blockly.PHP.valueToCode(block, 'VALUE',
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Blockly.PHP.ORDER_COMMA) || '0';
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var argument1 = Blockly.PHP.valueToCode(block, 'LOW',
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Blockly.PHP.ORDER_COMMA) || '0';
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var argument2 = Blockly.PHP.valueToCode(block, 'HIGH',
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Blockly.PHP.ORDER_COMMA) || 'Infinity';
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var code = 'min(max(' + argument0 + ', ' + argument1 + '), ' +
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argument2 + ')';
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return [code, Blockly.PHP.ORDER_FUNCTION_CALL];
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};
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Blockly.PHP['math_random_int'] = function(block) {
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// Random integer between [X] and [Y].
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var argument0 = Blockly.PHP.valueToCode(block, 'FROM',
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Blockly.PHP.ORDER_COMMA) || '0';
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var argument1 = Blockly.PHP.valueToCode(block, 'TO',
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Blockly.PHP.ORDER_COMMA) || '0';
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var functionName = Blockly.PHP.provideFunction_(
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'math_random_int',
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['function ' + Blockly.PHP.FUNCTION_NAME_PLACEHOLDER_ +
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'($a, $b) {',
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' if ($a > $b) {',
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' return rand($b, $a);',
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' }',
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' return rand($a, $b);',
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'}']);
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var code = functionName + '(' + argument0 + ', ' + argument1 + ')';
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return [code, Blockly.PHP.ORDER_FUNCTION_CALL];
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};
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Blockly.PHP['math_random_float'] = function(block) {
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// Random fraction between 0 and 1.
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return ['(float)rand()/(float)getrandmax()', Blockly.PHP.ORDER_FUNCTION_CALL];
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};
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Blockly.PHP['math_atan2'] = function(block) {
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// Arctangent of point (X, Y) in degrees from -180 to 180.
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var argument0 = Blockly.PHP.valueToCode(block, 'X',
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Blockly.PHP.ORDER_COMMA) || '0';
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var argument1 = Blockly.PHP.valueToCode(block, 'Y',
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Blockly.PHP.ORDER_COMMA) || '0';
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return ['atan2(' + argument1 + ', ' + argument0 + ') / pi() * 180',
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Blockly.PHP.ORDER_DIVISION];
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};
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