mirror of
https://github.com/google/blockly.git
synced 2026-01-04 23:50:12 +01:00
90b3f75d82
Our files are up to a decade old, and have churned so much, that the initial author of the file no longer has much meaning. Furthermore, this will encourage developers to post to the developer group, rather than emailing Googlers (usually me) directly.
409 lines
15 KiB
JavaScript
409 lines
15 KiB
JavaScript
/**
|
|
* @license
|
|
* Copyright 2012 Google LLC
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* @fileoverview Generating JavaScript for math blocks.
|
|
*/
|
|
'use strict';
|
|
|
|
goog.provide('Blockly.JavaScript.math');
|
|
|
|
goog.require('Blockly.JavaScript');
|
|
|
|
|
|
Blockly.JavaScript['math_number'] = function(block) {
|
|
// Numeric value.
|
|
var code = Number(block.getFieldValue('NUM'));
|
|
var order = code >= 0 ? Blockly.JavaScript.ORDER_ATOMIC :
|
|
Blockly.JavaScript.ORDER_UNARY_NEGATION;
|
|
return [code, order];
|
|
};
|
|
|
|
Blockly.JavaScript['math_arithmetic'] = function(block) {
|
|
// Basic arithmetic operators, and power.
|
|
var OPERATORS = {
|
|
'ADD': [' + ', Blockly.JavaScript.ORDER_ADDITION],
|
|
'MINUS': [' - ', Blockly.JavaScript.ORDER_SUBTRACTION],
|
|
'MULTIPLY': [' * ', Blockly.JavaScript.ORDER_MULTIPLICATION],
|
|
'DIVIDE': [' / ', Blockly.JavaScript.ORDER_DIVISION],
|
|
'POWER': [null, Blockly.JavaScript.ORDER_NONE] // Handle power separately.
|
|
};
|
|
var tuple = OPERATORS[block.getFieldValue('OP')];
|
|
var operator = tuple[0];
|
|
var order = tuple[1];
|
|
var argument0 = Blockly.JavaScript.valueToCode(block, 'A', order) || '0';
|
|
var argument1 = Blockly.JavaScript.valueToCode(block, 'B', order) || '0';
|
|
var code;
|
|
// Power in JavaScript requires a special case since it has no operator.
|
|
if (!operator) {
|
|
code = 'Math.pow(' + argument0 + ', ' + argument1 + ')';
|
|
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
|
|
}
|
|
code = argument0 + operator + argument1;
|
|
return [code, order];
|
|
};
|
|
|
|
Blockly.JavaScript['math_single'] = function(block) {
|
|
// Math operators with single operand.
|
|
var operator = block.getFieldValue('OP');
|
|
var code;
|
|
var arg;
|
|
if (operator === 'NEG') {
|
|
// Negation is a special case given its different operator precedence.
|
|
arg = Blockly.JavaScript.valueToCode(block, 'NUM',
|
|
Blockly.JavaScript.ORDER_UNARY_NEGATION) || '0';
|
|
if (arg[0] === '-') {
|
|
// --3 is not legal in JS.
|
|
arg = ' ' + arg;
|
|
}
|
|
code = '-' + arg;
|
|
return [code, Blockly.JavaScript.ORDER_UNARY_NEGATION];
|
|
}
|
|
if (operator === 'SIN' || operator === 'COS' || operator === 'TAN') {
|
|
arg = Blockly.JavaScript.valueToCode(block, 'NUM',
|
|
Blockly.JavaScript.ORDER_DIVISION) || '0';
|
|
} else {
|
|
arg = Blockly.JavaScript.valueToCode(block, 'NUM',
|
|
Blockly.JavaScript.ORDER_NONE) || '0';
|
|
}
|
|
// First, handle cases which generate values that don't need parentheses
|
|
// wrapping the code.
|
|
switch (operator) {
|
|
case 'ABS':
|
|
code = 'Math.abs(' + arg + ')';
|
|
break;
|
|
case 'ROOT':
|
|
code = 'Math.sqrt(' + arg + ')';
|
|
break;
|
|
case 'LN':
|
|
code = 'Math.log(' + arg + ')';
|
|
break;
|
|
case 'EXP':
|
|
code = 'Math.exp(' + arg + ')';
|
|
break;
|
|
case 'POW10':
|
|
code = 'Math.pow(10,' + arg + ')';
|
|
break;
|
|
case 'ROUND':
|
|
code = 'Math.round(' + arg + ')';
|
|
break;
|
|
case 'ROUNDUP':
|
|
code = 'Math.ceil(' + arg + ')';
|
|
break;
|
|
case 'ROUNDDOWN':
|
|
code = 'Math.floor(' + arg + ')';
|
|
break;
|
|
case 'SIN':
|
|
code = 'Math.sin(' + arg + ' / 180 * Math.PI)';
|
|
break;
|
|
case 'COS':
|
|
code = 'Math.cos(' + arg + ' / 180 * Math.PI)';
|
|
break;
|
|
case 'TAN':
|
|
code = 'Math.tan(' + arg + ' / 180 * Math.PI)';
|
|
break;
|
|
}
|
|
if (code) {
|
|
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
|
|
}
|
|
// Second, handle cases which generate values that may need parentheses
|
|
// wrapping the code.
|
|
switch (operator) {
|
|
case 'LOG10':
|
|
code = 'Math.log(' + arg + ') / Math.log(10)';
|
|
break;
|
|
case 'ASIN':
|
|
code = 'Math.asin(' + arg + ') / Math.PI * 180';
|
|
break;
|
|
case 'ACOS':
|
|
code = 'Math.acos(' + arg + ') / Math.PI * 180';
|
|
break;
|
|
case 'ATAN':
|
|
code = 'Math.atan(' + arg + ') / Math.PI * 180';
|
|
break;
|
|
default:
|
|
throw Error('Unknown math operator: ' + operator);
|
|
}
|
|
return [code, Blockly.JavaScript.ORDER_DIVISION];
|
|
};
|
|
|
|
Blockly.JavaScript['math_constant'] = function(block) {
|
|
// Constants: PI, E, the Golden Ratio, sqrt(2), 1/sqrt(2), INFINITY.
|
|
var CONSTANTS = {
|
|
'PI': ['Math.PI', Blockly.JavaScript.ORDER_MEMBER],
|
|
'E': ['Math.E', Blockly.JavaScript.ORDER_MEMBER],
|
|
'GOLDEN_RATIO':
|
|
['(1 + Math.sqrt(5)) / 2', Blockly.JavaScript.ORDER_DIVISION],
|
|
'SQRT2': ['Math.SQRT2', Blockly.JavaScript.ORDER_MEMBER],
|
|
'SQRT1_2': ['Math.SQRT1_2', Blockly.JavaScript.ORDER_MEMBER],
|
|
'INFINITY': ['Infinity', Blockly.JavaScript.ORDER_ATOMIC]
|
|
};
|
|
return CONSTANTS[block.getFieldValue('CONSTANT')];
|
|
};
|
|
|
|
Blockly.JavaScript['math_number_property'] = function(block) {
|
|
// Check if a number is even, odd, prime, whole, positive, or negative
|
|
// or if it is divisible by certain number. Returns true or false.
|
|
var number_to_check = Blockly.JavaScript.valueToCode(block, 'NUMBER_TO_CHECK',
|
|
Blockly.JavaScript.ORDER_MODULUS) || '0';
|
|
var dropdown_property = block.getFieldValue('PROPERTY');
|
|
var code;
|
|
if (dropdown_property === 'PRIME') {
|
|
// Prime is a special case as it is not a one-liner test.
|
|
var functionName = Blockly.JavaScript.provideFunction_(
|
|
'mathIsPrime',
|
|
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ + '(n) {',
|
|
' // https://en.wikipedia.org/wiki/Primality_test#Naive_methods',
|
|
' if (n === 2 || n === 3) {',
|
|
' return true;',
|
|
' }',
|
|
' // False if n is NaN, negative, is 1, or not whole.',
|
|
' // And false if n is divisible by 2 or 3.',
|
|
' if (isNaN(n) || n <= 1 || n % 1 !== 0 || n % 2 === 0 ||' +
|
|
' n % 3 === 0) {',
|
|
' return false;',
|
|
' }',
|
|
' // Check all the numbers of form 6k +/- 1, up to sqrt(n).',
|
|
' for (var x = 6; x <= Math.sqrt(n) + 1; x += 6) {',
|
|
' if (n % (x - 1) === 0 || n % (x + 1) === 0) {',
|
|
' return false;',
|
|
' }',
|
|
' }',
|
|
' return true;',
|
|
'}']);
|
|
code = functionName + '(' + number_to_check + ')';
|
|
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
|
|
}
|
|
switch (dropdown_property) {
|
|
case 'EVEN':
|
|
code = number_to_check + ' % 2 === 0';
|
|
break;
|
|
case 'ODD':
|
|
code = number_to_check + ' % 2 === 1';
|
|
break;
|
|
case 'WHOLE':
|
|
code = number_to_check + ' % 1 === 0';
|
|
break;
|
|
case 'POSITIVE':
|
|
code = number_to_check + ' > 0';
|
|
break;
|
|
case 'NEGATIVE':
|
|
code = number_to_check + ' < 0';
|
|
break;
|
|
case 'DIVISIBLE_BY':
|
|
var divisor = Blockly.JavaScript.valueToCode(block, 'DIVISOR',
|
|
Blockly.JavaScript.ORDER_MODULUS) || '0';
|
|
code = number_to_check + ' % ' + divisor + ' === 0';
|
|
break;
|
|
}
|
|
return [code, Blockly.JavaScript.ORDER_EQUALITY];
|
|
};
|
|
|
|
Blockly.JavaScript['math_change'] = function(block) {
|
|
// Add to a variable in place.
|
|
var argument0 = Blockly.JavaScript.valueToCode(block, 'DELTA',
|
|
Blockly.JavaScript.ORDER_ADDITION) || '0';
|
|
var varName = Blockly.JavaScript.nameDB_.getName(
|
|
block.getFieldValue('VAR'), Blockly.VARIABLE_CATEGORY_NAME);
|
|
return varName + ' = (typeof ' + varName + ' === \'number\' ? ' + varName +
|
|
' : 0) + ' + argument0 + ';\n';
|
|
};
|
|
|
|
// Rounding functions have a single operand.
|
|
Blockly.JavaScript['math_round'] = Blockly.JavaScript['math_single'];
|
|
// Trigonometry functions have a single operand.
|
|
Blockly.JavaScript['math_trig'] = Blockly.JavaScript['math_single'];
|
|
|
|
Blockly.JavaScript['math_on_list'] = function(block) {
|
|
// Math functions for lists.
|
|
var func = block.getFieldValue('OP');
|
|
var list, code;
|
|
switch (func) {
|
|
case 'SUM':
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_MEMBER) || '[]';
|
|
code = list + '.reduce(function(x, y) {return x + y;})';
|
|
break;
|
|
case 'MIN':
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_NONE) || '[]';
|
|
code = 'Math.min.apply(null, ' + list + ')';
|
|
break;
|
|
case 'MAX':
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_NONE) || '[]';
|
|
code = 'Math.max.apply(null, ' + list + ')';
|
|
break;
|
|
case 'AVERAGE':
|
|
// mathMean([null,null,1,3]) === 2.0.
|
|
var functionName = Blockly.JavaScript.provideFunction_(
|
|
'mathMean',
|
|
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
|
|
'(myList) {',
|
|
' return myList.reduce(function(x, y) {return x + y;}) / ' +
|
|
'myList.length;',
|
|
'}']);
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_NONE) || '[]';
|
|
code = functionName + '(' + list + ')';
|
|
break;
|
|
case 'MEDIAN':
|
|
// mathMedian([null,null,1,3]) === 2.0.
|
|
var functionName = Blockly.JavaScript.provideFunction_(
|
|
'mathMedian',
|
|
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
|
|
'(myList) {',
|
|
' var localList = myList.filter(function (x) ' +
|
|
'{return typeof x === \'number\';});',
|
|
' if (!localList.length) return null;',
|
|
' localList.sort(function(a, b) {return b - a;});',
|
|
' if (localList.length % 2 === 0) {',
|
|
' return (localList[localList.length / 2 - 1] + ' +
|
|
'localList[localList.length / 2]) / 2;',
|
|
' } else {',
|
|
' return localList[(localList.length - 1) / 2];',
|
|
' }',
|
|
'}']);
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_NONE) || '[]';
|
|
code = functionName + '(' + list + ')';
|
|
break;
|
|
case 'MODE':
|
|
// As a list of numbers can contain more than one mode,
|
|
// the returned result is provided as an array.
|
|
// Mode of [3, 'x', 'x', 1, 1, 2, '3'] -> ['x', 1].
|
|
var functionName = Blockly.JavaScript.provideFunction_(
|
|
'mathModes',
|
|
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
|
|
'(values) {',
|
|
' var modes = [];',
|
|
' var counts = [];',
|
|
' var maxCount = 0;',
|
|
' for (var i = 0; i < values.length; i++) {',
|
|
' var value = values[i];',
|
|
' var found = false;',
|
|
' var thisCount;',
|
|
' for (var j = 0; j < counts.length; j++) {',
|
|
' if (counts[j][0] === value) {',
|
|
' thisCount = ++counts[j][1];',
|
|
' found = true;',
|
|
' break;',
|
|
' }',
|
|
' }',
|
|
' if (!found) {',
|
|
' counts.push([value, 1]);',
|
|
' thisCount = 1;',
|
|
' }',
|
|
' maxCount = Math.max(thisCount, maxCount);',
|
|
' }',
|
|
' for (var j = 0; j < counts.length; j++) {',
|
|
' if (counts[j][1] === maxCount) {',
|
|
' modes.push(counts[j][0]);',
|
|
' }',
|
|
' }',
|
|
' return modes;',
|
|
'}']);
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_NONE) || '[]';
|
|
code = functionName + '(' + list + ')';
|
|
break;
|
|
case 'STD_DEV':
|
|
var functionName = Blockly.JavaScript.provideFunction_(
|
|
'mathStandardDeviation',
|
|
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
|
|
'(numbers) {',
|
|
' var n = numbers.length;',
|
|
' if (!n) return null;',
|
|
' var mean = numbers.reduce(function(x, y) {return x + y;}) / n;',
|
|
' var variance = 0;',
|
|
' for (var j = 0; j < n; j++) {',
|
|
' variance += Math.pow(numbers[j] - mean, 2);',
|
|
' }',
|
|
' variance = variance / n;',
|
|
' return Math.sqrt(variance);',
|
|
'}']);
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_NONE) || '[]';
|
|
code = functionName + '(' + list + ')';
|
|
break;
|
|
case 'RANDOM':
|
|
var functionName = Blockly.JavaScript.provideFunction_(
|
|
'mathRandomList',
|
|
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
|
|
'(list) {',
|
|
' var x = Math.floor(Math.random() * list.length);',
|
|
' return list[x];',
|
|
'}']);
|
|
list = Blockly.JavaScript.valueToCode(block, 'LIST',
|
|
Blockly.JavaScript.ORDER_NONE) || '[]';
|
|
code = functionName + '(' + list + ')';
|
|
break;
|
|
default:
|
|
throw Error('Unknown operator: ' + func);
|
|
}
|
|
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
|
|
};
|
|
|
|
Blockly.JavaScript['math_modulo'] = function(block) {
|
|
// Remainder computation.
|
|
var argument0 = Blockly.JavaScript.valueToCode(block, 'DIVIDEND',
|
|
Blockly.JavaScript.ORDER_MODULUS) || '0';
|
|
var argument1 = Blockly.JavaScript.valueToCode(block, 'DIVISOR',
|
|
Blockly.JavaScript.ORDER_MODULUS) || '0';
|
|
var code = argument0 + ' % ' + argument1;
|
|
return [code, Blockly.JavaScript.ORDER_MODULUS];
|
|
};
|
|
|
|
Blockly.JavaScript['math_constrain'] = function(block) {
|
|
// Constrain a number between two limits.
|
|
var argument0 = Blockly.JavaScript.valueToCode(block, 'VALUE',
|
|
Blockly.JavaScript.ORDER_NONE) || '0';
|
|
var argument1 = Blockly.JavaScript.valueToCode(block, 'LOW',
|
|
Blockly.JavaScript.ORDER_NONE) || '0';
|
|
var argument2 = Blockly.JavaScript.valueToCode(block, 'HIGH',
|
|
Blockly.JavaScript.ORDER_NONE) || 'Infinity';
|
|
var code = 'Math.min(Math.max(' + argument0 + ', ' + argument1 + '), ' +
|
|
argument2 + ')';
|
|
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
|
|
};
|
|
|
|
Blockly.JavaScript['math_random_int'] = function(block) {
|
|
// Random integer between [X] and [Y].
|
|
var argument0 = Blockly.JavaScript.valueToCode(block, 'FROM',
|
|
Blockly.JavaScript.ORDER_NONE) || '0';
|
|
var argument1 = Blockly.JavaScript.valueToCode(block, 'TO',
|
|
Blockly.JavaScript.ORDER_NONE) || '0';
|
|
var functionName = Blockly.JavaScript.provideFunction_(
|
|
'mathRandomInt',
|
|
['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
|
|
'(a, b) {',
|
|
' if (a > b) {',
|
|
' // Swap a and b to ensure a is smaller.',
|
|
' var c = a;',
|
|
' a = b;',
|
|
' b = c;',
|
|
' }',
|
|
' return Math.floor(Math.random() * (b - a + 1) + a);',
|
|
'}']);
|
|
var code = functionName + '(' + argument0 + ', ' + argument1 + ')';
|
|
return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
|
|
};
|
|
|
|
Blockly.JavaScript['math_random_float'] = function(block) {
|
|
// Random fraction between 0 and 1.
|
|
return ['Math.random()', Blockly.JavaScript.ORDER_FUNCTION_CALL];
|
|
};
|
|
|
|
Blockly.JavaScript['math_atan2'] = function(block) {
|
|
// Arctangent of point (X, Y) in degrees from -180 to 180.
|
|
var argument0 = Blockly.JavaScript.valueToCode(block, 'X',
|
|
Blockly.JavaScript.ORDER_NONE) || '0';
|
|
var argument1 = Blockly.JavaScript.valueToCode(block, 'Y',
|
|
Blockly.JavaScript.ORDER_NONE) || '0';
|
|
return ['Math.atan2(' + argument1 + ', ' + argument0 + ') / Math.PI * 180',
|
|
Blockly.JavaScript.ORDER_DIVISION];
|
|
};
|