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Some additional helper functions #7

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3dceb6e
fixed some changes
aliang8 Jun 28, 2017
b862d6f
added tests and fixed function
aliang8 Jun 30, 2017
c72cb3d
fixed getCofficientAndConstant
aliang8 Jun 30, 2017
f1d1e81
pushing
aliang8 Jun 30, 2017
9ccc904
fixed getCoefficientAndConstants
aliang8 Jun 30, 2017
4f769a2
fixed comments
aliang8 Jul 1, 2017
fc21cc9
fix 2^2 case
aliang8 Jul 1, 2017
7a26bad
nodeEquals in hasSameBase
aliang8 Jul 2, 2017
cbc3bb9
revert package
aliang8 Jul 2, 2017
b14fdeb
fixed some helper functions
aliang8 Jul 4, 2017
2ecf06c
fixes
aliang8 Jul 4, 2017
623f926
merge with master
aliang8 Jul 4, 2017
e94f341
made some changes
aliang8 Jul 4, 2017
0c40e27
more fixes
aliang8 Jul 4, 2017
b21ee85
fix getVariableFactors
aliang8 Jul 4, 2017
29938d4
fix getVariableFactors
aliang8 Jul 4, 2017
c669902
fixed
aliang8 Jul 5, 2017
2b31dfd
added some more changes to getCoefficientAndConstants
aliang8 Jul 5, 2017
62f8a0d
revert lines
aliang8 Jul 6, 2017
acde4be
added hasCoeff and negate
aliang8 Jul 6, 2017
8c5671b
fix lint
aliang8 Jul 6, 2017
caf9282
merge with master
aliang8 Jul 6, 2017
5df8e66
fixed comments
aliang8 Jul 6, 2017
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144 changes: 144 additions & 0 deletions lib/__test__/__snapshots__/query.test.js.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -177,6 +177,45 @@ exports[`query getCoefficientsAndConstants 3x^2 * 2x^2 1`] = `
}
`;

exports[`query getCoefficientsAndConstants x + 4 + 2^x + x 1`] = `
{
"others": [
{
"type": "Apply",
"op": "pow",
"args": [
{
"value": "2",
"type": "Number"
},
{
"type": "Identifier",
"name": "x"
}
]
}
],
"constants": [
{
"value": "4",
"type": "Number"
}
],
"coefficientMap": {
"x": [
{
"value": "1",
"type": "Number"
},
{
"value": "1",
"type": "Number"
}
]
}
}
`;

exports[`query getCoefficientsAndConstants x^3 + y^3 + x y z + 3 1`] = `
{
"others": [
Expand Down Expand Up @@ -210,6 +249,55 @@ exports[`query getCoefficientsAndConstants x^3 + y^3 + x y z + 3 1`] = `
}
`;

exports[`query getCoefficientsAndConstants z + 2*(y + x) + 4 + z 1`] = `
{
"others": [
{
"type": "Apply",
"op": "mul",
"args": [
{
"value": "2",
"type": "Number"
},
{
"type": "Apply",
"op": "add",
"args": [
{
"type": "Identifier",
"name": "y"
},
{
"type": "Identifier",
"name": "x"
}
]
}
]
}
],
"constants": [
{
"value": "4",
"type": "Number"
}
],
"coefficientMap": {
"z": [
{
"value": "1",
"type": "Number"
},
{
"value": "1",
"type": "Number"
}
]
}
}
`;

exports[`query getVariableFactors 2 x y z 1`] = `
[
{
Expand All @@ -236,6 +324,29 @@ exports[`query getVariableFactors 2x 1`] = `
]
`;

exports[`query getVariableFactors 2x^2 * y 1`] = `
[
{
"type": "Apply",
"op": "pow",
"args": [
{
"type": "Identifier",
"name": "x"
},
{
"value": "2",
"type": "Number"
}
]
},
{
"type": "Identifier",
"name": "y"
}
]
`;

exports[`query getVariableFactors 2x^2 1`] = `
[
{
Expand All @@ -255,6 +366,39 @@ exports[`query getVariableFactors 2x^2 1`] = `
]
`;

exports[`query getVariableFactors x^2 * 2/3 y^2 1`] = `
[
{
"type": "Apply",
"op": "pow",
"args": [
{
"type": "Identifier",
"name": "x"
},
{
"value": "2",
"type": "Number"
}
]
},
{
"type": "Apply",
"op": "pow",
"args": [
{
"type": "Identifier",
"name": "y"
},
{
"value": "2",
"type": "Number"
}
]
}
]
`;

exports[`query getVariableFactors x^2 1`] = `
[
{
Expand Down
40 changes: 34 additions & 6 deletions lib/__test__/query.test.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import assert from 'assert'
import {parse} from 'math-parser'
import {parse, print} from 'math-parser'
import stringify from 'json-stable-stringify'

import * as query from '../query'
Expand Down Expand Up @@ -54,6 +54,8 @@ describe('query', () => {
'x^2',
'2x^2',
'2 x y z',
'2x^2 * y',
'x^2 * 2/3 y^2'
])

suite('getCoefficientsAndConstants', query.getCoefficientsAndConstants, [
Expand All @@ -65,7 +67,9 @@ describe('query', () => {
'x^3 + y^3 + x y z + 3',
'2/3 + 3 + cos(4)',
'3x^2 * 2x^2',
'2/3(x + 1)^1'
'2/3(x + 1)^1',
'x + 4 + 2^x + x',
'z + 2*(y + x) + 4 + z'
])

it('isVariableFactor', () => {
Expand Down Expand Up @@ -106,6 +110,27 @@ describe('query', () => {
assert(!query.isPolynomial(parse('1/x')))
})

it('hasCoeff', () => {
assert(query.hasCoeff(parse('2x')))
assert(query.hasCoeff(parse('2x^2')))
assert(query.hasCoeff(parse('2 x y z')))
assert(!query.hasCoeff(parse('2')))
assert(!query.hasCoeff(parse('x')))
})

it('negate', () => {
assert.equal(print(build.negate(parse('2'))), -2)
assert.equal(print(build.negate(parse('2x^2'))), '-2 x^2')
assert.equal(print(build.negate(parse('2xyz'))), '-2 xyz')
assert.equal(print(build.negate(parse('-2'))), 2)
assert.equal(print(build.negate(parse('-2x^2'))), '2 x^2')
assert.equal(print(build.negate(parse('-2x^2 y^2'))), '2 x^2 y^2')
assert.equal(print(build.negate(parse('2x^2 y^2'))), '-2 x^2 y^2')
assert.equal(print(build.negate(parse('2/3'))), '-2 / 3')
assert.equal(print(build.negate(parse('-2/3'))), '2 / 3')
assert.equal(print(build.negate(parse('(x+3)/3'))), '-(x + 3) / 3')
})

it('hasSameBase', () => {
assert(query.hasSameBase(parse('x^1'), parse('x^2')))
assert(query.hasSameBase(parse('(x+1)^2'), parse('(x+1)^x')))
Expand Down Expand Up @@ -262,10 +287,13 @@ describe('query', () => {
assert(!query.isRel(x))
})

it('isNumber', () => {
assert(query.isNumber(a))
assert(query.isNumber(parse('-2')))
assert(!query.isNumber(x))
it('isRationalNumber', () => {
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@k4b7 k4b7 Jul 6, 2017

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Maybe add some tests that check for factions and decimals.

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@aliang8 aliang8 Jul 6, 2017

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👍

assert(query.isRationalNumber(a))
assert(query.isRationalNumber(parse('-2')))
assert(query.isRationalNumber(parse('2/3')))
assert(query.isRationalNumber(parse('2.2')))
assert(!query.isRationalNumber(x))
assert(!query.isRationalNumber(parse('(2 + x)/2')))
})

it('getValue', () => {
Expand Down
22 changes: 22 additions & 0 deletions lib/build.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@
* Functions to build nodes
*/

const q = require('./query.js')

export const apply = (op, args, options = {}) => ({
type: 'Apply',
op: op,
Expand Down Expand Up @@ -56,3 +58,23 @@ export const parensNode = parens
export const numberNode = number
export const identifierNode = identifier
export const applyNode = apply

// e.g 3 -> -3, -3x -> 3x, x + 3 -> -(x + 3), 2/3 -> -2 / 3
export const negate = (node) => {
if (q.isNeg(node)) {
return node.args[0]
} else if (q.isAdd(node)) {
return neg(node)
} else if (q.isFraction(node)) {
return div(negate(q.getNumerator(node)), q.getDenominator(node))
} else if (q.isPolynomialTerm(node)) {
if (q.isNeg(q.getCoefficient(node))) {
return apply(
'mul',
[negate(q.getCoefficient(node)), ...node.args.slice(1)],
{implicit: node.implicit})
} else {
return neg(node)
}
}
}
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