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with.spec.js
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151 lines (112 loc) · 3.95 KB
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import Core from "../lib/core";
const Patterns = Core.Patterns;
const SpecialForms = Core.SpecialForms;
const Tuple = Core.Tuple;
const MatchError = Core.Patterns.MatchError;
import Enum from "../lib/enum";
import chai from 'chai';
var expect = chai.expect;
const $ = Patterns.variable();
function map_fetch(map, key){
if(key in map){
return new Tuple(Symbol.for('ok'), map[key]);
}
return Symbol.for('error');
}
describe('with', () => {
it('normal', () => {
/*
opts = %{width: 10, height: 15}
with {:ok, width} <- Map.fetch(opts, :width),
{:ok, height} <- Map.fetch(opts, :height),
do: {:ok, width * height}
{:ok, 150}
*/
let opts = { width: 10, height: 15 };
let value = SpecialForms._with(
[new Tuple(Symbol.for('ok'), $), () => map_fetch(opts, "width")],
[new Tuple(Symbol.for('ok'), $), (width) => map_fetch(opts, "height")],
(width, height) => new Tuple(Symbol.for('ok'), width * height)
);
expect(value).to.eql(new Tuple(Symbol.for('ok'), 150));
});
it('without match', () => {
/*
opts = %{width: 10}
with {:ok, width} <- Map.fetch(opts, :width),
{:ok, height} <- Map.fetch(opts, :height),
do: {:ok, width * height}
:error
*/
let opts = { width: 10 };
let value = SpecialForms._with(
[new Tuple(Symbol.for('ok'), $), () => map_fetch(opts, "width")],
[new Tuple(Symbol.for('ok'), $), (width) => map_fetch(opts, "height")],
(width, height) => new Tuple(Symbol.for('ok'), width * height)
);
expect(value).to.eql(Symbol.for('error'));
});
it('bare expression', () => {
/*
opts = %{width: 10}
with {:ok, width} <- Map.fetch(opts, :width),
double_width = width * 2,
{:ok, height} <- Map.fetch(opts, :height),
do: {:ok, double_width * height}
{:ok, 300}
*/
let opts = { width: 10, height: 15 };
let value = SpecialForms._with(
[new Tuple(Symbol.for('ok'), $), () => map_fetch(opts, "width")],
[$, (width) => width * 2],
[new Tuple(Symbol.for('ok'), $), (width, double_width) => map_fetch(opts, "height")],
(width, double_width, height) => new Tuple(Symbol.for('ok'), double_width * height)
);
expect(value).to.eql(new Tuple(Symbol.for('ok'), 300));
});
it('with else', () => {
/*
opts = %{width: 10}
with {:ok, width} <- Map.fetch(opts, :width),
{:ok, height} <- Map.fetch(opts, :height) do
{:ok, width * height}
else
:error -> {:error, :wrong_data}
end
{:error, :wrong_data}
*/
let opts = { width: 10 };
let value = SpecialForms._with(
[new Tuple(Symbol.for('ok'), $), () => map_fetch(opts, "width")],
[new Tuple(Symbol.for('ok'), $), (width) => map_fetch(opts, "height")],
(width, height) => new Tuple(Symbol.for('ok'), width * height),
Patterns.defmatch(
Patterns.clause([Symbol.for('error')], () => new Tuple(Symbol.for('error'), Symbol.for('wrong_data')))
)
);
expect(value).to.eql(new Tuple(Symbol.for('error'), Symbol.for('wrong_data')));
});
it('with else that don`t match', () => {
/*
opts = %{width: 10}
with {:ok, width} <- Map.fetch(opts, :width),
{:ok, height} <- Map.fetch(opts, :height) do
{:ok, width * height}
else
:fail -> {:error, :wrong_data}
end
{:error, :wrong_data}
*/
let opts = { width: 10 };
let withFunction = SpecialForms._with.bind(
null,
[new Tuple(Symbol.for('ok'), $), () => map_fetch(opts, "width")],
[new Tuple(Symbol.for('ok'), $), (width) => map_fetch(opts, "height")],
(width, height) => new Tuple(Symbol.for('ok'), width * height),
Patterns.defmatch(
Patterns.clause([Symbol.for('fail')], () => new Tuple(Symbol.for('error'), Symbol.for('wrong_data')))
)
);
expect(withFunction).to.throw(MatchError, 'No match for: Symbol(error)');
});
});