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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Banzai::Filter::MathFilter do
include FilterSpecHelper
it 'leaves regular inline code unchanged' do
input = "<code>2+2</code>"
doc = filter(input)
expect(doc.to_s).to eq input
end
it 'removes surrounding dollar signs and adds class code, math and js-render-math' do
doc = filter("$<code>2+2</code>$")
expect(doc.to_s).to eq '<code class="code math js-render-math" data-math-style="inline">2+2</code>'
end
it 'only removes surrounding dollar signs' do
doc = filter("test $<code>2+2</code>$ test")
before = doc.xpath('descendant-or-self::text()[1]').first
after = doc.xpath('descendant-or-self::text()[3]').first
expect(before.to_s).to eq 'test '
expect(after.to_s).to eq ' test'
end
it 'only removes surrounding single dollar sign' do
doc = filter("test $$<code>2+2</code>$$ test")
before = doc.xpath('descendant-or-self::text()[1]').first
after = doc.xpath('descendant-or-self::text()[3]').first
expect(before.to_s).to eq 'test $'
expect(after.to_s).to eq '$ test'
end
it 'adds data-math-style inline attribute to inline math' do
doc = filter('$<code>2+2</code>$')
code = doc.xpath('descendant-or-self::code').first
expect(code['data-math-style']).to eq 'inline'
end
it 'adds class code and math to inline math' do
doc = filter('$<code>2+2</code>$')
code = doc.xpath('descendant-or-self::code').first
expect(code[:class]).to include("code")
expect(code[:class]).to include("math")
end
it 'adds js-render-math class to inline math' do
doc = filter('$<code>2+2</code>$')
code = doc.xpath('descendant-or-self::code').first
expect(code[:class]).to include("js-render-math")
end
# Cases with faulty syntax. Should be a no-op
it 'ignores cases with missing dolar sign at the end' do
input = "test $<code>2+2</code> test"
doc = filter(input)
expect(doc.to_s).to eq input
end
it 'ignores cases with missing dolar sign at the beginning' do
input = "test <code>2+2</code>$ test"
doc = filter(input)
expect(doc.to_s).to eq input
end
it 'ignores dollar signs if it is not adjacent' do
input = '<p>We check strictly $<code>2+2</code> and <code>2+2</code>$ </p>'
doc = filter(input)
expect(doc.to_s).to eq input
end
it 'ignores dollar signs if they are inside another element' do
input = '<p>We check strictly <em>$</em><code>2+2</code><em>$</em></p>'
doc = filter(input)
expect(doc.to_s).to eq input
end
# Display math
it 'adds data-math-style display attribute to display math' do
doc = filter('<pre class="code highlight js-syntax-highlight language-math" v-pre="true"><code>2+2</code></pre>')
pre = doc.xpath('descendant-or-self::pre').first
expect(pre['data-math-style']).to eq 'display'
end
it 'adds js-render-math class to display math' do
doc = filter('<pre class="code highlight js-syntax-highlight language-math" v-pre="true"><code>2+2</code></pre>')
pre = doc.xpath('descendant-or-self::pre').first
expect(pre[:class]).to include("js-render-math")
end
it 'ignores code blocks that are not math' do
input = '<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true"><code>2+2</code></pre>'
doc = filter(input)
expect(doc.to_s).to eq input
end
it 'requires the pre to contain both code and math' do
input = '<pre class="highlight js-syntax-highlight language-plaintext language-math" v-pre="true"><code>2+2</code></pre>'
doc = filter(input)
expect(doc.to_s).to eq input
end
it 'dollar signs around to display math' do
doc = filter('$<pre class="code highlight js-syntax-highlight language-math" v-pre="true"><code>2+2</code></pre>$')
before = doc.xpath('descendant-or-self::text()[1]').first
after = doc.xpath('descendant-or-self::text()[3]').first
expect(before.to_s).to eq '$'
expect(after.to_s).to eq '$'
end
it 'limits how many elements can be marked as math' do
stub_const('Banzai::Filter::MathFilter::RENDER_NODES_LIMIT', 2)
doc = filter('$<code>2+2</code>$ + $<code>3+3</code>$ + $<code>4+4</code>$')
expect(doc.search('.js-render-math').count).to eq(2)
end
end
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