# encoding=utf-8
require 'spec_helper'

describe Polytexnic::Pipeline do
  subject(:processed_text) { Polytexnic::Pipeline.new(polytex).to_html }

  describe "display and inline math" do
    let(:math) do <<-'EOS'
      \begin{bmatrix}
      1 & \cdots & 0 \\
      \vdots & \ddots & \vdots \\
      2 & \cdots & 0
      \end{bmatrix}
      EOS
    end

    let(:result) do <<-'EOS'
      \begin{bmatrix}
      1 &amp; \cdots &amp; 0 \\
      \vdots &amp; \ddots &amp; \vdots \\
      2 &amp; \cdots &amp; 0
      \end{bmatrix}
      EOS
    end

    context "TeX displaystyle" do
      let(:equation) { "$$ #{math} $$"}
      let(:polytex)  { equation }
      let(:contents) { "\\[ #{result} \\]"}

      it { should resemble contents }
    end

    context "LaTeX displaystyle" do
      let(:equation) { "\\[ #{math} \\]"}
      let(:polytex)  { equation }
      let(:contents) { "\\[ #{result} \\]"}

      it { should resemble contents }

      context "with surrounding text" do
        let(:polytex) { "lorem\n\\[ #{math} \\]\nipsum" }
        it { should resemble '<p class="noindent">' }
      end
    end

    context "TeX inline" do
      let(:equation) { "$#{math}$"}
      let(:polytex)  { equation }
      let(:contents) { "\\( #{result} \\)"}

      it { should resemble contents }
    end

    context "TeX inline with a dollar sign" do
      let(:equation) { "$#{math} \\mbox{\\$2 bill}$"}
      let(:polytex)  { equation }
      let(:contents) { "\\( #{result} \\mbox{\\$2 bill} \\)"}

      it { should resemble contents }
    end

    context "LaTeX inline" do
      let(:equation) { "\\( #{math} \\)" }
      let(:polytex)  { equation }
      let(:contents) { "\\( #{result} \\)" }

      it { should resemble contents }
    end

    context "with a space before a dollar sign" do
      let(:polytex) { "foo $x$ bar" }
      let(:contents) { "<p>foo <span class=\"inline_math\">\\( x \\)</span> bar" }
      it { should include contents }
    end

    context 'using \ensuremath' do
      let(:math) { 'x^2 + y' }
      let(:equation) { "\\ensuremath{#{math}}" }
      let(:polytex)  { equation }
      let(:contents) { "\\( #{math} \\)" }
      it { should include contents }
    end
  end

  describe "multiple occurrences of inline math on one line" do
    let(:polytex) { '$\Omega > 0$ and \( x^2 - 2 \equiv 0 \) should work.' }

    it { should resemble '\Omega' }
    it { should resemble '\equiv' }
    it { should resemble '<span class="inline_math">' }
    it { should resemble '\(' }
  end

  describe "equation environments" do

    shared_examples "an equation environment" do
      it { should resemble contents }
      it { should resemble '<div' }
      it { should resemble 'class="equation"' }
    end

    context "alone" do
      let(:equation) do <<-'EOS'
        \begin{equation}
        \int_\Omega d\omega = \int_{\partial\Omega} \omega
        \end{equation}
      EOS
      end
      let(:polytex)  { equation }
      let(:contents) { equation }

      it_behaves_like "an equation environment"
    end

    context "with a label and cross-reference" do
      let(:equation) do <<-'EOS'
        \chapter{Foo}
        \begin{equation}
        \label{stokes_theorem}
        \int_\Omega d\omega = \int_{\partial\Omega} \omega
        \end{equation}

        Eq.~\eqref{stokes_theorem} or \eqref{stokes_theorem}
      EOS
      end
      let(:polytex)  { equation }
      let(:contents) do <<-'EOS'
        <div id="cid1" data-tralics-id="cid1" class="chapter" data-number="1"><h1><a href="#cid1" class="heading"><span class="number">Chapter 1 </span>Foo</a></h1>
        <div id="stokes_theorem" data-tralics-id="uid1" data-number="1.1" class="equation">
               \begin{equation}
               \label{stokes_theorem}
               \int_\Omega d\omega = \int_{\partial\Omega} \omega
               \end{equation}
        </div>
        <p class="noindent"><a href="#stokes_theorem" class="hyperref">Eq. (<span class="ref">1.1</span>)</a>
        or
        <a href="#stokes_theorem" class="hyperref">(<span class="ref">1.1</span>)</a>
        </p>
      EOS
      end

      it_behaves_like "an equation environment"
    end

    context "surrounded by text" do
      let(:equation) do <<-'EOS'
        \begin{equation}
        \int_\Omega d\omega = \int_{\partial\Omega} \omega
        \end{equation}
        EOS
      end
      let(:polytex)  { "lorem\n" + equation + "\nipsum" }
      let(:contents) { equation }

      it_behaves_like "an equation environment"
      it { should resemble '<p>lorem' }
      it { should resemble '<p class="noindent">ipsum' }
    end

    describe "align" do
      let(:equation) do <<-'EOS'
        \begin{align}
        x^2 + y^2 & = 1 \\
        y & = \sqrt{1 - x^2}.
        \end{align}
        EOS
      end
      let(:polytex) { equation }
      let(:contents) do <<-'EOS'
        \begin{align}
        x^2 + y^2 &amp; = 1 \\
        y &amp; = \sqrt{1 - x^2}.
        \end{align}
        EOS
      end

      it_behaves_like "an equation environment"
    end

    describe "align*" do
      let(:equation) do <<-'EOS'
        \begin{align*}
        x^2 + y^2 & = 1 \\
        y & = \sqrt{1 - x^2}.
        \end{align*}
        EOS
      end
      let(:polytex) { equation }
      let(:contents) do <<-'EOS'
        \begin{align*}
        x^2 + y^2 &amp; = 1 \\
        y &amp; = \sqrt{1 - x^2}.
        \end{align*}
      EOS
      end

      it_behaves_like "an equation environment"
    end

    describe "aligned" do
      let(:equation) do <<-'EOS'
        \begin{equation}
        \begin{aligned}
        \nabla \times \vec{\mathbf{B}} -\, \frac1c\,
        \frac{\partial\vec{\mathbf{E}}}{\partial t} & =
        \frac{4\pi}{c}\vec{\mathbf{j}} \\   \nabla \cdot \vec{\mathbf{E}} & =
        4 \pi \rho \\
        \nabla \times \vec{\mathbf{E}}\, +\, \frac1c\,
        \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
        \nabla \cdot \vec{\mathbf{B}} & = 0
        \end{aligned}
        \end{equation}
        EOS
      end
      let(:polytex) { equation }
      let(:contents) do <<-'EOS'
        \begin{equation}
        \begin{aligned}
        \nabla \times \vec{\mathbf{B}} -\, \frac1c\,
        \frac{\partial\vec{\mathbf{E}}}{\partial t} &amp; =
        \frac{4\pi}{c}\vec{\mathbf{j}} \\   \nabla \cdot \vec{\mathbf{E}} &amp;
        = 4 \pi \rho \\
        \nabla \times \vec{\mathbf{E}}\, +\, \frac1c\,
        \frac{\partial\vec{\mathbf{B}}}{\partial t} &amp; = \vec{\mathbf{0}} \\
        \nabla \cdot \vec{\mathbf{B}} &amp; = 0
        \end{aligned}
        \end{equation}
        EOS
      end

      it_behaves_like "an equation environment"
    end

    describe "equation*" do
      let(:equation) do <<-'EOS'
        \begin{equation*}
        \left.\begin{aligned}
        dE  &= \rho \\
        d*B &= J + \dot{E}
        \end{aligned}
        \right\}
        \qquad \text{Maxwell}
        \end{equation*}
        EOS
      end
      let(:polytex) { equation }
      let(:contents) do <<-'EOS'
        \begin{equation*}
        \left.\begin{aligned}
        dE  &amp;= \rho \\
        d*B &amp;= J + \dot{E}
        \end{aligned}
        \right\}
        \qquad \text{Maxwell}
        \end{equation*}
        EOS
      end

      it_behaves_like "an equation environment"
    end
  end
end