add mstch

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/mstch/src/visitor/render_section.hpp b/lib/mstch/src/visitor/render_section.hpp
new file mode 100644
index 0000000..f2d5259
--- /dev/null
+++ b/lib/mstch/src/visitor/render_section.hpp
@@ -0,0 +1,57 @@
+#pragma once
+
+#include <boost/variant/static_visitor.hpp>
+
+#include "render_context.hpp"
+#include "mstch/mstch.hpp"
+#include "utils.hpp"
+#include "render_node.hpp"
+
+namespace mstch {
+
+class render_section: public boost::static_visitor<std::string> {
+ public:
+  enum class flag { none, keep_array };
+  render_section(
+      render_context& ctx,
+      const template_type& section,
+      const delim_type& delims,
+      flag p_flag = flag::none):
+      m_ctx(ctx), m_section(section), m_delims(delims), m_flag(p_flag)
+  {
+  }
+
+  template<class T>
+  std::string operator()(const T& t) const {
+    return render_context::push(m_ctx, t).render(m_section);
+  }
+
+  std::string operator()(const lambda& fun) const {
+    std::string section_str;
+    for (auto& token: m_section)
+      section_str += token.raw();
+    template_type interpreted{fun([this](const mstch::node& n) {
+      return visit(render_node(m_ctx), n);
+    }, section_str), m_delims};
+    return render_context::push(m_ctx).render(interpreted);
+  }
+
+  std::string operator()(const array& array) const {
+    std::string out;
+    if (m_flag == flag::keep_array)
+      return render_context::push(m_ctx, array).render(m_section);
+    else
+      for (auto& item: array)
+        out += visit(render_section(
+            m_ctx, m_section, m_delims, flag::keep_array), item);
+    return out;
+  }
+
+ private:
+  render_context& m_ctx;
+  const template_type& m_section;
+  const delim_type& m_delims;
+  flag m_flag;
+};
+
+}