refactor: adjust code structure

4 files changed, 370 insertions, 297 deletions

diff --git a/src/render/input_renderer.cc b/src/render/input_renderer.cc
new file mode 100644
index 0000000..076fa2a
--- /dev/null
+++ b/src/render/input_renderer.cc
@@ -0,0 +1,82 @@
+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "ricochet/render/input_renderer.hh"
+#include "ricochet/render/internal.hh"
+#include "ricochet/render/utils.hh"
+
+namespace ricochet::render {
+
+namespace {
+
+std::string build_input_hint( const std::string& tag_name, bool checked )
+{
+  std::string placeholder = extract_attr( tag_name, "placeholder" );
+  const std::string type = extract_attr( tag_name, "type" );
+  std::string val = extract_attr( tag_name, "value" );
+
+  if ( !placeholder.empty() ) {
+    return placeholder;
+  }
+  if ( type == "submit" || type == "button" ) {
+    return val.empty() ? "Submit" : val;
+  }
+  if ( type == "checkbox" ) {
+    return checked ? "[X] " + val : "[ ] " + val;
+  }
+  if ( type == "radio" ) {
+    return checked ? "(X) " + val : "( ) " + val;
+  }
+  if ( type == "hidden" ) {
+    return "hidden";
+  }
+  if ( !val.empty() ) {
+    return val;
+  }
+  return "text";
+}
+
+} // namespace
+
+void render_input_node( const parser::DomNode& node,
+                        RenderResult& result,
+                        const FormContext& ctx,
+                        std::string& output )
+{
+  std::string type = extract_attr( node.tag_name, "type" );
+  const std::size_t space_pos = node.tag_name.find( ' ' );
+  const std::string base_tag
+    = ( space_pos == std::string::npos ) ? node.tag_name : node.tag_name.substr( 0, space_pos );
+  if ( base_tag == "button" && type.empty() ) {
+    type = "submit";
+  }
+  const std::string default_val = extract_attr( node.tag_name, "value" );
+  const bool is_checked = node.tag_name.contains( "checked" );
+  result.inputs.push_back(
+    { extract_attr( node.tag_name, "name" ), ctx.action, ctx.method, default_val, type, is_checked } );
+
+  std::string hint = build_input_hint( node.tag_name, is_checked );
+  if ( base_tag == "button" ) {
+    hint = "Submit";
+  }
+  if ( hint != "hidden" ) {
+    output += " \033[7;33m[I" + std::to_string( result.inputs.size() ) + ":" + hint + "]\033[0m ";
+  }
+}
+
+} // namespace ricochet::render
diff --git a/src/render/renderer.cc b/src/render/renderer.cc
index 53eca1b..7fb665f 100644
--- a/src/render/renderer.cc
+++ b/src/render/renderer.cc
@@ -17,92 +17,15 @@
  */
 
 #include "ricochet/render/renderer.hh"
-#include <algorithm>
-#include <array>
-#include <cstdint>
-#include <stdexcept>
+#include "ricochet/render/input_renderer.hh"
+#include "ricochet/render/internal.hh"
+#include "ricochet/render/table_renderer.hh"
+#include "ricochet/render/utils.hh"
 
 namespace ricochet::render {
 
 namespace {
 
-std::string decode_entities( std::string text )
-{
-  constexpr std::array<std::pair<std::string_view, std::string_view>, 25> entities
-    = { { { "&nbsp;", " " },   { "&lt;", "<" },     { "&gt;", ">" },     { "&amp;", "&" },   { "&quot;", "\"" },
-          { "&apos;", "'" },   { "&copy;", "©" },   { "&reg;", "®" },    { "&trade;", "™" }, { "&euro;", "€" },
-          { "&pound;", "£" },  { "&yen;", "¥" },    { "&cent;", "¢" },   { "&sect;", "§" },  { "&para;", "¶" },
-          { "&hellip;", "…" }, { "&dagger;", "†" }, { "&Dagger;", "‡" }, { "&bull;", "•" },  { "&prime;", "′" },
-          { "&Prime;", "″" },  { "&lsaquo;", "‹" }, { "&rsaquo;", "›" }, { "&oline;", "‾" }, { "&frasl;", "⁄" } } };
-
-  for ( const auto& [entity, replacement] : entities ) {
-    std::size_t pos = 0;
-    while ( ( pos = text.find( entity, pos ) ) != std::string::npos ) {
-      text.replace( pos, entity.length(), replacement );
-      pos += replacement.length();
-    }
-  }
-
-  std::size_t pos = 0;
-  while ( ( pos = text.find( "&#", pos ) ) != std::string::npos ) {
-    const std::size_t end = text.find( ';', pos );
-    if ( end != std::string::npos && end - pos < 10 ) {
-      const std::string code = text.substr( pos + 2, end - pos - 2 );
-      try {
-        std::uint32_t cp = 0;
-        if ( !code.empty() && ( code[0] == 'x' || code[0] == 'X' ) ) {
-          cp = std::stoul( code.substr( 1 ), nullptr, 16 );
-        } else {
-          cp = std::stoul( code );
-        }
-        if ( cp < 128 ) {
-          text.replace( pos, end - pos + 1, 1, static_cast<char>( cp ) );
-          continue;
-        }
-      } catch ( const std::invalid_argument& ) {
-        (void)0; // Not a valid number, leave as-is
-      } catch ( const std::out_of_range& ) {
-        (void)0; // Value too large, leave as-is
-      }
-    }
-    pos++;
-  }
-  return text;
-}
-
-std::string extract_attr( const std::string& tag_name, std::string_view attr_name )
-{
-  std::string match = " " + std::string( attr_name ) + "=";
-  std::size_t pos = tag_name.find( match );
-
-  if ( pos == std::string::npos ) {
-    match = std::string( attr_name ) + "=";
-    if ( !tag_name.starts_with( match ) ) {
-      return "";
-    }
-    pos = 0;
-  } else {
-    pos += 1;
-  }
-
-  pos += attr_name.length() + 1;
-  if ( pos >= tag_name.length() ) {
-    return "";
-  }
-
-  const char quote = tag_name[pos];
-  if ( quote == '"' || quote == '\'' ) {
-    const std::size_t end = tag_name.find( quote, pos + 1 );
-    if ( end != std::string::npos ) {
-      return tag_name.substr( pos + 1, end - pos - 1 );
-    }
-    return "";
-  }
-
-  const std::size_t end = tag_name.find_first_of( " >/", pos );
-  return tag_name.substr( pos, ( end == std::string::npos ) ? std::string::npos : end - pos );
-}
-
 void render_link_end( const parser::DomNode& node, RenderResult& result )
 {
   result.text += "\033[0m";
@@ -125,221 +48,9 @@ void render_img( const parser::DomNode& node, RenderResult& result )
   }
 }
 
-std::string build_input_hint( const std::string& tag_name, bool checked )
-{
-  std::string placeholder = extract_attr( tag_name, "placeholder" );
-  const std::string type = extract_attr( tag_name, "type" );
-  std::string val = extract_attr( tag_name, "value" );
-
-  if ( !placeholder.empty() ) {
-    return placeholder;
-  }
-  if ( type == "submit" || type == "button" ) {
-    return val.empty() ? "Submit" : val;
-  }
-  if ( type == "checkbox" ) {
-    return checked ? "[X] " + val : "[ ] " + val;
-  }
-  if ( type == "radio" ) {
-    return checked ? "(X) " + val : "( ) " + val;
-  }
-  if ( type == "hidden" ) {
-    return "hidden";
-  }
-  if ( !val.empty() ) {
-    return val;
-  }
-  return "text";
-}
-
-struct FormContext
-{
-  std::string action;
-  std::string method;
-};
-
-bool is_ignored_tag( std::string_view tag )
-{
-  return tag == "head" || tag == "style" || tag == "script" || tag == "meta" || tag == "title" || tag == "link";
-}
-
-bool is_heading_tag( std::string_view tag )
-{
-  return tag == "h1" || tag == "h2" || tag == "h3" || tag == "h4";
-}
-
-void render_input_node( const parser::DomNode& node,
-                        RenderResult& result,
-                        const FormContext& ctx,
-                        std::string& output )
-{
-  std::string type = extract_attr( node.tag_name, "type" );
-  const std::size_t space_pos = node.tag_name.find( ' ' );
-  const std::string base_tag
-    = ( space_pos == std::string::npos ) ? node.tag_name : node.tag_name.substr( 0, space_pos );
-  if ( base_tag == "button" && type.empty() ) {
-    type = "submit";
-  }
-  const std::string default_val = extract_attr( node.tag_name, "value" );
-  const bool is_checked = node.tag_name.contains( "checked" );
-  result.inputs.push_back(
-    { extract_attr( node.tag_name, "name" ), ctx.action, ctx.method, default_val, type, is_checked } );
-
-  std::string hint = build_input_hint( node.tag_name, is_checked );
-  if ( base_tag == "button" ) {
-    hint = "Submit";
-  }
-  if ( hint != "hidden" ) {
-    output += " \033[7;33m[I" + std::to_string( result.inputs.size() ) + ":" + hint + "]\033[0m ";
-  }
-}
-
-void render_node( const parser::DomNode& node, RenderResult& result, FormContext ctx );
-
-std::size_t get_visible_length( std::string_view str )
-{
-  std::size_t len = 0;
-  bool in_ansi = false;
-  for ( std::size_t i = 0; i < str.length(); ++i ) {
-    const auto c = static_cast<unsigned char>( str[i] );
-    if ( c == 0x1B ) {
-      in_ansi = true;
-    } else if ( in_ansi && c == 'm' ) {
-      in_ansi = false;
-    } else if ( !in_ansi ) {
-      if ( ( c & 0x80 ) == 0 || ( c & 0xE0 ) == 0xC0 ) {
-        len += 1;
-      } // ASCII (width 1) Latin/Greek (width 1)
-      else if ( ( c & 0xF0 ) == 0xE0 || ( c & 0xF8 ) == 0xF0 ) {
-        len += 2;
-      } // CJK (width 2) Emoji/Rare (width 2)
-    }
-  }
-  return len;
-}
-
-std::size_t get_node_text_len( const parser::DomNode& node ) // NOLINT(misc-no-recursion)
-{
-  std::size_t len = get_visible_length( decode_entities( node.text_content ) );
-  for ( const auto& child : node.children ) {
-    len += get_node_text_len( child );
-  }
-  return len;
-}
-
-void process_table_row_widths( const parser::DomNode& row, std::vector<std::size_t>& widths )
-{
-  std::size_t col_idx = 0;
-  for ( const auto& cell : row.children ) {
-    const std::size_t space_pos = cell.tag_name.find( ' ' );
-    const std::string tag
-      = ( space_pos == std::string::npos ) ? cell.tag_name : cell.tag_name.substr( 0, space_pos );
-    if ( tag == "td" || tag == "th" ) {
-      const std::size_t len = get_node_text_len( cell ) + 2;
-      if ( col_idx >= widths.size() ) {
-        widths.push_back( len );
-      } else if ( len > widths[col_idx] ) {
-        widths[col_idx] = len;
-      }
-      col_idx++;
-    }
-  }
-}
-
-std::vector<std::size_t> calc_table_widths( const parser::DomNode& table_node )
-{
-  std::vector<std::size_t> widths;
-  for ( const auto& child : table_node.children ) {
-    const std::size_t space_pos = child.tag_name.find( ' ' );
-    const std::string tag
-      = ( space_pos == std::string::npos ) ? child.tag_name : child.tag_name.substr( 0, space_pos );
-    if ( tag == "tr" ) {
-      process_table_row_widths( child, widths );
-    } else if ( tag == "tbody" || tag == "thead" ) {
-      for ( const auto& row : child.children ) {
-        if ( row.tag_name.starts_with( "tr" ) ) {
-          process_table_row_widths( row, widths );
-        }
-      }
-    }
-  }
-  for ( auto& w : widths ) {
-    w = std::min<std::size_t>( w, 30 );
-  }
-  return widths;
-}
-
-void render_table_row( const parser::DomNode& row, // NOLINT(misc-no-recursion)
-                       RenderResult& result,
-                       const FormContext& ctx,
-                       const std::vector<std::size_t>& widths )
-{
-  std::string& output = result.text;
-  output += "\033[90m|\033[0m ";
-  std::size_t col_idx = 0;
-  for ( const auto& cell : row.children ) {
-    const std::size_t cell_space = cell.tag_name.find( ' ' );
-    const std::string c_tag
-      = ( cell_space == std::string::npos ) ? cell.tag_name : cell.tag_name.substr( 0, cell_space );
-    if ( c_tag != "td" && c_tag != "th" ) {
-      continue;
-    }
-
-    const std::size_t text_start = output.size();
-    if ( c_tag == "th" ) {
-      output += "\033[1;36m";
-    }
-
-    for ( const auto& cell_child : cell.children ) {
-      render_node( cell_child, result, ctx );
-    }
-
-    if ( c_tag == "th" ) {
-      output += "\033[0m";
-    }
-
-    const std::string added = output.substr( text_start );
-    const std::size_t vis_len = get_visible_length( added );
-    const std::size_t tw = ( col_idx < widths.size() ) ? widths[col_idx] : 10;
-
-    if ( vis_len < tw ) {
-      output.append( tw - vis_len, ' ' );
-    }
-    output += " \033[90m|\033[0m ";
-    col_idx++;
-  }
-  output += "\n";
-}
-
-void render_table( const parser::DomNode& node, // NOLINT(misc-no-recursion)
-                   RenderResult& result,
-                   const FormContext& ctx )
-{
-  std::string& output = result.text;
-  const std::vector<std::size_t> widths = calc_table_widths( node );
-
-  output += "\n\033[90m+" + std::string( 78, '-' ) + "+\033[0m\n";
-
-  for ( const auto& child : node.children ) {
-    const std::size_t child_space = child.tag_name.find( ' ' );
-    const std::string child_tag
-      = ( child_space == std::string::npos ) ? child.tag_name : child.tag_name.substr( 0, child_space );
-    if ( child_tag == "tr" ) {
-      render_table_row( child, result, ctx, widths );
-    } else if ( child_tag == "tbody" || child_tag == "thead" ) {
-      for ( const auto& row : child.children ) {
-        if ( row.tag_name.starts_with( "tr" ) ) {
-          render_table_row( row, result, ctx, widths );
-        }
-      }
-    }
-  }
-  output += "\033[90m+" + std::string( 78, '-' ) + "+\033[0m\n";
-}
+} // namespace
 
-void render_node( const parser::DomNode& node, // NOLINT(misc-no-recursion)
-                  RenderResult& result,
-                  FormContext ctx )
+void render_node( const parser::DomNode& node, RenderResult& result, FormContext ctx ) // NOLINT(misc-no-recursion)
 {
   std::string& output = result.text;
   const std::size_t space_pos = node.tag_name.find( ' ' );
@@ -401,8 +112,6 @@ void render_node( const parser::DomNode& node, // NOLINT(misc-no-recursion)
   }
 }
 
-} // namespace
-
 RenderResult Renderer::render( // NOLINT(readability-convert-member-functions-to-static)
   const parser::DomNode& node ) const
 {
diff --git a/src/render/table_renderer.cc b/src/render/table_renderer.cc
new file mode 100644
index 0000000..37e6bfb
--- /dev/null
+++ b/src/render/table_renderer.cc
@@ -0,0 +1,147 @@
+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "ricochet/render/table_renderer.hh"
+#include "ricochet/render/internal.hh"
+#include "ricochet/render/utils.hh"
+#include <algorithm>
+
+namespace ricochet::render {
+
+namespace {
+
+std::size_t get_node_text_len( const parser::DomNode& node ) // NOLINT(misc-no-recursion)
+{
+  std::size_t len = get_visible_length( decode_entities( node.text_content ) );
+  for ( const auto& child : node.children ) {
+    len += get_node_text_len( child );
+  }
+  return len;
+}
+
+void process_table_row_widths( const parser::DomNode& row, std::vector<std::size_t>& widths )
+{
+  std::size_t col_idx = 0;
+  for ( const auto& cell : row.children ) {
+    const std::size_t space_pos = cell.tag_name.find( ' ' );
+    const std::string tag
+      = ( space_pos == std::string::npos ) ? cell.tag_name : cell.tag_name.substr( 0, space_pos );
+    if ( tag == "td" || tag == "th" ) {
+      const std::size_t len = get_node_text_len( cell ) + 2;
+      if ( col_idx >= widths.size() ) {
+        widths.push_back( len );
+      } else if ( len > widths[col_idx] ) {
+        widths[col_idx] = len;
+      }
+      col_idx++;
+    }
+  }
+}
+
+std::vector<std::size_t> calc_table_widths( const parser::DomNode& table_node )
+{
+  std::vector<std::size_t> widths;
+  for ( const auto& child : table_node.children ) {
+    const std::size_t space_pos = child.tag_name.find( ' ' );
+    const std::string tag
+      = ( space_pos == std::string::npos ) ? child.tag_name : child.tag_name.substr( 0, space_pos );
+    if ( tag == "tr" ) {
+      process_table_row_widths( child, widths );
+    } else if ( tag == "tbody" || tag == "thead" ) {
+      for ( const auto& row : child.children ) {
+        if ( row.tag_name.starts_with( "tr" ) ) {
+          process_table_row_widths( row, widths );
+        }
+      }
+    }
+  }
+  for ( auto& w : widths ) {
+    w = std::min<std::size_t>( w, 30 );
+  }
+  return widths;
+}
+
+void render_table_row( const parser::DomNode& row,
+                       RenderResult& result,
+                       const FormContext& ctx,
+                       const std::vector<std::size_t>& widths )
+{
+  std::string& output = result.text;
+  output += "\033[90m|\033[0m ";
+  std::size_t col_idx = 0;
+  for ( const auto& cell : row.children ) {
+    const std::size_t cell_space = cell.tag_name.find( ' ' );
+    const std::string c_tag
+      = ( cell_space == std::string::npos ) ? cell.tag_name : cell.tag_name.substr( 0, cell_space );
+    if ( c_tag != "td" && c_tag != "th" ) {
+      continue;
+    }
+
+    const std::size_t text_start = output.size();
+    if ( c_tag == "th" ) {
+      output += "\033[1;36m";
+    }
+
+    for ( const auto& cell_child : cell.children ) {
+      render_node( cell_child, result, ctx );
+    }
+
+    if ( c_tag == "th" ) {
+      output += "\033[0m";
+    }
+
+    const std::string added = output.substr( text_start );
+    const std::size_t vis_len = get_visible_length( added );
+    const std::size_t tw = ( col_idx < widths.size() ) ? widths[col_idx] : 10;
+
+    if ( vis_len < tw ) {
+      output.append( tw - vis_len, ' ' );
+    }
+    output += " \033[90m|\033[0m ";
+    col_idx++;
+  }
+  output += "\n";
+}
+
+} // namespace
+
+void render_table( const parser::DomNode& node, RenderResult& result, const FormContext& ctx )
+{
+  std::string& output = result.text;
+  const std::vector<std::size_t> widths = calc_table_widths( node );
+
+  output += "\n\033[90m+" + std::string( 78, '-' ) + "+\033[0m\n";
+
+  for ( const auto& child : node.children ) {
+    const std::size_t child_space = child.tag_name.find( ' ' );
+    const std::string child_tag
+      = ( child_space == std::string::npos ) ? child.tag_name : child.tag_name.substr( 0, child_space );
+    if ( child_tag == "tr" ) {
+      render_table_row( child, result, ctx, widths );
+    } else if ( child_tag == "tbody" || child_tag == "thead" ) {
+      for ( const auto& row : child.children ) {
+        if ( row.tag_name.starts_with( "tr" ) ) {
+          render_table_row( row, result, ctx, widths );
+        }
+      }
+    }
+  }
+  output += "\033[90m+" + std::string( 78, '-' ) + "+\033[0m\n";
+}
+
+} // namespace ricochet::render
diff --git a/src/render/utils.cc b/src/render/utils.cc
new file mode 100644
index 0000000..9c6610a
--- /dev/null
+++ b/src/render/utils.cc
@@ -0,0 +1,135 @@
+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "ricochet/render/utils.hh"
+
+#include <array>
+#include <cstdint>
+#include <stdexcept>
+
+namespace ricochet::render {
+
+std::string decode_entities( std::string text )
+{
+  constexpr std::array<std::pair<std::string_view, std::string_view>, 25> entities
+    = { { { "&nbsp;", " " },   { "&lt;", "<" },     { "&gt;", ">" },     { "&amp;", "&" },   { "&quot;", "\"" },
+          { "&apos;", "'" },   { "&copy;", "©" },   { "&reg;", "®" },    { "&trade;", "™" }, { "&euro;", "€" },
+          { "&pound;", "£" },  { "&yen;", "¥" },    { "&cent;", "¢" },   { "&sect;", "§" },  { "&para;", "¶" },
+          { "&hellip;", "…" }, { "&dagger;", "†" }, { "&Dagger;", "‡" }, { "&bull;", "•" },  { "&prime;", "′" },
+          { "&Prime;", "″" },  { "&lsaquo;", "‹" }, { "&rsaquo;", "›" }, { "&oline;", "‾" }, { "&frasl;", "⁄" } } };
+
+  for ( const auto& [entity, replacement] : entities ) {
+    std::size_t pos = 0;
+    while ( ( pos = text.find( entity, pos ) ) != std::string::npos ) {
+      text.replace( pos, entity.length(), replacement );
+      pos += replacement.length();
+    }
+  }
+
+  std::size_t pos = 0;
+  while ( ( pos = text.find( "&#", pos ) ) != std::string::npos ) {
+    const std::size_t end = text.find( ';', pos );
+    if ( end != std::string::npos && end - pos < 10 ) {
+      const std::string code = text.substr( pos + 2, end - pos - 2 );
+      try {
+        std::uint32_t cp = 0;
+        if ( !code.empty() && ( code[0] == 'x' || code[0] == 'X' ) ) {
+          cp = std::stoul( code.substr( 1 ), nullptr, 16 );
+        } else {
+          cp = std::stoul( code );
+        }
+        if ( cp < 128 ) {
+          text.replace( pos, end - pos + 1, 1, static_cast<char>( cp ) );
+          continue;
+        }
+      } catch ( const std::invalid_argument& ) {
+        (void)0;
+      } catch ( const std::out_of_range& ) {
+        (void)0;
+      }
+    }
+    pos++;
+  }
+  return text;
+}
+
+std::string extract_attr( const std::string& tag_name, std::string_view attr_name )
+{
+  std::string match = " " + std::string( attr_name ) + "=";
+  std::size_t pos = tag_name.find( match );
+
+  if ( pos == std::string::npos ) {
+    match = std::string( attr_name ) + "=";
+    if ( !tag_name.starts_with( match ) ) {
+      return "";
+    }
+    pos = 0;
+  } else {
+    pos += 1;
+  }
+
+  pos += attr_name.length() + 1;
+  if ( pos >= tag_name.length() ) {
+    return "";
+  }
+
+  const char quote = tag_name[pos];
+  if ( quote == '"' || quote == '\'' ) {
+    const std::size_t end = tag_name.find( quote, pos + 1 );
+    if ( end != std::string::npos ) {
+      return tag_name.substr( pos + 1, end - pos - 1 );
+    }
+    return "";
+  }
+
+  const std::size_t end = tag_name.find_first_of( " >/", pos );
+  return tag_name.substr( pos, ( end == std::string::npos ) ? std::string::npos : end - pos );
+}
+
+std::size_t get_visible_length( std::string_view str )
+{
+  std::size_t len = 0;
+  bool in_ansi = false;
+  for ( std::size_t i = 0; i < str.length(); ++i ) {
+    const auto c = static_cast<unsigned char>( str[i] );
+    if ( c == 0x1B ) {
+      in_ansi = true;
+    } else if ( in_ansi && c == 'm' ) {
+      in_ansi = false;
+    } else if ( !in_ansi ) {
+      if ( ( c & 0x80 ) == 0 || ( c & 0xE0 ) == 0xC0 ) {
+        len += 1;
+      } else if ( ( c & 0xF0 ) == 0xE0 || ( c & 0xF8 ) == 0xF0 ) {
+        len += 2;
+      }
+    }
+  }
+  return len;
+}
+
+bool is_ignored_tag( std::string_view tag )
+{
+  return tag == "head" || tag == "style" || tag == "script" || tag == "meta" || tag == "title" || tag == "link";
+}
+
+bool is_heading_tag( std::string_view tag )
+{
+  return tag == "h1" || tag == "h2" || tag == "h3" || tag == "h4";
+}
+
+} // namespace ricochet::render