From 29c8ce737f513766673fd3e57e30233d9fcce159 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sun, 13 Sep 2009 14:02:04 +0200
Subject: Add C++ source code indenter

---
 cutl/compiler/cxx-indenter.hxx | 169 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 cutl/compiler/cxx-indenter.hxx

(limited to 'cutl/compiler/cxx-indenter.hxx')

diff --git a/cutl/compiler/cxx-indenter.hxx b/cutl/compiler/cxx-indenter.hxx
new file mode 100644
index 0000000..0e5e2a1
--- /dev/null
+++ b/cutl/compiler/cxx-indenter.hxx
@@ -0,0 +1,169 @@
+// file      : cutl/compiler/cxx-indenter.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_COMPILER_CXX_INDENTER_HXX
+#define CUTL_COMPILER_CXX_INDENTER_HXX
+
+#include <set>
+#include <stack>
+#include <string>
+#include <cstddef> // std::size_t
+
+#include <cutl/compiler/code-stream.hxx>
+
+namespace cutl
+{
+  namespace compiler
+  {
+    template <typename C>
+    class cxx_indenter: public code_stream<C>
+    {
+    public:
+      cxx_indenter (code_stream<C>& out);
+
+    private:
+      cxx_indenter (cxx_indenter const&);
+
+      cxx_indenter&
+      operator= (cxx_indenter const&);
+
+    public:
+      virtual void
+      put (C);
+
+      virtual void
+      unbuffer ();
+
+    private:
+      typedef std::basic_string<C> string;
+
+      enum construct
+      {
+        con_other,
+        con_pp_dir,
+        con_c_com,
+        con_cxx_com,
+        con_string_lit,
+        con_char_lit
+      };
+
+    private:
+      void
+      next_token (string const& old, C);
+
+      void
+      ensure_new_line ();
+
+      void
+      output_indentation ();
+
+      void
+      write (C);
+
+    private:
+      void
+      tokenize (C, construct old);
+
+      void
+      retire (C);
+
+    private:
+      enum char_class_type
+      {
+        cc_alpha,   // Alpha + '_'.
+        cc_digit,
+        cc_op_punc, // Operator or punctuation.
+        cc_space
+      };
+
+      static char_class_type
+      char_class (C);
+
+    private:
+      enum keyword_type
+      {
+        kw_if,
+        kw_do,
+        kw_for,
+        kw_else,
+        kw_case,
+        kw_while,
+        kw_catch,
+        kw_default
+      };
+
+      static C const*
+      keyword (keyword_type);
+
+    private:
+      code_stream<C>& out_;
+      bool buffering_;            // True if write() should buffer the char.
+      std::size_t position_;      // Current position on the line.
+      std::size_t paren_balance_; // ( ) balance.
+      std::stack<std::size_t> indentation_;
+      std::size_t spaces_;
+      bool suppress_nl_;
+      construct construct_;
+
+      // Special state stach for the do-while construct. The presence
+      // of an element in the stack indicates that we are in a braced
+      // do-while construct. The value of the element is the brace
+      // balance.
+      std::stack<std::size_t> do_while_state_;
+
+      typedef std::deque<C> hold;
+      hold hold_;
+
+    private:
+      string token_;  // previously fully recognized token
+      string lexeme_; // current lexeme (accumulator)
+
+      // Keywords that may be folowed by a single-line block, e.g., if,
+      // else, etc.
+      //
+      std::set<string> single_line_blocks_;
+
+      // Keywords that may follow (and be related) to a previous block,
+      // e.g., else, case, catch.
+      //
+      std::set<string> follow_blocks_;
+
+      string do_;
+      string lbrace_;
+      string rbrace_;
+
+    private:
+      // Single-line indented blocks such as if, else, while, etc. The
+      // newline flag indicates whether a new line has been seen after
+      // the keyword. This is needed to properly distinguish cases such
+      // as:
+      //
+      // else if (...)
+      //   foo ();
+      //
+      // else
+      //   if (...)
+      //     foo ();
+      //
+      struct indent_block
+      {
+        indent_block (bool newline, bool indented)
+            : newline_ (newline), indented_ (indented)
+        {
+        }
+
+        bool newline_;
+        bool indented_;
+      };
+
+      std::stack<indent_block> indent_stack_;
+    };
+  }
+}
+
+#include <cutl/compiler/cxx-indenter.ixx>
+#include <cutl/compiler/cxx-indenter.txx>
+
+#endif // CUTL_COMPILER_CXX_INDENTER_HXX
-- 
cgit v1.1