[enhance] support C++

lib/erubis/engine/ecpp.rb

@@ -0,0 +1,113 @@
+##
+## $Release:$
+## $Copyright$
+##
+
+require 'erubis/engine'
+require 'erubis/enhancer'
+
+
+module Erubis
+
+
+  module CppGenerator
+    include Generator
+
+    def self.supported_properties()  # :nodoc:
+      return [
+              [:indent, '',       "indent spaces (ex. '  ')"],
+              [:bufvar, '_buf',   "buffer variable name"],
+            ]
+    end
+
+    def init_generator(properties={})
+      super
+      @escapefunc ||= "escape"
+      @indent = properties[:indent] || ''
+      @bufvar = properties[:bufvar] || '_buf'
+    end
+
+    def add_preamble(src)
+      src << "#line 1 \"#{self.filename}\"\n" if self.filename
+    end
+
+    def escape_text(text)
+      @@table_ ||= { "\r"=>"\\r", "\n"=>"\\n", "\t"=>"\\t", '"'=>'\\"', "\\"=>"\\\\" }
+      text.gsub!(/[\r\n\t"\\]/) { |m| @@table_[m] }
+      return text
+    end
+
+    def escaped_expr(code)
+      return "#{@escapefunc}(#{code.strip})"
+    end
+
+    def add_text(src, text)
+      return if text.empty?
+      src << (src.empty? || src[-1] == ?\n ? @indent : ' ')
+      src << "_buf << "
+      i = 0
+      text.each_line do |line|
+        src << "\n" << @indent << "        " if i > 0
+        i += 1
+        src << '"' << escape_text(line) << '"'
+      end
+      src << ";"   #<< (text[-1] == ?\n ? "\n" : "")
+      src << "\n" if text[-1] == ?\n
+    end
+
+    def add_stmt(src, code)
+      src << code
+    end
+
+    def add_expr_literal(src, code)
+      src << @indent if src.empty? || src[-1] == ?\n
+      src << " _buf << (" << code.strip << ");"
+    end
+
+    def add_expr_escaped(src, code)
+      src << @indent if src.empty? || src[-1] == ?\n
+      src << ' ' << escaped_expr(code) << ';'
+    end
+
+    def add_expr_debug(src, code)
+      code.strip!
+      src << @indent if src.empty? || src[-1] == ?\n
+      src << " std::cerr << \"*** debug: #{code.gsub(/(")/, '\\\&')}=\" << (#{code});"
+    end
+
+    def add_postamble(src)
+      # empty
+    end
+
+  end
+
+
+  ##
+  ## engine for C
+  ##
+  class Ecpp < Basic::Engine
+    include CppGenerator
+  end
+
+
+  class EscapedEcpp < Ecpp
+    include EscapeEnhancer
+  end
+
+
+  #class XmlEcpp < Ecpp
+  #  include EscapeEnhancer
+  #end
+
+  class PI::Ecpp < PI::Engine
+    include CppGenerator
+
+    def init_converter(properties={})
+      @pi = 'cpp'
+      super(properties)
+    end
+
+  end
+
+
+end

lib/erubis/main.rb

@@ -11,6 +11,7 @@
 require 'erubis/engine/eruby'
 require 'erubis/engine/ephp'
 require 'erubis/engine/ec'
+require 'erubis/engine/ecpp'
 require 'erubis/engine/ejava'
 require 'erubis/engine/escheme'
 require 'erubis/engine/eperl'
@@ -231,7 +232,7 @@ def usage(command=nil)
       buf << "  -z            : syntax checking"
       buf << "  -e            : escape (equal to '--E Escape')"
       buf << "  -p pattern    : embedded pattern (default '<% %>')"
-      buf << "  -l lang       : convert but no execute (ruby/php/c/java/scheme/perl/js)"
+      buf << "  -l lang       : convert but no execute (ruby/php/c/cpp/java/scheme/perl/js)"
       buf << "  -E e1,e2,...  : enhancer names (Escape, PercentLine, BiPattern, ...)"
       buf << "  -I path       : library include path"
       buf << "  -K kanji      : kanji code (euc/sjis/utf8) (default none)"
@@ -269,7 +270,7 @@ def show_properties
       list << ['(common)', common_props]
       list << ['(basic)',  basic_props - common_props]
       list << ['(pi)',     pi_props    - common_props]
-      %w[ruby php c java scheme perl javascript].each do |lang|
+      %w[ruby php c cpp java scheme perl javascript].each do |lang|
         klass = Erubis.const_get("E#{lang}")
         list << [lang, collect_supported_properties(klass) - basic_props]
       end

test/test-engines.rb

@@ -9,6 +9,7 @@
 require 'erubis/engine/eruby'
 require 'erubis/engine/ephp'
 require 'erubis/engine/ec'
+require 'erubis/engine/ecpp'
 require 'erubis/engine/ejava'
 require 'erubis/engine/escheme'
 require 'erubis/engine/eperl'
@@ -163,6 +164,36 @@ def _test()
               "</table>\n", stdout);
          fprintf(stderr, "*** debug: i=" "%d", i); fputs("\n", stdout);
 ##
+- name:  cpp1
+  lang:  cpp
+  class: Ecpp
+  options: { :filename: foo.html, :indent: '  ' }
+  input: |4
+      <table>
+       <tbody>
+      <%  for (i = 0; i < n; i++) { %>
+        <tr>
+         <td><%= i %></td>
+         <td><%== list[i] %></td>
+        </tr>
+      <%  } %>
+       </tbody>
+      </table>
+      <%=== i %>
+  expected: |
+      #line 1 "foo.html"
+        _buf << "<table>\n"
+                " <tbody>\n";
+        for (i = 0; i < n; i++) { 
+        _buf << "  <tr>\n"
+                "   <td>"; _buf << (i); _buf << "</td>\n"
+                "   <td>"; escape(list[i]); _buf << "</td>\n"
+                "  </tr>\n";
+        } 
+        _buf << " </tbody>\n"
+                "</table>\n";
+         std::cerr << "*** debug: i=" << (i); _buf << "\n";
+##
 - name:  java1
   lang:  java
   class: Ejava