Class: Oinky::Model::Cpp

Inherits:
Object
  • Object
show all
Defined in:
lib/oinky/cpp_emitter.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(schema) ⇒ Cpp

Returns a new instance of Cpp.



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# File 'lib/oinky/cpp_emitter.rb', line 11

def initialize(schema)
  @schema = Oinky::Model.normalize_schema(schema)
end

Class Method Details

.instance_type_expression(type) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 56

def self.instance_type_expression(type)
  case type
  when :variant
    return 'Oinky::variant_cv_t'
  when :bit
    return 'bool'
  when :datetime
    return 'Oinky::datetime_t'
  when :string 
    return 'Oinky::db_string'
    #int
  when :int8 
    return 'int8_t'
  when :int16
    return 'int16_t'
  when :int32
    return 'int32_t'
  when :int64
    return 'int64_t'
    #uint
  when :uint8 
    return 'uint8_t'
  when :uint16
    return 'uint16_t'
  when :uint32
    return 'uint32_t'
  when :uint64
    return 'uint64_t'
    #float
  when :float32
    return 'float32_t'
  when :float64
    return 'float64_t'
  else
    # This must be a derived type.  It should support this method, to 
    # give us an expression we can use in the target language.
    return type.instance_type(self)
  end
end

.type_code(h) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 143

def self.type_code(h)
  h = h[:type].to_s
  h[0] = h[0].upcase
  return 'column_types::' + h
end

.value_from_variant(src, type) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 99

def self.value_from_variant(src,type)
  case type
  when :variant
    return src
  when :bit
    return "#{src}.bit_value()"
  when :datetime
    return "#{src}.dt_value()"
  when :string 
    return "#{src}.string_value()"
    #int
  when :int8 
    return "(int8_t) #{src}.int_value()"
  when :int16
    return "(int16_t) #{src}.int_value()"
  when :int32
    return "(int32_t) #{src}.int_value()"
  when :int64
    return "#{src}.int_value()"
    #uint
  when :uint8 
    return "(uint8_t) #{src}.uint_value()"
  when :uint16
    return "(uint16_t) #{src}.uint_value()"
  when :uint32
    return "(uint32_t) #{src}.uint_value()"
  when :uint64
    return "#{src}.uint_value()"
    #float
  when :float32
    return "#{src}.f32_value()"
  when :float64
    return "#{src}.f64_value()"

  else
    # This must be a derived type.  It should support this method, to 
    # give us an expression we can use in the target language.
    return type.value_from_variant(src, self)
  end
end

Instance Method Details

#accessor_from_tablename(str) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 22

def accessor_from_tablename(str) ; cppify(str) ; end

#accessor_name(h) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 38

def accessor_name(h)
  return cppify(h[:accessor])
end

#cppify(str) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 15

def cppify(str)
  str.gsub(/($[0-9])|[^a-z0-9A-Z_]/,'_')
end

#default_value_expression(coldef) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 29

def default_value_expression(coldef)
  d = coldef[:default]
  return "#{instance_type_expression(coldef[:type])}()" unless d
  return d.inspect if d.is_a? String
  return d.inspect if d.is_a? Fixnum
  return make_datetime_expression(d) if d.is_a? DateTime
  return d[:cpp]
end

#emit ⇒ Object

Generate a string, containing the C++ code for the model classes.



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# File 'lib/oinky/cpp_emitter.rb', line 164

def emit
  p = Oinky::Detail::Builder.new
  ns = "namespace #{schemaname_to_ns(@schema[:name])}"
  p.next("#{ns} {", "} //#{ns}") {
    p << "using namespace Oinky;"
    p << "using Oinky::Model::TableBase;"
    p << "using Oinky::Model::SchemaBase;"
    p << "using Oinky::db_t;"
    p << ''
    p << "class Schema;"
    tables = @schema[:tables]
    tables.each{|tn, t|
#            struct_hdr = "struct #{tablename_to_groupname(t[:name])}"
#            p << struct_hdr
#            p.next("{", "}; //#{struct_hdr}") {
      tbl_classname = make_table_classname(tn)
      p << ''
      p << "class #{tbl_classname} : public TableBase"
      p.next("{", "}; //class #{tbl_classname}") {
        p << "friend class Schema;"
        p.write("public:", -1)
        p.next("struct Row {", "}; //struct Row") {
          maxw = t[:columns].max_by{|k,col| instance_type_expression(col[:type]).length}
          maxwlen = maxw ? instance_type_expression(maxw[1][:type]).length : 0
          t[:columns].each{|cn,col|
            if col[:description]
              col[:description].split("\n").each{|l|
                p << ("//  " + l)
              }
            end
            # The column name is the default value of the accessor name,
            # but it can be overridden
            p << Kernel.sprintf("%-#{maxwlen}s %s;",
                                instance_type_expression(col[:type]),
                                accessor_name(col))
          }
        }
        p << ''
        p.write("private:", -1)                
        p << "typedef db_t::column_selector_t column_selector_t;"
        p << 'column_selector_t row_selector;'
        # index handles
        indices(t).each {|iname, idef|
          p << "const db_t::index_handle #{accessor_name(idef)};"
        }
        p << ''
        # update_schema
        p << 'static void up_schema(db_t::table_handle th)'
        p.next('{','}') {
          # Add columns
          t[:columns].each{|cn, col|
            p << "TableBase::create_column_if(th, #{cn.inspect}, #{type_code(col)}, #{default_value_expression(col)});"
          }
          # Add indices
          indices(t).each_with_index {|idef,idx|
            iname, idef = idef
            # Column definitions
            names = "idx_column_defs_#{idx}"
            columns = idef[:columns]
            p.next("static index_column_def #{names}[] = {", "};") {
              columns.each_with_index{|col, i|
                colname = index_column_name(col)
                ascending = index_column_ascending(col) ? 'true' : 'false'
                sep = (i == 0 ? '' : ',')
                p << "#{sep} { db_string(\"#{colname}\"), #{ascending} }"
              }
            }
            unique = idef[:unique] ? 'true' : 'false'
            p << "TableBase::create_index_if(th, #{iname.inspect}, #{unique}, #{names}, #{names}+#{columns.size} );"
          }
        }
        p << ''
        p << "template<typename CURSOR>"
        p.next("void priv_row_from_cursor(Row &row, const CURSOR &crs) {", "}") {
          # Don't presume that enumeration with index is a consistent
          # ordering
          indexed_cols = []
          p.next("static const char *column_names[] = {","};") {
            t[:columns].each{|cn, col|
              p << "#{cn.inspect},"
              indexed_cols << col
            }
            p << 'NULL'
          }
          p.next("TableBase::check_init_row_accessor(", "") {
            p << "row_selector, "
            p << "column_names,"
            p << "column_names + #{t[:columns].count}"
            p << ");"
          }
          p.next("variant_cv_t *vals = (variant_cv_t *) ","") {
            p << "alloca(sizeof(variant_cv_t) * #{t[:columns].count});"
          }
          p << "crs.select(row_selector).copy_to(vals, #{t[:columns].count});"
          p << "//  Select values into the target struct"
          indexed_cols.each_with_index{|col,i|
            val = value_from_variant("vals[#{i}]", col[:type])
            p << "row.#{accessor_name(col)} = #{val};"
          }
        } # priv_row_from_cursor              
        p.write("public:", -1)
        # Constructor - initialize index handles.
        p.next("#{tbl_classname}(db_t::table_handle _th, db_t &db) : TableBase(_th, db)","{}") {
          indices(t).each {|iname, idef|
            p << ",#{accessor_name(idef)}(TableBase::get_index_handle(_th, \"#{iname}\"))"
          }
        }
        # Row accessors
        p << ''
        p.next("void row_from_cursor(Row &row, const db_t::index_cursor_handle &crs) {", "}") {
          p << "priv_row_from_cursor(row, crs);"
        }
        p.next("void row_from_cursor(Row &row, const db_t::table_cursor_handle &crs) {", "}") {
          p << "priv_row_from_cursor(row, crs);"
        }
      } # class "#{tbl_classname}"
    } # tables.each {}

    p << ''
    p << "class Schema : public SchemaBase"
    p.next("{","}; //class Schema") {
      p.next("static void up_schema(db_t &db) {","}") {
        tables.each{|tn, t|
          tbl_classname = make_table_classname(tn)
          p << "#{tbl_classname}::up_schema(SchemaBase::get_table_handle(db, #{tn.inspect}));";
        }
      }
      p << ''
      p.write("public:", -1)
      # Table accessors
      tables.each {|tn, tdef|
        tbl_classname = make_table_classname(tn)
        p << "const #{tbl_classname} #{accessor_name(tdef)};"
      }
      p << ''
      p.next("Schema(db_t &db) : SchemaBase(db, &up_schema)","{}") {
        tables.each {|tn, tdef|
          p << ",#{accessor_name(tdef)}(SchemaBase::get_table_handle(db, #{tn.inspect}), db)"
        }              
      }
    }          
  } # namespace <schemaname>
  return p.format
end

#handle_from_tablename(str) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 21

def handle_from_tablename(str) ; "#{cppify(str)}_handle" ; end

#index_column_ascending(col) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 47

def index_column_ascending(col)
  return col[:ascending] if col.is_a? Hash
  # ascending is the default
  return true
end

#index_column_name(col) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 42

def index_column_name(col)
  return col if col.is_a? String
  return col.to_s if col.is_a? Symbol
  return index_column_name(col[:name])
end

#indices(t) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 159

def indices(t)
  t[:indices] || t[:indexes] || []
end

#instance_type_expression(type) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 53

def instance_type_expression(type)
  self.class.instance_type_expression(type)
end

#make_datetime_expression(d) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 24

def make_datetime_expression(d)
  "Oinky::datetime_t::compose(#{d.year-1900},#{d.month - 1},#{d.day - 1}," +
    "#{d.hour},#{d.minute},#{d.second},#{(d.second_fraction * 1000000).to_i})"
end

#make_index_handle_name(idef) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 152

def make_index_handle_name(idef)
  "_idx_handle__#{make_index_name(idef)}"
end

#make_index_name(idef) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 149

def make_index_name(idef)
  cppify(idef[:name])
end

#make_table_classname(tn) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 155

def make_table_classname(tn)
  "CTable_#{cppify(tn)}"
end

#schemaname_to_ns(str) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 19

def schemaname_to_ns(str) ; cppify(str) ; end

#tablename_to_groupname(str) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 20

def tablename_to_groupname(str) ; cppify(str) ; end

#type_code(h) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 140

def type_code(h)
  self.class.type_code(h)
end

#value_from_variant(src, type) ⇒ Object 



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# File 'lib/oinky/cpp_emitter.rb', line 96

def value_from_variant(src,type)
  self.class.value_from_variant(src,type)
end