Class: Kwartz::PerlHandler

Inherits:
Handler
  • Object
show all
Includes:
PerlExpressionParser
Defined in:
lib/kwartz/binding/perl.rb

Overview

directive handler for Perl

Constant Summary collapse

PERL_DIRECTIVE_PATTERN = 
/\A(\w+)(?:\s*\(\s*(.*)\))?\z/
PERL_MAPPING_PATTERN = 
/\A'([-:\w]+)',\s*(.*)\z/
PERL_DIRECTIVE_FORMAT = 
'%s(%s)'

Instance Attribute Summary

Attributes inherited from Handler

#even, #filename, #odd

Instance Method Summary collapse

Methods included from PerlExpressionParser

#parse_expr_str, #parse_expr_str!

Methods inherited from Handler

#_elem_info_table, #_import_element_info_from_handler, #apply_rulesets, #extract, get_class, #get_element_info, #get_ruleset, #handle_directives, #initialize, register_class, #register_element_info

Methods included from Expander

#expand_element_info, #expand_statement, #expand_statements, #get_element_info, #get_ruleset

Methods included from Assertion

assert

Methods included from HandlerHelper

#_last_stmt_kind, #add_foreach_stmts, #add_native_code, #add_native_expr_with_default, #build_print_args, #build_print_expr_stmt, #build_print_stmt, #create_text_print_stmt, #error_if_empty_tag, #error_when_last_stmt_is_not_if, #etag_stmt, #expand_attr_vars, #expand_attr_vars_in_native_expr, #expand_attr_vars_in_native_stmt, #stag_stmt, #wrap_content_with_native_stmt, #wrap_element_with_native_stmt

Methods included from ConvertErrorHelper

#convert_error

Constructor Details

This class inherits a constructor from Kwartz::Handler

Instance Method Details

#directive_format ⇒ Object 



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# File 'lib/kwartz/binding/perl.rb', line 76

def directive_format
  return PERL_DIRECTIVE_FORMAT
end

#directive_pattern ⇒ Object 



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# File 'lib/kwartz/binding/perl.rb', line 62

def directive_pattern
  return PERL_DIRECTIVE_PATTERN
end

#handle(directive, elem_info, stmt_list) ⇒ Object 



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# File 'lib/kwartz/binding/perl.rb', line 81

def handle(directive, elem_info, stmt_list)
  ret = super
  return ret if ret

  d_name = directive.name
  d_arg  = directive.arg
  d_str  = directive.str
  e = elem_info

  case d_name

  when :for, :For, :FOR, :list, :List, :LIST
    unless d_arg =~ /\A(\w+)(?:,\s*(\w+))?\s+in\s+(.*)\z/  \
        || d_arg =~ /\A(\w+)(?:,(\w+))?\s*[:=]\s*(.*)\z/
      raise convert_error("'#{d_str}': invalid argument.", e.stag_info.linenum)
    end
    loopvar = $1 ;  loopval = $2 ;  looplist = $3
    is_foreach = d_name == :for || d_name == :For || d_name == :FOR
    counter = d_name == :for || d_name == :list ? nil : "#{loopvar}_ctr"
    toggle  = d_name != :FOR && d_name != :LIST ? nil : "#{loopvar}_tgl"
    foreach_code = loopval ? "#{looplist}.each do |#{loopvar}, #{loopval}|" \
                           : "for #{loopvar} in #{looplist} do"
    code = []
    code << "#{counter} = 0" if counter
    code << foreach_code
    code << "  #{counter} += 1" if counter
    code << "  #{toggle} = #{counter}%2==0 ? #{@even} : #{@odd}" if toggle
    if is_foreach
      wrap_element_with_native_stmt(elem_info, stmt_list, code, "end", :foreach)
    else
      wrap_content_with_native_stmt(elem_info, stmt_list, code, "end", :foreach)
    end

  when :while
    wrap_element_with_native_stmt(elem_info, stmt_list, "while #{d_arg} do", "end", :while)
    #stmt_list << NativeStatement.new("while #{d_arg} do", :while)
    #stmt_list << stag_stmt(elem_info)
    #stmt_list.concat(e.cont_stmts)
    #stmt_list << etag_stmt(elem_info)
    #stmt_list << NativeStatement.new("end", :while)

  when :loop
    error_if_empty_tag(elem_info, d_str)
    wrap_content_with_native_stmt(elem_info, stmt_list, "while #{d_arg} do", "end", :while)
    #stmt_list << stag_stmt(elem_info)
    #stmt_list << NativeStatement.new("while #{d_arg} do", :while)
    #stmt_list.concat(e.cont_stmts)
    #stmt_list << NativeStatement.new("end", :while)
    #stmt_list << etag_stmt(elem_info)

  when :set
    wrap_element_with_native_stmt(elem_info, stmt_list, d_arg, nil, :set)
    #stmt_list << NativeStatement.new(d_arg, :set)
    #stmt_list << stag_stmt(elem_info)
    #stmt_list.concat(e.cont_stmts)
    #stmt_list << etag_stmt(elem_info)

  when :if
    wrap_element_with_native_stmt(elem_info, stmt_list, "if #{d_arg} then", "end", :if)
    #stmt_list << NativeStatement.new("if #{d_arg} then", :if)
    #stmt_list << stag_stmt(elem_info)
    #stmt_list.concat(e.cont_stmts)
    #stmt_list << etag_stmt(elem_info)
    #stmt_list << NativeStatement.new("end", :if)

  when :elsif, :else
    error_when_last_stmt_is_not_if(elem_info, d_str, stmt_list)
    stmt_list.pop    # delete 'end'
    kind = d_name == :else ? :else : :elseif
    code = d_name == :else ? "else" : "elsif #{d_arg} then"
    wrap_element_with_native_stmt(elem_info, stmt_list, code, "end", kind)
    #stmt_list << NativeStatement.new(code, kind)
    #stmt_list << stag_stmt(elem_info)
    #stmt_list.concat(e.cont_stmts)
    #stmt_list << etag_stmt(elem_info)
    #stmt_list << NativeStatement.new("end", kind)

  when :default, :Default, :DEFAULT
    error_if_empty_tag(elem_info, d_str)
    expr_str = directive.dattr == 'id' ? parse_expr_str(d_arg, e.stag_info.linenum) : d_arg
    flag_escape = d_name == :default ? nil : (d_name == :Default)
    add_native_expr_with_default(elem_info, stmt_list, expr_str, flag_escape,
                                 "if (#{expr_str}) && !(#{d_arg}).to_s.empty? then",
                                 "else", "end")
    #stmt_list << stag_stmt(elem_info)
    #stmt_list << NativeStatement.new_without_newline("if (#{d_arg}) && !(#{d_arg}).to_s.empty? then", :if)
    #flag_escape = d_name == :default ? nil : (d_name == :Default)
    #stmt_list << PrintStatement.new([ NativeExpression.new(d_arg, flag_escape) ])
    #stmt_list << NativeStatement.new_without_newline("else", :else)
    #stmt_list.concat(e.cont_stmts)
    #stmt_list << NativeStatement.new_without_newline("end", :else)
    #stmt_list << etag_stmt(elem_info)

  else
    return false

  end #case
  return true

end

#mapping_pattern ⇒ Object 



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# File 'lib/kwartz/binding/perl.rb', line 69

def mapping_pattern
  return PERL_MAPPING_PATTERN
end