Class: Kwartz::JstlHandler

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

Overview

directive handler for JSTL

Direct Known Subclasses

StrutsHandler

Constant Summary collapse

JSTL_DIRECTIVE_PATTERN = 
/\A(\w+)(?:\s*\(\s*(.*)\))?\z/
JSTL_MAPPING_PATTERN = 
/\A'([-:\w]+)',\s*(.*)\z/
JSTL_DIRECTIVE_FORMAT = 
'%s(%s)'

Instance Attribute Summary

Attributes inherited from Handler

#even, #filename, #odd

Instance Method Summary collapse

Methods included from JstlExpressionParser

#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, 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

#initialize(elem_rulesets = [], properties = {}) ⇒ JstlHandler

Returns a new instance of JstlHandler.



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# File 'lib/kwartz/binding/jstl.rb', line 58

def initialize(elem_rulesets=[], properties={})
  super
  @jstl_ver = properties[:jstl] || Config::PROPERTY_JSTL
end

Instance Method Details

#directive_format ⇒ Object 



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# File 'lib/kwartz/binding/jstl.rb', line 80

def directive_format
  return JSTL_DIRECTIVE_FORMAT
end

#directive_pattern ⇒ Object 



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# File 'lib/kwartz/binding/jstl.rb', line 66

def directive_pattern
  return JSTL_DIRECTIVE_PATTERN
end

#handle(directive, elem_info, stmt_list) ⇒ Object 



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# File 'lib/kwartz/binding/jstl.rb', line 85

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
    is_foreach = d_name == :for || d_name == :For || d_name == :FOR
    error_if_empty_tag(elem_info, d_str) unless is_foreach
    unless d_arg =~ /\A(\w+)\s*:\s*(.*)\z/
      raise convert_error("'#{d_str}': invalid argument.", elem_info.stag_info.linenum)
    end
    loopvar = $1 ; looplist = $2
    counter = d_name == :for || d_name == :list ? nil : "#{loopvar}_ctr"
    toggle  = d_name != :FOR && d_name != :LIST ? nil : "#{loopvar}_tgl"
    status  = d_name == :for || d_name == :list ? nil : "#{loopvar}_status"
    foreach_code = "<c:forEach var=\"#{loopvar}\" items=\"${#{looplist}}\""
    foreach_code << " varStatus=\"#{status}\"" if status
    foreach_code << ">"
    code = []
    code << foreach_code
    code << "<c:set var=\"#{counter}\" value=\"${#{status}.count}\"/>" if counter
    if toggle
      if @jstl_ver < 1.2
        code << "<c:choose><c:when test=\"${#{status}.count%2==0}\">"
        code << "<c:set var=\"#{toggle}\" value=\"${self.even}\"/>"
        code << "</c:when><c:otherwise>"
        code << "<c:set var=\"#{toggle}\" value=\"${self.odd}\"/>"
        code << "</c:otherwise></c:choose>"
      else
        code << "<c:set var=\"#{toggle}\" value=\"${#{status}.count%2==0 ? #{self.even} : #{self.odd}}\"/>"
      end
    end
    end_code = "</c:forEach>"
    if is_foreach
      wrap_element_with_native_stmt(elem_info, stmt_list, code, end_code, :set)
    else
      wrap_content_with_native_stmt(elem_info, stmt_list, code, end_code, :set)
    end

  when :while, :loop
    msg = "'#{d_str}': jstl doesn't support '#{d_arg}' directive."
    raise convert_error(msg, elem_info.stag_info.linenum)

  when :set
    unless d_arg =~ /\A(\S+)\s*=\s*(.*)\z/
      raise convert_error("'#{d_str}': invalid argument.", elem_info.stag_info.linenum)
    end
    lhs = $1;  rhs = $2
    code = "<c:set var=\"#{lhs}\" value=\"${#{rhs}}\"/>"
    wrap_element_with_native_stmt(elem_info, stmt_list, code, nil, :set)
    #code = "<c:set var=\"#{lhs}\" value=\"${#{rhs}}\"/>"
    #stmt_list << NativeStatement.new(code, :set)
    #stmt_list << stag_stmt(elem_info)
    #stmt_list.concat(cont_stmts)
    #stmt_list << etag_stmt(elem_info)

  when :if
    start_code = "<c:choose><c:when test=\"${#{d_arg}}\">"
    end_code   = "</c:when></c:choose>"
    wrap_element_with_native_stmt(elem_info, stmt_list, start_code, end_code, :if)
    #stmt_list << NativeStatement.new(start_code, :if)
    #stmt_list << stag_stmt(elem_info)
    #stmt_list.concat(cont_stmts)
    #stmt_list << etag_stmt(elem_info)
    #stmt_list << NativeStatement.new(end, :if)

  when :elseif, :else
    error_when_last_stmt_is_not_if(elem_info, d_str, stmt_list)
    stmt_list.pop    # delete '</c:when></c:choose>'
    if d_name == :else
      kind = :else
      start_code = "</c:when><c:otherwise>"
      end_code   = "</c:otherwise></c:choose>"
    else
      kind = :elseif
      start_code = "</c:when><c:when test=\"${#{d_arg}}\">"
      end_code   = "</c:when></c:choose>"
    end
    wrap_element_with_native_stmt(elem_info, stmt_list, start_code, end_code, kind)
    #stmt_list << NativeStatement.new(start_code, kind)
    #stmt_list << stag_stmt
    #stmt_list.concat(cont_stmts)
    #stmt_list << etag_stmt
    #stmt_list << NativeStatement.new(end_code, kind)

  when :default, :Default, :DEFAULT
    error_if_empty_tag(elem_info, d_str)
    stmt_list << stag_stmt(elem_info)
    flag_escape = d_name == :default ? nil : (d_name == :Default)
    argstr = elem_info.cont_stmts[0].args[0]
    expr_str = directive.dattr == 'id' ? parse_expr_str(d_arg, e.stag_info.linenum) : d_arg
    code =  "<c:out value=\"${#{expr_str}}\""
    code << " escapeXml=\"#{flag_escape}\"" unless flag_escape == nil
    code << " default=\"#{argstr}\"/>"
    stmt_list << NativeStatement.new_without_newline(code)
    stmt_list << etag_stmt(elem_info)

  when :catch
    if d_arg && !d_arg.empty? && d_arg !~ /\A\w+\z/
      raise convert_error("'#{d_str}': invalid varname.", elem_info.stag_info.linenum)
    end
    code = "<c:catch"
    code << " var=\"#{d_arg}\"" if d_arg && !d_arg.empty?
    code << ">"
    stmt_list << NativeStatement.new(code)
    stmt_list.concat(elem_info.cont_stmts)
    stmt_list << NativeStatement.new("</c:catch>")

  when :forEach, :forTokens
    options = eval "{ #{d_arg} }"
    stag, etag = self.__send__ "handle_jstl_#{d_name}", options
    wrap_element_with_native_stmt(elem_info, stmt_list, stag, etag, nil)
    #stmt_list << NativeStatement.new(stag)
    #stmt_list << stag_stmt
    #stmt_list.concat(cont_stmts)
    #stmt_list << etag_stmt
    #stmt_list << NativeStatement.new(etag)

  when :redirect, :import, :url, :remove
    options = eval "{ #{d_arg} }"
    lines = self.__send__ "handle_jstl_#{d_name}", options
    lines.each do |line|
      stmt_list << NativeStatement.new(line.chomp)
    end

  else
    return false

  end #case
  return true

end

#mapping_pattern ⇒ Object 



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# File 'lib/kwartz/binding/jstl.rb', line 73

def mapping_pattern
  return JSTL_MAPPING_PATTERN
end