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|
##
## $Rev$
## $Release$
## $Copyright$
##
require 'abstract'
module Erubis
##
## convert
##
module Converter
attr_accessor :preamble, :postamble, :escape
def self.supported_properties # :nodoc:
return [
[:preamble, nil, "preamble (no preamble when false)"],
[:postamble, nil, "postamble (no postamble when false)"],
[:escape, nil, "escape expression or not in default"],
]
end
def init_converter(properties={})
@preamble = properties[:preamble]
@postamble = properties[:postamble]
@escape = properties[:escape]
end
## convert input string into target language
def convert(input)
codebuf = "" # or []
@preamble.nil? ? add_preamble(codebuf) : (@preamble && (codebuf << @preamble))
convert_input(codebuf, input)
@postamble.nil? ? add_postamble(codebuf) : (@postamble && (codebuf << @postamble))
return codebuf # or codebuf.join()
end
protected
##
## (abstract) convert input to code
##
def convert_input(codebuf, input)
not_implemented
end
end
module Basic
end
##
## basic converter which supports '<% ... %>' notation.
##
module Basic::Converter
include Erubis::Converter
def self.supported_properties # :nodoc:
return [
[:pattern, '<% %>', "embed pattern"],
[:trim, true, "trim spaces around <% ... %>"],
]
end
attr_accessor :pattern, :trim
def init_converter(properties={})
super(properties)
@pattern = properties[:pattern]
@trim = properties[:trim] != false
end
#DEFAULT_REGEXP = /(.*?)(^[ \t]*)?<%(=+|\#)?(.*?)-?%>([ \t]*\r?\n)?/m
DEFAULT_REGEXP = /(^[ \t]*)?<%(=+|\#)?(.*?)-?%>([ \t]*\r?\n)?/m
## return regexp of pattern to parse eRuby script
def pattern_regexp(pattern=@pattern)
if pattern.nil? || pattern == '<% %>'
return DEFAULT_REGEXP
else
prefix, postfix = pattern.split()
#return /(.*?)(^[ \t]*)?#{prefix}(=+|\#)?(.*?)-?#{postfix}([ \t]*\r?\n)?/m
return /(^[ \t]*)?#{prefix}(=+|\#)?(.*?)-?#{postfix}([ \t]*\r?\n)?/m
end
end
protected :pattern_regexp
def convert_input(src, input)
regexp = pattern_regexp(@pattern)
pos = 0
input.scan(regexp) do |lspace, indicator, code, rspace|
match = Regexp.last_match()
len = match.begin(0) - pos
text = input[pos, len]
pos = match.end(0)
add_text(src, text)
## * when '<%= %>', do nothing
## * when '<% %>' or '<%# %>', delete spaces iff only spaces are around '<% %>'
if !indicator # <% %>
if @trim && lspace && rspace
add_stmt(src, "#{lspace}#{code}#{rspace}")
else
add_text(src, lspace) if lspace
add_stmt(src, code)
add_text(src, rspace) if rspace
end
elsif indicator[0] == ?\# # <%# %>
n = code.count("\n") + (rspace ? 1 : 0)
if @trim && lspace && rspace
add_stmt(src, "\n" * n)
else
add_text(src, lspace) if lspace
add_stmt(src, "\n" * n)
add_text(src, rspace) if rspace
end
else # <%= %>
add_text(src, lspace) if lspace
add_expr(src, code, indicator)
add_text(src, rspace) if rspace
end
end
rest = $' || input # add input when no matched
add_text(src, rest)
end
## add expression code to src
def add_expr(src, code, indicator)
case indicator
when '='
@escape ? add_expr_escaped(src, code) : add_expr_literal(src, code)
when '=='
@escape ? add_expr_literal(src, code) : add_expr_escaped(src, code)
when '==='
add_expr_debug(src, code)
end
end
end
module PI
end
##
## Processing Instructions (PI) converter for XML.
## this class converts '<?rb ... ?>' and '${...}' notation.
##
module PI::Converter
include Erubis::Converter
def self.desc # :nodoc:
"use processing instructions (PI) instead of '<% %>'"
end
def self.supported_properties # :nodoc:
return [
[:trim, true, "trim spaces around <% ... %>"],
[:pi, 'rb', "PI (Processing Instrunctions) name"],
[:embchar, '@', "char for embedded expression pattern('@{...}@')"],
[:pattern, '<% %>', "embed pattern"],
]
end
attr_accessor :pi, :prefix
def init_converter(properties={})
super(properties)
@trim = properties[:trim] != false
@pi = properties[:pi] if properties[:pi]
@embchar = properties[:embchar] || '@'
@pattern = properties[:pattern]
@pattern = '<% %>' if @pattern.nil? #|| @pattern == true
end
def convert(input)
code = super(input)
return @header || @footer ? "#{@header}#{code}#{@footer}" : code
end
protected
def convert_input(codebuf, input)
parse_stmts(codebuf, input)
#parse_stmts2(codebuf, input)
end
def parse_stmts(codebuf, input)
#regexp = pattern_regexp(@pattern)
@pi ||= 'e'
@stmt_pattern ||= /(^[ \t]*)?<\?#{@pi}(?:-(\w+))?(\s.*?)\?>([ \t]*\r?\n)?/m
pos = 0
input.scan(@stmt_pattern) do |lspace, pi_arg, code, rspace|
match = Regexp.last_match
len = match.begin(0) - pos
text = input[pos, len]
pos = match.end(0)
parse_exprs(codebuf, text) # unless text.empty?
if @trim && lspace && rspace
add_pi_stmt(codebuf, "#{lspace}#{code}#{rspace}", pi_arg)
else
add_text(codebuf, lspace)
add_pi_stmt(codebuf, code, pi_arg)
add_text(codebuf, rspace)
end
end
rest = $' || input
parse_exprs(codebuf, rest)
end
def parse_exprs(codebuf, input)
unless @expr_pattern
ch = Regexp.escape(@embchar)
if @pattern
left, right = @pattern.split(' ')
@expr_pattern = /#{ch}(!*)?\{(.*?)\}#{ch}|#{left}(=+)(.*?)#{right}/
else
@expr_pattern = /#{ch}(!*)?\{(.*?)\}#{ch}/
end
end
pos = 0
input.scan(@expr_pattern) do |indicator1, code1, indicator2, code2|
indicator = indicator1 || indicator2
code = code1 || code2
match = Regexp.last_match
len = match.begin(0) - pos
text = input[pos, len]
pos = match.end(0)
add_text(codebuf, text) # unless text.empty?
add_pi_expr(codebuf, code, indicator)
end
rest = $' || input
add_text(codebuf, rest)
end
def add_pi_stmt(codebuf, code, pi_arg) # :nodoc:
case pi_arg
when 'header' ; @header = code
when 'footer' ; @footer = code
when 'comment'; add_stmt(codebuf, "\n" * code.count("\n"))
when 'value' ; add_expr_literal(codebuf, code)
else ; add_stmt(codebuf, code)
end
end
def add_pi_expr(codebuf, code, indicator) # :nodoc:
case indicator
when nil, '', '==' # @{...}@ or <%== ... %>
@escape == false ? add_expr_literal(codebuf, code) : add_expr_escaped(codebuf, code)
when '!', '=' # @!{...}@ or <%= ... %>
@escape == false ? add_expr_escaped(codebuf, code) : add_expr_literal(codebuf, code)
when '!!', '===' # @!!{...}@ or <%=== ... %>
add_expr_debug(codebuf, code)
else
# ignore
end
end
## (obsolete) equivarent to parse_stmts(), but a little slower than it.
def parse_stmts2(codebuf, input) # :nodoc:
#regexp = pattern_regexp(@pattern)
@pi ||= 'e'
unless @embedded_pattern
ch = Regexp.escape(@embchar)
if @pattern
left, right = @pattern.split(' ')
@embedded_pattern = /(^[ \t]*)?<\?#{@pi}(?:-(\w+))?(\s.*?)\?>([ \t]*\r?\n)?|#{ch}(!*)?\{(.*?)\}#{ch}|#{left}(=+)(.*?)#{right}/m
else
@embedded_pattern = /(^[ \t]*)?<\?#{@pi}(?:-(\w+))?(\s.*?)\?>([ \t]*\r?\n)?|#{ch}(!*)?\{(.*?)\}#{ch}/m
end
end
pos = 0
input.scan(@embedded_pattern) do |lspace, pi_arg, stmt, rspace,
indicator1, expr1, indicator2, expr2|
match = Regexp.last_match
len = match.begin(0) - pos
text = input[pos, len]
pos = match.end(0)
add_text(codebuf, text) # unless text.empty?
if stmt
code = stmt
if @trim && lspace && rspace
add_pi_stmt(codebuf, "#{lspace}#{code}#{rspace}", pi_arg)
else
add_text(codebuf, lspace)
add_pi_stmt(codebuf, code, pi_arg)
add_text(codebuf, rspace)
end
else
code = expr1 || expr2
indicator = indicator1 || indicator2
add_pi_expr(codebuf, code, indicator)
end
end
rest = $' || input
add_text(codebuf, rest)
end
end
end
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