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|
module CodeRay module Scanners
# HTML Scanner
#
# $Id$
class HTML < Scanner
include Streamable
register_for :html
ATTR_NAME = /[\w.:-]+/
ATTR_VALUE_UNQUOTED = ATTR_NAME
TAG_END = /\/?>/
HEX = /[0-9a-fA-F]/
ENTITY = /
&
(?:
\w+
|
\#
(?:
\d+
|
x#{HEX}+
)
)
;
/ox
PLAIN_STRING_CONTENT = {
"'" => /[^&'>\n]+/,
'"' => /[^&">\n]+/,
}
private
def setup
@state = :initial
@plain_string_content = nil
end
def scan_tokens tokens, options
state = @state
plain_string_content = @plain_string_content
until eos?
kind = :error
match = nil
if scan(/\s+/m)
kind = :space
else
case state
when :initial
if scan(/<!--.*?-->/m)
kind = :comment
elsif scan(/<!DOCTYPE.*?>/m)
kind = :preprocessor
elsif scan(/<\?xml.*?\?>/m)
kind = :preprocessor
elsif scan(/<\?.*?\?>|<%.*?%>/m)
kind = :comment
elsif scan(/<\/[-\w_.:]*>/m)
kind = :tag
elsif match = scan(/<[-\w_.:]*>?/m)
kind = :tag
state = :attribute unless match[-1] == ?>
elsif scan(/[^<>&]+/)
kind = :plain
elsif scan(/#{ENTITY}/ox)
kind = :entity
elsif scan(/>/)
kind = :error
else
raise_inspect '[BUG] else-case reached with state %p' % [state], tokens
end
when :attribute
if scan(/#{TAG_END}/)
kind = :tag
state = :initial
elsif scan(/#{ATTR_NAME}/o)
kind = :attribute_name
state = :attribute_equal
else
getch
end
when :attribute_equal
if scan(/=/)
kind = :operator
state = :attribute_value
elsif scan(/#{ATTR_NAME}/o)
kind = :attribute_name
elsif scan(/#{TAG_END}/o)
kind = :tag
state = :initial
elsif scan(/./)
state = :attribute
end
when :attribute_value
if scan(/#{ATTR_VALUE_UNQUOTED}/o)
kind = :attribute_value
state = :attribute
elsif match = scan(/["']/)
tokens << [:open, :string]
state = :attribute_value_string
plain_string_content = PLAIN_STRING_CONTENT[match]
kind = :delimiter
elsif scan(/#{TAG_END}/o)
kind = :tag
state = :initial
else
getch
end
when :attribute_value_string
if scan(plain_string_content)
kind = :content
elsif scan(/['"]/)
tokens << [matched, :delimiter]
tokens << [:close, :string]
state = :attribute
next
elsif scan(/#{ENTITY}/ox)
kind = :entity
elsif match(/[\n>]/)
tokens << [:close, :string]
kind = error
state = :initial
end
else
raise_inspect 'Unknown state: %p' % [state], tokens
end
end
match ||= matched
if $DEBUG and (not kind or kind == :error)
raise_inspect 'Error token %p in line %d' %
[[match, kind], line], tokens
end
raise_inspect 'Empty token', tokens unless match
tokens << [match, kind]
end
if options[:keep_state]
@state = state
@plain_string_content = plain_string_content
end
tokens
end
end
end end
|
