Add smartsign feature like smartcase

Now, you can jump to '!' by '1'.
Option: keyboard layout
    g:EasyMotion_use_smartsign_us
    g:EasyMotion_use_smartsign_jp

autoload/EasyMotion.vim

@@ -339,7 +339,7 @@ endfunction "}}}
 
 	function! s:findMotion(char) "{{{
 		" Find Motion: S,F,T
-		let re = escape(a:char, '.$^~')
+		let re = escape(a:char, '.$^~\')
 
 		if g:EasyMotion_use_migemo
 			let re = s:convertMigemo(re)
@@ -362,12 +362,43 @@ endfunction "}}}
 		return re
 	endfunction "}}}
 	function! s:convertSmartcase(re, char) "{{{
-		if a:char =~# '\v\U'
+		let re = a:re
-			let re = '\c' . a:re
+		if a:char =~# '\U' "nonuppercase
-		else
+			if s:useSmartsign()
-			let re = '\C' . a:re
+				let re = s:convertSmartsign(a:re, a:char)
+			endif
+
+			return '\c' . re
+		else "uppercase
+			return '\C' . re
+		endif
+	endfunction "}}}
+	function! s:convertSmartsign(re, char) "{{{
+		let smart_dict = s:load_smart_dict()
+		let upper_sign = escape(get(smart_dict, a:char, ''), '.$^~')
+		if upper_sign ==# ''
+			return a:re
+		else
+			let re = a:re . '\|' . upper_sign
+			return re
+		endif
+	endfunction "}}}
+	function! s:useSmartsign() "{{{
+		if exists('g:EasyMotion_use_smartsign_us') ||
+		\  exists('g:EasyMotion_use_smartsign_jp')
+			return 1
+		else
+			return 0
+		endif
+	endfunction "}}}
+	function! s:load_smart_dict() "{{{
+		if exists('g:EasyMotion_use_smartsign_us')
+			return g:EasyMotion#sticky_table#us
+		elseif exists('g:EasyMotion_use_smartsign_jp')
+			return g:EasyMotion#sticky_table#jp
+		else
+			return ''
 		endif
-		return re
 	endfunction "}}}
 
 " }}}

autoload/EasyMotion/sticky_table.vim

@@ -0,0 +1,23 @@
+" Saving 'cpoptions' {{{
+let s:save_cpo = &cpo
+set cpo&vim
+" }}}
+"
+let EasyMotion#sticky_table#us = {
+      \',' : '<', '.' : '>', '/' : '?',
+      \'1' : '!', '2' : '@', '3' : '#', '4' : '$', '5' : '%',
+      \'6' : '^', '7' : '&', '8' : '*', '9' : '(', '0' : ')', '-' : '_', '=' : '+',
+      \';' : ':', '[' : '{', ']' : '}', '`' : '~', "'" : "\"", '\' : '|',
+      \}
+
+let EasyMotion#sticky_table#jp = {
+      \',' : '<', '.' : '>', '/' : '?',
+      \'1' : '!', '2' : '"', '3' : '#', '4' : '$', '5' : '%',
+      \'6' : '&', '7' : "'", '8' : '(', '9' : ')', '0' : '_', '-' : '=', '^' : '~',
+      \';' : '+', ':' : '*', '[' : '{', ']' : '}', '@' : '`', '\' : '|',
+      \}
+
+" Restore 'cpoptions' {{{
+let &cpo = s:save_cpo
+unlet s:save_cpo
+" }}}