@@ -98,6 +98,8 @@ mod html {
9898 pub enum Token {
9999 Plain ( String ) ,
100100 Bold ( String ) ,
101+ Sup ( String ) ,
102+ Sub ( String ) ,
101103 Eof ( String ) ,
102104 }
103105
@@ -107,6 +109,61 @@ mod html {
107109 fn render ( & self ) -> String ;
108110 }
109111
112+ pub fn superscript ( n : u8 ) -> String {
113+ if n == 0 {
114+ "0" . to_owned ( )
115+ } else if n == 1 {
116+ "1" . to_owned ( )
117+ } else if n == 2 {
118+ "2" . to_owned ( )
119+ } else if n == 3 {
120+ "3" . to_owned ( )
121+ } else if n == 4 {
122+ "4" . to_owned ( )
123+ } else if n == 5 {
124+ "5" . to_owned ( )
125+ } else if n == 6 {
126+ "6" . to_owned ( )
127+ } else if n == 7 {
128+ "7" . to_owned ( )
129+ } else if n == 8 {
130+ "8" . to_owned ( )
131+ } else if n == 9 {
132+ "9" . to_owned ( )
133+ } else if n >= 10 {
134+ superscript ( n / 10 ) + & superscript ( n % 10 )
135+ } else {
136+ n. to_string ( )
137+ }
138+ }
139+ 140+ pub fn subscript ( n : u8 ) -> String {
141+ if n >= 10 {
142+ subscript ( n / 10 ) + & subscript ( n % 10 )
143+ } else if n == 0 {
144+ "0" . to_owned ( )
145+ } else if n == 1 {
146+ "1" . to_owned ( )
147+ } else if n == 2 {
148+ "2" . to_owned ( )
149+ } else if n == 3 {
150+ "3" . to_owned ( )
151+ } else if n == 4 {
152+ "4" . to_owned ( )
153+ } else if n == 5 {
154+ "5" . to_owned ( )
155+ } else if n == 6 {
156+ "6" . to_owned ( )
157+ } else if n == 7 {
158+ "7" . to_owned ( )
159+ } else if n == 8 {
160+ "8" . to_owned ( )
161+ } else if n == 9 {
162+ "9" . to_owned ( )
163+ } else {
164+ n. to_string ( )
165+ }
166+ }
110167 impl HTML for String {
111168 fn ser ( & self ) -> Vec < Token > {
112169 // empty tags
@@ -117,12 +174,20 @@ mod html {
117174 let mut ptr = 0 ;
118175 let mut output = vec ! [ ] ;
119176 let mut bold = false ;
177+ let mut sup = false ;
178+ let mut sub = false ;
120179 for ( i, e) in tks. chars ( ) . enumerate ( ) {
121180 match e {
122181 '<' => {
123182 if bold {
124183 output. push ( Token :: Bold ( tks[ ptr..i] . to_string ( ) ) ) ;
125184 bold = false ;
185+ } else if sup {
186+ output. push ( Token :: Sup ( tks[ ptr..i] . to_string ( ) ) ) ;
187+ sup = false ;
188+ } else if sub {
189+ output. push ( Token :: Sub ( tks[ ptr..i] . to_string ( ) ) ) ;
190+ sub = false ;
126191 } else {
127192 output. push ( Token :: Plain ( tks[ ptr..i] . to_string ( ) ) ) ;
128193 }
@@ -133,6 +198,8 @@ mod html {
133198 "-" => continue ,
134199 _ => match & tks[ ( ptr + 1 ) ..i] {
135200 "b" | "strong" => bold = true ,
201+ "sup" => sup = true ,
202+ "sub" => sub = true ,
136203 _ => { }
137204 } ,
138205 }
@@ -168,6 +235,14 @@ mod html {
168235
169236 tks. push ( s. bold ( ) . to_string ( ) ) ;
170237 }
238+ Token :: Sup ( s) => tks. push ( match s. parse :: < u8 > ( ) {
239+ Ok ( n) => superscript ( n) ,
240+ _ => s,
241+ } ) ,
242+ Token :: Sub ( s) => tks. push ( match s. parse :: < u8 > ( ) {
243+ Ok ( n) => subscript ( n) ,
244+ _ => s,
245+ } ) ,
171246 Token :: Eof ( s) => tks. push ( s. normal ( ) . to_string ( ) ) ,
172247 }
173248 }
0 commit comments