獲取文字的行嗎？

Question

有沒有獲得_LITERAL_NAMES行和位置的方法？

例如：

constant returns [String typeS, int line, int pos] 
    : sign number {$typeS = "integer"; $line = $number.line; $pos = $number.pos;} 
    | 'true'  {$typeS = "boolean"; $line = ????; $pos = ????} 
    | 'false'  {$typeS = "boolean"; $line = ????; $pos = ????} 
    ; 

Answer 1

試試這個：

constant returns [String typeS, int line, int pos] 
: sign number {$typeS = "integer"; $line = $number.line; $pos = $number.pos;} 
| t='true' {$typeS = "boolean"; $line = $t.line; $pos = $t.pos;} 
| t='false' {$typeS = "boolean"; $line = $t.line; $pos = $t.pos;} 
;