[antlr-interest] Hi, is there anybody tell me how to get parse tree?

[=?GB2312?B?0MLC8g==?=]

as (1+2) + 3
parse tree will include the "(" token, which will be ignore in AST.
so the expression (1+2) has 5 leaf : ( , 1, + , 2,  ).

for I wanna make an IDE, so locating source code is necessary, is there
anybody tell me about it?
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