Question

我修改了[Porcelli]（https://github.com/porcelli/plsql-parser）给出的PLSQL解析器。我正在使用此解析器来解析PlSql文件。我在解析FOR循环语句时面临问题，例如

for i in 1..l_line_tbl.count
LOOP
l_line_tbl(i).schedule_ship_date := l_max_ship_date;
l_line_tbl(i).ship_set_id := x_ship_set_id;
END LOOP;

上面的语句没有解析它抛出EarlyExitException。

现在，如果我修改此语句并在1和双点（..）之间放置一个空格，它将解析该语句。我不知道如何处理第一个案件。

for i in 1 ..l_line_tbl.count
LOOP
l_line_tbl(i).schedule_ship_date := l_max_ship_date;
l_line_tbl(i).ship_set_id := x_ship_set_id;
END LOOP;

Parser Grammar：

loop_statement
@init    {    int mode = 0;    } 
:    label_name?
    (while_key condition {mode = 1;} | for_key cursor_loop_param {mode = 2;})?
    loop_key
    seq_of_statements
    end_key loop_key label_name?
    -> {mode == 1}? ^(WHILE_LOOP[$while_key.start] label_name* 
    ^(LOGIC_EXPR condition) seq_of_statements)
    -> {mode == 2}? ^(FOR_LOOP[$for_key.start] label_name* cursor_loop_param seq_of_statements)
    -> ^(loop_key label_name* seq_of_statements)
;

// $<Loop - Specific Clause

cursor_loop_param
@init    {    int mode = 0;    }
:    (index_name in_key reverse_key? lower_bound DOUBLE_PERIOD)=> 
        index_name in_key reverse_key? lower_bound DOUBLE_PERIOD upper_bound
    -> ^(INDEXED_FOR index_name reverse_key? ^(SIMPLE_BOUND lower_bound upper_bound))
|     record_name in_key ( cursor_name expression_list? {mode = 1;} | LEFT_PAREN 
select_statement RIGHT_PAREN)
    ->{mode == 1}? ^(CURSOR_BASED_FOR record_name cursor_name expression_list?)
    -> ^(SELECT_BASED_FOR record_name select_statement)
;

// $＆gt;

Lexer Grammar：

FOR_NOTATION
:    UNSIGNED_INTEGER
    {state.type = UNSIGNED_INTEGER; emit(); advanceInput();}
    '..'
    {state.type = DOUBLE_PERIOD; emit(); advanceInput();}
    UNSIGNED_INTEGER
    {state.type = UNSIGNED_INTEGER; emit(); advanceInput(); $channel=HIDDEN;}
;

fragment
UNSIGNED_INTEGER
:    ('0'..'9')+ 
;

使用基于ANTLR的PLSQL解析器解析FOR循环

0 个答案: