HAYASHI Kentaro
null+****@clear*****
Fri Mar 29 16:55:15 JST 2013
HAYASHI Kentaro 2013-03-29 16:55:15 +0900 (Fri, 29 Mar 2013) New Revision: d5a11f57e255e0d88a291625f5937b23a51b3161 https://github.com/groonga/groonga/commit/d5a11f57e255e0d88a291625f5937b23a51b3161 Message: doc: add documentation about assignment operators Modified files: doc/source/reference/grn_expr/script_syntax.txt Modified: doc/source/reference/grn_expr/script_syntax.txt (+185 -1) =================================================================== --- doc/source/reference/grn_expr/script_syntax.txt 2013-03-29 14:37:05 +0900 (349aa3d) +++ doc/source/reference/grn_expr/script_syntax.txt 2013-03-29 16:55:15 +0900 (aed75f3) @@ -580,7 +580,191 @@ TODO: ... Assignment operators -------------------- -TODO: ... + +Addition assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 += column2``. + +The operator performs addition assginment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_addition_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score += n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs addition assignment operation such as '_score = _score + n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Good-bye Senna" as the ``_key`` +is 3. + +So the expression ``1 + 3`` is evaluated and stored to ``_score`` column as the execution result. + +Subtraction assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 -= column2``. + +The operator performs subtraction assginment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_subtraction_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score -= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score - n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Good-bye Senna" as the ``_key`` +is 3. + +So the expression ``1 - 3`` is evaluated and stored to ``_score`` column as the execution result. + +Multiplication assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 *= column2``. + +The operator performs multiplication assginment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_multiplication_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score *= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score * n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Good-bye Senna" as the ``_key`` +is 3. + +So the expression ``1 * 3`` is evaluated and stored to ``_score`` column as the execution result. + +Division assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 /= column2``. + +The operator performs division assginment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_division_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score /= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score / n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Good-bye Senna" as the ``_key`` +is 3. + +So the expression ``1 / 3`` is evaluated and stored to ``_score`` column as the execution result. + +Modulo assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 %= column2``. + +The operator performs modulo assginment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_modulo_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score %= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score % n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Good-bye Senna" as the ``_key`` +is 3. + +So the expression ``1 % 3`` is evaluated and stored to ``_score`` column as the execution result. + +Bitwise left shift assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 <<= column2``. + +The operator performs left shift assginment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_left_shift_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score <<= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score << n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Good-bye Senna" as the ``_key`` +is 3. + +So the expression ``1 << 3`` is evaluated and stored to ``_score`` column as the execution result. + +Bitwise signed right shift assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column2 >>= column2``. + +The operator performs signed right shift assginment operation on column1 by column2. + +Bitwise unsigned right shift assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 >>>= column2``. + +The operator performs unsigned right shift assginment operation on column1 by column2. + +Bitwise AND assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 &= column2``. + +The operator performs bitwise AND assignment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_and_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score &= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score & n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Groonga" as the ``_key`` +is 10. + +So the expression ``1 & 10`` is evaluated and stored to ``_score`` column as the execution result. + +Bitwise OR assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 |= column2``. + +The operator performs bitwise OR assignment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_or_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score |= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score | n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Groonga" as the ``_key`` +is 10. + +So the expression ``1 | 10`` is evaluated and stored to ``_score`` column as the execution result. + +Bitwise XOR assignment operator +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Its syntax is ``column1 ^= column2``. + +The operator performs bitwise XOR assginment operation on column1 by column2. + +.. groonga-command +.. include:: ../../example/reference/grn_expr/script_syntax/simple_xor_assignment_operator.log +.. select Entries --output_columns _key,n_likes,_score --filter true --scorer '_score ^= n_likes' + +The value of ``_score`` by ``--filter`` is always 1 in this case, +then performs subtraction assignment operation such as '_score = _score | n_likes' for each records. + +For example, the value of ``_score`` about the record which stores "Good-bye Senna" as the ``_key`` +is 3. + +So the expression ``1 ^ 3`` is evaluated and stored to ``_score`` column as the execution result. 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