First thing that I should point out is that I was having trouble getting IF ... ELSE statements to work inside of a FOR ... DO clause. Turns out (thanks to dbenham for inadvertently pointing this out in his examples) the ELSE statement cannot be on a separate line from the closing parens.
@ECHO OFF
SET ARG1=FALSE
SET ARG2=FALSE
SET ARG3=FALSE
SET ARG4=FALSE
SET ARGS=(arg1 Arg1 ARG1 arg2 Arg2 ARG2 arg3 Arg3 ARG3)
SET ARG=
FOR %%A IN (%*) DO (
SET TRUE=
FOR %%B in %ARGS% DO (
IF [%%A] == [%%B] SET TRUE=1
)
IF DEFINED TRUE (
SET %%A=TRUE
) ELSE (
SET ARG=%%A
GOTO UNDEFINED
)
)
ECHO %ARG1%
ECHO %ARG2%
ECHO %ARG3%
ECHO %ARG4%
GOTO END
:UNDEFINED
ECHO "%ARG%" is not an acceptable argument.
GOTO END
:END
@echo off
set var1=3
set var2=5
call :logic_or orResult "'%var1%'=='4'" "'%var2%'=='5'"
if %orResult%==1 (
echo At least one expression is true
) ELSE echo All expressions are false
exit /b
:logic_or <resultVar> expression1 [[expr2] ... expr-n]
SETLOCAL
set "logic_or.result=0"
set "logic_or.resultVar=%~1"
:logic_or_loop
if "%~2"=="" goto :logic_or_end
if %~2 set "logic_or.result=1"
SHIFT
goto :logic_or_loop
:logic_or_end
(
ENDLOCAL
set "%logic_or.resultVar%=%logic_or.result%"
exit /b
)
//thats an implicit IF cond1 OR cond2 OR cond3
if cond1 GOTO doit
if cond2 GOTO doit
if cond3 GOTO doit
//thats our else.
GOTO end
:doit
echo "doing it"
:end
Each block is resolved to true (i.e. ERRORLEVEL = 0 after the last statement in the block has executed) / false, until the value of the whole expression has been determined or control jumps out (e.g. via GOTO):
Set Evaluated_True=false
IF %condition_1%==true (Set Evaluated_True=true)
IF %some_string%=="desired result" (Set Evaluated_True=true)
IF %set_numerical_variable% EQ %desired_numerical_value% (Set Evaluated_True=true)
IF %Evaluated_True%==true (echo This is where you do your passing logic) ELSE (echo This is where you do your failing logic)
显然,它们可以是任何类型的条件求值,但我只是分享了几个例子。
如果你想把它们都写在一行里,你可以用 &&把它们连在一起,比如:
Set Evaluated_True=false
IF %condition_1%==true (Set Evaluated_True=true) && IF %some_string%=="desired result" (Set Evaluated_True=true) && IF %set_numerical_variable% EQ %desired_numerical_value% (Set Evaluated_True=true)
IF %Evaluated_True%==true (echo This is where you do your passing logic) ELSE (echo This is where you do your failing logic)
@(
Echo off
Set "_Match= 1 2 3 "
)
Set /a "var=3"
Echo:%_Match%|Find " %var% ">nul || (
REM Code for a false condition goes here
) && (
REM code for a true condition goes here.
)
我通过构建一个外部函数 IF 的可调用且干净的抽象将 Bogdan 的解决方案提升到了一个新的层次,这样就可以在内联块中使用它。如果您无论如何都要构建一个批处理库,那么就不要再进一步查看了。
lib.cmd
@ECHO OFF
SETLOCAL ENABLEEXTENSIONS
SHIFT & GOTO:%1
: Common batch extension library.
:::
: Performs conditional processing in batch programs. Is callable for inline use.
: Arguments:
: %1 - /I for case-insensitive comparison on strings, can be skipped for case-sensitive comparison.
: %2 - NOT to negate the result, can be skipped.
: %3 - EXIST for file checks or first string to compare with, also supports "string1"=="string2" (full condition).
: %4 - If EXIST is specified, path to the directory or file.
: Otherwise if %3 is not a full condition, this argument has to be one of:
: - == Compares both strings to be equal using lstrcmpW or lstrcmpiW (case-insensitive).
: - EQU Converts both strings to numbers and checks if they are equal.
: - NEQ Converts both strings to numbers and checks if they are not equal.
: - LSS Converts both strings to numbers and checks if the first is lesser than the second.
: - LEQ Converts both strings to numbers and checks if the first is lesser or equal than the second.
: - GTR Converts both strings to numbers and checks if the first is greater than the second.
: - GEQ Converts both strings to numbers and checks if the first is greater or equal than the second.
: If a string cannot be parsed to a number, its numeric representation will be used.
: This argument can be skipped, so == will be used.
: %5 - If %3 is not a full condition, this argument has to be the second string to compare.
: Outputs:
: Nothing
: Returns:
: 0, if the condition is met, 1 otherwise
:::
:test-if
IF "%~1"=="/I" SET "I=/I " & SHIFT
IF "%~1"=="/i" SET "I=/I " & SHIFT
IF "%~1"=="NOT" SET "NOT=NOT " & SHIFT
IF "%~1"=="not" SET "NOT=NOT " & SHIFT
IF "%~1"=="EXIST" SET "EXIST=EXIST " & SHIFT
IF "%~1"=="exist" SET "EXIST=EXIST " & SHIFT
SET "string1=%~1%"
IF "%~3"=="" (
SET "comp=^=^="
SET "string2=%~2"
) ELSE (
SET "comp=%~2"
SET "string2=%~3"
)
IF %I%%NOT%%EXIST% "%string1%" %comp% "%string2%" (
ENDLOCAL & EXIT /B 0
)
ENDLOCAL & EXIT /B 1