`f:{unshift,push}-args' added
parent
18c1614777
commit
c526fa2925
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@ -174,6 +174,10 @@
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increasing the argument count of @var{fnref} will @emph{decrease}
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the arity of the resulting reference and vice versa.
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@emph{No validations are performed on arity}—if there exist more
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arguments than the number of target function parameters, no error
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will be raised.
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@var{fnref} must be a valid dynamic function reference.
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-->
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<function name="f:set-args" as="item()+">
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@ -202,4 +206,32 @@
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<sequence select="$args" />
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</function>
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<!--
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Pushes @var{args} onto the argument list of @var{fnref}
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This operates just as @code{f:set-args}, but retains existing arguments.
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-->
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<function name="f:push-args" as="item()+">
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<param name="fnref" as="item()+" />
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<param name="args" as="item()*" />
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<sequence select="f:set-args($fnref,
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(f:args( $fnref ), $args) )" />
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</function>
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<!--
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Unshifts @var{args} onto the argument list of @var{fnref}
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This operates just as @code{f:set-args}, but retains existing arguments.
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-->
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<function name="f:unshift-args" as="item()+">
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<param name="fnref" as="item()+" />
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<param name="args" as="item()*" />
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<sequence select="f:set-args($fnref,
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($args, f:args( $fnref )) )" />
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</function>
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</stylesheet>
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@ -43,6 +43,7 @@
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<foo:a />
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<foo:b />
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<foo:c />
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<foo:d />
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</foo:args>
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</variable>
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@ -396,4 +397,154 @@
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test="count( $x:result ) = 2" />
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</scenario>
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</scenario>
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<scenario label="f:push-args mutator">
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<scenario label="pushing arguments onto empty reference list">
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<call function="f:push-args">
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<param name="fnref"
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select="$test-fn" />
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<param name="args"
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select="$args/foo:a,
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$args/foo:b" />
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</call>
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<expect label="retains target QName"
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test="f:QName( $x:result ) = f:QName( $test-fn )" />
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<expect label="reduces arity by number of arguments, relative to
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target function"
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test="f:arity( $x:result ) = f:arity( $test-fn ) - 2" />
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<expect label="sets arguments by reference"
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test="f:args( $x:result )[ 1 ] is $args/foo:a
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and f:args( $x:result )[ 2 ] is $args/foo:b" />
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</scenario>
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<scenario label="pushing arguments onto populated reference
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list">
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<call function="f:push-args">
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<param name="fnref"
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select="f:set-args( $test-fn,
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($args/foo:a,
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$args/foo:b) )" />
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<param name="args"
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select="$args/foo:c,
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$args/foo:d" />
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</call>
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<expect label="retains target QName"
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test="f:QName( $x:result ) = f:QName( $test-fn )" />
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<expect label="reduces arity by number of arguments, relative to
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previous arity"
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test="f:arity( $x:result ) = f:arity( $test-fn ) - 4" />
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<expect label="retains previous arguments by reference"
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test="f:args( $x:result )[ 1 ] is $args/foo:a
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and f:args( $x:result )[ 2 ] is $args/foo:b" />
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<expect label="pushes new arguments by reference"
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test="f:args( $x:result )[ 3 ] is $args/foo:c
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and f:args( $x:result )[ 4 ] is $args/foo:d" />
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</scenario>
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<scenario label="pushing empty argument list onto populated
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reference list">
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<call function="f:push-args">
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<param name="fnref"
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select="f:set-args( $test-fn,
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($args/foo:a,
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$args/foo:b) )" />
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<param name="args" select="()" />
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</call>
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<expect label="retains target QName"
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test="f:QName( $x:result ) = f:QName( $test-fn )" />
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<expect label="retains previous reference arity"
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test="f:arity( $x:result ) = f:arity( $test-fn ) - 2" />
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<expect label="retains previous arguments by reference"
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test="f:args( $x:result )[ 1 ] is $args/foo:a
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and f:args( $x:result )[ 2 ] is $args/foo:b" />
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</scenario>
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</scenario>
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<scenario label="f:unshift-args mutator">
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<scenario label="unshifting arguments onto empty reference list">
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<call function="f:unshift-args">
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<param name="fnref"
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select="$test-fn" />
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<param name="args"
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select="$args/foo:a,
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$args/foo:b" />
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</call>
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<expect label="retains target QName"
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test="f:QName( $x:result ) = f:QName( $test-fn )" />
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<expect label="reduces arity by number of arguments, relative to
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target function"
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test="f:arity( $x:result ) = f:arity( $test-fn ) - 2" />
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<expect label="sets arguments by reference"
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test="f:args( $x:result )[ 1 ] is $args/foo:a
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and f:args( $x:result )[ 2 ] is $args/foo:b" />
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</scenario>
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<scenario label="unshifting arguments onto populated reference
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list">
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<call function="f:unshift-args">
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<param name="fnref"
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select="f:set-args( $test-fn,
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($args/foo:a,
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$args/foo:b) )" />
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<param name="args"
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select="$args/foo:c,
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$args/foo:d" />
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</call>
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<expect label="retains target QName"
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test="f:QName( $x:result ) = f:QName( $test-fn )" />
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<expect label="reduces arity by number of arguments, relative to
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previous arity"
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test="f:arity( $x:result ) = f:arity( $test-fn ) - 4" />
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<expect label="retains previous arguments by reference"
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test="f:args( $x:result )[ 3 ] is $args/foo:a
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and f:args( $x:result )[ 4 ] is $args/foo:b" />
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<expect label="unshifts new arguments by reference"
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test="f:args( $x:result )[ 1 ] is $args/foo:c
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and f:args( $x:result )[ 2 ] is $args/foo:d" />
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</scenario>
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<scenario label="unshifting empty argument list onto populated
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reference list">
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<call function="f:unshift-args">
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<param name="fnref"
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select="f:set-args( $test-fn,
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($args/foo:a,
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$args/foo:b) )" />
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<param name="args" select="()" />
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</call>
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<expect label="retains target QName"
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test="f:QName( $x:result ) = f:QName( $test-fn )" />
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<expect label="retains previous reference arity"
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test="f:arity( $x:result ) = f:arity( $test-fn ) - 2" />
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<expect label="retains previous arguments by reference"
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test="f:args( $x:result )[ 1 ] is $args/foo:a
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and f:args( $x:result )[ 2 ] is $args/foo:b" />
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</scenario>
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</scenario>
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</description>
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