115 lines
3.9 KiB
XML
115 lines
3.9 KiB
XML
<?xml version="1.0"?>
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<!--
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Copyright (C) 2014-2021 Ryan Specialty Group, LLC.
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This file is part of tame-core.
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tame-core is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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-->
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<package xmlns="http://www.lovullo.com/rater"
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xmlns:t="http://www.lovullo.com/rater/apply-template"
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core="true"
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desc="Assertions">
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<import package="base" />
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<import package="vector/cmatch" export="true" />
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This package is young;
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the intent is to provide basic assertions to ensure data
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integrity.
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\emph{N.B. The behavior of this package changed in version 1.0.0---%
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\ref{_assert_} now properly fails on non-match,
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not match.}
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The \ref{_assert_} template generates a~generic assertion using the
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provided predicates.
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If the predicates provided to the assertion fail (yields $\bot$),
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the system immediately terminates.\footnote{
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Beacuse the system stops processing once a terminating classification
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yields~$\top$,
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only one assertion will ever match,
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even if others would match if execution were to continue.}
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\tt{@class@} may optionally be used to predicate the asseriton itself---%
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the assertion will be performed only on respective class matches.
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\ref{_assert_} implements assertions by genearting two classifications---%
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one to perform the actual assertion,
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and a terminating classification to ensure that the assertion
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yields~$\top$.
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The param \ref{assert_ignore} will suppress assertion failures at runtime.
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<param name="assert_ignore" type="boolean" default="0"
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desc="Ignore assertion failures" />
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<template name="_assert_"
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desc="Terminate on predicate failure">
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<param name="@values@" desc="Predicates" />
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<param name="@as@" desc="Generated classification name">
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<text unique="true">-assert-</text>
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</param>
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<param name="@failure@" desc="Failure description">
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<text>Assertion</text>
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</param>
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<param name="@class@" desc="Only perform assertion for respective class
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matches (optional)" />
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<param name="@neg-as@"
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desc="Generated name for classification to be negated">
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<text unique="true">-nassert-</text>
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</param>
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<param name="@neg-yields@"
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desc="Generated yield for classification to be negated">
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<text unique="true">_nassert</text>
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</param>
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<param name="@neg-desc@" desc="Description for negative classification">
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<param-value name="@failure@" />
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<text> (assertion result)</text>
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</param>
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<!-- The actual assertion will be performed by one classification... -->
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<classify as="@neg-as@" yields="@neg-yields@" desc="@neg-desc@">
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<any>
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<!-- if class is provided and does not match, then the assertion
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succeeds automatically -->
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<if name="@class@">
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<t:match-class name="@class@" value="FALSE" />
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</if>
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<all>
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<param-copy name="@values@" />
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</all>
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</any>
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</classify>
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<!-- ...which is in turn negated for the terminating
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classification. The reason for this is that terminating
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classifications terminate on _match_. -->
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<classify as="@as@" desc="@failure@" terminate="true">
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<match on="assert_ignore" value="FALSE" />
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<match on="@neg-yields@" value="FALSE" />
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</classify>
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</template>
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</package>
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