111 lines
3.6 KiB
XML
111 lines
3.6 KiB
XML
<?xml version="1.0"?>
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<!--
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Copyright (C) 2015 LoVullo Associates, Inc.
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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 Lesser 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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This package is young; the intent is to provide basic assertions to
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ensure data integrity. Failure will result in a~truthful value of
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a~terminating classification.
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The \ref{_assert_} template generates a~generic assertion using the
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provided predicates, causing termination on match. For convenience,
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it accepts variable or classification-name conditions as arguments,
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which are included with whatever predicates are provided in its
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body.
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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="@when@" desc="Conditional check (optional)" />
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<param name="@class@" desc="Conditional class check (optional)" />
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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="@desc@" desc="Description">
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<text>Assertion failure</text>
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</param>
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<param name="@__classyields@"
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desc="Classification yield to match on">
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<param-class-to-yields name="@class@" />
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</param>
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<classify as="@as@"
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desc="@desc@"
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terminate="true">
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<if name="@when@">
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<match on="@when@" />
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</if>
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<if name="@class@">
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<match on="@__classyields@" />
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</if>
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<!-- include any optional conditions -->
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<param-copy name="@values@" />
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</classify>
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</template>
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<section title="Standard Assertions">
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There is currently one standard assertion---\ref{_fail-on-empty_};
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more will appear in the future.
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\ref{_fail-on-empty_} terminates if \ref{_fail-on-empty_/@name@}
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is zero, subject to \ref{_fail-on-empty_/@when@} and
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\ref{_fail-on-empty_/@class@} and any other provided
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predicates.
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The name of this assertion is likely to change in the future, but
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a~template will be added in its place providing deprecation notices.
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<template name="_fail-on-empty_"
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desc="Fail when a value is zero">
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<param name="@values@" desc="Optional predicates to include in match" />
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<param name="@name@" desc="Data to check (scalar, vector or otherwise)" />
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<param name="@when@" desc="Conditional check (optional)" />
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<param name="@class@" desc="Conditional class check" />
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<param name="@desc@" desc="Description">
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<param-value name="@name@" />
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<text> is empty</text>
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</param>
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<t:assert desc="@desc@"
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when="@when@"
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class="@class@">
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<!-- include any optional conditions -->
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<param-copy name="@values@" />
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<match on="@name@" value="ZERO" />
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</t:assert>
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</template>
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</section>
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</package>
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