78 lines
2.6 KiB
XML
78 lines
2.6 KiB
XML
<?xml version="1.0"?>
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<!--
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Copyright (C) 2014-2020 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:c="http://www.lovullo.com/calc"
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xmlns:t="http://www.lovullo.com/rater/apply-template"
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core="true"
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desc="Template Generation">
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This package provides various templates for generating templates and
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iterating using templates.
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In essense,
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this package is intended to abstract away certain implementation details
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and complexities that make groking code more difficult;
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they should be used when possible to improve code maintenance.
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<section title="Iteration">
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\ref{_for-each-n_} recurisvely produces the body~\tt{@values@} given a
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numeric range and step.
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This can also be used to generate sequences at compile-time rather than
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using functions,
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provided that the sequence data are static.
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<template name="_for-each-n_"
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desc="Recursively apply body with counter and step">
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<param name="@values@" desc="Body" />
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<param name="@start@" desc="Counter start" />
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<param name="@end@" desc="Counter end" />
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<param name="@step@" desc="Counter step" />
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<param name="@next_n@" desc="Next iteration value">
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<param-add name="@start@" value="@step@" />
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</param>
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<param name="@n_dec@" desc="Current n - 1">
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<param-add name="@start@" value="-1" />
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</param>
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<!-- inefficient trick to expose @current_n@ to the body -->
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<inline-template>
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<for-each>
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<set current_n="@start@" current_n_dec="@n_dec@" />
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</for-each>
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<param-copy name="@values@" />
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</inline-template>
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<!-- repeat body for each step, as sibling -->
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<unless name="@start@" eq="@end@">
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<t:for-each-n start="@next_n@" end="@end@" step="@step@">
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<param-copy name="@values@" />
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</t:for-each-n>
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</unless>
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</template>
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</section>
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</package>
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