tame/core/datetime.xml

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XML

<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
Copyright (C) 2015, 2017 R-T Specialty, LLC.
This file is part of tame-core.
tame-core is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-->
<package xmlns="http://www.lovullo.com/rater"
xmlns:c="http://www.lovullo.com/calc"
core="true"
desc="Date and time">
<import package="base" />
Providing the current timestamp externally allows the system to be
wholly deterministic.
It also captures the state of the data in time,
so re-calculating in the future (e.g. using the summary pages)
will yield the same result.
<param name="timestamp_current" type="integer" default="0"
desc="Unix timestamp representing the current time of the
system (clock time), as it should be perceived" />
This system does not handle its own arthiemtic to figure out the
current date components from the given timestamp.
<param name="timestamp_year" type="integer" default="0"
desc="Current year (clock time), as it should be perceived" />
<param name="timestamp_month" type="integer" default="0"
desc="Current month (clock time), as it should be perceived;
1-indexed" />
<param name="timestamp_day" type="integer" default="0"
desc="Current day (clock time), as it should be perceived;
1-indexed" />
<!--
Determines how many years the given date is relative to the current date
Note that a positive number will be returned if the given date is
in the past, negative if in the future.
-->
<template name="_age-years_" desc="Age in years of the given date relative to the current">
<param name="@generates@" desc="Generator variable, per index" />
<param name="@yearset@" desc="Set of years to iterate on" />
<param name="@sym@" desc="Generator symbol" />
<param name="@when@" desc="Only when this boolean value is true" />
<param name="@default@" desc="Default age when yearset values are empty" />
<param name="@yields@" desc="Variable to yield into">
<text>_</text>
<param-value name="@generates@" />
</param>
<rate yields="@yields@">
<c:sum of="@yearset@" index="k" generates="@generates@" desc="Relative age" sym="@sym@">
<c:cases>
<if name="@when@">
<c:case>
<c:when name="@when@" index="k">
<c:eq>
<c:value-of name="FALSE" />
</c:eq>
</c:when>
<!-- return a default, or 0 if no default is provided -->
<if name="@default@">
<c:value-of name="@default@" index="k" />
</if>
<unless name="@default@">
<c:const value="0" type="integer" desc="Condition not met, but no default" />
</unless>
</c:case>
</if>
<!-- if no @when@, then we'll always do this -->
<c:otherwise>
<c:cases>
<c:case>
<c:when name="@yearset@" index="k">
<c:gt>
<c:const value="0" type="integer" desc="Only calculate difference if a value is available" />
</c:gt>
</c:when>
<c:sum label="Calculate by subtracting the given year from the current year">
<c:value-of name="timestamp_year" />
<c:product>
<c:value-of name="NEGATE" />
<c:value-of name="@yearset@" index="k" />
</c:product>
</c:sum>
</c:case>
<!-- we don't have a value; just use the default age we were given -->
<if name="@default@">
<c:otherwise>
<c:value-of name="@default@" index="k" />
</c:otherwise>
</if>
</c:cases>
</c:otherwise>
</c:cases>
</c:sum>
</rate>
</template>
</package>