Editing Template:Chem molar mass/format

{{#if:{{{fixed|}}}|{{#ifexpr:{{{value|}}}>0|[[Category:Chem-molar-mass both hardcoded and calculated]]}}}}{{#iferror:{{{value|}}}<!--
 iferror: true
-->|{{#if:{{{fixed|}}}|<!-- error in fixed, return as is: -->{{{fixed|}}}|<!-- error is in calculation: --><sup class="noprint Inline-Template" style="white-space:nowrap;">&#91;''[[Wikipedia:WikiProject Chemicals/Molar mass#Cannot calculate molar mass|<span title="Cannot calculate molar mass from chemical formula)">cannot calculate</span>]]''&#93;</sup>}}{{main other|[[Category:Articles with erroneous molar mass calculations]]}}<!--

 iferror:false
 prefix: hidden sortkey ntsh
 buggy: this way, sorted is the non-rounded value...
 -->|{{#ifeq:{{{sortable|no}}}|yes|{{ntsh|1={{#if:{{{fixed|}}}|{{#invoke:String|match|s={{{fixed|}}} |pattern=^[%d%.%-%−]+ |plain=false |nomatch={{{fixed|0}}}}} |{{{value|0}}} }} |debug=no<!-- set to =yes to test/show the hidden key -->}} }}<!--
 round the value:
 parameter round can be: yes, no, smart, number.
 rounding number cannot be greater than smart (=smart number of decimals), so use min(,).

 smart number cannot be empty, but is covered with "|2" here
  -->{{#if:{{{fixed|}}}|{{{fixed|}}}|
{{#ifexpr:{{{value|0}}}=0|<!-- no input, no value output -->|{{val|{{#invoke:math|precision_format |{{{value|0}}} 
 |{{#switch:{{{round|smart}}}
 |yes={{min|2|{{{smart_round|2}}}}}<!-- min(2, smart) -->
 |no={{{smart_round|2}}}<!-- smart -->
 ||default|smart={{{smart_round|2}}}
 |#default={{min|{{{round|0}}}|{{{smart_round|2}}}}}<!-- when number; min(number, smart) -->}}
}} }} }} }}<!--

 iferror: close
-->}}<!--
 suffix: if sort=no then add unit
-->{{#ifexpr:{{{value|0}}}=0||{{#ifeq:|{{{sortable|unk}}}|no|&nbsp;{{#if:{{{unit|}}} |{{{unit|}}}|g·mol<sup>−1</sup>}}}}}}<!--
 suffixes, will always show:
-->{{{ref|}}}{{#if:{{{comment|}}}|&#x20;{{{comment|}}}}}<!--


-xxx-> <small>(debug:smart_round={{{smart_round|(blank)}}})</small><!--

--><noinclude>{{documentation|1=Template:Chem molar mass/doc}}</noinclude>