Added 'format' argument so the result of the substr can be processed

[axunonb]

Enhanced SubStringFormatter

The only syntax in v2:

{ string : substr(start,length) }

Added optional format-placeholder in v3

{ string : substr(start,length) : {format-placeholder} }

value: Only strings can be processed. Other objects cause a FormattingException.

arguments: The start position and the lenght of the sub-string.

NEW
format-placeholder: A nested Placeholder that lets you format the result of the sub-string operation.

Examples with Format argument

The Format argument must contain nested Placeholder, and may contain literal text.

Convert the substring to lower-case

Smart.Format("{0:substr(0,2):{ToLower}}", "ABC");
//                          |        |
//                          + format +
//                             arg
// Outputs: "ab"

Format the substring chars with the ListFormatter

Format the substring with literal text and placeholder.

smart.Format("{0:substr(0,2):First 2 chars\\: {ToLower.ToCharArray:list:'{}'| and }}", "ABC");
// Outputs: "First 2 chars: 'a' and 'b'"

[codecov]

Codecov Report

Merging #258 (07e63ae) into version/v3.0 (9d6c444) will increase coverage by 0%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           version/v3.0   #258   +/-   ##
===========================================
  Coverage            96%    96%           
===========================================
  Files                91     91           
  Lines              3154   3162    +8     
===========================================
+ Hits               3036   3044    +8     
  Misses              118    118           

Impacted Files	Coverage Δ
src/SmartFormat/Extensions/SubStringFormatter.cs	100% <100%> (ø)

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