CODEWITHSUNDEEP
c#special-characterscode-generationt4
TheGrovesy
TheGrovesy

Reputation: 273

T4 editing the generated code as its generated

I have a c# application which generates embedded C code using T4 templates. However I have a small problem with the resulting output which I wonder if there is an elegant solution.

The issue is I loop around both for loops and foreach to create enums and other tables using the following T4 template:

typedef enum eSDef_Index
{
<#    for (int i = 0; i < ScreenDefinitions.Count(); i++)
      { #>
    SD_IDX_<#=ScreenDefinitions[i].Name.ToUpper() #> = <#=i#>,
<#    }
      // >>>> Can we do a backspace here?
#>
}eSDEF_INDEX;

This successfully creates the enum i want. However the C compiler I am using does not like the last enum entry to have the comma. I could fix this by checking if this is the last item in the list, however i wonder if there is a more elgant way?

My idea was to effectively delete the last comma after it has been generate using a backspace maybe.

So is it possible to add special characters which directly affect the generated code? or any other way of doing this?

Upvotes: 0

Views: 135

Answers (1)

Alexander Petrov
Alexander Petrov

Reputation: 14231

I think it's impossible.

Why not use string.Join method?

typedef enum eSDef_Index
{
    <#= string.Join(",\r\n    ",
            ScreenDefinitions.Select((x, i) =>
                $"SD_IDX_{x.Name.ToUpper()} = {i}")
    ) #>
}eSDEF_INDEX;

Place comment into first parameter (separator):

    <#= string.Join(", // Comment \r\n    ",
            ScreenDefinitions.Select((x, i) =>
                "SD_IDX_" + x.Name.ToUpper() + " = " + i)
    ) #>

Upvotes: 1

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