Trying to understand preprocessor

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  • Posted by moskito_x Feb 08, 2013
  • 1508 views

Here is the D:\euphoria-405\demo\preproc\eu.cfg 

-p etml:etml.ex 
-p le,lex:literate.ex 
-p dex:datesub.ex:-f %m/%d/%Y

in the cmd window.

Example: etmltest.ex

README file
To run this example, at the command prompt type:
eui etmltest.ex

let's do it: 

D:\euphoria-405\demo\preproc>eui etmltest.ex 
usage: eui etmltest.ex <name>

Output: Error / Info
usage: eui etmltest.ex <name>

With <name> hello.etml 

D:\euphoria-405\demo\preproc>eui etmltest.ex hello.etml 
 
<html> 
    <head><title>Hello, hello.etml</title></head> 
    <body> 
        <h1>Say Hello</h1> 
                    <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                        <p>Hello, hello.etml!</p> 
                </body> 
</html>

Example: datesub.ex

file thedate.ex 

-- thedate.ex 
 
puts(1, "The date this was run is @DATE@\n")

D:/euphoria-405/docs/html/preproc.html
Now, let's run it, but first without a pre-processor hook defined.
eui thedate.ex 

D:\euphoria-405\demo\preproc>eui thedate.ex 
The date this was run is @DATE@

D:/euphoria-405/docs/html/preproc.html
Not very helpful? Ok, let's tell Euphoria how to use the pre-processor that we just created and then see what happens.
C:\MyProjects\datesub> eui -p eui:datesub.ex thedate.ex
The date this was run is 2009-08-05 19:36:22

Now see what really happens. 

D:\euphoria-405\demo\preproc>eui -p eui:datesub.ex thedate.ex 
The date this was run is @DATE@

surprised ? I also

Others attempts

file thedate.dex 

puts(1, "@DATE@\n")

Let's try thedate.dex (with a pre-processor hook defined). 

D:\euphoria-405\demo\preproc>eui -p eui:datesub.ex thedate.dex 
Can't open 'D:\euphoria-405\demo\preproc\thedate.dex'

Except the error message, a file has been created "D:\euphoria-405\demo\preproc\thedate.pp.dex-f"

file D:\euphoria-405\demo\preproc\thedate.pp.dex-f 

puts(1, "2013-02-09\n")

Let's try thedate.dex (without a pre-processor hook defined). It's in the eu.cfg "-p dex:datesub.ex:-f %m/%d/%Y" 

D:\euphoria-405\demo\preproc>eui thedate.dex 
Can't open 'D:\euphoria-405\demo\preproc\thedate.dex'

Except the error message, the file has been overwritten "D:\euphoria-405\demo\preproc\thedate.pp.dex-f"

How can I get it to run, so that the output is as described ??

D:/euphoria-405/docs/html/preproc.html
Not very helpful? Ok, let's tell Euphoria how to use the pre-processor that we just created and then see what happens.
C:\MyProjects\datesub> eui -p eui:datesub.ex thedate.ex
The date this was run is 2009-08-05 19:36:22

thanks for reading, moskito x

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