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July 19, 2023 02:18
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I needed a little tool to do ifdefs, for conditional inclusion of text; I didn't want the full panoply of the C preprocessor. I like this. Test-driven development in awk.
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| #!/usr/bin/awk -f | |
| # Experimental implementation of ifdef in awk | |
| BEGIN { | |
| depth = 0; | |
| defined = ""; | |
| printing = 1; | |
| } | |
| $1 ~ /#DEFINE/ { | |
| defined = defined ":" $2; | |
| next; | |
| } | |
| $1 ~ /#IFDEF/ { | |
| if (printing) { | |
| printing = match( defined, $2); | |
| } | |
| if (!printing) { | |
| depth ++; | |
| } | |
| next; | |
| } | |
| $1 ~ /#ENDIF/ { | |
| depth --; | |
| if (printing == 0 && depth < 1) { | |
| printing = 1; | |
| } | |
| next; | |
| } | |
| { | |
| if (printing) { | |
| print($0); | |
| } | |
| } |
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| #DEFINE test1 | |
| #DEFINE test3 | |
| 1 This should print anyway. | |
| #IFDEF test1 | |
| 2 This should print because test1 is defined. | |
| #ENDIF | |
| 3 This should print anyway. | |
| #IFDEF test1 | |
| 4 This should print because test1 is defined. | |
| #IFDEF test2 | |
| 5 This should NOT print because test2 is not defined. | |
| #IFDEF test3 | |
| 6 This should NOT print even though test3 is defined, because still in scope of test2. | |
| #ENDIF | |
| #ENDIF | |
| 7 This should print because out of scope of test2. | |
| #ENDIF | |
| 8 This should print anyway. | |
| #IFDEF test3 | |
| 9 this should print because test3 is defined. | |
| #IFDEF test2 | |
| 10 This should not print because test2 is not defined. | |
| #ENDIF | |
| 11 This should print because out of scope of test2. | |
| #ENDIF | |
| 12 This should print anyway. | |
| Summary: Lines 1, 2, 3, 4, 7, 8, 9, 11 and 12 should print; all | |
| others should not. |
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