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Diffstat (limited to 'printers/README')
| -rw-r--r-- | printers/README | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/printers/README b/printers/README new file mode 100644 index 0000000..36530ed --- /dev/null +++ b/printers/README @@ -0,0 +1,19 @@ +This directory contains print routines for the structures defined in +the ast/ directory. + +The global *print-structure* controls printing of objects in the +structure system. Values are: + haskell -- Prints haskell format expressions from ast + struct -- Prints the raw structs (with circularity check) + top -- Prints top level only of the struct + +The file defs.scm has the basic hooks to the printer mechanism. The +idea is that when *print-structure* is 'haskell, the print function stored +in the type descriptor will get used. If there isn't a print function, +or if *print-structure* is false, then the thing will print out in +some generic way that's good for debugging purposes. + +The macro define-printer is used to associate a print function with a +structure type. Since these can be defined on the fly, the print +dispatching routine has to look up the inheritance chain of type +descriptors looking for the first inherited type that has a printer. |