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| -rw-r--r-- | parzival.lisp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/parzival.lisp b/parzival.lisp index 71bb6c0..9f80fef 100644 --- a/parzival.lisp +++ b/parzival.lisp @@ -182,7 +182,12 @@ CONDITION is true, then the THEN parser is run, otherwise the ELSE parser is run (defun <<or (&rest parsers) "Tries each parser one after the other, rewinding the input stream after each - failure, and resulting in the first successful parse." + failure, and resulting in the first successful parse. + + Hence, the order in which the parsers appear is significant. As a + general rule, you should list the most specific parsers first. + + E.g. (<<string \"foobar\") is more specific than (<<string \"foo\")" (cond ((null parsers) <fail<) ((null (cdr parsers)) (car parsers)) (t |