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- PSL Structure Editor
- -------------------
- Based on the BBN-Lisp editor, circa 1968, and its descendants.
- This editor can be entered from inside the break loop or by calling
- the functin Edit on a structure to be edited. For information on
- other editors do (Help Editor).
- Looking Commands:
- P Print the current level. The printout replace all sublevels deeper
- than 'plevel' by ***. 'plevel' is initialized to 3.
- PL n Change 'plevel' to n.
- 'Stroll around in the structure' commands
- n (>0) sets the new current level to the n-th element in the
- present current level (Walk down to the n-th sub-expression).
- -n (n>0) sets the current level to the n-th cdr in the present current
- level.
- UP go up to the level you were in just before
- T go to the top of the original expression
- F s Find the first occurence of s . Test is performed by equal.
- After executing, current level is set to the first level s was
- a member in.
- Structure changing commands:
- (Notice, that all these commands are parenthesis expressions.)
- (n) Delete the n-th element (in the current level)
- (n S ...S ) Replace the n-th element by S ...S .
- 1 n
- (-n S ...S ) Insert before the n-th element the elements S ...S .
- 1 n
- (R S S ) Replace all occurence (in the tree you are placed at)
- 1 n of S by S (Equal test).
- Others:
- B Enter a break loop.
- OK Leave the editor.
- HELP Print this text.
- E Eval and print the next expression.
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