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--- 02_user_tutorials:03_graph_xl:common_rewriting_rules [2025/01/24 15:51] – ↷ Page moved from 02_user_tutorials:graph_xl:common_rewriting_rules to 02_user_tutorials:03_graph_xl:common_rewriting_rules tim2
+++ 02_user_tutorials:03_graph_xl:common_rewriting_rules [2025/12/10 12:54] (current) – removed gaetan
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-====== Structural rules ======
-===== L-System style =====
-Of the two structural rules this one is much more commonly used in GroIMP.
-It replaces each instance of the pattern defined on the left side with the new created graph structure on the right side.
-<code>
-<pattern> ==> <structure>;
-</code>
-So if all A's in the model should be replaced by F's the patterns a the A's and the new structure is an F:
-<code>
-A ==> F;
-</code>
-==== pattern side ====
-The definition of the pattern that should be replaced can be defined by using [[01_user_documentation:groimp-platform:graph_queries| xl syntax]] and [[01_user_documentation:groimp-platform:xl-builtin-methods|XL builtin methods]].
-<code>
-A[F] ==> F;
-</code>
-<code>
-first((*A*)) ==> F;
-</code>
-Additionally the pattern can be defined using conditions:
-<code>
-A(1)==>F;
-</code>
-<code>
-a:A,(a.len!=1)==>F;
-</code>
-==== structure side ====
-A more complex structure can be created by using the  [[01_user_documentation:3d-guide:3d-manipulations#turtle_commands|turtle geometry]] and  [[01_user_documentation:3d-guide:3d-manipulations#graph-syntax|graph-syntax]].
-<code>
-A ==> F [RL(90) F A] F +> A;
-</code>
-With the addition of modules and 3d objects more object oriented nodes can be added:
-<code>
-A ==> F [RL(90) Cylinder(1,4) A] F +> MyNewNode(2.4);
-</code>
-===== SPO style =====
-SPO: Single pushout graph rewriting
-====== Execution rule ======
-<code java>
-[ <pattern> ::> <java code> ]
-</code>
-e.g.
-<code java>
-[ a:A ::> println( a ); ]
-</code>