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A Visual Programming Environment Based on Graph Grammars and Tidy Graph Drawing

A Visual Programming Environment Based on Graph Grammars and Tidy Graph Drawing. Y. Adachi, Y. Miyadera, K. Sugita K. Tsuchida and T. Yaku. Contents. * Introduction : Purpose, Characteristics and Related Projects * Hichart Tree Structured Diagram (TSD) (1) Characteristics,

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A Visual Programming Environment Based on Graph Grammars and Tidy Graph Drawing

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  1. A Visual Programming Environment Based on Graph Grammars and Tidy Graph Drawing Y. Adachi, Y. Miyadera, K. Sugita K. Tsuchida and T. Yaku

  2. Contents * Introduction : Purpose, Characteristics and Related Projects * Hichart Tree Structured Diagram (TSD) (1) Characteristics, (2) Attribute Graph Grammar * Hichart TSD Processing System (1) Translator (HiTRANS), (2) Editor (HiED) * Hichart Tidy Drawing Algorithm (HiTD) * Conclusion

  3. Purpose and Characteristics • Motivation : * Extension of Application Fields of Visualization. * Need of Theoretical Background for Them. (1) Constructing Automated Processing System (2) Studying Drawing Algorithm. • Target : Visualization of Programs. • Characteristics : (1) Using Tree Structured Diagram (TSD) (2) Applying Attribute Graph Grammar(AGG)

  4. Related Projects, System Components • Related Projects : (1) IPSEN-PROGRESS targets program semantics, (2) PLAN2D targets nested graphs, (3) DiaGen, (4) GraphEd target general graphs. • Components of Our System (1) Syntactical Editor (HiED), (2) Translator targeting Pascal/C/DXL (HiTRANS), (3) TSD Tidy Drawing Algorithms.

  5. Fig. 1 Components of the System

  6. Fig. 2 Example Hichart TSD

  7. 2.1 Characteristics of Hichart TSD • is a planary Graph. • shows both datastructures and controlflow simultaneously. • is satisfying some graphicalconstraints. (e.g. (a) hierarchical alignment, (b) uniform gap between cells.)

  8. 2.2 Attribute Graph Grammar Used for Constructing This System • AGG : (GGu, A, F) * GGu : underlyingcontext-freegraphgrammar. * A : set of attributes ( set of numerical values and functions.) * F : set of semanticrules ( set of relations among attributes)

  9. Table 1 Attributes of HiAGG

  10. Table 2 Example of Semantic Rules

  11. 3. HiTRANS : Translator of TSD • Components an Features of Translators (1) X2H : Pascal/C/DXL to Hichart translator. input : Pascal/C/DXL source code, output : Hichart internal code and TSD. (2) H2X : Hichart to Pascal/C/DXL translator. input : Hichart internal code, output : Pascal/C/DXL program code. Rem. Hichart internal code is a text file.

  12. Main Phases of H2X Parser ; input : a Hichart internal code as input, output : a derivation tree for TSD. Attribute-evaluator(A); input : a derivation tree, evaluation : attributes about cell size, type, inside cells. Attribute-evaluator(B); input : a derivation tree, evaluation : attributes about drawing condition among cells. Code-generator: generates program source codes.

  13. Fig. 3 Parsing of a TSD

  14. 4 HiED:TSD Editor • Feature (a) Editing Commands (1) Generation, (2) Insertion, (3) Deletion. (b) Characteristics * Generation of Grammatically Correct TSDs. • Method * Providing of Editing Command Based on the ProductionRules of the HiAGG.

  15. 5 HiTD:Drawing Algorithm of TSD HiTD : a program flowchart processing system that automatically generates tidy Hichart TSD using the theory of “tidy drawing problem”.

  16. Constraints of Layout • Constraints: (B1) planarity condition, (B2,3) hierarchyalignment condition, (B4) balancing condition of a sub-tree, (B5) isomorphism for sub-trees, (B6(k)) overlapping condition w.r.t a par. k, (B7) other overlapping condition.

  17. Conditions and Algorithms of Drawing • Conditions E0 = B1, B2,3, B4, B5, B6(0), E1 = B1, B2,3, B4, B5;E2 = B1, B2,3, B4, E3(k) = B1, B2,3, B4, B5, B6(k), B7 E4 = B1, B2,3, B4, B5, B7 • Algorithms HiTD-Proc : procedural algorithm HiTD-Cnst : constraint based algorithm HiTD-Agg : AGG based algorithm

  18. Fig. 6 Structure of Hichart Drawing

  19. Conclusion • Development of a Visual Programming Environment Based on Graph Grammar. • Definition of Complete AGG for Pascal/C/ DXL. • DevelopmentofaSyntactical Programming TSD Processing. (1) HiED, (2) HiTRANS, (3) HiTD • Implementation of a TSD Processing System Based on This AGG.

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