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how to implement a rule-based modeling system

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Hi. I am lerning to write an L-system like program that can load user-provided "rules", and generate street networks from these rules. I have read some academic papers on it, and have had a look at Procedural's CityEngine. In cityEngine the rules loook like this: Lot--> extrude(height) Envelope Envelope--> case geometry.isRectangular(10); 50% : Tower 25% : UShape else: LShape else 50% : LShape else: Tower LShape -->...... The questions are 1) how to parse rules like above provided in a txt file. 2) and what's the general pattern to apply "rules".. . could you give me some advices on it. or tell me what books, or open-source implementation I can refer to ? Thanks

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