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Syntax Grammar
A section of a Shape Script can be quite complex, containing a number of commands and parameters. This table provides a breakdown of the Shape Script structure, illustrating how commands and parameters are constructed. The first entry is the top-level declaration, and subsequent entries show the composition of successively more detailed components.
Grammar Symbols
- * = zero or more
- + = one or more
- | = or
; = terminator
Symbol |
Description |
See also |
|---|---|---|
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ShapeScript ::= |
<Shape>*; |
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Shape ::= |
<ShapeDeclaration> <ShapeBody>; |
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ShapeDeclaration ::= |
<ShapeType> <ShapeName>; |
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ShapeType ::= |
"shape" | "decoration" | "label"; |
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ShapeName ::= |
<ReservedShapeName> | <stringliteral>; |
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ReservedShapeName ::= |
See Reserved Names for full reserved shape listing. |
Reserved Names |
|
ShapeBody ::= |
"{" <InitialisationAttributeAssignment>* <DrawingStatement>* <SubShape>* "}"; |
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InitialisationAttributeAssignment ::= |
<Attribute> "=" <Value> ";"; |
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Attribute ::= |
See Shape Attributes for full listing of attribute names. |
Shape Attributes |
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DrawingStatement ::= |
<IfElseSection> | <Method>; |
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IfElseSection ::= |
"if" "("<QueryExpression>")" <TrueSection> (<ElseSection>); |
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QueryExpression ::= |
<QueryName> "(" <ParameterList> ")"; See Query Methods for descriptions of the queries and their parameters. |
Query Methods |
|
QueryName ::= |
See Query Methods for the possible Query names. |
Query Methods |
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TrueSection ::= |
"{" <DrawingStatement>* "}" |
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ElseSection ::= |
"else" "{" <DrawingStatement>* "}" |
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Method ::= |
<MethodName> "(" <ParameterList> ")" ";"; |
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MethodName ::= |
See Drawing Methods for a full listing of method names. |
Drawing Methods |
