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Eli: Translator Construction Made Easy

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Tasks related to generating output

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PTG Output for Leaf Nodes

The module LeafPtg provides some standard translations of terminal input strings into output strings. They may be attached to nonterminal symbols having an int valued attribute Sym which represents a string, an identifier or a number. That symbol usually derives to a terminal symbol which is used to compute the value of the Sym attribute.

The module does not have generic parameters. It is used by writing 

   $/Output/LeafPtg.fw
in a .specs file.

The computations of this module yield an attribute Ptg of type PTGNode representing the desired output string. It may be used to compose more complex output structures.

The required computation of the Sym attribute can be specified by (if not already done for other purposes): 

   ATTR Sym: int;
   SYMBOL T COMPUTE SYNT.Sym = TERM; END;

There are the following symbol roles for different output representations: 

   SYMBOL T INHERITS  IdPtg  END;
T.Sym must refer to an identifier or a string then T.Ptg represents the same identifier or character sequence of the string in the output. 

   SYMBOL T INHERITS  CStringPtg  END;
T.Sym must refer to a string, then T.Ptg represents its value as a C string literal. 

   SYMBOL T INHERITS  PStringPtg  END;
T.Sym must refer to a string, then T.Ptg represents its value as a Pascal string literal. 

   SYMBOL T INHERITS  NumPtg  END;
T.Sym must represent an integral number, then T.Ptg represents that number.

The module uses some PTG patterns from the module PtgCommon.

Please note that this module may become outdated in future Eli-Versions. In new specifications use the module PtgCommon directly to create PTG representations for terminal symbols. The module PtgCommon is described in the next section.

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