SmaCC: Transforming the AST

[joelreymont]

I understand that I can transform the source code but are there examples of transforming the AST?

For example, I would like to type-check my CPU architecture AST and replace string identifiers with instances of register classes, instructions, etc. @j-brant

[joelreymont]

The Transformations section of the SmaCC booklet says

However, if you want to write node rewrites in Smalltalk, SmaCCParseNode has some useful primitives to replace or add nodes to the tree.

Are these replace: and replaceWith:?

Are there any examples of using these, as well as matching primitives like match:inContext: and matchVariables:to:inContext:?

[j-brant]

If I'm doing large scale changes, I use the transformation toolkit. For example, here's what I use to convert antlr grammars:

IceRepositoryCreator
	fromUrl: 'https://github.com/antlr/grammars-v4.git'
	to: './grammars-v4' asFileReference.
SmaCCTransformationToolkitModel new
	inputParserClass: Antlr4Parser;
	validationParserClass: SmaCCDefinitionParser;
	loadRewriteFile: './pharo-local/iceberg/j-brant/SmaCC/rewrites/antlr/antlr.rw';
	files: ('./grammars-v4' asFileReference allChildrenMatching: '*.g4');
	outputDirectory: '.';
	createSubdirectories: true;
	runOnServer: false