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documentation (#34)
* Backport changes from chapter 5 to older chapters (#30)
* Fix wrong indent
* Backport to chapter 4
* Backport to chapter 3
* Backport to chapter 2
* Backport to chapter 1
* Add if statement to comment (#32)
* Update visuals for chapters 1,2 & 3.
Reenable drawing of edges from constants to Start for these chapters.
* Update visuals for chapters 4.
Revise text to explain the labeling of edges in graphs and that we omit edge from Constant to Start nodes from chapter 4.
* Add code snippets for if statement parsing and the duplication and merging of ScopeNodes.
Explain how scopeNodes are duplicated and merged.
* Add constant check to minus node (#31)
* Fix closing root block with } (#33)
* Backport fix closing root block with } to chapter 4 and 3 (#35)
* Show use-def edge from Phi to Region as dotted edge.
Add example of Phi peephole.
Update visuals.
Add more examples.
* Fix visuals in chapter 1 and README in chapter 4.
* Remove subheading
* Adjust spaces
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Co-authored-by: XmiliaH <45106915+XmiliaH@users.noreply.github.com>
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ScopeNode added to chapter 3
Revised the description for Chapter 3 and 4 to include ScopeNode.
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* Chapter 3 - add vars and lexical scope.
* Fix typo
* Overhaul graph viz
Makes the scopes pointing into the graph being build more visually appealing.
Constants are a printed with just the constant value.
* Fix control edge color
* Fix missing grouping operator parse
Add a parens test.
Shorten names 'Identifier' to 'Id'
_lexer.match -> match
require() passes a Node thru, so can be flow-coded.
Uniform syntax error messages.
Handy Lexer.toString for debugging.
Drop Optional for null returns; less total code; less objects; less confusion.
camelCase some fcns.
* All parser helpers return Node, not void.
Drop _ret. parseBlock and parseStatement now the same.
* CLosely align chap2 and chap3 parsers
Mostly whitespace aligned; dragged a few functions around to make more sense.
I think the diff from Ch2 and Ch3 is down a few differences about what is a statement, plus all the symbol stuff for scopes and variables.
* Add examples illustrating the symbol table creation.
* Update docs and comments
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Co-authored-by: Cliff Click <cliffc@acm.org>
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