From df5294e88cc409d7adf3e10666bfcb40e34472b9 Mon Sep 17 00:00:00 2001 From: Dibyendu Majumdar Date: Sun, 1 Oct 2023 18:01:54 +0100 Subject: Chapter 3 - add vars and lexical scope. (#7) * 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 --------- Co-authored-by: Cliff Click --- chapter03/docs/03-graph1.svg | 131 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 chapter03/docs/03-graph1.svg (limited to 'chapter03/docs/03-graph1.svg') diff --git a/chapter03/docs/03-graph1.svg b/chapter03/docs/03-graph1.svg new file mode 100644 index 00000000..364cd42c --- /dev/null +++ b/chapter03/docs/03-graph1.svg @@ -0,0 +1,131 @@ + + + + + + +chapter03 + + +cluster_Nodes + + + +cluster_0 + + + +cluster_1 + + + + +Start1 + +Start + + + +Con_2 + +#1 + + + +Con_2->Start1 + + + + + +Con_3 + +#2 + + + +Con_3->Start1 + + + + + +Con_5 + +#3 + + + +Con_5->Start1 + + + + + +Add6 + +Add + + + +Add6->Con_2 + + + + + +Add6->Con_5 + + + + + +scope0 + + +0 + +a + +b + +c + + + +scope0:scope0_a->Con_2 + + + + + +scope0:scope0_b->Con_3 + + + + + +scope0:scope0_c->Add6 + + + + + +scope1 + + +1 + +b + + + +scope1:scope1_b->Con_5 + + + + + -- cgit v1.2.3