feat(lang): add if/else control flow (V2 Tier 2b)#12
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Enables conditional geometry in SCAD scripts:
show = 1;
if (show) sphere(r = 5); else cube([4,4,4]);
if (r > 10) { sphere(r=r); cylinder(h=r, r=2); }
Changes:
- Token.h: If, Else token kinds
- Lexer.cpp: "if", "else" keywords
- AST.h: IfNode (condition ExprPtr, thenChildren, elseChildren);
added to AstNode variant with makeIf() helper
- Parser.h/cpp: parseIf() — condition expression, then/else via
parseBody(); chained else-if works naturally since if is a node
- CsgEvaluator.h/cpp: evalIf() — evaluates condition via
Interpreter, walks live branch, wraps multi-child results in
a union (same pattern as transform); inherits outer xform
- Tests: 14 new tests across lexer, parser, and CSG evaluator
(108 total, 631 assertions)
- tests/if_else_test.scad: 6 visual scenes
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Enables conditional geometry in SCAD scripts:
show = 1;
if (show) sphere(r = 5); else cube([4,4,4]);
if (r > 10) { sphere(r=r); cylinder(h=r, r=2); }
Changes: