Created
October 16, 2017 13:22
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Visualizing scala code diff in scala code (result is compiling Scala code with diffs annotated in comments)
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| // Build Scala source code | |
| val tree = q""" | |
| object Test { | |
| val a = 2 + 5 | |
| def f(b: String) = { b + a.toString } | |
| } | |
| """ | |
| val src = List(TreeNode(tree)) | |
| // Build Scala target code | |
| val tree2 = q""" | |
| object Test { | |
| val b = 3 + 4 | |
| def g(b: String) = { c + a.toString } | |
| } | |
| """ | |
| val target = List(TreeNode(tree2)) | |
| // Compute src & target diffs | |
| val diff = Diff(src, target) | |
| /* gives this big structure | |
| * diff: Cpy(ObjectType(Defn.Object),Cpy(TreeListFieldLabel(mods,0),Cpy(SimpleFieldLabel(name),Cpy(ValueLabel(TreeNode(Test)),Cpy(SimpleFieldLabel(templ),Cpy(ObjectType(Template),Cpy(TreeListFieldLabel(early,0),Cpy(TreeListFieldLabel(inits,0),Cpy(SimpleFieldLabel(self),Cpy(ValueLabel(TreeNode(_)),Cpy(TreeListFieldLabel(stats,2),Cpy(ObjectType(Defn.Val),Cpy(TreeListFieldLabel(mods,0),Cpy(TreeListFieldLabel(pats,1),Cpy(ObjectType(Pat.Var),Cpy(SimpleFieldLabel(name),Del(ValueLabel(TreeNode(a)),Ins(ValueLabel(TreeNode(b)),Cpy(TreeOptionFieldLabel(decltpe,false),Cpy(SimpleFieldLabel(rhs),Cpy(ObjectType(Term.ApplyInfix),Cpy(SimpleFieldLabel(lhs),Del(ValueLabel(TreeNode(2)),Ins(ValueLabel(TreeNode(3)),Cpy(SimpleFieldLabel(op),Cpy(ValueLabel(TreeNode(+)),Cpy(TreeListFieldLabel(targs,0),Cpy(TreeListFieldLabel(args,1),Del(ValueLabel(TreeNode(5)),Ins(ValueLabel(TreeNode(4)),Cpy(ObjectType(Defn.Def),Cpy(TreeListFieldLabel(mods,0),Cpy(SimpleFieldLabel(name),Del(ValueLabel(TreeNode(f)),Ins(ValueLabel(TreeNode(g)),Cpy(TreeListFieldLabel(tparams,0),Cpy(TreeListListFieldLabel(paramss,1),Cpy(TreeListFieldLabel(paramss,1),Cpy(ValueLabel(TreeNode(b: String)),Cpy(TreeOptionFieldLabel(decltpe,false),Cpy(SimpleFieldLabel(body),Cpy(ObjectType(Term.Block),Cpy(TreeListFieldLabel(stats,1),Cpy(ObjectType(Term.ApplyInfix),Cpy(SimpleFieldLabel(lhs),Del(ValueLabel(TreeNode(b)),Ins(ValueLabel(TreeNode(c)),Cpy(SimpleFieldLabel(op),Cpy(ValueLabel(TreeNode(+)),Cpy(TreeListFieldLabel(targs,0),Cpy(TreeListFieldLabel(args,1),Cpy(ValueLabel(TreeNode(a.toString)),End)))))))))))))))))))))))))))))))))))))))))))))))))))) | |
| */ | |
| // Visualises Diff | |
| DiffSyntax(dialects.Scala212)(basicDiff) | |
| // gives | |
| object Test { | |
| val /*REP[Term.Name:a] BY*/ b = /*REP[Lit.Int:2] BY*/ 3 + /*REP[Lit.Int:5] BY*/ 4 | |
| def /*REP[Term.Name:f] BY*/ g(b: String) = { | |
| /*REP[Term.Name:b] BY*/ c + a.toString | |
| } | |
| } |
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