Change AICode Safety Error to be a Parsing Error

src/code_generation.jl

@@ -16,7 +16,7 @@
 abstract type AbstractCodeBlock end
 
 """
-    AICode(code::AbstractString; safe_eval::Bool=false, prefix::AbstractString="", suffix::AbstractString="")
+    AICode(code::AbstractString; auto_eval::Bool=true, safe_eval::Bool=false, prefix::AbstractString="", suffix::AbstractString="")
 
 A mutable structure representing a code block (received from the AI model) with automatic parsing, execution, and output/error capturing capabilities.
 
@@ -44,6 +44,7 @@ See also: `PromptingTools.extract_code_blocks`, `PromptingTools.eval!`
 - `error::Union{Nothing, Exception}`: Any exception raised during the execution of the code block.
 
 # Keyword Arguments
+- `auto_eval::Bool`: If set to `true`, the code block is automatically parsed and evaluated upon instantiation. Defaults to `true`.
 - `safe_eval::Bool`: If set to `true`, the code block checks for package operations (e.g., installing new packages) and missing imports, and then evaluates the code inside a bespoke scratch module. This is to ensure that the evaluation does not alter any user-defined variables or the global state. Defaults to `false`.
 - `prefix::AbstractString`: A string to be prepended to the code block before parsing and evaluation.
   Useful to add some additional code definition or necessary imports. Defaults to an empty string.
@@ -100,11 +101,13 @@ eval(code.expression)
 end
 # Eager evaluation if instantiated with a string
 function (CB::Type{T})(md::AbstractString;
+        auto_eval::Bool = true,
         safe_eval::Bool = true,
         prefix::AbstractString = "",
         suffix::AbstractString = "") where {T <: AbstractCodeBlock}
     cb = CB(; code = md)
-    eval!(cb; safe_eval, prefix, suffix)
+    auto_eval && eval!(cb; safe_eval, prefix, suffix)
+    return cb
 end
 Base.isvalid(cb::AbstractCodeBlock) = cb.success == true
 function Base.copy(cb::AbstractCodeBlock)
@@ -331,14 +334,23 @@ function eval!(cb::AbstractCodeBlock;
         prefix::AbstractString = "",
         suffix::AbstractString = "")
     (; code) = cb
+    # reset
+    cb.success = nothing
+    cb.error = nothing
+    cb.expression = nothing
+    cb.output = nothing
     code_extra = string(prefix, "\n", code, "\n", suffix)
-    ## Safety checks on `code` only
+    ## Safety checks on `code` only -- treat it as a parsing failure
     if safe_eval
-        detect_pkg_operation(code) &&
-            throw(error("Error: Use of package manager (`Pkg.*`) detected! Please verify the safety of the code or disable the safety check (`safe_eval=false`)"))
         detected, missing_packages = detect_missing_packages(extract_julia_imports(code))
-        detected &&
-            throw(error("Error: Failed package import. Missing packages: $(join(string.(missing_packages),", ")). Please add them or disable the safety check (`safe_eval=false`)"))
+        if detect_pkg_operation(code) || detected
+            cb.success = false
+            detect_pkg_operation(code) &&
+                (cb.error = ErrorException("Safety Error: Use of package manager (`Pkg.*`) detected! Please verify the safety of the code or disable the safety check (`safe_eval=false`)"))
+            detected &&
+                (cb.error = ErrorException("Safety Error: Failed package import. Missing packages: $(join(string.(missing_packages),", ")). Please add them or disable the safety check (`safe_eval=false`)"))
+            return cb
+        end
     end
     ## Parse into an expression
     try

test/code_generation.jl

@@ -203,12 +203,16 @@ end
 @testset "eval! kwargs" begin
     ## Safe Eval == true mode
     # package that is not available
-    cb = AICode(; code = "using ExoticPackage123")
-    @test_throws Exception eval!(cb)
-    @test_throws "ExoticPackage123" eval!(cb)
+    cb = AICode(; code = "using ExoticPackage123") |> eval!
+    @test cb.error isa Exception
+    @test occursin("Safety Error", cb.error.msg)
+    @test occursin("ExoticPackage123", cb.error.msg)
     # Pkg operations
-    cb = AICode(; code = "Pkg.activate(\".\")")
-    @test_throws Exception eval!(cb)
+    cb = AICode(; code = "Pkg.activate(\".\")") |> eval!
+    @test cb.error isa Exception
+    @test occursin("Safety Error", cb.error.msg)
+    @test occursin("Use of package manager ", cb.error.msg)
+
     # Evaluate inside a gensym'd module
     cb = AICode(; code = "a=1") |> eval!
     @test occursin("SafeCustomModule", string(cb.output))
@@ -251,6 +255,17 @@ end
         @test cb.output.a == 1
     end
 
+    # Test auto-eval=false
+    let cb = AICode("""
+        println("Hello")
+        a=1
+        """; auto_eval = false)
+        # eval! is automatic
+        @test isnothing(cb.expression)
+        @test isnothing(cb.error)
+        @test cb.success == nothing
+    end
+
     # From AI Message
     let msg = AIMessage("""
 ```julia