156 lines
4.6 KiB
Markdown
156 lines
4.6 KiB
Markdown
- [x] downgrade stage
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- [ ] resolve stage
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- [ ] dynamic attr resolution
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- [ ] import resolution
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- [ ] static path resolution
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- [ ] eval stage
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- [ ] dynamic path resolution
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- [ ] graph update
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- [ ] stack storage
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阻拦变量解析的是 `with import` 而不是一般的 `with`
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解析阶段可以解决除涉及非字符串常量拼接路径导入之外的问题
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静态分析图与求值期图分离，动态生成求值期图
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依赖类型：
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1. 强依赖 (x!)
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- builtins.toString x => x!
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- x + y => x! y!
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- { x = 1; ${sym} = 2; } => sym!
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2. 弱依赖 a.k.a. thunk (x?)
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- builtins.seq x y => x! y?
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3. 递归依赖 (x!!)
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- builtins.deepSeq x y => x!! y?
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e.g.
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- let a? = { inherit a?; }; in a! => a!
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- a! => { a = <THUNK> }
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- f: let x? = f! x?; in x! => f! x!
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- let ret? = (self: { x? = 1; y? = self.x! + 1; }) ret?; in ret.y! => ret! x! y!
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工作流程：
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1. string -> AST
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2. AST -> HIR (alloc ExprId)
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3. HIR -> LIR (resolve var, build graph)
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4. LIR -> Value
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```mermaid
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flowchart TD
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Start([Context::eval]) --> Eval[EvalContext::eval]
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Eval --> AddNode[add node to graph]
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AddNode --> CheckType{check expression type}
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CheckType -->|AttrSet| A_EvalKeys[eval keys]
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A_EvalKeys --> A_Construct[construct attrset]
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A_Construct --> A_Return[return attrset]
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A_Return --> End
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A_EvalKeys -.->|eval| Eval
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CheckType -->|List| L_Construct[construct list]
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L_Construct --> L_Return[return list]
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L_Return --> End
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CheckType -->|HasAttr| HA_ForceAttrSet[force attrset]
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HA_ForceAttrSet --> HA_ForceAttrPath[force attrpath]
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HA_ForceAttrPath --> HA_Return[return bool]
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HA_Return --> End
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HA_ForceAttrSet -.->|eval| Eval
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HA_ForceAttrPath -.->|eval| Eval
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CheckType -->|BinOp| B_ForceLeft[force left operand]
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B_ForceLeft --> B_ForceRight[force right operand]
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B_ForceRight --> B_Apply[apply operator]
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B_Apply --> B_Return[return value]
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B_Return --> End
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B_ForceLeft -.->|eval| Eval
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B_ForceRight -.->|eval| Eval
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CheckType -->|UnOp| U_ForceOperand[force operand]
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U_ForceOperand --> U_Apply[apply operator]
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U_Apply --> U_Return[return value]
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U_Return --> End
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U_ForceOperand -.->|eval| Eval
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CheckType -->|Select| S_ForceAttrSet[force attrset]
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S_ForceAttrSet --> S_ForceAttrPath[force attrpath]
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S_ForceAttrPath --> S_CallEval[call eval on value]
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S_CallEval --> S_Return[return value]
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S_Return --> End
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S_ForceAttrSet -.->|eval| Eval
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S_ForceAttrPath -.->|eval| Eval
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S_CallEval -.-> Eval
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CheckType -->|If| I_ForceCond[force condition]
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I_ForceCond --> I_Cond{condition}
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I_Cond -->|true| I_ForceConsq[force consequence]
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I_Cond -->|false| I_ForceAlter[force alternative]
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I_ForceConsq --> I_CallEvalConsq[call eval on consequence]
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I_ForceAlter --> I_CallEvalAlter[call eval on alternative]
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I_CallEvalConsq --> I_ReturnConsq[return value]
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I_CallEvalAlter --> I_ReturnAlter[return value]
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I_ReturnConsq --> End
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I_ReturnAlter --> End
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I_ForceCond -.->|eval| Eval
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I_ForceConsq -.->|eval| Eval
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I_ForceAlter -.->|eval| Eval
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I_CallEvalConsq -.-> Eval
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I_CallEvalAlter -.-> Eval
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CheckType -->|Call| C_RegArg[register argument]
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C_RegArg --> C_ForceBody[force body]
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C_ForceBody --> C_CallEval[call eval on body]
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C_CallEval --> C_Return[return value]
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C_Return --> End
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C_ForceBody -.->|eval| Eval
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C_CallEval -.-> Eval
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CheckType -->|With| W_EnterWith[enter with]
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W_EnterWith --> W_ForceBody[force body]
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W_ForceBody --> W_CallEval[call eval on body]
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W_CallEval --> W_Return[return value]
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W_Return --> End
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W_ForceBody -.->|eval| Eval
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W_CallEval -.-> Eval
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CheckType -->|Assert| As_ForceCond[force condition]
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As_ForceCond --> As_Cond{condition}
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As_Cond -->|true| As_ForceBody[force body]
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As_Cond -->|false| As_Throw[throw Catchable]
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As_ForceBody --> As_CallEval[call eval on body]
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As_CallEval --> End
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As_ForceCond -.->|eval| Eval
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As_ForceBody -.->|eval| Eval
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As_CallEval -.-> Eval
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CheckType -->|ConcatStrings| CS_ForceParts[force string parts]
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CS_ForceParts --> CS_Construct[construct string]
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CS_Construct --> End
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CS_ForceParts -.->|eval| Eval
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CheckType -->|Const| Co_Return[return constant]
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Co_Return --> End
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CheckType -->|Str| St_Return[return string]
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St_Return --> End
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CheckType -->|Var| V_Lookup[lookup var]
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V_Lookup --> V_Return[return value]
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V_Return --> End
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CheckType -->|Arg| Ar_Lookup[lookup arg]
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Ar_Lookup --> End
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CheckType -->|Func| F_Construct[construct function]
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F_Construct --> End
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CheckType -->|StrictRef| SR_Eval[eval referenced expr]
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SR_Eval --> Eval
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CheckType -->|LazyRef| LR_Resolve[resolve dynamic variable lookups of the referenced expr]
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LR_Resolve --> LR_Contruct[construct lazy reference]
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LR_Contruct --> End
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End([return result])
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```
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