Improve Zig AST developer experience
- Convert string-based type discrimination to type-safe enums - ContainerKind (struct, enum, union, opaque) - LiteralKind (int, float, string, char) - LoopKind (for, while) - Remove duplicate AST nodes (consolidated init lists, removed unused types) - Add comprehensive helper functions for all AST constructions - Implement formatters for all AST nodes (expressions, statements, types) - Add typed literal constructors: IntLit, FloatLit, StringLit, CharLit - Improve documentation and add deprecation notices This makes the AST more intuitive and type-safe for developers.
This commit is contained in:
parent
258b3c8e9b
commit
2af696078d
@ -2,9 +2,10 @@
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package zig
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// Root is the top-level node of a Zig source file.
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// It represents the entire compilation unit.
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type Root struct {
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ContainerDocComment DocComment // //! Doc Comment (optional)
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ContainerMembers []*ContainerMember
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ContainerDocComment DocComment // Module-level doc comment using //!
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ContainerMembers []*ContainerMember // Top-level declarations and fields
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}
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type ContainerMember struct {
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@ -111,11 +112,21 @@ type ParamDecl struct {
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Type TypeExpr // 'anytype' if empty
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}
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// ContainerKind represents the kind of container (struct, enum, union, opaque).
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type ContainerKind int
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const (
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ContainerStruct ContainerKind = iota
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ContainerEnum
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ContainerUnion
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ContainerOpaque
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)
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// ContainerDecl represents a struct, enum, union, or opaque declaration.
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type ContainerDecl struct {
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Extern bool
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Packed bool
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Kind string // "struct", "enum", "union", "opaque"
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Kind ContainerKind
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TagType TypeExpr // Optional (for enum/union)
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Fields []*ContainerMember
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DocComment DocComment
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@ -226,10 +237,18 @@ type ContinueStmt struct {
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func (*ContinueStmt) isStmt() {}
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// LoopKind represents the kind of loop (for or while).
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type LoopKind int
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const (
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LoopFor LoopKind = iota
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LoopWhile
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)
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// LoopStmt represents a for/while loop statement.
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type LoopStmt struct {
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Inline bool // True if 'inline' is present
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Kind string // "for" or "while"
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Kind LoopKind // For or While
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Prefix LoopPrefix // ForPrefix or WhilePrefix
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Body Stmt // Loop body
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Else Stmt // Optional else branch
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@ -331,9 +350,19 @@ type Identifier struct {
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Name string // The identifier name
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}
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// LiteralKind represents the kind of literal.
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type LiteralKind int
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const (
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LiteralInt LiteralKind = iota
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LiteralFloat
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LiteralString
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LiteralChar
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)
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// Literal represents a literal value (int, float, string, char).
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type Literal struct {
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Kind string // "int", "float", "string", "char"
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Kind LiteralKind
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Value string // The literal value as a string
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}
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@ -391,15 +420,14 @@ type NosuspendExpr struct {
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Expr Expr // The expression to evaluate with nosuspend
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}
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// ContinueExpr represents a 'continue' expression.
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type ContinueExpr struct {
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Label string // Optional label
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}
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// Expr is any expression.
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// This is an empty interface to allow maximum flexibility.
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// Consider using type switches when working with expressions.
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type Expr interface{}
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// TypeExpr is any type expression.
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// This is an empty interface to allow maximum flexibility.
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// Consider using type switches when working with type expressions.
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type TypeExpr interface{}
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// PrefixTypeExpr represents a type with a string prefix. Examples include optionals and pointers.
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@ -500,43 +528,14 @@ type AwaitExpr struct {
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// UnreachableExpr represents the 'unreachable' keyword.
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type UnreachableExpr struct{}
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// EmptyInitListExpr represents an empty initializer list '{}'.
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type EmptyInitListExpr struct{}
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// PositionalInitListExpr represents a positional initializer list '{expr, ...}'.
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type PositionalInitListExpr struct {
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Values []Expr // Expressions in order
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}
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// FieldInitListExpr represents a field initializer list '{.field = expr, ...}'.
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type FieldInitListExpr struct {
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Fields []*FieldInit // Field initializers
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}
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// SwitchProngPayload represents a switch prong payload (|*x, y|).
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type SwitchProngPayload struct {
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Pointer bool
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Names []string
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}
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// SwitchProngCase represents a single case in a switch prong.
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type SwitchProngCase struct {
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Expr Expr // The case expression
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To Expr // Optional, for ranges
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}
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// SwitchProngFull represents a full switch prong with cases and payload.
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type SwitchProngFull struct {
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Inline bool
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Cases []*SwitchProngCase // One or more cases
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Payload *SwitchProngPayload // Optional
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Expr Expr // The result expression
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}
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// SwitchElseProng represents an 'else' prong in a switch.
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type SwitchElseProng struct {
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Expr Expr // The result expression
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}
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// Note: The following types were removed as they were duplicates:
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// - EmptyInitListExpr (use InitListExpr with Empty=true)
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// - PositionalInitListExpr (use InitListExpr with Values)
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// - FieldInitListExpr (use InitListExpr with Fields)
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// - SwitchProngPayload (use Payload)
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// - SwitchProngCase (use SwitchCase)
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// - SwitchProngFull (use SwitchProng)
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// - SwitchElseProng (use SwitchProng with SwitchCase.IsElse=true)
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// VarPattern represents a variable pattern for destructuring or multiple variable declarations.
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type VarPattern struct {
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@ -5,9 +5,24 @@ func Id(name string) *Identifier {
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return &Identifier{Name: name}
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}
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// Lit creates a literal expression.
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func Lit(kind, value string) *Literal {
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return &Literal{Kind: kind, Value: value}
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// IntLit creates an integer literal.
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func IntLit(value string) *Literal {
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return &Literal{Kind: LiteralInt, Value: value}
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}
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// FloatLit creates a float literal.
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func FloatLit(value string) *Literal {
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return &Literal{Kind: LiteralFloat, Value: value}
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}
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// StringLit creates a string literal.
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func StringLit(value string) *Literal {
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return &Literal{Kind: LiteralString, Value: value}
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}
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// CharLit creates a character literal.
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func CharLit(value string) *Literal {
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return &Literal{Kind: LiteralChar, Value: value}
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}
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// FieldAccess creates a field access expression.
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@ -108,7 +123,7 @@ func Param(name string, typ TypeExpr) *ParamDecl {
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// StructDecl creates a struct declaration with the given fields/members.
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func StructDecl(fields ...*ContainerMember) *ContainerDecl {
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return &ContainerDecl{
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Kind: "struct",
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Kind: ContainerStruct,
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Fields: fields,
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}
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}
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@ -163,13 +178,27 @@ func Defer(stmt Stmt) *DeferStmt {
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// ForLoop creates a for loop statement.
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func ForLoop(args []ForArg, payload *Payload, body Stmt, els Stmt) *LoopStmt {
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return &LoopStmt{
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Kind: "for",
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Kind: LoopFor,
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Prefix: &ForPrefix{Args: args, Payload: payload},
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Body: body,
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Else: els,
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}
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}
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// WhileLoop creates a while loop statement.
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func WhileLoop(cond Expr, continueExpr Expr, payload *Payload, body Stmt, els Stmt) *LoopStmt {
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return &LoopStmt{
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Kind: LoopWhile,
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Prefix: &WhilePrefix{
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Cond: cond,
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Continue: continueExpr,
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Payload: payload,
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},
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Body: body,
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Else: els,
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}
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}
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// ForArg creates a for loop argument.
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func ForArgExpr(expr Expr) ForArg {
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return ForArg{Expr: expr}
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@ -229,3 +258,113 @@ func Unreachable() *UnreachableExpr {
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func Test(name string, block *Block) *TestDecl {
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return &TestDecl{Name: name, Block: block}
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}
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// GroupedExpr creates a grouped (parenthesized) expression.
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func Grouped(expr Expr) *GroupedExpr {
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return &GroupedExpr{Expr: expr}
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}
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// ComptimeExpr creates a comptime expression.
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func Comptime(expr Expr) *ComptimeExpr {
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return &ComptimeExpr{Expr: expr}
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}
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// NosuspendExpr creates a nosuspend expression.
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func Nosuspend(expr Expr) *NosuspendExpr {
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return &NosuspendExpr{Expr: expr}
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}
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// SliceType creates a slice type ([]T).
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func SliceType(elem TypeExpr) *SliceTypeExpr {
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return &SliceTypeExpr{Elem: elem}
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}
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// IfExpression creates an if expression.
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func IfExpression(cond Expr, then, els Expr) *IfExpr {
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return &IfExpr{Cond: cond, Then: then, Else: els}
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}
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// IfExpressionWithPayload creates an if expression with a payload.
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func IfExpressionWithPayload(cond Expr, payload *Payload, then, els Expr) *IfExpr {
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return &IfExpr{Cond: cond, Payload: payload, Then: then, Else: els}
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}
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// SwitchExpression creates a switch expression.
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func SwitchExpression(cond Expr, prongs ...*SwitchProng) *SwitchExpr {
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return &SwitchExpr{Cond: cond, Prongs: prongs}
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}
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// EnumDecl creates an enum declaration.
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func EnumDecl(tagType TypeExpr, fields ...*ContainerMember) *ContainerDecl {
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return &ContainerDecl{
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Kind: ContainerEnum,
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TagType: tagType,
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Fields: fields,
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}
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}
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// UnionDecl creates a union declaration.
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func UnionDecl(tagType TypeExpr, fields ...*ContainerMember) *ContainerDecl {
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return &ContainerDecl{
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Kind: ContainerUnion,
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TagType: tagType,
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Fields: fields,
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}
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}
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// OpaqueDecl creates an opaque declaration.
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func OpaqueDecl() *ContainerDecl {
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return &ContainerDecl{
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Kind: ContainerOpaque,
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}
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}
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// AsyncExpr creates an async expression.
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func Async(expr Expr) *AsyncExpr {
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return &AsyncExpr{Expr: expr}
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}
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// AwaitExpr creates an await expression.
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func Await(expr Expr) *AwaitExpr {
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return &AwaitExpr{Expr: expr}
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}
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// ResumeExpr creates a resume expression.
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func Resume(expr Expr) *ResumeExpr {
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return &ResumeExpr{Expr: expr}
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}
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// DotAsterisk creates a .* expression (pointer dereference).
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func DotAsterisk(receiver Expr) *DotAsteriskExpr {
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return &DotAsteriskExpr{Receiver: receiver}
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}
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// DotQuestion creates a .? expression (optional unwrap).
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func DotQuestion(receiver Expr) *DotQuestionExpr {
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return &DotQuestionExpr{Receiver: receiver}
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}
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// ErrDefer creates an errdefer statement.
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func ErrDefer(payload *Payload, stmt Stmt) *DeferStmt {
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return &DeferStmt{ErrDefer: true, Payload: payload, Stmt: stmt}
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}
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// UsingNamespace creates a usingnamespace declaration.
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func UsingNamespace(expr Expr) *UsingNamespaceDecl {
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return &UsingNamespaceDecl{Expr: expr}
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}
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// ComptimeBlock creates a comptime block declaration.
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func ComptimeBlock(block *Block) *ComptimeDecl {
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return &ComptimeDecl{Block: block}
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}
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// InitListFields creates an init list with field initializers.
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func InitListFields(fields ...*FieldInit) *InitListExpr {
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return &InitListExpr{Fields: fields}
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}
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// FieldInitPair creates a field initializer.
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func FieldInitPair(name string, value Expr) *FieldInit {
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return &FieldInit{Name: name, Value: value}
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}
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@ -119,6 +119,14 @@ func writeDecl(f *formatter, decl Decl) {
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}
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writeBlock(f, d.Block)
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f.writef("\n")
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case *UsingNamespaceDecl:
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f.writef("usingnamespace ")
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writeExpr(f, d.Expr)
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f.writef(";\n")
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case *ComptimeDecl:
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f.writef("comptime")
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writeBlock(f, d.Block)
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f.writef("\n")
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}
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}
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@ -148,6 +156,9 @@ func writeTypeExpr(f *formatter, typ TypeExpr) {
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writeExpr(f, t.Size)
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f.writef("]")
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writeTypeExpr(f, t.Elem)
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case *SliceTypeExpr:
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f.writef("[]")
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writeTypeExpr(f, t.Elem)
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case *ErrorUnionTypeExpr:
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writeTypeExpr(f, t.ErrSet)
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f.writef("!")
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@ -241,7 +252,7 @@ func writeStmt(f *formatter, stmt Stmt) {
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}
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}
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case *LoopStmt:
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if s.Kind == "while" {
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if s.Kind == LoopWhile {
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f.writef("while (")
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if wp, ok := s.Prefix.(*WhilePrefix); ok {
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writeExpr(f, wp.Cond)
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@ -258,7 +269,7 @@ func writeStmt(f *formatter, stmt Stmt) {
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f.writef(" ")
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writeStmt(f, s.Body)
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}
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} else if s.Kind == "for" {
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} else if s.Kind == LoopFor {
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f.writef("for (")
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if fp, ok := s.Prefix.(*ForPrefix); ok {
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for i, arg := range fp.Args {
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@ -327,7 +338,7 @@ func writeStmt(f *formatter, stmt Stmt) {
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f.writeIndent()
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f.writef("}")
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}
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}
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}
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// writePayload emits a payload (|x|, |*x|, |*x, y|, etc).
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func writePayload(f *formatter, payload *Payload) {
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@ -431,7 +442,7 @@ func writeExpr(f *formatter, expr Expr) {
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f.writef(".%s", e.Field)
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case *Literal:
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switch e.Kind {
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case "string":
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case LiteralString:
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f.writef(`"%v"`, e.Value)
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default:
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f.writef("%v", e.Value)
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@ -456,11 +467,21 @@ func writeExpr(f *formatter, expr Expr) {
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}
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}
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case *ContainerDecl:
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if e.Kind == "struct" {
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switch e.Kind {
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case ContainerStruct:
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f.writef("struct ")
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writeStructBody(f, e)
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} else {
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panic("not implemented: " + e.Kind)
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case ContainerEnum:
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f.writef("enum ")
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writeStructBody(f, e)
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case ContainerUnion:
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f.writef("union ")
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writeStructBody(f, e)
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case ContainerOpaque:
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f.writef("opaque ")
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writeStructBody(f, e)
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default:
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panic("unknown container kind")
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}
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case *TryExpr:
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f.writef("try ")
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@ -489,6 +510,58 @@ func writeExpr(f *formatter, expr Expr) {
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f.indent--
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f.writeIndent()
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f.writef("}")
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case *GroupedExpr:
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f.writef("(")
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writeExpr(f, e.Expr)
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f.writef(")")
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case *ComptimeExpr:
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f.writef("comptime ")
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writeExpr(f, e.Expr)
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case *NosuspendExpr:
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f.writef("nosuspend ")
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writeExpr(f, e.Expr)
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case *AsyncExpr:
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f.writef("async ")
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writeExpr(f, e.Expr)
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case *AwaitExpr:
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f.writef("await ")
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writeExpr(f, e.Expr)
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case *ResumeExpr:
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f.writef("resume ")
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writeExpr(f, e.Expr)
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case *DotAsteriskExpr:
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writeExpr(f, e.Receiver)
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f.writef(".*")
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case *DotQuestionExpr:
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writeExpr(f, e.Receiver)
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f.writef(".?")
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case *IfExpr:
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f.writef("if (")
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writeExpr(f, e.Cond)
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f.writef(")")
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if e.Payload != nil {
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f.writef(" ")
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writePayload(f, e.Payload)
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}
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f.writef(" ")
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writeExpr(f, e.Then)
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if e.Else != nil {
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f.writef(" else ")
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writeExpr(f, e.Else)
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}
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case *SwitchExpr:
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f.writef("switch (")
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writeExpr(f, e.Cond)
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f.writef(") {\n")
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f.indent++
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for _, prong := range e.Prongs {
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f.writeIndent()
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writeSwitchProng(f, prong)
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f.writef("\n")
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}
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f.indent--
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f.writeIndent()
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f.writef("}")
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}
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}
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@ -63,7 +63,7 @@ fn main() void {
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{
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Decl: zig.DeclareGlobalVar("std", zig.Call(
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zig.Id("@import"),
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zig.Lit("string", "std"),
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zig.StringLit("std"),
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), zig.GlobalVarConst),
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},
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{
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@ -77,7 +77,7 @@ fn main() void {
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zig.FieldAccess(zig.Id("std"), "debug"),
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"print",
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),
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zig.Lit("string", `Hello, world!\n`),
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zig.StringLit(`Hello, world!\n`),
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zig.InitList(),
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),
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),
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@ -144,7 +144,7 @@ test "processData" {
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zig.ErrorUnionType(zig.Id("ProcessError"), zig.Id("i32")),
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zig.NewBlock(
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// var result: i32 = 0;
|
||||
zig.DeclareVarStmt(false, []string{"result"}, zig.Id("i32"), zig.Lit("int", "0")),
|
||||
zig.DeclareVarStmt(false, []string{"result"}, zig.Id("i32"), zig.IntLit("0")),
|
||||
// defer std.debug.print("Cleanup\n", .{});
|
||||
zig.Defer(
|
||||
zig.NewExprStmt(
|
||||
@ -153,7 +153,7 @@ test "processData" {
|
||||
zig.FieldAccess(zig.Id("std"), "debug"),
|
||||
"print",
|
||||
),
|
||||
zig.Lit("string", `Cleanup\n`),
|
||||
zig.StringLit(`Cleanup\n`),
|
||||
zig.InitList(),
|
||||
),
|
||||
),
|
||||
@ -162,7 +162,7 @@ test "processData" {
|
||||
zig.ForLoop(
|
||||
[]zig.ForArg{
|
||||
zig.ForArgExpr(zig.Id("values")),
|
||||
{Expr: zig.Lit("int", "0"), From: zig.Lit("", "")},
|
||||
{Expr: zig.IntLit("0"), From: zig.IntLit("")},
|
||||
},
|
||||
zig.PayloadNames([]string{"opt_val", "idx"}, []bool{false, false}),
|
||||
zig.NewBlockStmt(
|
||||
@ -178,8 +178,8 @@ test "processData" {
|
||||
zig.Prong(
|
||||
[]*zig.SwitchCase{
|
||||
zig.Case(
|
||||
zig.Unary("-", zig.Lit("int", "10")),
|
||||
zig.Unary("-", zig.Lit("int", "1")),
|
||||
zig.Unary("-", zig.IntLit("10")),
|
||||
zig.Unary("-", zig.IntLit("1")),
|
||||
),
|
||||
},
|
||||
nil,
|
||||
@ -193,7 +193,7 @@ test "processData" {
|
||||
// 0 => continue,
|
||||
zig.Prong(
|
||||
[]*zig.SwitchCase{
|
||||
zig.Case(zig.Lit("int", "0"), nil),
|
||||
zig.Case(zig.IntLit("0"), nil),
|
||||
},
|
||||
nil,
|
||||
zig.Continue(""),
|
||||
@ -201,12 +201,12 @@ test "processData" {
|
||||
// 1...10 => { ... }
|
||||
zig.Prong(
|
||||
[]*zig.SwitchCase{
|
||||
zig.Case(zig.Lit("int", "1"), zig.Lit("int", "10")),
|
||||
zig.Case(zig.IntLit("1"), zig.IntLit("10")),
|
||||
},
|
||||
nil,
|
||||
zig.NewBlockStmt(
|
||||
zig.If(
|
||||
zig.Binary(">", zig.Id("idx"), zig.Lit("int", "3")),
|
||||
zig.Binary(">", zig.Id("idx"), zig.IntLit("3")),
|
||||
zig.Break("", nil),
|
||||
nil,
|
||||
),
|
||||
@ -228,7 +228,7 @@ test "processData" {
|
||||
// else block
|
||||
zig.NewBlockStmt(
|
||||
zig.If(
|
||||
zig.Binary("==", zig.Id("idx"), zig.Lit("int", "0")),
|
||||
zig.Binary("==", zig.Id("idx"), zig.IntLit("0")),
|
||||
zig.Return(zig.FieldAccess(zig.Id("ProcessError"), "InvalidInput")),
|
||||
nil,
|
||||
),
|
||||
@ -241,7 +241,7 @@ test "processData" {
|
||||
// if (values[0] == null) { unreachable; }
|
||||
zig.If(
|
||||
zig.Binary("==",
|
||||
zig.Index(zig.Id("values"), zig.Lit("int", "0")),
|
||||
zig.Index(zig.Id("values"), zig.IntLit("0")),
|
||||
zig.Id("null"),
|
||||
),
|
||||
zig.NewBlockStmt(
|
||||
@ -253,7 +253,7 @@ test "processData" {
|
||||
zig.Return(zig.Id("result")),
|
||||
),
|
||||
[]*zig.ParamDecl{
|
||||
zig.Param("values", zig.ArrayType(zig.Lit("int", "5"), zig.OptionalType(zig.Id("i32")))),
|
||||
zig.Param("values", zig.ArrayType(zig.IntLit("5"), zig.OptionalType(zig.Id("i32")))),
|
||||
},
|
||||
0,
|
||||
),
|
||||
@ -265,11 +265,11 @@ test "processData" {
|
||||
zig.DeclareVarStmt(true, []string{"data"}, nil,
|
||||
&zig.InitListExpr{
|
||||
Values: []zig.Expr{
|
||||
zig.Lit("int", "5"),
|
||||
zig.Unary("-", zig.Lit("int", "3")),
|
||||
zig.Lit("int", "0"),
|
||||
zig.IntLit("5"),
|
||||
zig.Unary("-", zig.IntLit("3")),
|
||||
zig.IntLit("0"),
|
||||
zig.Id("null"),
|
||||
zig.Lit("int", "10"),
|
||||
zig.IntLit("10"),
|
||||
},
|
||||
},
|
||||
),
|
||||
@ -288,7 +288,7 @@ test "processData" {
|
||||
zig.Call(
|
||||
zig.Id("@as"),
|
||||
zig.Id("i32"),
|
||||
zig.Lit("int", "8"),
|
||||
zig.IntLit("8"),
|
||||
),
|
||||
zig.Id("result"),
|
||||
),
|
||||
@ -328,7 +328,7 @@ pub fn main() !void {
|
||||
Decl: zig.DeclareGlobalVar("std",
|
||||
zig.Call(
|
||||
zig.Id("@import"),
|
||||
zig.Lit("string", "std"),
|
||||
zig.StringLit("std"),
|
||||
),
|
||||
zig.GlobalVarConst,
|
||||
),
|
||||
@ -353,26 +353,24 @@ pub fn main() !void {
|
||||
),
|
||||
),
|
||||
// var i: i32 = 1;
|
||||
zig.DeclareVarStmt(false, []string{"i"}, zig.Id("i32"), zig.Lit("int", "1")),
|
||||
zig.DeclareVarStmt(false, []string{"i"}, zig.Id("i32"), zig.IntLit("1")),
|
||||
// while (i <= 5) : (i += 1) { ... }
|
||||
&zig.LoopStmt{
|
||||
Kind: "while",
|
||||
Prefix: &zig.WhilePrefix{
|
||||
Cond: zig.Binary("<=", zig.Id("i"), zig.Lit("int", "5")),
|
||||
Continue: zig.Binary("+=", zig.Id("i"), zig.Lit("int", "1")),
|
||||
},
|
||||
Body: zig.NewBlockStmt(
|
||||
zig.WhileLoop(
|
||||
zig.Binary("<=", zig.Id("i"), zig.IntLit("5")),
|
||||
zig.Binary("+=", zig.Id("i"), zig.IntLit("1")),
|
||||
nil,
|
||||
zig.NewBlockStmt(
|
||||
&zig.IfStmt{
|
||||
Cond: zig.Binary("==",
|
||||
zig.Binary("%", zig.Id("i"), zig.Lit("int", "2")),
|
||||
zig.Lit("int", "0"),
|
||||
zig.Binary("%", zig.Id("i"), zig.IntLit("2")),
|
||||
zig.IntLit("0"),
|
||||
),
|
||||
Then: zig.NewBlockStmt(
|
||||
zig.NewExprStmt(
|
||||
zig.Try(
|
||||
zig.Call(
|
||||
zig.FieldAccess(zig.Id("stdout"), "writeAll"),
|
||||
zig.Lit("string", `even: {d}\n`),
|
||||
zig.StringLit(`even: {d}\n`),
|
||||
zig.InitList(zig.Id("i")),
|
||||
),
|
||||
),
|
||||
@ -383,7 +381,7 @@ pub fn main() !void {
|
||||
zig.Try(
|
||||
zig.Call(
|
||||
zig.FieldAccess(zig.Id("stdout"), "writeAll"),
|
||||
zig.Lit("string", `odd: {d}\n`),
|
||||
zig.StringLit(`odd: {d}\n`),
|
||||
zig.InitList(zig.Id("i")),
|
||||
),
|
||||
),
|
||||
@ -391,7 +389,8 @@ pub fn main() !void {
|
||||
),
|
||||
},
|
||||
),
|
||||
},
|
||||
nil,
|
||||
),
|
||||
),
|
||||
nil,
|
||||
zig.FnExport,
|
||||
@ -430,7 +429,7 @@ func TestStructWithFieldsAndMethod(t *testing.T) {
|
||||
zig.NewExprStmt(
|
||||
zig.Binary("=",
|
||||
zig.FieldAccess(zig.Id("self"), "count"),
|
||||
zig.Lit("int", "0"),
|
||||
zig.IntLit("0"),
|
||||
),
|
||||
),
|
||||
),
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user