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package compiler
import (
"jinx/pkg/lang/ast"
"jinx/pkg/lang/vm/code"
)
type Compiler struct {
ast ast.Program
builder code.Builder
}
func New(ast ast.Program) *Compiler {
return &Compiler{
ast: ast,
builder: code.NewBuilder(),
}
}
func (comp *Compiler) Compile() (code.Code, error) {
for _, stmt := range comp.ast.Stmts {
if stmt.Kind == ast.StmtKindEmpty {
continue
}
if stmt.Kind != ast.StmtKindExpr {
panic("statements other than expressions and empties not implemented")
}
expr := stmt.Value.(ast.StmtExpr).Value
if err := comp.compileExpr(expr); err != nil {
return code.Code{}, err
}
}
return comp.builder.Build(), nil
}
func (comp *Compiler) compileExpr(expr ast.Expr) error {
switch expr.Kind {
case ast.ExprKindBinary:
return comp.compileBinaryExpr(expr.Value.(ast.ExprBinary))
case ast.ExprKindUnary:
return comp.compileUnaryExpr(expr.Value.(ast.ExprUnary))
case ast.ExprKindCall:
return comp.compileCallExpr(expr.Value.(ast.ExprCall))
case ast.ExprKindSubscription:
return comp.compileSubscriptionExpr(expr.Value.(ast.ExprSubscription))
case ast.ExprKindGroup:
return comp.compileGroupExpr(expr.Value.(ast.ExprGroup))
case ast.ExprKindFnLit:
panic("not implemented")
case ast.ExprKindArrayLit:
panic("not implemented")
case ast.ExprKindIdent:
panic("not implemented")
case ast.ExprKindIntLit:
return comp.compileIntLitExpr(expr.Value.(ast.ExprIntLit))
case ast.ExprKindFloatLit:
return comp.compileFloatLitExpr(expr.Value.(ast.ExprFloatLit))
case ast.ExprKindStringLit:
return comp.compileStringLitExpr(expr.Value.(ast.ExprStringLit))
case ast.ExprKindBoolLit:
return comp.compileBoolLitExpr(expr.Value.(ast.ExprBoolLit))
case ast.ExprKindNullLit:
return comp.compileNullLitExpr(expr.Value.(ast.ExprNullLit))
case ast.ExprKindThis:
panic("not implemented")
default:
panic("unknown expression kind")
}
}
func (comp *Compiler) compileBinaryExpr(expr ast.ExprBinary) error {
if err := comp.compileExpr(expr.Right); err != nil {
return err
}
if err := comp.compileExpr(expr.Left); err != nil {
return err
}
switch expr.Op {
case ast.BinOpPlus:
comp.builder.AppendOp(code.OpAdd)
case ast.BinOpMinus:
comp.builder.AppendOp(code.OpSub)
case ast.BinOpStar:
// comp.builder.AppendOp(code.OpMul)
panic("not implemented")
case ast.BinOpSlash:
// comp.builder.AppendOp(code.OpDiv)
panic("not implemented")
case ast.BinOpPercent:
// comp.builder.AppendOp(code.OpMod)
panic("not implemented")
case ast.BinOpAssign:
panic("not implemented")
case ast.BinOpEq:
// comp.builder.AppendOp(code.OpEq)
panic("not implemented")
case ast.BinOpNeq:
// comp.builder.AppendOp(code.OpNeq)
panic("not implemented")
case ast.BinOpLt:
// comp.builder.AppendOp(code.OpLt)
panic("not implemented")
case ast.BinOpLte:
comp.builder.AppendOp(code.OpLte)
case ast.BinOpGt:
// comp.builder.AppendOp(code.OpGt)
panic("not implemented")
case ast.BinOpGte:
// comp.builder.AppendOp(code.OpGte)
panic("not implemented")
default:
panic("unknown binary operator")
}
return nil
}
func (comp *Compiler) compileUnaryExpr(expr ast.ExprUnary) error {
if err := comp.compileExpr(expr.Value); err != nil {
return err
}
switch expr.Op {
case ast.UnOpBang:
panic("not implemented")
case ast.UnOpMinus:
panic("not implemented")
default:
panic("unknown unary operator")
}
return nil
}
func (comp *Compiler) compileCallExpr(expr ast.ExprCall) error {
for i := len(expr.Args) - 1; i >= 0; i-- {
if err := comp.compileExpr(expr.Args[i]); err != nil {
return err
}
}
if err := comp.compileExpr(expr.Callee); err != nil {
return err
}
comp.builder.AppendOp(code.OpCall)
comp.builder.AppendInt(int64(len(expr.Args)))
return nil
}
func (comp *Compiler) compileSubscriptionExpr(expr ast.ExprSubscription) error {
if err := comp.compileExpr(expr.Key); err != nil {
return err
}
if err := comp.compileExpr(expr.Obj); err != nil {
return err
}
comp.builder.AppendOp(code.OpIndex)
return nil
}
func (comp *Compiler) compileGroupExpr(expr ast.ExprGroup) error {
return comp.compileExpr(expr.Value)
}
func (comp *Compiler) compileIntLitExpr(expr ast.ExprIntLit) error {
comp.builder.AppendOp(code.OpPushInt)
comp.builder.AppendInt(int64(expr.Value))
return nil
}
func (comp *Compiler) compileFloatLitExpr(expr ast.ExprFloatLit) error {
comp.builder.AppendOp(code.OpPushFloat)
comp.builder.AppendFloat(expr.Value)
return nil
}
func (comp *Compiler) compileStringLitExpr(expr ast.ExprStringLit) error {
comp.builder.AppendOp(code.OpPushString)
comp.builder.AppendString(expr.Value)
return nil
}
func (comp *Compiler) compileBoolLitExpr(expr ast.ExprBoolLit) error {
if expr.Value {
comp.builder.AppendOp(code.OpPushTrue)
} else {
comp.builder.AppendOp(code.OpPushFalse)
}
return nil
}
func (comp *Compiler) compileNullLitExpr(expr ast.ExprNullLit) error {
comp.builder.AppendOp(code.OpPushNull)
return nil
}
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