41 lines
615 B
Go
41 lines
615 B
Go
package main
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type StmtVisitor interface {
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visitPrintStmt(p *PrintStmt)
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visitExprStmt(es *ExprStmt)
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visitVarStmt(v *VarStmt)
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}
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type Stmt interface {
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stmt()
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accept(v StmtVisitor)
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}
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type PrintStmt struct {
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val Expr
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}
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type ExprStmt struct {
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expr Expr
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}
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type VarStmt struct {
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name Token
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initializer Expr
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}
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func (p *PrintStmt) stmt() {}
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func (es *ExprStmt) stmt() {}
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func (vs *VarStmt) stmt() {}
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func (p *PrintStmt) accept(v StmtVisitor) {
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v.visitPrintStmt(p)
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}
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func (se *ExprStmt) accept(v StmtVisitor) {
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v.visitExprStmt(se)
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}
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func (vs *VarStmt) accept(v StmtVisitor) {
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v.visitVarStmt(vs)
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}
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