82 lines
1.6 KiB
Go
82 lines
1.6 KiB
Go
package main
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import (
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"fmt"
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"strings"
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)
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type AstStringer struct {
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str strings.Builder
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}
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func (as AstStringer) String(stmts []Stmt) string {
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for _, stmt := range stmts {
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stmt.accept(&as)
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}
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return as.str.String()
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}
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func (as *AstStringer) visitBinary(b *Binary) any {
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as.str.WriteString("(")
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as.str.WriteString(b.op.lexeme)
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as.str.WriteString(" ")
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b.left.accept(as)
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as.str.WriteString(" ")
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b.right.accept(as)
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as.str.WriteString(")")
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return nil
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}
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func (as *AstStringer) visitLiteral(l *Literal) any {
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as.str.WriteString(fmt.Sprintf("%v", l.value))
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return nil
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}
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func (as *AstStringer) visitGrouping(g *Grouping) any {
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as.str.WriteString("(group ")
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g.expression.accept(as)
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as.str.WriteString(")")
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return nil
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}
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func (as *AstStringer) visitUnary(u *Unary) any {
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as.str.WriteString(fmt.Sprintf("(%s ", u.op.lexeme))
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u.right.accept(as)
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as.str.WriteString(")")
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return nil
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}
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func (as *AstStringer) visitVariable(va *Variable) any {
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as.str.WriteString(va.name.lexeme)
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return nil
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}
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func (as *AstStringer) visitAssignment(a *Assign) any {
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as.str.WriteString(fmt.Sprintf("(= %s ", a.variable.lexeme))
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a.value.accept(as)
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as.str.WriteString(")")
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return nil
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}
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func (as *AstStringer) visitPrintStmt(p *PrintStmt) {
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as.str.WriteString("(print ")
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p.val.accept(as)
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as.str.WriteString(")")
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}
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func (as *AstStringer) visitExprStmt(se *ExprStmt) {
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se.expr.accept(as)
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}
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func (as *AstStringer) visitVarStmt(vs *VarStmt) {
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if vs.initializer != nil {
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as.str.WriteString(fmt.Sprintf("(var %v ", vs.name.literal))
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vs.initializer.accept(as)
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as.str.WriteString(")")
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} else {
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as.str.WriteString(fmt.Sprintf("(var %v)", vs.name.literal))
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}
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}
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