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printer.go
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394 lines (360 loc) · 8.68 KB
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package main
import (
"fmt"
"strconv"
"strings"
)
// AstPrinter implements the Visitor interface to traverse AST nodes to pretty
// print the tree.
type AstPrinter struct {
stack Stack
}
func NewAstPrinter() AstPrinter {
p := AstPrinter{Stack{}}
p.push("")
return p
}
func (p *AstPrinter) push(s string) {
p.stack.Push(s)
}
func (p AstPrinter) peek() string {
return p.stack.Peek().(string)
}
func (p *AstPrinter) pop() string {
return p.stack.Pop().(string)
}
func (p AstPrinter) VisitAddNode(n *AstAddNode) {
fmt.Println("AddNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitAndNode(n *AstAndNode) {
fmt.Println("AndNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitAssignNode(n *AstAssignNode) {
fmt.Println("AssignNode")
fmt.Println(p.peek() + "├ Name: " + n.Name)
fmt.Print(p.peek() + "╰ Expr: ")
p.push(p.peek() + " ")
n.Expr.Accept(p)
p.pop()
}
func (p AstPrinter) VisitBoolNode(n *AstBoolNode) {
fmt.Println("BoolNode")
value := strconv.FormatBool(n.Value)
fmt.Println(p.peek() + "╰ Value: " + value)
}
func (p AstPrinter) VisitCastNode(n *AstCastNode) {
fmt.Println("CastNode")
fmt.Println(p.peek() + "├ Cast: " + n.Cast)
fmt.Print(p.peek() + "╰ Term: ")
p.push(p.peek() + " ")
n.Term.Accept(p)
p.pop()
}
func (p AstPrinter) VisitDivideNode(n *AstDivideNode) {
fmt.Println("DivideNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitEqualNode(n *AstEqualNode) {
fmt.Println("EqualNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitFuncCallNode(n *AstFuncCallNode) {
fmt.Println("FuncCallNode")
fmt.Println(p.peek() + "├ Name: " + n.Name)
fmt.Print(p.peek() + "╰ Args: ")
if n.Args == nil || len(n.Args) == 0 {
fmt.Println("0x0")
return
}
p.push(p.peek() + " ")
n.Args[0].Accept(p)
for _, arg := range n.Args[1:] {
fmt.Print(p.peek())
arg.Accept(p)
}
p.pop()
}
func (p AstPrinter) VisitFuncDefNode(n *AstFuncDefNode) {
fmt.Println("FuncDefNode")
fmt.Println(p.peek() + "├ Name: " + n.Name)
fmt.Print(p.peek() + "├ Args: ")
if n.Args == nil || len(n.Args) == 0 {
fmt.Println("0x0")
} else {
fmt.Println(n.Args[0])
if len(n.Args) > 1 {
for _, arg := range n.Args[1:] {
fmt.Println(p.peek() + "│ " + arg)
}
}
}
fmt.Print(p.peek() + "╰ Body: ")
if n.Body == nil || len(n.Body) == 0 {
fmt.Println("0x0")
} else {
p.push(p.peek() + " ")
n.Body[0].Accept(p)
for _, arg := range n.Body[1:] {
fmt.Print(p.peek())
arg.Accept(p)
}
p.pop()
}
}
func (p AstPrinter) VisitGreaterEqualNode(n *AstGreaterEqualNode) {
fmt.Println("GreaterEqualNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitGreaterNode(n *AstGreaterNode) {
fmt.Println("GreaterNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitIfNode(n *AstIfNode) {
fmt.Println("IfNode")
fmt.Print(p.peek() + "├ Cond: ")
p.push(p.peek() + "│ ")
n.Cond.Accept(p)
p.pop()
fmt.Print(p.peek() + "├ Body: ")
if n.Body == nil || len(n.Body) == 0 {
fmt.Println("0x0")
} else {
p.push(p.peek() + "│ ")
n.Body[0].Accept(p)
if len(n.Body) > 1 {
for _, stmt := range n.Body[1:] {
fmt.Print(p.peek())
stmt.Accept(p)
}
}
p.pop()
}
fmt.Print(p.peek() + "╰ Else: ")
if n.Else == nil || len(n.Else) == 0 {
fmt.Println("0x0")
} else {
p.push(p.peek() + " ")
n.Else[0].Accept(p)
if len(n.Else) > 1 {
for _, stmt := range n.Else[1:] {
fmt.Print(p.peek())
stmt.Accept(p)
}
}
p.pop()
}
}
func (p AstPrinter) VisitLessEqualNode(n *AstLessEqualNode) {
fmt.Println("LessEqualNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitLessNode(n *AstLessNode) {
fmt.Println("LessNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitModuloNode(n *AstModuloNode) {
fmt.Println("ModuloNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitMultiplyNode(n *AstMultiplyNode) {
fmt.Println("MultiplyNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitNegativeNode(n *AstNegativeNode) {
fmt.Println("NegativeNode")
fmt.Print(p.peek() + "╰ Term: ")
p.push(p.peek() + " ")
n.Term.Accept(p)
p.pop()
}
func (p AstPrinter) VisitNotEqualNode(n *AstNotEqualNode) {
fmt.Println("NotEqualNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitNotNode(n *AstNotNode) {
fmt.Println("NotNode")
fmt.Print(p.peek() + "╰ Term: ")
p.push(p.peek() + " ")
n.Term.Accept(p)
p.pop()
}
func (p AstPrinter) VisitNumberNode(n *AstNumberNode) {
fmt.Println("NumberNode")
// numbers are presented as integers if they are whole, as
// floats if they have a decimal
value := fmt.Sprintf("%f", n.Value)
value = strings.TrimRight(value, "0")
value = strings.TrimRight(value, ".")
fmt.Println(p.peek() + "╰ Value: " + value)
}
func (p AstPrinter) VisitOrNode(n *AstOrNode) {
fmt.Println("OrNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitPositiveNode(n *AstPositiveNode) {
fmt.Println("PositiveNode")
fmt.Print(p.peek() + "╰ Term: ")
p.push(p.peek() + " ")
n.Term.Accept(p)
p.pop()
}
func (p AstPrinter) VisitProgramNode(n *AstProgramNode) {
fmt.Println("ProgramNode")
fmt.Print(p.peek() + "╰ Stmts: ")
if n.Stmts == nil || len(n.Stmts) == 0 {
fmt.Println("0x0")
} else {
p.push(p.peek() + " ")
n.Stmts[0].Accept(p)
if len(n.Stmts) > 1 {
for _, stmt := range n.Stmts[1:] {
fmt.Print(p.peek())
stmt.Accept(p)
}
}
p.pop()
}
}
func (p AstPrinter) VisitReturnNode(n *AstReturnNode) {
fmt.Println("ReturnNode")
fmt.Print(p.peek() + "╰ Expr: ")
p.push(p.peek() + " ")
n.Expr.Accept(p)
p.pop()
}
func (p AstPrinter) VisitStringNode(n *AstStringNode) {
fmt.Println("StringNode")
// strings are presented in quotes with its special characters
// escaped
r := strings.NewReplacer(
"\\\\", "\\",
"\r", "\\r",
"\n", "\\n",
"\t", "\\t",
"\"", "\\\"",
)
value := "\"" + r.Replace(n.Value) + "\""
fmt.Println(p.peek() + "╰ Value: " + value)
}
func (p AstPrinter) VisitSubtractNode(n *AstSubtractNode) {
fmt.Println("SubtractNode")
fmt.Print(p.peek() + "├ Left: ")
p.push(p.peek() + "│ ")
n.Left.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Right: ")
p.push(p.peek() + " ")
n.Right.Accept(p)
p.pop()
}
func (p AstPrinter) VisitVariableNode(n *AstVariableNode) {
fmt.Println("VariableNode")
fmt.Println(p.peek() + "╰ Name: " + n.Name)
}
func (p AstPrinter) VisitWhileNode(n *AstWhileNode) {
fmt.Println("WhileNode")
fmt.Print(p.peek() + "├ Cond: ")
p.push(p.peek() + "│ ")
n.Cond.Accept(p)
p.pop()
fmt.Print(p.peek() + "╰ Body: ")
if n.Body == nil || len(n.Body) == 0 {
fmt.Println("0x0")
return
}
p.push(p.peek() + " ")
n.Body[0].Accept(p)
if len(n.Body) > 1 {
for _, stmt := range n.Body[1:] {
fmt.Print(p.peek())
stmt.Accept(p)
}
}
p.pop()
}