// walk recursively goes through each node and translates the nodes to
// javascript, writing the result to s.wr
func (s *state) walk(node ast.Node) {
s.at(node)
switch node := node.(type) {
case *ast.SoyFileNode:
s.visitSoyFile(node)
case *ast.NamespaceNode:
s.visitNamespace(node)
case *ast.SoyDocNode:
return
case *ast.TemplateNode:
s.visitTemplate(node)
case *ast.ListNode:
s.visitChildren(node)
// Output nodes ----------
case *ast.RawTextNode:
s.writeRawText(node.Text)
case *ast.PrintNode:
s.visitPrint(node)
case *ast.MsgNode:
s.walk(node.Body)
case *ast.CssNode:
if node.Expr != nil {
s.jsln(s.bufferName, " += ", node.Expr, " + '-';")
}
s.writeRawText([]byte(node.Suffix))
case *ast.DebuggerNode:
s.jsln("debugger;")
case *ast.LogNode:
s.bufferName += "_"
s.jsln("var ", s.bufferName, " = '';")
s.walk(node.Body)
s.jsln("console.log(", s.bufferName, ");")
s.bufferName = s.bufferName[:len(s.bufferName)-1]
// Control flow ----------
case *ast.IfNode:
s.visitIf(node)
case *ast.ForNode:
s.visitFor(node)
case *ast.SwitchNode:
s.visitSwitch(node)
case *ast.CallNode:
s.visitCall(node)
case *ast.LetValueNode:
s.jsln("var ", s.scope.makevar(node.Name), " = ", node.Expr, ";")
case *ast.LetContentNode:
var oldBufferName = s.bufferName
s.bufferName = s.scope.makevar(node.Name)
s.jsln("var ", s.bufferName, " = '';")
s.walk(node.Body)
s.bufferName = oldBufferName
// Values ----------
case *ast.NullNode:
s.js("null")
case *ast.StringNode:
s.js("'")
template.JSEscape(s.wr, []byte(node.Value))
s.js("'")
case *ast.IntNode:
s.js(node.String())
case *ast.FloatNode:
s.js(node.String())
case *ast.BoolNode:
s.js(node.String())
case *ast.GlobalNode:
s.visitGlobal(node)
case *ast.ListLiteralNode:
s.js("[")
for i, item := range node.Items {
if i != 0 {
s.js(",")
}
s.walk(item)
}
s.js("]")
case *ast.MapLiteralNode:
s.js("{")
var first = true
for k, v := range node.Items {
if !first {
s.js(",")
}
first = false
s.js(k, ":")
s.walk(v)
}
s.js("}")
case *ast.FunctionNode:
s.visitFunction(node)
case *ast.DataRefNode:
s.visitDataRef(node)
// Arithmetic operators ----------
case *ast.NegateNode:
s.js("(-", node.Arg, ")")
case *ast.AddNode:
s.op("+", node)
case *ast.SubNode:
s.op("-", node)
case *ast.DivNode:
s.op("/", node)
case *ast.MulNode:
s.op("*", node)
case *ast.ModNode:
s.op("%", node)
// Arithmetic comparisons ----------
case *ast.EqNode:
s.op("==", node)
case *ast.NotEqNode:
s.op("!=", node)
case *ast.LtNode:
s.op("<", node)
case *ast.LteNode:
s.op("<=", node)
case *ast.GtNode:
s.op(">", node)
case *ast.GteNode:
s.op(">=", node)
// Boolean operators ----------
case *ast.NotNode:
s.js("!(", node.Arg, ")")
case *ast.AndNode:
s.op("&&", node)
case *ast.OrNode:
s.op("||", node)
case *ast.ElvisNode:
// ?: is specified to check for null.
s.js("(", node.Arg1, " != null ? ", node.Arg1, " : ", node.Arg2, ")")
case *ast.TernNode:
s.js("(", node.Arg1, "?", node.Arg2, ":", node.Arg3, ")")
default:
s.errorf("unknown node (%T): %v", node, node)
}
}
// walk recursively goes through each node and executes the indicated logic and
// writes the output
func (s *state) walk(node ast.Node) {
s.val = data.Undefined{}
s.at(node)
switch node := node.(type) {
case *ast.SoyFileNode:
for _, node := range node.Body {
s.walk(node)
}
case *ast.TemplateNode:
if node.Autoescape != ast.AutoescapeUnspecified {
s.autoescape = node.Autoescape
}
s.walk(node.Body)
case *ast.ListNode:
for _, node := range node.Nodes {
s.walk(node)
}
// Output nodes ----------
case *ast.PrintNode:
s.evalPrint(node)
case *ast.RawTextNode:
if _, err := s.wr.Write(node.Text); err != nil {
s.errorf("%s", err)
}
case *ast.MsgNode:
s.walk(node.Body)
case *ast.CssNode:
var prefix = ""
if node.Expr != nil {
prefix = s.eval(node.Expr).String() + "-"
}
if _, err := io.WriteString(s.wr, prefix+node.Suffix); err != nil {
s.errorf("%s", err)
}
case *ast.DebuggerNode:
// nothing to do
case *ast.LogNode:
Logger.Print(string(s.renderBlock(node.Body)))
// Control flow ----------
case *ast.IfNode:
for _, cond := range node.Conds {
if cond.Cond == nil || s.eval(cond.Cond).Truthy() {
s.walk(cond.Body)
break
}
}
case *ast.ForNode:
var list, ok = s.eval(node.List).(data.List)
if !ok {
s.errorf("In for loop %q, %q does not resolve to a list.",
node.String(), node.List.String())
}
if len(list) == 0 {
if node.IfEmpty != nil {
s.walk(node.IfEmpty)
}
break
}
s.context.push()
for i, item := range list {
s.context.set(node.Var, item)
s.context.set(node.Var+"__index", data.Int(i))
s.context.set(node.Var+"__lastIndex", data.Int(len(list)-1))
s.walk(node.Body)
}
s.context.pop()
case *ast.SwitchNode:
var switchValue = s.eval(node.Value)
for _, caseNode := range node.Cases {
for _, caseValueNode := range caseNode.Values {
if switchValue.Equals(s.eval(caseValueNode)) {
s.walk(caseNode.Body)
return
}
}
if len(caseNode.Values) == 0 { // default/last case
s.walk(caseNode.Body)
return
}
}
case *ast.CallNode:
s.evalCall(node)
case *ast.LetValueNode:
s.context.set(node.Name, s.eval(node.Expr))
case *ast.LetContentNode:
s.context.set(node.Name, data.String(s.renderBlock(node.Body)))
// Values ----------
case *ast.NullNode:
s.val = data.Null{}
case *ast.StringNode:
s.val = data.String(node.Value)
case *ast.IntNode:
s.val = data.Int(node.Value)
case *ast.FloatNode:
s.val = data.Float(node.Value)
case *ast.BoolNode:
s.val = data.Bool(node.True)
case *ast.GlobalNode:
s.val = node.Value
case *ast.ListLiteralNode:
var items = make(data.List, len(node.Items))
for i, item := range node.Items {
items[i] = s.eval(item)
}
s.val = data.List(items)
case *ast.MapLiteralNode:
var items = make(data.Map, len(node.Items))
for k, v := range node.Items {
items[k] = s.eval(v)
}
s.val = data.Map(items)
case *ast.FunctionNode:
s.val = s.evalFunc(node)
case *ast.DataRefNode:
s.val = s.evalDataRef(node)
// Arithmetic operators ----------
case *ast.NegateNode:
switch arg := s.evaldef(node.Arg).(type) {
case data.Int:
s.val = data.Int(-arg)
case data.Float:
s.val = data.Float(-arg)
default:
s.errorf("can not negate non-number: %q", arg.String())
}
case *ast.AddNode:
var arg1, arg2 = s.eval2def(node.Arg1, node.Arg2)
switch {
case isInt(arg1) && isInt(arg2):
s.val = data.Int(arg1.(data.Int) + arg2.(data.Int))
case isString(arg1) || isString(arg2):
s.val = data.String(arg1.String() + arg2.String())
default:
s.val = data.Float(toFloat(arg1) + toFloat(arg2))
}
case *ast.SubNode:
var arg1, arg2 = s.eval2def(node.Arg1, node.Arg2)
switch {
case isInt(arg1) && isInt(arg2):
s.val = data.Int(arg1.(data.Int) - arg2.(data.Int))
default:
s.val = data.Float(toFloat(arg1) - toFloat(arg2))
}
case *ast.DivNode:
var arg1, arg2 = s.eval2def(node.Arg1, node.Arg2)
s.val = data.Float(toFloat(arg1) / toFloat(arg2))
case *ast.MulNode:
var arg1, arg2 = s.eval2def(node.Arg1, node.Arg2)
switch {
case isInt(arg1) && isInt(arg2):
s.val = data.Int(arg1.(data.Int) * arg2.(data.Int))
default:
s.val = data.Float(toFloat(arg1) * toFloat(arg2))
}
case *ast.ModNode:
var arg1, arg2 = s.eval2def(node.Arg1, node.Arg2)
s.val = data.Int(arg1.(data.Int) % arg2.(data.Int))
// Arithmetic comparisons ----------
case *ast.EqNode:
s.val = data.Bool(s.eval(node.Arg1).Equals(s.eval(node.Arg2)))
case *ast.NotEqNode:
s.val = data.Bool(!s.eval(node.Arg1).Equals(s.eval(node.Arg2)))
case *ast.LtNode:
s.val = data.Bool(toFloat(s.evaldef(node.Arg1)) < toFloat(s.evaldef(node.Arg2)))
case *ast.LteNode:
s.val = data.Bool(toFloat(s.evaldef(node.Arg1)) <= toFloat(s.evaldef(node.Arg2)))
case *ast.GtNode:
s.val = data.Bool(toFloat(s.evaldef(node.Arg1)) > toFloat(s.evaldef(node.Arg2)))
case *ast.GteNode:
s.val = data.Bool(toFloat(s.evaldef(node.Arg1)) >= toFloat(s.evaldef(node.Arg2)))
// Boolean operators ----------
case *ast.NotNode:
s.val = data.Bool(!s.eval(node.Arg).Truthy())
case *ast.AndNode:
s.val = data.Bool(s.eval(node.Arg1).Truthy() && s.eval(node.Arg2).Truthy())
case *ast.OrNode:
s.val = data.Bool(s.eval(node.Arg1).Truthy() || s.eval(node.Arg2).Truthy())
case *ast.ElvisNode:
var arg1 = s.eval(node.Arg1)
if arg1 != (data.Null{}) && arg1 != (data.Undefined{}) {
s.val = arg1
} else {
s.val = s.eval(node.Arg2)
}
case *ast.TernNode:
var arg1 = s.eval(node.Arg1)
if arg1.Truthy() {
s.val = s.eval(node.Arg2)
} else {
s.val = s.eval(node.Arg3)
}
default:
s.errorf("unknown node: %T", node)
}
}