func (tc *templateChecker) recurse(parent ast.ParentNode) {
var initialForVars = len(tc.forVars)
var initialLetVars = len(tc.letVars)
var initialUsedKeys = len(tc.usedKeys)
for _, child := range parent.Children() {
tc.checkTemplate(child)
}
tc.forVars = tc.forVars[:initialForVars]
// quick return if there were no {let}s
if initialLetVars == len(tc.letVars) {
return
}
// "pop" the {let} variables, as well as their usages.
// (this is necessary to handle shadowing of @params by {let} vars)
var letVarsGoingOutOfScope = tc.letVars[initialLetVars:]
var usedKeysToKeep, usedLets []string
for _, key := range tc.usedKeys[initialUsedKeys:] {
if contains(letVarsGoingOutOfScope, key) {
usedLets = append(usedLets, key)
} else {
usedKeysToKeep = append(usedKeysToKeep, key)
}
}
// check that any let variables leaving scope have been used
for _, letVar := range letVarsGoingOutOfScope {
if !contains(usedLets, letVar) {
panic(fmt.Errorf("{let} variable %q is not used.", letVar))
}
}
tc.usedKeys = append(tc.usedKeys[:initialUsedKeys], usedKeysToKeep...)
tc.letVars = tc.letVars[:initialLetVars]
}
func (s *state) op(symbol string, node ast.ParentNode) {
var children = node.Children()
s.js("(", children[0], " ", symbol, " ", children[1], ")")
}
func (s *state) visitChildren(parent ast.ParentNode) {
for _, child := range parent.Children() {
s.walk(child)
}
}