// LineNumber computes the line number in the input source for the given node
// within the given template.
func (r *Registry) LineNumber(templateName string, node ast.Node) int {
var src, ok = r.sourceByTemplateName[templateName]
if !ok {
log.Println("template not found:", templateName)
return 0
}
return 1 + strings.Count(src[:node.Position()], "\n")
}
// parseTernary parses the ternary operator within an expression.
// itemTernIf has already been read, and the condition is provided.
func (t *tree) parseTernary(cond ast.Node) ast.Node {
n1 := t.parseExpr(0)
t.expect(itemColon, "ternary")
n2 := t.parseExpr(0)
result := &ast.TernNode{cond.Position(), cond, n1, n2}
if t.peek().typ == itemColon {
t.next()
return t.parseTernary(result)
}
return result
}
