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node.go
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node.go
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package colibri
import (
"fmt"
"net/url"
"strconv"
)
type Node interface {
// Find finds the first child node that matches the selector.
Find(selector *Selector) (Node, error)
// FindAll finds all child nodes that match the selector.
FindAll(selector *Selector) ([]Node, error)
// Value returns the value of the node.
Value() any
}
func FindSelectors(rules *Rules, resp Response, parent Node) (map[string]any, error) {
if (resp == nil) || (parent == nil) {
return nil, nil
}
var (
result = make(map[string]any)
errs error
)
for _, selector := range rules.Selectors {
found, err := findSelector(rules, resp, selector, parent)
if err != nil {
errs = AddError(errs, selector.Name, err)
continue
}
result[selector.Name] = found
}
return result, errs
}
func findSelector(src *Rules, resp Response, selector *Selector, parent Node) (any, error) {
if selector.All {
return findAllSelector(src, resp, selector, parent)
}
child, err := parent.Find(selector)
if err != nil {
return nil, err
} else if child == nil {
return nil, nil
}
if selector.Follow {
rules := selector.Rules(src)
defer ReleaseRules(rules)
return followSelector(rules, resp, child.Value())
}
if len(selector.Selectors) > 0 {
rules := selector.Rules(src)
defer ReleaseRules(rules)
return FindSelectors(rules, resp, child)
}
return child.Value(), nil
}
func findAllSelector(src *Rules, resp Response, selector *Selector, parent Node) ([]any, error) {
children, err := parent.FindAll(selector)
if err != nil {
return nil, err
}
var (
result []any
errs error
)
if !selector.Follow && (len(selector.Selectors) > 0) {
rules := selector.Rules(src)
defer ReleaseRules(rules)
for i, child := range children {
found, err := FindSelectors(rules, resp, child)
if err != nil {
errs = AddError(errs, strconv.Itoa(i), err)
continue
}
result = append(result, found)
}
return result, errs
}
for _, child := range children {
result = append(result, child.Value())
}
if selector.Follow {
rules := selector.Rules(src)
defer ReleaseRules(rules)
return followSelector(rules, resp, result...)
}
return result, errs
}
func followSelector(rules *Rules, resp Response, rawURL ...any) ([]any, error) {
var (
urls []*url.URL
errs error
)
for _, rawU := range rawURL {
u, err := ToURL(rawU)
if err != nil {
errs = AddError(errs, fmt.Sprintf("%v", rawU), err)
continue
}
if !u.IsAbs() {
u = resp.URL().ResolveReference(u)
}
urls = append(urls, u)
}
if errs != nil {
return nil, errs
}
var result []any
for _, u := range urls {
cRules := rules.Clone()
cRules.URL = u
out, err := resp.Extract(cRules)
if err != nil {
errs = AddError(errs, u.String(), err)
continue
}
result = append(result, out.Serializable())
ReleaseRules(cRules)
}
return result, errs
}