237 lines
5.0 KiB
Go
237 lines
5.0 KiB
Go
/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package main
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"net/url"
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"regexp"
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"strconv"
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"strings"
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"github.com/PuerkitoBio/goquery"
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"github.com/naoina/toml"
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)
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//
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// semantics
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//
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type semantics struct {
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Accomodating float64
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Affordable float64
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Atmospheric float64
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Delicious float64
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}
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func (s semantics) combine(other semantics, weight float64) semantics {
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return semantics{
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s.Accomodating + other.Accomodating*weight,
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s.Affordable + other.Affordable*weight,
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s.Atmospheric + other.Atmospheric*weight,
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s.Delicious + other.Delicious*weight,
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}
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}
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func (s semantics) reduce(weight float64) semantics {
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return semantics{
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s.Accomodating / weight,
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s.Affordable / weight,
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s.Atmospheric / weight,
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s.Delicious / weight,
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}
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}
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//
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// selector
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//
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type selector struct {
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Path string
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Attr string
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RegEx string
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regExComp *regexp.Regexp
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}
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func (l *selector) locateStrings(doc *goquery.Document) ([]string, error) {
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var err error
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if len(l.RegEx) > 0 && l.regExComp == nil {
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if l.regExComp, err = regexp.Compile(l.RegEx); err != nil {
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return nil, err
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}
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}
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var strs []string
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doc.Find(l.Path).Each(func(index int, sel *goquery.Selection) {
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var str string
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if len(l.Attr) > 0 {
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str, _ = sel.Attr(l.Attr)
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} else {
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str = sel.Text()
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}
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if l.regExComp != nil {
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if matches := l.regExComp.FindStringSubmatch(str); len(matches) > 1 {
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str = matches[1]
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} else {
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str = ""
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}
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}
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strs = append(strs, str)
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})
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return strs, err
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}
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func (l *selector) locateString(doc *goquery.Document) (string, error) {
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strs, err := l.locateStrings(doc)
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if err != nil {
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return "", err
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}
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return strings.Join(strs, " "), nil
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}
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func (l *selector) locateInt(doc *goquery.Document) (int64, error) {
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str, err := l.locateString(doc)
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if err != nil {
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return 0, err
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}
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return strconv.ParseInt(str, 10, 8)
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}
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func (l *selector) locateFloat(doc *goquery.Document) (float64, error) {
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str, err := l.locateString(doc)
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if err != nil {
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return 0.0, err
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}
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return strconv.ParseFloat(str, 8)
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}
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//
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// converter
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//
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type converter struct {
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Domains []string
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Index struct {
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Items selector
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Next selector
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}
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Item struct {
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Name selector
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Address selector
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Count selector
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Props map[string]struct {
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semantics
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selector
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Scale float64
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}
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}
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}
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func newConverter(filename string) (*converter, error) {
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bytes, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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var desc converter
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if err := toml.Unmarshal(bytes, &desc); err != nil {
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return nil, err
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}
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return &desc, nil
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}
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func (c converter) define(keyword string) semantics {
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return c.Item.Props[keyword].semantics
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}
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func (c converter) compatible(address string) bool {
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parsed, err := url.Parse(address)
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if err != nil {
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return false
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}
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for _, d := range c.Domains {
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if d == parsed.Host {
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return true
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}
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}
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return false
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}
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func (c converter) index(doc *goquery.Document) (next string, items []string, err error) {
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if items, err = c.Index.Items.locateStrings(doc); err != nil {
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return
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}
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if next, err = c.Index.Next.locateString(doc); err != nil {
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return
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}
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return
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}
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func (c converter) review(doc *goquery.Document) (name, address string, features map[string]float64, count int64, err error) {
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if name, err = c.Item.Name.locateString(doc); err != nil || len(name) == 0 {
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err = errors.New("invalid name")
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return
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}
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if address, err = c.Item.Address.locateString(doc); err != nil || len(address) == 0 {
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err = errors.New("invalid address")
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return
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}
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if count, err = c.Item.Count.locateInt(doc); err != nil {
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err = errors.New("invalid review count")
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return
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}
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features = make(map[string]float64)
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for n, p := range c.Item.Props {
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var value float64
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if value, err = p.locateFloat(doc); err != nil {
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err = fmt.Errorf("invalid feature value for %s", n)
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return
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}
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if p.Scale != 0.0 {
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value /= p.Scale
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}
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features[n] = value
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}
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return
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}
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