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course.go
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course.go
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/*
Copyright 2024 The west2-online Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package jwch
import (
"regexp"
"sort"
"strconv"
"strings"
"github.com/west2-online/jwch/constants"
"github.com/west2-online/jwch/errno"
"github.com/west2-online/jwch/utils"
"github.com/antchfx/htmlquery"
)
// 获取我的学期
func (s *Student) GetTerms() (*Term, error) {
resp, err := s.GetWithIdentifier(constants.CourseURL)
if err != nil {
return nil, err
}
res := &Term{}
res.ViewState = htmlquery.SelectAttr(htmlquery.FindOne(resp, `//*[@id="__VIEWSTATE"]`), "value")
res.EventValidation = htmlquery.SelectAttr(htmlquery.FindOne(resp, `//*[@id="__EVENTVALIDATION"]`), "value")
// 获取学年学期，例如 202202/202201/202102/202101 需要获取value
list := htmlquery.Find(resp, `//*[@id="ContentPlaceHolder1_DDL_xnxq"]/option/@value`)
// 这里考虑过使用 len(list) < 1，但是实际上这没必要，因为小于1那么它必定是0
if len(list) == 0 {
return nil, errno.HTMLParseError.WithMessage("empty terms")
}
for _, node := range list {
res.Terms = append(res.Terms, htmlquery.SelectAttr(node, "value"))
}
return res, nil
}
// 获取我的选课
func (s *Student) GetSemesterCourses(term, viewState, eventValidation string) ([]*Course, error) {
resp, err := s.PostWithIdentifier(constants.CourseURL, map[string]string{
"ctl00$ContentPlaceHolder1$DDL_xnxq": term,
"ctl00$ContentPlaceHolder1$BT_submit": "确定",
"__VIEWSTATE": viewState,
"__EVENTVALIDATION": eventValidation,
})
if err != nil {
return nil, err
}
list := htmlquery.Find(htmlquery.FindOne(resp, `//*[@id="ContentPlaceHolder1_DataList_xxk"]/tbody`), "tr")
// 去除第一个元素，第一个元素是标题栏，有个判断文本是“课程名称”
// TODO: 我们如何确保第一个元素一定是标题栏?
list = list[2:]
res := make([]*Course, 0)
for _, node := range list {
// 教务处的表格HTML是不规范的，因此XPath解析会出现一些BUG
if strings.TrimSpace(htmlquery.SelectAttr(node, "style")) == "" {
continue
}
info := htmlquery.Find(node, `td`) // 一行的所有信息
// 这个表格有12栏
if len(info) < 12 {
return nil, errno.HTMLParseError.WithMessage("get course info failed")
}
// 解析调课信息
/*
06周 星期3:5-6节 调至 09周 星期1:7-8节 旗山西1-206
*/
courseInfo11 := strings.Split(utils.InnerTextWithBr(info[11]), "\n")
// 注意：下面的正则里面有 NO-BREAK SPACE (U+00A0 %C2%A0)
adjustRegex := regexp.MustCompile(`(\d{2})周 星期(\d):(\d{1,2})-(\d{1,2})节[\s ]*调至[\s ]*(\d{2})周 星期(\d):(\d{1,2})-(\d{1,2})节[\s ]*(\S*)`)
adjustRules := []CourseAdjustRule{}
for i := 0; i < len(courseInfo11); i++ {
courseInfo11[i] = strings.TrimSpace(courseInfo11[i])
if courseInfo11[i] == "" { // 空行
continue
}
adjustMatchArr := adjustRegex.FindStringSubmatch(courseInfo11[i])
if len(adjustMatchArr) < 10 {
return nil, errno.HTMLParseError.WithMessage("get course adjust failed")
}
adjustRules = append(adjustRules, CourseAdjustRule{
OldWeek: utils.SafeAtoi(adjustMatchArr[1]),
OldWeekday: utils.SafeAtoi(adjustMatchArr[2]),
OldStartClass: utils.SafeAtoi(adjustMatchArr[3]),
OldEndClass: utils.SafeAtoi(adjustMatchArr[4]),
NewWeek: utils.SafeAtoi(adjustMatchArr[5]),
NewWeekday: utils.SafeAtoi(adjustMatchArr[6]),
NewStartClass: utils.SafeAtoi(adjustMatchArr[7]),
NewEndClass: utils.SafeAtoi(adjustMatchArr[8]),
NewLocation: adjustMatchArr[9],
})
}
// 解析上课时间、地点，融合调课信息
/*
05-18 星期1:3-4节 铜盘A110
05-17 星期3:1-2节 铜盘A110
05-17 星期5:3-4节 铜盘A110
*/
courseInfo8 := strings.Split(utils.InnerTextWithBr(info[8]), "\n")
scheduleRules := []CourseScheduleRule{}
for i := 0; i < len(courseInfo8); i++ {
courseInfo8[i] = strings.TrimSpace(courseInfo8[i])
if courseInfo8[i] == "" { // 空行
continue
}
lineData := strings.Fields(courseInfo8[i])
if len(lineData) < 3 {
return nil, errno.HTMLParseError.WithMessage("get course info failed")
}
if strings.Contains(lineData[0], "周") { // 处理整周的课程，比如军训
/*
03周 星期1 - 04周 星期7
[0] 03周
[1] 星期1
[2] -
[3] 04周
[4] 星期7
*/
startWeek, _ := strconv.Atoi(strings.TrimSuffix(lineData[0], "周"))
endWeek, _ := strconv.Atoi(strings.TrimSuffix(lineData[3], "周"))
startWeekday, _ := strconv.Atoi(strings.TrimPrefix(lineData[1], "星期"))
endWeekday, _ := strconv.Atoi(strings.TrimPrefix(lineData[4], "星期"))
for weekday := 1; weekday <= 7; weekday++ {
curStartWeek := startWeek
curEndWeek := endWeek
if weekday < startWeekday {
curStartWeek++
}
if weekday > endWeekday {
curEndWeek--
}
if curStartWeek > curEndWeek {
continue
}
scheduleRules = append(scheduleRules, CourseScheduleRule{
Location: "",
StartClass: 1,
EndClass: 8,
StartWeek: curStartWeek,
EndWeek: curEndWeek,
Weekday: weekday,
Single: true,
Double: true,
Adjust: false,
FromFullWeek: true,
})
}
continue
}
/*
08-16 星期5:7-8节 铜盘A508
[0] 08-16
[1] 星期5:7-8节
[2] 铜盘A508
*/
/*
02-14 星期1:1-2节(双) 旗山西1-206
[0] 02-14
[1] 星期1:1-2节(双)
[2] 旗山西1-206
*/
/*
01-13 星期1:3-4节(单) 旗山西1-206
[0] 01-13
[1] 星期1:3-4节(单)
[2] 旗山西1-206
*/
// 是不是用正则表达式更好一点？
weekInfo := strings.SplitN(lineData[0], "-", 2) // [8, 16]
dayInfo := strings.SplitN(lineData[1], ":", 2) // ["星期5", "7-8节"] or ["星期1", "1-2节(双)"]
classBasicInfo := strings.Split(dayInfo[1], "节") // ["7-8", ""] or ["1-2", "(双)"]
classInfo := strings.Split(classBasicInfo[0], "-") // ["7", "8"]
location := lineData[2]
startClass := utils.SafeAtoi(classInfo[0])
endClass := utils.SafeAtoi(classInfo[1])
startWeek := utils.SafeAtoi(weekInfo[0])
endWeek := utils.SafeAtoi(weekInfo[1])
weekDay := utils.SafeAtoi(strings.TrimPrefix(dayInfo[0], "星期"))
single := !strings.Contains(classBasicInfo[1], "双")
double := !strings.Contains(classBasicInfo[1], "单")
if len(adjustRules) == 0 {
scheduleRules = append(scheduleRules, CourseScheduleRule{
Location: location,
StartClass: startClass,
EndClass: endClass,
StartWeek: startWeek,
EndWeek: endWeek,
Weekday: weekDay,
Single: single,
Double: double,
Adjust: false,
FromFullWeek: false,
})
} else {
startWeek := utils.SafeAtoi(weekInfo[0])
endWeek := utils.SafeAtoi(weekInfo[1])
startClass := utils.SafeAtoi(classInfo[0])
endClass := utils.SafeAtoi(classInfo[1])
removedWeeks := []int{}
for _, adjustRule := range adjustRules {
// 匹配是否是对应的调课信息
if adjustRule.OldWeek < startWeek ||
adjustRule.OldWeek > endWeek ||
adjustRule.OldStartClass != startClass ||
adjustRule.OldEndClass != endClass ||
adjustRule.OldWeekday != weekDay {
continue
}
// 记录被去掉的周次
removedWeeks = append(removedWeeks, adjustRule.OldWeek)
// 添加新的课程信息
scheduleRules = append(scheduleRules, CourseScheduleRule{
Location: adjustRule.NewLocation,
StartClass: adjustRule.NewStartClass,
EndClass: adjustRule.NewEndClass,
StartWeek: adjustRule.NewWeek,
EndWeek: adjustRule.NewWeek,
Weekday: adjustRule.NewWeekday,
Single: true,
Double: true,
Adjust: true, // 调课
FromFullWeek: false,
})
}
sort.Ints(removedWeeks)
// 去掉被调课的周次
curStartWeek := startWeek
for _, removedWeek := range removedWeeks {
if removedWeek == curStartWeek {
curStartWeek++
continue
}
scheduleRules = append(scheduleRules, CourseScheduleRule{
Location: location,
StartClass: startClass,
EndClass: endClass,
StartWeek: curStartWeek,
EndWeek: removedWeek - 1,
Weekday: weekDay,
Single: single,
Double: double,
Adjust: false,
FromFullWeek: false,
})
curStartWeek = removedWeek + 1
}
if curStartWeek <= endWeek {
scheduleRules = append(scheduleRules, CourseScheduleRule{
Location: location,
StartClass: startClass,
EndClass: endClass,
StartWeek: curStartWeek,
EndWeek: endWeek,
Weekday: weekDay,
Single: single,
Double: double,
Adjust: false,
FromFullWeek: false,
})
}
}
}
// TODO: performance optimization
res = append(res, &Course{
Type: htmlquery.OutputHTML(info[0], false),
Name: htmlquery.OutputHTML(info[1], false),
Syllabus: constants.JwchPrefix + safeExtractRegex(`javascript:pop1\('(.*?)&`, safeExtractionValue(info[2], "a", "href", 0)),
LessonPlan: constants.JwchPrefix + safeExtractRegex(`javascript:pop1\('(.*?)&`, safeExtractionValue(info[2], "a", "href", 1)),
// PaymentStatus: safeExtractionFirst(info[3], "font"),
Credits: safeExtractionFirst(info[4], "span"),
ElectiveType: utils.GetChineseCharacter(htmlquery.OutputHTML(info[5], false)),
ExamType: utils.GetChineseCharacter(htmlquery.OutputHTML(info[6], false)),
Teacher: htmlquery.OutputHTML(info[7], false),
ScheduleRules: scheduleRules,
RawScheduleRules: strings.Join(courseInfo8, "\n"),
RawExamTime: strings.TrimSpace(htmlquery.InnerText(info[9])),
RawAdjust: strings.Join(courseInfo11, "\n"),
Remark: htmlquery.OutputHTML(info[10], false),
})
}
return res, nil
}