From cf8f88dd5d35a48af361caf89f43a5dc351db40a Mon Sep 17 00:00:00 2001
From: songqingqing <18520276036@163.com>
Date: Wed, 11 Dec 2024 16:20:20 +0800
Subject: [PATCH] =?UTF-8?q?Simplify=E5=8C=85=EF=BC=9A=20=E6=A8=A1=E6=8B=9F?=
 =?UTF-8?q?ES=E9=83=A8=E5=88=86=E5=88=86=E8=AF=8D=E8=A7=84=E5=88=99?=
 =?UTF-8?q?=EF=BC=8C=E5=AF=B9=E6=9F=A5=E8=AF=A2=E5=85=B3=E9=94=AE=E5=AD=97?=
 =?UTF-8?q?=E8=BF=9B=E8=A1=8C=E5=8E=BB=E9=87=8D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 simplify/codes.go |   3 +
 simplify/words.go | 172 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 175 insertions(+)
 create mode 100644 simplify/codes.go
 create mode 100644 simplify/words.go

diff --git a/simplify/codes.go b/simplify/codes.go
new file mode 100644
index 0000000..34d5b50
--- /dev/null
+++ b/simplify/codes.go
@@ -0,0 +1,3 @@
+package simplify
+
+//TODO 如果是层级筛选，有 父级code 就不再需要 子级code 了
diff --git a/simplify/words.go b/simplify/words.go
new file mode 100644
index 0000000..4d511ce
--- /dev/null
+++ b/simplify/words.go
@@ -0,0 +1,172 @@
+package simplify
+
+import (
+	"slices"
+	"strings"
+	"unicode"
+)
+
+// 模拟ES部分分词规则，对查询关键字进行去重
+
+type Words struct {
+	whole []string
+	input []string
+}
+
+func NewWords(whole []string, input []string) *Words {
+	return &Words{whole: whole, input: input}
+}
+
+func (w *Words) Simplify() []string {
+
+	// 分隔符列表，与ES搜索的分隔符保持一致
+	separators := w.separators()
+
+	keywords := make([]string, 0)
+	keywords = append(keywords, w.input...)
+	keywords = append(keywords, w.whole...)
+
+	wides := make(map[string]string)
+	for _, keyword := range keywords {
+		// 转换为小写并去除两端空白字符，规避大小写造成异常剔除
+		keyword = strings.ToLower(strings.TrimSpace(keyword))
+		if keyword == "" {
+			continue
+		}
+		// 将分隔符替换为空格
+		str := keyword
+		for _, separator := range separators {
+			str = strings.ReplaceAll(str, separator, " ")
+		}
+		wide := " " + strings.Join(strings.Fields(str), " ") + " " // 空格开头结尾，便于包含判断
+		if strings.TrimSpace(wide) == "" {
+			continue
+		}
+		wides[keyword] = wide
+	}
+
+	// 计算重复次数
+	repetition := make(map[string]int)
+	for _, wide1 := range wides {
+		for keyword, wide2 := range wides {
+
+			// 首尾空格字符串 包含另一个 首尾空格字符串，则认为重复
+			if strings.Contains(wide2, wide1) {
+				repetition[keyword]++
+				continue
+			}
+
+			// 子串 在 首尾空格父串 中， 前后位置的字符 是 中文或空格，也认为重复
+			before, after := w.checkSurroundingChineseOrSpace([]rune(wide2), []rune(strings.TrimSpace(wide1)))
+			if before && after {
+				repetition[keyword]++
+				continue
+			}
+		}
+	}
+
+	// 筛选出不重复且不是输入的字符串
+	filteredInput := make([]string, 0)
+	filteredWhole := make([]string, 0)
+	for keyword, times := range repetition {
+		if times == 1 {
+			if slices.Contains(w.input, keyword) {
+				filteredInput = append(filteredInput, keyword)
+			} else {
+				filteredWhole = append(filteredWhole, keyword)
+			}
+		}
+	}
+
+	result := make([]string, 0)
+	result = append(result, filteredInput...) // ‘input’ 放在前面，保证输入字符串优先
+	result = append(result, filteredWhole...)
+	return result
+}
+
+// isChineseOrSpace 判断给定的rune字符是否为中文或空格
+func (w *Words) isChineseOrSpace(r rune) bool {
+	return r == ' ' || unicode.Is(unicode.Scripts["Han"], r)
+}
+
+// CheckSurroundingChineseOrSpace 检查子串sub前后的UTF-8字符是否为中文或空格
+func (w *Words) checkSurroundingChineseOrSpace(str []rune, sub []rune) (bool, bool) {
+	// 找到子串在父串中的位置
+	startIndex := -1
+	lenStr := len(str)
+	lenSub := len(sub)
+	for i := 0; i <= lenStr-lenSub; i++ {
+		if str[i] == sub[0] { // 找到子串的起始字符
+			match := true
+			for j := 1; j < lenSub; j++ {
+				if i+j >= lenStr || str[i+j] != sub[j] {
+					match = false
+					break
+				}
+			}
+			if match {
+				startIndex = i
+				break
+			}
+		}
+	}
+
+	if startIndex == -1 {
+		// 子串不在父串中
+		return false, false
+	}
+
+	// 检查子串前后的字符是否为中文或空格
+	var isBeforeChineseOrSpace, isAfterChineseOrSpace bool
+	if startIndex > 0 {
+		isBeforeChineseOrSpace = w.isChineseOrSpace(str[startIndex-1])
+	}
+	if startIndex+len(sub) < len(str) {
+		isAfterChineseOrSpace = w.isChineseOrSpace(str[startIndex+len(sub)])
+	}
+
+	return isBeforeChineseOrSpace, isAfterChineseOrSpace
+}
+
+func (w *Words) separators() []string {
+	// 分隔符列表，与ES搜索的分隔符保持一致
+	return []string{
+		"~", "!", "@", "#", "$", "%", "^", "&", "*", "(", ")",
+		// "_",
+		"+",
+
+		"`", "-", "=",
+		"{", "}", "|",
+		"[", "]", "\\",
+
+		// ":",
+		"\"",
+
+		";",
+		// "'",
+
+		"<", ">", "?",
+
+		",",
+		// ".",
+		"/",
+
+		"\r\n", "\r", "\n", "\t",
+
+		"！", "￥", "…", "（", "）", "—",
+
+		// "·",
+
+		"【", "】", "、",
+
+		"；",
+		// "‘",
+		// "’",
+
+		// "：",
+		"“",
+
+		"》", "《", "？",
+		"，", "。", "、",
+	}
+}