mirror of
https://github.com/siyuan-note/siyuan.git
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102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
// SiYuan - Build Your Eternal Digital Garden
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// Copyright (c) 2020-present, b3log.org
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package search
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import (
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"regexp"
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"strings"
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"unicode/utf8"
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"github.com/siyuan-note/siyuan/kernel/util"
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)
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func MarkText(text string, keyword string, beforeLen int, caseSensitive bool) (pos int, marked string) {
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if "" == keyword {
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return -1, util.EscapeHTML(text)
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}
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text = util.EscapeHTML(text)
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keywords := SplitKeyword(keyword)
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marked = EncloseHighlighting(text, keywords, "<mark>", "</mark>", caseSensitive)
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pos = strings.Index(marked, "<mark>")
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if 0 > pos {
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return
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}
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var before []rune
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var count int
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for i := pos; 0 < i; { // 关键字前面太长的话缩短一些
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r, size := utf8.DecodeLastRuneInString(marked[:i])
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i -= size
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before = append([]rune{r}, before...)
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count++
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if beforeLen < count {
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before = append([]rune("..."), before...)
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break
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}
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}
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marked = string(before) + marked[pos:]
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return
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}
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const (
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TermSep = "__term@sep__"
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SearchMarkLeft = "__@mark__"
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SearchMarkRight = "__mark@__"
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)
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func SplitKeyword(keyword string) (keywords []string) {
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keyword = strings.TrimSpace(keyword)
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if "" == keyword {
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return
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}
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words := strings.Split(keyword, TermSep)
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if 1 < len(words) {
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for _, word := range words {
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if "" == word {
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continue
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}
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keywords = append(keywords, word)
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}
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} else {
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keywords = append(keywords, keyword)
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}
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return
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}
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func EncloseHighlighting(text string, keywords []string, openMark, closeMark string, caseSensitive bool) (ret string) {
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ic := "(?i)"
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if caseSensitive {
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ic = "(?)"
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}
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re := ic + "("
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for i, k := range keywords {
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k = regexp.QuoteMeta(k)
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re += "(" + k + ")"
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if i < len(keywords)-1 {
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re += "|"
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}
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}
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re += ")"
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ret = text
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if reg, err := regexp.Compile(re); nil == err {
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ret = reg.ReplaceAllStringFunc(text, func(s string) string { return openMark + s + closeMark })
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}
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return
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}
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