83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
/*
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* Copyright © 2018-2020 A Bunch Tell LLC.
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*
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* This file is part of WriteFreely.
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*
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* WriteFreely 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, included
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* in the LICENSE file in this source code package.
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*/
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// Package parse assists in the parsing of plain text posts
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package parse
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import (
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"github.com/writeas/web-core/stringmanip"
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"regexp"
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"strings"
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)
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var (
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titleElementReg = regexp.MustCompile("</?p>")
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urlReg = regexp.MustCompile("https?://")
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imgReg = regexp.MustCompile(`!\[([^]]+)\]\([^)]+\)`)
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)
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// PostLede attempts to extract the first thought of the given post, generally
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// contained within the first line or sentence of text.
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func PostLede(t string, includePunc bool) string {
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// Adjust where we truncate if we want to include punctuation
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iAdj := 0
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if includePunc {
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iAdj = 1
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}
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// Find lede within first line of text
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nl := strings.IndexRune(t, '\n')
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if nl > -1 {
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t = t[:nl]
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}
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// Strip certain HTML tags
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t = titleElementReg.ReplaceAllString(t, "")
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// Strip URL protocols
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t = urlReg.ReplaceAllString(t, "")
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// Strip image URL, leaving only alt text
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t = imgReg.ReplaceAllString(t, " $1 ")
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// Find lede within first sentence
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punc := strings.Index(t, ". ")
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if punc > -1 {
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t = t[:punc+iAdj]
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}
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punc = stringmanip.IndexRune(t, '。')
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if punc > -1 {
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c := []rune(t)
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t = string(c[:punc+iAdj])
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}
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punc = stringmanip.IndexRune(t, '?')
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if punc > -1 {
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c := []rune(t)
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t = string(c[:punc+iAdj])
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}
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return t
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}
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// TruncToWord truncates the given text to the provided limit.
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func TruncToWord(s string, l int) (string, bool) {
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truncated := false
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c := []rune(s)
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if len(c) > l {
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truncated = true
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s = string(c[:l])
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spaceIdx := strings.LastIndexByte(s, ' ')
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if spaceIdx > -1 {
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s = s[:spaceIdx]
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}
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}
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return s, truncated
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}
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