mirror of
https://github.com/42wim/matterbridge.git
synced 2024-12-22 11:12:44 +01:00
185 lines
3.8 KiB
Go
185 lines
3.8 KiB
Go
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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
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// See License.txt for license information.
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package markdown
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import (
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"unicode/utf8"
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)
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func parseLinkDestination(markdown string, position int) (raw Range, next int, ok bool) {
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if position >= len(markdown) {
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return
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}
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if markdown[position] == '<' {
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isEscaped := false
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for offset, c := range []byte(markdown[position+1:]) {
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if isEscaped {
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isEscaped = false
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if isEscapableByte(c) {
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continue
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}
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}
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if c == '\\' {
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isEscaped = true
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} else if c == '<' {
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break
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} else if c == '>' {
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return Range{position + 1, position + 1 + offset}, position + 1 + offset + 1, true
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} else if isWhitespaceByte(c) {
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break
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}
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}
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}
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openCount := 0
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isEscaped := false
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for offset, c := range []byte(markdown[position:]) {
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if isEscaped {
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isEscaped = false
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if isEscapableByte(c) {
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continue
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}
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}
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switch c {
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case '\\':
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isEscaped = true
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case '(':
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openCount++
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case ')':
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if openCount < 1 {
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return Range{position, position + offset}, position + offset, true
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}
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openCount--
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default:
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if isWhitespaceByte(c) {
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return Range{position, position + offset}, position + offset, true
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}
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}
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}
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return Range{position, len(markdown)}, len(markdown), true
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}
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func parseLinkTitle(markdown string, position int) (raw Range, next int, ok bool) {
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if position >= len(markdown) {
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return
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}
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originalPosition := position
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var closer byte
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switch markdown[position] {
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case '"', '\'':
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closer = markdown[position]
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case '(':
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closer = ')'
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default:
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return
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}
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position++
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for position < len(markdown) {
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switch markdown[position] {
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case '\\':
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position++
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if position < len(markdown) && isEscapableByte(markdown[position]) {
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position++
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}
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case closer:
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return Range{originalPosition + 1, position}, position + 1, true
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default:
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position++
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}
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}
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return
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}
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func parseLinkLabel(markdown string, position int) (raw Range, next int, ok bool) {
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if position >= len(markdown) || markdown[position] != '[' {
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return
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}
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originalPosition := position
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position++
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for position < len(markdown) {
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switch markdown[position] {
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case '\\':
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position++
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if position < len(markdown) && isEscapableByte(markdown[position]) {
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position++
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}
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case '[':
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return
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case ']':
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if position-originalPosition >= 1000 && utf8.RuneCountInString(markdown[originalPosition:position]) >= 1000 {
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return
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}
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return Range{originalPosition + 1, position}, position + 1, true
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default:
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position++
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}
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}
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return
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}
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// As a non-standard feature, we allow image links to specify dimensions of the image by adding "=WIDTHxHEIGHT"
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// after the image destination but before the image title like ![alt](http://example.com/image.png =100x200 "title").
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// Both width and height are optional, but at least one of them must be specified.
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func parseImageDimensions(markdown string, position int) (raw Range, next int, ok bool) {
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if position >= len(markdown) {
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return
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}
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originalPosition := position
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// Read =
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position += 1
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if position >= len(markdown) {
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return
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}
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// Read width
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hasWidth := false
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for isNumericByte(markdown[position]) {
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hasWidth = true
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position += 1
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}
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// Look for early end of dimensions
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if isWhitespaceByte(markdown[position]) || markdown[position] == ')' {
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return Range{originalPosition, position - 1}, position, true
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}
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// Read the x
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if markdown[position] != 'x' && markdown[position] != 'X' {
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return
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}
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position += 1
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// Read height
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hasHeight := false
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for isNumericByte(markdown[position]) {
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hasHeight = true
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position += 1
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}
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// Make sure the there's no trailing characters
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if !isWhitespaceByte(markdown[position]) && markdown[position] != ')' {
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return
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}
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if !hasWidth && !hasHeight {
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// At least one of width or height is required
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return
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}
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return Range{originalPosition, position - 1}, position, true
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}
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