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71 lines
1.3 KiB
Go
71 lines
1.3 KiB
Go
package parser
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import (
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"bytes"
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)
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// caption checks for a caption, it returns the caption data and a potential "headingID".
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func (p *Parser) caption(data, caption []byte) ([]byte, string, int) {
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if !bytes.HasPrefix(data, caption) {
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return nil, "", 0
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}
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j := len(caption)
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data = data[j:]
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end := LinesUntilEmpty(data)
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data = data[:end]
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id, start := captionID(data)
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if id != "" {
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return data[:start], id, end + j
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}
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return data, "", end + j
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}
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// LinesUntilEmpty scans lines up to the first empty line.
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func LinesUntilEmpty(data []byte) int {
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line, i := 0, 0
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for line < len(data) {
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i++
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// find the end of this line
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for i < len(data) && data[i-1] != '\n' {
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i++
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}
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if IsEmpty(data[line:i]) == 0 {
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line = i
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continue
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}
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break
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}
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return i
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}
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// captionID checks if the caption *ends* in {#....}. If so the text after {# is taken to be
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// the ID/anchor of the entire figure block.
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func captionID(data []byte) (string, int) {
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end := len(data)
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j, k := 0, 0
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// find start/end of heading id
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for j = 0; j < end-1 && (data[j] != '{' || data[j+1] != '#'); j++ {
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}
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for k = j + 1; k < end && data[k] != '}'; k++ {
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}
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// remains must be whitespace.
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for l := k + 1; l < end; l++ {
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if !IsSpace(data[l]) {
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return "", 0
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}
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}
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if j > 0 && k > 0 && j+2 < k {
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return string(data[j+2 : k]), j
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}
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return "", 0
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}
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