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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package math
import (
"bytes"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/text"
)
type inlineParser struct {
trigger []byte
endBytesSingleDollar []byte
endBytesDoubleDollar []byte
endBytesParentheses []byte
enableInlineDollar bool
}
func NewInlineDollarParser(enableInlineDollar bool) parser.InlineParser {
return &inlineParser{
trigger: []byte{'$'},
endBytesSingleDollar: []byte{'$'},
endBytesDoubleDollar: []byte{'$', '$'},
enableInlineDollar: enableInlineDollar,
}
}
var defaultInlineParenthesesParser = &inlineParser{
trigger: []byte{'\\', '('},
endBytesParentheses: []byte{'\\', ')'},
}
func NewInlineParenthesesParser() parser.InlineParser {
return defaultInlineParenthesesParser
}
// Trigger triggers this parser on $ or \
func (parser *inlineParser) Trigger() []byte {
return parser.trigger
}
func isPunctuation(b byte) bool {
return b == '.' || b == '!' || b == '?' || b == ',' || b == ';' || b == ':'
}
func isParenthesesClose(b byte) bool {
return b == ')'
}
func isAlphanumeric(b byte) bool {
return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || (b >= '0' && b <= '9')
}
// Parse parses the current line and returns a result of parsing.
func (parser *inlineParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
line, _ := block.PeekLine()
if !bytes.HasPrefix(line, parser.trigger) {
// We'll catch this one on the next time round
return nil
}
var startMarkLen int
var stopMark []byte
checkSurrounding := true
if line[0] == '$' {
startMarkLen = 1
stopMark = parser.endBytesSingleDollar
if len(line) > 1 {
switch line[1] {
case '$':
startMarkLen = 2
stopMark = parser.endBytesDoubleDollar
case '`':
pos := 1
for ; pos < len(line) && line[pos] == '`'; pos++ {
}
startMarkLen = pos
stopMark = bytes.Repeat([]byte{'`'}, pos)
stopMark[len(stopMark)-1] = '$'
checkSurrounding = false
}
}
} else {
startMarkLen = 2
stopMark = parser.endBytesParentheses
}
if line[0] == '$' && !parser.enableInlineDollar && (len(line) == 1 || line[1] != '`') {
return nil
}
if checkSurrounding {
precedingCharacter := block.PrecendingCharacter()
if precedingCharacter < 256 && (isAlphanumeric(byte(precedingCharacter)) || isPunctuation(byte(precedingCharacter))) {
// need to exclude things like `a$` from being considered a start
return nil
}
}
// move the opener marker point at the start of the text
opener := startMarkLen
// Now look for an ending line
depth := 0
ender := -1
for i := opener; i < len(line); i++ {
if depth == 0 && bytes.HasPrefix(line[i:], stopMark) {
succeedingCharacter := byte(0)
if i+len(stopMark) < len(line) {
succeedingCharacter = line[i+len(stopMark)]
}
// check valid ending character
isValidEndingChar := isPunctuation(succeedingCharacter) || isParenthesesClose(succeedingCharacter) ||
succeedingCharacter == ' ' || succeedingCharacter == '\n' || succeedingCharacter == 0
if checkSurrounding && !isValidEndingChar {
break
}
ender = i
break
}
if line[i] == '\\' {
i++
continue
}
switch line[i] {
case '{':
depth++
case '}':
depth--
}
}
if ender == -1 {
return nil
}
block.Advance(opener)
_, pos := block.Position()
node := NewInline()
segment := pos.WithStop(pos.Start + ender - opener)
node.AppendChild(node, ast.NewRawTextSegment(segment))
block.Advance(ender - opener + len(stopMark))
trimBlock(node, block)
return node
}
func trimBlock(node *Inline, block text.Reader) {
if node.IsBlank(block.Source()) {
return
}
// trim first space and last space
first := node.FirstChild().(*ast.Text)
if !(!first.Segment.IsEmpty() && block.Source()[first.Segment.Start] == ' ') {
return
}
last := node.LastChild().(*ast.Text)
if !(!last.Segment.IsEmpty() && block.Source()[last.Segment.Stop-1] == ' ') {
return
}
first.Segment = first.Segment.WithStart(first.Segment.Start + 1)
last.Segment = last.Segment.WithStop(last.Segment.Stop - 1)
}
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