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Implement escaped character support in Markdown tokenizer #9

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Merged
merged 1 commit into from
Jul 14, 2025
Merged

Implement escaped character support in Markdown tokenizer #9

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14 changes: 12 additions & 2 deletions Sources/SwiftParser/Languages/MarkdownLanguage.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -126,7 +126,17 @@ public struct MarkdownLanguage: CodeLanguage {
func add(_ t: Token) { tokens.append(t) }
while index < input.endIndex {
let ch = input[index]
if ch == "#" {
if ch == "\\" {
let start = index
advance()
if index < input.endIndex {
let escaped = input[index]
advance()
add(.text(String(escaped), start..<index))
} else {
add(.text("\\", start..<index))
}
} else if ch == "#" {
let start = index
advance()
add(.hash(start..<index))
Expand Down Expand Up @@ -215,7 +225,7 @@ public struct MarkdownLanguage: CodeLanguage {
let start = index
while index < input.endIndex &&
input[index] != "\n" &&
!"#-*+_`[].()<>!~|;&=".contains(input[index]) &&
!"#-*+_`[].()<>!~|;&=\\".contains(input[index]) &&
!input[index].isNumber {
advance()
}
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9 changes: 9 additions & 0 deletions Tests/SwiftParserTests/SwiftParserTests.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,15 @@ final class SwiftParserTests: XCTestCase {
XCTAssertEqual(result.root.children.first?.type as? MarkdownLanguage.Element, .image)
}

func testMarkdownEscapedCharacters() {
let parser = SwiftParser()
let source = "\\*not italic\\*"
let result = parser.parse(source, language: MarkdownLanguage())
XCTAssertEqual(result.errors.count, 0)
XCTAssertEqual(result.root.children.count, 1)
XCTAssertEqual(result.root.children.first?.value, "*not italic*")
}

func testPrattExpression() {
let parser = SwiftParser()
let source = "x = 1 + 2 * 3"
Expand Down