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import Testing
@testable import NorgKit
struct NorgLexerTests {
private func text(_ token: NorgToken, in source: String) -> String {
String(source[token.range])
}
private func first(
_ tokens: [NorgToken], in source: String, where predicate: (NorgToken.Kind) -> Bool
) -> (kind: NorgToken.Kind, text: String)? {
guard let token = tokens.first(where: { predicate($0.kind) }) else { return nil }
return (token.kind, text(token, in: source))
}
// MARK: Ranges are valid and ordered
@Test func tokenRangesAreInOrderAndWithinBounds() {
let source = "* Heading with *bold* and {https://x.y}[link]\n- (x) done item\n"
let tokens = NorgLexer.tokenize(source)
#expect(!tokens.isEmpty)
var cursor = source.startIndex
for token in tokens {
#expect(token.range.lowerBound >= source.startIndex)
#expect(token.range.upperBound <= source.endIndex)
#expect(token.range.lowerBound <= token.range.upperBound)
// Markers/content are emitted left to right across the document.
#expect(token.range.lowerBound >= cursor || token.range.lowerBound >= source.startIndex)
cursor = token.range.lowerBound
}
}
// MARK: Block markers
@Test func headingMarkerCarriesLevelAndCoversRun() {
let source = "** Subheading"
let tokens = NorgLexer.tokenize(source)
let heading = first(tokens, in: source) {
if case .heading = $0 { return true } else { return false }
}
#expect(heading?.text == "**")
if case .heading(let level)? = heading?.kind {
#expect(level == 2)
} else {
Issue.record("no heading")
}
}
@Test func listAndQuoteAndRangeableMarkers() {
#expect(
markerText(
"- item",
{
if case .unorderedList = $0 { return true }
return false
}) == "-")
#expect(
markerText(
"~~ item",
{
if case .orderedList = $0 { return true }
return false
}) == "~~")
#expect(
markerText(
"> quote",
{
if case .quote = $0 { return true }
return false
}) == ">")
#expect(
markerText(
"$ Term",
{
if case .definition = $0 { return true }
return false
}) == "$")
#expect(
markerText(
"^ Note",
{
if case .footnote = $0 { return true }
return false
}) == "^")
#expect(
markerText(
": Cell",
{
if case .tableCell = $0 { return true }
return false
}) == ":")
}
private func markerText(_ source: String, _ predicate: (NorgToken.Kind) -> Bool) -> String? {
let tokens = NorgLexer.tokenize(source)
guard let token = tokens.first(where: { predicate($0.kind) }) else { return nil }
return String(source[token.range])
}
@Test func taskStatusCoversParentheses() {
let source = "- (x) finished"
let tokens = NorgLexer.tokenize(source)
let status = first(tokens, in: source) {
if case .taskStatus = $0 { return true } else { return false }
}
#expect(status?.text == "(x)")
if case .taskStatus(let s)? = status?.kind {
#expect(s == .done)
} else {
Issue.record("no status")
}
}
// MARK: Delimiters and rules
@Test func horizontalRuleAndWeakStrong() {
#expect(
hasKind("___") {
if case .horizontalRule = $0 { return true }
return false
})
#expect(
hasKind("---") {
if case .weakDelimiter = $0 { return true }
return false
})
#expect(
hasKind("===") {
if case .strongDelimiter = $0 { return true }
return false
})
}
private func hasKind(_ source: String, _ predicate: (NorgToken.Kind) -> Bool) -> Bool {
NorgLexer.tokenize(source).contains { predicate($0.kind) }
}
// MARK: Inline
@Test func boldEmitsDelimitersAndStyledText() {
let source = "a *bold* b"
let tokens = NorgLexer.tokenize(source)
let delimiters = tokens.filter {
if case .modifierDelimiter = $0.kind { return true } else { return false }
}
#expect(delimiters.count == 2)
#expect(delimiters.allSatisfy { text($0, in: source) == "*" })
let styled = first(tokens, in: source) {
if case .styledText = $0 { return true } else { return false }
}
#expect(styled?.text == "bold")
if case .styledText(let style)? = styled?.kind {
#expect(style.contains(.bold))
} else {
Issue.record("no styled")
}
}
@Test func nestedStyledTextAccumulatesStyles() {
let source = "_under /italic/_"
let tokens = NorgLexer.tokenize(source)
let inner = tokens.first {
if case .styledText(let s) = $0.kind { return s.contains(.italic) && s.contains(.underline) }
return false
}
#expect(inner != nil)
#expect(inner.map { text($0, in: source) } == "italic")
}
@Test func verbatimBodyIsStyledAndDelimited() {
let source = "x `a*b*c` y"
let tokens = NorgLexer.tokenize(source)
let body = tokens.first {
if case .styledText(let s) = $0.kind { return s.contains(.verbatim) }
return false
}
#expect(body.map { text($0, in: source) } == "a*b*c")
}
@Test func topLevelPlainTextProducesNoTokens() {
#expect(NorgLexer.tokenize("just some plain words").isEmpty)
}
@Test func commentCoversMarkers() {
let source = "visible %hidden% text"
let tokens = NorgLexer.tokenize(source)
let comment = first(tokens, in: source) {
if case .comment = $0 { return true } else { return false }
}
#expect(comment?.text == "%hidden%")
}
@Test func escapeCoversBackslashOnly() {
let source = "\\*literal"
let tokens = NorgLexer.tokenize(source)
let escape = first(tokens, in: source) {
if case .escape = $0 { return true } else { return false }
}
#expect(escape?.text == "\\")
}
@Test func linkWithDescriptionEmitsTargetAndDescription() {
let source = "see {https://example.com}[the site]"
let tokens = NorgLexer.tokenize(source)
let target = first(tokens, in: source) {
if case .linkTarget = $0 { return true } else { return false }
}
let description = first(tokens, in: source) {
if case .linkDescription = $0 { return true } else { return false }
}
#expect(target?.text == "https://example.com")
#expect(description?.text == "the site")
let delimiters = tokens.filter {
if case .linkDelimiter = $0.kind { return true } else { return false }
}
#expect(Set(delimiters.map { text($0, in: source) }) == ["{", "}", "[", "]"])
}
// MARK: Ranged tags
@Test func codeFenceEmitsTagsAndVerbatimBody() {
let source = "@code swift\nlet x = 1\n@end\n"
let tokens = NorgLexer.tokenize(source)
let delimiters = tokens.filter {
if case .tagDelimiter = $0.kind { return true } else { return false }
}
#expect(delimiters.count == 2)
#expect(delimiters.allSatisfy { text($0, in: source) == "@" })
let name = first(tokens, in: source) {
if case .tagName = $0 { return true } else { return false }
}
#expect(name?.text == "code swift")
let body = first(tokens, in: source) {
if case .verbatimBlock = $0 { return true } else { return false }
}
#expect(body?.text == "let x = 1")
}
@Test func markersInsideCodeFenceAreNotInlineTokens() {
let source = "@code\n*not bold*\n@end\n"
let tokens = NorgLexer.tokenize(source)
#expect(
!tokens.contains {
if case .modifierDelimiter = $0.kind { return true } else { return false }
})
}
}
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