83 lines
2.9 KiB
Swift
83 lines
2.9 KiB
Swift
extension PureYAML.Parsing.Scanner {
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func scanDirectiveOrDocumentMarker(_ state: inout State) throws -> Bool {
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guard state.indentation.last == 0 else {
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return false
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}
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if state.reader.peek() == "%" {
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try scanDirective(&state)
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return true
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}
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if state.reader.peek() == "#" {
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return false
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}
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if startsWith("---", state.reader), isIndicatorBoundary(state.reader.peek(offset: 3)) {
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scanDocumentMarker(.documentStart, state: &state)
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resetForDocumentStart(&state)
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return true
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}
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if startsWith("...", state.reader), isIndicatorBoundary(state.reader.peek(offset: 3)) {
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guard !state.isDocumentClosed else {
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throw PureYAML.Parsing.ParseError.unsupportedMultiDocumentStream(line: state.reader.mark.line)
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}
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scanDocumentMarker(.documentEnd, state: &state)
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resetForDocumentEnd(&state)
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return true
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}
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guard !state.isDocumentClosed else {
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throw PureYAML.Parsing.ParseError.unsupportedMultiDocumentStream(line: state.reader.mark.line)
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}
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return false
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}
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func scanDocumentMarker(
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_ kind: PureYAML.Parsing.TokenKind,
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state: inout State,
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) {
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let start = state.reader.mark
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state.reader.advance()
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state.reader.advance()
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state.reader.advance()
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state.append(kind, mark: start, endMark: state.reader.mark)
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skipLine(&state)
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}
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func resetForDocumentStart(_ state: inout State) {
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state.hasDocumentContent = false
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state.hasDocumentStartMarker = true
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state.isDocumentClosed = false
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}
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func resetForDocumentEnd(_ state: inout State) {
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state.hasDocumentContent = false
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state.hasDocumentStartMarker = false
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state.isDocumentClosed = true
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}
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func scanDirective(_ state: inout State) throws {
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let start = state.reader.mark
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let line = state.reader.consume { character in
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!isLineBreak(character)
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}
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let parts = line.split(separator: " ").map(String.init)
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guard let name = parts.first else {
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return
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}
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guard !state.hasDocumentContent, !state.hasDocumentStartMarker, !state.isDocumentClosed else {
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throw PureYAML.Parsing.ParseError.unsupportedDirective(name: name, line: start.line)
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}
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switch name {
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case "%YAML":
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guard parts.indices.contains(1), parts[1] == "1.1" || parts[1] == "1.2" else {
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throw PureYAML.Parsing.ParseError.incompatibleYAMLDirective(line: start.line)
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}
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case "%TAG":
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guard parts.count >= 3 else {
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return
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}
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state.tagHandles[parts[1]] = parts[2]
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default:
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throw PureYAML.Parsing.ParseError.unsupportedDirective(name: name, line: start.line)
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}
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}
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}
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