84 lines
2.5 KiB
Swift
84 lines
2.5 KiB
Swift
public class TemplateDoesNotExist: Error, CustomStringConvertible {
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let templateNames: [String]
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let loader: Loader?
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public init(templateNames: [String], loader: Loader? = nil) {
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self.templateNames = templateNames
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self.loader = loader
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}
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public var description: String {
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let templates = templateNames.joined(separator: ", ")
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if let loader = loader {
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return "Template named `\(templates)` does not exist in loader \(loader)"
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}
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return "Template named `\(templates)` does not exist. No loaders found"
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}
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}
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public struct TemplateSyntaxError : Error, Equatable, CustomStringConvertible {
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public let reason: String
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public var description: String { return reason }
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public internal(set) var token: Token?
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public internal(set) var stackTrace: [Token]
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public var templateName: String? { return token?.sourceMap.filename }
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var allTokens: [Token] {
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return stackTrace + (token.map({ [$0] }) ?? [])
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}
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public init(reason: String, token: Token? = nil, stackTrace: [Token] = []) {
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self.reason = reason
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self.stackTrace = stackTrace
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self.token = token
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}
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public init(_ description: String) {
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self.init(reason: description)
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}
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}
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extension Error {
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func withToken(_ token: Token?) -> Error {
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if var error = self as? TemplateSyntaxError {
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error.token = error.token ?? token
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return error
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} else {
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return TemplateSyntaxError(reason: "\(self)", token: token)
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}
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}
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}
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public protocol ErrorReporter: class {
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func renderError(_ error: Error) -> String
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}
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open class SimpleErrorReporter: ErrorReporter {
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open func renderError(_ error: Error) -> String {
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guard let templateError = error as? TemplateSyntaxError else { return error.localizedDescription }
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func describe(token: Token) -> String {
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let templateName = token.sourceMap.filename ?? ""
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let location = token.sourceMap.location
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let highlight = """
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\(String(Array(repeating: " ", count: location.lineOffset)))\
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^\(String(Array(repeating: "~", count: max(token.contents.count - 1, 0))))
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"""
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return """
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\(templateName)\(location.lineNumber):\(location.lineOffset): error: \(templateError.reason)
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\(location.content)
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\(highlight)
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"""
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}
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var descriptions = templateError.stackTrace.reduce([]) { $0 + [describe(token: $1)] }
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let description = templateError.token.map(describe(token:)) ?? templateError.reason
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descriptions.append(description)
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return descriptions.joined(separator: "\n")
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}
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}
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