TREND parsing #123
TREND parsing #123
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WalkthroughThis pull request integrates trend forecast data into the ATIS message generation workflow and refines METAR decoding. Trend information is now included in both voice and text weather strings, with corresponding adjustments in the ATIS builder. The trend parsing logic is enhanced in the TrendNode and TrendChunkDecoder classes through added methods, null checks, and updated regex patterns. Additionally, the underlying weather data model is expanded with new properties to capture more detailed forecast information. Changes
Sequence Diagram(s)sequenceDiagram
participant MA as METAR Source
participant TDC as TrendChunkDecoder
participant TN as TrendNode
participant AB as AtisBuilder
MA->>TDC: Provide raw METAR string
TDC-->>TN: Return parsed trend forecast (current & future)
TN->>TN: Process forecast with ProcessTrendForecast & GetChunkResult
TN-->>AB: Supply processed trend data (voice/text)
AB->>AB: Append trend info to completeWxStringVoice and completeWxStringAcars
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Actionable comments posted: 1
🔭 Outside diff range comments (1)
vATIS.Desktop/Weather/Decoder/ChunkDecoder/TrendChunkDecoder.cs (1)
58-159: Ensure safe access to the 'found' collection to preventIndexOutOfRangeExceptionThe code accesses the
foundcollection using fixed indices (e.g.,found[17].Value) without checking if these indices exist. If the regex does not capture all groups, this could lead to anIndexOutOfRangeException.Consider validating the
found.Countbefore accessing specific indices:if (found.Count > expectedIndex) { // Safe to access found[expectedIndex] }Alternatively, adjust your logic to handle cases where certain groups may not be present, ensuring robust error handling and preventing runtime exceptions.
🧹 Nitpick comments (4)
vATIS.Desktop/Weather/Decoder/ChunkDecoder/TrendChunkDecoder.cs (2)
60-105: Consider refactoring to eliminate duplicated code when parsing trend forecastsThe parsing logic for
firstTrendandfutureTrendis nearly identical. Refactoring the duplicated code into a separate method would enhance maintainability and reduce potential errors due to code duplication.You could create a helper method to parse a trend forecast from the matched groups:
private TrendForecast ParseTrendForecast(GroupCollection found, int startIndex) { var trend = new TrendForecast { ChangeIndicator = found[startIndex].Value switch { "NOSIG" => TrendForecastType.NoSignificantChanges, "BECMG" => TrendForecastType.Becoming, "TEMPO" => TrendForecastType.Temporary, _ => throw new ArgumentException("Invalid ChangeIndicator"), }, }; if (!string.IsNullOrEmpty(found[startIndex + 1].Value)) { trend.AtTime = found[startIndex + 1].Value; } if (!string.IsNullOrEmpty(found[startIndex + 2].Value)) { trend.FromTime = found[startIndex + 2].Value; } if (!string.IsNullOrEmpty(found[startIndex + 3].Value)) { trend.UntilTime = found[startIndex + 3].Value; } if (!string.IsNullOrEmpty(found[startIndex + 4].Value)) { trend.SurfaceWind = found[startIndex + 4].Value + " "; } if (!string.IsNullOrEmpty(found[startIndex + 5].Value)) { trend.PrevailingVisibility = found[startIndex + 5].Value + " "; } if (!string.IsNullOrEmpty(found[startIndex + 6].Value)) { trend.WeatherCodes = found[startIndex + 6].Value + " "; } if (!string.IsNullOrEmpty(found[startIndex + 7].Value)) { trend.Clouds = found[startIndex + 7].Value + " "; } return trend; }Then, update your
Parsemethod to use this helper:if (found.Count > 1) { var firstTrend = ParseTrendForecast(found, 1); result.Add("TrendForecast", firstTrend); if (!string.IsNullOrEmpty(found[9].Value)) { var futureTrend = ParseTrendForecast(found, 10); result.Add("TrendForecastFuture", futureTrend); } }Also applies to: 110-155
86-105: Review the necessity of appending spaces to trend forecast propertiesAppending a space to each property value (e.g.,
found[5].Value + " ") may introduce unintended formatting issues. Verify if this extra space is necessary or if it can be omitted.If the extra space is not required, you can assign the values directly:
- firstTrend.SurfaceWind = found[5].Value + " "; + firstTrend.SurfaceWind = found[5].Value;vATIS.Desktop/Weather/Decoder/Entity/TrendForecast.cs (1)
105-123: Enhance the XML documentation for newly added propertiesThe XML comments for the new properties can be clarified for better understanding. For instance, the summary for
WeatherCodesrefers to "recent weather value," which may not accurately describe its purpose.Suggested improvements:
SurfaceWind:/// Gets or sets the surface wind from the TREND forecast. +/// Represents the surface wind information specified in the TREND forecast section of a METAR report.
PrevailingVisibility:/// Gets or sets the TREND prevailing visibility value. +/// Represents the prevailing visibility within the TREND forecast.
WeatherCodes:/// Gets or sets the recent weather value. +/// Gets or sets the weather codes indicating present weather phenomena in the TREND forecast.
Clouds:/// Gets or sets the cloud layer values. +/// Contains cloud layer information specified in the TREND forecast section.vATIS.Desktop/Weather/Decoder/ChunkDecoder/CloudChunkDecoder.cs (1)
27-35: Consider the implications of making regex pattern constants publicExposing
NoCloudRegexPatternandLayerRegexPatternas public constants increases the class's API surface area and may reveal internal implementation details. Evaluate whether these constants need to be public or if they can remain private to encapsulate the regex patterns within the class.If other classes require access to these patterns, consider creating a shared utility class or keeping the constants internal with appropriate access modifiers.
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📒 Files selected for processing (6)
vATIS.Desktop/Atis/AtisBuilder.cs(1 hunks)vATIS.Desktop/Atis/Nodes/TrendNode.cs(3 hunks)vATIS.Desktop/Weather/Decoder/ChunkDecoder/CloudChunkDecoder.cs(1 hunks)vATIS.Desktop/Weather/Decoder/ChunkDecoder/TrendChunkDecoder.cs(3 hunks)vATIS.Desktop/Weather/Decoder/Entity/DecodedMetar.cs(1 hunks)vATIS.Desktop/Weather/Decoder/Entity/TrendForecast.cs(1 hunks)
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🔇 Additional comments (6)
vATIS.Desktop/Weather/Decoder/ChunkDecoder/TrendChunkDecoder.cs (1)
43-47: Verify the correctness and efficiency of the combined regex patternThe regex pattern constructed in the
GetRegexmethod is complex, which may impact performance and maintainability. Ensure that the pattern accurately captures all intended METAR trend information and consider breaking it down for clarity.Consider writing unit tests to validate the regex against a variety of METAR trend inputs to confirm its correctness and optimize performance.
vATIS.Desktop/Weather/Decoder/Entity/DecodedMetar.cs (1)
218-221: LGTM! Well-documented property addition.The new
TrendForecastFutureproperty is properly documented and follows the same pattern as the existingTrendForecastproperty.vATIS.Desktop/Atis/Nodes/TrendNode.cs (3)
25-26: LGTM! Added null check for Station property.Early return if Station is null prevents potential NullReferenceException.
34-34: LGTM! Improved voice output clarity.Added "TREND," prefix to voice outputs for better clarity in ATIS broadcasts.
Also applies to: 38-38, 42-42
287-299: LGTM! Well-implemented helper method.The
GetChunkResultmethod effectively handles the extraction of parsed data from chunk results into theDecodedMetarobject using reflection.vATIS.Desktop/Atis/AtisBuilder.cs (1)
371-373: LGTM! Properly integrated trend information.The trend information is correctly concatenated with other weather information in both voice and text ATIS messages.
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Actionable comments posted: 0
🧹 Nitpick comments (3)
vATIS.Desktop/Weather/Decoder/ChunkDecoder/TrendChunkDecoder.cs (2)
42-49: Add documentation for the complex regex pattern.While the code is well-structured, the complex regex pattern could benefit from additional documentation explaining each component's purpose and the overall pattern structure.
Add XML documentation comments explaining the pattern structure:
public override string GetRegex() { + // Build regex patterns for each component: + // - windRegex: Matches surface wind information (direction, speed, variations, unit) var windRegex = $"{WindDirectionRegexPattern}{WindSpeedRegexPattern}{WindSpeedVariationsRegexPattern}{WindUnitRegexPattern}"; + // - visibilityRegex: Matches prevailing visibility or CAVOK var visibilityRegex = $"{VisibilityRegexPattern}|CAVOK"; + // - presentWeatherRegex: Matches weather phenomena with optional intensity and characteristics var presentWeatherRegex = $@"(?:[-+]|VC)?(?:{CaracRegexPattern})?(?:{TypeRegexPattern})?(?:{TypeRegexPattern})?(?:{TypeRegexPattern})?"; + // - cloudRegex: Matches cloud layers or special sky conditions var cloudRegex = $@"(?:{NoCloudRegexPattern}|(?:{LayerRegexPattern})(?: {LayerRegexPattern})?(?: {LayerRegexPattern})?(?: {LayerRegexPattern})?)"; + // Combine patterns to match the complete trend forecast structure return $@"TREND (TEMPO|BECMG|NOSIG)\s*(?:AT(\d{{4}}))?\s*(?:FM(\d{{4}}))?\s*(?:TL(\d{{4}}))?\s*({windRegex})?\s*({visibilityRegex})?\s*({presentWeatherRegex})?\s*({cloudRegex})?\s*((?=\s*(?:TEMPO|BECMG|NOSIG|$))(?:\s*(TEMPO|BECMG|NOSIG)\s*(?:AT(\d{{4}}))?\s*(?:FM(\d{{4}}))?\s*(?:TL(\d{{4}}))?\s*({windRegex})?\s*({visibilityRegex})?\s*({presentWeatherRegex})?\s*({cloudRegex})?)?)";
74-123: Simplify null checks and string handling.The method could be improved by:
- Using null-coalescing operators to simplify null checks
- Handling string concatenation more elegantly
Consider these improvements:
private TrendForecast ParseTrendForecast(List<Group> found, int startIndex) { var trend = new TrendForecast { ChangeIndicator = found[startIndex].Value switch { "NOSIG" => TrendForecastType.NoSignificantChanges, "BECMG" => TrendForecastType.Becoming, "TEMPO" => TrendForecastType.Temporary, _ => throw new ArgumentException("Invalid ChangeIndicator"), }, - }; + AtTime = found[startIndex + 1].Value, + FromTime = found[startIndex + 2].Value, + UntilTime = found[startIndex + 3].Value, + SurfaceWind = found[startIndex + 4].Value?.Trim(), + PrevailingVisibility = found[startIndex + 5].Value?.Trim(), + WeatherCodes = found[startIndex + 6].Value?.Trim(), + Clouds = found[startIndex + 7].Value?.Trim() + }; - if (!string.IsNullOrEmpty(found[startIndex + 1].Value)) - { - trend.AtTime = found[startIndex + 1].Value; - } - - if (!string.IsNullOrEmpty(found[startIndex + 2].Value)) - { - trend.FromTime = found[startIndex + 2].Value; - } - - if (!string.IsNullOrEmpty(found[startIndex + 3].Value)) - { - trend.UntilTime = found[startIndex + 3].Value; - } - - if (!string.IsNullOrEmpty(found[startIndex + 4].Value)) - { - trend.SurfaceWind = found[startIndex + 4].Value + " "; - } - - if (!string.IsNullOrEmpty(found[startIndex + 5].Value)) - { - trend.PrevailingVisibility = found[startIndex + 5].Value + " "; - } - - if (!string.IsNullOrEmpty(found[startIndex + 6].Value)) - { - trend.WeatherCodes = found[startIndex + 6].Value + " "; - } - - if (!string.IsNullOrEmpty(found[startIndex + 7].Value)) - { - trend.Clouds = found[startIndex + 7].Value + " "; - } return trend; }vATIS.Desktop/Atis/Nodes/TrendNode.cs (1)
53-65: Cache PropertyInfo objects for better performance.The method uses reflection to set property values, which can be slow. Consider caching the PropertyInfo objects to improve performance.
Consider this improvement:
public class TrendNode : BaseNode<TrendForecast> { + private static readonly Dictionary<string, System.Reflection.PropertyInfo?> PropertyCache = new(); + private static void GetChunkResult(Dictionary<string, object> chunkResult, DecodedMetar decodedMetar) { if (chunkResult.TryGetValue("Result", out var value) && value is Dictionary<string, object>) { if (value is Dictionary<string, object> result) { foreach (var obj in result) { - typeof(DecodedMetar).GetProperty(obj.Key)?.SetValue(decodedMetar, obj.Value, null); + if (!PropertyCache.TryGetValue(obj.Key, out var propertyInfo)) + { + propertyInfo = typeof(DecodedMetar).GetProperty(obj.Key); + PropertyCache[obj.Key] = propertyInfo; + } + propertyInfo?.SetValue(decodedMetar, obj.Value, null); } } } }
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📒 Files selected for processing (3)
vATIS.Desktop/Atis/Nodes/TrendNode.cs(3 hunks)vATIS.Desktop/Weather/Decoder/ChunkDecoder/TrendChunkDecoder.cs(3 hunks)vATIS.Desktop/Weather/Decoder/Entity/TrendForecast.cs(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
- vATIS.Desktop/Weather/Decoder/Entity/TrendForecast.cs
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🔇 Additional comments (4)
vATIS.Desktop/Weather/Decoder/ChunkDecoder/TrendChunkDecoder.cs (2)
24-40: LGTM! Well-structured regex pattern declarations.Breaking down complex regex patterns into smaller, named constants improves readability and maintainability.
52-72: LGTM! Clean and well-structured parsing logic.The method effectively handles both current and future trend forecasts by delegating to the new
ParseTrendForecastmethod.vATIS.Desktop/Atis/Nodes/TrendNode.cs (2)
20-39: LGTM! Clean and well-structured parsing logic.The method effectively handles both current and future trend forecasts by delegating to the new
ProcessTrendForecastmethod.
67-190: LGTM! Well-implemented trend forecast processing.The implementation effectively processes trend forecasts and matches the suggested refactor from past review comments.
Summary by CodeRabbit
New Features
Refactor