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Merge pull request #8 from askonomm/7-implement-comparison-expression…
…s-in-if-and-unless Implement expression validator.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| using System.Data; | ||
| using System.Text.RegularExpressions; | ||
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||
| namespace Htmt; | ||
|
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| public class ExpressionValidator(string expression) | ||
| { | ||
| public bool Validates(Dictionary<string, object?> data) | ||
| { | ||
| return EvaluateExp(Normalize(data)); | ||
| } | ||
|
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| private string Normalize(Dictionary<string, object?> data) | ||
| { | ||
| var evaluatedExpression = expression; | ||
| var keyMatches = Regex.Matches(expression, """'(?<string>[^']*)'|(?<key>\w+)"""); | ||
|
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| foreach (Match match in keyMatches) | ||
| { | ||
| // if this is not a key, skip | ||
| if (match.Groups["key"].Success == false) continue; | ||
|
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| var key = match.Groups["key"].Value; | ||
|
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| // skip if the key is an operator | ||
| if (key is "is" or "and" or "or" or "not") continue; | ||
|
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| // skip if key is integer, double, float, boolean, null or string | ||
| if (int.TryParse(key, out _)) continue; | ||
| if (double.TryParse(key, out _)) continue; | ||
| if (float.TryParse(key, out _)) continue; | ||
| if (bool.TryParse(key, out _)) continue; | ||
| if (key == "null") continue; | ||
|
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| var value = Helper.FindValueByKeys(data, key.Split('.')); | ||
| var regex = new Regex($@"{key}"); | ||
|
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| // if value is bool, lowercase it | ||
| if (value is bool b) | ||
| { | ||
| evaluatedExpression = regex.Replace(evaluatedExpression, b.ToString().ToLower(), 1); | ||
| continue; | ||
| } | ||
|
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| evaluatedExpression = regex.Replace(evaluatedExpression, value?.ToString() ?? "null", 1); | ||
| } | ||
|
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| // remove single quotes from string values | ||
| return Regex.Replace(evaluatedExpression, "'(.*?)'", "$1"); | ||
| } | ||
|
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| private static bool EvaluateExp(string exp) | ||
| { | ||
| while (exp.Contains('(')) | ||
| { | ||
| var openIndex = exp.LastIndexOf('('); | ||
| var closeIndex = exp.IndexOf(')', openIndex); | ||
|
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| if (openIndex == -1 || closeIndex == -1) | ||
| { | ||
| throw new SyntaxErrorException("Invalid expression"); | ||
| } | ||
|
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| var subExp = exp.Substring(openIndex + 1, closeIndex - openIndex - 1); | ||
| var subResult = EvaluateSimpleExp(subExp); | ||
|
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| exp = exp.Substring(0, openIndex) + subResult.ToString().ToLower() + exp.Substring(closeIndex + 1); | ||
| } | ||
|
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| return EvaluateSimpleExp(exp); | ||
| } | ||
|
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| private static bool EvaluateSimpleExp(string exp) | ||
| { | ||
| var orParts = exp.Split(new[] { " or " }, StringSplitOptions.None); | ||
|
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| foreach (var orPart in orParts) | ||
| { | ||
| var andParts = orPart.Split([" and "], StringSplitOptions.None); | ||
| var andResult = true; | ||
|
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| foreach (var andPart in andParts) | ||
| { | ||
| andResult &= EvaluateCondition(andPart.Trim()); | ||
| } | ||
|
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| if (andResult) return true; | ||
| } | ||
|
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| return false; | ||
| } | ||
|
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| private static bool EvaluateCondition(string condition) | ||
| { | ||
| if (condition == "true") return true; | ||
| if (condition == "false") return false; | ||
|
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| if (condition.Contains(" is ")) | ||
| { | ||
| var parts = condition.Split([" is "], StringSplitOptions.None); | ||
| var key = parts[0].Trim(); | ||
| var value = parts[1].Trim(); | ||
|
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| return key == value; | ||
| } | ||
|
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| if (condition.Contains(" not ")) | ||
| { | ||
| var parts = condition.Split([" not "], StringSplitOptions.None); | ||
| var key = parts[0].Trim(); | ||
| var value = parts[1].Trim(); | ||
|
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| return key != value; | ||
| } | ||
|
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| throw new SyntaxErrorException("Invalid condition"); | ||
| } | ||
| } |
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