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ReplacingCandidateNamingService.cs
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ReplacingCandidateNamingService.cs
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using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Scaffolding.Internal;
using Microsoft.EntityFrameworkCore.Scaffolding.Metadata;
using RevEng.Common;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
namespace RevEng.Core
{
public class ReplacingCandidateNamingService : CandidateNamingService
{
private readonly List<Schema> customNameOptions;
private readonly bool preserveCasingUsingRegex;
private readonly bool usePrefixNaming;
public ReplacingCandidateNamingService(
List<Schema> customNameOptions,
bool preserveCasingUsingRegex = false,
bool usePrefixNaming = false)
{
this.customNameOptions = customNameOptions;
this.preserveCasingUsingRegex = preserveCasingUsingRegex;
this.usePrefixNaming = usePrefixNaming;
}
public override string GenerateCandidateIdentifier(DatabaseTable originalTable)
{
if (originalTable == null)
{
throw new ArgumentException("Argument is empty", nameof(originalTable));
}
var candidateStringBuilder = new StringBuilder();
var schema = GetSchema(originalTable.Schema);
if (schema == null)
{
return base.GenerateCandidateIdentifier(originalTable);
}
if (schema.UseSchemaName)
{
candidateStringBuilder.Append(GenerateIdentifier(originalTable.Schema));
}
var newTableName = string.Empty;
if (schema.Tables != null && schema.Tables.Exists(t => t.Name == originalTable.Name))
{
newTableName = schema.Tables.SingleOrDefault(t => t.Name == originalTable.Name)?.NewName;
}
else if (!string.IsNullOrEmpty(schema.TableRegexPattern) && schema.TablePatternReplaceWith != null)
{
if (preserveCasingUsingRegex)
{
newTableName = RegexNameReplace(schema.TableRegexPattern, originalTable.Name, schema.TablePatternReplaceWith);
}
else
{
newTableName = GenerateIdentifier(RegexNameReplace(schema.TableRegexPattern, originalTable.Name, schema.TablePatternReplaceWith));
}
}
else
{
newTableName = base.GenerateCandidateIdentifier(originalTable);
}
if (string.IsNullOrWhiteSpace(newTableName))
{
candidateStringBuilder.Append(GenerateIdentifier(originalTable.Name));
return candidateStringBuilder.ToString();
}
candidateStringBuilder.Append(newTableName);
return candidateStringBuilder.ToString();
}
public override string GenerateCandidateIdentifier(DatabaseColumn originalColumn)
{
ArgumentNullException.ThrowIfNull(originalColumn);
var candidateStringBuilder = new StringBuilder();
var schema = GetSchema(originalColumn.Table.Schema);
if (schema == null || schema.Tables == null)
{
return base.GenerateCandidateIdentifier(originalColumn);
}
var renamers = schema.Tables
.Where(t => t.Name == originalColumn.Table.Name && t.Columns != null)
.Select(t => t)
.ToList();
if (renamers.Count > 0)
{
var column = renamers
.SelectMany(c => c.Columns.Where(n => n.Name == originalColumn.Name))
.FirstOrDefault();
if (column != null)
{
candidateStringBuilder.Append(column.NewName);
return candidateStringBuilder.ToString();
}
}
var newColumnName = string.Empty;
if (!string.IsNullOrEmpty(schema.ColumnRegexPattern) && schema.ColumnPatternReplaceWith != null)
{
if (preserveCasingUsingRegex)
{
newColumnName = RegexNameReplace(schema.ColumnRegexPattern, originalColumn.Name, schema.ColumnPatternReplaceWith);
}
else
{
newColumnName = GenerateIdentifier(RegexNameReplace(schema.ColumnRegexPattern, originalColumn.Name, schema.ColumnPatternReplaceWith));
}
if (!string.IsNullOrWhiteSpace(newColumnName))
{
candidateStringBuilder.Append(newColumnName);
return candidateStringBuilder.ToString();
}
}
return base.GenerateCandidateIdentifier(originalColumn);
}
#if CORE80
public override string GetDependentEndCandidateNavigationPropertyName(IReadOnlyForeignKey foreignKey)
{
ArgumentNullException.ThrowIfNull(foreignKey);
if (!usePrefixNaming)
{
return base.GetDependentEndCandidateNavigationPropertyName(foreignKey);
}
var candidateName = FindCandidateNavigationName(foreignKey.Properties);
return !string.IsNullOrEmpty(candidateName) ? candidateName : foreignKey.PrincipalEntityType.ShortName();
}
private static string FindCandidateNavigationName(IEnumerable<IReadOnlyProperty> properties)
{
var count = properties.Count();
if (count == 0)
{
return string.Empty;
}
var firstProperty = properties.First();
return StripId(
count == 1
? firstProperty.Name
: FindCommonPrefix(firstProperty.Name, properties.Select(p => p.Name)));
}
private static string FindCommonPrefix(string firstName, IEnumerable<string> propertyNames)
{
var prefixLength = 0;
foreach (var c in firstName)
{
foreach (var s in propertyNames)
{
if (s.Length <= prefixLength
|| s[prefixLength] != c)
{
return firstName[..prefixLength];
}
}
prefixLength++;
}
return firstName[..prefixLength];
}
private static string StripId(string commonPrefix)
{
if (commonPrefix.Length < 3
|| !commonPrefix.EndsWith("id", StringComparison.OrdinalIgnoreCase))
{
return commonPrefix;
}
var ignoredCharacterCount = 2;
if (commonPrefix.Length > 4
&& commonPrefix.EndsWith("guid", StringComparison.OrdinalIgnoreCase))
{
ignoredCharacterCount = 4;
}
int i;
for (i = commonPrefix.Length - ignoredCharacterCount - 1; i >= 0; i--)
{
if (char.IsLetterOrDigit(commonPrefix[i]))
{
break;
}
}
return i != 0
? commonPrefix[..(i + 1)]
: commonPrefix;
}
#endif
private static string GenerateIdentifier(string value)
{
var candidateStringBuilder = new StringBuilder();
var previousLetterCharInWordIsLowerCase = false;
var isFirstCharacterInWord = true;
foreach (var c in value)
{
var isNotLetterOrDigit = !char.IsLetterOrDigit(c);
if (isNotLetterOrDigit
|| (previousLetterCharInWordIsLowerCase && char.IsUpper(c)))
{
isFirstCharacterInWord = true;
previousLetterCharInWordIsLowerCase = false;
if (isNotLetterOrDigit)
{
continue;
}
}
candidateStringBuilder.Append(
isFirstCharacterInWord ? char.ToUpperInvariant(c) : char.ToLowerInvariant(c));
isFirstCharacterInWord = false;
if (char.IsLower(c))
{
previousLetterCharInWordIsLowerCase = true;
}
}
return candidateStringBuilder.ToString();
}
private static string RegexNameReplace(string pattern, string originalName, string replacement, int timeout = 100)
{
string newName = string.Empty;
try
{
newName = Regex.Replace(originalName, pattern, replacement, RegexOptions.None, TimeSpan.FromMilliseconds(timeout));
}
catch (RegexMatchTimeoutException)
{
Console.WriteLine($"Regex pattern {pattern} time out when trying to match {originalName}, name won't be replaced");
}
return newName;
}
private Schema GetSchema(string originalSchema)
=> customNameOptions?.Find(x => x.SchemaName == originalSchema);
}
}