88
99namespace Hl7 . Cql . CodeGeneration . NET
1010{
11- internal class VariableNameGenerator
11+ internal sealed class VariableNameGenerator
1212 {
13- private readonly object SyncRoot = new ( ) ;
14- public string Postfix { get ; }
13+ private readonly object _syncRoot = new ( ) ;
14+ private readonly List < char > _letters = [ ( char ) ( 'a' - 1 ) ] ;
15+ private readonly string _prefix = string . Empty ;
1516
16- private List < string > Reserved { get ; }
17-
18- private readonly List < char > Letters = [ ( char ) ( 'a' - 1 ) ] ;
19- private readonly string Prefix = string . Empty ;
17+ private string Postfix { get ; }
2018
19+ private List < string > Reserved { get ; }
2120
2221 /// <summary>
2322 /// Create a new VariableNameGenerator with an (optional) set of extra reserved variable names
@@ -30,9 +29,9 @@ public VariableNameGenerator ForNewScope(IEnumerable<ParameterExpression>? scope
3029 }
3130
3231 /// <inheritdoc cref="ForNewScope(IEnumerable{ParameterExpression}?)"/>
33- public VariableNameGenerator ForNewScope ( IEnumerable < string > ? scopeNames )
32+ private VariableNameGenerator ForNewScope ( IEnumerable < string > ? scopeNames )
3433 {
35- var newGenerator = new VariableNameGenerator ( Letters , Reserved . Concat ( scopeNames ?? [ ] ) , Postfix ) ;
34+ var newGenerator = new VariableNameGenerator ( _letters , Reserved . Concat ( scopeNames ?? [ ] ) , Postfix ) ;
3635 return newGenerator ;
3736 }
3837
@@ -42,109 +41,50 @@ public VariableNameGenerator(IEnumerable<string>? reserved = null, string postfi
4241 Postfix = postfix ;
4342 }
4443
45- public VariableNameGenerator ( IEnumerable < ParameterExpression > reserved , string postfix = "" ) :
46- this ( reserved . Where ( p => p . Name is not null ) . Select ( p => p . Name ! ) , postfix )
47- {
48- // Nothing
49- }
50-
51- internal VariableNameGenerator ( List < char > state , IEnumerable < string > ? reserved = null , string postfix = "" )
44+ private VariableNameGenerator ( List < char > state , IEnumerable < string > ? reserved = null , string postfix = "" )
5245 {
5346 Reserved = reserved ? . ToList ( ) ?? [ ] ;
5447 Postfix = postfix ;
55- Letters = state ;
48+ _letters = state ;
5649 }
5750
58- public virtual string Next ( )
51+ public string Next ( )
5952 {
60- lock ( SyncRoot )
53+ lock ( _syncRoot )
6154 {
6255 string vn = "" ;
6356 do
6457 {
65- var lastIndex = Letters . Count - 1 ;
66- var next = ( char ) ( Letters [ lastIndex ] + 1 ) ;
58+ var lastIndex = _letters . Count - 1 ;
59+ var next = ( char ) ( _letters [ lastIndex ] + 1 ) ;
6760 if ( next > 'z' )
6861 {
6962 next = 'a' ;
70- Letters [ lastIndex ] = next ;
71- if ( Letters . Count > 1 )
63+ _letters [ lastIndex ] = next ;
64+ if ( _letters . Count > 1 )
7265 {
73- if ( Letters [ 0 ] == 'z' )
66+ if ( _letters [ 0 ] == 'z' )
7467 {
75- Letters . Insert ( 0 , 'a' ) ;
68+ _letters . Insert ( 0 , 'a' ) ;
7669 }
7770 else
7871 {
79- Letters [ 0 ] = ( char ) ( Letters [ 0 ] + 1 ) ;
72+ _letters [ 0 ] = ( char ) ( _letters [ 0 ] + 1 ) ;
8073 }
8174 }
82- else Letters . Insert ( 0 , 'a' ) ;
75+ else _letters . Insert ( 0 , 'a' ) ;
8376 }
8477 else
8578 {
86- Letters [ lastIndex ] = next ;
79+ _letters [ lastIndex ] = next ;
8780 }
88- vn = $ "{ Prefix } { new string ( Letters . ToArray ( ) ) } { Postfix } ";
81+ vn = $ "{ _prefix } { new string ( _letters . ToArray ( ) ) } { Postfix } ";
8982 }
9083 while ( Reserved . Contains ( vn ) || SyntaxFacts . GetKeywordKind ( vn ) != SyntaxKind . None ) ;
9184
9285 return vn ;
9386 }
9487 }
9588
96- public static string ? NormalizeIdentifier ( string ? identifier )
97- {
98- if ( string . IsNullOrEmpty ( identifier ) )
99- return null ;
100-
101- ReadOnlySpan < char > span = identifier . AsSpan ( ) ;
102-
103- int leadingUnderscoreCount = 0 ;
104- while ( leadingUnderscoreCount < span . Length && span [ leadingUnderscoreCount ] == '_' )
105- leadingUnderscoreCount ++ ;
106-
107- if ( leadingUnderscoreCount > 0 )
108- span = span [ leadingUnderscoreCount ..] ;
109-
110- if ( span . Length > 0 && span [ 0 ] == '$' )
111- span = span [ 1 ..] ;
112-
113- Span < char > buffer = stackalloc char [ span . Length + 2 ] ;
114- int bufferIndex = 0 ;
115-
116- foreach ( var c in span )
117- {
118- switch ( c )
119- {
120- case '"' :
121- case '\' ' :
122- continue ;
123- case '&' :
124- buffer [ bufferIndex ++ ] = 'a' ;
125- buffer [ bufferIndex ++ ] = 'n' ;
126- buffer [ bufferIndex ++ ] = 'd' ;
127- continue ;
128- default :
129- buffer [ bufferIndex ++ ] = SyntaxFacts . IsIdentifierPartCharacter ( c ) ? c : '_' ;
130- break ;
131- }
132- }
133-
134- var normalized = buffer [ ..bufferIndex ] . ToString ( ) ;
135-
136- if ( normalized . Length > 0 && ! SyntaxFacts . IsIdentifierStartCharacter ( normalized [ 0 ] ) )
137- //normalized = "_" + normalized;
138- leadingUnderscoreCount ++ ;
139-
140- if ( leadingUnderscoreCount > 0 )
141- normalized = new string ( '_' , leadingUnderscoreCount ) + normalized ;
142-
143- if ( SyntaxFacts . GetKeywordKind ( normalized ) != SyntaxKind . None )
144- normalized = $ "@{ normalized } ";
145-
146- return normalized ;
147- }
148-
14989 }
15090}
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