gamma.parsgen.lalr1.run.OrderedLR1TablesImpl source code

1 module gamma.parsgen.lalr1.run.OrderedLR1TablesImpl;
2 
3 import gamma.grammar.Alternative;
4 import gamma.grammar.Grammar;
5 import gamma.grammar.SymbolNode;
6 import gamma.grammar.Terminal;
7 import gamma.parsgen.lalr1.OrderedLR1Tables;
8 
9 /**
10  * An implementation suitable for use by an LR1 parser.
11  *
12  * @author SöKa
13  */
14 public class OrderedLR1TablesImpl : OrderedLR1Tables
15 {
16     private size_t stateCount_;
17 
18     private Grammar grammar_;
19 
20     private Action[][] parserActionRows;
21 
22     private Goto[][] gotoRows;
23 
24     private Terminal eof_;
25 
26     /**
27      * Constructor method.
28      */
29     public this(Grammar grammar, Action[][] parserActionRows, Goto[][] gotoRows)
30     in (grammar !is null)
31     in (parserActionRows.length == gotoRows.length)
32     {
33         this.grammar_ = grammar;
34         this.parserActionRows = parserActionRows;
35         this.gotoRows = gotoRows;
36         this.stateCount_ = parserActionRows.length;
37         this.eof_ =
38             cast(Terminal)(cast(SymbolNode)(cast(Alternative) this
39                 .grammar_
40                 .ruleOf(this.grammar_.startSymbol)
41                 .alternatives[0])
42                 .rhs[1])
43                 .symbol;
44     }
45 
46     /* (non-Javadoc)
47      * @see gamma.parsgen.lalr1.OrderedLR1Tables#eof
48      */
49     public Terminal eof()
50     {
51         return this.eof_;
52     }
53 
54     /* (non-Javadoc)
55      * @see gamma.parsgen.lalr1.OrderedLR1Tables#getSortedGotoRow(int)
56      */
57     public Goto[] getSortedGotoRow(size_t state)
58     {
59         return this.gotoRows[state];
60     }
61 
62     /* (non-Javadoc)
63      * @see gamma.parsgen.lalr1.OrderedLR1Tables#getSortedParserActionRow(int)
64      */
65     public Action[] getSortedParserActionRow(size_t state)
66     {
67         return this.parserActionRows[state];
68     }
69 
70     /* (non-Javadoc)
71      * @see gamma.parsgen.lalr1.OrderedLR1Tables#grammar
72      */
73     public Grammar grammar()
74     {
75         return this.grammar_;
76     }
77 
78     /* (non-Javadoc)
79      * @see gamma.parsgen.lalr1.OrderedLR1Tables#stateCount
80      */
81     public size_t stateCount()
82     {
83         return this.stateCount_;
84     }
85 }