gcc/d/dmd/statement_rewrite_walker.d


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194

/**
 * Provides a visitor for statements that allows rewriting the currently visited node.
 *
 * Copyright:   Copyright (C) 1999-2022 by The D Language Foundation, All Rights Reserved
 * Authors:     $(LINK2 https://www.digitalmars.com, Walter Bright)
 * License:     $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
 * Source:      $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/statement_rewrite_walker.d, _statement_rewrite_walker.d)
 * Documentation:  https://dlang.org/phobos/dmd_statement_rewrite_walker.html
 * Coverage:    https://codecov.io/gh/dlang/dmd/src/master/src/dmd/statement_rewrite_walker.d
 */

module dmd.statement_rewrite_walker;

import core.stdc.stdio;

import dmd.statement;
import dmd.visitor;


/** A visitor to walk entire statements and provides ability to replace any sub-statements.
 */
extern (C++) class StatementRewriteWalker : SemanticTimePermissiveVisitor
{
    alias visit = SemanticTimePermissiveVisitor.visit;

    /* Point the currently visited statement.
     * By using replaceCurrent() method, you can replace AST during walking.
     */
    Statement* ps;

public:
    final void visitStmt(ref Statement s)
    {
        ps = &s;
        s.accept(this);
    }

    final void replaceCurrent(Statement s)
    {
        *ps = s;
    }

    override void visit(PeelStatement s)
    {
        if (s.s)
            visitStmt(s.s);
    }

    override void visit(CompoundStatement s)
    {
        if (s.statements && s.statements.dim)
        {
            for (size_t i = 0; i < s.statements.dim; i++)
            {
                if ((*s.statements)[i])
                    visitStmt((*s.statements)[i]);
            }
        }
    }

    override void visit(CompoundDeclarationStatement s)
    {
        visit(cast(CompoundStatement)s);
    }

    override void visit(UnrolledLoopStatement s)
    {
        if (s.statements && s.statements.dim)
        {
            for (size_t i = 0; i < s.statements.dim; i++)
            {
                if ((*s.statements)[i])
                    visitStmt((*s.statements)[i]);
            }
        }
    }

    override void visit(ScopeStatement s)
    {
        if (s.statement)
            visitStmt(s.statement);
    }

    override void visit(WhileStatement s)
    {
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(DoStatement s)
    {
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(ForStatement s)
    {
        if (s._init)
            visitStmt(s._init);
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(ForeachStatement s)
    {
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(ForeachRangeStatement s)
    {
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(IfStatement s)
    {
        if (s.ifbody)
            visitStmt(s.ifbody);
        if (s.elsebody)
            visitStmt(s.elsebody);
    }

    override void visit(SwitchStatement s)
    {
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(CaseStatement s)
    {
        if (s.statement)
            visitStmt(s.statement);
    }

    override void visit(CaseRangeStatement s)
    {
        if (s.statement)
            visitStmt(s.statement);
    }

    override void visit(DefaultStatement s)
    {
        if (s.statement)
            visitStmt(s.statement);
    }

    override void visit(SynchronizedStatement s)
    {
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(WithStatement s)
    {
        if (s._body)
            visitStmt(s._body);
    }

    override void visit(TryCatchStatement s)
    {
        if (s._body)
            visitStmt(s._body);
        if (s.catches && s.catches.dim)
        {
            for (size_t i = 0; i < s.catches.dim; i++)
            {
                Catch c = (*s.catches)[i];
                if (c && c.handler)
                    visitStmt(c.handler);
            }
        }
    }

    override void visit(TryFinallyStatement s)
    {
        if (s._body)
            visitStmt(s._body);
        if (s.finalbody)
            visitStmt(s.finalbody);
    }

    override void visit(DebugStatement s)
    {
        if (s.statement)
            visitStmt(s.statement);
    }

    override void visit(LabelStatement s)
    {
        if (s.statement)
            visitStmt(s.statement);
    }
}