dmd.printast source code

1 /**
2  * Provides an AST printer for debugging.
3  *
4  * Copyright:   Copyright (C) 1999-2020 by The D Language Foundation, All Rights Reserved
5  * Authors:     $(LINK2 http://www.digitalmars.com, Walter Bright)
6  * License:     $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
7  * Source:      $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/printast.d, _printast.d)
8  * Documentation:  https://dlang.org/phobos/dmd_printast.html
9  * Coverage:    https://codecov.io/gh/dlang/dmd/src/master/src/dmd/printast.d
10  */
11 
12 module dmd.printast;
13 
14 import core.stdc.stdio;
15 
16 import dmd.expression;
17 import dmd.tokens;
18 import dmd.visitor;
19 
20 /********************
21  * Print AST data structure in a nice format.
22  * Params:
23  *  e = expression AST to print
24  *  indent = indentation level
25  */
26 void printAST(Expression e, int indent = 0)
27 {
28     scope PrintASTVisitor pav = new PrintASTVisitor(indent);
29     e.accept(pav);
30 }
31 
32 private:
33 
34 extern (C++) final class PrintASTVisitor : Visitor
35 {
36     alias visit = Visitor.visit;
37 
38     int indent;
39 
40     extern (D) this(int indent)
41     {
42         this.indent = indent;
43     }
44 
45     override void visit(Expression e)
46     {
47         printIndent(indent);
48         printf("%s %s\n", Token.toChars(e.op), e.type ? e.type.toChars() : "");
49     }
50 
51     override void visit(StructLiteralExp e)
52     {
53         printIndent(indent);
54         printf("%s %s, %s\n", Token.toChars(e.op), e.type ? e.type.toChars() : "", e.toChars());
55     }
56 
57     override void visit(SymbolExp e)
58     {
59         visit(cast(Expression)e);
60         printIndent(indent + 2);
61         printf(".var: %s\n", e.var ? e.var.toChars() : "");
62     }
63 
64     override void visit(DsymbolExp e)
65     {
66         visit(cast(Expression)e);
67         printIndent(indent + 2);
68         printf(".s: %s\n", e.s ? e.s.toChars() : "");
69     }
70 
71     override void visit(DotIdExp e)
72     {
73         visit(cast(Expression)e);
74         printIndent(indent + 2);
75         printf(".ident: %s\n", e.ident.toChars());
76         printAST(e.e1, indent + 2);
77     }
78 
79     override void visit(UnaExp e)
80     {
81         visit(cast(Expression)e);
82         printAST(e.e1, indent + 2);
83     }
84 
85     override void visit(BinExp e)
86     {
87         visit(cast(Expression)e);
88         printAST(e.e1, indent + 2);
89         printAST(e.e2, indent + 2);
90     }
91 
92     override void visit(DelegateExp e)
93     {
94         visit(cast(Expression)e);
95         printIndent(indent + 2);
96         printf(".func: %s\n", e.func ? e.func.toChars() : "");
97     }
98 
99     static void printIndent(int indent)
100     {
101         foreach (i; 0 .. indent)
102             putc(' ', stdout);
103     }
104 }
105 
106