Overview

DScanner is a tool for analyzing D source code

Usage

The following examples assume that we are analyzing a simple file called helloworld.d

import std.stdio;
void main(string[] args)
{
	writeln("Hello World");
}

Token Count

The "--tokenCount" or "-t" option prints the number of tokens in the given file

$ dscanner --tokencount helloworld.d
20

Import Listing

The "--imports" or "-i" option prints a listing of modules imported by the given source file.

$ dscanner --imports helloworld.d
std.stdio

Line of Code Count

The "--sloc" or "-l" option prints the number of lines of code in the file. Instead of simply printing the number of line breaks, this counts the number of semicolon, while, if, do, else, switch, for, foreach, foreach_reverse, default, and case tokens in the file.

$ ./dscanner --sloc helloworld.d
2

CTAGS output

The "--ctags" or "-c" option generates CTAGS information and writes it to the standard output. When used with the "--recursive", "-R", or "-r" option, CTAGS information will be generated for a specified directory and all of its sub-directories.

$ dscanner --ctags helloworld.d
!_TAG_FILE_FORMAT	2
!_TAG_FILE_SORTED	1
!_TAG_FILE_AUTHOR	Brian Schott
!_TAG_PROGRAM_URL	https://github.com/Hackerpilot/Dscanner/
main	helloworld.d	3;"	f	arity:1

CTAGS output uses the following tag kinds:

• g -- enum declarataion
• e -- enum member
• v -- variable declaration
• i -- interface declaration
• c -- class declaration
• s -- struct declaration
• f -- function declaration
• u -- union declaration
• T -- template declaration

More information on the CTAGS format can be found here.

AST Dump

The "--ast" or "--xml" options will dump the complete abstract syntax tree of the given source file to standard output in XML format. JSON output is planned but not yet implemented.

$ dscanner --ast helloworld.d
<module>
<declaration>
<importDeclaration>
<singleImport>
<identifierChain>
<identifier>std</identifier>
<identifier>stdio</identifier>
</identifierChain>
</singleImport>
</importDeclaration>
</declaration>
<declaration>
<functionDeclaration line="3">
<name>main</name>
<type pretty="void">
<type2>
void
</type2>
</type>
<parameters>
<parameter>
<name>args</name>
<type pretty="string[]">
<type2>
<symbol>
<identifierOrTemplateChain>
<identifierOrTemplateInstance>
<identifier>string</identifier>
</identifierOrTemplateInstance>
</identifierOrTemplateChain>
</symbol>
</type2>
<typeSuffix type="[]"/>
</type>
<identifier>args</identifier>
</parameter>
</parameters>
<functionBody>
<blockStatement>
<declarationsAndStatements>
<declarationOrStatement>
<statement>
<statementNoCaseNoDefault>
<expressionStatement>
<expression>
<assignExpression>
<functionCallExpression>
<unaryExpression>
<primaryExpression>
<identifierOrTemplateInstance>
<identifier>writeln</identifier>
</identifierOrTemplateInstance>
</primaryExpression>
</unaryExpression>
<arguments>
<argumentList>
<assignExpression>
<primaryExpression>
<stringLiteral>Hello World</stringLiteral>
</primaryExpression>
</assignExpression>
</argumentList>
</arguments>
</functionCallExpression>
</assignExpression>
</expression>
</expressionStatement>
</statementNoCaseNoDefault>
</statement>
</declarationOrStatement>
</declarationsAndStatements>
</blockStatement>
</functionBody>
</functionDeclaration>
</declaration>
</module>

Useful code

The source code for DScanner has a complete lexer, parser, and abstact syntax tree library for D code under the std/d/ directory. It is intended that these modules eventually end up in Phobos, so feel free to use them for your own D tools.