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January 06, 2023
Gravatar of jonatjanoPosted by jonatjanoReply
jonatjano
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Hello,
I'm trying to write a script which parse a c header and then ouput basic bindings for multiple languages.

I read from the forum some times ago that the D compiler could be used as a library and found the lexer page in the documentation

but import dmd.lexer: Lexer fails with the following error :

modlibBinder.d(3): Error: unable to read module `lexer`
modlibBinder.d(3):        Expected 'dmd/lexer.d' or 'dmd/lexer/package.d' in one of the following import paths:
import path[0] = .
import path[1] = /usr/include/dmd/phobos
import path[2] = /usr/include/dmd/druntime/import
Failed: ["/usr/bin/dmd", "-v", "-o-", "modlibBinder.d", "-I."]

What are the steps to take to be able to call the lexer (and maybe also the parser) over a C header file ?

January 07, 2023
Gravatar of Richard (Rikki) Andrew CattermolePosted by Richard (Rikki) Andrew Cattermole
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Richard (Rikki) Andrew Cattermole
Gravatar of Richard (Rikki) Andrew Cattermole
Posted in reply to jonatjano


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Dmd is a separate code base and is not available in a regular D build.

You have to provide it and then link it in.

The easiest way to do it is by using dmd-fe via dub.

Examples: https://github.com/dlang/dmd/tree/master/compiler/test/dub_package

So something like this:

```json
{
	"name": "lexer_test",
	"dependencies": {
		"dmd:frontend": "~>2.101.0"
	}
}
```

source/lexer_test.d:

```d
module lexer_test.d;

void main()
{
    import dmd.globals;
    import dmd.lexer;
    import dmd.tokens;

    immutable expected = [
        TOK.void_,
        TOK.identifier,
        TOK.leftParenthesis,
        TOK.rightParenthesis,
        TOK.leftCurly,
        TOK.rightCurly
    ];

    immutable sourceCode = "void test() {} // foobar";
    scope lexer = new Lexer("test", sourceCode.ptr, 0, sourceCode.length, 0, 0);
    lexer.nextToken;

    TOK[] result;

    do
    {
        result ~= lexer.token.value;
    } while (lexer.nextToken != TOK.endOfFile);

    assert(result == expected);
}
```

And then just ``$ dub run``.