Support for SourceMaps

[dinusv]

SourcePosition{ column, row, offset }

PositionSection{ SourcePosition position; }

// usage

*compose << "{" << pos(node->startPos()) << slice(node, source) << pos(node->endPos()) << "}";

When calling flatten, instead of using parts.push_back(content), implement a new class: SectionCollector.

el::JSSection* section = new el::JSSection;
section->from = 0;
section->to   = static_cast<int>(contents.size());

LanguageNodesToJs lnt;
lnt.convert(node, contents, section->m_children, 0, ctx);

auto sc = new SectionCollector(SectionCollector::Minified);
section->collect(contents, sc);
sc->getSourceMap();
sc->getSource();

sc->append(content);
sc->appendPosition(position); // here, section collector will know the position

Testing

Add .m.json files for readability:

ParserTest01.lv
ParserTest01.lv.m.json

{
    "file" : "generated_file",
    "sources": ["source_file"],
    "mappings" : [
        { "o": { "line": 1, "column" : 1  }, "g": { "line" : 1, "column" : 12 } }
    ]
}