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#include "qmlrewrite_p.h"

QT_BEGIN_NAMESPACE

namespace QmlRewrite {

QString RewriteBinding::operator()(const QString &code)
{
    Engine engine;
    NodePool pool(QString(), &engine);
    Lexer lexer(&engine);
    Parser parser(&engine);
    lexer.setCode(code, 0);
    parser.parseStatement();
    return rewrite(code, 0, parser.statement());
}

void RewriteBinding::accept(AST::Node *node)
{
    AST::Node::acceptChild(node, this);
}

QString RewriteBinding::rewrite(QString code, unsigned position,
                                AST::Statement *node)
{
    TextWriter w;
    _writer = &w;
    _position = position;

    accept(node);

    unsigned startOfStatement = node->firstSourceLocation().begin() - _position;
    unsigned endOfStatement = node->lastSourceLocation().end() - _position;

    _writer->replace(startOfStatement, 0, QLatin1String("(function() { "));
    _writer->replace(endOfStatement, 0, QLatin1String(" })"));

    w.write(&code);

    return code;
}

bool RewriteBinding::visit(AST::Block *ast)
{
    for (AST::StatementList *it = ast->statements; it; it = it->next) {
        if (! it->next) {
            // we need to rewrite only the last statement of a block.
            accept(it->statement);
        }
    }

    return false;
}

bool RewriteBinding::visit(AST::ExpressionStatement *ast)
{
    unsigned startOfExpressionStatement = ast->firstSourceLocation().begin() - _position;
    _writer->replace(startOfExpressionStatement, 0, QLatin1String("return "));

    return false;
}

} // namespace QmlRewrite

QT_END_NAMESPACE