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**
** Copyright (C) 2019 The Qt Company Ltd.
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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/*
  jscodemarker.cpp
*/

#include "jscodemarker.h"

#include "atom.h"
#include "generator.h"
#include "node.h"
#include "qmlmarkupvisitor.h"
#include "text.h"
#include "tree.h"

#ifndef QT_NO_DECLARATIVE
#include <private/qqmljsast_p.h>
#include <private/qqmljsengine_p.h>
#include <private/qqmljslexer_p.h>
#include <private/qqmljsparser_p.h>
#endif

QT_BEGIN_NAMESPACE

JsCodeMarker::JsCodeMarker()
{
}

JsCodeMarker::~JsCodeMarker()
{
}

/*!
  Returns \c true if the \a code is recognized by the parser.
 */
bool JsCodeMarker::recognizeCode(const QString &code)
{
#ifndef QT_NO_DECLARATIVE
    QQmlJS::Engine engine;
    QQmlJS::Lexer lexer(&engine);
    QQmlJS::Parser parser(&engine);

    QString newCode = code;
    QVector<QQmlJS::AST::SourceLocation> pragmas = extractPragmas(newCode);
    lexer.setCode(newCode, 1);

    return parser.parseProgram();
#else
    return false;
#endif
}

/*!
  Returns \c true if \a ext is any of a list of file extensions
  for the QML language.
 */
bool JsCodeMarker::recognizeExtension(const QString &ext)
{
    return ext == "js" || ext == "json";
}

/*!
  Returns \c true if the \a language is recognized. We recognize JavaScript,
  ECMAScript and JSON.
 */
bool JsCodeMarker::recognizeLanguage(const QString &language)
{
    return language == "JavaScript" || language == "ECMAScript" || language == "JSON";
}

/*!
  Returns the type of atom used to represent JavaScript code in the documentation.
*/
Atom::AtomType JsCodeMarker::atomType() const
{
    return Atom::JavaScript;
}

QString JsCodeMarker::markedUpCode(const QString &code,
                                   const Node *relative,
                                   const Location &location)
{
    return addMarkUp(code, relative, location);
}

QString JsCodeMarker::addMarkUp(const QString &code,
                                const Node * /* relative */,
                                const Location &location)
{
#ifndef QT_NO_DECLARATIVE
    QQmlJS::Engine engine;
    QQmlJS::Lexer lexer(&engine);

    QString newCode = code;
    QVector<QQmlJS::AST::SourceLocation> pragmas = extractPragmas(newCode);
    lexer.setCode(newCode, 1);

    QQmlJS::Parser parser(&engine);
    QString output;

    if (parser.parseProgram()) {
        QQmlJS::AST::Node *ast = parser.rootNode();
        // Pass the unmodified code to the visitor so that pragmas and other
        // unhandled source text can be output.
        QmlMarkupVisitor visitor(code, pragmas, &engine);
        QQmlJS::AST::Node::accept(ast, &visitor);
        if (visitor.hasError()) {
            location.warning(location.fileName() +
                             tr("Unable to analyze JavaScript. The output is incomplete."));
        }
        output = visitor.markedUpCode();
    } else {
        location.warning(location.fileName() +
                         tr("Unable to parse JavaScript: \"%1\" at line %2, column %3").arg(
                             parser.errorMessage()).arg(parser.errorLineNumber()).arg(
                             parser.errorColumnNumber()));
        output = protect(code);
    }
    return output;
#else
    location.warning("QtDeclarative not installed; cannot parse QML or JS.");
    return QString();
#endif
}

QT_END_NAMESPACE