62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
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#ifndef INTERPRETER_H
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#define INTERPRETER_H
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#include "ast.h"
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#include <QDataStream>
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#include <QVariantMap>
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#include <QIODevice>
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struct Runtime {
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QDataStream* in = nullptr;
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Module* module = nullptr; // Non-const to allow modifying globals
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ByteOrder order = ByteOrder::LE;
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QVariantMap vars;
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QString filePath;
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};
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class Interpreter {
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public:
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explicit Interpreter(Module mod);
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// Parse a given type name from a device/stream
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QVariantMap runType(const QString& typeName, QIODevice* dev, const QString& filePath = QString()) const;
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// Run from existing QDataStream (for nested parse)
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QVariantMap runType(const QString& typeName, QDataStream& stream, const QString &filePath = QString()) const;
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// Check if the criteria for a certain filetype matches
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bool checkCriteria(const QString& typeName, QIODevice* dev, const QString filePath) const;
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QVariantMap runTypeInternal(const QString& typeName,
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QDataStream& stream,
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const QString& filePath,
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std::optional<ByteOrder> inheritedOrder) const;
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static void seedFileVars(Runtime &rt, const QString &filePath);
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private:
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QVariant evalExpr(Runtime& rt, const Expr& e) const;
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QVariant evalCall(Runtime& rt, const Expr::Call& c) const;
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QVariant evalPipe(Runtime& rt, const Expr::Pipe& p) const;
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void execStmt(Runtime& rt, const Stmt& s) const;
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void execBlock(Runtime& rt, const QVector<StmtPtr>& body) const;
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// helpers
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void applyByteOrder(Runtime& rt) const;
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QVariant readScalar(Runtime& rt, ScalarType t) const;
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QByteArray readBytes(Runtime& rt, qint64 n) const;
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QByteArray readEOF(Runtime& rt) const;
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qint64 toInt(const QVariant& v) const;
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bool toBool(const QVariant& v) const;
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private:
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mutable Module m_mod; // Mutable to allow modifying globals from const methods
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};
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#endif // INTERPRETER_H
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