/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef _MORKPARSER_ #define _MORKPARSER_ 1 #ifndef _MORK_ #include "mork.h" #endif #ifndef _MORKBLOB_ #include "morkBlob.h" #endif #ifndef _MORKSINK_ #include "morkSink.h" #endif #ifndef _MORKYARN_ #include "morkYarn.h" #endif #ifndef _MORKCELL_ #include "morkCell.h" #endif //3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789 /*============================================================================= * morkPlace: stream byte position and stream line count */ class morkPlace { public: mork_pos mPlace_Pos; // byte offset in an input stream mork_line mPlace_Line; // line count in an input stream void ClearPlace() { mPlace_Pos = 0; mPlace_Line = 0; } void SetPlace(mork_pos inPos, mork_line inLine) { mPlace_Pos = inPos; mPlace_Line = inLine; } morkPlace() { mPlace_Pos = 0; mPlace_Line = 0; } morkPlace(mork_pos inPos, mork_line inLine) { mPlace_Pos = inPos; mPlace_Line = inLine; } morkPlace(const morkPlace& inPlace) : mPlace_Pos(inPlace.mPlace_Pos), mPlace_Line(inPlace.mPlace_Line) { } }; /*============================================================================= * morkGlitch: stream place and error comment describing a parsing error */ class morkGlitch { public: morkPlace mGlitch_Place; // place in stream where problem happened const char* mGlitch_Comment; // null-terminated ASCII C string morkGlitch() { mGlitch_Comment = 0; } morkGlitch(const morkPlace& inPlace, const char* inComment) : mGlitch_Place(inPlace), mGlitch_Comment(inComment) { } }; /*============================================================================= * morkMid: all possible ways needed to express an alias ID in Mork syntax */ /*| morkMid: an abstraction of all the variations we might need to support **| in order to present an ID through the parser interface most cheaply and **| with minimum transformation away from the original text format. **| **|| An ID can have one of four forms: **| 1) idHex (mMid_Oid.mOid_Id <- idHex) **| 2) idHex:^scopeHex (mMid_Oid.mOid_Id <- idHex, mOid_Scope <- scopeHex) **| 3) idHex:scopeName (mMid_Oid.mOid_Id <- idHex, mMid_Buf <- scopeName) **| 4) columnName (mMid_Buf <- columnName, for columns in cells only) **| **|| Typically, mMid_Oid.mOid_Id will hold a nonzero integer value for **| an ID, but we might have an optional scope specified by either an integer **| in hex format, or a string name. (Note that while the first ID can be **| scoped variably, any integer ID for a scope is assumed always located in **| the same scope, so the second ID need not be disambiguated.) **| **|| The only time mMid_Oid.mOid_Id is ever zero is when mMid_Buf alone **| is nonzero, to indicate an explicit string instead of an alias appeared. **| This case happens to make the representation of columns in cells somewhat **| easier to represent, since columns can just appear as a string name; and **| this unifies those interfaces with row and table APIs expecting IDs. **| **|| So when the parser passes an instance of morkMid to a subclass, the **| mMid_Oid.mOid_Id slot should usually be nonzero. And the other two **| slots, mMid_Oid.mOid_Scope and mMid_Buf, might both be zero, or at **| most one of them will be nonzero to indicate an explicit scope; the **| parser is responsible for ensuring at most one of these is nonzero. |*/ class morkMid { public: mdbOid mMid_Oid; // mOid_Scope is zero when not specified const morkBuf* mMid_Buf; // points to some specific buf subclass morkMid() { mMid_Oid.mOid_Scope = 0; mMid_Oid.mOid_Id = morkId_kMinusOne; mMid_Buf = 0; } void InitMidWithCoil(morkCoil* ioCoil) { mMid_Oid.mOid_Scope = 0; mMid_Oid.mOid_Id = morkId_kMinusOne; mMid_Buf = ioCoil; } void ClearMid() { mMid_Oid.mOid_Scope = 0; mMid_Oid.mOid_Id = morkId_kMinusOne; mMid_Buf = 0; } morkMid(const morkMid& other) : mMid_Oid(other.mMid_Oid), mMid_Buf(other.mMid_Buf) { } mork_bool HasNoId() const // ID is unspecified? { return ( mMid_Oid.mOid_Id == morkId_kMinusOne ); } mork_bool HasSomeId() const // ID is specified? { return ( mMid_Oid.mOid_Id != morkId_kMinusOne ); } }; /*============================================================================= * morkSpan: start and end stream byte position and stream line count */ class morkSpan { public: morkPlace mSpan_Start; morkPlace mSpan_End; public: // methods public: // inlines morkSpan() { } // use inline empty constructor for each place morkPlace* AsPlace() { return &mSpan_Start; } const morkPlace* AsConstPlace() const { return &mSpan_Start; } void SetSpan(mork_pos inFromPos, mork_line inFromLine, mork_pos inToPos, mork_line inToLine) { mSpan_Start.SetPlace(inFromPos, inFromLine); mSpan_End.SetPlace(inToPos,inToLine); } // setting end, useful to terminate a span using current port span end: void SetEndWithEnd(const morkSpan& inSpan) // end <- span.end { mSpan_End = inSpan.mSpan_End; } // setting start, useful to initiate a span using current port span end: void SetStartWithEnd(const morkSpan& inSpan) // start <- span.end { mSpan_Start = inSpan.mSpan_End; } void ClearSpan() { mSpan_Start.mPlace_Pos = 0; mSpan_Start.mPlace_Line = 0; mSpan_End.mPlace_Pos = 0; mSpan_End.mPlace_Line = 0; } morkSpan(mork_pos inFromPos, mork_line inFromLine, mork_pos inToPos, mork_line inToLine) : mSpan_Start(inFromPos, inFromLine), mSpan_End(inToPos, inToLine) { /* empty implementation */ } }; /*============================================================================= * morkParser: for parsing Mork text syntax */ #define morkParser_kMinGranularity 512 /* parse at least half 0.5K at once */ #define morkParser_kMaxGranularity (64 * 1024) /* parse at most 64 K at once */ #define morkDerived_kParser /*i*/ 0x5073 /* ascii 'Ps' */ #define morkParser_kTag /*i*/ 0x70417253 /* ascii 'pArS' */ // These are states for the simple parsing virtual machine. Needless to say, // these must be distinct, and preferably in a contiguous integer range. // Don't change these constants without looking at switch statements in code. #define morkParser_kCellState 0 /* cell is tightest scope */ #define morkParser_kMetaState 1 /* meta is tightest scope */ #define morkParser_kRowState 2 /* row is tightest scope */ #define morkParser_kTableState 3 /* table is tightest scope */ #define morkParser_kDictState 4 /* dict is tightest scope */ #define morkParser_kPortState 5 /* port is tightest scope */ #define morkParser_kStartState 6 /* parsing has not yet begun */ #define morkParser_kDoneState 7 /* parsing is complete */ #define morkParser_kBrokenState 8 /* parsing is to broken to work */ class morkParser /*d*/ : public morkNode { // public: // slots inherited from morkNode (meant to inform only) // nsIMdbHeap* mNode_Heap; // mork_base mNode_Base; // must equal morkBase_kNode // mork_derived mNode_Derived; // depends on specific node subclass // mork_access mNode_Access; // kOpen, kClosing, kShut, or kDead // mork_usage mNode_Usage; // kHeap, kStack, kMember, kGlobal, kNone // mork_able mNode_Mutable; // can this node be modified? // mork_load mNode_Load; // is this node clean or dirty? // mork_uses mNode_Uses; // refcount for strong refs // mork_refs mNode_Refs; // refcount for strong refs + weak refs // ````` ````` ````` ````` ````` ````` ````` ````` protected: // protected morkParser members nsIMdbHeap* mParser_Heap; // refcounted heap used for allocation morkStream* mParser_Stream; // refcounted input stream mork_u4 mParser_Tag; // must equal morkParser_kTag mork_count mParser_MoreGranularity; // constructor inBytesPerParseSegment mork_u4 mParser_State; // state where parser should resume // after finding ends of group transactions, we can re-seek the start: mork_pos mParser_GroupContentStartPos; // start of this group morkMid mParser_TableMid; // table mid if inside a table morkMid mParser_RowMid; // row mid if inside a row morkMid mParser_CellMid; // cell mid if inside a row mork_gid mParser_GroupId; // group ID if inside a group mork_bool mParser_InPort; // called OnNewPort but not OnPortEnd? mork_bool mParser_InDict; // called OnNewDict but not OnDictEnd? mork_bool mParser_InCell; // called OnNewCell but not OnCellEnd? mork_bool mParser_InMeta; // called OnNewMeta but not OnMetaEnd? mork_bool mParser_InPortRow; // called OnNewPortRow but not OnPortRowEnd? mork_bool mParser_InRow; // called OnNewRow but not OnNewRowEnd? mork_bool mParser_InTable; // called OnNewMeta but not OnMetaEnd? mork_bool mParser_InGroup; // called OnNewGroup but not OnGroupEnd? mork_change mParser_AtomChange; // driven by mParser_Change mork_change mParser_CellChange; // driven by mParser_Change mork_change mParser_RowChange; // driven by mParser_Change mork_change mParser_TableChange; // driven by mParser_Change mork_change mParser_Change; // driven by modifier in text mork_bool mParser_IsBroken; // has the parse become broken? mork_bool mParser_IsDone; // has the parse finished? mork_bool mParser_DoMore; // mParser_MoreGranularity not exhausted? morkMid mParser_Mid; // current alias being parsed // note that mParser_Mid.mMid_Buf points at mParser_ScopeCoil below: // blob coils allocated in mParser_Heap morkCoil mParser_ScopeCoil; // place to accumulate ID scope blobs morkCoil mParser_ValueCoil; // place to accumulate value blobs morkCoil mParser_ColumnCoil; // place to accumulate column blobs morkCoil mParser_StringCoil; // place to accumulate string blobs morkSpool mParser_ScopeSpool; // writes to mParser_ScopeCoil morkSpool mParser_ValueSpool; // writes to mParser_ValueCoil morkSpool mParser_ColumnSpool; // writes to mParser_ColumnCoil morkSpool mParser_StringSpool; // writes to mParser_StringCoil // yarns allocated in mParser_Heap morkYarn mParser_MidYarn; // place to receive from MidToYarn() // span showing current ongoing file position status: morkSpan mParser_PortSpan; // span of current db port file // various spans denoting nested subspaces inside the file's port span: morkSpan mParser_GroupSpan; // span of current transaction group morkSpan mParser_DictSpan; morkSpan mParser_AliasSpan; morkSpan mParser_MetaSpan; morkSpan mParser_TableSpan; morkSpan mParser_RowSpan; morkSpan mParser_CellSpan; morkSpan mParser_ColumnSpan; morkSpan mParser_SlotSpan; private: // convenience inlines mork_pos HerePos() const { return mParser_PortSpan.mSpan_End.mPlace_Pos; } void SetHerePos(mork_pos inPos) { mParser_PortSpan.mSpan_End.mPlace_Pos = inPos; } void CountLineBreak() { ++mParser_PortSpan.mSpan_End.mPlace_Line; } // { ===== begin morkNode interface ===== public: // morkNode virtual methods virtual void CloseMorkNode(morkEnv* ev) override; // CloseParser() only if open virtual ~morkParser(); // assert that CloseParser() executed earlier public: // morkYarn construction & destruction morkParser(morkEnv* ev, const morkUsage& inUsage, nsIMdbHeap* ioHeap, morkStream* ioStream, // the readonly stream for input bytes mdb_count inBytesPerParseSegment, // target for ParseMore() nsIMdbHeap* ioSlotHeap); void CloseParser(morkEnv* ev); // called by CloseMorkNode(); private: // copying is not allowed morkParser(const morkParser& other); morkParser& operator=(const morkParser& other); public: // dynamic type identification mork_bool IsParser() const { return IsNode() && mNode_Derived == morkDerived_kParser; } // } ===== end morkNode methods ===== public: // errors and warnings static void UnexpectedEofError(morkEnv* ev); static void EofInsteadOfHexError(morkEnv* ev); static void ExpectedEqualError(morkEnv* ev); static void ExpectedHexDigitError(morkEnv* ev, int c); static void NonParserTypeError(morkEnv* ev); static void UnexpectedByteInMetaWarning(morkEnv* ev); public: // other type methods mork_bool GoodParserTag() const { return mParser_Tag == morkParser_kTag; } void NonGoodParserError(morkEnv* ev); void NonUsableParserError(morkEnv* ev); // call when IsNode() or GoodParserTag() is false // ````` ````` ````` ````` ````` ````` ````` ````` public: // in virtual morkParser methods, data flow subclass to parser virtual void MidToYarn(morkEnv* ev, const morkMid& inMid, // typically an alias to concat with strings mdbYarn* outYarn) = 0; // The parser might ask that some aliases be turned into yarns, so they // can be concatenated into longer blobs under some circumstances. This // is an alternative to using a long and complex callback for many parts // for a single cell value. // ````` ````` ````` ````` ````` ````` ````` ````` public: // out virtual morkParser methods, data flow parser to subclass // The virtual methods below will be called in a pattern corresponding // to the following grammar isomorphic to the Mork grammar. There should // be no exceptions, so subclasses can rely on seeing an appropriate "end" // method whenever some "new" method has been seen earlier. In the event // that some error occurs that causes content to be flushed, or sudden early // termination of a larger containing entity, we will always call a more // enclosed "end" method before we call an "end" method with greater scope. // Note the "mp" prefix stands for "Mork Parser": // mp:Start ::= OnNewPort mp:PortItem* OnPortEnd // mp:PortItem ::= mp:Content | mp:Group | OnPortGlitch // mp:Group ::= OnNewGroup mp:GroupItem* mp:GroupEnd // mp:GroupItem ::= mp:Content | OnGroupGlitch // mp:GroupEnd ::= OnGroupCommitEnd | OnGroupAbortEnd // mp:Content ::= mp:PortRow | mp:Dict | mp:Table | mp:Row // mp:PortRow ::= OnNewPortRow mp:RowItem* OnPortRowEnd // mp:Dict ::= OnNewDict mp:DictItem* OnDictEnd // mp:DictItem ::= OnAlias | OnAliasGlitch | mp:Meta | OnDictGlitch // mp:Table ::= OnNewTable mp:TableItem* OnTableEnd // mp:TableItem ::= mp:Row | mp:MetaTable | OnTableGlitch // mp:MetaTable ::= OnNewMeta mp:MetaItem* mp:Row OnMetaEnd // mp:Meta ::= OnNewMeta mp:MetaItem* OnMetaEnd // mp:MetaItem ::= mp:Cell | OnMetaGlitch // mp:Row ::= OnMinusRow? OnNewRow mp:RowItem* OnRowEnd // mp:RowItem ::= mp:Cell | mp:Meta | OnRowGlitch // mp:Cell ::= OnMinusCell? OnNewCell mp:CellItem? OnCellEnd // mp:CellItem ::= mp:Slot | OnCellForm | OnCellGlitch // mp:Slot ::= OnValue | OnValueMid | OnRowMid | OnTableMid // Note that in interfaces below, mork_change parameters kAdd and kNil // both mean about the same thing by default. Only kCut is interesting, // because this usually means to remove members instead of adding them. virtual void OnNewPort(morkEnv* ev, const morkPlace& inPlace) = 0; virtual void OnPortGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnPortEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnNewGroup(morkEnv* ev, const morkPlace& inPlace, mork_gid inGid) = 0; virtual void OnGroupGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnGroupCommitEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnGroupAbortEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnNewPortRow(morkEnv* ev, const morkPlace& inPlace, const morkMid& inMid, mork_change inChange) = 0; virtual void OnPortRowGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnPortRowEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnNewTable(morkEnv* ev, const morkPlace& inPlace, const morkMid& inMid, mork_bool inCutAllRows) = 0; virtual void OnTableGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnTableEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnNewMeta(morkEnv* ev, const morkPlace& inPlace) = 0; virtual void OnMetaGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnMetaEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnMinusRow(morkEnv* ev) = 0; virtual void OnNewRow(morkEnv* ev, const morkPlace& inPlace, const morkMid& inMid, mork_bool inCutAllCols) = 0; virtual void OnRowPos(morkEnv* ev, mork_pos inRowPos) = 0; virtual void OnRowGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnRowEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnNewDict(morkEnv* ev, const morkPlace& inPlace) = 0; virtual void OnDictGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnDictEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnAlias(morkEnv* ev, const morkSpan& inSpan, const morkMid& inMid) = 0; virtual void OnAliasGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnMinusCell(morkEnv* ev) = 0; virtual void OnNewCell(morkEnv* ev, const morkPlace& inPlace, const morkMid* inMid, const morkBuf* inBuf) = 0; // Exactly one of inMid and inBuf is nil, and the other is non-nil. // When hex ID syntax is used for a column, then inMid is not nil, and // when a naked string names a column, then inBuf is not nil. virtual void OnCellGlitch(morkEnv* ev, const morkGlitch& inGlitch) = 0; virtual void OnCellForm(morkEnv* ev, mork_cscode inCharsetFormat) = 0; virtual void OnCellEnd(morkEnv* ev, const morkSpan& inSpan) = 0; virtual void OnValue(morkEnv* ev, const morkSpan& inSpan, const morkBuf& inBuf) = 0; virtual void OnValueMid(morkEnv* ev, const morkSpan& inSpan, const morkMid& inMid) = 0; virtual void OnRowMid(morkEnv* ev, const morkSpan& inSpan, const morkMid& inMid) = 0; virtual void OnTableMid(morkEnv* ev, const morkSpan& inSpan, const morkMid& inMid) = 0; // ````` ````` ````` ````` ````` ````` ````` ````` protected: // protected parser helper methods void ParseChunk(morkEnv* ev); // find parse continuation and resume void StartParse(morkEnv* ev); // prepare for parsing void StopParse(morkEnv* ev); // terminate parsing & call needed methods int NextChar(morkEnv* ev); // next non-white content void OnCellState(morkEnv* ev); void OnMetaState(morkEnv* ev); void OnRowState(morkEnv* ev); void OnTableState(morkEnv* ev); void OnDictState(morkEnv* ev); void OnPortState(morkEnv* ev); void OnStartState(morkEnv* ev); void ReadCell(morkEnv* ev); void ReadRow(morkEnv* ev, int c); void ReadRowPos(morkEnv* ev); void ReadTable(morkEnv* ev); void ReadTableMeta(morkEnv* ev); void ReadDict(morkEnv* ev); mork_bool ReadContent(morkEnv* ev, mork_bool inInsideGroup); void ReadGroup(morkEnv* ev); mork_bool ReadEndGroupId(morkEnv* ev); mork_bool ReadAt(morkEnv* ev, mork_bool inInsideGroup); mork_bool FindGroupEnd(morkEnv* ev); void ReadMeta(morkEnv* ev, int inEndMeta); void ReadAlias(morkEnv* ev); mork_id ReadHex(morkEnv* ev, int* outNextChar); morkBuf* ReadValue(morkEnv* ev); morkBuf* ReadName(morkEnv* ev, int c); mork_bool ReadMid(morkEnv* ev, morkMid* outMid); void ReadDictForm(morkEnv *ev); void ReadCellForm(morkEnv *ev, int c); mork_bool MatchPattern(morkEnv* ev, const char* inPattern); void EndSpanOnThisByte(morkEnv* ev, morkSpan* ioSpan); void EndSpanOnLastByte(morkEnv* ev, morkSpan* ioSpan); void StartSpanOnLastByte(morkEnv* ev, morkSpan* ioSpan); void StartSpanOnThisByte(morkEnv* ev, morkSpan* ioSpan); // void EndSpanOnThisByte(morkEnv* ev, morkSpan* ioSpan) // { MORK_USED_2(ev,ioSpan); } // void EndSpanOnLastByte(morkEnv* ev, morkSpan* ioSpan) // { MORK_USED_2(ev,ioSpan); } // void StartSpanOnLastByte(morkEnv* ev, morkSpan* ioSpan) // { MORK_USED_2(ev,ioSpan); } // void StartSpanOnThisByte(morkEnv* ev, morkSpan* ioSpan) // { MORK_USED_2(ev,ioSpan); } int eat_line_break(morkEnv* ev, int inLast); int eat_line_continue(morkEnv* ev); // last char was '\\' int eat_comment(morkEnv* ev); // last char was '/' // ````` ````` ````` ````` ````` ````` ````` ````` public: // public non-poly morkParser methods mdb_count ParseMore( // return count of bytes consumed now morkEnv* ev, // context mork_pos* outPos, // current byte pos in the stream afterwards mork_bool* outDone, // is parsing finished? mork_bool* outBroken // is parsing irreparably dead and broken? ); public: // typesafe refcounting inlines calling inherited morkNode methods static void SlotWeakParser(morkParser* me, morkEnv* ev, morkParser** ioSlot) { morkNode::SlotWeakNode((morkNode*) me, ev, (morkNode**) ioSlot); } static void SlotStrongParser(morkParser* me, morkEnv* ev, morkParser** ioSlot) { morkNode::SlotStrongNode((morkNode*) me, ev, (morkNode**) ioSlot); } }; //3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789 #endif /* _MORKPARSER_ */