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Diffstat (limited to 'lexers/LexX12.cxx')
| -rw-r--r-- | lexers/LexX12.cxx | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/lexers/LexX12.cxx b/lexers/LexX12.cxx new file mode 100644 index 000000000..270cc495d --- /dev/null +++ b/lexers/LexX12.cxx @@ -0,0 +1,341 @@ +// Scintilla Lexer for X12 +// Written by Iain Clarke, IMCSoft & Inobiz AB. +// X12 official documentation is behind a paywall, but there's a description of the syntax here: +// http://www.rawlinsecconsulting.com/x12tutorial/x12syn.html +// This code is subject to the same license terms as the rest of the scintilla project: +// The License.txt file describes the conditions under which this software may be distributed. +// + +// Header order must match order in scripts/HeaderOrder.txt +#include <cstdlib> +#include <cassert> +#include <cstring> +#include <cctype> + +#include <vector> +#include <algorithm> + +#include "ILexer.h" +#include "Scintilla.h" +#include "SciLexer.h" +#include "LexerModule.h" +#include "DefaultLexer.h" + +using namespace Scintilla; + +class LexerX12 : public DefaultLexer +{ +public: + LexerX12(); + virtual ~LexerX12() {} // virtual destructor, as we inherit from ILexer + + static ILexer4 *Factory() { + return new LexerX12; + } + + int SCI_METHOD Version() const override + { + return lvRelease4; + } + void SCI_METHOD Release() override + { + delete this; + } + + const char * SCI_METHOD PropertyNames() override + { + return "fold"; + } + int SCI_METHOD PropertyType(const char *) override + { + return SC_TYPE_BOOLEAN; // Only one property! + } + const char * SCI_METHOD DescribeProperty(const char *name) override + { + if (!strcmp(name, "fold")) + return "Whether to apply folding to document or not"; + return NULL; + } + + Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override + { + if (!strcmp(key, "fold")) + { + m_bFold = strcmp(val, "0") ? true : false; + return 0; + } + return -1; + } + const char * SCI_METHOD DescribeWordListSets() override + { + return NULL; + } + Sci_Position SCI_METHOD WordListSet(int, const char *) override + { + return -1; + } + void SCI_METHOD Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override; + void SCI_METHOD Fold(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override; + void * SCI_METHOD PrivateCall(int, void *) override + { + return NULL; + } + +protected: + struct Terminator + { + int Style = SCE_X12_BAD; + Sci_PositionU pos = 0; + Sci_PositionU length = 0; + int FoldChange = 0; + }; + Terminator InitialiseFromISA(IDocument *pAccess); + Sci_PositionU FindPreviousSegmentStart(IDocument *pAccess, Sci_Position startPos) const; + Terminator DetectSegmentHeader(IDocument *pAccess, Sci_PositionU pos) const; + Terminator FindNextTerminator(IDocument *pAccess, Sci_PositionU pos, bool bJustSegmentTerminator = false) const; + + bool m_bFold; + char m_chSubElement; + char m_chElement; + char m_chSegment[3]; // might be CRLF +}; + +LexerModule lmX12(SCLEX_X12, LexerX12::Factory, "x12"); + +/////////////////////////////////////////////////////////////////////////////// + + + +/////////////////////////////////////////////////////////////////////////////// + +LexerX12::LexerX12() +{ + m_bFold = false; + m_chSegment[0] = m_chSegment[1] = m_chSegment[2] = m_chElement = m_chSubElement = 0; +} + +void LexerX12::Lex(Sci_PositionU startPos, Sci_Position length, int, IDocument *pAccess) +{ + Sci_PositionU posFinish = startPos + length; + + Terminator T = InitialiseFromISA(pAccess); + + if (T.Style == SCE_X12_BAD) + { + if (T.pos < startPos) + T.pos = startPos; // we may be colouring in batches. + pAccess->StartStyling(startPos); + pAccess->SetStyleFor(T.pos - startPos, SCE_X12_ENVELOPE); + pAccess->SetStyleFor(posFinish - T.pos, SCE_X12_BAD); + return; + } + + // Look backwards for a segment start or a document beginning + Sci_PositionU posCurrent = FindPreviousSegmentStart (pAccess, startPos); + + // Style buffer, so we're not issuing loads of notifications + pAccess->StartStyling(posCurrent); + + while (posCurrent < posFinish) + { + // Look for first element marker, so we can denote segment + T = DetectSegmentHeader(pAccess, posCurrent); + if (T.Style == SCE_X12_BAD) + break; + + pAccess->SetStyleFor(T.pos - posCurrent, T.Style); + pAccess->SetStyleFor(T.length, SCE_X12_SEP_ELEMENT); + posCurrent = T.pos + T.length; + + while (T.Style != SCE_X12_BAD && T.Style != SCE_X12_SEGMENTEND) // Break on bad or segment ending + { + T = FindNextTerminator(pAccess, posCurrent); + if (T.Style == SCE_X12_BAD) + break; + + int Style = T.Style; + if (T.Style == SCE_X12_SEGMENTEND && m_chSegment[0] == '\r') // don't style cr/crlf + Style = SCE_X12_DEFAULT; + + pAccess->SetStyleFor(T.pos - posCurrent, SCE_X12_DEFAULT); + pAccess->SetStyleFor(T.length, Style); + posCurrent = T.pos + T.length; + } + if (T.Style == SCE_X12_BAD) + break; + } + + pAccess->SetStyleFor(posFinish - posCurrent, SCE_X12_BAD); +} + +void LexerX12::Fold(Sci_PositionU startPos, Sci_Position length, int, IDocument *pAccess) +{ + if (!m_bFold) + return; + + // Are we even foldable? + if (m_chSegment[0] != '\r' && m_chSegment[0] != '\n') // check for cr,lf,cr+lf. + return; + + Sci_PositionU posFinish = startPos + length; + + // Look backwards for a segment start or a document beginning + startPos = FindPreviousSegmentStart(pAccess, startPos); + Terminator T; + + Sci_PositionU currLine = pAccess->LineFromPosition(startPos); + int levelCurrentStyle = SC_FOLDLEVELBASE; + if (currLine > 0) + levelCurrentStyle = pAccess->GetLevel(currLine - 1); // bottom 12 bits are level + int indentCurrent = levelCurrentStyle & (SC_FOLDLEVELBASE - 1); + + while (startPos < posFinish) + { + T = DetectSegmentHeader(pAccess, startPos); + int indentNext = indentCurrent + T.FoldChange; + if (indentNext < 0) + indentNext = 0; + + levelCurrentStyle = (T.FoldChange > 0) ? (SC_FOLDLEVELBASE | SC_FOLDLEVELHEADERFLAG) : SC_FOLDLEVELBASE; + + currLine = pAccess->LineFromPosition(startPos); + pAccess->SetLevel(currLine, levelCurrentStyle | indentCurrent); + + T = FindNextTerminator(pAccess, startPos, true); + startPos = T.pos + T.length; + indentCurrent = indentNext; + } +} + +LexerX12::Terminator LexerX12::InitialiseFromISA(IDocument *pAccess) +{ + Sci_Position length = pAccess->Length(); + char c; + if (length <= 106) + return { SCE_X12_BAD, 0 }; + + pAccess->GetCharRange(&m_chElement, 3, 1); + pAccess->GetCharRange(&m_chSubElement, 104, 1); + pAccess->GetCharRange(m_chSegment, 105, 1); + if (m_chSegment[0] == '\r') // are we CRLF? + { + pAccess->GetCharRange(&c, 106, 1); + if (c == '\n') + m_chSegment[1] = c; + } + + // Validate we have an element separator, and it's not silly! + if (m_chElement == '\0' || m_chElement == '\n' || m_chElement == '\r') + return { SCE_X12_BAD, 3 }; + + // Validate we have an element separator, and it's not silly! + if (m_chSubElement == '\0' || m_chSubElement == '\n' || m_chSubElement == '\r') + return { SCE_X12_BAD, 103 }; + + if (m_chElement == m_chSubElement) + return { SCE_X12_BAD, 104 }; + if (m_chElement == m_chSegment[0]) + return { SCE_X12_BAD, 105 }; + if (m_chSubElement == m_chSegment[0]) + return { SCE_X12_BAD, 104 }; + + // Check we have element markers at all the right places! ISA element has fixed entries. + std::vector<Sci_PositionU> ElementMarkers = { 3, 6, 17, 20, 31, 34, 50, 53, 69, 76, 81, 83, 89, 99, 101, 103 }; + for (auto i : ElementMarkers) + { + pAccess->GetCharRange(&c, i, 1); + if (c != m_chElement) + return { SCE_X12_BAD, i }; + } + // Check we have no element markers anywhere else! + for (Sci_PositionU i = 0; i < 105; i++) + { + if (std::find(ElementMarkers.begin(), ElementMarkers.end(), i) != ElementMarkers.end()) + continue; + + pAccess->GetCharRange(&c, i, 1); + if (c == m_chElement) + return { SCE_X12_BAD, i }; + } + + return { SCE_X12_ENVELOPE }; +} + +Sci_PositionU LexerX12::FindPreviousSegmentStart(IDocument *pAccess, Sci_Position startPos) const +{ + char c; + + for ( ; startPos > 0; startPos--) + { + pAccess->GetCharRange(&c, startPos, 1); + if (c != m_chSegment[0]) + continue; + // we've matched one - if this is not crlf we're done. + if (!m_chSegment[1]) + return startPos + 1; + pAccess->GetCharRange(&c, startPos+1, 1); + if (c == m_chSegment[1]) + return startPos + 2; + } + // We didn't find a ', so just go with the beginning + return 0; +} + +LexerX12::Terminator LexerX12::DetectSegmentHeader(IDocument *pAccess, Sci_PositionU pos) const +{ + Sci_PositionU posStart = pos; + Sci_Position Length = pAccess->Length(); + char Buf[6] = { 0 }; + while (pos - posStart < 5 && pos < (Sci_PositionU)Length) + { + pAccess->GetCharRange(Buf + pos - posStart, pos, 1); + if (Buf [pos - posStart] != m_chElement) // more? + { + pos++; + continue; + } + if (strcmp(Buf, "ISA*") == 0) + return { SCE_X12_ENVELOPE, pos, 1, +1 }; + if (strcmp(Buf, "IEA*") == 0) + return { SCE_X12_ENVELOPE, pos, 1, -1 }; + if (strcmp(Buf, "GS*") == 0) + return { SCE_X12_FUNCTIONGROUP, pos, 1, +1 }; + if (strcmp(Buf, "GE*") == 0) + return { SCE_X12_FUNCTIONGROUP, pos, 1, -1 }; + if (strcmp(Buf, "ST*") == 0) + return { SCE_X12_TRANSACTIONSET, pos, 1, +1 }; + if (strcmp(Buf, "SE*") == 0) + return { SCE_X12_TRANSACTIONSET, pos, 1, -1 }; + return { SCE_X12_SEGMENTHEADER, pos, 1, 0 }; + } + return { SCE_X12_BAD, pos, 0, 0 }; +} + +LexerX12::Terminator LexerX12::FindNextTerminator(IDocument *pAccess, Sci_PositionU pos, bool bJustSegmentTerminator) const +{ + char c; + Sci_Position Length = pAccess->Length(); + + while (pos < (Sci_PositionU)Length) + { + pAccess->GetCharRange(&c, pos, 1); + if (!bJustSegmentTerminator && c == m_chElement) + return { SCE_X12_SEP_ELEMENT, pos, 1 }; + else if (!bJustSegmentTerminator && c == m_chSubElement) + return { SCE_X12_SEP_SUBELEMENT, pos, 1 }; + else if (c == m_chSegment[0]) + { + if (!m_chSegment[1]) + return { SCE_X12_SEGMENTEND, pos, 1 }; + pos++; + if (pos >= (Sci_PositionU)Length) + break; + pAccess->GetCharRange(&c, pos, 1); + if (c == m_chSegment[1]) + return { SCE_X12_SEGMENTEND, pos-1, 2 }; + } + pos++; + } + + return { SCE_X12_BAD, pos }; +} |