| /// \file |
| /// Base functions to initialize and manipulate any input stream |
| /// |
| |
| // [The "BSD licence"] |
| // Copyright (c) 2005-2009 Jim Idle, Temporal Wave LLC |
| // http://www.temporal-wave.com |
| // http://www.linkedin.com/in/jimidle |
| // |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // 1. Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // 2. Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // 3. The name of the author may not be used to endorse or promote products |
| // derived from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include <antlr3input.h> |
| |
| // ----------------------------------- |
| // Generic 8 bit input such as latin-1 |
| // |
| |
| // 8Bit INT Stream API |
| // |
| static void antlr38BitConsume (pANTLR3_INT_STREAM is); |
| static ANTLR3_UCHAR antlr38BitLA (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static ANTLR3_UCHAR antlr38BitLA_ucase (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static ANTLR3_MARKER antlr38BitIndex (pANTLR3_INT_STREAM is); |
| static ANTLR3_MARKER antlr38BitMark (pANTLR3_INT_STREAM is); |
| static void antlr38BitRewind (pANTLR3_INT_STREAM is, ANTLR3_MARKER mark); |
| static void antlr38BitRewindLast (pANTLR3_INT_STREAM is); |
| static void antlr38BitRelease (pANTLR3_INT_STREAM is, ANTLR3_MARKER mark); |
| static void antlr38BitSeek (pANTLR3_INT_STREAM is, ANTLR3_MARKER seekPoint); |
| static pANTLR3_STRING antlr38BitGetSourceName (pANTLR3_INT_STREAM is); |
| |
| // 8Bit Charstream API functions |
| // |
| static void antlr3InputClose (pANTLR3_INPUT_STREAM input); |
| static void antlr3InputReset (pANTLR3_INPUT_STREAM input); |
| static void antlr38BitReuse (pANTLR3_INPUT_STREAM input, pANTLR3_UINT8 inString, ANTLR3_UINT32 size, pANTLR3_UINT8 name); |
| static void * antlr38BitLT (pANTLR3_INPUT_STREAM input, ANTLR3_INT32 lt); |
| static ANTLR3_UINT32 antlr38BitSize (pANTLR3_INPUT_STREAM input); |
| static pANTLR3_STRING antlr38BitSubstr (pANTLR3_INPUT_STREAM input, ANTLR3_MARKER start, ANTLR3_MARKER stop); |
| static ANTLR3_UINT32 antlr38BitGetLine (pANTLR3_INPUT_STREAM input); |
| static void * antlr38BitGetLineBuf (pANTLR3_INPUT_STREAM input); |
| static ANTLR3_UINT32 antlr38BitGetCharPosition (pANTLR3_INPUT_STREAM input); |
| static void antlr38BitSetLine (pANTLR3_INPUT_STREAM input, ANTLR3_UINT32 line); |
| static void antlr38BitSetCharPosition (pANTLR3_INPUT_STREAM input, ANTLR3_UINT32 position); |
| static void antlr38BitSetNewLineChar (pANTLR3_INPUT_STREAM input, ANTLR3_UINT32 newlineChar); |
| static void antlr38BitSetUcaseLA (pANTLR3_INPUT_STREAM input, ANTLR3_BOOLEAN flag); |
| |
| // ----------------------------------- |
| // UTF16 (also covers UCS2) |
| // |
| // INT Stream API |
| // |
| static void antlr3UTF16Consume (pANTLR3_INT_STREAM is); |
| static ANTLR3_UCHAR antlr3UTF16LA (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static void antlr3UTF16ConsumeLE (pANTLR3_INT_STREAM is); |
| static ANTLR3_UCHAR antlr3UTF16LALE (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static void antlr3UTF16ConsumeBE (pANTLR3_INT_STREAM is); |
| static ANTLR3_UCHAR antlr3UTF16LABE (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static ANTLR3_MARKER antlr3UTF16Index (pANTLR3_INT_STREAM is); |
| static void antlr3UTF16Seek (pANTLR3_INT_STREAM is, ANTLR3_MARKER seekPoint); |
| |
| // UTF16 Charstream API functions |
| // |
| static pANTLR3_STRING antlr3UTF16Substr (pANTLR3_INPUT_STREAM input, ANTLR3_MARKER start, ANTLR3_MARKER stop); |
| |
| // ----------------------------------- |
| // UTF32 (also covers UCS2) |
| // |
| // INT Stream API |
| // |
| static void antlr3UTF32Consume (pANTLR3_INT_STREAM is); |
| static ANTLR3_UCHAR antlr3UTF32LA (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static ANTLR3_UCHAR antlr3UTF32LALE (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static ANTLR3_UCHAR antlr3UTF32LABE (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| static ANTLR3_MARKER antlr3UTF32Index (pANTLR3_INT_STREAM is); |
| static void antlr3UTF32Seek (pANTLR3_INT_STREAM is, ANTLR3_MARKER seekPoint); |
| |
| // UTF16 Charstream API functions |
| // |
| static pANTLR3_STRING antlr3UTF32Substr (pANTLR3_INPUT_STREAM input, ANTLR3_MARKER start, ANTLR3_MARKER stop); |
| |
| // ------------------------------------ |
| // UTF-8 |
| // |
| static void antlr3UTF8Consume (pANTLR3_INT_STREAM is); |
| static ANTLR3_UCHAR antlr3UTF8LA (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| |
| // ------------------------------------ |
| // EBCDIC |
| // |
| static ANTLR3_UCHAR antlr3EBCDICLA (pANTLR3_INT_STREAM is, ANTLR3_INT32 la); |
| |
| /// \brief Common function to setup function interface for an 8 bit input stream. |
| /// |
| /// \param input Input stream context pointer |
| /// |
| /// \remark |
| /// - Many of the 8 bit oriented file stream handling functions will be usable |
| /// by any or at least some, other input streams. Therefore it is perfectly acceptable |
| /// to call this function to install the 8Bit handler then override just those functions |
| /// that would not work for the particular input encoding, such as consume for instance. |
| /// |
| void |
| antlr38BitSetupStream (pANTLR3_INPUT_STREAM input) |
| { |
| // Build a string factory for this stream |
| // |
| input->strFactory = antlr3StringFactoryNew(input->encoding); |
| |
| // Default stream API set up is for 8Bit, so we are done |
| // |
| } |
| |
| void |
| antlr3GenericSetupStream (pANTLR3_INPUT_STREAM input) |
| { |
| /* Install function pointers for an 8 bit input |
| */ |
| |
| /* Allocate stream interface |
| */ |
| input->istream = antlr3IntStreamNew(); |
| input->istream->type = ANTLR3_CHARSTREAM; |
| input->istream->super = input; |
| |
| /* Intstream API |
| */ |
| input->istream->consume = antlr38BitConsume; // Consume the next 8 bit character in the buffer |
| input->istream->_LA = antlr38BitLA; // Return the UTF32 character at offset n (1 based) |
| input->istream->index = antlr38BitIndex; // Current index (offset from first character |
| input->istream->mark = antlr38BitMark; // Record the current lex state for later restore |
| input->istream->rewind = antlr38BitRewind; // How to rewind the input |
| input->istream->rewindLast = antlr38BitRewindLast; // How to rewind the input |
| input->istream->seek = antlr38BitSeek; // How to seek to a specific point in the stream |
| input->istream->release = antlr38BitRelease; // Reset marks after mark n |
| input->istream->getSourceName = antlr38BitGetSourceName; // Return a string that names the input source |
| |
| /* Charstream API |
| */ |
| input->close = antlr3InputClose; // Close down the stream completely |
| input->free = antlr3InputClose; // Synonym for free |
| input->reset = antlr3InputReset; // Reset input to start |
| input->reuse = antlr38BitReuse; // Install a new input string and reset |
| input->_LT = antlr38BitLT; // Same as _LA for 8 bit file |
| input->size = antlr38BitSize; // Return the size of the input buffer |
| input->substr = antlr38BitSubstr; // Return a string from the input stream |
| input->getLine = antlr38BitGetLine; // Return the current line number in the input stream |
| input->getLineBuf = antlr38BitGetLineBuf; // Return a pointer to the start of the current line being consumed |
| input->getCharPositionInLine = antlr38BitGetCharPosition; // Return the offset into the current line of input |
| input->setLine = antlr38BitSetLine; // Set the input stream line number (does not set buffer pointers) |
| input->setCharPositionInLine = antlr38BitSetCharPosition; // Set the offset in to the current line (does not set any pointers) |
| input->SetNewLineChar = antlr38BitSetNewLineChar; // Set the value of the newline trigger character |
| input->setUcaseLA = antlr38BitSetUcaseLA; // Changes the LA function to return upper case always |
| |
| input->charByteSize = 1; // Size in bytes of characters in this stream. |
| |
| /* Initialize entries for tables etc |
| */ |
| input->markers = NULL; |
| |
| /* Set up the input stream brand new |
| */ |
| input->reset(input); |
| |
| /* Install default line separator character (it can be replaced |
| * by the grammar programmer later) |
| */ |
| input->SetNewLineChar(input, (ANTLR3_UCHAR)'\n'); |
| } |
| |
| static pANTLR3_STRING |
| antlr38BitGetSourceName(pANTLR3_INT_STREAM is) |
| { |
| return is->streamName; |
| } |
| |
| /** \brief Close down an input stream and free any memory allocated by it. |
| * |
| * \param input Input stream context pointer |
| */ |
| static void |
| antlr3InputClose(pANTLR3_INPUT_STREAM input) |
| { |
| // Close any markers in the input stream |
| // |
| if (input->markers != NULL) |
| { |
| input->markers->free(input->markers); |
| input->markers = NULL; |
| } |
| |
| // Close the string factory |
| // |
| if (input->strFactory != NULL) |
| { |
| input->strFactory->close(input->strFactory); |
| } |
| |
| // Free the input stream buffer if we allocated it |
| // |
| if (input->isAllocated && input->data != NULL) |
| { |
| ANTLR3_FREE(input->data); |
| input->data = NULL; |
| } |
| |
| input->istream->free(input->istream); |
| |
| // Finally, free the space for the structure itself |
| // |
| ANTLR3_FREE(input); |
| |
| // Done |
| // |
| } |
| |
| static void |
| antlr38BitSetUcaseLA (pANTLR3_INPUT_STREAM input, ANTLR3_BOOLEAN flag) |
| { |
| if (flag) |
| { |
| // Return the upper case version of the characters |
| // |
| input->istream->_LA = antlr38BitLA_ucase; |
| } |
| else |
| { |
| // Return the raw characters as they are in the buffer |
| // |
| input->istream->_LA = antlr38BitLA; |
| } |
| } |
| |
| |
| /** \brief Reset a re-startable input stream to the start |
| * |
| * \param input Input stream context pointer |
| */ |
| static void |
| antlr3InputReset(pANTLR3_INPUT_STREAM input) |
| { |
| |
| input->nextChar = input->data; /* Input at first character */ |
| input->line = 1; /* starts at line 1 */ |
| input->charPositionInLine = -1; |
| input->currentLine = input->data; |
| input->markDepth = 0; /* Reset markers */ |
| |
| /* Clear out up the markers table if it is there |
| */ |
| if (input->markers != NULL) |
| { |
| input->markers->clear(input->markers); |
| } |
| else |
| { |
| /* Install a new markers table |
| */ |
| input->markers = antlr3VectorNew(0); |
| } |
| } |
| |
| /** Install a new source code in to a working input stream so that the |
| * input stream can be reused. |
| */ |
| static void |
| antlr38BitReuse(pANTLR3_INPUT_STREAM input, pANTLR3_UINT8 inString, ANTLR3_UINT32 size, pANTLR3_UINT8 name) |
| { |
| input->isAllocated = ANTLR3_FALSE; |
| input->data = inString; |
| input->sizeBuf = size; |
| |
| // Now we can set up the file name. As we are reusing the stream, there may already |
| // be a string that we can reuse for holding the filename. |
| // |
| if (input->istream->streamName == NULL) |
| { |
| input->istream->streamName = input->strFactory->newStr(input->strFactory, name == NULL ? (pANTLR3_UINT8)"-memory-" : name); |
| input->fileName = input->istream->streamName; |
| } |
| else |
| { |
| input->istream->streamName->set(input->istream->streamName, (name == NULL ? (const char *)"-memory-" : (const char *)name)); |
| } |
| |
| input->reset(input); |
| } |
| |
| /** \brief Consume the next character in an 8 bit input stream |
| * |
| * \param input Input stream context pointer |
| */ |
| static void |
| antlr38BitConsume(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| /* Indicate one more character in this line |
| */ |
| input->charPositionInLine++; |
| |
| if ((ANTLR3_UCHAR)(*((pANTLR3_UINT8)input->nextChar)) == input->newlineChar) |
| { |
| /* Reset for start of a new line of input |
| */ |
| input->line++; |
| input->charPositionInLine = 0; |
| input->currentLine = (void *)(((pANTLR3_UINT8)input->nextChar) + 1); |
| } |
| |
| /* Increment to next character position |
| */ |
| input->nextChar = (void *)(((pANTLR3_UINT8)input->nextChar) + 1); |
| } |
| } |
| |
| /** \brief Return the input element assuming an 8 bit ascii input |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] la 1 based offset of next input stream element |
| * |
| * \return Next input character in internal ANTLR3 encoding (UTF32) |
| */ |
| static ANTLR3_UCHAR |
| antlr38BitLA(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| if (( ((pANTLR3_UINT8)input->nextChar) + la - 1) >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| return (ANTLR3_UCHAR)(*((pANTLR3_UINT8)input->nextChar + la - 1)); |
| } |
| } |
| |
| /** \brief Return the input element assuming an 8 bit input and |
| * always return the UPPER CASE character. |
| * Note that this is 8 bit and so we assume that the toupper |
| * function will use the correct locale for 8 bits. |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] la 1 based offset of next input stream element |
| * |
| * \return Next input character in internal ANTLR3 encoding (UTF32) |
| */ |
| static ANTLR3_UCHAR |
| antlr38BitLA_ucase (pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| if (( ((pANTLR3_UINT8)input->nextChar) + la - 1) >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| return (ANTLR3_UCHAR)toupper((*((pANTLR3_UINT8)input->nextChar + la - 1))); |
| } |
| } |
| |
| |
| /** \brief Return the input element assuming an 8 bit ascii input |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] lt 1 based offset of next input stream element |
| * |
| * \return Next input character in internal ANTLR3 encoding (UTF32) |
| */ |
| static void * |
| antlr38BitLT(pANTLR3_INPUT_STREAM input, ANTLR3_INT32 lt) |
| { |
| /* Casting is horrible but it means no warnings and LT should never be called |
| * on a character stream anyway I think. If it is then, the void * will need to be |
| * cast back in a similar manner. Yuck! But this means that LT for Token streams and |
| * tree streams is correct. |
| */ |
| return (ANTLR3_FUNC_PTR(input->istream->_LA(input->istream, lt))); |
| } |
| |
| /** \brief Calculate the current index in the output stream. |
| * \param[in] input Input stream context pointer |
| */ |
| static ANTLR3_MARKER |
| antlr38BitIndex(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| return (ANTLR3_MARKER)(((pANTLR3_UINT8)input->nextChar)); |
| } |
| |
| /** \brief Return the size of the current input stream, as an 8Bit file |
| * which in this case is the total input. Other implementations may provide |
| * more sophisticated implementations to deal with non-recoverable streams |
| * and so on. |
| * |
| * \param[in] input Input stream context pointer |
| */ |
| static ANTLR3_UINT32 |
| antlr38BitSize(pANTLR3_INPUT_STREAM input) |
| { |
| return input->sizeBuf; |
| } |
| |
| /** \brief Mark the current input point in an 8Bit 8 bit stream |
| * such as a file stream, where all the input is available in the |
| * buffer. |
| * |
| * \param[in] is Input stream context pointer |
| */ |
| static ANTLR3_MARKER |
| antlr38BitMark (pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_LEX_STATE state; |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| /* New mark point |
| */ |
| input->markDepth++; |
| |
| /* See if we are revisiting a mark as we can just reuse the vector |
| * entry if we are, otherwise, we need a new one |
| */ |
| if (input->markDepth > input->markers->count) |
| { |
| state = ANTLR3_MALLOC(sizeof(ANTLR3_LEX_STATE)); |
| |
| /* Add it to the table |
| */ |
| input->markers->add(input->markers, state, ANTLR3_FREE_FUNC); /* No special structure, just free() on delete */ |
| } |
| else |
| { |
| state = (pANTLR3_LEX_STATE)input->markers->get(input->markers, input->markDepth - 1); |
| |
| /* Assume no errors for speed, it will just blow up if the table failed |
| * for some reasons, hence lots of unit tests on the tables ;-) |
| */ |
| } |
| |
| /* We have created or retrieved the state, so update it with the current |
| * elements of the lexer state. |
| */ |
| state->charPositionInLine = input->charPositionInLine; |
| state->currentLine = input->currentLine; |
| state->line = input->line; |
| state->nextChar = input->nextChar; |
| |
| is->lastMarker = input->markDepth; |
| |
| /* And that's it |
| */ |
| return input->markDepth; |
| } |
| /** \brief Rewind the lexer input to the state specified by the last produced mark. |
| * |
| * \param[in] input Input stream context pointer |
| * |
| * \remark |
| * Assumes 8 Bit input stream. |
| */ |
| static void |
| antlr38BitRewindLast (pANTLR3_INT_STREAM is) |
| { |
| is->rewind(is, is->lastMarker); |
| } |
| |
| /** \brief Rewind the lexer input to the state specified by the supplied mark. |
| * |
| * \param[in] input Input stream context pointer |
| * |
| * \remark |
| * Assumes 8 Bit input stream. |
| */ |
| static void |
| antlr38BitRewind (pANTLR3_INT_STREAM is, ANTLR3_MARKER mark) |
| { |
| pANTLR3_LEX_STATE state; |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) is->super); |
| |
| /* Perform any clean up of the marks |
| */ |
| input->istream->release(input->istream, mark); |
| |
| /* Find the supplied mark state |
| */ |
| state = (pANTLR3_LEX_STATE)input->markers->get(input->markers, (ANTLR3_UINT32)(mark - 1)); |
| |
| /* Seek input pointer to the requested point (note we supply the void *pointer |
| * to whatever is implementing the int stream to seek). |
| */ |
| antlr38BitSeek(is, (ANTLR3_MARKER)(state->nextChar)); |
| |
| /* Reset to the reset of the information in the mark |
| */ |
| input->charPositionInLine = state->charPositionInLine; |
| input->currentLine = state->currentLine; |
| input->line = state->line; |
| input->nextChar = state->nextChar; |
| |
| /* And we are done |
| */ |
| } |
| |
| /** \brief Rewind the lexer input to the state specified by the supplied mark. |
| * |
| * \param[in] input Input stream context pointer |
| * |
| * \remark |
| * Assumes 8 Bit input stream. |
| */ |
| static void |
| antlr38BitRelease (pANTLR3_INT_STREAM is, ANTLR3_MARKER mark) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| /* We don't do much here in fact as we never free any higher marks in |
| * the hashtable as we just resuse any memory allocated for them. |
| */ |
| input->markDepth = (ANTLR3_UINT32)(mark - 1); |
| } |
| |
| /** \brief Rewind the lexer input to the state specified by the supplied mark. |
| * |
| * \param[in] input Input stream context pointer |
| * |
| * \remark |
| * Assumes 8 Bit input stream. |
| */ |
| static void |
| antlr38BitSeek (pANTLR3_INT_STREAM is, ANTLR3_MARKER seekPoint) |
| { |
| ANTLR3_INT32 count; |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ANTLR3_FUNC_PTR(((pANTLR3_INPUT_STREAM) is->super)); |
| |
| /* If the requested seek point is less than the current |
| * input point, then we assume that we are resetting from a mark |
| * and do not need to scan, but can just set to there. |
| */ |
| if (seekPoint <= (ANTLR3_MARKER)(input->nextChar)) |
| { |
| input->nextChar = ((pANTLR3_UINT8) seekPoint); |
| } |
| else |
| { |
| count = (ANTLR3_UINT32)(seekPoint - (ANTLR3_MARKER)(input->nextChar)); |
| |
| while (count--) |
| { |
| is->consume(is); |
| } |
| } |
| } |
| /** Return a substring of the 8 bit input stream in |
| * newly allocated memory. |
| * |
| * \param input Input stream context pointer |
| * \param start Offset in input stream where the string starts |
| * \param stop Offset in the input stream where the string ends. |
| */ |
| static pANTLR3_STRING |
| antlr38BitSubstr (pANTLR3_INPUT_STREAM input, ANTLR3_MARKER start, ANTLR3_MARKER stop) |
| { |
| return input->strFactory->newPtr(input->strFactory, (pANTLR3_UINT8)start, (ANTLR3_UINT32)(stop - start + 1)); |
| } |
| |
| /** \brief Return the line number as understood by the 8 bit input stream. |
| * |
| * \param input Input stream context pointer |
| * \return Line number in input stream that we believe we are working on. |
| */ |
| static ANTLR3_UINT32 |
| antlr38BitGetLine (pANTLR3_INPUT_STREAM input) |
| { |
| return input->line; |
| } |
| |
| /** Return a pointer into the input stream that points at the start |
| * of the current input line as triggered by the end of line character installed |
| * for the stream ('\n' unless told differently). |
| * |
| * \param[in] input |
| */ |
| static void * |
| antlr38BitGetLineBuf (pANTLR3_INPUT_STREAM input) |
| { |
| return input->currentLine; |
| } |
| |
| /** Return the current offset in to the current line in the input stream. |
| * |
| * \param input Input stream context pointer |
| * \return Current line offset |
| */ |
| static ANTLR3_UINT32 |
| antlr38BitGetCharPosition (pANTLR3_INPUT_STREAM input) |
| { |
| return input->charPositionInLine; |
| } |
| |
| /** Set the current line number as understood by the input stream. |
| * |
| * \param input Input stream context pointer |
| * \param line Line number to tell the input stream we are on |
| * |
| * \remark |
| * This function does not change any pointers, it just allows the programmer to set the |
| * line number according to some external criterion, such as finding a lexed directive |
| * like: #nnn "file.c" for instance, such that error reporting and so on in is in sync |
| * with some original source format. |
| */ |
| static void |
| antlr38BitSetLine (pANTLR3_INPUT_STREAM input, ANTLR3_UINT32 line) |
| { |
| input->line = line; |
| } |
| |
| /** Set the current offset in the current line to be a particular setting. |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] position New setting for current offset. |
| * |
| * \remark |
| * This does not set the actual pointers in the input stream, it is purely for reporting |
| * purposes and so on as per antlr38BitSetLine(); |
| */ |
| static void |
| antlr38BitSetCharPosition (pANTLR3_INPUT_STREAM input, ANTLR3_UINT32 position) |
| { |
| input->charPositionInLine = position; |
| } |
| |
| /** Set the newline trigger character in the input stream to the supplied parameter. |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] newlineChar Character to set to be the newline trigger. |
| * |
| * \remark |
| * - The supplied newLineChar is in UTF32 encoding (which means ASCII and latin1 etc |
| * are the same encodings), but the input stream catered to by this function is 8 bit |
| * only, so it is up to the programmer to ensure that the character supplied is valid. |
| */ |
| static void |
| antlr38BitSetNewLineChar (pANTLR3_INPUT_STREAM input, ANTLR3_UINT32 newlineChar) |
| { |
| input->newlineChar = newlineChar; |
| } |
| |
| |
| /// \brief Common function to setup function interface for a UTF16 or UCS2 input stream. |
| /// |
| /// \param input Input stream context pointer |
| /// |
| /// \remark |
| /// - Strictly speaking, there is no such thing as a UCS2 input stream as the term |
| /// tends to confuse the notions of character encoding, unicode and so on. UCS2 is |
| /// essentially UTF16 without any surrogates and so the standard UTF16 |
| /// input stream is able to handle it without any special code. |
| /// |
| void |
| antlr3UTF16SetupStream (pANTLR3_INPUT_STREAM input, ANTLR3_BOOLEAN machineBigEndian, ANTLR3_BOOLEAN inputBigEndian) |
| { |
| // Build a string factory for this stream. This is a UTF16 string factory which is a standard |
| // part of the ANTLR3 string. The string factory is then passed through the whole chain |
| // of lexer->parser->tree->treeparser and so on. |
| // |
| input->strFactory = antlr3StringFactoryNew(input->encoding); |
| |
| // Generic API that does not care about endianess. |
| // |
| input->istream->index = antlr3UTF16Index; // Calculate current index in input stream, UTF16 based |
| input->substr = antlr3UTF16Substr; // Return a string from the input stream |
| input->istream->seek = antlr3UTF16Seek; // How to seek to a specific point in the stream |
| |
| // We must install different UTF16 routines according to whether the input |
| // is the same endianess as the machine we are executing upon or not. If it is not |
| // then we must install methods that can convert the endianess on the fly as they go |
| // |
| |
| switch (machineBigEndian) |
| { |
| case ANTLR3_TRUE: |
| |
| // Machine is Big Endian, if the input is also then install the |
| // methods that do not access input by bytes and reverse them. |
| // Otherwise install endian aware methods. |
| // |
| if (inputBigEndian == ANTLR3_TRUE) |
| { |
| // Input is machine compatible |
| // |
| input->istream->consume = antlr3UTF16Consume; // Consume the next UTF16 character in the buffer |
| input->istream->_LA = antlr3UTF16LA; // Return the UTF32 character at offset n (1 based) |
| } |
| else |
| { |
| // Need to use methods that know that the input is little endian |
| // |
| input->istream->consume = antlr3UTF16ConsumeLE; // Consume the next UTF16 character in the buffer |
| input->istream->_LA = antlr3UTF16LALE; // Return the UTF32 character at offset n (1 based) |
| } |
| break; |
| |
| case ANTLR3_FALSE: |
| |
| // Machine is Little Endian, if the input is also then install the |
| // methods that do not access input by bytes and reverse them. |
| // Otherwise install endian aware methods. |
| // |
| if (inputBigEndian == ANTLR3_FALSE) |
| { |
| // Input is machine compatible |
| // |
| input->istream->consume = antlr3UTF16Consume; // Consume the next UTF16 character in the buffer |
| input->istream->_LA = antlr3UTF16LA; // Return the UTF32 character at offset n (1 based) |
| } |
| else |
| { |
| // Need to use methods that know that the input is Big Endian |
| // |
| input->istream->consume = antlr3UTF16ConsumeBE; // Consume the next UTF16 character in the buffer |
| input->istream->_LA = antlr3UTF16LABE; // Return the UTF32 character at offset n (1 based) |
| } |
| break; |
| } |
| |
| |
| input->charByteSize = 2; // Size in bytes of characters in this stream. |
| |
| } |
| |
| /// \brief Consume the next character in a UTF16 input stream |
| /// |
| /// \param input Input stream context pointer |
| /// |
| static void |
| antlr3UTF16Consume(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| UTF32 ch; |
| UTF32 ch2; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| // Buffer size is always in bytes |
| // |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Indicate one more character in this line |
| // |
| input->charPositionInLine++; |
| |
| if ((ANTLR3_UCHAR)(*((pANTLR3_UINT16)input->nextChar)) == input->newlineChar) |
| { |
| // Reset for start of a new line of input |
| // |
| input->line++; |
| input->charPositionInLine = 0; |
| input->currentLine = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| } |
| |
| // Increment to next character position, accounting for any surrogates |
| // |
| // Next char in natural machine byte order |
| // |
| ch = *((UTF16*)input->nextChar); |
| |
| // We consumed one 16 bit character |
| // |
| input->nextChar = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) { |
| |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Next character is in natural machine byte order |
| // |
| ch2 = *((UTF16*)input->nextChar); |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // We consumed one 16 bit character |
| // |
| input->nextChar = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| // Note that we did not check for an invalid low surrogate here, or that fact that the |
| // lo surrogate was missing. We just picked out one 16 bit character unless the character |
| // was a valid hi surrogate, in whcih case we consumed two 16 bit characters. |
| // |
| } |
| } |
| |
| /// \brief Return the input element assuming an 8 bit ascii input |
| /// |
| /// \param[in] input Input stream context pointer |
| /// \param[in] la 1 based offset of next input stream element |
| /// |
| /// \return Next input character in internal ANTLR3 encoding (UTF32) |
| /// |
| static ANTLR3_UCHAR |
| antlr3UTF16LA(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| UTF32 ch; |
| UTF32 ch2; |
| UTF16 * nextChar; |
| |
| // Find the input interface and where we are currently pointing to |
| // in the input stream |
| // |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| nextChar = input->nextChar; |
| |
| // If a positive offset then advance forward, else retreat |
| // |
| if (la >= 0) |
| { |
| while (--la > 0 && (pANTLR3_UINT8)nextChar < ((pANTLR3_UINT8)input->data) + input->sizeBuf ) |
| { |
| // Advance our copy of the input pointer |
| // |
| // Next char in natural machine byte order |
| // |
| ch = *nextChar++; |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) |
| { |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Next character is in natural machine byte order |
| // |
| ch2 = *nextChar; |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // We consumed one 16 bit character |
| // |
| nextChar++; |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| // Note that we did not check for an invalid low surrogate here, or that fact that the |
| // lo surrogate was missing. We just picked out one 16 bit character unless the character |
| // was a valid hi surrogate, in whcih case we consumed two 16 bit characters. |
| // |
| } |
| } |
| else |
| { |
| // We need to go backwards from our input point |
| // |
| while (la++ < 0 && (pANTLR3_UINT8)nextChar > (pANTLR3_UINT8)input->data ) |
| { |
| // Get the previous 16 bit character |
| // |
| ch = *--nextChar; |
| |
| // If we found a low surrogate then go back one more character if |
| // the hi surrogate is there |
| // |
| if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) |
| { |
| ch2 = *(nextChar-1); |
| if (ch2 >= UNI_SUR_HIGH_START && ch2 <= UNI_SUR_HIGH_END) |
| { |
| // Yes, there is a high surrogate to match it so decrement one more and point to that |
| // |
| nextChar--; |
| } |
| } |
| } |
| } |
| |
| // Our local copy of nextChar is now pointing to either the correct character or end of file |
| // |
| // Input buffer size is always in bytes |
| // |
| if ( (pANTLR3_UINT8)nextChar >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| // Pick up the next 16 character (native machine byte order) |
| // |
| ch = *nextChar++; |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) |
| { |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Next character is in natural machine byte order |
| // |
| ch2 = *nextChar; |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // Construct the UTF32 code point |
| // |
| ch = ((ch - UNI_SUR_HIGH_START) << halfShift) |
| + (ch2 - UNI_SUR_LOW_START) + halfBase; |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| } |
| return ch; |
| } |
| |
| |
| /// \brief Calculate the current index in the output stream. |
| /// \param[in] input Input stream context pointer |
| /// |
| static ANTLR3_MARKER |
| antlr3UTF16Index(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| return (ANTLR3_MARKER)(input->nextChar); |
| } |
| |
| /// \brief Rewind the lexer input to the state specified by the supplied mark. |
| /// |
| /// \param[in] input Input stream context pointer |
| /// |
| /// \remark |
| /// Assumes UTF16 input stream. |
| /// |
| static void |
| antlr3UTF16Seek (pANTLR3_INT_STREAM is, ANTLR3_MARKER seekPoint) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) is->super); |
| |
| // If the requested seek point is less than the current |
| // input point, then we assume that we are resetting from a mark |
| // and do not need to scan, but can just set to there as rewind will |
| // reset line numbers and so on. |
| // |
| if (seekPoint <= (ANTLR3_MARKER)(input->nextChar)) |
| { |
| input->nextChar = (void *)seekPoint; |
| } |
| else |
| { |
| // Call consume until we reach the asked for seek point or EOF |
| // |
| while (is->_LA(is, 1) != ANTLR3_CHARSTREAM_EOF && seekPoint < (ANTLR3_MARKER)input->nextChar) |
| { |
| is->consume(is); |
| } |
| } |
| } |
| /// \brief Return a substring of the UTF16 input stream in |
| /// newly allocated memory. |
| /// |
| /// \param input Input stream context pointer |
| /// \param start Offset in input stream where the string starts |
| /// \param stop Offset in the input stream where the string ends. |
| /// |
| static pANTLR3_STRING |
| antlr3UTF16Substr (pANTLR3_INPUT_STREAM input, ANTLR3_MARKER start, ANTLR3_MARKER stop) |
| { |
| return input->strFactory->newPtr(input->strFactory, (pANTLR3_UINT8)start, ((ANTLR3_UINT32_CAST(stop - start))/2) + 1); |
| } |
| |
| /// \brief Consume the next character in a UTF16 input stream when the input is Little Endian and the machine is not |
| /// Note that the UTF16 routines do not do any substantial verification of the input stream as for performance |
| /// sake, we assume it is validly encoded. So if a low surrogate is found at the curent input position then we |
| /// just consume it. Surrogate pairs should be seen as Hi, Lo. So if we have a Lo first, then the input stream |
| /// is fubar but we just ignore that. |
| /// |
| /// \param input Input stream context pointer |
| /// |
| static void |
| antlr3UTF16ConsumeLE(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| UTF32 ch; |
| UTF32 ch2; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| // Buffer size is always in bytes |
| // |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Indicate one more character in this line |
| // |
| input->charPositionInLine++; |
| |
| if ((ANTLR3_UCHAR)(*((pANTLR3_UINT16)input->nextChar)) == input->newlineChar) |
| { |
| // Reset for start of a new line of input |
| // |
| input->line++; |
| input->charPositionInLine = 0; |
| input->currentLine = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| } |
| |
| // Increment to next character position, accounting for any surrogates |
| // |
| // Next char in litle endian form |
| // |
| ch = *((pANTLR3_UINT8)input->nextChar) + (*((pANTLR3_UINT8)input->nextChar + 1) <<8); |
| |
| // We consumed one 16 bit character |
| // |
| input->nextChar = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) { |
| |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| ch2 = *((pANTLR3_UINT8)input->nextChar) + (*((pANTLR3_UINT8)input->nextChar + 1) <<8); |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // We consumed one 16 bit character |
| // |
| input->nextChar = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| // Note that we did not check for an invalid low surrogate here, or that fact that the |
| // lo surrogate was missing. We just picked out one 16 bit character unless the character |
| // was a valid hi surrogate, in whcih case we consumed two 16 bit characters. |
| // |
| } |
| } |
| |
| /// \brief Return the input element assuming a UTF16 input when the input is Little Endian and the machine is not |
| /// |
| /// \param[in] input Input stream context pointer |
| /// \param[in] la 1 based offset of next input stream element |
| /// |
| /// \return Next input character in internal ANTLR3 encoding (UTF32) |
| /// |
| static ANTLR3_UCHAR |
| antlr3UTF16LALE(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| UTF32 ch; |
| UTF32 ch2; |
| pANTLR3_UCHAR nextChar; |
| |
| // Find the input interface and where we are currently pointing to |
| // in the input stream |
| // |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| nextChar = input->nextChar; |
| |
| // If a positive offset then advance forward, else retreat |
| // |
| if (la >= 0) |
| { |
| while (--la > 0 && (pANTLR3_UINT8)nextChar < ((pANTLR3_UINT8)input->data) + input->sizeBuf ) |
| { |
| // Advance our copy of the input pointer |
| // |
| // Next char in Little Endian byte order |
| // |
| ch = (*nextChar) + (*(nextChar+1) << 8); |
| nextChar += 2; |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) |
| { |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Next character is in little endian byte order |
| // |
| ch2 = (*nextChar) + (*(nextChar+1) << 8); |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // We consumed one 16 bit character |
| // |
| nextChar += 2; |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| // Note that we did not check for an invalid low surrogate here, or that fact that the |
| // lo surrogate was missing. We just picked out one 16 bit character unless the character |
| // was a valid hi surrogate, in whcih case we consumed two 16 bit characters. |
| // |
| } |
| } |
| else |
| { |
| // We need to go backwards from our input point |
| // |
| while (la++ < 0 && (pANTLR3_UINT8)nextChar > (pANTLR3_UINT8)input->data ) |
| { |
| // Get the previous 16 bit character |
| // |
| ch = (*nextChar - 2) + ((*nextChar -1) << 8); |
| nextChar -= 2; |
| |
| // If we found a low surrogate then go back one more character if |
| // the hi surrogate is there |
| // |
| if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) |
| { |
| ch2 = (*nextChar - 2) + ((*nextChar -1) << 8); |
| if (ch2 >= UNI_SUR_HIGH_START && ch2 <= UNI_SUR_HIGH_END) |
| { |
| // Yes, there is a high surrogate to match it so decrement one more and point to that |
| // |
| nextChar -=2; |
| } |
| } |
| } |
| } |
| |
| // Our local copy of nextChar is now pointing to either the correct character or end of file |
| // |
| // Input buffer size is always in bytes |
| // |
| if ( (pANTLR3_UINT8)nextChar >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| // Pick up the next 16 character (little endian byte order) |
| // |
| ch = (*nextChar) + (*(nextChar+1) << 8); |
| nextChar += 2; |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) |
| { |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Next character is in little endian byte order |
| // |
| ch2 = (*nextChar) + (*(nextChar+1) << 8); |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // Construct the UTF32 code point |
| // |
| ch = ((ch - UNI_SUR_HIGH_START) << halfShift) |
| + (ch2 - UNI_SUR_LOW_START) + halfBase; |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| } |
| return ch; |
| } |
| |
| /// \brief Consume the next character in a UTF16 input stream when the input is Big Endian and the machine is not |
| /// |
| /// \param input Input stream context pointer |
| /// |
| static void |
| antlr3UTF16ConsumeBE(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| UTF32 ch; |
| UTF32 ch2; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| // Buffer size is always in bytes |
| // |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Indicate one more character in this line |
| // |
| input->charPositionInLine++; |
| |
| if ((ANTLR3_UCHAR)(*((pANTLR3_UINT16)input->nextChar)) == input->newlineChar) |
| { |
| // Reset for start of a new line of input |
| // |
| input->line++; |
| input->charPositionInLine = 0; |
| input->currentLine = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| } |
| |
| // Increment to next character position, accounting for any surrogates |
| // |
| // Next char in big endian form |
| // |
| ch = *((pANTLR3_UINT8)input->nextChar + 1) + (*((pANTLR3_UINT8)input->nextChar ) <<8); |
| |
| // We consumed one 16 bit character |
| // |
| input->nextChar = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) { |
| |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Big endian |
| // |
| ch2 = *((pANTLR3_UINT8)input->nextChar + 1) + (*((pANTLR3_UINT8)input->nextChar ) <<8); |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // We consumed one 16 bit character |
| // |
| input->nextChar = (void *)(((pANTLR3_UINT16)input->nextChar) + 1); |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| // Note that we did not check for an invalid low surrogate here, or that fact that the |
| // lo surrogate was missing. We just picked out one 16 bit character unless the character |
| // was a valid hi surrogate, in whcih case we consumed two 16 bit characters. |
| // |
| } |
| } |
| |
| /// \brief Return the input element assuming a UTF16 input when the input is Little Endian and the machine is not |
| /// |
| /// \param[in] input Input stream context pointer |
| /// \param[in] la 1 based offset of next input stream element |
| /// |
| /// \return Next input character in internal ANTLR3 encoding (UTF32) |
| /// |
| static ANTLR3_UCHAR |
| antlr3UTF16LABE(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| UTF32 ch; |
| UTF32 ch2; |
| pANTLR3_UCHAR nextChar; |
| |
| // Find the input interface and where we are currently pointing to |
| // in the input stream |
| // |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| nextChar = input->nextChar; |
| |
| // If a positive offset then advance forward, else retreat |
| // |
| if (la >= 0) |
| { |
| while (--la > 0 && (pANTLR3_UINT8)nextChar < ((pANTLR3_UINT8)input->data) + input->sizeBuf ) |
| { |
| // Advance our copy of the input pointer |
| // |
| // Next char in Big Endian byte order |
| // |
| ch = ((*nextChar) << 8) + *(nextChar+1); |
| nextChar += 2; |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) |
| { |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Next character is in big endian byte order |
| // |
| ch2 = ((*nextChar) << 8) + *(nextChar+1); |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // We consumed one 16 bit character |
| // |
| nextChar += 2; |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| // Note that we did not check for an invalid low surrogate here, or that fact that the |
| // lo surrogate was missing. We just picked out one 16 bit character unless the character |
| // was a valid hi surrogate, in whcih case we consumed two 16 bit characters. |
| // |
| } |
| } |
| else |
| { |
| // We need to go backwards from our input point |
| // |
| while (la++ < 0 && (pANTLR3_UINT8)nextChar > (pANTLR3_UINT8)input->data ) |
| { |
| // Get the previous 16 bit character |
| // |
| ch = ((*nextChar - 2) << 8) + (*nextChar -1); |
| nextChar -= 2; |
| |
| // If we found a low surrogate then go back one more character if |
| // the hi surrogate is there |
| // |
| if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) |
| { |
| ch2 = ((*nextChar - 2) << 8) + (*nextChar -1); |
| if (ch2 >= UNI_SUR_HIGH_START && ch2 <= UNI_SUR_HIGH_END) |
| { |
| // Yes, there is a high surrogate to match it so decrement one more and point to that |
| // |
| nextChar -=2; |
| } |
| } |
| } |
| } |
| |
| // Our local copy of nextChar is now pointing to either the correct character or end of file |
| // |
| // Input buffer size is always in bytes |
| // |
| if ( (pANTLR3_UINT8)nextChar >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| // Pick up the next 16 character (big endian byte order) |
| // |
| ch = ((*nextChar) << 8) + *(nextChar+1); |
| nextChar += 2; |
| |
| // If we have a surrogate pair then we need to consume |
| // a following valid LO surrogate. |
| // |
| if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) |
| { |
| // If the 16 bits following the high surrogate are in the source buffer... |
| // |
| if ((pANTLR3_UINT8)(nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Next character is in big endian byte order |
| // |
| ch2 = ((*nextChar) << 8) + *(nextChar+1); |
| |
| // If it's a valid low surrogate, consume it |
| // |
| if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) |
| { |
| // Construct the UTF32 code point |
| // |
| ch = ((ch - UNI_SUR_HIGH_START) << halfShift) |
| + (ch2 - UNI_SUR_LOW_START) + halfBase; |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it. |
| // |
| } |
| // Note that we ignore a valid hi surrogate that has no lo surrogate to go with |
| // it because the buffer ended |
| // |
| } |
| } |
| return ch; |
| } |
| |
| /// \brief Common function to setup function interface for a UTF3 input stream. |
| /// |
| /// \param input Input stream context pointer |
| /// |
| void |
| antlr3UTF32SetupStream (pANTLR3_INPUT_STREAM input, ANTLR3_BOOLEAN machineBigEndian, ANTLR3_BOOLEAN inputBigEndian) |
| { |
| // Build a string factory for this stream. This is a UTF32 string factory which is a standard |
| // part of the ANTLR3 string. The string factory is then passed through the whole chain of lexer->parser->tree->treeparser |
| // and so on. |
| // |
| input->strFactory = antlr3StringFactoryNew(input->encoding); |
| |
| // Generic API that does not care about endianess. |
| // |
| input->istream->index = antlr3UTF32Index; // Calculate current index in input stream, UTF16 based |
| input->substr = antlr3UTF32Substr; // Return a string from the input stream |
| input->istream->seek = antlr3UTF32Seek; // How to seek to a specific point in the stream |
| input->istream->consume = antlr3UTF32Consume; // Consume the next UTF32 character in the buffer |
| |
| // We must install different UTF32 LA routines according to whether the input |
| // is the same endianess as the machine we are executing upon or not. If it is not |
| // then we must install methods that can convert the endianess on the fly as they go |
| // |
| switch (machineBigEndian) |
| { |
| case ANTLR3_TRUE: |
| |
| // Machine is Big Endian, if the input is also then install the |
| // methods that do not access input by bytes and reverse them. |
| // Otherwise install endian aware methods. |
| // |
| if (inputBigEndian == ANTLR3_TRUE) |
| { |
| // Input is machine compatible |
| // |
| input->istream->_LA = antlr3UTF32LA; // Return the UTF32 character at offset n (1 based) |
| } |
| else |
| { |
| // Need to use methods that know that the input is little endian |
| // |
| input->istream->_LA = antlr3UTF32LALE; // Return the UTF32 character at offset n (1 based) |
| } |
| break; |
| |
| case ANTLR3_FALSE: |
| |
| // Machine is Little Endian, if the input is also then install the |
| // methods that do not access input by bytes and reverse them. |
| // Otherwise install endian aware methods. |
| // |
| if (inputBigEndian == ANTLR3_FALSE) |
| { |
| // Input is machine compatible |
| // |
| input->istream->_LA = antlr3UTF32LA; // Return the UTF32 character at offset n (1 based) |
| } |
| else |
| { |
| // Need to use methods that know that the input is Big Endian |
| // |
| input->istream->_LA = antlr3UTF32LABE; // Return the UTF32 character at offset n (1 based) |
| } |
| break; |
| } |
| |
| input->charByteSize = 4; // Size in bytes of characters in this stream. |
| } |
| |
| /** \brief Consume the next character in a UTF32 input stream |
| * |
| * \param input Input stream context pointer |
| */ |
| static void |
| antlr3UTF32Consume(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| // SizeBuf is always in bytes |
| // |
| if ((pANTLR3_UINT8)(input->nextChar) < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| /* Indicate one more character in this line |
| */ |
| input->charPositionInLine++; |
| |
| if ((ANTLR3_UCHAR)(*((pANTLR3_UINT32)input->nextChar)) == input->newlineChar) |
| { |
| /* Reset for start of a new line of input |
| */ |
| input->line++; |
| input->charPositionInLine = 0; |
| input->currentLine = (void *)(((pANTLR3_UINT32)input->nextChar) + 1); |
| } |
| |
| /* Increment to next character position |
| */ |
| input->nextChar = (void *)(((pANTLR3_UINT32)input->nextChar) + 1); |
| } |
| } |
| |
| /// \brief Calculate the current index in the output stream. |
| /// \param[in] input Input stream context pointer |
| /// |
| static ANTLR3_MARKER |
| antlr3UTF32Index(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| return (ANTLR3_MARKER)(input->nextChar); |
| } |
| |
| /// \brief Return a substring of the UTF16 input stream in |
| /// newly allocated memory. |
| /// |
| /// \param input Input stream context pointer |
| /// \param start Offset in input stream where the string starts |
| /// \param stop Offset in the input stream where the string ends. |
| /// |
| static pANTLR3_STRING |
| antlr3UTF32Substr (pANTLR3_INPUT_STREAM input, ANTLR3_MARKER start, ANTLR3_MARKER stop) |
| { |
| return input->strFactory->newPtr(input->strFactory, (pANTLR3_UINT8)start, ((ANTLR3_UINT32_CAST(stop - start))/4) + 1); |
| } |
| |
| /// \brief Rewind the lexer input to the state specified by the supplied mark. |
| /// |
| /// \param[in] input Input stream context pointer |
| /// |
| /// \remark |
| /// Assumes UTF32 input stream. |
| /// |
| static void |
| antlr3UTF32Seek (pANTLR3_INT_STREAM is, ANTLR3_MARKER seekPoint) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) is->super); |
| |
| // If the requested seek point is less than the current |
| // input point, then we assume that we are resetting from a mark |
| // and do not need to scan, but can just set to there as rewind will |
| // reset line numbers and so on. |
| // |
| if (seekPoint <= (ANTLR3_MARKER)(input->nextChar)) |
| { |
| input->nextChar = (void *)seekPoint; |
| } |
| else |
| { |
| // Call consume until we reach the asked for seek point or EOF |
| // |
| while (is->_LA(is, 1) != ANTLR3_CHARSTREAM_EOF && seekPoint < (ANTLR3_MARKER)input->nextChar) |
| { |
| is->consume(is); |
| } |
| } |
| } |
| |
| /** \brief Return the input element assuming a UTF32 input in natural machine byte order |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] la 1 based offset of next input stream element |
| * |
| * \return Next input character in internal ANTLR3 encoding (UTF32) |
| */ |
| static ANTLR3_UCHAR |
| antlr3UTF32LA(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| if (( ((pANTLR3_UINT8)input->nextChar) + la - 1) >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| return (ANTLR3_UCHAR)(*((pANTLR3_UINT32)input->nextChar + la - 1)); |
| } |
| } |
| |
| /** \brief Return the input element assuming a UTF32 input in little endian byte order |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] la 1 based offset of next input stream element |
| * |
| * \return Next input character in internal ANTLR3 encoding (UTF32) |
| */ |
| static ANTLR3_UCHAR |
| antlr3UTF32LALE(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| if (( ((pANTLR3_UINT8)input->nextChar) + la - 1) >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| ANTLR3_UCHAR c; |
| |
| c = (ANTLR3_UCHAR)(*((pANTLR3_UINT32)input->nextChar + la - 1)); |
| |
| // Swap Endianess to Big Endian |
| // |
| return (c>>24) | ((c<<8) & 0x00FF0000) | ((c>>8) & 0x0000FF00) | (c<<24); |
| } |
| } |
| |
| /** \brief Return the input element assuming a UTF32 input in big endian byte order |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] la 1 based offset of next input stream element |
| * |
| * \return Next input character in internal ANTLR3 encoding (UTF32) |
| * \remark This is the same code as LE version but seprated in case there are better optimisations fo rendinan swap |
| */ |
| static ANTLR3_UCHAR |
| antlr3UTF32LABE(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| if (( ((pANTLR3_UINT8)input->nextChar) + la - 1) >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| ANTLR3_UCHAR c; |
| |
| c = (ANTLR3_UCHAR)(*((pANTLR3_UINT32)input->nextChar + la - 1)); |
| |
| // Swap Endianess to Little Endian |
| // |
| return (c>>24) | ((c<<8) & 0x00FF0000) | ((c>>8) & 0x0000FF00) | (c<<24); |
| } |
| } |
| |
| |
| /// \brief Common function to setup function interface for a UTF8 input stream. |
| /// |
| /// \param input Input stream context pointer |
| /// |
| void |
| antlr3UTF8SetupStream (pANTLR3_INPUT_STREAM input) |
| { |
| // Build a string factory for this stream. This is a UTF16 string factory which is a standard |
| // part of the ANTLR3 string. The string factory is then passed through the whole chain of lexer->parser->tree->treeparser |
| // and so on. |
| // |
| input->strFactory = antlr3StringFactoryNew(input->encoding); |
| |
| // Generic API that does not care about endianess. |
| // |
| input->istream->consume = antlr3UTF8Consume; // Consume the next UTF32 character in the buffer |
| input->istream->_LA = antlr3UTF8LA; // Return the UTF32 character at offset n (1 based) |
| input->charByteSize = 0; // Size in bytes of characters in this stream. |
| } |
| |
| // ------------------------------------------------------ |
| // Following is from Unicode.org (see antlr3convertutf.c) |
| // |
| |
| /// Index into the table below with the first byte of a UTF-8 sequence to |
| /// get the number of trailing bytes that are supposed to follow it. |
| /// Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is |
| /// left as-is for anyone who may want to do such conversion, which was |
| /// allowed in earlier algorithms. |
| /// |
| static const ANTLR3_UINT32 trailingBytesForUTF8[256] = { |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 |
| }; |
| |
| /// Magic values subtracted from a buffer value during UTF8 conversion. |
| /// This table contains as many values as there might be trailing bytes |
| /// in a UTF-8 sequence. |
| /// |
| static const UTF32 offsetsFromUTF8[6] = |
| { 0x00000000UL, 0x00003080UL, 0x000E2080UL, |
| 0x03C82080UL, 0xFA082080UL, 0x82082080UL |
| }; |
| |
| // End of Unicode.org tables |
| // ------------------------- |
| |
| |
| /** \brief Consume the next character in a UTF8 input stream |
| * |
| * \param input Input stream context pointer |
| */ |
| static void |
| antlr3UTF8Consume(pANTLR3_INT_STREAM is) |
| { |
| pANTLR3_INPUT_STREAM input; |
| ANTLR3_UINT32 extraBytesToRead; |
| ANTLR3_UCHAR ch; |
| pANTLR3_UINT8 nextChar; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| nextChar = input->nextChar; |
| |
| if (nextChar < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Indicate one more character in this line |
| // |
| input->charPositionInLine++; |
| |
| // Are there more bytes needed to make up the whole thing? |
| // |
| extraBytesToRead = trailingBytesForUTF8[*nextChar]; |
| |
| if (nextChar + extraBytesToRead >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| input->nextChar = (((pANTLR3_UINT8)input->data) + input->sizeBuf); |
| return; |
| } |
| |
| // Cases deliberately fall through (see note A in antlrconvertutf.c) |
| // Legal UTF8 is only 4 bytes but 6 bytes could be used in old UTF8 so |
| // we allow it. |
| // |
| ch = 0; |
| switch (extraBytesToRead) { |
| case 5: ch += *nextChar++; ch <<= 6; |
| case 4: ch += *nextChar++; ch <<= 6; |
| case 3: ch += *nextChar++; ch <<= 6; |
| case 2: ch += *nextChar++; ch <<= 6; |
| case 1: ch += *nextChar++; ch <<= 6; |
| case 0: ch += *nextChar++; |
| } |
| |
| // Magically correct the input value |
| // |
| ch -= offsetsFromUTF8[extraBytesToRead]; |
| if (ch == input->newlineChar) |
| { |
| /* Reset for start of a new line of input |
| */ |
| input->line++; |
| input->charPositionInLine = 0; |
| input->currentLine = (void *)nextChar; |
| } |
| |
| // Update input pointer |
| // |
| input->nextChar = nextChar; |
| } |
| } |
| /** \brief Return the input element assuming a UTF8 input |
| * |
| * \param[in] input Input stream context pointer |
| * \param[in] la 1 based offset of next input stream element |
| * |
| * \return Next input character in internal ANTLR3 encoding (UTF32) |
| */ |
| static ANTLR3_UCHAR |
| antlr3UTF8LA(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| ANTLR3_UINT32 extraBytesToRead; |
| ANTLR3_UCHAR ch; |
| pANTLR3_UINT8 nextChar; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| nextChar = input->nextChar; |
| |
| // Do we need to traverse forwards or backwards? |
| // - LA(0) is treated as LA(1) and we assume that the nextChar is |
| // already positioned. |
| // - LA(n+) ; n>1 means we must traverse forward n-1 characters catering for UTF8 encoding |
| // - LA(-n) means we must traverse backwards n chracters |
| // |
| if (la > 1) { |
| |
| // Make sure that we have at least one character left before trying to |
| // loop through the buffer. |
| // |
| if (nextChar < (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| // Now traverse n-1 characters forward |
| // |
| while (--la > 0) |
| { |
| // Does the next character require trailing bytes? |
| // If so advance the pointer by that many bytes as well as advancing |
| // one position for what will be at least a single byte character. |
| // |
| nextChar += trailingBytesForUTF8[*nextChar] + 1; |
| |
| // Does that calculation take us past the byte length of the buffer? |
| // |
| if (nextChar >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| } |
| } |
| else |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| } |
| else |
| { |
| // LA is negative so we decrease the pointer by n character positions |
| // |
| while (nextChar > (pANTLR3_UINT8)input->data && la++ < 0) |
| { |
| // Traversing backwards in UTF8 means decermenting by one |
| // then continuing to decrement while ever a character pattern |
| // is flagged as being a trailing byte of an encoded code point. |
| // Trailing UTF8 bytes always start with 10 in binary. We assumne that |
| // the UTF8 is well formed and do not check boundary conditions |
| // |
| nextChar--; |
| while ((*nextChar & 0xC0) == 0x80) |
| { |
| nextChar--; |
| } |
| } |
| } |
| |
| // nextChar is now pointing at the UTF8 encoded character that we need to |
| // decode and return. |
| // |
| // Are there more bytes needed to make up the whole thing? |
| // |
| extraBytesToRead = trailingBytesForUTF8[*nextChar]; |
| if (nextChar + extraBytesToRead >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| |
| // Cases deliberately fall through (see note A in antlrconvertutf.c) |
| // |
| ch = 0; |
| switch (extraBytesToRead) { |
| case 5: ch += *nextChar++; ch <<= 6; |
| case 4: ch += *nextChar++; ch <<= 6; |
| case 3: ch += *nextChar++; ch <<= 6; |
| case 2: ch += *nextChar++; ch <<= 6; |
| case 1: ch += *nextChar++; ch <<= 6; |
| case 0: ch += *nextChar++; |
| } |
| |
| // Magically correct the input value |
| // |
| ch -= offsetsFromUTF8[extraBytesToRead]; |
| |
| return ch; |
| } |
| |
| // EBCDIC to ASCII conversion table |
| // |
| // This for EBCDIC EDF04 translated to ISO-8859.1 which is the usually accepted POSIX |
| // translation and the character tables are published all over the interweb. |
| // |
| const ANTLR3_UCHAR e2a[256] = |
| { |
| 0x00, 0x01, 0x02, 0x03, 0x85, 0x09, 0x86, 0x7f, |
| 0x87, 0x8d, 0x8e, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, |
| 0x10, 0x11, 0x12, 0x13, 0x8f, 0x0a, 0x08, 0x97, |
| 0x18, 0x19, 0x9c, 0x9d, 0x1c, 0x1d, 0x1e, 0x1f, |
| 0x80, 0x81, 0x82, 0x83, 0x84, 0x92, 0x17, 0x1b, |
| 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x05, 0x06, 0x07, |
| 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, |
| 0x98, 0x99, 0x9a, 0x9b, 0x14, 0x15, 0x9e, 0x1a, |
| 0x20, 0xa0, 0xe2, 0xe4, 0xe0, 0xe1, 0xe3, 0xe5, |
| 0xe7, 0xf1, 0x60, 0x2e, 0x3c, 0x28, 0x2b, 0x7c, |
| 0x26, 0xe9, 0xea, 0xeb, 0xe8, 0xed, 0xee, 0xef, |
| 0xec, 0xdf, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x9f, |
| 0x2d, 0x2f, 0xc2, 0xc4, 0xc0, 0xc1, 0xc3, 0xc5, |
| 0xc7, 0xd1, 0x5e, 0x2c, 0x25, 0x5f, 0x3e, 0x3f, |
| 0xf8, 0xc9, 0xca, 0xcb, 0xc8, 0xcd, 0xce, 0xcf, |
| 0xcc, 0xa8, 0x3a, 0x23, 0x40, 0x27, 0x3d, 0x22, |
| 0xd8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, |
| 0x68, 0x69, 0xab, 0xbb, 0xf0, 0xfd, 0xfe, 0xb1, |
| 0xb0, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, |
| 0x71, 0x72, 0xaa, 0xba, 0xe6, 0xb8, 0xc6, 0xa4, |
| 0xb5, 0xaf, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
| 0x79, 0x7a, 0xa1, 0xbf, 0xd0, 0xdd, 0xde, 0xae, |
| 0xa2, 0xa3, 0xa5, 0xb7, 0xa9, 0xa7, 0xb6, 0xbc, |
| 0xbd, 0xbe, 0xac, 0x5b, 0x5c, 0x5d, 0xb4, 0xd7, |
| 0xf9, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, |
| 0x48, 0x49, 0xad, 0xf4, 0xf6, 0xf2, 0xf3, 0xf5, |
| 0xa6, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, |
| 0x51, 0x52, 0xb9, 0xfb, 0xfc, 0xdb, 0xfa, 0xff, |
| 0xd9, 0xf7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
| 0x59, 0x5a, 0xb2, 0xd4, 0xd6, 0xd2, 0xd3, 0xd5, |
| 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, |
| 0x38, 0x39, 0xb3, 0x7b, 0xdc, 0x7d, 0xda, 0x7e |
| }; |
| |
| /// \brief Common function to setup function interface for a EBCDIC input stream. |
| /// |
| /// \param input Input stream context pointer |
| /// |
| void |
| antlr3EBCDICSetupStream (pANTLR3_INPUT_STREAM input) |
| { |
| // EBCDIC streams can use the standard 8 bit string factory |
| // |
| input->strFactory = antlr3StringFactoryNew(input->encoding); |
| |
| // Generic API that does not care about endianess. |
| // |
| input->istream->_LA = antlr3EBCDICLA; // Return the UTF32 character at offset n (1 based) |
| input->charByteSize = 1; // Size in bytes of characters in this stream. |
| } |
| |
| /// \brief Return the input element assuming an 8 bit EBCDIC input |
| /// |
| /// \param[in] input Input stream context pointer |
| /// \param[in] la 1 based offset of next input stream element |
| /// |
| /// \return Next input character in internal ANTLR3 encoding (UTF32) after translation |
| /// from EBCDIC to ASCII |
| /// |
| static ANTLR3_UCHAR |
| antlr3EBCDICLA(pANTLR3_INT_STREAM is, ANTLR3_INT32 la) |
| { |
| pANTLR3_INPUT_STREAM input; |
| |
| input = ((pANTLR3_INPUT_STREAM) (is->super)); |
| |
| if (( ((pANTLR3_UINT8)input->nextChar) + la - 1) >= (((pANTLR3_UINT8)input->data) + input->sizeBuf)) |
| { |
| return ANTLR3_CHARSTREAM_EOF; |
| } |
| else |
| { |
| // Translate the required character via the constant conversion table |
| // |
| return e2a[(*((pANTLR3_UINT8)input->nextChar + la - 1))]; |
| } |
| } |
