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/*
* Smithsonian Astrophysical Observatory, Cambridge, MA, USA
* This code has been modified under the terms listed below and is made
* available under the same terms.
*/
/*
* bltParse.c --
*
* Contains a collection of procedures that are used to parse Tcl
* commands or parts of commands (like quoted strings or nested
* sub-commands).
*
* This file is copied from tclParse.c in the TCL library distribution.
*
* Copyright (c) 1987-1993 The Regents of the University of
* California.
*
* Copyright (c) 1994-1998 Sun Microsystems, Inc.
*
*/
/*
* Since TCL 8.1.0 these routines have been replaced by ones that
* generate byte-codes. But since these routines are used in vector
* expressions, where no such byte-compilation is necessary, I now
* include them. In fact, the byte-compiled versions would be slower
* since the compiled code typically runs only one time.
*/
#include "bltInt.h"
#include "bltParse.h"
/*
* A table used to classify input characters to assist in parsing
* TCL commands. The table should be indexed with a signed character
* using the CHAR_TYPE macro. The character may have a negative
* value. The CHAR_TYPE macro takes a pointer to a signed character
* and a pointer to the last character in the source string. If the
* src pointer is pointing at the terminating null of the string,
* CHAR_TYPE returns TCL_COMMAND_END.
*/
#define STATIC_STRING_SPACE 150
#define TCL_NORMAL 0x01
#define TCL_SPACE 0x02
#define TCL_COMMAND_END 0x04
#define TCL_QUOTE 0x08
#define TCL_OPEN_BRACKET 0x10
#define TCL_OPEN_BRACE 0x20
#define TCL_CLOSE_BRACE 0x40
#define TCL_BACKSLASH 0x80
#define TCL_DOLLAR 0x00
/*
* The following table assigns a type to each character. Only types
* meaningful to TCL parsing are represented here. The table is
* designed to be referenced with either signed or unsigned characters,
* so it has 384 entries. The first 128 entries correspond to negative
* character values, the next 256 correspond to positive character
* values. The last 128 entries are identical to the first 128. The
* table is always indexed with a 128-byte offset (the 128th entry
* corresponds to a 0 character value).
*/
static unsigned char tclTypeTable[] =
{
/*
* Negative character values, from -128 to -1:
*/
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
/*
* Positive character values, from 0-127:
*/
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_SPACE, TCL_COMMAND_END, TCL_SPACE,
TCL_SPACE, TCL_SPACE, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_SPACE, TCL_NORMAL, TCL_QUOTE, TCL_NORMAL,
TCL_DOLLAR, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_COMMAND_END,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_OPEN_BRACKET,
TCL_BACKSLASH, TCL_COMMAND_END, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_OPEN_BRACE,
TCL_NORMAL, TCL_CLOSE_BRACE, TCL_NORMAL, TCL_NORMAL,
/*
* Large unsigned character values, from 128-255:
*/
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
TCL_NORMAL, TCL_NORMAL, TCL_NORMAL, TCL_NORMAL,
};
#define CHAR_TYPE(src,last) \
(((src)==(last))?TCL_COMMAND_END:(tclTypeTable+128)[(int)*(src)])
/*
*---------------------------------------------------------------------------
*
* Blt_ParseNestedCmd --
*
* This procedure parses a nested TCL command between
* brackets, returning the result of the command.
*
* Results:
* The return value is a standard TCL result, which is
* TCL_OK unless there was an error while executing the
* nested command. If an error occurs then interp->result
* contains a standard error message. *TermPtr is filled
* in with the address of the character just after the
* last one processed; this is usually the character just
* after the matching close-bracket, or the null character
* at the end of the string if the close-bracket was missing
* (a missing close bracket is an error). The result returned
* by the command is stored in standard fashion in *parsePtr,
* null-terminated, with parsePtr->next pointing to the null
* character.
*
* Side effects:
* The storage space at *parsePtr may be expanded.
*
*---------------------------------------------------------------------------
*/
int Blt_ParseNestedCmd(
Tcl_Interp *interp, /* Interpreter to use for nested command
* evaluations and error messages. */
const char *string, /* Character just after opening bracket. */
int flags, /* Flags to pass to nested Tcl_Eval. */
const char **termPtr, /* Store address of terminating character
* here. */
ParseValue *parsePtr) /* Information about where to place
* result of command. */
{
return TCL_ERROR;
}
/*
*---------------------------------------------------------------------------
*
* Blt_ParseBraces --
*
* This procedure scans the information between matching
* curly braces.
*
* Results:
* The return value is a standard TCL result, which is
* TCL_OK unless there was an error while parsing string.
* If an error occurs then interp->result contains a
* standard error message. *TermPtr is filled
* in with the address of the character just after the
* last one successfully processed; this is usually the
* character just after the matching close-brace. The
* information between curly braces is stored in standard
* fashion in *parsePtr, null-terminated with parsePtr->next
* pointing to the terminating null character.
*
* Side effects:
* The storage space at *parsePtr may be expanded.
*
*---------------------------------------------------------------------------
*/
int Blt_ParseBraces(
Tcl_Interp *interp, /* Interpreter to use for nested command
* evaluations and error messages. */
const char *string, /* Character just after opening bracket. */
const char **termPtr, /* Store address of terminating character
* here. */
ParseValue *parsePtr) /* Information about where to place
* result of command. */
{
int level;
const char *src;
char *dest, *end;
char c;
const char *lastChar = string + strlen(string);
src = string;
dest = parsePtr->next;
end = parsePtr->end;
level = 1;
/*
* Copy the characters one at a time to the result area, stopping
* when the matching close-brace is found.
*/
for (;;) {
c = *src;
src++;
if (dest == end) {
parsePtr->next = dest;
(*parsePtr->expandProc) (parsePtr, 20);
dest = parsePtr->next;
end = parsePtr->end;
}
*dest = c;
dest++;
if (CHAR_TYPE(src - 1, lastChar) == TCL_NORMAL) {
continue;
} else if (c == '{') {
level++;
} else if (c == '}') {
level--;
if (level == 0) {
dest--; /* Don't copy the last close brace. */
break;
}
} else if (c == '\\') {
int count;
/*
* Must always squish out backslash-newlines, even when in
* braces. This is needed so that this sequence can appear
* anywhere in a command, such as the middle of an expression.
*/
if (*src == '\n') {
dest[-1] = Tcl_Backslash(src - 1, &count);
src += count - 1;
} else {
Tcl_Backslash(src - 1, &count);
while (count > 1) {
if (dest == end) {
parsePtr->next = dest;
(*parsePtr->expandProc) (parsePtr, 20);
dest = parsePtr->next;
end = parsePtr->end;
}
*dest = *src;
dest++;
src++;
count--;
}
}
} else if (c == '\0') {
Tcl_AppendResult(interp, "missing close-brace", (char *)NULL);
*termPtr = string - 1;
return TCL_ERROR;
}
}
*dest = '\0';
parsePtr->next = dest;
*termPtr = src;
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* Blt_ExpandParseValue --
*
* This procedure is commonly used as the value of the
* expandProc in a ParseValue. It uses malloc to allocate
* more space for the result of a parse.
*
* Results:
* The buffer space in *parsePtr is reallocated to something
* larger, and if parsePtr->clientData is non-zero the old
* buffer is freed. Information is copied from the old
* buffer to the new one.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
void Blt_ExpandParseValue(
ParseValue *parsePtr, /* Information about buffer that
* must be expanded. If the clientData
* in the structure is non-zero, it
* means that the current buffer is
* dynamically allocated. */
int needed) /* Minimum amount of additional space
* to allocate. */
{
int size;
char *buffer;
/*
* Either double the size of the buffer or add enough new space
* to meet the demand, whichever produces a larger new buffer.
*/
size = (parsePtr->end - parsePtr->buffer) + 1;
if (size < needed) {
size += needed;
} else {
size += size;
}
buffer = malloc((unsigned int)size);
/*
* Copy from old buffer to new, free old buffer if needed, and
* mark new buffer as malloc-ed.
*/
memcpy((VOID *) buffer, (VOID *) parsePtr->buffer,
(size_t) (parsePtr->next - parsePtr->buffer));
parsePtr->next = buffer + (parsePtr->next - parsePtr->buffer);
if (parsePtr->clientData != 0) {
free(parsePtr->buffer);
}
parsePtr->buffer = buffer;
parsePtr->end = buffer + size - 1;
parsePtr->clientData = (ClientData)1;
}
/*
*---------------------------------------------------------------------------
*
* Blt_ParseQuotes --
*
* This procedure parses a double-quoted string such as a
* quoted TCL command argument or a quoted value in a Tcl
* expression. This procedure is also used to parse array
* element names within parentheses, or anything else that
* needs all the substitutions that happen in quotes.
*
* Results:
* The return value is a standard TCL result, which is
* TCL_OK unless there was an error while parsing the
* quoted string. If an error occurs then interp->result
* contains a standard error message. *TermPtr is filled
* in with the address of the character just after the
* last one successfully processed; this is usually the
* character just after the matching close-quote. The
* fully-substituted contents of the quotes are stored in
* standard fashion in *parsePtr, null-terminated with
* parsePtr->next pointing to the terminating null character.
*
* Side effects:
* The buffer space in parsePtr may be enlarged by calling its
* expandProc.
*
*---------------------------------------------------------------------------
*/
int Blt_ParseQuotes(
Tcl_Interp *interp, /* Interpreter to use for nested command
* evaluations and error messages. */
const char *string, /* Character just after opening double-
* quote. */
int termChar, /* Character that terminates "quoted" string
* (usually double-quote, but sometimes
* right-paren or something else). */
int flags, /* Flags to pass to nested Tcl_Eval calls. */
const char **termPtr, /* Store address of terminating character
* here. */
ParseValue *parsePtr) /* Information about where to place
* fully-substituted result of parse. */
{
const char *src;
char *dest, c;
const char *lastChar = string + strlen(string);
src = string;
dest = parsePtr->next;
for (;;) {
if (dest == parsePtr->end) {
/*
* Target buffer space is about to run out. Make more space.
*/
parsePtr->next = dest;
(*parsePtr->expandProc) (parsePtr, 1);
dest = parsePtr->next;
}
c = *src;
src++;
if (c == termChar) {
*dest = '\0';
parsePtr->next = dest;
*termPtr = src;
return TCL_OK;
} else if (CHAR_TYPE(src - 1, lastChar) == TCL_NORMAL) {
copy:
*dest = c;
dest++;
continue;
} else if (c == '$') {
int length;
const char *value;
value = Tcl_ParseVar(interp, src - 1, termPtr);
if (value == NULL) {
return TCL_ERROR;
}
src = *termPtr;
length = strlen(value);
if ((parsePtr->end - dest) <= length) {
parsePtr->next = dest;
(*parsePtr->expandProc) (parsePtr, length);
dest = parsePtr->next;
}
strcpy(dest, value);
dest += length;
continue;
} else if (c == '[') {
int result;
parsePtr->next = dest;
result = Blt_ParseNestedCmd(interp, src, flags, termPtr, parsePtr);
if (result != TCL_OK) {
return result;
}
src = *termPtr;
dest = parsePtr->next;
continue;
} else if (c == '\\') {
int nRead;
src--;
*dest = Tcl_Backslash(src, &nRead);
dest++;
src += nRead;
continue;
} else if (c == '\0') {
char buf[10];
Tcl_ResetResult(interp);
sprintf_s(buf, 10, "missing %c", termChar);
Tcl_SetStringObj(Tcl_GetObjResult(interp), buf, 9);
*termPtr = string - 1;
return TCL_ERROR;
} else {
goto copy;
}
}
}
|