[1] | 1 | /* |
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| 2 | * tclParse.c -- |
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| 3 | * |
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| 4 | * This file contains a collection of procedures that are used |
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| 5 | * to parse Tcl commands or parts of commands (like quoted |
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| 6 | * strings or nested sub-commands). |
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| 7 | * |
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| 8 | * Copyright (c) 1987-1993 The Regents of the University of California. |
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| 9 | * Copyright (c) 1994-1997 Sun Microsystems, Inc. |
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| 10 | * |
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| 11 | * See the file "license.terms" for information on usage and redistribution |
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| 12 | * of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 13 | * |
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| 14 | * RCS: @(#) $Id: tclParse.c,v 1.1 2008-06-04 13:58:09 demin Exp $ |
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| 15 | */ |
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| 16 | |
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| 17 | #include "tclInt.h" |
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| 18 | #include "tclPort.h" |
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| 19 | |
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| 20 | /* |
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| 21 | * Function prototypes for procedures local to this file: |
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| 22 | */ |
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| 23 | |
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| 24 | static char * QuoteEnd _ANSI_ARGS_((char *string, char *lastChar, |
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| 25 | int term)); |
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| 26 | static char * ScriptEnd _ANSI_ARGS_((char *p, char *lastChar, |
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| 27 | int nested)); |
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| 28 | static char * VarNameEnd _ANSI_ARGS_((char *string, char *lastChar)); |
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| 29 | |
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| 30 | /* |
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| 31 | *-------------------------------------------------------------- |
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| 32 | * |
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| 33 | * TclParseQuotes -- |
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| 34 | * |
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| 35 | * This procedure parses a double-quoted string such as a |
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| 36 | * quoted Tcl command argument or a quoted value in a Tcl |
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| 37 | * expression. This procedure is also used to parse array |
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| 38 | * element names within parentheses, or anything else that |
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| 39 | * needs all the substitutions that happen in quotes. |
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| 40 | * |
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| 41 | * Results: |
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| 42 | * The return value is a standard Tcl result, which is |
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| 43 | * TCL_OK unless there was an error while parsing the |
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| 44 | * quoted string. If an error occurs then interp->result |
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| 45 | * contains a standard error message. *TermPtr is filled |
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| 46 | * in with the address of the character just after the |
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| 47 | * last one successfully processed; this is usually the |
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| 48 | * character just after the matching close-quote. The |
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| 49 | * fully-substituted contents of the quotes are stored in |
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| 50 | * standard fashion in *pvPtr, null-terminated with |
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| 51 | * pvPtr->next pointing to the terminating null character. |
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| 52 | * |
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| 53 | * Side effects: |
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| 54 | * The buffer space in pvPtr may be enlarged by calling its |
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| 55 | * expandProc. |
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| 56 | * |
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| 57 | *-------------------------------------------------------------- |
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| 58 | */ |
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| 59 | |
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| 60 | int |
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| 61 | TclParseQuotes(interp, string, termChar, flags, termPtr, pvPtr) |
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| 62 | Tcl_Interp *interp; /* Interpreter to use for nested command |
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| 63 | * evaluations and error messages. */ |
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| 64 | char *string; /* Character just after opening double- |
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| 65 | * quote. */ |
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| 66 | int termChar; /* Character that terminates "quoted" string |
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| 67 | * (usually double-quote, but sometimes |
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| 68 | * right-paren or something else). */ |
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| 69 | int flags; /* Flags to pass to nested Tcl_Eval calls. */ |
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| 70 | char **termPtr; /* Store address of terminating character |
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| 71 | * here. */ |
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| 72 | ParseValue *pvPtr; /* Information about where to place |
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| 73 | * fully-substituted result of parse. */ |
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| 74 | { |
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| 75 | register char *src, *dst, c; |
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| 76 | char *lastChar = string + strlen(string); |
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| 77 | |
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| 78 | src = string; |
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| 79 | dst = pvPtr->next; |
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| 80 | |
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| 81 | while (1) { |
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| 82 | if (dst == pvPtr->end) { |
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| 83 | /* |
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| 84 | * Target buffer space is about to run out. Make more space. |
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| 85 | */ |
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| 86 | |
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| 87 | pvPtr->next = dst; |
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| 88 | (*pvPtr->expandProc)(pvPtr, 1); |
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| 89 | dst = pvPtr->next; |
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| 90 | } |
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| 91 | |
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| 92 | c = *src; |
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| 93 | src++; |
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| 94 | if (c == termChar) { |
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| 95 | *dst = '\0'; |
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| 96 | pvPtr->next = dst; |
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| 97 | *termPtr = src; |
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| 98 | return TCL_OK; |
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| 99 | } else if (CHAR_TYPE(src-1, lastChar) == TCL_NORMAL) { |
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| 100 | copy: |
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| 101 | *dst = c; |
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| 102 | dst++; |
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| 103 | continue; |
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| 104 | } else if (c == '$') { |
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| 105 | int length; |
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| 106 | char *value; |
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| 107 | |
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| 108 | value = Tcl_ParseVar(interp, src-1, termPtr); |
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| 109 | if (value == NULL) { |
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| 110 | return TCL_ERROR; |
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| 111 | } |
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| 112 | src = *termPtr; |
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| 113 | length = strlen(value); |
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| 114 | if ((pvPtr->end - dst) <= length) { |
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| 115 | pvPtr->next = dst; |
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| 116 | (*pvPtr->expandProc)(pvPtr, length); |
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| 117 | dst = pvPtr->next; |
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| 118 | } |
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| 119 | strcpy(dst, value); |
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| 120 | dst += length; |
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| 121 | continue; |
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| 122 | } else if (c == '[') { |
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| 123 | int result; |
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| 124 | |
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| 125 | pvPtr->next = dst; |
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| 126 | result = TclParseNestedCmd(interp, src, flags, termPtr, pvPtr); |
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| 127 | if (result != TCL_OK) { |
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| 128 | return result; |
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| 129 | } |
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| 130 | src = *termPtr; |
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| 131 | dst = pvPtr->next; |
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| 132 | continue; |
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| 133 | } else if (c == '\\') { |
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| 134 | int numRead; |
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| 135 | |
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| 136 | src--; |
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| 137 | *dst = Tcl_Backslash(src, &numRead); |
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| 138 | dst++; |
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| 139 | src += numRead; |
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| 140 | continue; |
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| 141 | } else if (c == '\0') { |
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| 142 | char buf[30]; |
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| 143 | |
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| 144 | Tcl_ResetResult(interp); |
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| 145 | sprintf(buf, "missing %c", termChar); |
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| 146 | Tcl_SetResult(interp, buf, TCL_VOLATILE); |
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| 147 | *termPtr = string-1; |
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| 148 | return TCL_ERROR; |
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| 149 | } else { |
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| 150 | goto copy; |
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| 151 | } |
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| 152 | } |
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| 153 | } |
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| 154 | |
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| 155 | /* |
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| 156 | *-------------------------------------------------------------- |
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| 157 | * |
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| 158 | * TclParseNestedCmd -- |
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| 159 | * |
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| 160 | * This procedure parses a nested Tcl command between |
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| 161 | * brackets, returning the result of the command. |
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| 162 | * |
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| 163 | * Results: |
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| 164 | * The return value is a standard Tcl result, which is |
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| 165 | * TCL_OK unless there was an error while executing the |
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| 166 | * nested command. If an error occurs then interp->result |
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| 167 | * contains a standard error message. *TermPtr is filled |
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| 168 | * in with the address of the character just after the |
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| 169 | * last one processed; this is usually the character just |
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| 170 | * after the matching close-bracket, or the null character |
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| 171 | * at the end of the string if the close-bracket was missing |
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| 172 | * (a missing close bracket is an error). The result returned |
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| 173 | * by the command is stored in standard fashion in *pvPtr, |
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| 174 | * null-terminated, with pvPtr->next pointing to the null |
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| 175 | * character. |
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| 176 | * |
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| 177 | * Side effects: |
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| 178 | * The storage space at *pvPtr may be expanded. |
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| 179 | * |
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| 180 | *-------------------------------------------------------------- |
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| 181 | */ |
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| 182 | |
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| 183 | int |
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| 184 | TclParseNestedCmd(interp, string, flags, termPtr, pvPtr) |
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| 185 | Tcl_Interp *interp; /* Interpreter to use for nested command |
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| 186 | * evaluations and error messages. */ |
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| 187 | char *string; /* Character just after opening bracket. */ |
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| 188 | int flags; /* Flags to pass to nested Tcl_Eval. */ |
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| 189 | char **termPtr; /* Store address of terminating character |
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| 190 | * here. */ |
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| 191 | register ParseValue *pvPtr; /* Information about where to place |
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| 192 | * result of command. */ |
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| 193 | { |
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| 194 | int result, length, shortfall; |
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| 195 | Interp *iPtr = (Interp *) interp; |
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| 196 | |
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| 197 | iPtr->evalFlags = flags | TCL_BRACKET_TERM; |
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| 198 | result = Tcl_Eval(interp, string); |
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| 199 | *termPtr = (string + iPtr->termOffset); |
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| 200 | if (result != TCL_OK) { |
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| 201 | /* |
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| 202 | * The increment below results in slightly cleaner message in |
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| 203 | * the errorInfo variable (the close-bracket will appear). |
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| 204 | */ |
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| 205 | |
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| 206 | if (**termPtr == ']') { |
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| 207 | *termPtr += 1; |
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| 208 | } |
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| 209 | return result; |
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| 210 | } |
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| 211 | (*termPtr) += 1; |
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| 212 | length = strlen(iPtr->result); |
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| 213 | shortfall = length + 1 - (pvPtr->end - pvPtr->next); |
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| 214 | if (shortfall > 0) { |
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| 215 | (*pvPtr->expandProc)(pvPtr, shortfall); |
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| 216 | } |
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| 217 | strcpy(pvPtr->next, iPtr->result); |
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| 218 | pvPtr->next += length; |
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| 219 | |
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| 220 | Tcl_FreeResult(interp); |
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| 221 | iPtr->result = iPtr->resultSpace; |
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| 222 | iPtr->resultSpace[0] = '\0'; |
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| 223 | return TCL_OK; |
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| 224 | } |
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| 225 | |
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| 226 | /* |
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| 227 | *-------------------------------------------------------------- |
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| 228 | * |
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| 229 | * TclParseBraces -- |
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| 230 | * |
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| 231 | * This procedure scans the information between matching |
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| 232 | * curly braces. |
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| 233 | * |
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| 234 | * Results: |
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| 235 | * The return value is a standard Tcl result, which is |
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| 236 | * TCL_OK unless there was an error while parsing string. |
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| 237 | * If an error occurs then interp->result contains a |
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| 238 | * standard error message. *TermPtr is filled |
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| 239 | * in with the address of the character just after the |
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| 240 | * last one successfully processed; this is usually the |
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| 241 | * character just after the matching close-brace. The |
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| 242 | * information between curly braces is stored in standard |
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| 243 | * fashion in *pvPtr, null-terminated with pvPtr->next |
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| 244 | * pointing to the terminating null character. |
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| 245 | * |
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| 246 | * Side effects: |
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| 247 | * The storage space at *pvPtr may be expanded. |
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| 248 | * |
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| 249 | *-------------------------------------------------------------- |
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| 250 | */ |
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| 251 | |
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| 252 | int |
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| 253 | TclParseBraces(interp, string, termPtr, pvPtr) |
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| 254 | Tcl_Interp *interp; /* Interpreter to use for nested command |
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| 255 | * evaluations and error messages. */ |
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| 256 | char *string; /* Character just after opening bracket. */ |
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| 257 | char **termPtr; /* Store address of terminating character |
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| 258 | * here. */ |
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| 259 | register ParseValue *pvPtr; /* Information about where to place |
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| 260 | * result of command. */ |
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| 261 | { |
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| 262 | int level; |
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| 263 | register char *src, *dst, *end; |
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| 264 | register char c; |
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| 265 | char *lastChar = string + strlen(string); |
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| 266 | |
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| 267 | src = string; |
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| 268 | dst = pvPtr->next; |
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| 269 | end = pvPtr->end; |
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| 270 | level = 1; |
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| 271 | |
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| 272 | /* |
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| 273 | * Copy the characters one at a time to the result area, stopping |
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| 274 | * when the matching close-brace is found. |
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| 275 | */ |
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| 276 | |
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| 277 | while (1) { |
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| 278 | c = *src; |
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| 279 | src++; |
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| 280 | if (dst == end) { |
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| 281 | pvPtr->next = dst; |
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| 282 | (*pvPtr->expandProc)(pvPtr, 20); |
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| 283 | dst = pvPtr->next; |
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| 284 | end = pvPtr->end; |
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| 285 | } |
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| 286 | *dst = c; |
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| 287 | dst++; |
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| 288 | if (CHAR_TYPE(src-1, lastChar) == TCL_NORMAL) { |
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| 289 | continue; |
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| 290 | } else if (c == '{') { |
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| 291 | level++; |
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| 292 | } else if (c == '}') { |
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| 293 | level--; |
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| 294 | if (level == 0) { |
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| 295 | dst--; /* Don't copy the last close brace. */ |
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| 296 | break; |
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| 297 | } |
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| 298 | } else if (c == '\\') { |
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| 299 | int count; |
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| 300 | |
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| 301 | /* |
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| 302 | * Must always squish out backslash-newlines, even when in |
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| 303 | * braces. This is needed so that this sequence can appear |
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| 304 | * anywhere in a command, such as the middle of an expression. |
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| 305 | */ |
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| 306 | |
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| 307 | if (*src == '\n') { |
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| 308 | dst[-1] = Tcl_Backslash(src-1, &count); |
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| 309 | src += count - 1; |
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| 310 | } else { |
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| 311 | (void) Tcl_Backslash(src-1, &count); |
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| 312 | while (count > 1) { |
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| 313 | if (dst == end) { |
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| 314 | pvPtr->next = dst; |
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| 315 | (*pvPtr->expandProc)(pvPtr, 20); |
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| 316 | dst = pvPtr->next; |
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| 317 | end = pvPtr->end; |
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| 318 | } |
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| 319 | *dst = *src; |
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| 320 | dst++; |
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| 321 | src++; |
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| 322 | count--; |
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| 323 | } |
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| 324 | } |
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| 325 | } else if (c == '\0') { |
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| 326 | Tcl_SetResult(interp, "missing close-brace", TCL_STATIC); |
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| 327 | *termPtr = string-1; |
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| 328 | return TCL_ERROR; |
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| 329 | } |
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| 330 | } |
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| 331 | |
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| 332 | *dst = '\0'; |
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| 333 | pvPtr->next = dst; |
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| 334 | *termPtr = src; |
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| 335 | return TCL_OK; |
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| 336 | } |
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| 337 | |
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| 338 | /* |
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| 339 | *-------------------------------------------------------------- |
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| 340 | * |
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| 341 | * TclExpandParseValue -- |
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| 342 | * |
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| 343 | * This procedure is commonly used as the value of the |
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| 344 | * expandProc in a ParseValue. It uses malloc to allocate |
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| 345 | * more space for the result of a parse. |
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| 346 | * |
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| 347 | * Results: |
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| 348 | * The buffer space in *pvPtr is reallocated to something |
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| 349 | * larger, and if pvPtr->clientData is non-zero the old |
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| 350 | * buffer is freed. Information is copied from the old |
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| 351 | * buffer to the new one. |
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| 352 | * |
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| 353 | * Side effects: |
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| 354 | * None. |
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| 355 | * |
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| 356 | *-------------------------------------------------------------- |
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| 357 | */ |
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| 358 | |
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| 359 | void |
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| 360 | TclExpandParseValue(pvPtr, needed) |
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| 361 | register ParseValue *pvPtr; /* Information about buffer that |
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| 362 | * must be expanded. If the clientData |
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| 363 | * in the structure is non-zero, it |
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| 364 | * means that the current buffer is |
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| 365 | * dynamically allocated. */ |
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| 366 | int needed; /* Minimum amount of additional space |
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| 367 | * to allocate. */ |
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| 368 | { |
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| 369 | int newSpace; |
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| 370 | char *new; |
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| 371 | |
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| 372 | /* |
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| 373 | * Either double the size of the buffer or add enough new space |
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| 374 | * to meet the demand, whichever produces a larger new buffer. |
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| 375 | */ |
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| 376 | |
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| 377 | newSpace = (pvPtr->end - pvPtr->buffer) + 1; |
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| 378 | if (newSpace < needed) { |
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| 379 | newSpace += needed; |
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| 380 | } else { |
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| 381 | newSpace += newSpace; |
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| 382 | } |
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| 383 | new = (char *) ckalloc((unsigned) newSpace); |
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| 384 | |
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| 385 | /* |
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| 386 | * Copy from old buffer to new, free old buffer if needed, and |
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| 387 | * mark new buffer as malloc-ed. |
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| 388 | */ |
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| 389 | |
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| 390 | memcpy((VOID *) new, (VOID *) pvPtr->buffer, |
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| 391 | (size_t) (pvPtr->next - pvPtr->buffer)); |
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| 392 | pvPtr->next = new + (pvPtr->next - pvPtr->buffer); |
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| 393 | if (pvPtr->clientData != 0) { |
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| 394 | ckfree(pvPtr->buffer); |
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| 395 | } |
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| 396 | pvPtr->buffer = new; |
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| 397 | pvPtr->end = new + newSpace - 1; |
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| 398 | pvPtr->clientData = (ClientData) 1; |
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| 399 | } |
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| 400 | |
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| 401 | /* |
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| 402 | *---------------------------------------------------------------------- |
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| 403 | * |
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| 404 | * TclWordEnd -- |
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| 405 | * |
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| 406 | * Given a pointer into a Tcl command, find the end of the next |
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| 407 | * word of the command. |
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| 408 | * |
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| 409 | * Results: |
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| 410 | * The return value is a pointer to the last character that's part |
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| 411 | * of the word pointed to by "start". If the word doesn't end |
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| 412 | * properly within the string then the return value is the address |
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| 413 | * of the null character at the end of the string. |
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| 414 | * |
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| 415 | * Side effects: |
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| 416 | * None. |
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| 417 | * |
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| 418 | *---------------------------------------------------------------------- |
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| 419 | */ |
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| 420 | |
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| 421 | char * |
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| 422 | TclWordEnd(start, lastChar, nested, semiPtr) |
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| 423 | char *start; /* Beginning of a word of a Tcl command. */ |
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| 424 | char *lastChar; /* Terminating character in string. */ |
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| 425 | int nested; /* Zero means this is a top-level command. |
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| 426 | * One means this is a nested command (close |
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| 427 | * bracket is a word terminator). */ |
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| 428 | int *semiPtr; /* Set to 1 if word ends with a command- |
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| 429 | * terminating semi-colon, zero otherwise. |
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| 430 | * If NULL then ignored. */ |
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| 431 | { |
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| 432 | register char *p; |
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| 433 | int count; |
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| 434 | |
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| 435 | if (semiPtr != NULL) { |
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| 436 | *semiPtr = 0; |
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| 437 | } |
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| 438 | |
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| 439 | /* |
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| 440 | * Skip leading white space (backslash-newline must be treated like |
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| 441 | * white-space, except that it better not be the last thing in the |
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| 442 | * command). |
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| 443 | */ |
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| 444 | |
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| 445 | for (p = start; ; p++) { |
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| 446 | if (isspace(UCHAR(*p))) { |
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| 447 | continue; |
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| 448 | } |
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| 449 | if ((p[0] == '\\') && (p[1] == '\n')) { |
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| 450 | if (p+2 == lastChar) { |
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| 451 | return p+2; |
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| 452 | } |
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| 453 | continue; |
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| 454 | } |
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| 455 | break; |
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| 456 | } |
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| 457 | |
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| 458 | /* |
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| 459 | * Handle words beginning with a double-quote or a brace. |
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| 460 | */ |
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| 461 | |
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| 462 | if (*p == '"') { |
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| 463 | p = QuoteEnd(p+1, lastChar, '"'); |
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| 464 | if (p == lastChar) { |
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| 465 | return p; |
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| 466 | } |
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| 467 | p++; |
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| 468 | } else if (*p == '{') { |
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| 469 | int braces = 1; |
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| 470 | while (braces != 0) { |
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| 471 | p++; |
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| 472 | while (*p == '\\') { |
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| 473 | (void) Tcl_Backslash(p, &count); |
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| 474 | p += count; |
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| 475 | } |
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| 476 | if (*p == '}') { |
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| 477 | braces--; |
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| 478 | } else if (*p == '{') { |
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| 479 | braces++; |
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| 480 | } else if (p == lastChar) { |
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| 481 | return p; |
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| 482 | } |
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| 483 | } |
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| 484 | p++; |
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| 485 | } |
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| 486 | |
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| 487 | /* |
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| 488 | * Handle words that don't start with a brace or double-quote. |
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| 489 | * This code is also invoked if the word starts with a brace or |
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| 490 | * double-quote and there is garbage after the closing brace or |
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| 491 | * quote. This is an error as far as Tcl_Eval is concerned, but |
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| 492 | * for here the garbage is treated as part of the word. |
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| 493 | */ |
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| 494 | |
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| 495 | while (1) { |
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| 496 | if (*p == '[') { |
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| 497 | p = ScriptEnd(p+1, lastChar, 1); |
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| 498 | if (p == lastChar) { |
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| 499 | return p; |
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| 500 | } |
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| 501 | p++; |
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| 502 | } else if (*p == '\\') { |
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| 503 | if (p[1] == '\n') { |
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| 504 | /* |
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| 505 | * Backslash-newline: it maps to a space character |
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| 506 | * that is a word separator, so the word ends just before |
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| 507 | * the backslash. |
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| 508 | */ |
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| 509 | |
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| 510 | return p-1; |
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| 511 | } |
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| 512 | (void) Tcl_Backslash(p, &count); |
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| 513 | p += count; |
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| 514 | } else if (*p == '$') { |
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| 515 | p = VarNameEnd(p, lastChar); |
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| 516 | if (p == lastChar) { |
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| 517 | return p; |
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| 518 | } |
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| 519 | p++; |
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| 520 | } else if (*p == ';') { |
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| 521 | /* |
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| 522 | * Include the semi-colon in the word that is returned. |
---|
| 523 | */ |
---|
| 524 | |
---|
| 525 | if (semiPtr != NULL) { |
---|
| 526 | *semiPtr = 1; |
---|
| 527 | } |
---|
| 528 | return p; |
---|
| 529 | } else if (isspace(UCHAR(*p))) { |
---|
| 530 | return p-1; |
---|
| 531 | } else if ((*p == ']') && nested) { |
---|
| 532 | return p-1; |
---|
| 533 | } else if (p == lastChar) { |
---|
| 534 | if (nested) { |
---|
| 535 | /* |
---|
| 536 | * Nested commands can't end because of the end of the |
---|
| 537 | * string. |
---|
| 538 | */ |
---|
| 539 | return p; |
---|
| 540 | } |
---|
| 541 | return p-1; |
---|
| 542 | } else { |
---|
| 543 | p++; |
---|
| 544 | } |
---|
| 545 | } |
---|
| 546 | } |
---|
| 547 | |
---|
| 548 | /* |
---|
| 549 | *---------------------------------------------------------------------- |
---|
| 550 | * |
---|
| 551 | * QuoteEnd -- |
---|
| 552 | * |
---|
| 553 | * Given a pointer to a string that obeys the parsing conventions |
---|
| 554 | * for quoted things in Tcl, find the end of that quoted thing. |
---|
| 555 | * The actual thing may be a quoted argument or a parenthesized |
---|
| 556 | * index name. |
---|
| 557 | * |
---|
| 558 | * Results: |
---|
| 559 | * The return value is a pointer to the last character that is |
---|
| 560 | * part of the quoted string (i.e the character that's equal to |
---|
| 561 | * term). If the quoted string doesn't terminate properly then |
---|
| 562 | * the return value is a pointer to the null character at the |
---|
| 563 | * end of the string. |
---|
| 564 | * |
---|
| 565 | * Side effects: |
---|
| 566 | * None. |
---|
| 567 | * |
---|
| 568 | *---------------------------------------------------------------------- |
---|
| 569 | */ |
---|
| 570 | |
---|
| 571 | static char * |
---|
| 572 | QuoteEnd(string, lastChar, term) |
---|
| 573 | char *string; /* Pointer to character just after opening |
---|
| 574 | * "quote". */ |
---|
| 575 | char *lastChar; /* Terminating character in string. */ |
---|
| 576 | int term; /* This character will terminate the |
---|
| 577 | * quoted string (e.g. '"' or ')'). */ |
---|
| 578 | { |
---|
| 579 | register char *p = string; |
---|
| 580 | int count; |
---|
| 581 | |
---|
| 582 | while (*p != term) { |
---|
| 583 | if (*p == '\\') { |
---|
| 584 | (void) Tcl_Backslash(p, &count); |
---|
| 585 | p += count; |
---|
| 586 | } else if (*p == '[') { |
---|
| 587 | for (p++; *p != ']'; p++) { |
---|
| 588 | p = TclWordEnd(p, lastChar, 1, (int *) NULL); |
---|
| 589 | if (*p == 0) { |
---|
| 590 | return p; |
---|
| 591 | } |
---|
| 592 | } |
---|
| 593 | p++; |
---|
| 594 | } else if (*p == '$') { |
---|
| 595 | p = VarNameEnd(p, lastChar); |
---|
| 596 | if (*p == 0) { |
---|
| 597 | return p; |
---|
| 598 | } |
---|
| 599 | p++; |
---|
| 600 | } else if (p == lastChar) { |
---|
| 601 | return p; |
---|
| 602 | } else { |
---|
| 603 | p++; |
---|
| 604 | } |
---|
| 605 | } |
---|
| 606 | return p-1; |
---|
| 607 | } |
---|
| 608 | |
---|
| 609 | /* |
---|
| 610 | *---------------------------------------------------------------------- |
---|
| 611 | * |
---|
| 612 | * VarNameEnd -- |
---|
| 613 | * |
---|
| 614 | * Given a pointer to a variable reference using $-notation, find |
---|
| 615 | * the end of the variable name spec. |
---|
| 616 | * |
---|
| 617 | * Results: |
---|
| 618 | * The return value is a pointer to the last character that |
---|
| 619 | * is part of the variable name. If the variable name doesn't |
---|
| 620 | * terminate properly then the return value is a pointer to the |
---|
| 621 | * null character at the end of the string. |
---|
| 622 | * |
---|
| 623 | * Side effects: |
---|
| 624 | * None. |
---|
| 625 | * |
---|
| 626 | *---------------------------------------------------------------------- |
---|
| 627 | */ |
---|
| 628 | |
---|
| 629 | static char * |
---|
| 630 | VarNameEnd(string, lastChar) |
---|
| 631 | char *string; /* Pointer to dollar-sign character. */ |
---|
| 632 | char *lastChar; /* Terminating character in string. */ |
---|
| 633 | { |
---|
| 634 | register char *p = string+1; |
---|
| 635 | |
---|
| 636 | if (*p == '{') { |
---|
| 637 | for (p++; (*p != '}') && (p != lastChar); p++) { |
---|
| 638 | /* Empty loop body. */ |
---|
| 639 | } |
---|
| 640 | return p; |
---|
| 641 | } |
---|
| 642 | while (isalnum(UCHAR(*p)) || (*p == '_')) { |
---|
| 643 | p++; |
---|
| 644 | } |
---|
| 645 | if ((*p == '(') && (p != string+1)) { |
---|
| 646 | return QuoteEnd(p+1, lastChar, ')'); |
---|
| 647 | } |
---|
| 648 | return p-1; |
---|
| 649 | } |
---|
| 650 | |
---|
| 651 | |
---|
| 652 | /* |
---|
| 653 | *---------------------------------------------------------------------- |
---|
| 654 | * |
---|
| 655 | * ScriptEnd -- |
---|
| 656 | * |
---|
| 657 | * Given a pointer to the beginning of a Tcl script, find the end of |
---|
| 658 | * the script. |
---|
| 659 | * |
---|
| 660 | * Results: |
---|
| 661 | * The return value is a pointer to the last character that's part |
---|
| 662 | * of the script pointed to by "p". If the command doesn't end |
---|
| 663 | * properly within the string then the return value is the address |
---|
| 664 | * of the null character at the end of the string. |
---|
| 665 | * |
---|
| 666 | * Side effects: |
---|
| 667 | * None. |
---|
| 668 | * |
---|
| 669 | *---------------------------------------------------------------------- |
---|
| 670 | */ |
---|
| 671 | |
---|
| 672 | static char * |
---|
| 673 | ScriptEnd(p, lastChar, nested) |
---|
| 674 | char *p; /* Script to check. */ |
---|
| 675 | char *lastChar; /* Terminating character in string. */ |
---|
| 676 | int nested; /* Zero means this is a top-level command. |
---|
| 677 | * One means this is a nested command (the |
---|
| 678 | * last character of the script must be |
---|
| 679 | * an unquoted ]). */ |
---|
| 680 | { |
---|
| 681 | int commentOK = 1; |
---|
| 682 | int length; |
---|
| 683 | |
---|
| 684 | while (1) { |
---|
| 685 | while (isspace(UCHAR(*p))) { |
---|
| 686 | if (*p == '\n') { |
---|
| 687 | commentOK = 1; |
---|
| 688 | } |
---|
| 689 | p++; |
---|
| 690 | } |
---|
| 691 | if ((*p == '#') && commentOK) { |
---|
| 692 | do { |
---|
| 693 | if (*p == '\\') { |
---|
| 694 | /* |
---|
| 695 | * If the script ends with backslash-newline, then |
---|
| 696 | * this command isn't complete. |
---|
| 697 | */ |
---|
| 698 | |
---|
| 699 | if ((p[1] == '\n') && (p+2 == lastChar)) { |
---|
| 700 | return p+2; |
---|
| 701 | } |
---|
| 702 | Tcl_Backslash(p, &length); |
---|
| 703 | p += length; |
---|
| 704 | } else { |
---|
| 705 | p++; |
---|
| 706 | } |
---|
| 707 | } while ((p != lastChar) && (*p != '\n')); |
---|
| 708 | continue; |
---|
| 709 | } |
---|
| 710 | p = TclWordEnd(p, lastChar, nested, &commentOK); |
---|
| 711 | if (p == lastChar) { |
---|
| 712 | return p; |
---|
| 713 | } |
---|
| 714 | p++; |
---|
| 715 | if (nested) { |
---|
| 716 | if (*p == ']') { |
---|
| 717 | return p; |
---|
| 718 | } |
---|
| 719 | } else { |
---|
| 720 | if (p == lastChar) { |
---|
| 721 | return p-1; |
---|
| 722 | } |
---|
| 723 | } |
---|
| 724 | } |
---|
| 725 | } |
---|
| 726 | |
---|
| 727 | /* |
---|
| 728 | *---------------------------------------------------------------------- |
---|
| 729 | * |
---|
| 730 | * Tcl_ParseVar -- |
---|
| 731 | * |
---|
| 732 | * Given a string starting with a $ sign, parse off a variable |
---|
| 733 | * name and return its value. |
---|
| 734 | * |
---|
| 735 | * Results: |
---|
| 736 | * The return value is the contents of the variable given by |
---|
| 737 | * the leading characters of string. If termPtr isn't NULL, |
---|
| 738 | * *termPtr gets filled in with the address of the character |
---|
| 739 | * just after the last one in the variable specifier. If the |
---|
| 740 | * variable doesn't exist, then the return value is NULL and |
---|
| 741 | * an error message will be left in interp->result. |
---|
| 742 | * |
---|
| 743 | * Side effects: |
---|
| 744 | * None. |
---|
| 745 | * |
---|
| 746 | *---------------------------------------------------------------------- |
---|
| 747 | */ |
---|
| 748 | |
---|
| 749 | char * |
---|
| 750 | Tcl_ParseVar(interp, string, termPtr) |
---|
| 751 | Tcl_Interp *interp; /* Context for looking up variable. */ |
---|
| 752 | register char *string; /* String containing variable name. |
---|
| 753 | * First character must be "$". */ |
---|
| 754 | char **termPtr; /* If non-NULL, points to word to fill |
---|
| 755 | * in with character just after last |
---|
| 756 | * one in the variable specifier. */ |
---|
| 757 | |
---|
| 758 | { |
---|
| 759 | char *name1, *name1End, c, *result; |
---|
| 760 | register char *name2; |
---|
| 761 | #define NUM_CHARS 200 |
---|
| 762 | char copyStorage[NUM_CHARS]; |
---|
| 763 | ParseValue pv; |
---|
| 764 | |
---|
| 765 | /* |
---|
| 766 | * There are three cases: |
---|
| 767 | * 1. The $ sign is followed by an open curly brace. Then the variable |
---|
| 768 | * name is everything up to the next close curly brace, and the |
---|
| 769 | * variable is a scalar variable. |
---|
| 770 | * 2. The $ sign is not followed by an open curly brace. Then the |
---|
| 771 | * variable name is everything up to the next character that isn't |
---|
| 772 | * a letter, digit, or underscore, or a "::" namespace separator. |
---|
| 773 | * If the following character is an open parenthesis, then the |
---|
| 774 | * information between parentheses is the array element name, which |
---|
| 775 | * can include any of the substitutions permissible between quotes. |
---|
| 776 | * 3. The $ sign is followed by something that isn't a letter, digit, |
---|
| 777 | * underscore, or a "::" namespace separator: in this case, |
---|
| 778 | * there is no variable name, and "$" is returned. |
---|
| 779 | */ |
---|
| 780 | |
---|
| 781 | name2 = NULL; |
---|
| 782 | string++; |
---|
| 783 | if (*string == '{') { |
---|
| 784 | string++; |
---|
| 785 | name1 = string; |
---|
| 786 | while (*string != '}') { |
---|
| 787 | if (*string == 0) { |
---|
| 788 | Tcl_SetResult(interp, "missing close-brace for variable name", |
---|
| 789 | TCL_STATIC); |
---|
| 790 | if (termPtr != 0) { |
---|
| 791 | *termPtr = string; |
---|
| 792 | } |
---|
| 793 | return NULL; |
---|
| 794 | } |
---|
| 795 | string++; |
---|
| 796 | } |
---|
| 797 | name1End = string; |
---|
| 798 | string++; |
---|
| 799 | } else { |
---|
| 800 | name1 = string; |
---|
| 801 | while (isalnum(UCHAR(*string)) || (*string == '_') |
---|
| 802 | || (*string == ':')) { |
---|
| 803 | if (*string == ':') { |
---|
| 804 | if (*(string+1) == ':') { |
---|
| 805 | string += 2; /* skip over the initial :: */ |
---|
| 806 | while (*string == ':') { |
---|
| 807 | string++; /* skip over a subsequent : */ |
---|
| 808 | } |
---|
| 809 | } else { |
---|
| 810 | break; /* : by itself */ |
---|
| 811 | } |
---|
| 812 | } else { |
---|
| 813 | string++; |
---|
| 814 | } |
---|
| 815 | } |
---|
| 816 | if (string == name1) { |
---|
| 817 | if (termPtr != 0) { |
---|
| 818 | *termPtr = string; |
---|
| 819 | } |
---|
| 820 | return "$"; |
---|
| 821 | } |
---|
| 822 | name1End = string; |
---|
| 823 | if (*string == '(') { |
---|
| 824 | char *end; |
---|
| 825 | |
---|
| 826 | /* |
---|
| 827 | * Perform substitutions on the array element name, just as |
---|
| 828 | * is done for quotes. |
---|
| 829 | */ |
---|
| 830 | |
---|
| 831 | pv.buffer = pv.next = copyStorage; |
---|
| 832 | pv.end = copyStorage + NUM_CHARS - 1; |
---|
| 833 | pv.expandProc = TclExpandParseValue; |
---|
| 834 | pv.clientData = (ClientData) NULL; |
---|
| 835 | if (TclParseQuotes(interp, string+1, ')', 0, &end, &pv) |
---|
| 836 | != TCL_OK) { |
---|
| 837 | char msg[200]; |
---|
| 838 | int length; |
---|
| 839 | |
---|
| 840 | length = string-name1; |
---|
| 841 | if (length > 100) { |
---|
| 842 | length = 100; |
---|
| 843 | } |
---|
| 844 | sprintf(msg, "\n (parsing index for array \"%.*s\")", |
---|
| 845 | length, name1); |
---|
| 846 | Tcl_AddErrorInfo(interp, msg); |
---|
| 847 | result = NULL; |
---|
| 848 | name2 = pv.buffer; |
---|
| 849 | if (termPtr != 0) { |
---|
| 850 | *termPtr = end; |
---|
| 851 | } |
---|
| 852 | goto done; |
---|
| 853 | } |
---|
| 854 | Tcl_ResetResult(interp); |
---|
| 855 | string = end; |
---|
| 856 | name2 = pv.buffer; |
---|
| 857 | } |
---|
| 858 | } |
---|
| 859 | if (termPtr != 0) { |
---|
| 860 | *termPtr = string; |
---|
| 861 | } |
---|
| 862 | |
---|
| 863 | c = *name1End; |
---|
| 864 | *name1End = 0; |
---|
| 865 | result = Tcl_GetVar2(interp, name1, name2, TCL_LEAVE_ERR_MSG); |
---|
| 866 | *name1End = c; |
---|
| 867 | |
---|
| 868 | done: |
---|
| 869 | if ((name2 != NULL) && (pv.buffer != copyStorage)) { |
---|
| 870 | ckfree(pv.buffer); |
---|
| 871 | } |
---|
| 872 | return result; |
---|
| 873 | } |
---|
| 874 | |
---|
| 875 | /* |
---|
| 876 | *---------------------------------------------------------------------- |
---|
| 877 | * |
---|
| 878 | * Tcl_CommandComplete -- |
---|
| 879 | * |
---|
| 880 | * Given a partial or complete Tcl command, this procedure |
---|
| 881 | * determines whether the command is complete in the sense |
---|
| 882 | * of having matched braces and quotes and brackets. |
---|
| 883 | * |
---|
| 884 | * Results: |
---|
| 885 | * 1 is returned if the command is complete, 0 otherwise. |
---|
| 886 | * |
---|
| 887 | * Side effects: |
---|
| 888 | * None. |
---|
| 889 | * |
---|
| 890 | *---------------------------------------------------------------------- |
---|
| 891 | */ |
---|
| 892 | |
---|
| 893 | int |
---|
| 894 | Tcl_CommandComplete(cmd) |
---|
| 895 | char *cmd; /* Command to check. */ |
---|
| 896 | { |
---|
| 897 | char *p; |
---|
| 898 | |
---|
| 899 | if (*cmd == 0) { |
---|
| 900 | return 1; |
---|
| 901 | } |
---|
| 902 | p = ScriptEnd(cmd, cmd+strlen(cmd), 0); |
---|
| 903 | return (*p != 0); |
---|
| 904 | } |
---|
| 905 | |
---|
| 906 | /* |
---|
| 907 | *---------------------------------------------------------------------- |
---|
| 908 | * |
---|
| 909 | * TclObjCommandComplete -- |
---|
| 910 | * |
---|
| 911 | * Given a partial or complete Tcl command in a Tcl object, this |
---|
| 912 | * procedure determines whether the command is complete in the sense of |
---|
| 913 | * having matched braces and quotes and brackets. |
---|
| 914 | * |
---|
| 915 | * Results: |
---|
| 916 | * 1 is returned if the command is complete, 0 otherwise. |
---|
| 917 | * |
---|
| 918 | * Side effects: |
---|
| 919 | * None. |
---|
| 920 | * |
---|
| 921 | *---------------------------------------------------------------------- |
---|
| 922 | */ |
---|
| 923 | |
---|
| 924 | int |
---|
| 925 | TclObjCommandComplete(cmdPtr) |
---|
| 926 | Tcl_Obj *cmdPtr; /* Points to object holding command |
---|
| 927 | * to check. */ |
---|
| 928 | { |
---|
| 929 | char *cmd, *p; |
---|
| 930 | int length; |
---|
| 931 | |
---|
| 932 | cmd = Tcl_GetStringFromObj(cmdPtr, &length); |
---|
| 933 | if (length == 0) { |
---|
| 934 | return 1; |
---|
| 935 | } |
---|
| 936 | p = ScriptEnd(cmd, cmd+length, /*nested*/ 0); |
---|
| 937 | return (*p != 0); |
---|
| 938 | } |
---|