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| /*
** Copyright (c) 2011 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
** This program is distributed in the hope that it will be useful,
** but without any warranty; without even the implied warranty of
** merchantability or fitness for a particular purpose.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains code used to pattern matching using "glob" syntax.
*/
#include "config.h"
#include "glob.h"
#include <assert.h>
/*
** Construct and return a string which is an SQL expression that will
** be TRUE if value zVal matches any of the GLOB expressions in the list
** zGlobList. For example:
**
** zVal: "x"
** zGlobList: "*.o,*.obj"
**
** Result: "(x GLOB '*.o' OR x GLOB '*.obj')"
**
** Commas and whitespace are considered to be element delimters. Each
** element of the GLOB list may optionally be enclosed in either '...' or
** "...". This allows commas and/or whitespace to be used in the elements
** themselves.
**
** This routine makes no effort to free the memory space it uses, which
** currently consists of a blob object and its contents.
*/
char *glob_expr(const char *zVal, const char *zGlobList){
Blob expr;
const char *zSep = "(";
int nTerm = 0;
int i;
int cTerm;
if( zGlobList==0 || zGlobList[0]==0 ) return fossil_strdup("0");
blob_zero(&expr);
while( zGlobList[0] ){
while( fossil_isspace(zGlobList[0]) || zGlobList[0]==',' ){
zGlobList++; /* Skip leading commas, spaces, and newlines */
}
if( zGlobList[0]==0 ) break;
if( zGlobList[0]=='\'' || zGlobList[0]=='"' ){
cTerm = zGlobList[0];
zGlobList++;
}else{
cTerm = ',';
}
/* Find the next delimter (or the end of the string). */
for(i=0; zGlobList[i] && zGlobList[i]!=cTerm; i++){
if( cTerm!=',' ) continue; /* If quoted, keep going. */
if( fossil_isspace(zGlobList[i]) ) break; /* If space, stop. */
}
blob_appendf(&expr, "%s%s GLOB '%#q'", zSep, zVal, i, zGlobList);
zSep = " OR ";
if( cTerm!=',' && zGlobList[i] ) i++;
zGlobList += i;
if( zGlobList[0] ) zGlobList++;
nTerm++;
}
if( nTerm ){
blob_appendf(&expr, ")");
return blob_str(&expr);
}else{
return fossil_strdup("0");
}
}
#if INTERFACE
/*
** A Glob object holds a set of patterns read to be matched against
** a string.
*/
struct Glob {
int nPattern; /* Number of patterns */
char **azPattern; /* Array of pointers to patterns */
};
#endif /* INTERFACE */
/*
** zPatternList is a comma-separated list of glob patterns. Parse up
** that list and use it to create a new Glob object.
**
** Elements of the glob list may be optionally enclosed in single our
** double-quotes. This allows a comma to be part of a glob pattern.
**
** Leading and trailing spaces on unquoted glob patterns are ignored.
**
** An empty or null pattern list results in a null glob, which will
** match nothing.
*/
Glob *glob_create(const char *zPatternList){
int nList; /* Size of zPatternList in bytes */
int i; /* Loop counters */
Glob *p; /* The glob being created */
char *z; /* Copy of the pattern list */
char delimiter; /* '\'' or '\"' or 0 */
if( zPatternList==0 || zPatternList[0]==0 ) return 0;
nList = strlen(zPatternList);
p = fossil_malloc( sizeof(*p) + nList+1 );
memset(p, 0, sizeof(*p));
z = (char*)&p[1];
memcpy(z, zPatternList, nList+1);
while( z[0] ){
while( fossil_isspace(z[0]) || z[0]==',' ){
z++; /* Skip leading commas, spaces, and newlines */
}
if( z[0]==0 ) break;
if( z[0]=='\'' || z[0]=='"' ){
delimiter = z[0];
z++;
}else{
delimiter = ',';
}
p->azPattern = fossil_realloc(p->azPattern, (p->nPattern+1)*sizeof(char*) );
p->azPattern[p->nPattern++] = z;
/* Find the next delimter (or the end of the string). */
for(i=0; z[i] && z[i]!=delimiter; i++){
if( delimiter!=',' ) continue; /* If quoted, keep going. */
if( fossil_isspace(z[i]) ) break; /* If space, stop. */
}
if( z[i]==0 ) break;
z[i] = 0;
z += i+1;
}
return p;
}
/*
** Return true (non-zero) if zString matches any of the patterns in
** the Glob. The value returned is actually a 1-based index of the pattern
** that matched. Return 0 if none of the patterns match zString.
**
** A NULL glob matches nothing.
*/
int glob_match(Glob *pGlob, const char *zString){
int i;
if( pGlob==0 ) return 0;
for(i=0; i<pGlob->nPattern; i++){
if( sqlite3_strglob(pGlob->azPattern[i], zString)==0 ) return i+1;
}
return 0;
}
/*
** Free all memory associated with the given Glob object
*/
void glob_free(Glob *pGlob){
if( pGlob ){
fossil_free(pGlob->azPattern);
fossil_free(pGlob);
}
}
/*
** Appends the given glob to the given buffer in the form of a
** JS/JSON-compatible array. It requires that pDest have been
** initialized. If pGlob is NULL or empty it emits [] (an empty
** array).
*/
void glob_render_json_to_blob(Glob *pGlob, Blob *pDest){
int i = 0;
blob_append(pDest, "[", 1);
for( ; pGlob && i < pGlob->nPattern; ++i ){
if(i){
blob_append(pDest, ",", 1);
}
blob_appendf(pDest, "%!j", pGlob->azPattern[i]);
}
blob_append(pDest, "]", 1);
}
/*
** Functionally equivalent to glob_render_json_to_blob()
** but outputs via cgi_print().
*/
void glob_render_json_to_cgi(Glob *pGlob){
int i = 0;
CX("[");
for( ; pGlob && i < pGlob->nPattern; ++i ){
if(i){
CX(",");
}
CX("%!j", pGlob->azPattern[i]);
}
CX("]");
}
/*
** COMMAND: test-glob
**
** Usage: %fossil test-glob PATTERN STRING...
**
** PATTERN is a comma- and whitespace-separated list of optionally
** quoted glob patterns. Show which of the STRINGs that follow match
** the PATTERN.
**
** If PATTERN begins with "@" the rest of the pattern is understood
** to be a setting name (such as binary-glob, crln-glob, or encoding-glob)
** and the value of that setting is used as the actually glob pattern.
*/
void glob_test_cmd(void){
Glob *pGlob;
int i;
char *zPattern;
if( g.argc<4 ) usage("PATTERN STRING ...");
zPattern = g.argv[2];
if( zPattern[0]=='@' ){
db_find_and_open_repository(OPEN_ANY_SCHEMA,0);
zPattern = db_get(zPattern+1, 0);
if( zPattern==0 ) fossil_fatal("no such setting: %s", g.argv[2]+1);
fossil_print("GLOB pattern: %s\n", zPattern);
}
fossil_print("SQL expression: %s\n", glob_expr("x", zPattern));
pGlob = glob_create(zPattern);
for(i=0; i<pGlob->nPattern; i++){
fossil_print("pattern[%d] = [%s]\n", i, pGlob->azPattern[i]);
}
for(i=3; i<g.argc; i++){
fossil_print("%d %s\n", glob_match(pGlob, g.argv[i]), g.argv[i]);
}
glob_free(pGlob);
}
|