return 0;
}
+enum grep_pat_token {
+ GREP_PATTERN,
+ GREP_AND,
+ GREP_OPEN_PAREN,
+ GREP_CLOSE_PAREN,
+ GREP_NOT,
+ GREP_OR,
+};
+
struct grep_pat {
struct grep_pat *next;
const char *origin;
int no;
+ enum grep_pat_token token;
const char *pattern;
regex_t regexp;
};
+enum grep_expr_node {
+ GREP_NODE_ATOM,
+ GREP_NODE_NOT,
+ GREP_NODE_AND,
+ GREP_NODE_OR,
+};
+
+struct grep_expr {
+ enum grep_expr_node node;
+ union {
+ struct grep_pat *atom;
+ struct grep_expr *unary;
+ struct {
+ struct grep_expr *left;
+ struct grep_expr *right;
+ } binary;
+ } u;
+};
+
struct grep_opt {
struct grep_pat *pattern_list;
struct grep_pat **pattern_tail;
+ struct grep_expr *pattern_expression;
regex_t regexp;
unsigned linenum:1;
unsigned invert:1;
#define GREP_BINARY_NOMATCH 1
#define GREP_BINARY_TEXT 2
unsigned binary:2;
+ unsigned extended:1;
int regflags;
unsigned pre_context;
unsigned post_context;
};
static void add_pattern(struct grep_opt *opt, const char *pat,
- const char *origin, int no)
+ const char *origin, int no, enum grep_pat_token t)
{
struct grep_pat *p = xcalloc(1, sizeof(*p));
p->pattern = pat;
p->origin = origin;
p->no = no;
+ p->token = t;
*opt->pattern_tail = p;
opt->pattern_tail = &p->next;
p->next = NULL;
}
+static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
+{
+ int err = regcomp(&p->regexp, p->pattern, opt->regflags);
+ if (err) {
+ char errbuf[1024];
+ char where[1024];
+ if (p->no)
+ sprintf(where, "In '%s' at %d, ",
+ p->origin, p->no);
+ else if (p->origin)
+ sprintf(where, "%s, ", p->origin);
+ else
+ where[0] = 0;
+ regerror(err, &p->regexp, errbuf, 1024);
+ regfree(&p->regexp);
+ die("%s'%s': %s", where, p->pattern, errbuf);
+ }
+}
+
+#if DEBUG
+static inline void indent(int in)
+{
+ int i;
+ for (i = 0; i < in; i++) putchar(' ');
+}
+
+static void dump_pattern_exp(struct grep_expr *x, int in)
+{
+ switch (x->node) {
+ case GREP_NODE_ATOM:
+ indent(in);
+ puts(x->u.atom->pattern);
+ break;
+ case GREP_NODE_NOT:
+ indent(in);
+ puts("--not");
+ dump_pattern_exp(x->u.unary, in+1);
+ break;
+ case GREP_NODE_AND:
+ dump_pattern_exp(x->u.binary.left, in+1);
+ indent(in);
+ puts("--and");
+ dump_pattern_exp(x->u.binary.right, in+1);
+ break;
+ case GREP_NODE_OR:
+ dump_pattern_exp(x->u.binary.left, in+1);
+ indent(in);
+ puts("--or");
+ dump_pattern_exp(x->u.binary.right, in+1);
+ break;
+ }
+}
+
+static void looking_at(const char *msg, struct grep_pat **list)
+{
+ struct grep_pat *p = *list;
+ fprintf(stderr, "%s: looking at ", msg);
+ if (!p)
+ fprintf(stderr, "empty\n");
+ else
+ fprintf(stderr, "<%s>\n", p->pattern);
+}
+#else
+#define looking_at(a,b) do {} while(0)
+#endif
+
+static struct grep_expr *compile_pattern_expr(struct grep_pat **);
+static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x;
+
+ looking_at("atom", list);
+
+ p = *list;
+ switch (p->token) {
+ case GREP_PATTERN: /* atom */
+ x = xcalloc(1, sizeof (struct grep_expr));
+ x->node = GREP_NODE_ATOM;
+ x->u.atom = p;
+ *list = p->next;
+ return x;
+ case GREP_OPEN_PAREN:
+ *list = p->next;
+ x = compile_pattern_expr(list);
+ if (!x)
+ return NULL;
+ if (!*list || (*list)->token != GREP_CLOSE_PAREN)
+ die("unmatched parenthesis");
+ *list = (*list)->next;
+ return x;
+ default:
+ return NULL;
+ }
+}
+
+static struct grep_expr *compile_pattern_not(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x;
+
+ looking_at("not", list);
+
+ p = *list;
+ switch (p->token) {
+ case GREP_NOT:
+ if (!p->next)
+ die("--not not followed by pattern expression");
+ *list = p->next;
+ x = xcalloc(1, sizeof (struct grep_expr));
+ x->node = GREP_NODE_NOT;
+ x->u.unary = compile_pattern_not(list);
+ if (!x->u.unary)
+ die("--not followed by non pattern expression");
+ return x;
+ default:
+ return compile_pattern_atom(list);
+ }
+}
+
+static struct grep_expr *compile_pattern_and(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x, *y, *z;
+
+ looking_at("and", list);
+
+ x = compile_pattern_not(list);
+ p = *list;
+ if (p && p->token == GREP_AND) {
+ if (!p->next)
+ die("--and not followed by pattern expression");
+ *list = p->next;
+ y = compile_pattern_and(list);
+ if (!y)
+ die("--and not followed by pattern expression");
+ z = xcalloc(1, sizeof (struct grep_expr));
+ z->node = GREP_NODE_AND;
+ z->u.binary.left = x;
+ z->u.binary.right = y;
+ return z;
+ }
+ return x;
+}
+
+static struct grep_expr *compile_pattern_or(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x, *y, *z;
+
+ looking_at("or", list);
+
+ x = compile_pattern_and(list);
+ p = *list;
+ if (x && p && p->token != GREP_CLOSE_PAREN) {
+ y = compile_pattern_or(list);
+ if (!y)
+ die("not a pattern expression %s", p->pattern);
+ z = xcalloc(1, sizeof (struct grep_expr));
+ z->node = GREP_NODE_OR;
+ z->u.binary.left = x;
+ z->u.binary.right = y;
+ return z;
+ }
+ return x;
+}
+
+static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
+{
+ looking_at("expr", list);
+
+ return compile_pattern_or(list);
+}
+
static void compile_patterns(struct grep_opt *opt)
{
struct grep_pat *p;
+
+ /* First compile regexps */
for (p = opt->pattern_list; p; p = p->next) {
- int err = regcomp(&p->regexp, p->pattern, opt->regflags);
- if (err) {
- char errbuf[1024];
- char where[1024];
- if (p->no)
- sprintf(where, "In '%s' at %d, ",
- p->origin, p->no);
- else if (p->origin)
- sprintf(where, "%s, ", p->origin);
- else
- where[0] = 0;
- regerror(err, &p->regexp, errbuf, 1024);
- regfree(&p->regexp);
- die("%s'%s': %s", where, p->pattern, errbuf);
- }
+ if (p->token == GREP_PATTERN)
+ compile_regexp(p, opt);
+ else
+ opt->extended = 1;
}
+
+ if (!opt->extended)
+ return;
+
+ /* Then bundle them up in an expression.
+ * A classic recursive descent parser would do.
+ */
+ p = opt->pattern_list;
+ opt->pattern_expression = compile_pattern_expr(&p);
+#if DEBUG
+ dump_pattern_exp(opt->pattern_expression, 0);
+#endif
+ if (p)
+ die("incomplete pattern expression: %s", p->pattern);
}
static char *end_of_line(char *cp, unsigned long *left)
}
}
+static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol, char *eol)
+{
+ int hit = 0;
+ regmatch_t pmatch[10];
+
+ if (!opt->fixed) {
+ regex_t *exp = &p->regexp;
+ hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
+ pmatch, 0);
+ }
+ else {
+ hit = !fixmatch(p->pattern, bol, pmatch);
+ }
+
+ if (hit && opt->word_regexp) {
+ /* Match beginning must be either
+ * beginning of the line, or at word
+ * boundary (i.e. the last char must
+ * not be alnum or underscore).
+ */
+ if ((pmatch[0].rm_so < 0) ||
+ (eol - bol) <= pmatch[0].rm_so ||
+ (pmatch[0].rm_eo < 0) ||
+ (eol - bol) < pmatch[0].rm_eo)
+ die("regexp returned nonsense");
+ if (pmatch[0].rm_so != 0 &&
+ word_char(bol[pmatch[0].rm_so-1]))
+ hit = 0;
+ if (pmatch[0].rm_eo != (eol-bol) &&
+ word_char(bol[pmatch[0].rm_eo]))
+ hit = 0;
+ }
+ return hit;
+}
+
+static int match_expr_eval(struct grep_opt *opt,
+ struct grep_expr *x,
+ char *bol, char *eol)
+{
+ switch (x->node) {
+ case GREP_NODE_ATOM:
+ return match_one_pattern(opt, x->u.atom, bol, eol);
+ break;
+ case GREP_NODE_NOT:
+ return !match_expr_eval(opt, x->u.unary, bol, eol);
+ case GREP_NODE_AND:
+ return (match_expr_eval(opt, x->u.binary.left, bol, eol) &&
+ match_expr_eval(opt, x->u.binary.right, bol, eol));
+ case GREP_NODE_OR:
+ return (match_expr_eval(opt, x->u.binary.left, bol, eol) ||
+ match_expr_eval(opt, x->u.binary.right, bol, eol));
+ }
+ die("Unexpected node type (internal error) %d\n", x->node);
+}
+
+static int match_expr(struct grep_opt *opt, char *bol, char *eol)
+{
+ struct grep_expr *x = opt->pattern_expression;
+ return match_expr_eval(opt, x, bol, eol);
+}
+
+static int match_line(struct grep_opt *opt, char *bol, char *eol)
+{
+ struct grep_pat *p;
+ if (opt->extended)
+ return match_expr(opt, bol, eol);
+ for (p = opt->pattern_list; p; p = p->next) {
+ if (match_one_pattern(opt, p, bol, eol))
+ return 1;
+ }
+ return 0;
+}
+
static int grep_buffer(struct grep_opt *opt, const char *name,
char *buf, unsigned long size)
{
hunk_mark = "--\n";
while (left) {
- regmatch_t pmatch[10];
char *eol, ch;
int hit = 0;
- struct grep_pat *p;
eol = end_of_line(bol, &left);
ch = *eol;
*eol = 0;
- for (p = opt->pattern_list; p; p = p->next) {
- if (!opt->fixed) {
- regex_t *exp = &p->regexp;
- hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
- pmatch, 0);
- }
- else {
- hit = !fixmatch(p->pattern, bol, pmatch);
- }
+ hit = match_line(opt, bol, eol);
- if (hit && opt->word_regexp) {
- /* Match beginning must be either
- * beginning of the line, or at word
- * boundary (i.e. the last char must
- * not be alnum or underscore).
- */
- if ((pmatch[0].rm_so < 0) ||
- (eol - bol) <= pmatch[0].rm_so ||
- (pmatch[0].rm_eo < 0) ||
- (eol - bol) < pmatch[0].rm_eo)
- die("regexp returned nonsense");
- if (pmatch[0].rm_so != 0 &&
- word_char(bol[pmatch[0].rm_so-1]))
- hit = 0;
- if (pmatch[0].rm_eo != (eol-bol) &&
- word_char(bol[pmatch[0].rm_eo]))
- hit = 0;
- }
- if (hit)
- break;
- }
/* "grep -v -e foo -e bla" should list lines
* that do not have either, so inversion should
* be done outside.
char *argptr = randarg;
struct grep_pat *p;
+ if (opt->extended)
+ return -1;
len = nr = 0;
push_arg("grep");
if (opt->fixed)
* pattern, but then what follows it must be zero or more
* valid refs up to the -- (if exists), and then existing
* paths. If there is an explicit pattern, then the first
- * unrecocnized non option is the beginning of the refs list
+ * unrecognized non option is the beginning of the refs list
* that continues up to the -- (if exists), and then paths.
*/
/* ignore empty line like grep does */
if (!buf[0])
continue;
- add_pattern(&opt, strdup(buf), argv[1], ++lno);
+ add_pattern(&opt, strdup(buf), argv[1], ++lno,
+ GREP_PATTERN);
}
fclose(patterns);
argv++;
argc--;
continue;
}
+ if (!strcmp("--not", arg)) {
+ add_pattern(&opt, arg, "command line", 0, GREP_NOT);
+ continue;
+ }
+ if (!strcmp("--and", arg)) {
+ add_pattern(&opt, arg, "command line", 0, GREP_AND);
+ continue;
+ }
+ if (!strcmp("--or", arg))
+ continue; /* no-op */
+ if (!strcmp("(", arg)) {
+ add_pattern(&opt, arg, "command line", 0, GREP_OPEN_PAREN);
+ continue;
+ }
+ if (!strcmp(")", arg)) {
+ add_pattern(&opt, arg, "command line", 0, GREP_CLOSE_PAREN);
+ continue;
+ }
if (!strcmp("-e", arg)) {
if (1 < argc) {
- add_pattern(&opt, argv[1], "-e option", 0);
+ add_pattern(&opt, argv[1], "-e option", 0,
+ GREP_PATTERN);
argv++;
argc--;
continue;
/* First unrecognized non-option token */
if (!opt.pattern_list) {
- add_pattern(&opt, arg, "command line", 0);
+ add_pattern(&opt, arg, "command line", 0,
+ GREP_PATTERN);
break;
}
else {