Move several needle/searching related functions into its own file.

[plocate] / needle.cpp

diff --git a/needle.cpp b/needle.cpp
new file mode 100644 (file)
index 0000000..60f1698
--- /dev/null
+++ b/needle.cpp
@@ -0,0 +1,62 @@
+#include "needle.h"
+
+#include "options.h"
+#include "parse_trigrams.h"
+
+#include <assert.h>
+#include <fnmatch.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <utility>
+
+using namespace std;
+
+bool matches(const Needle &needle, const char *haystack)
+{
+       if (needle.type == Needle::STRSTR) {
+               return strstr(haystack, needle.str.c_str()) != nullptr;
+       } else if (needle.type == Needle::GLOB) {
+               int flags = ignore_case ? FNM_CASEFOLD : 0;
+               return fnmatch(needle.str.c_str(), haystack, flags) == 0;
+       } else {
+               assert(needle.type == Needle::REGEX);
+               return regexec(&needle.re, haystack, /*nmatch=*/0, /*pmatch=*/nullptr, /*flags=*/0) == 0;
+       }
+}
+
+string unescape_glob_to_plain_string(const string &needle)
+{
+       string unescaped;
+       for (size_t i = 0; i < needle.size(); i += read_unigram(needle, i).second) {
+               uint32_t ch = read_unigram(needle, i).first;
+               assert(ch != WILDCARD_UNIGRAM);
+               if (ch == PREMATURE_END_UNIGRAM) {
+                       fprintf(stderr, "Pattern '%s' ended prematurely\n", needle.c_str());
+                       exit(1);
+               }
+               unescaped.push_back(ch);
+       }
+       return unescaped;
+}
+
+regex_t compile_regex(const string &needle)
+{
+       regex_t re;
+       int flags = REG_NOSUB;
+       if (ignore_case) {
+               flags |= REG_ICASE;
+       }
+       if (use_extended_regex) {
+               flags |= REG_EXTENDED;
+       }
+       int err = regcomp(&re, needle.c_str(), flags);
+       if (err != 0) {
+               char errbuf[256];
+               regerror(err, &re, errbuf, sizeof(errbuf));
+               fprintf(stderr, "Error when compiling regex '%s': %s\n", needle.c_str(), errbuf);
+               exit(1);
+       }
+       return re;
+}