intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 72 insertions, 0 deletions

diff --git a/util/string/util.cpp b/util/string/util.cpp
new file mode 100644
index 00000000000..b14f20bf75a
--- /dev/null
+++ b/util/string/util.cpp
@@ -0,0 +1,72 @@
+#include "util.h"
+
+#include <util/generic/utility.h>
+
+#include <cstdio>
+#include <cstdarg>
+#include <cstdlib>
+
+int a2i(const TString& s) {
+    return atoi(s.c_str());
+}
+
+//============================== span =====================================
+
+void str_spn::init(const char* charset, bool extended) {
+    // chars_table_1 is necessary to avoid some unexpected
+    // multi-threading issues
+    ui8 chars_table_1[256];
+    memset(chars_table_1, 0, sizeof(chars_table_1));
+    if (extended) {
+        for (const char* cs = charset; *cs; cs++) {
+            if (cs[1] == '-' && cs[2] != 0) {
+                for (int c = (ui8)*cs; c <= (ui8)cs[2]; c++) {
+                    chars_table_1[c] = 1;
+                }
+                cs += 2;
+                continue;
+            }
+            chars_table_1[(ui8)*cs] = 1;
+        }
+    } else {
+        for (; *charset; charset++) {
+            chars_table_1[(ui8)*charset] = 1;
+        }
+    }
+    memcpy(chars_table, chars_table_1, 256);
+    chars_table_1[0] = 1;
+    for (int n = 0; n < 256; n++) {
+        c_chars_table[n] = !chars_table_1[n];
+    }
+}
+
+Tr::Tr(const char* from, const char* to) {
+    for (size_t n = 0; n < 256; n++) {
+        Map[n] = (char)n;
+    }
+    for (; *from && *to; from++, to++) {
+        Map[(ui8)*from] = *to;
+    }
+}
+
+size_t Tr::FindFirstChangePosition(const TString& str) const {
+    for (auto it = str.begin(); it != str.end(); ++it) {
+        if (ConvertChar(*it) != *it) {
+            return it - str.begin();
+        }
+    }
+
+    return TString::npos;
+}
+
+void Tr::Do(TString& str) const {
+    const size_t changePosition = FindFirstChangePosition(str);
+
+    if (changePosition == TString::npos) {
+        return;
+    }
+
+    for (auto it = str.begin() + changePosition; it != str.end(); ++it) {
+        *it = ConvertChar(*it);
+    }
+}