Reqrite project as BEd specific.

src/internal/address/address.cc

@@ -0,0 +1,133 @@
+#include "internal/address/address.h"
+
+namespace bed::internal::address {
+Address::Address(std::string &cmd, uint64_t &i) {
+  base = None{};
+  auto skip_space = [&] {
+    while (i < cmd.size() && (cmd[i] == ' ' || cmd[i] == '\t'))
+      ++i;
+  };
+  skip_space();
+  if (i >= cmd.size())
+    return;
+  switch (cmd[i]) {
+  case '.':
+    base = Current();
+    i++;
+    break;
+  case '$':
+    base = Last();
+    i++;
+    break;
+  case '\'': {
+    i++;
+    if (i < cmd.size() && 'a' <= cmd[i] && cmd[i] <= 'z')
+      i++;
+    else
+      throw address_error("Invalid mark.");
+    base = Mark(cmd[i]);
+  } break;
+  case '/': {
+    i++;
+    uint64_t start = i;
+    while (true) {
+      if (i >= cmd.size())
+        break;
+      if (cmd[i] == '/')
+        break;
+      else if (cmd[i] == '\\')
+        i += 2;
+      else if (cmd[i] == '[' && i + 1 < cmd.size() && cmd[i + 1] == '[')
+        while (i < cmd.size() && !(cmd[i - 1] == ']' && cmd[i] == ']'))
+          i++;
+      else if (cmd[i] == '[')
+        while (i < cmd.size() && cmd[i] != ']')
+          i++;
+      else
+        i++;
+    }
+    base = RegexLine(Direction::Forward, cmd.substr(start, i - start));
+  } break;
+  case '?': {
+    i++;
+    uint64_t start = i;
+    while (true) {
+      if (i >= cmd.size())
+        break;
+      if (cmd[i] == '?')
+        break;
+      else if (cmd[i] == '\\')
+        i += 2;
+      else if (cmd[i] == '[' && i + 1 < cmd.size() && cmd[i + 1] == '[')
+        while (i < cmd.size() && !(cmd[i - 1] == ']' && cmd[i] == ']'))
+          i++;
+      else if (cmd[i] == '[')
+        while (i < cmd.size() && cmd[i] != ']')
+          i++;
+      else
+        i++;
+    }
+    base = RegexLine(Direction::Backward, cmd.substr(start, i - start));
+  } break;
+  case '+': {
+    base = Current();
+    i++;
+    skip_space();
+    uint64_t start = i;
+    int64_t num = 0;
+    while (i < cmd.size() && '0' <= cmd[i] && cmd[i] <= '9') {
+      num = num * 10 + (cmd[i] - '0');
+      i++;
+    }
+    if (start == i)
+      num = 1;
+    offset += num;
+  } break;
+  case '-': {
+    base = Current();
+    i++;
+    skip_space();
+    uint64_t start = i;
+    int64_t num = 0;
+    while (i < cmd.size() && '0' <= cmd[i] && cmd[i] <= '9') {
+      num = num * 10 + (cmd[i] - '0');
+      i++;
+    }
+    if (start == i)
+      num = 1;
+    offset -= num;
+  } break;
+  default: {
+    if ('0' <= cmd[i] && cmd[i] <= '9') {
+      uint64_t num = 0;
+      while (i < cmd.size() && '0' <= cmd[i] && cmd[i] <= '9') {
+        num = num * 10 + (cmd[i] - '0');
+        i++;
+      }
+      base = Number(num);
+    } else {
+      return;
+    }
+    break;
+  }
+  }
+  skip_space();
+  while (i < cmd.size() && (cmd[i] == '+' || cmd[i] == '-' || ('0' <= cmd[i] && cmd[i] <= '9'))) {
+    bool positive = cmd[i] != '-';
+    if (cmd[i] == '+' || cmd[i] == '-') {
+      i++;
+      skip_space();
+    }
+    uint64_t start = i;
+    int64_t num = 0;
+    while (i < cmd.size() && '0' <= cmd[i] && cmd[i] <= '9') {
+      num = num * 10 + (cmd[i] - '0');
+      i++;
+    }
+    if (start == i)
+      num = 1;
+    offset += positive ? num : -num;
+    skip_space();
+  }
+}
+} // namespace bed::internal::address