dep: Add rapidyaml

dep/rapidyaml/src/c4/yml/preprocess.cpp

@@ -0,0 +1,112 @@
+#include "c4/yml/preprocess.hpp"
+#include "c4/yml/detail/parser_dbg.hpp"
+
+/** @file preprocess.hpp Functions for preprocessing YAML prior to parsing. */
+
+namespace c4 {
+namespace yml {
+
+C4_SUPPRESS_WARNING_GCC_CLANG_WITH_PUSH("-Wold-style-cast")
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+namespace {
+C4_ALWAYS_INLINE bool _is_idchar(char c)
+{
+    return (c >= 'a' && c <= 'z')
+        || (c >= 'A' && c <= 'Z')
+        || (c >= '0' && c <= '9')
+        || (c == '_' || c == '-' || c == '~' || c == '$');
+}
+
+typedef enum { kReadPending = 0, kKeyPending = 1, kValPending = 2 } _ppstate;
+C4_ALWAYS_INLINE _ppstate _next(_ppstate s)
+{
+    int n = (int)s + 1;
+    return (_ppstate)(n <= (int)kValPending ? n : 0);
+}
+} // empty namespace
+
+
+//-----------------------------------------------------------------------------
+
+size_t preprocess_rxmap(csubstr s, substr buf)
+{
+    detail::_SubstrWriter writer(buf);
+    _ppstate state = kReadPending;
+    size_t last = 0;
+
+    if(s.begins_with('{'))
+    {
+        RYML_CHECK(s.ends_with('}'));
+        s = s.offs(1, 1);
+    }
+
+    writer.append('{');
+
+    for(size_t i = 0; i < s.len; ++i)
+    {
+        const char curr = s[i];
+        const char next = i+1 < s.len ? s[i+1] : '\0';
+
+        if(curr == '\'' || curr == '"')
+        {
+            csubstr ss = s.sub(i).pair_range_esc(curr, '\\');
+            i += static_cast<size_t>(ss.end() - (s.str + i));
+            state = _next(state);
+        }
+        else if(state == kReadPending && _is_idchar(curr))
+        {
+            state = _next(state);
+        }
+
+        switch(state)
+        {
+        case kKeyPending:
+        {
+            if(curr == ':' && next == ' ')
+            {
+                state = _next(state);
+            }
+            else if(curr == ',' && next == ' ')
+            {
+                writer.append(s.range(last, i));
+                writer.append(": 1, ");
+                last = i + 2;
+            }
+            break;
+        }
+        case kValPending:
+        {
+            if(curr == '[' || curr == '{' || curr == '(')
+            {
+                csubstr ss = s.sub(i).pair_range_nested(curr, '\\');
+                i += static_cast<size_t>(ss.end() - (s.str + i));
+                state = _next(state);
+            }
+            else if(curr == ',' && next == ' ')
+            {
+                state = _next(state);
+            }
+            break;
+        }
+        default:
+            // nothing to do
+            break;
+        }
+    }
+
+    writer.append(s.sub(last));
+    if(state == kKeyPending)
+        writer.append(": 1");
+    writer.append('}');
+
+    return writer.pos;
+}
+
+C4_SUPPRESS_WARNING_GCC_CLANG_POP
+
+} // namespace yml
+} // namespace c4