1 files changed, 107 insertions, 0 deletions
diff --git a/src/tree_sitter/language.c b/src/tree_sitter/language.c
new file mode 100644
index 0000000000..1bfb1a8d03
--- /dev/null
+++ b/src/tree_sitter/language.c
@@ -0,0 +1,107 @@
+#include "./language.h"
+#include "./subtree.h"
+#include "./error_costs.h"
+#include <string.h>
+
+void ts_language_table_entry(const TSLanguage *self, TSStateId state,
+                             TSSymbol symbol, TableEntry *result) {
+  if (symbol == ts_builtin_sym_error || symbol == ts_builtin_sym_error_repeat) {
+    result->action_count = 0;
+    result->is_reusable = false;
+    result->actions = NULL;
+  } else {
+    assert(symbol < self->token_count);
+    uint32_t action_index = ts_language_lookup(self, state, symbol);
+    const TSParseActionEntry *entry = &self->parse_actions[action_index];
+    result->action_count = entry->count;
+    result->is_reusable = entry->reusable;
+    result->actions = (const TSParseAction *)(entry + 1);
+  }
+}
+
+uint32_t ts_language_symbol_count(const TSLanguage *language) {
+  return language->symbol_count + language->alias_count;
+}
+
+uint32_t ts_language_version(const TSLanguage *language) {
+  return language->version;
+}
+
+TSSymbolMetadata ts_language_symbol_metadata(const TSLanguage *language, TSSymbol symbol) {
+  if (symbol == ts_builtin_sym_error)  {
+    return (TSSymbolMetadata){.visible = true, .named = true};
+  } else if (symbol == ts_builtin_sym_error_repeat) {
+    return (TSSymbolMetadata){.visible = false, .named = false};
+  } else {
+    return language->symbol_metadata[symbol];
+  }
+}
+
+const char *ts_language_symbol_name(const TSLanguage *language, TSSymbol symbol) {
+  if (symbol == ts_builtin_sym_error) {
+    return "ERROR";
+  } else if (symbol == ts_builtin_sym_error_repeat) {
+    return "_ERROR";
+  } else {
+    return language->symbol_names[symbol];
+  }
+}
+
+TSSymbol ts_language_symbol_for_name(const TSLanguage *self, const char *name) {
+  if (!strcmp(name, "ERROR")) return ts_builtin_sym_error;
+
+  uint32_t count = ts_language_symbol_count(self);
+  for (TSSymbol i = 0; i < count; i++) {
+    if (!strcmp(self->symbol_names[i], name)) {
+      return i;
+    }
+  }
+  return 0;
+}
+
+TSSymbolType ts_language_symbol_type(const TSLanguage *language, TSSymbol symbol) {
+  TSSymbolMetadata metadata = ts_language_symbol_metadata(language, symbol);
+  if (metadata.named) {
+    return TSSymbolTypeRegular;
+  } else if (metadata.visible) {
+    return TSSymbolTypeAnonymous;
+  } else {
+    return TSSymbolTypeAuxiliary;
+  }
+}
+
+uint32_t ts_language_field_count(const TSLanguage *self) {
+  if (self->version >= TREE_SITTER_LANGUAGE_VERSION_WITH_FIELDS) {
+    return self->field_count;
+  } else {
+    return 0;
+  }
+}
+
+const char *ts_language_field_name_for_id(const TSLanguage *self, TSFieldId id) {
+  uint32_t count = ts_language_field_count(self);
+  if (count) {
+    return self->field_names[id];
+  } else {
+    return NULL;
+  }
+}
+
+TSFieldId ts_language_field_id_for_name(
+  const TSLanguage *self,
+  const char *name,
+  uint32_t name_length
+) {
+  uint32_t count = ts_language_field_count(self);
+  for (TSSymbol i = 1; i < count + 1; i++) {
+    switch (strncmp(name, self->field_names[i], name_length)) {
+      case 0:
+        return i;
+      case -1:
+        return 0;
+      default:
+        break;
+    }
+  }
+  return 0;
+}