wip: working on analyzer

- Feat: add `nest_ctx` and `fin_ctx` fns for working with context and
environment
- Feat: add block analyzer
- Feat: add conditional statement analyzer

src/compiler/analyzer/context.c

@@ -0,0 +1,38 @@
+#include <compiler/fzl_analyzer.h>
+#include <compiler/utils/fzl_symtable.h>
+#include <stdlib.h>
+
+// Nest context
+fzl_an_ctx_t *an_nest_ctx(fzl_analyzer_t *analyzer, fzl_an_ctx_type_t type)
+{
+  if (!analyzer)
+    return NULL;
+
+  fzl_an_ctx_t *ctx = malloc(sizeof(fzl_an_ctx_t));
+  if (!ctx)
+    return NULL;
+
+  ctx->type = type;
+  if (analyzer->ctx != NULL)
+    ctx->parent = analyzer->ctx;
+
+  analyzer->ctx                              = ctx;
+  analyzer->symbols[analyzer->symbols_top++] = fzl_mksymt();
+
+  return ctx;
+}
+
+// Close context and return parent
+fzl_an_ctx_t *an_fin_ctx(fzl_analyzer_t *analyzer)
+{
+  if (!analyzer || !analyzer->ctx)
+    return NULL;
+
+  fzl_an_ctx_t *current = analyzer->ctx;
+  fzl_an_ctx_t *parent  = current->parent;
+  analyzer->ctx         = parent;
+  fzl_freesymt(analyzer->symbols[--analyzer->symbols_top]);
+
+  free(current);
+  return parent;
+}