ref: split parser into separate files

src/compiler/parser/pa_term.c

@@ -0,0 +1,40 @@
+#include <compiler/fzl_parser.h>
+#include <compiler/internals/parser.h>
+#include <stdio.h>
+
+// Parse TERM: addition and subtraction
+fzl_node_t *pa_term(fzl_parser_t *parser)
+{
+  if (!parser)
+    return NULL;
+
+  fzl_node_t *left  = pa_factor(parser);
+  fzl_node_t *right = NULL;
+
+  if (!left)
+    return NULL;
+
+  while (is(parser, FZL_TOKTYPE_PLUS) || is(parser, FZL_TOKTYPE_MINUS))
+  {
+    fzl_token_t *op = consume(parser);
+
+    right = pa_factor(parser);
+    if (!right)
+    {
+      fzl_freeast(left);
+      if (!plast_err[0])
+        snprintf(plast_err, sizeof(plast_err),
+                 "'%s': expected expression at %ld:%ld",
+                 last_known_tok->filename, last_known_tok->ln,
+                 last_known_tok->cn);
+      return NULL;
+    }
+
+    fzl_node_t *node      = fzl_mknode(math_op_to_type(op->type), op);
+    node->binary_op.left  = left;
+    node->binary_op.right = right;
+    left                  = node;
+  }
+
+  return left;
+}