From 9a7e88e33213135da7c8fa3607ca455d997f4a39 Mon Sep 17 00:00:00 2001
From: c
Date: Mon, 4 Mar 2024 13:11:29 -0500
Subject: One can now load simple variables into memory.

---
 src/doer.c         | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 src/include/doer.h | 36 +++++++++++++++++++++++++++++++-----
 src/main.c         |  2 ++
 3 files changed, 83 insertions(+), 8 deletions(-)

diff --git a/src/doer.c b/src/doer.c
index f446011..11aaeac 100644
--- a/src/doer.c
+++ b/src/doer.c
@@ -1,6 +1,28 @@
 #include "include/doer.h"
 #include "include/tree.h"
-#include "include/util.h"
+#include "include/util.h" 
+
+target_t* target_init(char* name, tree_t* tree) {
+   target_t* target = emalloc(sizeof(target_t));
+   target->name = name;
+   target->tree = tree;
+   target->nxt = NULL;
+   return target;
+}
+
+void target_destroy(target_t* target) {
+   if (target) {
+      target_destroy(target->nxt);
+      free(target->name);
+      free(target);
+   }
+}
+
+void target_print(target_t* target) {
+   if (!target) return;
+   LOG_DBGF("target: %s; points to tree: %p", target->name, target->tree);
+   target_print(target->nxt);
+}
 
 /* Creates a new doer from a tree.  */
 doer_t* doer_init(tree_t* tree) {
@@ -9,6 +31,8 @@ doer_t* doer_init(tree_t* tree) {
    doer = emalloc(sizeof(doer_t));
 
    doer->tree = tree;
+   doer->targets = NULL;
+   doer->ltarget = doer->targets;
 
    return doer;
 }
@@ -21,20 +45,27 @@ void doer_destroy(doer_t* doer) {
    free(doer);
 }
 
-void doer_do_blin_print(doer_t* doer) {
+void doer_add_target(doer_t* doer, target_t* target) {
+   // First target being added.
+   if (!doer->targets) doer->targets = doer->ltarget = target;
+   else doer->ltarget->nxt = target;
+}
+
+void blin_print(doer_t* doer) {
    printf(
       "%s",
       doer->tree->data.call.arg->data.carg.val->data.lstr.val
    );
 }
 
-void doer_do_blin_printl(doer_t* doer) {
+void blin_printl(doer_t* doer) {
    printf(
       "%s\n",
       doer->tree->data.call.arg->data.carg.val->data.lstr.val
    );
 }
 
+
 void doer_do_block(doer_t* doer) {
    if (!doer->tree) return;
    
@@ -52,11 +83,27 @@ void doer_do_expr(doer_t* doer) {
          /* Assume only call is `print` for now. */
          doer_do_call(doer);
          break;
+      case TREE_TYPE_DEF:
+         doer_do_def(doer);
+         break;
       default:
          LOG_WARF("unknown tree type: %d", doer->tree->type);
    }
 }
 
+void doer_do_def(doer_t* doer) {
+   target_t* target = target_init(
+      doer->tree->      // HACK: Grab the 2nd tag's value (w/o checking if
+                        // it's actually there…).
+         data.def.tag->
+         data.tag.nxt->
+         data.tag.val,
+      doer->tree
+   );
+
+   doer_add_target(doer, target);
+}
+
 void doer_do_call(doer_t* doer) {
    /* Search through built-in functions first. */
    for (int i = 0; i < sizeof(blinfs) / sizeof(blinf_t); i++) {
diff --git a/src/include/doer.h b/src/include/doer.h
index 8f51266..afa80dd 100644
--- a/src/include/doer.h
+++ b/src/include/doer.h
@@ -4,8 +4,29 @@
 #include "util.h"
 #include "tree.h"
 
+typedef struct TARGET {
+   char* name;          // The name of the target (unique).
+   tree_t* tree;        // The tree to which the target refers.
+   struct TARGET* nxt;  // The next target in the list.
+} target_t;
+
+target_t* target_init(char* name, tree_t* tree);
+/*
+   Destroy a target.
+   - Destroys all subsequent targets.
+   - Frees `name`.
+   - Does not free `tree`.
+   Remember to NULL a parent target's `nxt`.
+*/
+void target_destroy(target_t* target);
+// Print out the target list. Useful for debugging.
+void target_print(target_t* target);
+
 typedef struct DOER {
-   tree_t* tree;
+   tree_t* tree;        // The tree the doer is reading from.
+   target_t* targets;   // The targets the doer must remember.
+   target_t* ltarget;   // The last target in the list (after which new
+                        // targets will be appended.)
 } doer_t;
 
 /* Creates a new parser. */
@@ -23,8 +44,13 @@ typedef struct BLINF {
    char name[24];
 } blinf_t;
 
-void doer_do_blin_print(doer_t* tree); // Built-in function `print`.
-void doer_do_blin_printl(doer_t* tree); // Built-in function `print`.
+void doer_add_target(doer_t* doer, target_t* target);
+
+// Built-in functions.
+// `print`: print a string.
+void blin_print(doer_t* tree);
+// `printl`: print a string, and add a newline.
+void blin_printl(doer_t* tree);
 
 void doer_do_block(doer_t* tree);
 void doer_do_expr(doer_t* tree);
@@ -37,8 +63,8 @@ void doer_do_def(doer_t* tree);
 void doer_do_call(doer_t* tree);
 
 const static blinf_t blinfs[] = {
-   { doer_do_blin_print, "print" },
-   { doer_do_blin_printl, "printl" }
+   { blin_print, "print" },
+   { blin_printl, "printl" }
 };
 
 #endif
diff --git a/src/main.c b/src/main.c
index e7d345d..2a1507e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,4 +1,5 @@
 #include "include/main.h"
+#include "include/doer.h"
 
 /* FIXME: Segfaults ~30% of the time. No idea why. Thx future self <3. */
 int main(int argc, char* argv[]) {
@@ -42,6 +43,7 @@ int main(int argc, char* argv[]) {
 
    doer_t* doer = doer_init(parser->tree);
    doer_do_block(doer);
+   target_print(doer->targets);
 
    /* Clean up. */
    doer_destroy(doer);
-- 
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