From ef78539671f7566417acb0501a5d6ef1f284f3a3 Mon Sep 17 00:00:00 2001
From: adamhutchings <adam.abahot@gmail.com>
Date: Wed, 26 Jun 2024 13:19:32 -0400
Subject: [PATCH 1/2] Add structures we'll need for the first parser iteration

---
 src/parser/cst.h | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/parser/cst.h

diff --git a/src/parser/cst.h b/src/parser/cst.h
new file mode 100644
index 0000000..59fa469
--- /dev/null
+++ b/src/parser/cst.h
@@ -0,0 +1,62 @@
+/**
+ * The structures for a concrete syntax tree.
+ * For now, the subset of C we are parsing is quite simple:
+ * - Parameterless functions.
+ * - Return statements, which accept integers or function calls.
+ */
+
+#pragma once
+
+#include "list.h"
+
+// A list of all node types.
+typedef enum {
+    NT_STMT,
+    NT_EXPR,
+    NT_BLOCK_STMT,
+    NT_RETURN_STMT,
+    NT_FUNCDECL,
+    NT_FUNCCALL,
+    NT_LITERAL,
+} NodeType;
+
+// A block statement is just a list of statements.
+typedef struct {
+    List* stmts; // A list of Statement structs.
+} BlockStatement;
+
+typedef struct {
+    // TODO -- add parameters whe we get there
+    BlockStatement body;
+    const char name[256]; // The actual name of the function.
+} FunctionDeclaration;
+
+// An entire program is just a list of top level declarations.
+// For now, such declarations are only functions.
+typedef struct {
+    union {
+        FunctionDeclaration fd;
+        // VariableDeclaration vd; when we get there
+    } u;
+    NodeType type;
+} TopLevelDeclaration;
+
+// Right now, a function call doesn't have any parameters so it's just the name
+// of the function being called.
+typedef struct {
+    const char name[256];
+} FunctionCall;
+
+// An expression for now is an integer or a function call.
+typedef struct {
+    union {
+        FunctionCall fc;
+        const char literal[256];
+    } u;
+    NodeType type;
+} Expression;
+
+// Finally, an entire source file is a list of top-level declarations.
+typedef struct {
+    List* decls; // list of TopLevelDeclaration
+} ConcreteFileTree;

From e669ebf8f2f0305d8a8ed04df118674b3af5bc9f Mon Sep 17 00:00:00 2001
From: adamhutchings <adam.abahot@gmail.com>
Date: Wed, 26 Jun 2024 13:21:48 -0400
Subject: [PATCH 2/2] Remove consts (because we need to set these names
 somehow)

---
 src/parser/cst.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/parser/cst.h b/src/parser/cst.h
index 59fa469..3184cf5 100644
--- a/src/parser/cst.h
+++ b/src/parser/cst.h
@@ -28,7 +28,7 @@ typedef struct {
 typedef struct {
     // TODO -- add parameters whe we get there
     BlockStatement body;
-    const char name[256]; // The actual name of the function.
+    char name[256]; // The actual name of the function.
 } FunctionDeclaration;
 
 // An entire program is just a list of top level declarations.
@@ -44,14 +44,14 @@ typedef struct {
 // Right now, a function call doesn't have any parameters so it's just the name
 // of the function being called.
 typedef struct {
-    const char name[256];
+    char name[256];
 } FunctionCall;
 
 // An expression for now is an integer or a function call.
 typedef struct {
     union {
         FunctionCall fc;
-        const char literal[256];
+        char literal[256];
     } u;
     NodeType type;
 } Expression;