From d5d52af26ec3d3e6a171564112978a7d8c96aba4 Mon Sep 17 00:00:00 2001
From: Vexu <git@vexu.eu>
Date: Mon, 6 Jan 2020 00:06:33 +0200
Subject: [PATCH] std-c parse pointer

---
 lib/std/c/ast.zig   | 84 ++++++++++++++++++++++++++++++++++++++++++---
 lib/std/c/parse.zig | 21 ++++++++----
 2 files changed, 93 insertions(+), 12 deletions(-)

diff --git a/lib/std/c/ast.zig b/lib/std/c/ast.zig
index 8801bbfc48..5d34d26fe2 100644
--- a/lib/std/c/ast.zig
+++ b/lib/std/c/ast.zig
@@ -126,7 +126,9 @@ pub const Node = struct {
         CompoundStmt,
         IfStmt,
         StaticAssert,
-        FnDef,
+        Fn,
+        Typedef,
+        Var,
     };
 
     pub const Root = struct {
@@ -274,13 +276,85 @@ pub const Node = struct {
         semicolon: TokenIndex,
     };
 
-    pub const FnDef = struct {
-        base: Node = Node{ .id = .FnDef },
+    pub const Declarator = struct {
+        pointer: *Pointer,
+        identifier: ?TokenIndex,
+        kind: union(enum) {
+            Simple,
+            Complex: struct {
+                lparen: TokenIndex,
+                inner: *Declarator,
+                rparen: TokenIndex,
+            },
+            Fn: ParamList,
+            Array: ArrayList,
+        },
+
+        pub const ArrayList = std.SegmentedList(*Array, 2);
+        pub const ParamList = std.SegmentedList(*Param, 4);
+    };
+
+    pub const Array = union(enum) {
+        Unspecified,
+        Variable: TokenIndex,
+        Known: *Expr,
+    };
+
+    pub const Pointer = struct {
+        asterisk: TokenIndex,
+        qual: TypeQual,
+        pointer: ?*Pointer,
+    };
+
+    pub const Param = struct {
+        kind: union(enum) {
+            Variable,
+            Old: TokenIndex,
+            Normal: struct {
+                decl_spec: *DeclSpec,
+                declarator: *Declarator,
+            },
+        },
+    };
+
+    pub const Fn = struct {
+        base: Node = Node{ .id = .Fn },
         decl_spec: DeclSpec,
-        declarator: *Node,
+        declarator: *Declarator,
         old_decls: OldDeclList,
-        body: *CompoundStmt,
+        body: ?*CompoundStmt,
 
         pub const OldDeclList = SegmentedList(*Node, 0);
     };
+
+    pub const Typedef = struct {
+        base: Node = Node{ .id = .Typedef },
+        decl_spec: DeclSpec,
+        declarators: DeclaratorList,
+
+        pub const DeclaratorList = std.SegmentedList(*Declarator, 2);
+    };
+
+    pub const Var = struct {
+        base: Node = Node{ .id = .Var },
+        decl_spec: DeclSpec,
+        initializers: Initializers,
+
+        pub const Initializers = std.SegmentedList(*Initialized, 2);
+    };
+
+    pub const Initialized = struct {
+        declarator: *Declarator,
+        eq: TokenIndex,
+        init: Initializer,
+    };
+
+    pub const Initializer = union(enum) {
+        list: struct {
+            initializers: InitializerList,
+            rbrace: TokenIndex,
+        },
+        expr: *Expr,
+        pub const InitializerList = std.SegmentedList(*Initializer, 4);
+    };
 };
diff --git a/lib/std/c/parse.zig b/lib/std/c/parse.zig
index 37e9814f7e..0925d65d8f 100644
--- a/lib/std/c/parse.zig
+++ b/lib/std/c/parse.zig
@@ -588,12 +588,19 @@ const Parser = struct {
     /// RecordDeclarator <- Declarator? (COLON ConstExpr)?
     fn recordDeclarator(parser: *Parser) !*Node {}
 
-    /// Declarator <- Pointer? DirectDeclarator
-    fn declarator(parser: *Parser) !*Node {}
-
     /// Pointer <- ASTERISK TypeQual* Pointer?
-    fn pointer(parser: *Parser) !*Node {}
-
+    fn pointer(parser: *Parser) !?*Node.Pointer {
+        const asterisk = parser.eatToken(.Asterisk) orelse return null;
+        const node = try parser.arena.create(Node.Pointer);
+        node.* = .{
+            .asterisk = asterisk,
+            .qual = .{},
+            .pointer = null,
+        };
+        while (try parser.typeQual(&node.qual)) {}
+        node.pointer = try parser.pointer();
+        return node;
+    }
     /// DirectDeclarator
     ///     <- IDENTIFIER
     ///     / LPAREN Declarator RPAREN
@@ -687,7 +694,7 @@ const Parser = struct {
 
     /// PrimaryExpr
     ///     <- IDENTIFIER
-    ///     / INTEGERLITERAL / FLITERAL / STRINGLITERAL / CHARLITERAL
+    ///     / INTEGERLITERAL / FLOATLITERAL / STRINGLITERAL / CHARLITERAL
     ///     / LPAREN Expr RPAREN
     ///     / Keyword_generic LPAREN AssignmentExpr (COMMA Generic)+ RPAREN
     fn primaryExpr(parser: *Parser) !*Node {}
@@ -714,7 +721,7 @@ const Parser = struct {
     fn initializer(parser: *Parser) !*Node {}
 
     /// Designator
-    ///     <- LBRACKET Initializers RBRACKET
+    ///     <- LBRACKET ConstExpr RBRACKET
     ///     / PERIOD IDENTIFIER
     fn designator(parser: *Parser) !*Node {}