feat: improved parsing and regression test suite

.gitignore

@@ -4,8 +4,10 @@
 
 # Directories
 .cache/
-.zig-cache
-zig-out
+.zig-cache/
+zig-out/
+build/
+build-*
 
 # Temporary Files / Logs
 *.log

CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.20)
+
+project(InkCompiler LANGUAGES NONE)
+
+add_subdirectory(testing/regression)

build.zig

@@ -7,7 +7,6 @@ pub fn build(b: *std.Build) void {
         .root_source_file = b.path("src/root.zig"),
         .target = target,
     });
-
     const exe = b.addExecutable(.{
         .name = "inkc",
         .root_module = b.createModule(.{

src/Ast.zig

@@ -12,10 +12,14 @@ errors: []Error,
 
 pub const Node = struct {
     tag: Tag,
-    source_start: usize,
-    source_end: usize,
+    loc: Span,
     data: Data,
 
+    pub const Span = struct {
+        start: usize,
+        end: usize,
+    };
+
     pub const Tag = enum {
         file,
         false_literal,
@@ -107,6 +111,98 @@ pub const Node = struct {
             children: ?[]*Node,
         },
     };
+
+    fn create(gpa: std.mem.Allocator, tag: Tag, loc: Span) !*Node {
+        const node = try gpa.create(Node);
+        node.* = .{ .tag = tag, .loc = loc, .data = undefined };
+        return node;
+    }
+
+    pub fn createLeaf(gpa: std.mem.Allocator, tag: Tag, loc: Span) !*Node {
+        const node = try Node.create(gpa, tag, loc);
+        node.data = .{ .leaf = undefined };
+        return node;
+    }
+
+    pub fn createBinary(
+        gpa: std.mem.Allocator,
+        tag: Tag,
+        span: Span,
+        lhs: ?*Node,
+        rhs: ?*Node,
+    ) !*Node {
+        const node = try Node.create(gpa, tag, span);
+        node.data = .{
+            .bin = .{ .lhs = lhs, .rhs = rhs },
+        };
+        return node;
+    }
+
+    pub fn createList(
+        gpa: std.mem.Allocator,
+        tag: Tag,
+        span: Span,
+        items: ?[]*Node,
+    ) !*Node {
+        const node = try Node.create(gpa, tag, span);
+        node.data = .{
+            .list = .{ .items = items },
+        };
+        return node;
+    }
+
+    pub fn createChoice(
+        gpa: std.mem.Allocator,
+        tag: Tag,
+        span: Span,
+        start_expr: ?*Node,
+        option_expr: ?*Node,
+        inner_expr: ?*Node,
+    ) !*Node {
+        const node = try Node.create(gpa, tag, span);
+        node.data = .{
+            .choice_expr = .{
+                .start_expr = start_expr,
+                .option_expr = option_expr,
+                .inner_expr = inner_expr,
+            },
+        };
+        return node;
+    }
+
+    pub fn createSwitch(
+        gpa: std.mem.Allocator,
+        tag: Tag,
+        loc: Span,
+        condition_expr: ?*Node,
+        cases_list: ?[]*Node,
+    ) !*Node {
+        const node = try Node.create(gpa, tag, loc);
+        node.data = .{
+            .switch_stmt = .{
+                .condition_expr = condition_expr,
+                .cases = cases_list,
+            },
+        };
+        return node;
+    }
+
+    pub fn createKnot(
+        gpa: std.mem.Allocator,
+        tag: Tag,
+        loc: Span,
+        prototype: *Node,
+        children: ?[]*Node,
+    ) !*Node {
+        const node = try Node.create(gpa, tag, loc);
+        node.data = .{
+            .knot_decl = .{
+                .prototype = prototype,
+                .children = children,
+            },
+        };
+        return node;
+    }
 };
 
 pub const Error = struct {
@@ -134,121 +230,6 @@ pub const Error = struct {
     };
 };
 
-fn create(
-    gpa: std.mem.Allocator,
-    tag: Node.Tag,
-    source_start: usize,
-    source_end: usize,
-) !*Node {
-    const node = try gpa.create(Node);
-    node.* = .{
-        .tag = tag,
-        .source_start = source_start,
-        .source_end = source_end,
-        .data = undefined,
-    };
-    return node;
-}
-
-pub fn createLeafNode(
-    gpa: std.mem.Allocator,
-    tag: Node.Tag,
-    source_start: usize,
-    source_end: usize,
-) !*Node {
-    const node = try Ast.create(gpa, tag, source_start, source_end);
-    node.*.data = .{ .leaf = undefined };
-    return node;
-}
-
-pub fn createBinaryNode(
-    gpa: std.mem.Allocator,
-    tag: Node.Tag,
-    source_start: usize,
-    source_end: usize,
-    lhs: ?*Node,
-    rhs: ?*Node,
-) !*Node {
-    const node = try Ast.create(gpa, tag, source_start, source_end);
-    node.*.data = .{
-        .bin = .{
-            .lhs = lhs,
-            .rhs = rhs,
-        },
-    };
-    return node;
-}
-
-pub fn createListNode(
-    gpa: std.mem.Allocator,
-    tag: Node.Tag,
-    source_start: usize,
-    source_end: usize,
-    items: ?[]*Node,
-) !*Node {
-    const node = try Ast.create(gpa, tag, source_start, source_end);
-    node.*.data = .{
-        .list = .{ .items = items },
-    };
-    return node;
-}
-
-pub fn createChoiceExprNode(
-    gpa: std.mem.Allocator,
-    tag: Node.Tag,
-    source_start: usize,
-    source_end: usize,
-    start_expr: ?*Node,
-    option_expr: ?*Node,
-    inner_expr: ?*Node,
-) !*Node {
-    const node = try Ast.create(gpa, tag, source_start, source_end);
-    node.*.data = .{
-        .choice_expr = .{
-            .start_expr = start_expr,
-            .option_expr = option_expr,
-            .inner_expr = inner_expr,
-        },
-    };
-    return node;
-}
-
-pub fn createSwitchNode(
-    gpa: std.mem.Allocator,
-    tag: Node.Tag,
-    source_start: usize,
-    source_end: usize,
-    condition_expr: ?*Node,
-    cases_list: ?[]*Node,
-) !*Node {
-    const node = try Ast.create(gpa, tag, source_start, source_end);
-    node.*.data = .{
-        .switch_stmt = .{
-            .condition_expr = condition_expr,
-            .cases = cases_list,
-        },
-    };
-    return node;
-}
-
-pub fn createKnotDeclNode(
-    gpa: std.mem.Allocator,
-    tag: Node.Tag,
-    source_start: usize,
-    source_end: usize,
-    prototype: *Node,
-    children: ?[]*Node,
-) !*Node {
-    const node = try Ast.create(gpa, tag, source_start, source_end);
-    node.*.data = .{
-        .knot_decl = .{
-            .prototype = prototype,
-            .children = children,
-        },
-    };
-    return node;
-}
-
 pub fn parse(
     gpa: std.mem.Allocator,
     arena: std.mem.Allocator,

src/Ast/Render.zig

@@ -208,15 +208,15 @@ fn writeType(r: *Render, writer: *std.Io.Writer, node: *const Ast.Node) !void {
 
 fn writeLexeme(r: *Render, writer: *std.Io.Writer, node: *const Ast.Node) !void {
     const bytes = r.tree.source;
-    const lexeme = bytes[node.source_start..node.source_end];
+    const lexeme = bytes[node.loc.start..node.loc.end];
     try r.tty_config.setColor(writer, .yellow);
     try writer.print("`{s}`", .{lexeme});
     try r.tty_config.setColor(writer, .reset);
 }
 
 fn writeLineSpan(r: *Render, writer: *std.Io.Writer, node: *const Ast.Node) !void {
-    const line_start = r.lines.calculateLine(node.source_start);
-    const line_end = r.lines.calculateLine(node.source_end);
+    const line_start = r.lines.calculateLine(node.loc.start);
+    const line_end = r.lines.calculateLine(node.loc.end);
 
     try r.tty_config.setColor(writer, .white);
     try writer.writeByte('<');
@@ -242,10 +242,10 @@ fn writeLineSpan(r: *Render, writer: *std.Io.Writer, node: *const Ast.Node) !voi
 }
 
 fn writeColumnSpan(r: *Render, writer: *std.Io.Writer, node: *const Ast.Node) !void {
-    const line_start = r.lines.calculateLine(node.source_start);
+    const line_start = r.lines.calculateLine(node.loc.start);
     const line_range = r.lines.ranges.items[line_start];
-    const column_start = (node.source_start - line_range.start);
-    const column_end = (node.source_end - line_range.start);
+    const column_start = (node.loc.start - line_range.start);
+    const column_end = (node.loc.end - line_range.start);
 
     try r.tty_config.setColor(writer, .white);
     try writer.writeByte('<');
@@ -271,10 +271,10 @@ fn writeColumnSpan(r: *Render, writer: *std.Io.Writer, node: *const Ast.Node) !v
 }
 
 fn writeLineColumnSpan(r: *Render, writer: *std.Io.Writer, node: *const Ast.Node) !void {
-    const line_start = r.lines.calculateLine(node.source_start);
+    const line_start = r.lines.calculateLine(node.loc.start);
     const line_range = r.lines.ranges.items[line_start];
-    const column_start = (node.source_start - line_range.start);
-    const column_end = (node.source_end - line_range.start);
+    const column_start = (node.loc.start - line_range.start);
+    const column_end = (node.loc.end - line_range.start);
 
     try r.tty_config.setColor(writer, .white);
     try writer.writeByte('<');

src/Parse.zig

@@ -1,10 +1,9 @@
 const std = @import("std");
-const assert = std.debug.assert;
 const tok = @import("tokenizer.zig");
+const Ast = @import("Ast.zig");
+const assert = std.debug.assert;
 const Token = tok.Token;
 const Tokenizer = tok.Tokenizer;
-const Ast = @import("Ast.zig");
-
 const Parse = @This();
 
 gpa: std.mem.Allocator,
@@ -99,7 +98,7 @@ fn getTokenInfixType(tag: Token.Tag) Ast.Node.Tag {
         .star => .multiply_expr,
         .slash => .divide_expr,
         // .question_mark => .contains_expr,
-        .equal => .assign_stmt,
+        // .equal => .assign_stmt,
         .ampersand_ampersand, .keyword_and => .logical_and_expr,
         .pipe_pipe, .keyword_or => .logical_or_expr,
         .equal_equal => .logical_equality_expr,
@@ -165,7 +164,6 @@ fn checkTokenInSet(p: *const Parse, tag_set: []const Token.Tag) bool {
 
 fn nextToken(p: *Parse) Token {
     assert(p.grammar_stack.items.len > 0);
-
     const token = p.token;
     const context = p.grammar_stack.getLast();
     p.token = p.tokenizer.next(context.grammar);
@@ -252,6 +250,7 @@ fn nodeListFromScratch(p: *Parse, start_offset: usize, end_offset: usize) Error!
 
     const span = end_offset - start_offset;
     assert(span > 0);
+
     const list = try p.arena.alloc(*Ast.Node, span);
     defer p.scratch.shrinkRetainingCapacity(start_offset);
 
@@ -261,7 +260,6 @@ fn nodeListFromScratch(p: *Parse, start_offset: usize, end_offset: usize) Error!
         list[li] = p.scratch.items[i];
         li += 1;
     }
-
     return list;
 }
 
@@ -269,15 +267,14 @@ fn makeNodeSequence(
     p: *Parse,
     context: *const StmtContext,
     tag: Ast.Node.Tag,
-    bytes_start: usize,
-    bytes_end: usize,
+    loc: Ast.Node.Span,
     scratch_offset: usize,
 ) Error!*Ast.Node {
     var list: ?[]*Ast.Node = null;
     if (!p.isScratchEmpty(context)) {
         list = try p.nodeListFromScratch(scratch_offset, p.scratch.items.len);
     }
-    return Ast.createListNode(p.arena, tag, bytes_start, bytes_end, list);
+    return .createList(p.arena, tag, loc, list);
 }
 
 fn isBlockStackEmpty(p: *Parse, context: *const StmtContext) bool {
@@ -337,23 +334,20 @@ fn collectBlock(p: *Parse, context: *StmtContext, level: usize) Error!?*Ast.Node
     const block = p.peekBlockStack(context);
     if (block.level < level) return null;
 
-    const bytes_start = block.source_offset;
-    var bytes_end: usize = 0;
+    const span_start = block.source_offset;
+    var span_end: usize = 0;
 
     if (!p.isScratchEmpty(context)) {
         const last = p.peekScratch(context);
-        bytes_end = last.source_end;
+        span_end = last.loc.end;
     } else {
-        bytes_end = bytes_start;
+        span_end = span_start;
     }
 
-    var node = try p.makeNodeSequence(
-        context,
-        .block_stmt,
-        bytes_start,
-        bytes_end,
-        block.scratch_offset,
-    );
+    var node = try p.makeNodeSequence(context, .block_stmt, .{
+        .start = span_start,
+        .end = span_end,
+    }, block.scratch_offset);
     node = try p.fixupBlock(context, node);
     _ = p.popBlockStack(context);
     return node;
@@ -407,13 +401,10 @@ fn collectContext(
             }
         }
 
-        const node = try p.makeNodeSequence(
-            context,
-            .choice_stmt,
-            choice_state.source_offset,
-            p.token.loc.start,
-            choice_state.scratch_offset,
-        );
+        const node = try p.makeNodeSequence(context, .choice_stmt, .{
+            .start = choice_state.source_offset,
+            .end = p.token.loc.start,
+        }, choice_state.scratch_offset);
         try p.scratch.append(p.gpa, node);
     }
     if (!should_gather) return p.collectBlock(context, level);
@@ -431,10 +422,11 @@ fn collectStitch(p: *Parse, context: *StmtContext) Error!?*Ast.Node {
         .function_prototype => .function_decl,
         else => return node,
     };
-    const span_start = proto.source_start;
-    const span_end = if (node) |n| n.source_end else proto.source_end;
     _ = p.popScratch(context);
-    return Ast.createBinaryNode(p.arena, tag, span_start, span_end, proto, node);
+    return .createBinary(p.arena, tag, .{
+        .start = proto.loc.start,
+        .end = if (node) |n| n.loc.end else proto.loc.end,
+    }, proto, node);
 }
 
 fn collectKnot(p: *Parse, context: *StmtContext) Error!?*Ast.Node {
@@ -449,10 +441,10 @@ fn collectKnot(p: *Parse, context: *StmtContext) Error!?*Ast.Node {
     const list = try p.nodeListFromScratch(p.knot_offset + 1, p.scratch.items.len);
     defer _ = p.popScratch(context);
 
-    const bytes_start = proto.source_start;
-    const bytes_end = if (child) |n| n.source_end else proto.source_end;
-
-    return Ast.createKnotDeclNode(p.arena, .knot_decl, bytes_start, bytes_end, proto, list);
+    return .createKnot(p.arena, .knot_decl, .{
+        .start = proto.loc.start,
+        .end = if (child) |n| n.loc.end else proto.loc.end,
+    }, proto, list);
 }
 
 fn handleChoiceBranch(p: *Parse, context: *StmtContext, node: *Ast.Node) !void {
@@ -462,14 +454,14 @@ fn handleChoiceBranch(p: *Parse, context: *StmtContext, node: *Ast.Node) !void {
         try p.block_stack.append(p.gpa, .{
             .level = 0,
             .scratch_offset = p.scratch.items.len,
-            .source_offset = node.source_start,
+            .source_offset = node.loc.start,
         });
     }
     if (p.isChoiceStackEmpty(context)) {
         try p.choice_stack.append(p.gpa, .{
             .level = level,
             .scratch_offset = p.scratch.items.len,
-            .source_offset = node.source_start,
+            .source_offset = node.loc.start,
         });
     } else {
         const choice_state = p.peekChoiceStack(context);
@@ -483,11 +475,10 @@ fn handleChoiceBranch(p: *Parse, context: *StmtContext, node: *Ast.Node) !void {
                     .source_offset = p.token.loc.start,
                 });
             }
-
             try p.choice_stack.append(p.gpa, .{
                 .level = level,
                 .scratch_offset = p.scratch.items.len,
-                .source_offset = node.source_start,
+                .source_offset = node.loc.start,
             });
         } else if (level == choice_state.level) {
             const t_node = try p.collectBlock(context, level);
@@ -500,16 +491,15 @@ fn handleChoiceBranch(p: *Parse, context: *StmtContext, node: *Ast.Node) !void {
 }
 
 fn handleGatherPoint(p: *Parse, context: *StmtContext, node: **Ast.Node) !void {
-    const token = p.token;
+    const main_token = p.token;
     const level = context.level;
 
     if (p.isBlockStackEmpty(context)) {
         assert(p.isChoiceStackEmpty(context));
-
         try p.block_stack.append(p.gpa, .{
             .level = 0,
             .scratch_offset = p.scratch.items.len,
-            .source_offset = node.*.source_start,
+            .source_offset = node.*.loc.start,
         });
     }
     // Gather points terminate compound statements at the appropriate level.
@@ -522,20 +512,16 @@ fn handleGatherPoint(p: *Parse, context: *StmtContext, node: **Ast.Node) !void {
                 try p.block_stack.append(p.gpa, .{
                     .level = choice_state.level,
                     .scratch_offset = p.scratch.items.len,
-                    .source_offset = node.*.source_start,
+                    .source_offset = node.*.loc.start,
                 });
             }
         } else if (!p.isScratchEmpty(context)) {
             const tmp = (try p.collectContext(context, level - 1, true)) orelse @panic("FUCK!");
             if (tmp.tag == .choice_stmt) {
-                node.* = try Ast.createBinaryNode(
-                    p.arena,
-                    .gathered_stmt,
-                    tmp.source_start,
-                    token.loc.start,
-                    tmp,
-                    node.*,
-                );
+                node.* = try Ast.Node.createBinary(p.arena, .gathered_stmt, .{
+                    .start = tmp.loc.start,
+                    .end = main_token.loc.start,
+                }, tmp, node.*);
             }
             if (!p.isBlockStackEmpty(context)) {
                 const b = p.peekBlockStack(context);
@@ -553,7 +539,7 @@ fn handleContentStmt(p: *Parse, context: *StmtContext, node: *Ast.Node) !void {
         try p.block_stack.append(p.gpa, .{
             .level = 0,
             .scratch_offset = p.scratch.items.len,
-            .source_offset = node.source_start,
+            .source_offset = node.loc.start,
         });
     }
     if (!p.isChoiceStackEmpty(context)) {
@@ -564,7 +550,7 @@ fn handleContentStmt(p: *Parse, context: *StmtContext, node: *Ast.Node) !void {
             try p.block_stack.append(p.gpa, .{
                 .level = choice_state.level,
                 .scratch_offset = p.scratch.items.len,
-                .source_offset = node.source_start,
+                .source_offset = node.loc.start,
             });
         }
     }
@@ -600,10 +586,11 @@ fn expectExpr(p: *Parse) Error!*Ast.Node {
 }
 
 fn parseAtom(p: *Parse, tag: Ast.Node.Tag) Error!*Ast.Node {
-    const token = p.nextToken();
-    const span_start = token.loc.start;
-    const span_end = token.loc.end;
-    return Ast.createLeafNode(p.arena, tag, span_start, span_end);
+    const main_token = p.nextToken();
+    return .createLeaf(p.arena, tag, .{
+        .start = main_token.loc.start,
+        .end = main_token.loc.end,
+    });
 }
 
 fn parseIdentifier(p: *Parse) Error!*Ast.Node {
@@ -640,14 +627,15 @@ fn parsePrimaryExpr(p: *Parse) Error!?*Ast.Node {
 fn parsePrefixExpr(p: *Parse) Error!?*Ast.Node {
     switch (p.token.tag) {
         .keyword_not, .minus, .exclaimation_mark => {
-            const token = p.nextToken();
+            const main_token = p.nextToken();
             const lhs = try parsePrefixExpr(p);
             if (lhs == null) return null;
 
-            const tag = getTokenPrefixType(token.tag);
-            const bytes_start = token.loc.start;
-            const bytes_end = if (lhs) |n| n.source_end else p.token.loc.end;
-            return Ast.createBinaryNode(p.arena, tag, bytes_start, bytes_end, lhs, null);
+            const tag = getTokenPrefixType(main_token.tag);
+            return .createBinary(p.arena, tag, .{
+                .start = main_token.loc.start,
+                .end = if (lhs) |n| n.loc.end else p.token.loc.end,
+            }, lhs, null);
         },
         else => return parsePrimaryExpr(p),
     }
@@ -673,10 +661,10 @@ fn parseInfixExpr(
             next_node = try parseInfixExpr(p, null, token_precedence);
             if (next_node) |rhs| {
                 const tag = getTokenInfixType(token.tag);
-                const bytes_start = if (lhs) |n| n.source_start else token.loc.start;
-                const bytes_end = rhs.source_end;
-
-                lhs = try Ast.createBinaryNode(p.arena, tag, bytes_start, bytes_end, lhs, rhs);
+                lhs = try Ast.Node.createBinary(p.arena, tag, .{
+                    .start = if (lhs) |n| n.loc.start else token.loc.start,
+                    .end = rhs.loc.end,
+                }, lhs, rhs);
             } else return null;
         } else break;
     }
@@ -689,7 +677,7 @@ fn parseExpression(p: *Parse) Error!?*Ast.Node {
 
 fn parseStringExpr(p: *Parse) Error!*Ast.Node {
     assert(p.token.tag == .double_quote);
-    const leading_token = p.nextToken();
+    const main_token = p.nextToken();
 
     while (true) switch (p.token.tag) {
         .double_quote, .newline, .eof => break,
@@ -697,34 +685,42 @@ fn parseStringExpr(p: *Parse) Error!*Ast.Node {
     };
 
     const last_token = try p.expectToken(.double_quote, true);
-    const span_start = leading_token.loc.start;
-    const span_end = p.token.loc.start;
-    const expr = try Ast.createLeafNode(p.arena, .string_literal, leading_token.loc.end, last_token.loc.start);
-    return Ast.createBinaryNode(p.arena, .string_expr, span_start, span_end, expr, null);
+    const expr = try Ast.Node.createLeaf(p.arena, .string_literal, .{
+        .start = main_token.loc.end,
+        .end = last_token.loc.start,
+    });
+    return .createBinary(p.arena, .string_expr, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, expr, null);
 }
 
 fn parseContentString(p: *Parse, token_set: []const Token.Tag) Error!?*Ast.Node {
     const main_token = p.token;
     while (!p.checkTokenInSet(token_set)) _ = p.nextToken();
 
-    const span_start = main_token.loc.start;
-    const span_end = p.token.loc.start;
-    const tag: Ast.Node.Tag = if (span_start == span_end) .empty_string else .string_literal;
-    return Ast.createLeafNode(p.arena, tag, span_start, span_end);
+    return .createLeaf(p.arena, if (main_token.loc.start == p.token.loc.start)
+        .empty_string
+    else
+        .string_literal, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    });
 }
 
 fn parseExprStmt(p: *Parse, lhs: ?*Ast.Node) Error!*Ast.Node {
-    const token = p.token;
+    const main_token = p.token;
     const node = try parseInfixExpr(p, lhs, .none);
     _ = try p.expectNewline();
 
-    const bytes_start = if (lhs) |n| n.source_start else token.loc.start;
-    const bytes_end = p.token.loc.start;
-    return Ast.createBinaryNode(p.arena, .expr_stmt, bytes_start, bytes_end, node, null);
+    return .createBinary(p.arena, .expr_stmt, .{
+        .start = if (lhs) |n| n.loc.start else main_token.loc.start,
+        .end = p.token.loc.start,
+    }, node, null);
 }
 
 fn parseAssignStmt(p: *Parse) Error!*Ast.Node {
-    const token = p.token;
+    const main_token = p.token;
     const lhs = try parseIdentifierExpr(p);
 
     if (!p.checkToken(.equal)) return parseExprStmt(p, lhs);
@@ -733,21 +729,24 @@ fn parseAssignStmt(p: *Parse) Error!*Ast.Node {
     const rhs = try p.expectExpr();
     _ = try p.expectNewline();
 
-    const bytes_start = token.loc.start;
-    const bytes_end = p.token.loc.start;
-    return Ast.createBinaryNode(p.arena, .assign_stmt, bytes_start, bytes_end, lhs, rhs);
+    return .createBinary(p.arena, .assign_stmt, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, lhs, rhs);
 }
 
 fn parseTempDecl(p: *Parse) Error!*Ast.Node {
-    const token = p.nextToken();
+    const main_token = p.nextToken();
     const lhs = try p.expectIdentifier();
     _ = try p.expectToken(.equal, true);
+
     const rhs = try p.expectExpr();
     _ = try p.expectNewline();
 
-    const bytes_start = token.loc.start;
-    const bytes_end = p.token.loc.start;
-    return Ast.createBinaryNode(p.arena, .temp_decl, bytes_start, bytes_end, lhs, rhs);
+    return .createBinary(p.arena, .temp_decl, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, lhs, rhs);
 }
 
 fn parseTildeStmt(p: *Parse) Error!*Ast.Node {
@@ -755,7 +754,7 @@ fn parseTildeStmt(p: *Parse) Error!*Ast.Node {
     defer p.popGrammar();
 
     _ = p.nextToken();
-    const node: *Ast.Node = switch (p.token.tag) {
+    const node = switch (p.token.tag) {
         .keyword_temp => try parseTempDecl(p),
         .keyword_return => try parseReturnStmt(p),
         .identifier => try parseAssignStmt(p),
@@ -766,17 +765,17 @@ fn parseTildeStmt(p: *Parse) Error!*Ast.Node {
 
 fn parseReturnStmt(p: *Parse) Error!*Ast.Node {
     var node: ?*Ast.Node = null;
-    const token = p.nextToken();
+    const main_token = p.nextToken();
 
     if (!p.checkToken(.newline) and !p.checkToken(.eof)) {
         node = try parseInfixExpr(p, null, .none);
     }
+
     _ = try p.expectNewline();
-
-    const bytes_start = token.loc.start;
-    const bytes_end = p.token.loc.start;
-
-    return Ast.createBinaryNode(p.arena, .return_stmt, bytes_start, bytes_end, node, null);
+    return .createBinary(p.arena, .return_stmt, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, node, null);
 }
 
 fn parseIdentifierExpr(p: *Parse) Error!*Ast.Node {
@@ -787,97 +786,44 @@ fn parseIdentifierExpr(p: *Parse) Error!*Ast.Node {
             .dot => {
                 _ = p.nextToken();
                 const rhs = try p.expectIdentifier();
-                const bytes_start = lhs.source_start;
-                const bytes_end = p.token.loc.start;
-
-                lhs = try Ast.createBinaryNode(
-                    p.arena,
-                    .selector_expr,
-                    bytes_start,
-                    bytes_end,
-                    lhs,
-                    rhs,
-                );
+                lhs = try Ast.Node.createBinary(p.arena, .selector_expr, .{
+                    .start = lhs.loc.start,
+                    .end = p.token.loc.start,
+                }, lhs, rhs);
             },
             .left_paren => {
                 const rhs = try parseArgumentList(p);
-                const bytes_start = lhs.source_start;
-                const bytes_end = p.token.loc.start;
-
-                return Ast.createBinaryNode(
-                    p.arena,
-                    .call_expr,
-                    bytes_start,
-                    bytes_end,
-                    lhs,
-                    rhs,
-                );
+                return .createBinary(p.arena, .call_expr, .{
+                    .start = lhs.loc.start,
+                    .end = p.token.loc.start,
+                }, lhs, rhs);
             },
             else => return lhs,
         }
     }
 }
-fn parseContentExpr(p: *Parse, token_set: []const Token.Tag) Error!?*Ast.Node {
+
+fn parseDivertExpr(p: *Parse) Error!*Ast.Node {
+    const main_token = p.nextToken();
+    const node = try parseIdentifierExpr(p);
+    return .createBinary(p.arena, .divert_expr, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, node, null);
+}
+
+fn parseDivertStmt(p: *Parse) Error!*Ast.Node {
+    try p.pushGrammar(.expression);
+    defer p.popGrammar();
+
     const main_token = p.token;
-    const context = makeStmtContext(p, .block, null);
+    const node = try parseDivertExpr(p);
+    _ = try p.expectNewline();
 
-    while (true) {
-        var node: ?*Ast.Node = null;
-        if (!p.checkTokenInSet(token_set)) {
-            node = try parseContentString(p, token_set);
-        } else switch (p.token.tag) {
-            .eof, .newline, .right_brace => break,
-            // .left_brace => node = try parseLbraceExpr(p),
-            // .right_arrow => node = try parseDivertStmt(p),
-            //.INK_TT_GLUE => node = ink_parse_glue(p),
-            else => {
-                return p.fail(.unexpected_token, p.token);
-            },
-        }
-        if (node) |n| try p.scratch.append(p.gpa, n);
-    }
-
-    const span_start = main_token.loc.start;
-    const span_end = p.token.loc.start;
-    return p.makeNodeSequence(&context, .content, span_start, span_end, context.scratch_top);
-}
-
-fn parseArgumentList(p: *Parse) Error!?*Ast.Node {
-    const context = p.makeStmtContext(.block, null);
-    const token = try p.expectToken(.left_paren, true);
-
-    if (!p.checkToken(.right_paren)) {
-        var cnt: usize = 0;
-        while (true) : (cnt += 1) {
-            if (cnt == p.max_argument_count) {
-                return p.fail(.too_many_arguments, p.token);
-            }
-
-            const node = try parseInfixExpr(p, null, .none);
-            if (node) |n| try p.scratch.append(p.gpa, n);
-            if (p.checkToken(.comma)) {
-                _ = p.nextToken();
-            } else break;
-        }
-    }
-
-    _ = try p.expectToken(.right_paren, false);
-    const bytes_start = token.loc.start;
-    const bytes_end = p.token.loc.start;
-    return p.makeNodeSequence(&context, .argument_list, bytes_start, bytes_end, context.scratch_top);
-}
-
-fn parseContentStmt(p: *Parse) Error!*Ast.Node {
-    const token_set = [_]Token.Tag{
-        .left_brace, .right_brace, .right_arrow,
-        .glue,       .newline,     .eof,
-    };
-    const main_token = p.token;
-    const node = try parseContentExpr(p, &token_set);
-    const end_token = try p.expectNewline();
-    const span_start = main_token.loc.start;
-    const span_end = end_token.loc.start;
-    return Ast.createBinaryNode(p.arena, .content_stmt, span_start, span_end, node, null);
+    return .createBinary(p.arena, .divert_stmt, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, node, null);
 }
 
 fn parseChoiceExpr(p: *Parse) Error!?*Ast.Node {
@@ -886,7 +832,7 @@ fn parseChoiceExpr(p: *Parse) Error!?*Ast.Node {
         .right_bracket, .right_arrow,  .newline,
         .eof,
     };
-    const token = p.token;
+    const main_token = p.token;
     var lhs: ?*Ast.Node = null;
     var mhs: ?*Ast.Node = null;
     var rhs: ?*Ast.Node = null;
@@ -920,50 +866,286 @@ fn parseChoiceExpr(p: *Parse) Error!?*Ast.Node {
             }
         }
     }
-
-    const bytes_start = token.loc.start;
-    const bytes_end = p.token.loc.start;
-    return Ast.createChoiceExprNode(p.arena, .choice_expr, bytes_start, bytes_end, lhs, mhs, rhs);
+    return .createChoice(p.arena, .choice_expr, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, lhs, mhs, rhs);
 }
 
 fn parseChoiceStmt(p: *Parse, context: *StmtContext) Error!*Ast.Node {
-    const token = p.token;
-    const level = p.eatTokenLooped(token.tag, true);
+    const main_token = p.token;
+    const level = p.eatTokenLooped(main_token.tag, true);
     const node = try parseChoiceExpr(p);
-    const bytes_start = token.loc.start;
-    const bytes_end = if (node) |n| n.source_end else p.token.loc.start;
-
+    const span_end = if (node) |n| n.loc.end else p.token.loc.start;
     context.level = level;
 
     if (p.checkToken(.newline)) _ = p.nextToken();
-    const tag = getBranchTag(token.tag);
-    return Ast.createBinaryNode(p.arena, tag, bytes_start, bytes_end, node, null);
+
+    return .createBinary(p.arena, getBranchTag(main_token.tag), .{
+        .start = main_token.loc.start,
+        .end = span_end,
+    }, node, null);
 }
 
 fn parseGatherPointStmt(p: *Parse, context: *StmtContext) Error!*Ast.Node {
-    const token = p.token;
-    const level = p.eatTokenLooped(token.tag, true);
-    const bytes_start = token.loc.start;
-    const bytes_end = p.token.loc.start;
-
+    const main_token = p.token;
+    const level = p.eatTokenLooped(main_token.tag, true);
+    const span_end = p.token.loc.start;
     context.level = level;
 
-    return Ast.createBinaryNode(p.arena, .gather_point_stmt, bytes_start, bytes_end, null, null);
+    p.eatToken(.whitespace);
+    p.eatToken(.newline);
+    return .createBinary(p.arena, .gather_point_stmt, .{
+        .start = main_token.loc.start,
+        .end = span_end,
+    }, null, null);
+}
+
+fn parseConditional(p: *Parse, main_token: Token, expr: ?*Ast.Node) Error!?*Ast.Node {
+    var context = p.makeStmtContext(.conditional, expr);
+    p.eatToken(.whitespace);
+
+    while (!p.checkToken(.eof) and !p.checkToken(.right_brace)) {
+        const node = parseStmt(p, &context) catch |err| switch (err) {
+            error.ParseError => {
+                if (p.panic_mode) p.synchronize();
+                p.eatToken(.newline);
+                continue;
+            },
+            else => |e| return e,
+        };
+        try p.scratch.append(p.gpa, node);
+    }
+
+    const end_token = try p.expectToken(.right_brace, true);
+    const node = try p.collectContext(&context, 0, false);
+    if (node) |n| try p.scratch.append(p.gpa, n);
+
+    const list = try p.nodeListFromScratch(context.scratch_top, p.scratch.items.len);
+    return .createSwitch(p.arena, if (expr != null and !context.is_block_created)
+        .switch_stmt
+    else if (expr == null and !context.is_block_created)
+        .multi_if_stmt
+    else
+        .if_stmt, .{
+        .start = main_token.loc.start,
+        .end = end_token.loc.start,
+    }, expr, list);
+}
+
+fn parseInlineIf(p: *Parse, main_token: Token, lhs: ?*Ast.Node) Error!?*Ast.Node {
+    const token_set = [_]Token.Tag{
+        .left_brace, .right_brace, .right_arrow,
+        .glue,       .newline,     .eof,
+    };
+    const scratch_top = p.scratch.items.len;
+
+    p.eatToken(.whitespace);
+
+    const content_node = try parseContentExpr(p, &token_set);
+    const end_token = try p.expectToken(.right_brace, true);
+    if (content_node) |n| try p.scratch.append(p.gpa, n);
+
+    const list = try p.nodeListFromScratch(scratch_top, p.scratch.items.len);
+    return try .createSwitch(p.arena, .if_stmt, .{
+        .start = main_token.loc.start,
+        .end = end_token.loc.end,
+    }, lhs, list);
+}
+
+fn parseLbraceExpr(p: *Parse) Error!?*Ast.Node {
+    const lbrace_token = p.token;
+    const lhs = n: {
+        try p.pushGrammar(.expression);
+        defer p.popGrammar();
+
+        _ = p.nextToken();
+        const node = try parseExpression(p);
+        break :n node;
+    };
+    if (lhs == null) {
+        try p.pushGrammar(.content);
+        defer p.popGrammar();
+
+        _ = try p.expectToken(.newline, true);
+        return parseConditional(p, lbrace_token, null);
+    }
+    if (p.checkToken(.right_brace)) {
+        const rbrace_token = p.nextToken();
+        return .createBinary(p.arena, .inline_logic_expr, .{
+            .start = lbrace_token.loc.start,
+            .end = rbrace_token.loc.end,
+        }, lhs, null);
+    }
+    _ = try p.expectToken(.colon, true);
+
+    if (p.checkToken(.newline)) {
+        _ = p.nextToken();
+        return parseConditional(p, lbrace_token, lhs);
+    } else {
+        _ = p.nextToken();
+        return parseInlineIf(p, lbrace_token, lhs);
+    }
+}
+
+fn parseContentExpr(p: *Parse, token_set: []const Token.Tag) Error!?*Ast.Node {
+    const main_token = p.token;
+    const context = makeStmtContext(p, .block, null);
+
+    while (true) {
+        var node: ?*Ast.Node = null;
+        if (!p.checkTokenInSet(token_set)) {
+            node = try parseContentString(p, token_set);
+        } else switch (p.token.tag) {
+            .eof, .newline, .right_brace => break,
+            .left_brace => node = try parseLbraceExpr(p),
+            .right_arrow => node = try parseDivertStmt(p),
+            //.INK_TT_GLUE => node = ink_parse_glue(p),
+            else => {
+                return p.fail(.unexpected_token, p.token);
+            },
+        }
+        if (node) |n| try p.scratch.append(p.gpa, n);
+    }
+    return p.makeNodeSequence(&context, .content, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, context.scratch_top);
+}
+
+fn parseContentStmt(p: *Parse) Error!*Ast.Node {
+    const token_set = [_]Token.Tag{
+        .left_brace, .right_brace, .right_arrow,
+        .glue,       .newline,     .eof,
+    };
+    const main_token = p.token;
+    const node = try parseContentExpr(p, &token_set);
+    const end_token = try p.expectNewline();
+    return .createBinary(p.arena, .content_stmt, .{
+        .start = main_token.loc.start,
+        .end = end_token.loc.start,
+    }, node, null);
+}
+
+fn parseParameterDecl(p: *Parse) Error!*Ast.Node {
+    const tag: Ast.Node.Tag = if (p.checkToken(.keyword_ref)) blk: {
+        _ = p.nextToken();
+        break :blk .ref_parameter_decl;
+    } else .parameter_decl;
+
+    const node = try p.expectIdentifier();
+    node.tag = tag;
+    return node;
+}
+
+fn parseParameterList(p: *Parse) Error!?*Ast.Node {
+    const context = p.makeStmtContext(.block, null);
+    const main_token = try p.expectToken(.left_paren, true);
+
+    if (!p.checkToken(.right_paren)) {
+        var cnt: usize = 0;
+        while (true) : (cnt += 1) {
+            if (cnt == p.max_argument_count) {
+                return p.fail(.too_many_parameters, p.token);
+            }
+
+            const node = try parseParameterDecl(p);
+            try p.scratch.append(p.gpa, node);
+
+            if (p.checkToken(.comma)) {
+                _ = p.nextToken();
+            } else break;
+        }
+    }
+
+    _ = try p.expectToken(.right_paren, true);
+    return p.makeNodeSequence(&context, .parameter_list, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, context.scratch_top);
+}
+
+fn parseArgumentList(p: *Parse) Error!?*Ast.Node {
+    const context = p.makeStmtContext(.block, null);
+    const main_token = try p.expectToken(.left_paren, true);
+
+    if (!p.checkToken(.right_paren)) {
+        var cnt: usize = 0;
+        while (true) : (cnt += 1) {
+            if (cnt == p.max_argument_count) {
+                return p.fail(.too_many_arguments, p.token);
+            }
+
+            const node = try parseInfixExpr(p, null, .none);
+            if (node) |n| try p.scratch.append(p.gpa, n);
+            if (p.checkToken(.comma)) {
+                _ = p.nextToken();
+            } else break;
+        }
+    }
+
+    _ = try p.expectToken(.right_paren, false);
+    return p.makeNodeSequence(&context, .argument_list, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, context.scratch_top);
+}
+
+fn parseConditionalBranch(p: *Parse, tag: Ast.Node.Tag) Error!?*Ast.Node {
+    const main_token = p.token;
+    var node_tag = tag;
+    var node: ?*Ast.Node = null;
+
+    if (p.checkToken(.keyword_else)) {
+        _ = p.nextToken();
+        node_tag = .else_branch;
+    } else {
+        node = try parseExpression(p);
+        if (node == null) return null;
+    }
+    if (!p.checkToken(.colon)) return null;
+    _ = p.nextToken();
+    if (p.checkToken(.newline)) _ = p.nextToken();
+
+    return .createBinary(p.arena, node_tag, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, node, null);
+}
+
+fn parseConditionalStmt(p: *Parse, context: *StmtContext) Error!*Ast.Node {
+    try p.pushGrammar(.expression);
+    defer p.popGrammar();
+    _ = p.nextToken();
+
+    const node = try parseConditionalBranch(p, if (context.expression_node) |_|
+        .switch_case
+    else
+        .if_branch);
+    if (node) |n| return n;
+
+    p.rewindGrammar();
+    try p.pushGrammar(.content);
+    defer p.popGrammar();
+
+    _ = p.nextToken();
+    return parseGatherPointStmt(p, context);
 }
 
 fn parseVar(p: *Parse, tag: Ast.Node.Tag) Error!*Ast.Node {
     try p.pushGrammar(.expression);
     defer p.popGrammar();
 
-    const token = p.nextToken();
+    const main_token = p.nextToken();
     const lhs = try p.expectIdentifier();
     _ = try p.expectToken(.equal, true);
 
     const rhs = try p.expectExpr();
     const last_token = try p.expectNewline();
-    const bytes_start = token.loc.start;
-    const bytes_end = last_token.loc.start;
-    return Ast.createBinaryNode(p.arena, tag, bytes_start, bytes_end, lhs, rhs);
+    return .createBinary(p.arena, tag, .{
+        .start = main_token.loc.start,
+        .end = last_token.loc.start,
+    }, lhs, rhs);
 }
 
 fn parseVarDecl(p: *Parse) Error!*Ast.Node {
@@ -976,6 +1158,43 @@ fn parseConstDecl(p: *Parse) Error!*Ast.Node {
     return parseVar(p, .const_decl);
 }
 
+fn parseKnotDecl(p: *Parse) Error!*Ast.Node {
+    var tag: Ast.Node.Tag = .stitch_prototype;
+    var lhs: ?*Ast.Node = null;
+    var rhs: ?*Ast.Node = null;
+    const main_token = p.nextToken();
+
+    try p.pushGrammar(.expression);
+    defer p.popGrammar();
+
+    p.eatToken(.whitespace);
+    if (p.checkToken(.equal)) {
+        tag = .knot_prototype;
+
+        while (p.checkToken(.equal)) {
+            _ = p.nextToken();
+        }
+    }
+    if (p.checkToken(.keyword_function)) {
+        _ = p.nextToken();
+        tag = .function_prototype;
+    }
+
+    lhs = try p.expectIdentifier();
+    if (p.checkToken(.left_paren)) {
+        rhs = try parseParameterList(p);
+    }
+    while (p.checkToken(.equal) or p.checkToken(.equal_equal)) {
+        _ = p.nextToken();
+    }
+
+    _ = try p.expectNewline();
+    return .createBinary(p.arena, tag, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.start,
+    }, lhs, rhs);
+}
+
 fn parseStmt(p: *Parse, context: *StmtContext) Error!*Ast.Node {
     p.eatToken(.whitespace);
 
@@ -983,15 +1202,14 @@ fn parseStmt(p: *Parse, context: *StmtContext) Error!*Ast.Node {
         .star, .plus => try parseChoiceStmt(p, context),
         .minus => switch (context.tag) {
             .block => try parseGatherPointStmt(p, context),
-            else => unreachable,
-            //.conditional => try parseConditionalStmt(p, context),
+            .conditional => try parseConditionalStmt(p, context),
         },
         .equal, .equal_equal => switch (context.tag) {
-            //.block => try parseKnotDecl(p),
+            .block => try parseKnotDecl(p),
             else => try parseContentStmt(p),
         },
         .tilde => try parseTildeStmt(p),
-        //.right_arrow => try parseDivertStmt(p),
+        .right_arrow => try parseDivertStmt(p),
         .right_brace => {
             const token = p.nextToken();
             return p.fail(.unexpected_token, token);
@@ -1022,12 +1240,11 @@ pub fn parseFile(p: *Parse) Error!*Ast.Node {
     try p.pushGrammar(.content);
     defer p.popGrammar();
 
-    const token = p.nextToken();
+    const main_token = p.nextToken();
     while (!p.checkToken(.eof)) {
         const node = parseStmt(p, &context) catch |err| switch (err) {
             error.ParseError => {
                 if (p.panic_mode) p.synchronize();
-
                 p.eatToken(.newline);
                 continue;
             },
@@ -1039,7 +1256,8 @@ pub fn parseFile(p: *Parse) Error!*Ast.Node {
     const node = try p.collectKnot(&context);
     if (node) |n| try p.scratch.append(p.gpa, n);
 
-    const span_start = token.loc.start;
-    const span_end = p.token.loc.end;
-    return p.makeNodeSequence(&context, .file, span_start, span_end, context.scratch_top);
+    return p.makeNodeSequence(&context, .file, .{
+        .start = main_token.loc.start,
+        .end = p.token.loc.end,
+    }, context.scratch_top);
 }

src/main.zig

@@ -31,11 +31,25 @@ fn mainArgs(
 ) !void {
     var source_path: ?[]const u8 = null;
     var arg_index: usize = 1;
+    var compile_only: bool = false;
+    var dump_ast: bool = false;
+    var use_stdin: bool = false;
+    var use_color: bool = false;
 
     while (arg_index < args_list.len) : (arg_index += 1) {
         const arg = args_list[arg_index];
         if (std.mem.startsWith(u8, arg, "-")) {
-            // TODO: Parse CLI options.
+            if (std.mem.eql(u8, arg, "--stdin")) {
+                use_stdin = true;
+            } else if (std.mem.eql(u8, arg, "--compile-only")) {
+                compile_only = true;
+            } else if (std.mem.eql(u8, arg, "--dump-ast")) {
+                dump_ast = true;
+            } else if (std.mem.eql(u8, arg, "--use-color")) {
+                use_color = true;
+            } else {
+                fatal("invalid parameter: '{s}'", .{arg});
+            }
         } else if (source_path == null) {
             source_path = arg;
         } else {
@@ -62,7 +76,8 @@ fn mainArgs(
     var stdout_writer = stdout.writer(&stdout_buffer);
 
     var story = try ink.Story.loadFromString(gpa, source_bytes, .{
-        .stream_writer = &stdout_writer.interface,
+        .dump_writer = &stdout_writer.interface,
+        .dump_use_color = use_color,
     });
     defer story.deinit();
 }

src/root.zig

@@ -4,8 +4,8 @@ pub const Ast = @import("Ast.zig");
 
 pub const Story = struct {
     pub const LoadOptions = struct {
-        stream_writer: *std.Io.Writer,
-        use_color: bool = true,
+        dump_writer: *std.Io.Writer,
+        dump_use_color: bool = true,
     };
 
     pub fn loadFromString(
@@ -20,12 +20,12 @@ pub const Story = struct {
         var ast = try Ast.parse(gpa, arena, source_bytes, "<STDIN>", 0);
         defer ast.deinit(gpa);
 
-        try ast.render(gpa, options.stream_writer, .{
-            .use_color = options.use_color,
+        try ast.render(gpa, options.dump_writer, .{
+            .use_color = options.dump_use_color,
         });
         if (ast.errors.len > 0) {
-            try ast.renderErrors(gpa, options.stream_writer, .{
-                .use_color = options.use_color,
+            try ast.renderErrors(gpa, options.dump_writer, .{
+                .use_color = options.dump_use_color,
             });
             return error.Invalid;
         }

testing/regression/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(LIT_CFG_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+
+configure_file(lit.site.cfg.py.in ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py @ONLY)
+
+find_program(LLVM_LIT_EXECUTABLE NAMES llvm-lit lit)
+
+add_custom_target(check
+    COMMAND ${LLVM_LIT_EXECUTABLE} -v "${CMAKE_CURRENT_BINARY_DIR}"
+)

testing/regression/lit.cfg.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+import os
+import lit.formats
+
+config.name = "Ink Compiler Regression Tests"
+config.suffixes = [".ink"]
+config.tools = ["FileCheck"]
+config.test_format = lit.formats.ShTest(execute_external=True)
+config.test_source_root = os.path.dirname(__file__)
+config.test_exec_root = os.path.join(config.project_build_root, "testing", "regression")
+exe_path = os.path.join(config.project_zig_root, "bin", "inkc")
+
+config.substitutions.append(("%ink-compiler", exe_path))

testing/regression/lit.site.cfg.py.in

@@ -0,0 +1,8 @@
+import os
+
+config.project_source_root = r"@CMAKE_SOURCE_DIR@"
+config.project_build_root = r"@CMAKE_BINARY_DIR@"
+config.project_zig_root = os.path.join(r"@CMAKE_SOURCE_DIR@", "zig-out")
+
+lit_config.load_config(
+        config, os.path.join(config.project_source_root, "testing", "regression", "lit.cfg.py"))

testing/regression/syntax/choice-branch-mixed.ink

@@ -0,0 +1,11 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:11, line:11>
+// CHECK-NEXT:    `--ChoiceStmt <line:11, line:11>
+// CHECK-NEXT:       `--ChoiceStarStmt <line:11, col:1:7>
+// CHECK-NEXT:          `--ChoiceContentExpr <col:3, col:7>
+// CHECK-NEXT:             |--ChoiceStartContentExpr `A` <col:3, col:4>
+// CHECK-NEXT:             `--ChoiceInnerContentExpr `B` <col:6, col:7>
+
+* A[]B

testing/regression/syntax/choice-nesting-normalize.ink

@@ -0,0 +1,26 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:22, line:26>
+// CHECK-NEXT:    `--ChoiceStmt <line:22, line:26>
+// CHECK-NEXT:       |--ChoiceStarStmt <line:22, col:1:8>
+// CHECK-NEXT:       |  `--ChoiceContentExpr <col:7, col:8>
+// CHECK-NEXT:       |     `--ChoiceStartContentExpr `A` <col:7, col:8>
+// CHECK-NEXT:       |--ChoiceStarStmt <line:23, col:1:7>
+// CHECK-NEXT:       |  `--ChoiceContentExpr <col:6, col:7>
+// CHECK-NEXT:       |     `--ChoiceStartContentExpr `B` <col:6, col:7>
+// CHECK-NEXT:       |--ChoiceStarStmt <line:24, col:1:6>
+// CHECK-NEXT:       |  `--ChoiceContentExpr <col:5, col:6>
+// CHECK-NEXT:       |     `--ChoiceStartContentExpr `C` <col:5, col:6>
+// CHECK-NEXT:       |--ChoiceStarStmt <line:25, col:1:5>
+// CHECK-NEXT:       |  `--ChoiceContentExpr <col:4, col:5>
+// CHECK-NEXT:       |     `--ChoiceStartContentExpr `D` <col:4, col:5>
+// CHECK-NEXT:       `--ChoiceStarStmt <line:26, col:1:4>
+// CHECK-NEXT:          `--ChoiceContentExpr <col:3, col:4>
+// CHECK-NEXT:             `--ChoiceStartContentExpr `E` <col:3, col:4>
+
+***** A
+**** B
+*** C
+** D
+* E

testing/regression/syntax/conditional-logical-and.ink

@@ -0,0 +1,27 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:23, line:27>
+// CHECK-NEXT:    |--TempDecl <line:23, col:3:13>
+// CHECK-NEXT:    |  |--Identifier `x` <col:8, col:9>
+// CHECK-NEXT:    |  `--NumberLiteral `2` <col:12, col:13>
+// CHECK-NEXT:    `--ContentStmt <line:25, col:1:48>
+// CHECK-NEXT:       `--Content <col:1, col:48>
+// CHECK-NEXT:          `--IfStmt <line:25, line:27>
+// CHECK-NEXT:             |--LogicalAndExpr <col:2, col:20>
+// CHECK-NEXT:             |  |--LogicalGreaterThanOrEqualExpr <col:2, col:8>
+// CHECK-NEXT:             |  |  |--Identifier `x` <col:2, col:3>
+// CHECK-NEXT:             |  |  `--NumberLiteral `1` <col:7, col:8>
+// CHECK-NEXT:             |  `--LogicalLesserThanOrEqualExpr <col:13, col:20>
+// CHECK-NEXT:             |     |--Identifier `x` <col:13, col:14>
+// CHECK-NEXT:             |     `--NumberLiteral `10` <col:18, col:20>
+// CHECK-NEXT:             `--BlockStmt <line:26, line:26>
+// CHECK-NEXT:                `--ContentStmt <line:26, col:5:25>
+// CHECK-NEXT:                   `--Content <col:5, col:25>
+// CHECK-NEXT:                      `--StringLiteral `Between one and ten!` <col:5, col:25>
+
+~ temp x = 2
+
+{x >= 1 and x <= 10:
+    Between one and ten!
+}

testing/regression/syntax/conditional-logical-or.ink

@@ -0,0 +1,27 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:23, line:27>
+// CHECK-NEXT:    |--TempDecl <line:23, col:3:13>
+// CHECK-NEXT:    |  |--Identifier `x` <col:8, col:9>
+// CHECK-NEXT:    |  `--NumberLiteral `2` <col:12, col:13>
+// CHECK-NEXT:    `--ContentStmt <line:25, col:1:56>
+// CHECK-NEXT:       `--Content <col:1, col:56>
+// CHECK-NEXT:          `--IfStmt <line:25, line:27>
+// CHECK-NEXT:             |--LogicalOrExpr <col:2, col:22>
+// CHECK-NEXT:             |  |--LogicalGreaterThanOrEqualExpr <col:2, col:8>
+// CHECK-NEXT:             |  |  |--Identifier `x` <col:2, col:3>
+// CHECK-NEXT:             |  |  `--NumberLiteral `1` <col:7, col:8>
+// CHECK-NEXT:             |  `--LogicalEqualityExpr <col:12, col:22>
+// CHECK-NEXT:             |     |--Identifier `x` <col:12, col:13>
+// CHECK-NEXT:             |     `--FalseLiteral <col:17, col:22>
+// CHECK-NEXT:             `--BlockStmt <line:26, line:26>
+// CHECK-NEXT:                `--ContentStmt <line:26, col:5:31>
+// CHECK-NEXT:                   `--Content <col:5, col:31>
+// CHECK-NEXT:                      `--StringLiteral `Greater than one or false!` <col:5, col:31>
+
+~ temp x = 2
+
+{x >= 1 or x == false:
+    Greater than one or false!
+}

testing/regression/syntax/conditional-simple-if-else.ink

@@ -0,0 +1,23 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:19, line:23>
+// CHECK-NEXT:    `--ContentStmt <line:19, col:1:52>
+// CHECK-NEXT:       `--Content <col:1, col:52>
+// CHECK-NEXT:          `--IfStmt <line:19, line:23>
+// CHECK-NEXT:             |--TrueLiteral <col:2, col:6>
+// CHECK-NEXT:             |--BlockStmt <line:20, line:20>
+// CHECK-NEXT:             |  `--ContentStmt <line:20, col:5:18>
+// CHECK-NEXT:             |     `--Content <col:5, col:18>
+// CHECK-NEXT:             |        `--StringLiteral `Hello, world!` <col:5, col:18>
+// CHECK-NEXT:             `--ElseBranch <col:3, col:13>
+// CHECK-NEXT:                `--BlockStmt <line:22, line:22>
+// CHECK-NEXT:                   `--ContentStmt <line:22, col:5:17>
+// CHECK-NEXT:                      `--Content <col:5, col:17>
+// CHECK-NEXT:                         `--StringLiteral `Unreachable!` <col:5, col:17>
+
+{true:
+    Hello, world!
+- else:
+    Unreachable!
+}

testing/regression/syntax/conditional-simple-if.ink

@@ -0,0 +1,16 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:14, line:16>
+// CHECK-NEXT:    `--ContentStmt <line:14, col:1:27>
+// CHECK-NEXT:       `--Content <col:1, col:27>
+// CHECK-NEXT:          `--IfStmt <line:14, line:16>
+// CHECK-NEXT:             |--TrueLiteral <col:2, col:6>
+// CHECK-NEXT:             `--BlockStmt <line:15, line:15>
+// CHECK-NEXT:                `--ContentStmt <line:15, col:5:18>
+// CHECK-NEXT:                   `--Content <col:5, col:18>
+// CHECK-NEXT:                      `--StringLiteral `Hello, world!` <col:5, col:18>
+
+{true:
+    Hello, world!
+}

testing/regression/syntax/conditional-simple-switch.ink

@@ -0,0 +1,43 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:36, line:43>
+// CHECK-NEXT:    |--TempDecl <line:36, col:3:13>
+// CHECK-NEXT:    |  |--Identifier `x` <col:8, col:9>
+// CHECK-NEXT:    |  `--NumberLiteral `3` <col:12, col:13>
+// CHECK-NEXT:    `--ContentStmt <line:38, col:1:51>
+// CHECK-NEXT:       `--Content <col:1, col:51>
+// CHECK-NEXT:          `--SwitchStmt <line:38, line:43>
+// CHECK-NEXT:             |--Identifier `x` <col:3, col:4>
+// CHECK-NEXT:             |--SwitchCase <col:3, col:7>
+// CHECK-NEXT:             |  |--NumberLiteral `0` <col:3, col:4>
+// CHECK-NEXT:             |  `--BlockStmt <line:39, line:39>
+// CHECK-NEXT:             |     `--ContentStmt <line:39, col:7:11>
+// CHECK-NEXT:             |        `--Content <col:7, col:11>
+// CHECK-NEXT:             |           `--StringLiteral `zero` <col:7, col:11>
+// CHECK-NEXT:             |--SwitchCase <col:3, col:7>
+// CHECK-NEXT:             |  |--NumberLiteral `1` <col:3, col:4>
+// CHECK-NEXT:             |  `--BlockStmt <line:40, line:40>
+// CHECK-NEXT:             |     `--ContentStmt <line:40, col:7:10>
+// CHECK-NEXT:             |        `--Content <col:7, col:10>
+// CHECK-NEXT:             |           `--StringLiteral `one` <col:7, col:10>
+// CHECK-NEXT:             |--SwitchCase <col:3, col:7>
+// CHECK-NEXT:             |  |--NumberLiteral `2` <col:3, col:4>
+// CHECK-NEXT:             |  `--BlockStmt <line:41, line:41>
+// CHECK-NEXT:             |     `--ContentStmt <line:41, col:7:10>
+// CHECK-NEXT:             |        `--Content <col:7, col:10>
+// CHECK-NEXT:             |           `--StringLiteral `two` <col:7, col:10>
+// CHECK-NEXT:             `--ElseBranch <col:3, col:9>
+// CHECK-NEXT:                `--BlockStmt <line:42, line:42>
+// CHECK-NEXT:                   `--ContentStmt <line:42, col:9:13>
+// CHECK-NEXT:                      `--Content <col:9, col:13>
+// CHECK-NEXT:                         `--StringLiteral `lots` <col:9, col:13>
+
+~ temp x = 3
+
+{ x:
+- 0: 	zero
+- 1: 	one
+- 2: 	two
+- else: lots
+}

testing/regression/syntax/conditional-substitution.ink

@@ -0,0 +1 @@
+{true: Hello world!}

testing/regression/syntax/const-expected-expression.ink

@@ -0,0 +1 @@
+CONST foo =

testing/regression/syntax/content-substitution.ink

@@ -0,0 +1,23 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:21, line:23>
+// CHECK-NEXT:    |--VarDecl <line:21, col:1:24>
+// CHECK-NEXT:    |  |--Identifier `x` <col:5, col:6>
+// CHECK-NEXT:    |  `--StringExpr `"Hello world 1"` <col:9, col:24>
+// CHECK-NEXT:    |     `--StringLiteral `Hello world 1` <col:10, col:23>
+// CHECK-NEXT:    |--ContentStmt <line:22, col:1:4>
+// CHECK-NEXT:    |  `--Content <col:1, col:4>
+// CHECK-NEXT:    |     `--InlineLogicExpr <col:1, col:4>
+// CHECK-NEXT:    |        `--Identifier `x` <col:2, col:3>
+// CHECK-NEXT:    `--ContentStmt <line:23, col:1:19>
+// CHECK-NEXT:       `--Content <col:1, col:19>
+// CHECK-NEXT:          |--StringLiteral `Hello ` <col:1, col:7>
+// CHECK-NEXT:          |--InlineLogicExpr <col:7, col:16>
+// CHECK-NEXT:          |  `--StringExpr `"world"` <col:8, col:15>
+// CHECK-NEXT:          |     `--StringLiteral `world` <col:9, col:14>
+// CHECK-NEXT:          `--StringLiteral ` 2.` <col:16, col:19>
+
+VAR x = "Hello world 1"
+{x}
+Hello {"world"} 2.

testing/regression/syntax/empty-choice-branch.ink

@@ -0,0 +1,9 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:9, line:9>
+// CHECK-NEXT:    `--ChoiceStmt <line:9, line:9>
+// CHECK-NEXT:       `--ChoiceStarStmt <line:9, col:1:2>
+// CHECK-NEXT:          `--ChoiceContentExpr <col:2, col:2>
+
+*

testing/regression/syntax/empty-file.ink

@@ -0,0 +1,3 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"

testing/regression/syntax/empty-knots.ink

@@ -0,0 +1,12 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: |--KnotDecl <line:11, line:11>
+// CHECK-NEXT: |  `--KnotProto <col:1, col:5>
+// CHECK-NEXT: |     `--Identifier `a` <col:4, col:5>
+// CHECK-NEXT: `--KnotDecl <line:12, line:12>
+// CHECK-NEXT:    `--KnotProto <col:1, col:5>
+// CHECK-NEXT:       `--Identifier `b` <col:4, col:5>
+
+== a
+== b

testing/regression/syntax/empty-logic.ink

@@ -0,0 +1 @@
+~

testing/regression/syntax/expression-statement.ink

@@ -0,0 +1,16 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:16, line:16>
+// CHECK-NEXT:    `--ExprStmt <line:16, col:3:20>
+// CHECK-NEXT:       `--SubtractExpr <col:4, col:20>
+// CHECK-NEXT:          |--MultiplyExpr <col:4, col:15>
+// CHECK-NEXT:          |  |--AddExpr <col:4, col:10>
+// CHECK-NEXT:          |  |  |--NegateExpr <col:4, col:6>
+// CHECK-NEXT:          |  |  |  `--NumberLiteral `1` <col:5, col:6>
+// CHECK-NEXT:          |  |  `--NumberLiteral `2` <col:9, col:10>
+// CHECK-NEXT:          |  `--NumberLiteral `3` <col:14, col:15>
+// CHECK-NEXT:          `--NegateExpr <col:18, col:20>
+// CHECK-NEXT:             `--NumberLiteral `4` <col:19, col:20>
+
+~ (-1 + 2) * 3 - -4

testing/regression/syntax/factorial.ink

@@ -0,0 +1,46 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: |--BlockStmt <line:39, line:39>
+// CHECK-NEXT: |  `--ContentStmt <line:39, col:1:18>
+// CHECK-NEXT: |     `--Content <col:1, col:18>
+// CHECK-NEXT: |        `--InlineLogicExpr <col:1, col:18>
+// CHECK-NEXT: |           `--CallExpr <col:3, col:17>
+// CHECK-NEXT: |              |--Identifier `factorial` <col:3, col:12>
+// CHECK-NEXT: |              `--ArgumentList <col:12, col:17>
+// CHECK-NEXT: |                 `--NumberLiteral `10` <col:13, col:15>
+// CHECK-NEXT: `--FunctionDecl <line:41, line:46>
+// CHECK-NEXT:    |--FunctionProto <col:1, col:25>
+// CHECK-NEXT:    |  |--Identifier `factorial` <col:13, col:22>
+// CHECK-NEXT:    |  `--ParamList <col:22, col:25>
+// CHECK-NEXT:    |     `--ParamDecl `n` <col:23, col:24>
+// CHECK-NEXT:    `--BlockStmt <line:42, line:46>
+// CHECK-NEXT:       `--ContentStmt <line:42, col:3:83>
+// CHECK-NEXT:          `--Content <col:3, col:83>
+// CHECK-NEXT:             `--IfStmt <line:42, line:46>
+// CHECK-NEXT:                |--LogicalEqualityExpr <col:5, col:11>
+// CHECK-NEXT:                |  |--Identifier `n` <col:5, col:6>
+// CHECK-NEXT:                |  `--NumberLiteral `1` <col:10, col:11>
+// CHECK-NEXT:                |--BlockStmt <line:43, line:43>
+// CHECK-NEXT:                |  `--ReturnStmt <line:43, col:9:17>
+// CHECK-NEXT:                |     `--NumberLiteral `1` <col:16, col:17>
+// CHECK-NEXT:                `--ElseBranch <col:7, col:19>
+// CHECK-NEXT:                   `--BlockStmt <line:45, line:45>
+// CHECK-NEXT:                      `--ReturnStmt <line:45, col:9:38>
+// CHECK-NEXT:                         `--MultiplyExpr <col:17, col:37>
+// CHECK-NEXT:                            |--Identifier `n` <col:17, col:18>
+// CHECK-NEXT:                            `--CallExpr <col:21, col:37>
+// CHECK-NEXT:                               |--Identifier `factorial` <col:21, col:30>
+// CHECK-NEXT:                               `--ArgumentList <col:30, col:37>
+// CHECK-NEXT:                                  `--SubtractExpr <col:31, col:36>
+// CHECK-NEXT:                                     |--Identifier `n` <col:31, col:32>
+// CHECK-NEXT:                                     `--NumberLiteral `1` <col:35, col:36>
+
+{ factorial(10) }
+
+== function factorial(n)
+  { n == 1:
+      ~ return 1
+    - else:
+      ~ return (n * factorial(n - 1))
+  }

testing/regression/syntax/fibonacci.ink

@@ -0,0 +1,62 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: |--BlockStmt <line:52, line:52>
+// CHECK-NEXT: |  `--ContentStmt <line:52, col:1:12>
+// CHECK-NEXT: |     `--Content <col:1, col:12>
+// CHECK-NEXT: |        `--InlineLogicExpr <col:1, col:12>
+// CHECK-NEXT: |           `--CallExpr <col:3, col:11>
+// CHECK-NEXT: |              |--Identifier `fib` <col:3, col:6>
+// CHECK-NEXT: |              `--ArgumentList <col:6, col:11>
+// CHECK-NEXT: |                 `--NumberLiteral `10` <col:7, col:9>
+// CHECK-NEXT: `--FunctionDecl <line:54, line:62>
+// CHECK-NEXT:    |--FunctionProto <col:1, col:19>
+// CHECK-NEXT:    |  |--Identifier `fib` <col:13, col:16>
+// CHECK-NEXT:    |  `--ParamList <col:16, col:19>
+// CHECK-NEXT:    |     `--ParamDecl `n` <col:17, col:18>
+// CHECK-NEXT:    `--BlockStmt <line:55, line:62>
+// CHECK-NEXT:       `--ContentStmt <line:55, col:3:121>
+// CHECK-NEXT:          `--Content <col:3, col:121>
+// CHECK-NEXT:             `--MultiIfStmt <line:55, line:62>
+// CHECK-NEXT:                |--IfBranch <col:7, col:21>
+// CHECK-NEXT:                |  |--LogicalEqualityExpr <col:7, col:13>
+// CHECK-NEXT:                |  |  |--Identifier `n` <col:7, col:8>
+// CHECK-NEXT:                |  |  `--NumberLiteral `0` <col:12, col:13>
+// CHECK-NEXT:                |  `--BlockStmt <line:57, line:57>
+// CHECK-NEXT:                |     `--ReturnStmt <line:57, col:9:17>
+// CHECK-NEXT:                |        `--NumberLiteral `0` <col:16, col:17>
+// CHECK-NEXT:                |--IfBranch <col:7, col:21>
+// CHECK-NEXT:                |  |--LogicalEqualityExpr <col:7, col:13>
+// CHECK-NEXT:                |  |  |--Identifier `n` <col:7, col:8>
+// CHECK-NEXT:                |  |  `--NumberLiteral `1` <col:12, col:13>
+// CHECK-NEXT:                |  `--BlockStmt <line:59, line:59>
+// CHECK-NEXT:                |     `--ReturnStmt <line:59, col:9:17>
+// CHECK-NEXT:                |        `--NumberLiteral `1` <col:16, col:17>
+// CHECK-NEXT:                `--ElseBranch <col:7, col:19>
+// CHECK-NEXT:                   `--BlockStmt <line:61, line:61>
+// CHECK-NEXT:                      `--ReturnStmt <line:61, col:9:39>
+// CHECK-NEXT:                         `--AddExpr <col:16, col:39>
+// CHECK-NEXT:                            |--CallExpr <col:16, col:27>
+// CHECK-NEXT:                            |  |--Identifier `fib` <col:16, col:19>
+// CHECK-NEXT:                            |  `--ArgumentList <col:19, col:27>
+// CHECK-NEXT:                            |     `--SubtractExpr <col:20, col:25>
+// CHECK-NEXT:                            |        |--Identifier `n` <col:20, col:21>
+// CHECK-NEXT:                            |        `--NumberLiteral `1` <col:24, col:25>
+// CHECK-NEXT:                            `--CallExpr <col:29, col:39>
+// CHECK-NEXT:                               |--Identifier `fib` <col:29, col:32>
+// CHECK-NEXT:                               `--ArgumentList <col:32, col:39>
+// CHECK-NEXT:                                  `--SubtractExpr <col:33, col:38>
+// CHECK-NEXT:                                     |--Identifier `n` <col:33, col:34>
+// CHECK-NEXT:                                     `--NumberLiteral `2` <col:37, col:38>
+
+{ fib(10) }
+
+== function fib(n)
+  {
+    - n == 0:
+      ~ return 0
+    - n == 1:
+      ~ return 1
+    - else:
+      ~ return fib(n - 1) + fib(n - 2)
+  }

testing/regression/syntax/function-simple.ink

@@ -0,0 +1,28 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: |--BlockStmt <line:25, line:25>
+// CHECK-NEXT: |  `--ContentStmt <line:25, col:1:13>
+// CHECK-NEXT: |     `--Content <col:1, col:13>
+// CHECK-NEXT: |        `--InlineLogicExpr <col:1, col:13>
+// CHECK-NEXT: |           `--CallExpr <col:2, col:12>
+// CHECK-NEXT: |              |--Identifier `func` <col:2, col:6>
+// CHECK-NEXT: |              `--ArgumentList <col:6, col:12>
+// CHECK-NEXT: |                 |--NumberLiteral `1` <col:7, col:8>
+// CHECK-NEXT: |                 `--NumberLiteral `2` <col:10, col:11>
+// CHECK-NEXT: `--FunctionDecl <line:27, line:28>
+// CHECK-NEXT:    |--FunctionProto <col:1, col:23>
+// CHECK-NEXT:    |  |--Identifier `func` <col:13, col:17>
+// CHECK-NEXT:    |  `--ParamList <col:17, col:23>
+// CHECK-NEXT:    |     |--ParamDecl `a` <col:18, col:19>
+// CHECK-NEXT:    |     `--ParamDecl `b` <col:21, col:22>
+// CHECK-NEXT:    `--BlockStmt <line:28, line:28>
+// CHECK-NEXT:       `--ReturnStmt <line:28, col:3:15>
+// CHECK-NEXT:          `--AddExpr <col:10, col:15>
+// CHECK-NEXT:             |--Identifier `a` <col:10, col:11>
+// CHECK-NEXT:             `--Identifier `b` <col:14, col:15>
+
+{func(1, 2)}
+
+== function func(a, b)
+~ return a + b

testing/regression/syntax/hello-world.ink

@@ -0,0 +1,9 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:9, line:9>
+// CHECK-NEXT:    `--ContentStmt <line:9, col:1:14>
+// CHECK-NEXT:       `--Content <col:1, col:14>
+// CHECK-NEXT:          `--StringLiteral `Hello, world!` <col:1, col:14>
+
+Hello, world!

testing/regression/syntax/knot-expected-identifier.ink

@@ -0,0 +1,2 @@
+=== 
+Hello, world!

testing/regression/syntax/knot-qualified-lookup.ink

@@ -0,0 +1,34 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: |--BlockStmt <line:30, line:30>
+// CHECK-NEXT: |  `--DivertStmt <line:30, col:1:16>
+// CHECK-NEXT: |     `--Divert <col:1, col:16>
+// CHECK-NEXT: |        `--CallExpr <col:4, col:16>
+// CHECK-NEXT: |           |--SelectorExpr <col:4, col:7>
+// CHECK-NEXT: |           |  |--Identifier `a` <col:4, col:5>
+// CHECK-NEXT: |           |  `--Identifier `b` <col:6, col:7>
+// CHECK-NEXT: |           `--ArgumentList <col:7, col:16>
+// CHECK-NEXT: |              `--StringExpr `"Brett"` <col:8, col:15>
+// CHECK-NEXT: |                 `--StringLiteral `Brett` <col:9, col:14>
+// CHECK-NEXT: `--KnotDecl <line:32, line:34>
+// CHECK-NEXT:    |--KnotProto <col:1, col:5>
+// CHECK-NEXT:    |  `--Identifier `a` <col:4, col:5>
+// CHECK-NEXT:    `--StitchDecl <line:33, line:34>
+// CHECK-NEXT:       |--StitchProto <col:1, col:10>
+// CHECK-NEXT:       |  |--Identifier `b` <col:3, col:4>
+// CHECK-NEXT:       |  `--ParamList <col:4, col:10>
+// CHECK-NEXT:       |     `--ParamDecl `name` <col:5, col:9>
+// CHECK-NEXT:       `--BlockStmt <line:34, line:34>
+// CHECK-NEXT:          `--ContentStmt <line:34, col:1:15>
+// CHECK-NEXT:             `--Content <col:1, col:15>
+// CHECK-NEXT:                |--StringLiteral `Hello, ` <col:1, col:8>
+// CHECK-NEXT:                |--InlineLogicExpr <col:8, col:14>
+// CHECK-NEXT:                |  `--Identifier `name` <col:9, col:13>
+// CHECK-NEXT:                `--StringLiteral `!` <col:14, col:15>
+
+-> a.b("Brett")
+
+== a
+= b(name)
+Hello, {name}!

testing/regression/syntax/knot-stitches.ink

@@ -0,0 +1,31 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--KnotDecl <line:26, line:31>
+// CHECK-NEXT:    |--KnotProto <col:1, col:13>
+// CHECK-NEXT:    |  `--Identifier `knot` <col:5, col:9>
+// CHECK-NEXT:    |--BlockStmt <line:27, line:27>
+// CHECK-NEXT:    |  `--ContentStmt <line:27, col:1:19>
+// CHECK-NEXT:    |     `--Content <col:1, col:19>
+// CHECK-NEXT:    |        `--StringLiteral `Hello from `knot`!` <col:1, col:19>
+// CHECK-NEXT:    |--StitchDecl <line:28, line:29>
+// CHECK-NEXT:    |  |--StitchProto <col:1, col:4>
+// CHECK-NEXT:    |  |  `--Identifier `a` <col:3, col:4>
+// CHECK-NEXT:    |  `--BlockStmt <line:29, line:29>
+// CHECK-NEXT:    |     `--ContentStmt <line:29, col:1:21>
+// CHECK-NEXT:    |        `--Content <col:1, col:21>
+// CHECK-NEXT:    |           `--StringLiteral `Hello from `knot.a`!` <col:1, col:21>
+// CHECK-NEXT:    `--StitchDecl <line:30, line:31>
+// CHECK-NEXT:       |--StitchProto <col:1, col:4>
+// CHECK-NEXT:       |  `--Identifier `b` <col:3, col:4>
+// CHECK-NEXT:       `--BlockStmt <line:31, line:31>
+// CHECK-NEXT:          `--ContentStmt <line:31, col:1:21>
+// CHECK-NEXT:             `--Content <col:1, col:21>
+// CHECK-NEXT:                `--StringLiteral `Hello from `knot.b`!` <col:1, col:21>
+
+=== knot ===
+Hello from `knot`!
+= a
+Hello from `knot.a`!
+= b
+Hello from `knot.b`!

testing/regression/syntax/nested-stitch.ink

@@ -0,0 +1,17 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--KnotDecl <line:15, line:17>
+// CHECK-NEXT:    |--KnotProto <col:1, col:13>
+// CHECK-NEXT:    |  `--Identifier `knot` <col:5, col:9>
+// CHECK-NEXT:    `--StitchDecl <line:16, line:17>
+// CHECK-NEXT:       |--StitchProto <col:1, col:9>
+// CHECK-NEXT:       |  `--Identifier `stitch` <col:3, col:9>
+// CHECK-NEXT:       `--BlockStmt <line:17, line:17>
+// CHECK-NEXT:          `--ContentStmt <line:17, col:1:14>
+// CHECK-NEXT:             `--Content <col:1, col:14>
+// CHECK-NEXT:                `--StringLiteral `Hello, world!` <col:1, col:14>
+
+=== knot ===
+= stitch
+Hello, world!

testing/regression/syntax/simple-assignment.ink

@@ -0,0 +1,13 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:12, line:13>
+// CHECK-NEXT:    |--TempDecl <line:12, col:3:15>
+// CHECK-NEXT:    |  |--Identifier `a` <col:8, col:9>
+// CHECK-NEXT:    |  `--NumberLiteral `123` <col:12, col:15>
+// CHECK-NEXT:    `--AssignStmt <line:13, col:3:10>
+// CHECK-NEXT:       |--Identifier `a` <col:3, col:4>
+// CHECK-NEXT:       `--NumberLiteral `321` <col:7, col:10>
+
+~ temp a = 123
+~ a = 321

testing/regression/syntax/simple-choice.ink

@@ -0,0 +1,18 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--BlockStmt <line:16, line:18>
+// CHECK-NEXT:    `--ChoiceStmt <line:16, line:18>
+// CHECK-NEXT:       |--ChoiceStarStmt <line:16, col:1:4>
+// CHECK-NEXT:       |  `--ChoiceContentExpr <col:3, col:4>
+// CHECK-NEXT:       |     `--ChoiceStartContentExpr `A` <col:3, col:4>
+// CHECK-NEXT:       |--ChoiceStarStmt <line:17, col:1:4>
+// CHECK-NEXT:       |  `--ChoiceContentExpr <col:3, col:4>
+// CHECK-NEXT:       |     `--ChoiceStartContentExpr `B` <col:3, col:4>
+// CHECK-NEXT:       `--ChoiceStarStmt <line:18, col:1:4>
+// CHECK-NEXT:          `--ChoiceContentExpr <col:3, col:4>
+// CHECK-NEXT:             `--ChoiceStartContentExpr `C` <col:3, col:4>
+
+* A
+* B
+* C

testing/regression/syntax/simple-knot.ink

@@ -0,0 +1,13 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--KnotDecl <line:12, line:13>
+// CHECK-NEXT:    |--KnotProto <col:1, col:13>
+// CHECK-NEXT:    |  `--Identifier `knot` <col:5, col:9>
+// CHECK-NEXT:    `--BlockStmt <line:13, line:13>
+// CHECK-NEXT:       `--ContentStmt <line:13, col:1:14>
+// CHECK-NEXT:          `--Content <col:1, col:14>
+// CHECK-NEXT:             `--StringLiteral `Hello, world!` <col:1, col:14>
+
+=== knot ===
+Hello, world!

testing/regression/syntax/simple-stitch.ink

@@ -0,0 +1,13 @@
+// RUN: %ink-compiler --stdin --compile-only --dump-ast < %s | FileCheck %s
+
+// CHECK: File "<STDIN>"
+// CHECK-NEXT: `--StitchDecl <line:12, line:13>
+// CHECK-NEXT:    |--StitchProto <col:1, col:9>
+// CHECK-NEXT:    |  `--Identifier `stitch` <col:3, col:9>
+// CHECK-NEXT:    `--BlockStmt <line:13, line:13>
+// CHECK-NEXT:       `--ContentStmt <line:13, col:1:14>
+// CHECK-NEXT:          `--Content <col:1, col:14>
+// CHECK-NEXT:             `--StringLiteral `Hello, world!` <col:1, col:14>
+
+= stitch
+Hello, world!

testing/regression/syntax/var-expected-expression.ink

@@ -0,0 +1 @@
+VAR foo =