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|
//! An abstract tree representation of a Markdown document.
const std = @import("std");
const builtin = @import("builtin");
const assert = std.debug.assert;
const Allocator = std.mem.Allocator;
const Renderer = @import("renderer.zig").Renderer;
nodes: Node.List.Slice,
extra: []u32,
string_bytes: []u8,
const Document = @This();
pub const Node = struct {
tag: Tag,
data: Data,
pub const Index = enum(u32) {
root = 0,
_,
};
pub const List = std.MultiArrayList(Node);
pub const Tag = enum {
/// Data is `container`.
root,
// Blocks
/// Data is `list`.
list,
/// Data is `list_item`.
list_item,
/// Data is `container`.
table,
/// Data is `container`.
table_row,
/// Data is `table_cell`.
table_cell,
/// Data is `heading`.
heading,
/// Data is `code_block`.
code_block,
/// Data is `container`.
blockquote,
/// Data is `container`.
paragraph,
/// Data is `none`.
thematic_break,
// Inlines
/// Data is `link`.
link,
/// Data is `text`.
autolink,
/// Data is `link`.
image,
/// Data is `container`.
strong,
/// Data is `container`.
emphasis,
/// Data is `text`.
code_span,
/// Data is `text`.
text,
/// Data is `none`.
line_break,
};
pub const Data = union {
none: void,
container: struct {
children: ExtraIndex,
},
text: struct {
content: StringIndex,
},
list: struct {
start: ListStart,
children: ExtraIndex,
},
list_item: struct {
tight: bool,
children: ExtraIndex,
},
table_cell: struct {
info: packed struct {
alignment: TableCellAlignment,
header: bool,
},
children: ExtraIndex,
},
heading: struct {
/// Between 1 and 6, inclusive.
level: u3,
children: ExtraIndex,
},
code_block: struct {
tag: StringIndex,
content: StringIndex,
},
link: struct {
target: StringIndex,
children: ExtraIndex,
},
comptime {
// In Debug and ReleaseSafe builds, there may be hidden extra fields
// included for safety checks. Without such safety checks enabled,
// we always want this union to be 8 bytes.
if (builtin.mode != .Debug and builtin.mode != .ReleaseSafe) {
assert(@sizeOf(Data) == 8);
}
}
};
/// The starting number of a list. This is either a number between 0 and
/// 999,999,999, inclusive, or `unordered` to indicate an unordered list.
pub const ListStart = enum(u30) {
// When https://github.com/ziglang/zig/issues/104 is implemented, this
// type can be more naturally expressed as ?u30. As it is, we want
// values to fit within 4 bytes, so ?u30 does not yet suffice for
// storage.
unordered = std.math.maxInt(u30),
_,
pub fn asNumber(start: ListStart) ?u30 {
if (start == .unordered) return null;
assert(@intFromEnum(start) <= 999_999_999);
return @intFromEnum(start);
}
};
pub const TableCellAlignment = enum(u2) {
unset,
left,
center,
right,
};
/// Trailing: `len` times `Node.Index`
pub const Children = struct {
len: u32,
};
};
pub const ExtraIndex = enum(u32) { _ };
/// The index of a null-terminated string in `string_bytes`.
pub const StringIndex = enum(u32) {
empty = 0,
_,
};
pub fn deinit(doc: *Document, allocator: Allocator) void {
doc.nodes.deinit(allocator);
allocator.free(doc.extra);
allocator.free(doc.string_bytes);
doc.* = undefined;
}
/// Renders a document directly to a writer using the default renderer.
pub fn render(doc: Document, writer: anytype) @TypeOf(writer).Error!void {
const renderer: Renderer(@TypeOf(writer), void) = .{ .context = {} };
try renderer.render(doc, writer);
}
pub fn ExtraData(comptime T: type) type {
return struct { data: T, end: usize };
}
pub fn extraData(doc: Document, comptime T: type, index: ExtraIndex) ExtraData(T) {
const fields = @typeInfo(T).@"struct".fields;
var i: usize = @intFromEnum(index);
var result: T = undefined;
inline for (fields) |field| {
@field(result, field.name) = switch (field.type) {
u32 => doc.extra[i],
else => @compileError("bad field type"),
};
i += 1;
}
return .{ .data = result, .end = i };
}
pub fn extraChildren(doc: Document, index: ExtraIndex) []const Node.Index {
const children = doc.extraData(Node.Children, index);
return @ptrCast(doc.extra[children.end..][0..children.data.len]);
}
pub fn string(doc: Document, index: StringIndex) [:0]const u8 {
const start = @intFromEnum(index);
return std.mem.span(@as([*:0]u8, @ptrCast(doc.string_bytes[start..].ptr)));
}
|
