tiny.zen.parseFrontmatter

1pub fn parse(storage: *storage_mod.Storage, markdown: []const u8) model.Error!model.Parsed {2    const regions = try storage.acquire(markdown);3    var iterator = scan.Iterator.init(markdown[regions.plan.metadata_start..regions.plan.metadata_end]);4    var pair_index: usize = 0;5    var byte_index: usize = 0;6    var current: ?usize = null;7    var continuation_start: usize = 0;8    var continuing = false;910    while (iterator.next()) |field| switch (field) {11        .pair => |pair| {12            std.debug.assert(pair_index < regions.pairs.len);13            regions.pairs[pair_index] = .{ .key = pair.key, .value = pair.value };14            current = pair_index;15            continuing = false;16            pair_index += 1;17        },18        .continuation => |value| if (current) |index| {19            const active = &regions.pairs[index];20            if (!continuing) {21                continuation_start = byte_index;22                append(regions.continuation, &byte_index, active.value);23                if (active.value.len != 0) append(regions.continuation, &byte_index, " ");24                continuing = true;25            } else {26                append(regions.continuation, &byte_index, " ");27            }28            append(regions.continuation, &byte_index, value);29            active.value = regions.continuation[continuation_start..byte_index];30        },31    };32    std.debug.assert(pair_index == regions.pairs.len);33    std.debug.assert(byte_index == regions.continuation.len);34    return .{35        .metadata = .{ .pairs = regions.pairs },36        .body = markdown[regions.plan.body_start..],37    };38}

1/// Parses into active storage; the result borrows it until `reset`.2pub const parseFrontmatter = frontmatter.parse;