tiny.chant.TokenStorage

1pub const Storage = struct {2    phase: alloc_phase.capacity.Phase,3    capacity: capacity_mod.Capacity,4    storage: @This().Storage,5    tokens: []Token,67    pub const storage_alignment: usize = capacity_mod.storage_alignment;8    pub const Storage = []align(storage_alignment) u8;9    pub const Limits: type = capacity_mod.Limits;10    pub const Capacity: type = capacity_mod.Capacity;11    pub const Exhaustion: type = StreamExhaustion;12    pub const InitError = capacity_mod.DeriveError || error{StorageTooShort};13    pub const work_limits: alloc_phase.capacity.WorkLimits = .{14        .transition_steps_max = std.math.maxInt(usize),15        .cleanup_steps_per_call_max = 0,16        .cleanup_calls_at_capacity_max = 0,17    };18    pub const claim: alloc_phase.capacity.Declaration = .{19        .source = .{20            .id = "chant.lexed_token_storage",21            .kind = .phase_static,22            .limit_source = .caller,23            .storage = .{24                .covered = &.{25                    .{26                        .id = "exact_surveyed_lexed_token_sequence_including_eof",27                        .lifetime = .steady,28                        .detail = "exact surveyed lexed token sequence including EOF",29                    },30                },31                .excluded = &.{32                    "caller-owned stable source and file-name bytes borrowed by the survey and tokens",33                    "consumer-owned AST and diagnostic retention",34                },35            },36            .capacity = .{37                .inputs = &.{38                    alloc_phase.capacity.bindInput(capacity_mod.Limits, "tokens", "tokens"),39                },40                .type_selectors = &.{41                    alloc_phase.capacity.bindType(Token, "token"),42                },43                .nodes = &.{44                    .{ .input = 0 },45                    .{ .scale = .{ .node = 0, .coefficient = .{ .size_of_concrete_type = 0 } } },46                },47                .assertions = &.{.{48                    .scope = .closure_total,49                    .measure = .retained,50                    .relation = .exact,51                    .expression = 1,52                }},53            },54            .overload = .{55                .kind = .reject_before_mutation,56                .detail = "short storage and mismatched surveys reject before token placement",57            },58            .risks = .{59                .transitive = .{60                    .status = .witnessed,61                    .detail = "survey and fill call only the allocator-free lexer scanner",62                },63                .foreign = .{64                    .status = .excluded,65                    .detail = "lexing reads borrowed memory and crosses no foreign boundary",66                },67            },68            .work = .{ .equation = "survey and fill each take at most source bytes plus one lexer transition" },69            .obligations = &.{70                .{ .key = "chant_lexed_tokens_capacity", .role = .capacity_model },71                .{ .key = "chant_lexed_tokens_boundary", .role = .overload },72                .{ .key = "chant_lexed_tokens_oom", .role = .custom },73                .{ .key = "chant_lexed_tokens_identity", .role = .overload },74                .{ .key = "chant_lexed_tokens_sealed_transitive_risk", .role = .transitive_risk },75                .{ .key = "chant_lexed_tokens_sealed_foreign_risk", .role = .foreign_risk },76                .{ .key = "chant_lexed_tokens_differential", .role = .work_bound },77            },78        },79        .bindings = .{80            .owner = @This(),81            .seal = .{82                .family = alloc_phase.capacity.selector(@This().activate),83                .premise = .{84                    .class = .checked_semantic_fact,85                    .authority = .checker,86                },87            },88            .teardown = .{89                .family = alloc_phase.capacity.selector(@This().deinit),90                .premise = .{91                    .class = .checked_semantic_fact,92                    .authority = .checker,93                },94            },95        },96    };9798    pub fn init(99        storage: @This().Storage,100        limits: capacity_mod.Limits,101    ) InitError!@This() {102        const capacity = try capacity_mod.Capacity.derive(limits);103        if (storage.len < capacity.storage_bytes) return error.StorageTooShort;104        const owned = storage[0..capacity.storage_bytes];105        return .{106            .phase = .initialization,107            .capacity = capacity,108            .storage = owned,109            .tokens = typedTokens(owned, limits.tokens),110        };111    }112113    pub fn activate(self: *@This()) void {114        std.debug.assert(self.phase == .initialization);115        std.debug.assert(self.storage.len == self.capacity.storage_bytes);116        std.debug.assert(self.tokens.len == self.capacity.limits.tokens);117        self.phase = .steady;118    }119120    pub fn fill(121        self: *@This(),122        token_survey: Survey,123        source: []const u8,124        file: []const u8,125    ) (chant.lexer.Error || StreamExhaustion)![]const Token {126        std.debug.assert(self.phase == .steady);127        try requireIdentity(token_survey, source, file);128        if (token_survey.limits.tokens > self.tokens.len) {129            return error.TokenCapacityExceeded;130        }131132        var lexer = state.Lexer.init(source, file);133        var index: usize = 0;134        while (index < token_survey.limits.tokens) : (index += 1) {135            const tok = try scan.next(&lexer);136            self.tokens[index] = tok;137            if (tok.kind == .eof) {138                const token_count = index + 1;139                if (token_count != token_survey.limits.tokens) unreachable;140                return self.tokens[0..token_count];141            }142        }143        unreachable;144    }145146    pub fn deinit(self: *@This()) @This().Storage {147        std.debug.assert(self.phase == .steady);148        self.phase = .teardown;149        const storage = self.storage;150        self.* = undefined;151        return storage;152    }153};

1pub const TokenStorage = lexer.Storage;