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| 1 | const std = @import("std"); |
| 2 | |
| 3 | const c = @import("./c.zig"); |
| 4 | const u = @import("./index.zig"); |
| 5 | |
| 6 | // |
| 7 | // |
| 8 | |
| 9 | const Array = [][]const u8; |
| 10 | |
| 11 | pub const Document = struct { |
| 12 | mapping: Mapping, |
| 13 | }; |
| 14 | |
| 15 | pub const Item = union(enum) { |
| 16 | event: c.yaml_event_t, |
| 17 | kv: Key, |
| 18 | mapping: Mapping, |
| 19 | sequence: []Item, |
| 20 | document: Document, |
| 21 | }; |
| 22 | |
| 23 | pub const Key = struct { |
| 24 | key: []const u8, |
| 25 | value: Value, |
| 26 | }; |
| 27 | |
| 28 | pub const Value = union(enum) { |
| 29 | string: []const u8, |
| 30 | mapping: Mapping, |
| 31 | sequence: []Item, |
| 32 | }; |
| 33 | |
| 34 | pub const Mapping = struct { |
| 35 | items: []Key, |
| 36 | |
| 37 | pub fn get(self: Mapping, k: []const u8) ?Value { |
| 38 | for (self.items) |item| { |
| 39 | if (std.mem.eql(u8, item.key, k)) { |
| 40 | return item.value; |
| 41 | } |
| 42 | } |
| 43 | return null; |
| 44 | } |
| 45 | }; |
| 46 | |
| 47 | // |
| 48 | // |
| 49 | |
| 50 | pub fn parse(alloc: *std.mem.Allocator, input: []const u8) !Document { |
| 51 | |
| 52 | var parser: c.yaml_parser_t = undefined; |
| 53 | _ = c.yaml_parser_initialize(&parser); |
| 54 | |
| 55 | const lines = try u.split(input, "\n"); |
| 56 | |
| 57 | _ = c.yaml_parser_set_input_string(&parser, input.ptr, input.len); |
| 58 | |
| 59 | var all_events = std.ArrayList(Item).init(alloc); |
| 60 | var event: c.yaml_event_t = undefined; |
| 61 | while (true) { |
| 62 | const p = c.yaml_parser_parse(&parser, &event); |
| 63 | if (p == 0) { |
| 64 | break; |
| 65 | } |
| 66 | |
| 67 | const et = @enumToInt(event.type); |
| 68 | try all_events.append(.{.event = event}); |
| 69 | c.yaml_event_delete(&event); |
| 70 | |
| 71 | if (et == c.YAML_STREAM_END_EVENT) { |
| 72 | break; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | c.yaml_parser_delete(&parser); |
| 77 | |
| 78 | var l: usize = all_events.items.len; |
| 79 | while (true) { |
| 80 | try condense_event_list(&all_events, lines); |
| 81 | if (l == all_events.items.len) { |
| 82 | break; |
| 83 | } |
| 84 | l = all_events.items.len; |
| 85 | } |
| 86 | |
| 87 | std.debug.assert(all_events.items.len == 1); |
| 88 | return all_events.items[0].document; |
| 89 | } |
| 90 | |
| 91 | fn get_event_string(event: c.yaml_event_t, lines: Array) []const u8 { |
| 92 | const sm = event.start_mark; |
| 93 | const em = event.end_mark; |
| 94 | return lines[sm.line][sm.column..em.column]; |
| 95 | } |
| 96 | |
| 97 | fn condense_event_list(list: *std.ArrayList(Item), lines: Array) !void { |
| 98 | var i: usize = 0; |
| 99 | var new_list = std.ArrayList(Item).init(list.allocator); |
| 100 | |
| 101 | while (i < list.items.len) : (i += 1) { |
| 102 | if (try condense_event_list_key(list.items, i, &new_list, lines)) |len| { |
| 103 | i += len; |
| 104 | continue; |
| 105 | } |
| 106 | if (try condense_event_list_mapping(list.items, i, &new_list, lines)) |len| { |
| 107 | i += len; |
| 108 | continue; |
| 109 | } |
| 110 | if (try condense_event_list_sequence(list.items, i, &new_list, lines)) |len| { |
| 111 | i += len; |
| 112 | continue; |
| 113 | } |
| 114 | if (try condense_event_list_document(list.items, i, &new_list, lines)) |len| { |
| 115 | i += len; |
| 116 | continue; |
| 117 | } |
| 118 | try new_list.append(list.items[i]); |
| 119 | } |
| 120 | |
| 121 | list.* = new_list; |
| 122 | } |
| 123 | |
| 124 | fn condense_event_list_key(from: []Item, at: usize, to: *std.ArrayList(Item), lines: Array) !?usize { |
| 125 | if (at >= from.len-1) { |
| 126 | return null; |
| 127 | } |
| 128 | const t = from[at]; |
| 129 | const n = from[at+1]; |
| 130 | |
| 131 | if (!(t == .event and @enumToInt(t.event.type) == c.YAML_SCALAR_EVENT)) { |
| 132 | return null; |
| 133 | } |
| 134 | if (n == .event and @enumToInt(n.event.type) == c.YAML_SCALAR_EVENT) { |
| 135 | try to.append(Item{ |
| 136 | .kv = Key{ |
| 137 | .key = get_event_string(t.event, lines), |
| 138 | .value = Value{ .string = get_event_string(n.event, lines) }, |
| 139 | }, |
| 140 | }); |
| 141 | return 0+2-1; |
| 142 | } |
| 143 | if (n == .sequence) { |
| 144 | try to.append(Item{ |
| 145 | .kv = Key{ |
| 146 | .key = get_event_string(t.event, lines), |
| 147 | .value = Value{ .sequence = n.sequence }, |
| 148 | }, |
| 149 | }); |
| 150 | return 0+2-1; |
| 151 | } |
| 152 | return null; |
| 153 | } |
| 154 | |
| 155 | fn condense_event_list_mapping(from: []Item, at: usize, to: *std.ArrayList(Item), lines: Array) !?usize { |
| 156 | if (!(from[at] == .event and @enumToInt(from[at].event.type) == c.YAML_MAPPING_START_EVENT)) { |
| 157 | return null; |
| 158 | } |
| 159 | var i: usize = 1; |
| 160 | while (true) : (i += 1) { |
| 161 | const ele = from[at+i]; |
| 162 | if (ele == .event and @enumToInt(ele.event.type) == c.YAML_MAPPING_END_EVENT) { |
| 163 | break; |
| 164 | } |
| 165 | if (ele == .event) { |
| 166 | return null; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | const keys = &std.ArrayList(Key).init(to.allocator); |
| 171 | for (from[at+1..at+i]) |item| { |
| 172 | switch (item) { |
| 173 | .kv => { |
| 174 | try keys.append(item.kv); |
| 175 | }, |
| 176 | else => unreachable, |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | try to.append(Item{ |
| 181 | .mapping = Mapping{ .items = keys.items }, |
| 182 | }); |
| 183 | return 0+i; |
| 184 | } |
| 185 | |
| 186 | fn condense_event_list_sequence(from: []Item, at: usize, to: *std.ArrayList(Item), lines: Array) !?usize { |
| 187 | if (!(from[at] == .event and @enumToInt(from[at].event.type) == c.YAML_SEQUENCE_START_EVENT)) { |
| 188 | return null; |
| 189 | } |
| 190 | var i: usize = 1; |
| 191 | while (true) : (i += 1) { |
| 192 | const ele = from[at+i]; |
| 193 | if (ele == .event and @enumToInt(ele.event.type) == c.YAML_SEQUENCE_END_EVENT) { |
| 194 | break; |
| 195 | } |
| 196 | if (ele == .event) { |
| 197 | return null; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | const result = from[at+1..at+i]; |
| 202 | for (result) |item| { |
| 203 | std.debug.assert(item == .mapping); |
| 204 | } |
| 205 | try to.append(Item{ |
| 206 | .sequence = result, |
| 207 | }); |
| 208 | return 0+i; |
| 209 | } |
| 210 | |
| 211 | fn condense_event_list_document(from: []Item, at: usize, to: *std.ArrayList(Item), lines: Array) !?usize { |
| 212 | if (from.len < at+4) { |
| 213 | return null; |
| 214 | } |
| 215 | if (!(from[at] == .event and @enumToInt(from[at].event.type) == c.YAML_STREAM_START_EVENT)) { |
| 216 | return null; |
| 217 | } |
| 218 | if (!(from[at+1] == .event and @enumToInt(from[at+1].event.type) == c.YAML_DOCUMENT_START_EVENT)) { |
| 219 | return null; |
| 220 | } |
| 221 | if (!(from[at+2] == .mapping)) { |
| 222 | return null; |
| 223 | } |
| 224 | if (!(from[at+3] == .event and @enumToInt(from[at+3].event.type) == c.YAML_DOCUMENT_END_EVENT)) { |
| 225 | return null; |
| 226 | } |
| 227 | if (!(from[at+4] == .event and @enumToInt(from[at+4].event.type) == c.YAML_STREAM_END_EVENT)) { |
| 228 | return null; |
| 229 | } |
| 230 | try to.append(Item{ |
| 231 | .document = Document{ |
| 232 | .mapping = from[at+2].mapping, |
| 233 | }, |
| 234 | }); |
| 235 | return 0+5-1; |
| 236 | } |
Meghan <hello@nektro.net> 2020-11-14 02:11:27 -08:00