summaryrefslogtreecommitdiff
path: root/indexing/zhmakeindex/input.go
blob: 6abb905a1ca0429d2ebb065fd1da7f4b0f02ec04 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
package main

import (
	"errors"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"unicode"

	"golang.org/x/text/transform"

	"github.com/yasushi-saito/rbtree"
)

type InputIndex []IndexEntry

func NewInputIndex(option *InputOptions, style *InputStyle) *InputIndex {
	inset := rbtree.NewTree(CompareIndexEntry)

	if option.stdin {
		readIdxFile(inset, os.Stdin, option, style)
	} else {
		for _, idxname := range option.input {
			// 文件不存在且无后缀时,加上默认后缀 .idx 再试
			if _, err := os.Stat(idxname); os.IsNotExist(err) && filepath.Ext(idxname) == "" {
				idxname = idxname + ".idx"
			}
			idxfile, err := os.Open(idxname)
			if err != nil {
				log.Fatalln(err.Error())
			}
			readIdxFile(inset, idxfile, option, style)
			idxfile.Close()
		}
	}

	var in InputIndex
	for iter := inset.Min(); !iter.Limit(); iter = iter.Next() {
		pentry := iter.Item().(*IndexEntry)
		in = append(in, *pentry)
	}
	return &in
}

func readIdxFile(inset *rbtree.Tree, idxfile *os.File, option *InputOptions, style *InputStyle) {
	log.Printf("读取输入文件 %s ……\n", idxfile.Name())
	accepted, rejected := 0, 0

	idxreader := NewNumberdReader(transform.NewReader(idxfile, option.decoder))
	for {
		entry, err := ScanIndexEntry(idxreader, option, style)
		if err == io.EOF {
			break
		} else if err == ScanSyntaxError {
			rejected++
			log.Printf("%s:%d: %s\n", idxfile.Name(), idxreader.Line(), err.Error())
			// 跳过一行
			if err := idxreader.SkipLine(); err == io.EOF {
				break
			} else if err != nil {
				log.Fatalln(err.Error())
			}
		} else if err != nil {
			log.Fatalln(err.Error())
		} else {
			accepted++
			if old := inset.Get(entry); old != nil {
				oldentry := old.(*IndexEntry)
				oldentry.pagelist = append(oldentry.pagelist, entry.pagelist...)
			} else {
				// entry 不在集合 inset 中时,插入 entry 本身和所有祖先节点,祖先不含页码
				for len(entry.level) > 0 {
					inset.Insert(entry)
					parent := &IndexEntry{
						level:    entry.level[:len(entry.level)-1],
						pagelist: nil,
					}
					if inset.Get(parent) != nil {
						break
					} else {
						entry = parent
					}
				}
			}
		}
	}
	log.Printf("接受 %d 项,拒绝 %d 项。\n", accepted, rejected)
}

// 跳过空白符和行注释
func skipspaces(reader *NumberdReader, style *InputStyle) error {
	for {
		r, _, err := reader.ReadRune()
		if err != nil {
			return err
		} else if r == style.comment { // 注释以 style.comment 开头,直至行末
			reader.SkipLine()
		} else if !unicode.IsSpace(r) {
			reader.UnreadRune()
			break
		}
	}
	return nil
}

func ScanIndexEntry(reader *NumberdReader, option *InputOptions, style *InputStyle) (*IndexEntry, error) {
	var entry IndexEntry
	page := new(Page)
	// 跳过空白符
	if err := skipspaces(reader, style); err != nil {
		return nil, err
	}
	// 跳过 keyword
	for _, r := range style.keyword {
		new_r, _, err := reader.ReadRune()
		if err != nil {
			return nil, err
		}
		if new_r != r {
			return nil, ScanSyntaxError
		}
	}
	// 跳过空白符
	if err := skipspaces(reader, style); err != nil {
		return nil, err
	}
	// 自动机状态
	const (
		SCAN_OPEN = iota
		SCAN_KEY
		SCAN_VALUE
		SCAN_COMMAND
		SCAN_PAGE
		SCAN_PAGERANGE
	)
	// 从 arg_open 开始扫描到 arg_close,处理索引项
	state := SCAN_OPEN
	quoted := false
	escaped := false
	arg_depth := 0
	var token []rune
	var entry_input []rune
	page.rangetype = PAGE_NORMAL
L_scan_kv:
	for {
		r, _, err := reader.ReadRune()
		entry_input = append(entry_input, r)
		if err != nil {
			return nil, err
		}
		//debug.Printf("字符 %2c, 状态 %d, quoted %5v, escaped %5v, arg_depth %d\n", r, state, quoted, escaped, arg_depth) //// DEBUG only
		switch state {
		case SCAN_OPEN:
			if !quoted && r == style.arg_open {
				state = SCAN_KEY
			} else {
				return nil, ScanSyntaxError
			}
		case SCAN_KEY:
			push_keyval := func(next int) {
				str := string(token)
				if option.compress {
					str = strings.TrimSpace(str)
				}
				entry.level = append(entry.level, IndexEntryLevel{key: str, text: str})
				token = nil
				state = next
			}
			if quoted {
				token = append(token, r)
				quoted = false
				break
			} else if r == style.arg_open && !escaped {
				token = append(token, r)
				arg_depth++
			} else if r == style.arg_close && !escaped {
				if arg_depth == 0 {
					push_keyval(0)
					break L_scan_kv
				} else {
					token = append(token, r)
					arg_depth--
				}
			} else if r == style.actual {
				push_keyval(SCAN_VALUE)
			} else if r == style.encap {
				push_keyval(SCAN_PAGERANGE)
			} else if r == style.level {
				push_keyval(SCAN_KEY)
			} else if r == style.quote && !escaped {
				quoted = true
			} else {
				token = append(token, r)
			}
			if r == style.escape {
				escaped = true
			} else {
				escaped = false
			}
		case SCAN_VALUE:
			set_value := func(next int) {
				str := string(token)
				entry.level[len(entry.level)-1].text = str
				token = nil
				state = next
			}
			// 暂不对 actual 特殊处理
			if quoted {
				token = append(token, r)
				quoted = false
				break
			} else if r == style.arg_open && !escaped {
				token = append(token, r)
				arg_depth++
			} else if r == style.arg_close && !escaped {
				if arg_depth == 0 {
					set_value(0)
					break L_scan_kv
				} else {
					token = append(token, r)
					arg_depth--
				}
			} else if r == style.encap {
				set_value(SCAN_PAGERANGE)
			} else if r == style.level {
				set_value(SCAN_KEY)
			} else if r == style.quote && !escaped {
				quoted = true
			} else {
				token = append(token, r)
			}
			if r == style.escape {
				escaped = true
			} else {
				escaped = false
			}
		case SCAN_PAGERANGE:
			if quoted {
				token = append(token, r)
				quoted = false
				break
			} else if r == style.arg_open || r == style.arg_close || r == style.actual || r == style.encap || r == style.level {
				// 注意 encap 符号后不能直接加 arg_open、arg_close 等符号
				return nil, ScanSyntaxError
			} else if r == style.range_open {
				page.rangetype = PAGE_OPEN
			} else if r == style.range_close {
				page.rangetype = PAGE_CLOSE
			} else if r == style.quote { // 之前是 encap,无须考虑被 escape 转义
				quoted = true
			} else {
				token = append(token, r)
			}
			state = SCAN_COMMAND
			if r == style.escape {
				escaped = true
			} else {
				escaped = false
			}
		case SCAN_COMMAND:
			// 不对 encap、actual、level 特殊处理
			if quoted {
				token = append(token, r)
				quoted = false
				break
			} else if r == style.arg_open && !escaped {
				token = append(token, r)
				arg_depth++
			} else if r == style.arg_close && !escaped {
				if arg_depth == 0 {
					page.encap = string(token)
					break L_scan_kv
				} else {
					token = append(token, r)
					arg_depth--
				}
			} else if r == style.quote && !escaped {
				quoted = true
			} else {
				token = append(token, r)
			}
			if r == style.escape {
				escaped = true
			} else {
				escaped = false
			}
		default:
			panic("扫描状态错误")
		}
	}
	entry.input = string(entry_input)
	// 跳过空白符
	if err := skipspaces(reader, style); err != nil {
		return nil, err
	}
	// 从 arg_open 开始扫描到 arg_close,处理页码
	state = SCAN_OPEN
	token = nil
L_scan_page:
	for {
		r, _, err := reader.ReadRune()
		if err != nil {
			return nil, err
		}
		// debug.Printf("字符 %c, 状态 %d\n", r, state) //// DEBUG only
		switch state {
		case SCAN_OPEN:
			if r == style.arg_open {
				state = SCAN_PAGE
			} else {
				return nil, ScanSyntaxError
			}
		case SCAN_PAGE:
			if r == style.arg_close {
				page.numbers, err = scanPage(token, style.page_compositor)
				if err != nil {
					return nil, err
				}
				break L_scan_page
			} else if r == style.arg_open {
				return nil, ScanSyntaxError
			} else {
				token = append(token, r)
			}
		default:
			panic("扫描状态错误")
		}
		// 未实现对 style.page_compositor 的处理
	}
	page.compositor = style.page_compositor
	entry.pagelist = append(entry.pagelist, page)
	// debug.Println(entry) //// DEBUG only
	return &entry, nil
}

var ScanSyntaxError = errors.New("索引项语法错误")

type IndexEntry struct {
	input    string
	level    []IndexEntryLevel
	pagelist []*Page
}

// 实现 rbtree.CompareFunc
func CompareIndexEntry(a, b rbtree.Item) int {
	x := a.(*IndexEntry)
	y := b.(*IndexEntry)
	for i := range x.level {
		if i >= len(y.level) {
			return 1
		}
		if x.level[i].key < y.level[i].key {
			return -1
		} else if x.level[i].key > y.level[i].key {
			return 1
		}
		if x.level[i].text < y.level[i].text {
			return -1
		} else if x.level[i].text > y.level[i].text {
			return 1
		}
	}
	if len(x.level) < len(y.level) {
		return -1
	}
	return 0
}

// 一条索引条目中的一级
type IndexEntryLevel struct {
	key  string
	text string
}

type RangeType int

const (
	PAGE_UNKNOWN RangeType = iota
	PAGE_OPEN
	PAGE_NORMAL
	PAGE_CLOSE
)

func (rt RangeType) String() string {
	switch rt {
	case PAGE_UNKNOWN:
		return "?"
	case PAGE_OPEN:
		return "("
	case PAGE_NORMAL:
		return "."
	case PAGE_CLOSE:
		return ")"
	default:
		panic("区间格式错误")
	}
}