diff options
Diffstat (limited to 'vendor/golang.org/x/text/internal/triegen')
| -rw-r--r-- | vendor/golang.org/x/text/internal/triegen/compact.go | 58 | ||||
| -rw-r--r-- | vendor/golang.org/x/text/internal/triegen/print.go | 251 | ||||
| -rw-r--r-- | vendor/golang.org/x/text/internal/triegen/triegen.go | 494 |
3 files changed, 803 insertions, 0 deletions
diff --git a/vendor/golang.org/x/text/internal/triegen/compact.go b/vendor/golang.org/x/text/internal/triegen/compact.go new file mode 100644 index 0000000..397b975 --- /dev/null +++ b/vendor/golang.org/x/text/internal/triegen/compact.go @@ -0,0 +1,58 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package triegen + +// This file defines Compacter and its implementations. + +import "io" + +// A Compacter generates an alternative, more space-efficient way to store a +// trie value block. A trie value block holds all possible values for the last +// byte of a UTF-8 encoded rune. Excluding ASCII characters, a trie value block +// always has 64 values, as a UTF-8 encoding ends with a byte in [0x80, 0xC0). +type Compacter interface { + // Size returns whether the Compacter could encode the given block as well + // as its size in case it can. len(v) is always 64. + Size(v []uint64) (sz int, ok bool) + + // Store stores the block using the Compacter's compression method. + // It returns a handle with which the block can be retrieved. + // len(v) is always 64. + Store(v []uint64) uint32 + + // Print writes the data structures associated to the given store to w. + Print(w io.Writer) error + + // Handler returns the name of a function that gets called during trie + // lookup for blocks generated by the Compacter. The function should be of + // the form func (n uint32, b byte) uint64, where n is the index returned by + // the Compacter's Store method and b is the last byte of the UTF-8 + // encoding, where 0x80 <= b < 0xC0, for which to do the lookup in the + // block. + Handler() string +} + +// simpleCompacter is the default Compacter used by builder. It implements a +// normal trie block. +type simpleCompacter builder + +func (b *simpleCompacter) Size([]uint64) (sz int, ok bool) { + return blockSize * b.ValueSize, true +} + +func (b *simpleCompacter) Store(v []uint64) uint32 { + h := uint32(len(b.ValueBlocks) - blockOffset) + b.ValueBlocks = append(b.ValueBlocks, v) + return h +} + +func (b *simpleCompacter) Print(io.Writer) error { + // Structures are printed in print.go. + return nil +} + +func (b *simpleCompacter) Handler() string { + panic("Handler should be special-cased for this Compacter") +} diff --git a/vendor/golang.org/x/text/internal/triegen/print.go b/vendor/golang.org/x/text/internal/triegen/print.go new file mode 100644 index 0000000..8d9f120 --- /dev/null +++ b/vendor/golang.org/x/text/internal/triegen/print.go @@ -0,0 +1,251 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package triegen + +import ( + "bytes" + "fmt" + "io" + "strings" + "text/template" +) + +// print writes all the data structures as well as the code necessary to use the +// trie to w. +func (b *builder) print(w io.Writer) error { + b.Stats.NValueEntries = len(b.ValueBlocks) * blockSize + b.Stats.NValueBytes = len(b.ValueBlocks) * blockSize * b.ValueSize + b.Stats.NIndexEntries = len(b.IndexBlocks) * blockSize + b.Stats.NIndexBytes = len(b.IndexBlocks) * blockSize * b.IndexSize + b.Stats.NHandleBytes = len(b.Trie) * 2 * b.IndexSize + + // If we only have one root trie, all starter blocks are at position 0 and + // we can access the arrays directly. + if len(b.Trie) == 1 { + // At this point we cannot refer to the generated tables directly. + b.ASCIIBlock = b.Name + "Values" + b.StarterBlock = b.Name + "Index" + } else { + // Otherwise we need to have explicit starter indexes in the trie + // structure. + b.ASCIIBlock = "t.ascii" + b.StarterBlock = "t.utf8Start" + } + + b.SourceType = "[]byte" + if err := lookupGen.Execute(w, b); err != nil { + return err + } + + b.SourceType = "string" + if err := lookupGen.Execute(w, b); err != nil { + return err + } + + if err := trieGen.Execute(w, b); err != nil { + return err + } + + for _, c := range b.Compactions { + if err := c.c.Print(w); err != nil { + return err + } + } + + return nil +} + +func printValues(n int, values []uint64) string { + w := &bytes.Buffer{} + boff := n * blockSize + fmt.Fprintf(w, "\t// Block %#x, offset %#x", n, boff) + var newline bool + for i, v := range values { + if i%6 == 0 { + newline = true + } + if v != 0 { + if newline { + fmt.Fprintf(w, "\n") + newline = false + } + fmt.Fprintf(w, "\t%#02x:%#04x, ", boff+i, v) + } + } + return w.String() +} + +func printIndex(b *builder, nr int, n *node) string { + w := &bytes.Buffer{} + boff := nr * blockSize + fmt.Fprintf(w, "\t// Block %#x, offset %#x", nr, boff) + var newline bool + for i, c := range n.children { + if i%8 == 0 { + newline = true + } + if c != nil { + v := b.Compactions[c.index.compaction].Offset + uint32(c.index.index) + if v != 0 { + if newline { + fmt.Fprintf(w, "\n") + newline = false + } + fmt.Fprintf(w, "\t%#02x:%#02x, ", boff+i, v) + } + } + } + return w.String() +} + +var ( + trieGen = template.Must(template.New("trie").Funcs(template.FuncMap{ + "printValues": printValues, + "printIndex": printIndex, + "title": strings.Title, + "dec": func(x int) int { return x - 1 }, + "psize": func(n int) string { + return fmt.Sprintf("%d bytes (%.2f KiB)", n, float64(n)/1024) + }, + }).Parse(trieTemplate)) + lookupGen = template.Must(template.New("lookup").Parse(lookupTemplate)) +) + +// TODO: consider the return type of lookup. It could be uint64, even if the +// internal value type is smaller. We will have to verify this with the +// performance of unicode/norm, which is very sensitive to such changes. +const trieTemplate = `{{$b := .}}{{$multi := gt (len .Trie) 1}} +// {{.Name}}Trie. Total size: {{psize .Size}}. Checksum: {{printf "%08x" .Checksum}}. +type {{.Name}}Trie struct { {{if $multi}} + ascii []{{.ValueType}} // index for ASCII bytes + utf8Start []{{.IndexType}} // index for UTF-8 bytes >= 0xC0 +{{end}}} + +func new{{title .Name}}Trie(i int) *{{.Name}}Trie { {{if $multi}} + h := {{.Name}}TrieHandles[i] + return &{{.Name}}Trie{ {{.Name}}Values[uint32(h.ascii)<<6:], {{.Name}}Index[uint32(h.multi)<<6:] } +} + +type {{.Name}}TrieHandle struct { + ascii, multi {{.IndexType}} +} + +// {{.Name}}TrieHandles: {{len .Trie}} handles, {{.Stats.NHandleBytes}} bytes +var {{.Name}}TrieHandles = [{{len .Trie}}]{{.Name}}TrieHandle{ +{{range .Trie}} { {{.ASCIIIndex}}, {{.StarterIndex}} }, // {{printf "%08x" .Checksum}}: {{.Name}} +{{end}}}{{else}} + return &{{.Name}}Trie{} +} +{{end}} +// lookupValue determines the type of block n and looks up the value for b. +func (t *{{.Name}}Trie) lookupValue(n uint32, b byte) {{.ValueType}}{{$last := dec (len .Compactions)}} { + switch { {{range $i, $c := .Compactions}} + {{if eq $i $last}}default{{else}}case n < {{$c.Cutoff}}{{end}}:{{if ne $i 0}} + n -= {{$c.Offset}}{{end}} + return {{print $b.ValueType}}({{$c.Handler}}){{end}} + } +} + +// {{.Name}}Values: {{len .ValueBlocks}} blocks, {{.Stats.NValueEntries}} entries, {{.Stats.NValueBytes}} bytes +// The third block is the zero block. +var {{.Name}}Values = [{{.Stats.NValueEntries}}]{{.ValueType}} { +{{range $i, $v := .ValueBlocks}}{{printValues $i $v}} +{{end}}} + +// {{.Name}}Index: {{len .IndexBlocks}} blocks, {{.Stats.NIndexEntries}} entries, {{.Stats.NIndexBytes}} bytes +// Block 0 is the zero block. +var {{.Name}}Index = [{{.Stats.NIndexEntries}}]{{.IndexType}} { +{{range $i, $v := .IndexBlocks}}{{printIndex $b $i $v}} +{{end}}} +` + +// TODO: consider allowing zero-length strings after evaluating performance with +// unicode/norm. +const lookupTemplate = ` +// lookup{{if eq .SourceType "string"}}String{{end}} returns the trie value for the first UTF-8 encoding in s and +// the width in bytes of this encoding. The size will be 0 if s does not +// hold enough bytes to complete the encoding. len(s) must be greater than 0. +func (t *{{.Name}}Trie) lookup{{if eq .SourceType "string"}}String{{end}}(s {{.SourceType}}) (v {{.ValueType}}, sz int) { + c0 := s[0] + switch { + case c0 < 0x80: // is ASCII + return {{.ASCIIBlock}}[c0], 1 + case c0 < 0xC2: + return 0, 1 // Illegal UTF-8: not a starter, not ASCII. + case c0 < 0xE0: // 2-byte UTF-8 + if len(s) < 2 { + return 0, 0 + } + i := {{.StarterBlock}}[c0] + c1 := s[1] + if c1 < 0x80 || 0xC0 <= c1 { + return 0, 1 // Illegal UTF-8: not a continuation byte. + } + return t.lookupValue(uint32(i), c1), 2 + case c0 < 0xF0: // 3-byte UTF-8 + if len(s) < 3 { + return 0, 0 + } + i := {{.StarterBlock}}[c0] + c1 := s[1] + if c1 < 0x80 || 0xC0 <= c1 { + return 0, 1 // Illegal UTF-8: not a continuation byte. + } + o := uint32(i)<<6 + uint32(c1) + i = {{.Name}}Index[o] + c2 := s[2] + if c2 < 0x80 || 0xC0 <= c2 { + return 0, 2 // Illegal UTF-8: not a continuation byte. + } + return t.lookupValue(uint32(i), c2), 3 + case c0 < 0xF8: // 4-byte UTF-8 + if len(s) < 4 { + return 0, 0 + } + i := {{.StarterBlock}}[c0] + c1 := s[1] + if c1 < 0x80 || 0xC0 <= c1 { + return 0, 1 // Illegal UTF-8: not a continuation byte. + } + o := uint32(i)<<6 + uint32(c1) + i = {{.Name}}Index[o] + c2 := s[2] + if c2 < 0x80 || 0xC0 <= c2 { + return 0, 2 // Illegal UTF-8: not a continuation byte. + } + o = uint32(i)<<6 + uint32(c2) + i = {{.Name}}Index[o] + c3 := s[3] + if c3 < 0x80 || 0xC0 <= c3 { + return 0, 3 // Illegal UTF-8: not a continuation byte. + } + return t.lookupValue(uint32(i), c3), 4 + } + // Illegal rune + return 0, 1 +} + +// lookup{{if eq .SourceType "string"}}String{{end}}Unsafe returns the trie value for the first UTF-8 encoding in s. +// s must start with a full and valid UTF-8 encoded rune. +func (t *{{.Name}}Trie) lookup{{if eq .SourceType "string"}}String{{end}}Unsafe(s {{.SourceType}}) {{.ValueType}} { + c0 := s[0] + if c0 < 0x80 { // is ASCII + return {{.ASCIIBlock}}[c0] + } + i := {{.StarterBlock}}[c0] + if c0 < 0xE0 { // 2-byte UTF-8 + return t.lookupValue(uint32(i), s[1]) + } + i = {{.Name}}Index[uint32(i)<<6+uint32(s[1])] + if c0 < 0xF0 { // 3-byte UTF-8 + return t.lookupValue(uint32(i), s[2]) + } + i = {{.Name}}Index[uint32(i)<<6+uint32(s[2])] + if c0 < 0xF8 { // 4-byte UTF-8 + return t.lookupValue(uint32(i), s[3]) + } + return 0 +} +` diff --git a/vendor/golang.org/x/text/internal/triegen/triegen.go b/vendor/golang.org/x/text/internal/triegen/triegen.go new file mode 100644 index 0000000..adb0108 --- /dev/null +++ b/vendor/golang.org/x/text/internal/triegen/triegen.go @@ -0,0 +1,494 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package triegen implements a code generator for a trie for associating +// unsigned integer values with UTF-8 encoded runes. +// +// Many of the go.text packages use tries for storing per-rune information. A +// trie is especially useful if many of the runes have the same value. If this +// is the case, many blocks can be expected to be shared allowing for +// information on many runes to be stored in little space. +// +// As most of the lookups are done directly on []byte slices, the tries use the +// UTF-8 bytes directly for the lookup. This saves a conversion from UTF-8 to +// runes and contributes a little bit to better performance. It also naturally +// provides a fast path for ASCII. +// +// Space is also an issue. There are many code points defined in Unicode and as +// a result tables can get quite large. So every byte counts. The triegen +// package automatically chooses the smallest integer values to represent the +// tables. Compacters allow further compression of the trie by allowing for +// alternative representations of individual trie blocks. +// +// triegen allows generating multiple tries as a single structure. This is +// useful when, for example, one wants to generate tries for several languages +// that have a lot of values in common. Some existing libraries for +// internationalization store all per-language data as a dynamically loadable +// chunk. The go.text packages are designed with the assumption that the user +// typically wants to compile in support for all supported languages, in line +// with the approach common to Go to create a single standalone binary. The +// multi-root trie approach can give significant storage savings in this +// scenario. +// +// triegen generates both tables and code. The code is optimized to use the +// automatically chosen data types. The following code is generated for a Trie +// or multiple Tries named "foo": +// - type fooTrie +// The trie type. +// +// - func newFooTrie(x int) *fooTrie +// Trie constructor, where x is the index of the trie passed to Gen. +// +// - func (t *fooTrie) lookup(s []byte) (v uintX, sz int) +// The lookup method, where uintX is automatically chosen. +// +// - func lookupString, lookupUnsafe and lookupStringUnsafe +// Variants of the above. +// +// - var fooValues and fooIndex and any tables generated by Compacters. +// The core trie data. +// +// - var fooTrieHandles +// Indexes of starter blocks in case of multiple trie roots. +// +// It is recommended that users test the generated trie by checking the returned +// value for every rune. Such exhaustive tests are possible as the the number of +// runes in Unicode is limited. +package triegen // import "golang.org/x/text/internal/triegen" + +// TODO: Arguably, the internally optimized data types would not have to be +// exposed in the generated API. We could also investigate not generating the +// code, but using it through a package. We would have to investigate the impact +// on performance of making such change, though. For packages like unicode/norm, +// small changes like this could tank performance. + +import ( + "encoding/binary" + "fmt" + "hash/crc64" + "io" + "log" + "unicode/utf8" +) + +// builder builds a set of tries for associating values with runes. The set of +// tries can share common index and value blocks. +type builder struct { + Name string + + // ValueType is the type of the trie values looked up. + ValueType string + + // ValueSize is the byte size of the ValueType. + ValueSize int + + // IndexType is the type of trie index values used for all UTF-8 bytes of + // a rune except the last one. + IndexType string + + // IndexSize is the byte size of the IndexType. + IndexSize int + + // SourceType is used when generating the lookup functions. If the user + // requests StringSupport, all lookup functions will be generated for + // string input as well. + SourceType string + + Trie []*Trie + + IndexBlocks []*node + ValueBlocks [][]uint64 + Compactions []compaction + Checksum uint64 + + ASCIIBlock string + StarterBlock string + + indexBlockIdx map[uint64]int + valueBlockIdx map[uint64]nodeIndex + asciiBlockIdx map[uint64]int + + // Stats are used to fill out the template. + Stats struct { + NValueEntries int + NValueBytes int + NIndexEntries int + NIndexBytes int + NHandleBytes int + } + + err error +} + +// A nodeIndex encodes the index of a node, which is defined by the compaction +// which stores it and an index within the compaction. For internal nodes, the +// compaction is always 0. +type nodeIndex struct { + compaction int + index int +} + +// compaction keeps track of stats used for the compaction. +type compaction struct { + c Compacter + blocks []*node + maxHandle uint32 + totalSize int + + // Used by template-based generator and thus exported. + Cutoff uint32 + Offset uint32 + Handler string +} + +func (b *builder) setError(err error) { + if b.err == nil { + b.err = err + } +} + +// An Option can be passed to Gen. +type Option func(b *builder) error + +// Compact configures the trie generator to use the given Compacter. +func Compact(c Compacter) Option { + return func(b *builder) error { + b.Compactions = append(b.Compactions, compaction{ + c: c, + Handler: c.Handler() + "(n, b)"}) + return nil + } +} + +// Gen writes Go code for a shared trie lookup structure to w for the given +// Tries. The generated trie type will be called nameTrie. newNameTrie(x) will +// return the *nameTrie for tries[x]. A value can be looked up by using one of +// the various lookup methods defined on nameTrie. It returns the table size of +// the generated trie. +func Gen(w io.Writer, name string, tries []*Trie, opts ...Option) (sz int, err error) { + // The index contains two dummy blocks, followed by the zero block. The zero + // block is at offset 0x80, so that the offset for the zero block for + // continuation bytes is 0. + b := &builder{ + Name: name, + Trie: tries, + IndexBlocks: []*node{{}, {}, {}}, + Compactions: []compaction{{ + Handler: name + "Values[n<<6+uint32(b)]", + }}, + // The 0 key in indexBlockIdx and valueBlockIdx is the hash of the zero + // block. + indexBlockIdx: map[uint64]int{0: 0}, + valueBlockIdx: map[uint64]nodeIndex{0: {}}, + asciiBlockIdx: map[uint64]int{}, + } + b.Compactions[0].c = (*simpleCompacter)(b) + + for _, f := range opts { + if err := f(b); err != nil { + return 0, err + } + } + b.build() + if b.err != nil { + return 0, b.err + } + if err = b.print(w); err != nil { + return 0, err + } + return b.Size(), nil +} + +// A Trie represents a single root node of a trie. A builder may build several +// overlapping tries at once. +type Trie struct { + root *node + + hiddenTrie +} + +// hiddenTrie contains values we want to be visible to the template generator, +// but hidden from the API documentation. +type hiddenTrie struct { + Name string + Checksum uint64 + ASCIIIndex int + StarterIndex int +} + +// NewTrie returns a new trie root. +func NewTrie(name string) *Trie { + return &Trie{ + &node{ + children: make([]*node, blockSize), + values: make([]uint64, utf8.RuneSelf), + }, + hiddenTrie{Name: name}, + } +} + +// Gen is a convenience wrapper around the Gen func passing t as the only trie +// and uses the name passed to NewTrie. It returns the size of the generated +// tables. +func (t *Trie) Gen(w io.Writer, opts ...Option) (sz int, err error) { + return Gen(w, t.Name, []*Trie{t}, opts...) +} + +// node is a node of the intermediate trie structure. +type node struct { + // children holds this node's children. It is always of length 64. + // A child node may be nil. + children []*node + + // values contains the values of this node. If it is non-nil, this node is + // either a root or leaf node: + // For root nodes, len(values) == 128 and it maps the bytes in [0x00, 0x7F]. + // For leaf nodes, len(values) == 64 and it maps the bytes in [0x80, 0xBF]. + values []uint64 + + index nodeIndex +} + +// Insert associates value with the given rune. Insert will panic if a non-zero +// value is passed for an invalid rune. +func (t *Trie) Insert(r rune, value uint64) { + if value == 0 { + return + } + s := string(r) + if []rune(s)[0] != r && value != 0 { + // Note: The UCD tables will always assign what amounts to a zero value + // to a surrogate. Allowing a zero value for an illegal rune allows + // users to iterate over [0..MaxRune] without having to explicitly + // exclude surrogates, which would be tedious. + panic(fmt.Sprintf("triegen: non-zero value for invalid rune %U", r)) + } + if len(s) == 1 { + // It is a root node value (ASCII). + t.root.values[s[0]] = value + return + } + + n := t.root + for ; len(s) > 1; s = s[1:] { + if n.children == nil { + n.children = make([]*node, blockSize) + } + p := s[0] % blockSize + c := n.children[p] + if c == nil { + c = &node{} + n.children[p] = c + } + if len(s) > 2 && c.values != nil { + log.Fatalf("triegen: insert(%U): found internal node with values", r) + } + n = c + } + if n.values == nil { + n.values = make([]uint64, blockSize) + } + if n.children != nil { + log.Fatalf("triegen: insert(%U): found leaf node that also has child nodes", r) + } + n.values[s[0]-0x80] = value +} + +// Size returns the number of bytes the generated trie will take to store. It +// needs to be exported as it is used in the templates. +func (b *builder) Size() int { + // Index blocks. + sz := len(b.IndexBlocks) * blockSize * b.IndexSize + + // Skip the first compaction, which represents the normal value blocks, as + // its totalSize does not account for the ASCII blocks, which are managed + // separately. + sz += len(b.ValueBlocks) * blockSize * b.ValueSize + for _, c := range b.Compactions[1:] { + sz += c.totalSize + } + + // TODO: this computation does not account for the fixed overhead of a using + // a compaction, either code or data. As for data, though, the typical + // overhead of data is in the order of bytes (2 bytes for cases). Further, + // the savings of using a compaction should anyway be substantial for it to + // be worth it. + + // For multi-root tries, we also need to account for the handles. + if len(b.Trie) > 1 { + sz += 2 * b.IndexSize * len(b.Trie) + } + return sz +} + +func (b *builder) build() { + // Compute the sizes of the values. + var vmax uint64 + for _, t := range b.Trie { + vmax = maxValue(t.root, vmax) + } + b.ValueType, b.ValueSize = getIntType(vmax) + + // Compute all block allocations. + // TODO: first compute the ASCII blocks for all tries and then the other + // nodes. ASCII blocks are more restricted in placement, as they require two + // blocks to be placed consecutively. Processing them first may improve + // sharing (at least one zero block can be expected to be saved.) + for _, t := range b.Trie { + b.Checksum += b.buildTrie(t) + } + + // Compute the offsets for all the Compacters. + offset := uint32(0) + for i := range b.Compactions { + c := &b.Compactions[i] + c.Offset = offset + offset += c.maxHandle + 1 + c.Cutoff = offset + } + + // Compute the sizes of indexes. + // TODO: different byte positions could have different sizes. So far we have + // not found a case where this is beneficial. + imax := uint64(b.Compactions[len(b.Compactions)-1].Cutoff) + for _, ib := range b.IndexBlocks { + if x := uint64(ib.index.index); x > imax { + imax = x + } + } + b.IndexType, b.IndexSize = getIntType(imax) +} + +func maxValue(n *node, max uint64) uint64 { + if n == nil { + return max + } + for _, c := range n.children { + max = maxValue(c, max) + } + for _, v := range n.values { + if max < v { + max = v + } + } + return max +} + +func getIntType(v uint64) (string, int) { + switch { + case v < 1<<8: + return "uint8", 1 + case v < 1<<16: + return "uint16", 2 + case v < 1<<32: + return "uint32", 4 + } + return "uint64", 8 +} + +const ( + blockSize = 64 + + // Subtract two blocks to offset 0x80, the first continuation byte. + blockOffset = 2 + + // Subtract three blocks to offset 0xC0, the first non-ASCII starter. + rootBlockOffset = 3 +) + +var crcTable = crc64.MakeTable(crc64.ISO) + +func (b *builder) buildTrie(t *Trie) uint64 { + n := t.root + + // Get the ASCII offset. For the first trie, the ASCII block will be at + // position 0. + hasher := crc64.New(crcTable) + binary.Write(hasher, binary.BigEndian, n.values) + hash := hasher.Sum64() + + v, ok := b.asciiBlockIdx[hash] + if !ok { + v = len(b.ValueBlocks) + b.asciiBlockIdx[hash] = v + + b.ValueBlocks = append(b.ValueBlocks, n.values[:blockSize], n.values[blockSize:]) + if v == 0 { + // Add the zero block at position 2 so that it will be assigned a + // zero reference in the lookup blocks. + // TODO: always do this? This would allow us to remove a check from + // the trie lookup, but at the expense of extra space. Analyze + // performance for unicode/norm. + b.ValueBlocks = append(b.ValueBlocks, make([]uint64, blockSize)) + } + } + t.ASCIIIndex = v + + // Compute remaining offsets. + t.Checksum = b.computeOffsets(n, true) + // We already subtracted the normal blockOffset from the index. Subtract the + // difference for starter bytes. + t.StarterIndex = n.index.index - (rootBlockOffset - blockOffset) + return t.Checksum +} + +func (b *builder) computeOffsets(n *node, root bool) uint64 { + // For the first trie, the root lookup block will be at position 3, which is + // the offset for UTF-8 non-ASCII starter bytes. + first := len(b.IndexBlocks) == rootBlockOffset + if first { + b.IndexBlocks = append(b.IndexBlocks, n) + } + + // We special-case the cases where all values recursively are 0. This allows + // for the use of a zero block to which all such values can be directed. + hash := uint64(0) + if n.children != nil || n.values != nil { + hasher := crc64.New(crcTable) + for _, c := range n.children { + var v uint64 + if c != nil { + v = b.computeOffsets(c, false) + } + binary.Write(hasher, binary.BigEndian, v) + } + binary.Write(hasher, binary.BigEndian, n.values) + hash = hasher.Sum64() + } + + if first { + b.indexBlockIdx[hash] = rootBlockOffset - blockOffset + } + + // Compacters don't apply to internal nodes. + if n.children != nil { + v, ok := b.indexBlockIdx[hash] + if !ok { + v = len(b.IndexBlocks) - blockOffset + b.IndexBlocks = append(b.IndexBlocks, n) + b.indexBlockIdx[hash] = v + } + n.index = nodeIndex{0, v} + } else { + h, ok := b.valueBlockIdx[hash] + if !ok { + bestI, bestSize := 0, blockSize*b.ValueSize + for i, c := range b.Compactions[1:] { + if sz, ok := c.c.Size(n.values); ok && bestSize > sz { + bestI, bestSize = i+1, sz + } + } + c := &b.Compactions[bestI] + c.totalSize += bestSize + v := c.c.Store(n.values) + if c.maxHandle < v { + c.maxHandle = v + } + h = nodeIndex{bestI, int(v)} + b.valueBlockIdx[hash] = h + } + n.index = h + } + return hash +} |