table.go

Documentation: golang.org/x/text/collate/build

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package build
     6  
     7  import (
     8  	"fmt"
     9  	"io"
    10  	"reflect"
    11  
    12  	"golang.org/x/text/internal/colltab"
    13  )
    14  
    15  // table is an intermediate structure that roughly resembles the table in collate.
    16  type table struct {
    17  	colltab.Table
    18  	trie trie
    19  	root *trieHandle
    20  }
    21  
    22  // print writes the table as Go compilable code to w. It prefixes the
    23  // variable names with name. It returns the number of bytes written
    24  // and the size of the resulting table.
    25  func (t *table) fprint(w io.Writer, name string) (n, size int, err error) {
    26  	update := func(nn, sz int, e error) {
    27  		n += nn
    28  		if err == nil {
    29  			err = e
    30  		}
    31  		size += sz
    32  	}
    33  	// Write arrays needed for the structure.
    34  	update(printColElems(w, t.ExpandElem, name+"ExpandElem"))
    35  	update(printColElems(w, t.ContractElem, name+"ContractElem"))
    36  	update(t.trie.printArrays(w, name))
    37  	update(printArray(t.ContractTries, w, name))
    38  
    39  	nn, e := fmt.Fprintf(w, "// Total size of %sTable is %d bytes\n", name, size)
    40  	update(nn, 0, e)
    41  	return
    42  }
    43  
    44  func (t *table) fprintIndex(w io.Writer, h *trieHandle, id string) (n int, err error) {
    45  	p := func(f string, a ...interface{}) {
    46  		nn, e := fmt.Fprintf(w, f, a...)
    47  		n += nn
    48  		if err == nil {
    49  			err = e
    50  		}
    51  	}
    52  	p("\t{ // %s\n", id)
    53  	p("\t\tlookupOffset: 0x%x,\n", h.lookupStart)
    54  	p("\t\tvaluesOffset: 0x%x,\n", h.valueStart)
    55  	p("\t},\n")
    56  	return
    57  }
    58  
    59  func printColElems(w io.Writer, a []uint32, name string) (n, sz int, err error) {
    60  	p := func(f string, a ...interface{}) {
    61  		nn, e := fmt.Fprintf(w, f, a...)
    62  		n += nn
    63  		if err == nil {
    64  			err = e
    65  		}
    66  	}
    67  	sz = len(a) * int(reflect.TypeOf(uint32(0)).Size())
    68  	p("// %s: %d entries, %d bytes\n", name, len(a), sz)
    69  	p("var %s = [%d]uint32 {", name, len(a))
    70  	for i, c := range a {
    71  		switch {
    72  		case i%64 == 0:
    73  			p("\n\t// Block %d, offset 0x%x\n", i/64, i)
    74  		case (i%64)%6 == 0:
    75  			p("\n\t")
    76  		}
    77  		p("0x%.8X, ", c)
    78  	}
    79  	p("\n}\n\n")
    80  	return
    81  }
    82
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