vendor/golang.org/x/text/unicode/norm/iter.go

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// Copyright 2011 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 norm

import (
	"fmt"
	"unicode/utf8"
)

// MaxSegmentSize is the maximum size of a byte buffer needed to consider any
// sequence of starter and non-starter runes for the purpose of normalization.
const MaxSegmentSize = maxByteBufferSize

// An Iter iterates over a string or byte slice, while normalizing it
// to a given Form.
type Iter struct {
	rb     reorderBuffer
	buf    [maxByteBufferSize]byte
	info   Properties // first character saved from previous iteration
	next   iterFunc   // implementation of next depends on form
	asciiF iterFunc

	p        int    // current position in input source
	multiSeg []byte // remainder of multi-segment decomposition
}

type iterFunc func(*Iter) []byte

// Init initializes i to iterate over src after normalizing it to Form f.
func (i *Iter) Init(f Form, src []byte) {
	i.p = 0
	if len(src) == 0 {
		i.setDone()
		i.rb.nsrc = 0
		return
	}
	i.multiSeg = nil
	i.rb.init(f, src)
	i.next = i.rb.f.nextMain
	i.asciiF = nextASCIIBytes
	i.info = i.rb.f.info(i.rb.src, i.p)
	i.rb.ss.first(i.info)
}

// InitString initializes i to iterate over src after normalizing it to Form f.
func (i *Iter) InitString(f Form, src string) {
	i.p = 0
	if len(src) == 0 {
		i.setDone()
		i.rb.nsrc = 0
		return
	}
	i.multiSeg = nil
	i.rb.initString(f, src)
	i.next = i.rb.f.nextMain
	i.asciiF = nextASCIIString
	i.info = i.rb.f.info(i.rb.src, i.p)
	i.rb.ss.first(i.info)