/
hyphen_trie.go
101 lines (90 loc) · 2.85 KB
/
hyphen_trie.go
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/*
* trie.go
* Trie
*
* Created by Jim Dovey on 16/07/2010.
*
* Copyright (c) 2010 Jim Dovey
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the project's author nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package trie
import (
"unicode"
"utf8"
"container/vector"
"strings"
)
// Specialized function for TeX-style hyphenation patterns. Accepts strings of the form '.hy2p'.
// The value it stores is of type vector.IntVector
func (p *Trie) AddPatternString(s string) {
v := new(vector.IntVector)
// precompute the Unicode rune for the character '0'
rune0, _ := utf8.DecodeRune([]byte{'0'})
strLen := len(s)
// Using the range keyword will give us each Unicode rune.
for pos, rune := range s {
if unicode.IsDigit(rune) {
if pos == 0 {
// This is a prefix number
v.Push(rune - rune0)
}
// this is a number referring to the previous character, and has
// already been handled
continue
}
if pos < strLen-1 {
// look ahead to see if it's followed by a number
next := int(s[pos+1])
if unicode.IsDigit(next) {
// next char is the hyphenation value for this char
v.Push(next - rune0)
} else {
// hyphenation for this char is an implied zero
v.Push(0)
}
} else {
// last character gets an implied zero
v.Push(0)
}
}
pure := strings.Map(func(rune int) int {
if unicode.IsDigit(rune) {
return -1
}
return rune
},
s)
leaf := p.addRunes(strings.NewReader(pure))
if leaf == nil {
return
}
leaf.value = v
}