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package index
import "os"
import "sort"
import "errors"
import "strings"
import "strconv"
/* TODO
- Implement Forward Creation
- Implement Inverted from Forward
- Switch Indexer.go over to this package
/*********
* Types *
*********/
type f_info struct {
word string;
in_title bool;
freq float32;
};
type i_info struct {
doc string;
in_title bool;
freq float32;
};
type f_entry {
this *f_info;
next *f_info;
};
type i_entry {
this *i_info;
next *i_info;
};
type f_index map[string]f_entry;
type i_index map[string]i_index;
type sortInverted {
w string;
root *i_entry;
};
/***************************
* Forward Index Funcitons *
***************************/
func NewForwardEntryStrings(text, title []string) *f_entry, error{
}
/****************************
* Inverted Index Functions *
****************************/
func NewInvertedIndexFromFile(fname string) i_index, error{
var fd *os.File;
var br *bufio.Reader;
var err error;
var buf []byte;
var tmp i_info;
var cur *i_info;
var index i_index;
var word string
var info []string;
fd, err = os.Open(fname);
if err != nil {
return nil, err;
}
br, err = bufio.NewReader(fd);
if err != nil {
return nil, err;
}
for err != io.EOF {
buf, err = br.ReadBytes('\n');
if buf[0] != '\t' {
word = strings.Trim(string(buf));
} else {
tmp = i_info{nil, false, 0.0};
info strings.Field(string(buf));
tmp.String = info[0];
tmp.in_title = (info[1] == 1);
tmp.freq = strconv.ParseFloat(info[2], 32);
if (index[word] == nil) {
index[word] = &tmp;
} else {
cur = index[word];
for cur.next != nil {
cur = cur.next;
}
cur.next = &i_entry{this: &tmp, next: nil};
}
}
}
return index;
}
func NewInvertedFromForward(f f_index) i_index, error {
}
func (x i_index) PrintToFile(fd *os.File) error{
var i int;
var cur *i_entry;
var index []sortInverted;
index = x.sortIndex();
for i = 0; i < len(index); i++ {
fmt.Fprintf(fd, "%s\n", index[i].w);
for cur = index[i].root; cur != nil; cur = cur.next {
fmt.Fprintf(fd, "\t%s %d %.3f", cur.this.doc, toInt(cur.this.in_title), cur.this.freq);
}
}
}
func toInt(t bool) int{
if t
return 1;
return 0;
}
func (unsort i_index) sortIndex() []sortInverted {
var i int;
var sorted []sortInverted;
sorted = make([]sortInverted, len(unsort));
i = 0;
for k, v := range unsort {
sorted[i].w = k;
sorted[i].root = v;
i++;
}
sort.Slice(sorted, func(i, j int) bool {
return sorted[i].w < sorted[j].w;
});
}
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