Revision 7c331b1ee58f504e2f77c8ec64224ad3b674463b authored by Ronny Lorenz on 04 May 2015, 13:34:30 UTC, committed by Ronny Lorenz on 04 May 2015, 13:34:30 UTC
1 parent fa00faf
stringdist.c
/*
String alignment for RNA secondary structures
Peter F Stadler, Ivo Hofacker
Vienna RNA Package
*/
/* Last changed Time-stamp: <2005-07-23 10:19:40 ivo> */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "edit_cost.h"
#include "dist_vars.h"
#include "utils.h"
static char rcsid[] = "$Id: stringdist.c,v 1.3 2005/07/24 08:37:15 ivo Exp $";
#define PUBLIC
#define PRIVATE static
#define INFINITY_DIST 10000
PUBLIC float string_edit_distance(swString *T1, swString *T2);
PUBLIC swString *Make_swString(char *string);
PUBLIC void print_swString(swString *x);
PUBLIC void print_alignment_list(void);
PRIVATE void sprint_aligned_swStrings(swString *T1, swString *T2);
PRIVATE float StrEditCost(int i, int j, swString *T1, swString *T2);
PRIVATE void DeCode(char *string, int k, int *tp, float *w);
PRIVATE int decode(char *id);
PRIVATE void encode(int type, char label[]);
PRIVATE int *alignment[2]; /* contains information from backtracking
alignment[0][n] is the node in tree2
matching node n in tree1 */
/*---------------------------------------------------------------------------*/
PUBLIC float string_edit_distance(swString *T1, swString *T2)
{
float **distance;
short **i_point, **j_point;
int i, j, i1, j1, pos, length1,length2;
float minus, plus, change, temp;
if (cost_matrix==0) EditCost = &UsualCost;
else EditCost = &ShapiroCost;
length1 = T1[0].sign;
length2 = T2[0].sign;
distance = (float **) space((length1 +1)*sizeof(float *));
if(edit_backtrack){
i_point = (short **) space((length1 +1)*sizeof(short *));
j_point = (short **) space((length1 +1)*sizeof(short *));
}
for(i=0; i<= length1; i++){
distance[i] = (float *) space( (length2+1)*sizeof(float));
if(edit_backtrack){
i_point[i] = (short *) space( (length2+1)*sizeof(short));
j_point[i] = (short *) space( (length2+1)*sizeof(short));
}
}
for(i = 1; i <= length1; i++) {
if (edit_backtrack){
i_point[i][0] = i-1;
j_point[i][0] = 0;
}
distance[i][0] = distance[i-1][0]+StrEditCost(i,0,T1,T2);
}
for(j = 1; j <= length2; j++) {
if (edit_backtrack){
j_point[0][j] = j-1;
i_point[0][j] = 0;
}
distance[0][j] = distance[0][j-1]+StrEditCost(0,j,T1,T2);
}
for (i = 1; i <= length1; i++) {
for (j = 1; j <= length2 ; j++) {
minus = distance[i-1][j] + StrEditCost(i,0,T1,T2);
plus = distance[i][j-1] + StrEditCost(0,j,T1,T2);
change = distance[i-1][j-1]+ StrEditCost(i,j,T1,T2);
distance[i][j] = MIN3(minus, plus, change);
/* printf("%g ", distance[i][j]); */
if(edit_backtrack){
if(distance[i][j] == change) {
i_point[i][j]=i-1; j_point[i][j]=j-1; }
else if(distance[i][j] == plus) {
i_point[i][j]=i ; j_point[i][j]=j-1; }
else {
i_point[i][j]=i-1; j_point[i][j]=j ; }
}
}
/* printf("\n"); */
}
/* printf("\n"); */
temp = distance[length1][length2];
for(i=0;i<=length1;i++)
free(distance[i]);
free(distance);
if(edit_backtrack){
if(alignment[0]!= NULL) free(alignment[0]);
if(alignment[1]!= NULL) free(alignment[1]);
alignment[0] = (int *) space((length1+length2+1)*sizeof(int));
alignment[1] = (int *) space((length1+length2+1)*sizeof(int));
pos = length1+length2;
i = length1;
j = length2;
while( (i>0)||(j>0) ) {
i1 = i_point[i][j];
j1 = j_point[i][j];
if( ((i-i1)==1)&&((j-j1)==1) ) { /* substitution */
alignment[0][pos] = i;
alignment[1][pos] = j;
}
if( ((i-i1)==1)&&(j==j1) ) { /* Deletion in [1] */
alignment[0][pos] = i;
alignment[1][pos] = 0;
}
if( (i==i1)&&((j-j1)==1) ) { /* Deletion in [0] */
alignment[0][pos] = 0;
alignment[1][pos] = j;
}
pos--;
i = i1;
j = j1;
}
for(i=pos+1; i<=length1+length2; i++){
alignment[0][i-pos] = alignment[0][i];
alignment[1][i-pos] = alignment[1][i];
}
alignment[0][0] = length1+length2-pos; /* length of alignment */
for(i=0; i<=length1; i++){
free(i_point[i]); free(j_point[i]);
}
free(i_point); free(j_point);
sprint_aligned_swStrings(T1,T2);
}
return temp;
}
/*---------------------------------------------------------------------------*/
PRIVATE float StrEditCost(int i, int j, swString *T1, swString *T2)
{
float c, diff, cd, min, a, b, dist;
if(i==0) {
cd = (float) (*EditCost)[0][T2[j].type];
diff = T2[j].weight;
dist = cd*diff;
}
else
if(j==0) {
cd = (float) (*EditCost)[T1[i].type][0];
diff = T1[i].weight;
dist = cd*diff;
}
else
if( ((T1[i].sign)*(T2[j].sign)) > 0) {
c = (float) (*EditCost)[T1[i].type][T2[j].type];
diff = (float) fabs((a=T1[i].weight) - (b=T2[j].weight));
min = MIN2(a,b);
if (min == a) cd = (float) (*EditCost)[0][T2[j].type];
else cd = (float) (*EditCost)[T1[i].type][0];
dist = c * min + cd * diff;
}
else dist = (float) INFINITY_DIST;
return dist;
}
/*---------------------------------------------------------------------------*/
PUBLIC swString *Make_swString(char *string)
{
int i=0, j=0, k=0;
int tp, len, l, length;
float w;
swString *S;
length = strlen(string);
for(i=0; i<length; i++) {
if( (string[i]=='(') || (string[i]==')') ) j++;
if(string[i]=='.') j+=2;
}
len = j;
S= (swString *) space(sizeof(swString)*(len+1));
S[0].sign = j; /* number of entries */
S[0].weight= 0.0;
S[0].type= 0;
i=0;
j=1;
while(i<length){
switch(string[i]){
case '(' :
S[j].sign = 1;
l=1;
k=i;
while (l>0) {
k++;
if(string[k] == '(' ) l++;
if(string[k] == ')' ) l--;
}
DeCode(string,k,&tp,&w);
S[j].type = tp;
S[j].weight = w/2.0;
j++;
break;
case ')' :
k=i;
S[j].sign = -1;
DeCode(string,k,&tp,&w);
S[j].type = tp;
S[j].weight = w/2.0;
j++;
break;
case '.' :
S[j].sign = 1;
S[j].type = 1;
S[j].weight = 0.5;
j++;
S[j].sign = -1;
S[j].type = 1;
S[j].weight = 0.5;
j++;
break;
}
i++;
}
return S;
}
/*---------------------------------------------------------------------------*/
PRIVATE void DeCode(char *string, int k, int *tp, float *w)
/* retrieves type and weigth for a node closed by a bracket at position k */
{
int i,j,l,m;
char label[20], id[20] ;
i=k;
label[0] = '\0';
while(i>=0){
i--;
if( (string[i]=='(')||(string[i]==')')||(string[i]=='.') ) break;
else {
label[k-i-1] = string[i]; label[k-i] = '\0';
}
}
l=strlen(label);
if (l==0) { /* Dot-Bracket notation */
*w = 1.0;
*tp = 2;
}
else{
for (i=0; i<l; i++) {
if (!isalpha(label[l-i-1])) break;
id[i] = label[l-i-1];
}
id[i] = '\0';
*tp=decode(id);
l=l-i-1;
if(l>=0){
for(j=0; j<=l; j++)
id[j] = label[l-j];
label[l+1] ='\0';
m=-1;
sscanf(label,"%d",&m);
*w= (float) m;
if(m==-1) {
fprintf(stderr, "Warning: Non-integer weight in DeCode ignored\n");
*w=1.0;
}
}
else
*w=1.0;
}
}
/*---------------------------------------------------------------------------*/
PRIVATE int decode(char *id)
{
int n, quit, i;
char label[100], *code;
n = 0;
quit = 0;
code = coding;
while (!quit) {
for (i = 0; code[i] != sep; i++) {
if (code[i] == '\0') {
quit = 1;
break;
}
label[i] = code[i];
}
label[i] = '\0';
if (strcmp(id, label) == 0) return (n);
code += (i+1);
n++;
}
fprintf(stderr,"Syntax error: node identifier \"%s\" not found "
"in coding string \"%s\"\n", id, coding);
fprintf(stderr,"Exiting...");
exit(0);
}
/*---------------------------------------------------------------------------*/
PRIVATE void encode( int type, char label[])
{
int i, l;
l = 0;
for (i = 0; i < type; i++) {
while (coding[l] != sep && coding[l]) l++;
l++;
}
for (i = 0; coding[l+i] != sep; i++) {
if (coding[l+i] == '\0') break;
label[i] = coding[l+i];
}
label[i] = '\0';
}
/*---------------------------------------------------------------------------*/
PRIVATE void sprint_aligned_swStrings(swString *T1, swString *T2)
{
int i, j, l0, l1, ltmp=0, weights;
char label[10], *a0, *a1, tmp0[20], tmp1[20];
weights = 0;
for (i=1; i<=T1[0].sign; i++) weights = (weights||(T1[i].weight!=0.5));
for (i=1; i<=T2[0].sign; i++) weights = (weights||(T2[i].weight!=0.5));
a0 = (char *) space(alignment[0][0]*4+2);
a1 = (char *) space(alignment[0][0]*4+2);
for(i=1; i<= alignment[0][0]; i++){
tmp0[0] = '\0'; l0=0;
if(alignment[0][i] > 0) {
encode(T1[alignment[0][i]].type, label);
if(T1[alignment[0][i]].sign > 0) {
tmp0[0] = '(';
tmp0[1] = '\0';
}
strcat(tmp0,label);
if (weights)
sprintf(tmp0+strlen(tmp0), "%d",
(int)(2*T1[alignment[0][i]].weight));
if(T1[alignment[0][i]].sign < 0) strcat(tmp0, ")");
l0 = strlen(tmp0);
}
tmp1[0]= '\0'; l1=0;
if(alignment[1][i] > 0) {
encode(T2[alignment[1][i]].type, label);
if(T2[alignment[1][i]].sign > 0) {
tmp1[0] = '(';
tmp1[1] = '\0';
}
strcat(tmp1,label);
if (weights)
sprintf(tmp1+strlen(tmp1), "%d",
(int)(2*T2[alignment[1][i]].weight));
if(T2[alignment[1][i]].sign < 0) strcat(tmp1, ")");
l1 = strlen(tmp1);
}
ltmp = MAX2(l0,l1);
for (j=l0; j<ltmp; j++) tmp0[j] = '_';
for (j=l1; j<ltmp; j++) tmp1[j] = '_';
tmp0[ltmp] = '\0'; tmp1[ltmp] = '\0';
strcat(a0,tmp0); strcat(a1,tmp1);
ltmp = strlen(a0);
}
if (aligned_line[0]!= NULL) { free(aligned_line[0]); aligned_line[0]= NULL;}
if (aligned_line[1]!= NULL) { free(aligned_line[1]); aligned_line[1]= NULL;}
aligned_line[0] = strdup(a0);
free(a0);
aligned_line[1] = strdup(a1);
free(a1);
}
/*---------------------------------------------------------------------------*/
PUBLIC void print_swString(swString *x)
{
int i;
for (i=0; i<=x[0].sign; i++)
printf("(%d,%d,%f\n) ", x[i].type, x[i].sign, x[i].weight );
printf("\n");
}
/*---------------------------------------------------------------------------*/
PUBLIC void print_alignment_list(void)
{
int i;
printf("\n");
for (i=1; i<= alignment[0][0]; i++)
printf("%3d ",alignment[0][i]);
printf("\n");
for (i=1; i<= alignment[0][0]; i++)
printf("%3d ",alignment[1][i]);
printf("\n");
}
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