ref: 37a8fc6168b3bf82df198fb20be5a8a53996187c
dir: /sys/src/cmd/acme/addr.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <plumb.h>
#include "dat.h"
#include "fns.h"
enum
{
None = 0,
Fore = '+',
Back = '-',
};
enum
{
Char,
Line,
};
int
isaddrc(int r)
{
if(r && utfrune("0123456789+-/$.#,;", r)!=nil)
return TRUE;
return FALSE;
}
/*
* quite hard: could be almost anything but white space, but we are a little conservative,
* aiming for regular expressions of alphanumerics and no white space
*/
int
isregexc(int r)
{
if(r == 0)
return FALSE;
if(isalnum(r))
return TRUE;
if(utfrune("^+-.*?#,;[]()$", r)!=nil)
return TRUE;
return FALSE;
}
// nlcounttopos starts at q0 and advances nl lines,
// being careful not to walk past the end of the text,
// and then nr chars, being careful not to walk past
// the end of the current line.
// It returns the final position.
long
nlcounttopos(Text *t, long q0, long nl, long nr)
{
while(nl > 0 && q0 < t->file->nc) {
if(textreadc(t, q0++) == '\n')
nl--;
}
if(nl > 0)
return q0;
while(nr > 0 && q0 < t->file->nc && textreadc(t, q0) != '\n') {
q0++;
nr--;
}
return q0;
}
Range
number(Mntdir *md, Text *t, Range r, int line, int dir, int size, int *evalp)
{
uint q0, q1;
if(size == Char){
if(dir == Fore)
line = r.q1+line;
else if(dir == Back){
if(r.q0==0 && line>0)
r.q0 = t->file->nc;
line = r.q0 - line;
}
if(line<0 || line>t->file->nc)
goto Rescue;
*evalp = TRUE;
return (Range){line, line};
}
q0 = r.q0;
q1 = r.q1;
switch(dir){
case None:
q0 = 0;
q1 = 0;
Forward:
while(line>0 && q1<t->file->nc)
if(textreadc(t, q1++) == '\n' || q1==t->file->nc)
if(--line > 0)
q0 = q1;
if(line > 0)
goto Rescue;
break;
case Fore:
if(q1 > 0)
while(q1<t->file->nc && textreadc(t, q1-1) != '\n')
q1++;
q0 = q1;
goto Forward;
case Back:
if(q0 < t->file->nc)
while(q0>0 && textreadc(t, q0-1)!='\n')
q0--;
q1 = q0;
while(line>0 && q0>0){
if(textreadc(t, q0-1) == '\n'){
if(--line >= 0)
q1 = q0;
}
--q0;
}
/* :1-1 is :0 = #0, but :1-2 is an error */
if(line > 1)
goto Rescue;
while(q0>0 && textreadc(t, q0-1)!='\n')
--q0;
}
*evalp = TRUE;
return (Range){q0, q1};
Rescue:
if(md != nil)
warning(nil, "address out of range\n");
*evalp = FALSE;
return r;
}
Range
regexp(Mntdir *md, Text *t, Range lim, Range r, Rune *pat, int dir, int *foundp)
{
int found;
Rangeset sel;
int q;
if(pat[0] == '\0' && rxnull()){
warning(md, "no previous regular expression\n");
*foundp = FALSE;
return r;
}
if(pat[0] && rxcompile(pat) == FALSE){
*foundp = FALSE;
return r;
}
if(dir == Back)
found = rxbexecute(t, r.q0, &sel);
else{
if(lim.q0 < 0)
q = Infinity;
else
q = lim.q1;
found = rxexecute(t, nil, r.q1, q, &sel);
}
if(!found && md==nil)
warning(nil, "no match for regexp\n");
*foundp = found;
return sel.r[0];
}
Range
address(Mntdir *md, Text *t, Range lim, Range ar, void *a, uint q0, uint q1, int (*getc)(void*, uint), int *evalp, uint *qp)
{
int dir, size, npat;
int prevc, c, nc, n;
uint q;
Rune *pat;
Range r, nr;
r = ar;
q = q0;
dir = None;
size = Line;
c = 0;
while(q < q1){
prevc = c;
c = (*getc)(a, q++);
switch(c){
default:
*qp = q-1;
return r;
case ';':
ar = r;
/* fall through */
case ',':
if(prevc == 0) /* lhs defaults to 0 */
r.q0 = 0;
if(q>=q1 && t!=nil && t->file!=nil) /* rhs defaults to $ */
r.q1 = t->file->nc;
else{
nr = address(md, t, lim, ar, a, q, q1, getc, evalp, &q);
r.q1 = nr.q1;
}
*qp = q;
return r;
case '+':
case '-':
if(*evalp && (prevc=='+' || prevc=='-'))
if((nc=(*getc)(a, q))!='#' && nc!='/' && nc!='?')
r = number(md, t, r, 1, prevc, Line, evalp); /* do previous one */
dir = c;
break;
case '.':
case '$':
if(q != q0+1){
*qp = q-1;
return r;
}
if(*evalp)
if(c == '.')
r = ar;
else
r = (Range){t->file->nc, t->file->nc};
if(q < q1)
dir = Fore;
else
dir = None;
break;
case '#':
if(q==q1 || (c=(*getc)(a, q++))<'0' || '9'<c){
*qp = q-1;
return r;
}
size = Char;
/* fall through */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = c -'0';
while(q<q1){
nc = (*getc)(a, q++);
if(nc<'0' || '9'<nc){
q--;
break;
}
n = n*10+(nc-'0');
}
if(*evalp)
r = number(md, t, r, n, dir, size, evalp);
dir = None;
size = Line;
break;
case '?':
dir = Back;
/* fall through */
case '/':
npat = 0;
pat = nil;
while(q<q1){
c = (*getc)(a, q++);
switch(c){
case '\n':
--q;
goto out;
case '\\':
pat = runerealloc(pat, npat+1);
pat[npat++] = c;
if(q == q1)
goto out;
c = (*getc)(a, q++);
break;
case '/':
goto out;
}
pat = runerealloc(pat, npat+1);
pat[npat++] = c;
}
out:
pat = runerealloc(pat, npat+1);
pat[npat] = 0;
if(*evalp)
r = regexp(md, t, lim, r, pat, dir, evalp);
free(pat);
dir = None;
size = Line;
break;
}
}
if(*evalp && dir != None)
r = number(md, t, r, 1, dir, Line, evalp); /* do previous one */
*qp = q;
return r;
}