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1 #include <u.h>2 #include <libc.h>3 #include <draw.h>4 #include <thread.h>5 #include <cursor.h>6 #include <mouse.h>7 #include <keyboard.h>8 #include <frame.h>9 #include <fcall.h>10 #include <plumb.h>11 #include "dat.h"12 #include "fns.h"14 enum15 {16 None = 0,17 Fore = '+',18 Back = '-',19 };21 enum22 {23 Char,24 Line,25 };27 int28 isaddrc(int r)29 {30 if(r && utfrune("0123456789+-/$.#,;", r)!=nil)31 return TRUE;32 return FALSE;33 }35 /*36 * quite hard: could be almost anything but white space, but we are a little conservative,37 * aiming for regular expressions of alphanumerics and no white space38 */39 int40 isregexc(int r)41 {42 if(r == 0)43 return FALSE;44 if(isalnum(r))45 return TRUE;46 if(utfrune("^+-.*?#,;[]()$", r)!=nil)47 return TRUE;48 return FALSE;49 }51 Range52 number(Mntdir *md, Text *t, Range r, int line, int dir, int size, int *evalp)53 {54 uint q0, q1;56 if(size == Char){57 if(dir == Fore)58 line = r.q1+line;59 else if(dir == Back){60 if(r.q0==0 && line>0)61 r.q0 = t->file->b.nc;62 line = r.q0 - line;63 }64 if(line<0 || line>t->file->b.nc)65 goto Rescue;66 *evalp = TRUE;67 return range(line, line);68 }69 q0 = r.q0;70 q1 = r.q1;71 switch(dir){72 case None:73 q0 = 0;74 q1 = 0;75 Forward:76 while(line>0 && q1<t->file->b.nc)77 if(textreadc(t, q1++) == '\n' || q1==t->file->b.nc)78 if(--line > 0)79 q0 = q1;80 if(line > 0)81 goto Rescue;82 break;83 case Fore:84 if(q1 > 0)85 while(textreadc(t, q1-1) != '\n')86 q1++;87 q0 = q1;88 goto Forward;89 case Back:90 if(q0 < t->file->b.nc)91 while(q0>0 && textreadc(t, q0-1)!='\n')92 q0--;93 q1 = q0;94 while(line>0 && q0>0){95 if(textreadc(t, q0-1) == '\n'){96 if(--line >= 0)97 q1 = q0;98 }99 --q0;100 }101 if(line > 0)102 goto Rescue;103 while(q0>0 && textreadc(t, q0-1)!='\n')104 --q0;105 }106 *evalp = TRUE;107 return range(q0, q1);109 Rescue:110 if(md != nil)111 warning(nil, "address out of range\n");112 *evalp = FALSE;113 return r;114 }117 Range118 regexp(Mntdir *md, Text *t, Range lim, Range r, Rune *pat, int dir, int *foundp)119 {120 int found;121 Rangeset sel;122 int q;124 if(pat[0] == '\0' && rxnull()){125 warning(md, "no previous regular expression\n");126 *foundp = FALSE;127 return r;128 }129 if(pat[0] && rxcompile(pat) == FALSE){130 *foundp = FALSE;131 return r;132 }133 if(dir == Back)134 found = rxbexecute(t, r.q0, &sel);135 else{136 if(lim.q0 < 0)137 q = Infinity;138 else139 q = lim.q1;140 found = rxexecute(t, nil, r.q1, q, &sel);141 }142 if(!found && md==nil)143 warning(nil, "no match for regexp\n");144 *foundp = found;145 return sel.r[0];146 }148 Range149 address(Mntdir *md, Text *t, Range lim, Range ar, void *a, uint q0, uint q1, int (*getc)(void*, uint), int *evalp, uint *qp)150 {151 int dir, size, npat;152 int prevc, c, nc, n;153 uint q;154 Rune *pat;155 Range r, nr;157 r = ar;158 q = q0;159 dir = None;160 size = Line;161 c = 0;162 while(q < q1){163 prevc = c;164 c = (*getc)(a, q++);165 switch(c){166 default:167 *qp = q-1;168 return r;169 case ';':170 ar = r;171 /* fall through */172 case ',':173 if(prevc == 0) /* lhs defaults to 0 */174 r.q0 = 0;175 if(q>=q1 && t!=nil && t->file!=nil) /* rhs defaults to $ */176 r.q1 = t->file->b.nc;177 else{178 nr = address(md, t, lim, ar, a, q, q1, getc, evalp, &q);179 r.q1 = nr.q1;180 }181 *qp = q;182 return r;183 case '+':184 case '-':185 if(*evalp && (prevc=='+' || prevc=='-'))186 if((nc=(*getc)(a, q))!='#' && nc!='/' && nc!='?')187 r = number(md, t, r, 1, prevc, Line, evalp); /* do previous one */188 dir = c;189 break;190 case '.':191 case '$':192 if(q != q0+1){193 *qp = q-1;194 return r;195 }196 if(*evalp)197 if(c == '.')198 r = ar;199 else200 r = range(t->file->b.nc, t->file->b.nc);201 if(q < q1)202 dir = Fore;203 else204 dir = None;205 break;206 case '#':207 if(q==q1 || (c=(*getc)(a, q++))<'0' || '9'<c){208 *qp = q-1;209 return r;210 }211 size = Char;212 /* fall through */213 case '0': case '1': case '2': case '3': case '4':214 case '5': case '6': case '7': case '8': case '9':215 n = c -'0';216 while(q<q1){217 c = (*getc)(a, q++);218 if(c<'0' || '9'<c){219 q--;220 break;221 }222 n = n*10+(c-'0');223 }224 if(*evalp)225 r = number(md, t, r, n, dir, size, evalp);226 dir = None;227 size = Line;228 break;229 case '?':230 dir = Back;231 /* fall through */232 case '/':233 npat = 0;234 pat = nil;235 while(q<q1){236 c = (*getc)(a, q++);237 switch(c){238 case '\n':239 --q;240 goto out;241 case '\\':242 pat = runerealloc(pat, npat+1);243 pat[npat++] = c;244 if(q == q1)245 goto out;246 c = (*getc)(a, q++);247 break;248 case '/':249 goto out;250 }251 pat = runerealloc(pat, npat+1);252 pat[npat++] = c;253 }254 out:255 pat = runerealloc(pat, npat+1);256 pat[npat] = 0;257 if(*evalp)258 r = regexp(md, t, lim, r, pat, dir, evalp);259 free(pat);260 dir = None;261 size = Line;262 break;263 }264 }265 if(*evalp && dir != None)266 r = number(md, t, r, 1, dir, Line, evalp); /* do previous one */267 *qp = q;268 return r;269 }