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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(uint showerr, 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(q1<t->file->b.nc && 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(showerr)111 warning(nil, "address out of range\n");112 *evalp = FALSE;113 return r;114 }117 Range118 regexp(uint showerr, 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 if(showerr)126 warning(nil, "no previous regular expression\n");127 *foundp = FALSE;128 return r;129 }130 if(pat[0] && rxcompile(pat) == FALSE){131 *foundp = FALSE;132 return r;133 }134 if(dir == Back)135 found = rxbexecute(t, r.q0, &sel);136 else{137 if(lim.q0 < 0)138 q = Infinity;139 else140 q = lim.q1;141 found = rxexecute(t, nil, r.q1, q, &sel);142 }143 if(!found && showerr)144 warning(nil, "no match for regexp\n");145 *foundp = found;146 return sel.r[0];147 }149 Range150 address(uint showerr, Text *t, Range lim, Range ar, void *a, uint q0, uint q1, int (*getc)(void*, uint), int *evalp, uint *qp)151 {152 int dir, size, npat;153 int prevc, c, nc, n;154 uint q;155 Rune *pat;156 Range r, nr;158 r = ar;159 q = q0;160 dir = None;161 size = Line;162 c = 0;163 while(q < q1){164 prevc = c;165 c = (*getc)(a, q++);166 switch(c){167 default:168 *qp = q-1;169 return r;170 case ';':171 ar = r;172 /* fall through */173 case ',':174 if(prevc == 0) /* lhs defaults to 0 */175 r.q0 = 0;176 if(q>=q1 && t!=nil && t->file!=nil) /* rhs defaults to $ */177 r.q1 = t->file->b.nc;178 else{179 nr = address(showerr, t, lim, ar, a, q, q1, getc, evalp, &q);180 r.q1 = nr.q1;181 }182 *qp = q;183 return r;184 case '+':185 case '-':186 if(*evalp && (prevc=='+' || prevc=='-'))187 if((nc=(*getc)(a, q))!='#' && nc!='/' && nc!='?')188 r = number(showerr, t, r, 1, prevc, Line, evalp); /* do previous one */189 dir = c;190 break;191 case '.':192 case '$':193 if(q != q0+1){194 *qp = q-1;195 return r;196 }197 if(*evalp)198 if(c == '.')199 r = ar;200 else201 r = range(t->file->b.nc, t->file->b.nc);202 if(q < q1)203 dir = Fore;204 else205 dir = None;206 break;207 case '#':208 if(q==q1 || (c=(*getc)(a, q++))<'0' || '9'<c){209 *qp = q-1;210 return r;211 }212 size = Char;213 /* fall through */214 case '0': case '1': case '2': case '3': case '4':215 case '5': case '6': case '7': case '8': case '9':216 n = c -'0';217 while(q<q1){218 c = (*getc)(a, q++);219 if(c<'0' || '9'<c){220 q--;221 break;222 }223 n = n*10+(c-'0');224 }225 if(*evalp)226 r = number(showerr, t, r, n, dir, size, evalp);227 dir = None;228 size = Line;229 break;230 case '?':231 dir = Back;232 /* fall through */233 case '/':234 npat = 0;235 pat = nil;236 while(q<q1){237 c = (*getc)(a, q++);238 switch(c){239 case '\n':240 --q;241 goto out;242 case '\\':243 pat = runerealloc(pat, npat+1);244 pat[npat++] = c;245 if(q == q1)246 goto out;247 c = (*getc)(a, q++);248 break;249 case '/':250 goto out;251 }252 pat = runerealloc(pat, npat+1);253 pat[npat++] = c;254 }255 out:256 pat = runerealloc(pat, npat+1);257 pat[npat] = 0;258 if(*evalp)259 r = regexp(showerr, t, lim, r, pat, dir, evalp);260 free(pat);261 dir = None;262 size = Line;263 break;264 }265 }266 if(*evalp && dir != None)267 r = number(showerr, t, r, 1, dir, Line, evalp); /* do previous one */268 *qp = q;269 return r;270 }