1867 lines
41 KiB
C
1867 lines
41 KiB
C
/*
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* Copyright (C) 1984-2023 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information, see the README file.
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*/
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/*
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* Routines to search a file for a pattern.
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*/
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#include "less.h"
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#include "position.h"
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#include "charset.h"
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#define MINPOS(a,b) (((a) < (b)) ? (a) : (b))
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#define MAXPOS(a,b) (((a) > (b)) ? (a) : (b))
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extern int sigs;
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extern int how_search;
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extern int caseless;
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extern int linenums;
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extern int sc_height;
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extern int jump_sline;
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extern int bs_mode;
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extern int proc_backspace;
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extern int proc_return;
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extern int ctldisp;
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extern int status_col;
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extern void *ml_search;
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extern POSITION start_attnpos;
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extern POSITION end_attnpos;
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extern int utf_mode;
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extern int screen_trashed;
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extern int sc_width;
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extern int sc_height;
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extern int hshift;
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extern int nosearch_headers;
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extern int header_lines;
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extern int header_cols;
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#if HILITE_SEARCH
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extern int hilite_search;
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extern int size_linebuf;
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extern int squished;
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extern int can_goto_line;
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static int hide_hilite;
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static POSITION prep_startpos;
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static POSITION prep_endpos;
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extern POSITION xxpos;
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/*
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* Structures for maintaining a set of ranges for hilites and filtered-out
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* lines. Each range is stored as a node within a red-black tree, and we
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* try to extend existing ranges (without creating overlaps) rather than
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* create new nodes if possible. We remember the last node found by a
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* search for constant-time lookup if the next search is near enough to
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* the previous. To aid that, we overlay a secondary doubly-linked list
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* on top of the red-black tree so we can find the preceding/succeeding
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* nodes also in constant time.
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*
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* Each node is allocated from a series of pools, each pool double the size
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* of the previous (for amortised constant time allocation). Since our only
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* tree operations are clear and node insertion, not node removal, we don't
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* need to maintain a usage bitmap or freelist and can just return nodes
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* from the pool in-order until capacity is reached.
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*/
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struct hilite
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{
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POSITION hl_startpos;
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POSITION hl_endpos;
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int hl_attr;
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};
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struct hilite_node
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{
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struct hilite_node *parent;
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struct hilite_node *left;
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struct hilite_node *right;
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struct hilite_node *prev;
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struct hilite_node *next;
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int red;
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struct hilite r;
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};
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struct hilite_storage
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{
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int capacity;
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int used;
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struct hilite_storage *next;
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struct hilite_node *nodes;
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};
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struct hilite_tree
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{
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struct hilite_storage *first;
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struct hilite_storage *current;
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struct hilite_node *root;
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struct hilite_node *lookaside;
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};
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#define HILITE_INITIALIZER() { NULL, NULL, NULL, NULL }
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#define HILITE_LOOKASIDE_STEPS 2
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static struct hilite_tree hilite_anchor = HILITE_INITIALIZER();
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static struct hilite_tree filter_anchor = HILITE_INITIALIZER();
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static struct pattern_info *filter_infos = NULL;
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#endif
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/*
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* These are the static variables that represent the "remembered"
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* search pattern and filter pattern.
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*/
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struct pattern_info {
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PATTERN_TYPE compiled;
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char* text;
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int search_type;
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int is_ucase_pattern;
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struct pattern_info *next;
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};
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#if NO_REGEX
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#define info_compiled(info) ((void*)0)
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#else
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#define info_compiled(info) ((info)->compiled)
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#endif
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static struct pattern_info search_info;
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public int is_caseless;
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/*
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* Are there any uppercase letters in this string?
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*/
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static int is_ucase(char *str)
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{
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char *str_end = str + strlen(str);
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LWCHAR ch;
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while (str < str_end)
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{
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ch = step_char(&str, +1, str_end);
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if (IS_UPPER(ch))
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return (1);
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}
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return (0);
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}
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/*
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* Discard a saved pattern.
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*/
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static void clear_pattern(struct pattern_info *info)
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{
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if (info->text != NULL)
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free(info->text);
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info->text = NULL;
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#if !NO_REGEX
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uncompile_pattern(&info->compiled);
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#endif
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}
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/*
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* Compile and save a search pattern.
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*/
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static int set_pattern(struct pattern_info *info, char *pattern, int search_type, int show_error)
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{
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/*
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* Ignore case if -I is set OR
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* -i is set AND the pattern is all lowercase.
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*/
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info->is_ucase_pattern = (pattern == NULL) ? FALSE : is_ucase(pattern);
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is_caseless = (info->is_ucase_pattern && caseless != OPT_ONPLUS) ? 0 : caseless;
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#if !NO_REGEX
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if (pattern == NULL)
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SET_NULL_PATTERN(info->compiled);
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else if (compile_pattern(pattern, search_type, show_error, &info->compiled) < 0)
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return -1;
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#endif
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/* Pattern compiled successfully; save the text too. */
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if (info->text != NULL)
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free(info->text);
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info->text = NULL;
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if (pattern != NULL)
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{
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info->text = (char *) ecalloc(1, strlen(pattern)+1);
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strcpy(info->text, pattern);
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}
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info->search_type = search_type;
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return 0;
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}
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/*
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* Initialize saved pattern to nothing.
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*/
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static void init_pattern(struct pattern_info *info)
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{
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SET_NULL_PATTERN(info->compiled);
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info->text = NULL;
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info->search_type = 0;
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info->next = NULL;
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}
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/*
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* Initialize search variables.
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*/
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public void init_search(void)
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{
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init_pattern(&search_info);
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}
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/*
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* Determine which text conversions to perform before pattern matching.
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*/
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static int get_cvt_ops(int search_type)
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{
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int ops = 0;
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if (is_caseless && (!re_handles_caseless || (search_type & SRCH_NO_REGEX)))
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ops |= CVT_TO_LC;
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if (proc_backspace == OPT_ON || (bs_mode == BS_SPECIAL && proc_backspace == OPT_OFF))
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ops |= CVT_BS;
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if (proc_return == OPT_ON || (bs_mode != BS_CONTROL && proc_backspace == OPT_OFF))
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ops |= CVT_CRLF;
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if (ctldisp == OPT_ONPLUS)
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ops |= CVT_ANSI;
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return (ops);
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}
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/*
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* Is there a previous (remembered) search pattern?
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*/
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static int prev_pattern(struct pattern_info *info)
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{
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#if !NO_REGEX
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if ((info->search_type & SRCH_NO_REGEX) == 0)
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return (!is_null_pattern(info->compiled));
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#endif
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return (info->text != NULL);
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}
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#if HILITE_SEARCH
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/*
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* Repaint the hilites currently displayed on the screen.
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* Repaint each line which contains highlighted text.
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* If on==0, force all hilites off.
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*/
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public void repaint_hilite(int on)
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{
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int sindex;
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POSITION pos;
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int save_hide_hilite;
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if (squished)
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repaint();
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save_hide_hilite = hide_hilite;
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if (!on)
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{
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if (hide_hilite)
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return;
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hide_hilite = 1;
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}
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if (!can_goto_line)
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{
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repaint();
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hide_hilite = save_hide_hilite;
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return;
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}
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for (sindex = TOP; sindex < TOP + sc_height-1; sindex++)
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{
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pos = position(sindex);
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if (pos == NULL_POSITION)
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continue;
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(void) forw_line(pos);
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goto_line(sindex);
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clear_eol();
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put_line();
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}
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overlay_header();
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lower_left();
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hide_hilite = save_hide_hilite;
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}
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#endif
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/*
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* Clear the attn hilite.
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*/
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public void clear_attn(void)
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{
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#if HILITE_SEARCH
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int sindex;
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POSITION old_start_attnpos;
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POSITION old_end_attnpos;
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POSITION pos;
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POSITION epos;
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int moved = 0;
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if (start_attnpos == NULL_POSITION)
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return;
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old_start_attnpos = start_attnpos;
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old_end_attnpos = end_attnpos;
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start_attnpos = end_attnpos = NULL_POSITION;
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if (!can_goto_line)
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{
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repaint();
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return;
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}
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if (squished)
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repaint();
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for (sindex = TOP; sindex < TOP + sc_height-1; sindex++)
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{
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pos = position(sindex);
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if (pos == NULL_POSITION)
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continue;
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epos = position(sindex+1);
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if (pos <= old_end_attnpos &&
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(epos == NULL_POSITION || epos > old_start_attnpos))
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{
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(void) forw_line(pos);
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goto_line(sindex);
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clear_eol();
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put_line();
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moved = 1;
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}
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}
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if (overlay_header())
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moved = 1;
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if (moved)
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lower_left();
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#endif
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}
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/*
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* Toggle or clear search string highlighting.
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*/
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public void undo_search(int clear)
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{
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clear_pattern(&search_info);
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#if HILITE_SEARCH
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if (clear)
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{
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clr_hilite();
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} else
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{
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if (hilite_anchor.first == NULL)
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{
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error("No previous regular expression", NULL_PARG);
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return;
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}
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hide_hilite = !hide_hilite;
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}
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repaint_hilite(1);
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#endif
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}
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#if HILITE_SEARCH
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/*
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* Clear the hilite list.
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*/
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public void clr_hlist(struct hilite_tree *anchor)
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{
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struct hilite_storage *hls;
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struct hilite_storage *nexthls;
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for (hls = anchor->first; hls != NULL; hls = nexthls)
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{
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nexthls = hls->next;
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free((void*)hls->nodes);
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free((void*)hls);
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}
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anchor->first = NULL;
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anchor->current = NULL;
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anchor->root = NULL;
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anchor->lookaside = NULL;
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prep_startpos = prep_endpos = NULL_POSITION;
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}
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public void clr_hilite(void)
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{
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clr_hlist(&hilite_anchor);
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}
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public void clr_filter(void)
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{
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clr_hlist(&filter_anchor);
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}
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/*
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* Find the node covering pos, or the node after it if no node covers it,
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* or return NULL if pos is after the last range. Remember the found node,
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* to speed up subsequent searches for the same or similar positions (if
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* we return NULL, remember the last node.)
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*/
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static struct hilite_node* hlist_find(struct hilite_tree *anchor, POSITION pos)
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{
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struct hilite_node *n, *m;
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if (anchor->lookaside)
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{
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int steps = 0;
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int hit = 0;
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n = anchor->lookaside;
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for (;;)
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{
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if (pos < n->r.hl_endpos)
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{
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if (n->prev == NULL || pos >= n->prev->r.hl_endpos)
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{
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hit = 1;
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break;
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}
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} else if (n->next == NULL)
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{
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n = NULL;
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hit = 1;
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break;
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}
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/*
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* If we don't find the right node within a small
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* distance, don't keep doing a linear search!
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*/
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if (steps >= HILITE_LOOKASIDE_STEPS)
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break;
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steps++;
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if (pos < n->r.hl_endpos)
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anchor->lookaside = n = n->prev;
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else
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anchor->lookaside = n = n->next;
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}
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if (hit)
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return n;
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}
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n = anchor->root;
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m = NULL;
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while (n != NULL)
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{
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if (pos < n->r.hl_startpos)
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{
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if (n->left != NULL)
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{
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m = n;
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n = n->left;
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continue;
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}
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break;
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}
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if (pos >= n->r.hl_endpos)
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{
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if (n->right != NULL)
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{
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n = n->right;
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continue;
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}
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if (m != NULL)
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{
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n = m;
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} else
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{
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m = n;
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n = NULL;
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}
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}
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break;
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}
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if (n != NULL)
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anchor->lookaside = n;
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else if (m != NULL)
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anchor->lookaside = m;
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return n;
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}
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/*
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* Should any characters in a specified range be highlighted?
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*/
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static int hilited_range_attr(POSITION pos, POSITION epos)
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{
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struct hilite_node *n = hlist_find(&hilite_anchor, pos);
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if (n == NULL)
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return 0;
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if (epos != NULL_POSITION && epos <= n->r.hl_startpos)
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return 0;
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return n->r.hl_attr;
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}
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/*
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* Is a line "filtered" -- that is, should it be hidden?
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*/
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public int is_filtered(POSITION pos)
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{
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struct hilite_node *n;
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if (ch_getflags() & CH_HELPFILE)
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return (0);
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n = hlist_find(&filter_anchor, pos);
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return (n != NULL && pos >= n->r.hl_startpos);
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}
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/*
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* If pos is hidden, return the next position which isn't, otherwise
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* just return pos.
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*/
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public POSITION next_unfiltered(POSITION pos)
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{
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struct hilite_node *n;
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if (ch_getflags() & CH_HELPFILE)
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return (pos);
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n = hlist_find(&filter_anchor, pos);
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while (n != NULL && pos >= n->r.hl_startpos)
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{
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pos = n->r.hl_endpos;
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n = n->next;
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}
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return (pos);
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}
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/*
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* If pos is hidden, return the previous position which isn't or 0 if
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* we're filtered right to the beginning, otherwise just return pos.
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*/
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public POSITION prev_unfiltered(POSITION pos)
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{
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struct hilite_node *n;
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if (ch_getflags() & CH_HELPFILE)
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return (pos);
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n = hlist_find(&filter_anchor, pos);
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while (n != NULL && pos >= n->r.hl_startpos)
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{
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pos = n->r.hl_startpos;
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if (pos == 0)
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break;
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pos--;
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n = n->prev;
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}
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return (pos);
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}
|
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|
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/*
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* Should any characters in a specified range be highlighted?
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* If nohide is nonzero, don't consider hide_hilite.
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*/
|
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public int is_hilited_attr(POSITION pos, POSITION epos, int nohide, int *p_matches)
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{
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int attr;
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|
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if (p_matches != NULL)
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*p_matches = 0;
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|
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if (!status_col &&
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start_attnpos != NULL_POSITION &&
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pos <= end_attnpos &&
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(epos == NULL_POSITION || epos >= start_attnpos))
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/*
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* The attn line overlaps this range.
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*/
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return (AT_HILITE|AT_COLOR_ATTN);
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attr = hilited_range_attr(pos, epos);
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if (attr == 0)
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return (0);
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|
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if (p_matches == NULL)
|
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/*
|
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* Kinda kludgy way to recognize that caller is checking for
|
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* hilite in status column. In this case we want to return
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* hilite status even if hiliting is disabled or hidden.
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*/
|
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return (attr);
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|
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/*
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* Report matches, even if we're hiding highlights.
|
|
*/
|
|
*p_matches = 1;
|
|
|
|
if (hilite_search == 0)
|
|
/*
|
|
* Not doing highlighting.
|
|
*/
|
|
return (0);
|
|
|
|
if (!nohide && hide_hilite)
|
|
/*
|
|
* Highlighting is hidden.
|
|
*/
|
|
return (0);
|
|
|
|
return (attr);
|
|
}
|
|
|
|
/*
|
|
* Tree node storage: get the current block of nodes if it has spare
|
|
* capacity, or create a new one if not.
|
|
*/
|
|
static struct hilite_storage * hlist_getstorage(struct hilite_tree *anchor)
|
|
{
|
|
int capacity = 1;
|
|
struct hilite_storage *s;
|
|
|
|
if (anchor->current)
|
|
{
|
|
if (anchor->current->used < anchor->current->capacity)
|
|
return anchor->current;
|
|
capacity = anchor->current->capacity * 2;
|
|
}
|
|
|
|
s = (struct hilite_storage *) ecalloc(1, sizeof(struct hilite_storage));
|
|
s->nodes = (struct hilite_node *) ecalloc(capacity, sizeof(struct hilite_node));
|
|
s->capacity = capacity;
|
|
s->used = 0;
|
|
s->next = NULL;
|
|
if (anchor->current)
|
|
anchor->current->next = s;
|
|
else
|
|
anchor->first = s;
|
|
anchor->current = s;
|
|
return s;
|
|
}
|
|
|
|
/*
|
|
* Tree node storage: retrieve a new empty node to be inserted into the
|
|
* tree.
|
|
*/
|
|
static struct hilite_node * hlist_getnode(struct hilite_tree *anchor)
|
|
{
|
|
struct hilite_storage *s = hlist_getstorage(anchor);
|
|
return &s->nodes[s->used++];
|
|
}
|
|
|
|
/*
|
|
* Rotate the tree left around a pivot node.
|
|
*/
|
|
static void hlist_rotate_left(struct hilite_tree *anchor, struct hilite_node *n)
|
|
{
|
|
struct hilite_node *np = n->parent;
|
|
struct hilite_node *nr = n->right;
|
|
struct hilite_node *nrl = n->right->left;
|
|
|
|
if (np != NULL)
|
|
{
|
|
if (n == np->left)
|
|
np->left = nr;
|
|
else
|
|
np->right = nr;
|
|
} else
|
|
{
|
|
anchor->root = nr;
|
|
}
|
|
nr->left = n;
|
|
n->right = nrl;
|
|
|
|
nr->parent = np;
|
|
n->parent = nr;
|
|
if (nrl != NULL)
|
|
nrl->parent = n;
|
|
}
|
|
|
|
/*
|
|
* Rotate the tree right around a pivot node.
|
|
*/
|
|
static void hlist_rotate_right(struct hilite_tree *anchor, struct hilite_node *n)
|
|
{
|
|
struct hilite_node *np = n->parent;
|
|
struct hilite_node *nl = n->left;
|
|
struct hilite_node *nlr = n->left->right;
|
|
|
|
if (np != NULL)
|
|
{
|
|
if (n == np->right)
|
|
np->right = nl;
|
|
else
|
|
np->left = nl;
|
|
} else
|
|
{
|
|
anchor->root = nl;
|
|
}
|
|
nl->right = n;
|
|
n->left = nlr;
|
|
|
|
nl->parent = np;
|
|
n->parent = nl;
|
|
if (nlr != NULL)
|
|
nlr->parent = n;
|
|
}
|
|
|
|
|
|
/*
|
|
* Add a new hilite to a hilite list.
|
|
*/
|
|
static void add_hilite(struct hilite_tree *anchor, struct hilite *hl)
|
|
{
|
|
struct hilite_node *p, *n, *u;
|
|
|
|
/* Ignore empty ranges. */
|
|
if (hl->hl_startpos >= hl->hl_endpos)
|
|
return;
|
|
|
|
p = anchor->root;
|
|
|
|
/* Inserting the very first node is trivial. */
|
|
if (p == NULL)
|
|
{
|
|
n = hlist_getnode(anchor);
|
|
n->r = *hl;
|
|
anchor->root = n;
|
|
anchor->lookaside = n;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Find our insertion point. If we come across any overlapping
|
|
* or adjoining existing ranges, shrink our range and discard
|
|
* if it become empty.
|
|
*/
|
|
for (;;)
|
|
{
|
|
if (hl->hl_startpos < p->r.hl_startpos)
|
|
{
|
|
if (hl->hl_endpos > p->r.hl_startpos && hl->hl_attr == p->r.hl_attr)
|
|
hl->hl_endpos = p->r.hl_startpos;
|
|
if (p->left != NULL)
|
|
{
|
|
p = p->left;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (hl->hl_startpos < p->r.hl_endpos && hl->hl_attr == p->r.hl_attr) {
|
|
hl->hl_startpos = p->r.hl_endpos;
|
|
if (hl->hl_startpos >= hl->hl_endpos)
|
|
return;
|
|
}
|
|
if (p->right != NULL)
|
|
{
|
|
p = p->right;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Now we're at the right leaf, again check for contiguous ranges
|
|
* and extend the existing node if possible to avoid the
|
|
* insertion. Otherwise insert a new node at the leaf.
|
|
*/
|
|
if (hl->hl_startpos < p->r.hl_startpos) {
|
|
if (hl->hl_attr == p->r.hl_attr)
|
|
{
|
|
if (hl->hl_endpos == p->r.hl_startpos)
|
|
{
|
|
p->r.hl_startpos = hl->hl_startpos;
|
|
return;
|
|
}
|
|
if (p->prev != NULL && p->prev->r.hl_endpos == hl->hl_startpos)
|
|
{
|
|
p->prev->r.hl_endpos = hl->hl_endpos;
|
|
return;
|
|
}
|
|
}
|
|
p->left = n = hlist_getnode(anchor);
|
|
n->next = p;
|
|
if (p->prev != NULL)
|
|
{
|
|
n->prev = p->prev;
|
|
p->prev->next = n;
|
|
}
|
|
p->prev = n;
|
|
} else {
|
|
if (hl->hl_attr == p->r.hl_attr)
|
|
{
|
|
if (p->r.hl_endpos == hl->hl_startpos)
|
|
{
|
|
p->r.hl_endpos = hl->hl_endpos;
|
|
return;
|
|
}
|
|
if (p->next != NULL && hl->hl_endpos == p->next->r.hl_startpos) {
|
|
p->next->r.hl_startpos = hl->hl_startpos;
|
|
return;
|
|
}
|
|
}
|
|
p->right = n = hlist_getnode(anchor);
|
|
n->prev = p;
|
|
if (p->next != NULL)
|
|
{
|
|
n->next = p->next;
|
|
p->next->prev = n;
|
|
}
|
|
p->next = n;
|
|
}
|
|
n->parent = p;
|
|
n->red = 1;
|
|
n->r = *hl;
|
|
|
|
/*
|
|
* The tree is in the correct order and covers the right ranges
|
|
* now, but may have become unbalanced. Rebalance it using the
|
|
* standard red-black tree constraints and operations.
|
|
*/
|
|
for (;;)
|
|
{
|
|
/* case 1 - current is root, root is always black */
|
|
if (n->parent == NULL)
|
|
{
|
|
n->red = 0;
|
|
break;
|
|
}
|
|
|
|
/* case 2 - parent is black, we can always be red */
|
|
if (!n->parent->red)
|
|
break;
|
|
|
|
/*
|
|
* constraint: because the root must be black, if our
|
|
* parent is red it cannot be the root therefore we must
|
|
* have a grandparent
|
|
*/
|
|
|
|
/*
|
|
* case 3 - parent and uncle are red, repaint them black,
|
|
* the grandparent red, and start again at the grandparent.
|
|
*/
|
|
u = n->parent->parent->left;
|
|
if (n->parent == u)
|
|
u = n->parent->parent->right;
|
|
if (u != NULL && u->red)
|
|
{
|
|
n->parent->red = 0;
|
|
u->red = 0;
|
|
n = n->parent->parent;
|
|
n->red = 1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* case 4 - parent is red but uncle is black, parent and
|
|
* grandparent on opposite sides. We need to start
|
|
* changing the structure now. This and case 5 will shorten
|
|
* our branch and lengthen the sibling, between them
|
|
* restoring balance.
|
|
*/
|
|
if (n == n->parent->right &&
|
|
n->parent == n->parent->parent->left)
|
|
{
|
|
hlist_rotate_left(anchor, n->parent);
|
|
n = n->left;
|
|
} else if (n == n->parent->left &&
|
|
n->parent == n->parent->parent->right)
|
|
{
|
|
hlist_rotate_right(anchor, n->parent);
|
|
n = n->right;
|
|
}
|
|
|
|
/*
|
|
* case 5 - parent is red but uncle is black, parent and
|
|
* grandparent on same side
|
|
*/
|
|
n->parent->red = 0;
|
|
n->parent->parent->red = 1;
|
|
if (n == n->parent->left)
|
|
hlist_rotate_right(anchor, n->parent->parent);
|
|
else
|
|
hlist_rotate_left(anchor, n->parent->parent);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Highlight every character in a range of displayed characters.
|
|
*/
|
|
static void create_hilites(POSITION linepos, char *line, char *sp, char *ep, int attr, int *chpos)
|
|
{
|
|
int start_index = sp - line;
|
|
int end_index = ep - line;
|
|
struct hilite hl;
|
|
int i;
|
|
|
|
/* Start the first hilite. */
|
|
hl.hl_startpos = linepos + chpos[start_index];
|
|
hl.hl_attr = attr;
|
|
|
|
/*
|
|
* Step through the displayed chars.
|
|
* If the source position (before cvt) of the char is one more
|
|
* than the source pos of the previous char (the usual case),
|
|
* just increase the size of the current hilite by one.
|
|
* Otherwise (there are backspaces or something involved),
|
|
* finish the current hilite and start a new one.
|
|
*/
|
|
for (i = start_index+1; i <= end_index; i++)
|
|
{
|
|
if (chpos[i] != chpos[i-1] + 1 || i == end_index)
|
|
{
|
|
hl.hl_endpos = linepos + chpos[i-1] + 1;
|
|
add_hilite(&hilite_anchor, &hl);
|
|
/* Start new hilite unless this is the last char. */
|
|
if (i < end_index)
|
|
{
|
|
hl.hl_startpos = linepos + chpos[i];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make a hilite for each string in a physical line which matches
|
|
* the current pattern.
|
|
* sp,ep delimit the first match already found.
|
|
*/
|
|
static void hilite_line(POSITION linepos, char *line, int line_len, int *chpos, char **sp, char **ep, int nsp, int cvt_ops)
|
|
{
|
|
char *searchp;
|
|
char *line_end = line + line_len;
|
|
|
|
/*
|
|
* sp[0] and ep[0] delimit the first match in the line.
|
|
* Mark the corresponding file positions, then
|
|
* look for further matches and mark them.
|
|
* {{ This technique, of calling match_pattern on subsequent
|
|
* substrings of the line, may mark more than is correct
|
|
* if the pattern starts with "^". This bug is fixed
|
|
* for those regex functions that accept a notbol parameter
|
|
* (currently POSIX, PCRE and V8-with-regexec2). }}
|
|
* sp[i] and ep[i] for i>0 delimit subpattern matches.
|
|
* Color each of them with its unique color.
|
|
*/
|
|
searchp = line;
|
|
do {
|
|
char *lep = sp[0];
|
|
int i;
|
|
for (i = 1; i < nsp; i++)
|
|
{
|
|
if (sp[i] == NULL || ep[i] == NULL)
|
|
break;
|
|
if (ep[i] > sp[i])
|
|
{
|
|
create_hilites(linepos, line, lep, sp[i],
|
|
AT_HILITE | AT_COLOR_SEARCH, chpos);
|
|
create_hilites(linepos, line, sp[i], ep[i],
|
|
AT_HILITE | AT_COLOR_SUBSEARCH(i), chpos);
|
|
lep = ep[i];
|
|
}
|
|
}
|
|
create_hilites(linepos, line, lep, ep[0],
|
|
AT_HILITE | AT_COLOR_SEARCH, chpos);
|
|
|
|
/*
|
|
* If we matched more than zero characters,
|
|
* move to the first char after the string we matched.
|
|
* If we matched zero, just move to the next char.
|
|
*/
|
|
if (ep[0] > searchp)
|
|
searchp = ep[0];
|
|
else if (searchp != line_end)
|
|
searchp++;
|
|
else /* end of line */
|
|
break;
|
|
} while (match_pattern(info_compiled(&search_info), search_info.text,
|
|
searchp, line_end - searchp, sp, ep, nsp, 1, search_info.search_type));
|
|
}
|
|
#endif
|
|
|
|
#if HILITE_SEARCH
|
|
/*
|
|
* Find matching text which is currently on screen and highlight it.
|
|
*/
|
|
static void hilite_screen(void)
|
|
{
|
|
struct scrpos scrpos;
|
|
|
|
get_scrpos(&scrpos, TOP);
|
|
if (scrpos.pos == NULL_POSITION)
|
|
return;
|
|
prep_hilite(scrpos.pos, position(BOTTOM_PLUS_ONE), -1);
|
|
repaint_hilite(1);
|
|
}
|
|
|
|
/*
|
|
* Change highlighting parameters.
|
|
*/
|
|
public void chg_hilite(void)
|
|
{
|
|
/*
|
|
* Erase any highlights currently on screen.
|
|
*/
|
|
clr_hilite();
|
|
hide_hilite = 0;
|
|
|
|
if (hilite_search == OPT_ONPLUS)
|
|
/*
|
|
* Display highlights.
|
|
*/
|
|
hilite_screen();
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Figure out where to start a search.
|
|
*/
|
|
static POSITION search_pos(int search_type)
|
|
{
|
|
POSITION pos;
|
|
int sindex;
|
|
|
|
if (empty_screen())
|
|
{
|
|
/*
|
|
* Start at the beginning (or end) of the file.
|
|
* The empty_screen() case is mainly for
|
|
* command line initiated searches;
|
|
* for example, "+/xyz" on the command line.
|
|
* Also for multi-file (SRCH_PAST_EOF) searches.
|
|
*/
|
|
if (search_type & SRCH_FORW)
|
|
{
|
|
pos = ch_zero();
|
|
} else
|
|
{
|
|
pos = ch_length();
|
|
if (pos == NULL_POSITION)
|
|
{
|
|
(void) ch_end_seek();
|
|
pos = ch_length();
|
|
}
|
|
}
|
|
sindex = 0;
|
|
} else
|
|
{
|
|
int add_one = 0;
|
|
|
|
if (how_search == OPT_ON)
|
|
{
|
|
/*
|
|
* Search does not include current screen.
|
|
*/
|
|
if (search_type & SRCH_FORW)
|
|
sindex = sc_height-1; /* BOTTOM_PLUS_ONE */
|
|
else
|
|
sindex = 0; /* TOP */
|
|
} else if (how_search == OPT_ONPLUS && !(search_type & SRCH_AFTER_TARGET))
|
|
{
|
|
/*
|
|
* Search includes all of displayed screen.
|
|
*/
|
|
if (search_type & SRCH_FORW)
|
|
sindex = 0; /* TOP */
|
|
else
|
|
sindex = sc_height-1; /* BOTTOM_PLUS_ONE */
|
|
} else
|
|
{
|
|
/*
|
|
* Search includes the part of current screen beyond the jump target.
|
|
* It starts at the jump target (if searching backwards),
|
|
* or at the jump target plus one (if forwards).
|
|
*/
|
|
sindex = sindex_from_sline(jump_sline);
|
|
if (search_type & SRCH_FORW)
|
|
add_one = 1;
|
|
}
|
|
pos = position(sindex);
|
|
if (add_one)
|
|
pos = forw_raw_line(pos, (char **)NULL, (int *)NULL);
|
|
}
|
|
|
|
/*
|
|
* If the line is empty, look around for a plausible starting place.
|
|
*/
|
|
if (search_type & SRCH_FORW)
|
|
{
|
|
while (pos == NULL_POSITION)
|
|
{
|
|
if (++sindex >= sc_height)
|
|
break;
|
|
pos = position(sindex);
|
|
}
|
|
} else
|
|
{
|
|
while (pos == NULL_POSITION)
|
|
{
|
|
if (--sindex < 0)
|
|
break;
|
|
pos = position(sindex);
|
|
}
|
|
}
|
|
return (pos);
|
|
}
|
|
|
|
/*
|
|
* Check to see if the line matches the filter pattern.
|
|
* If so, add an entry to the filter list.
|
|
*/
|
|
#if HILITE_SEARCH
|
|
static int matches_filters(POSITION pos, char *cline, int line_len, int *chpos, POSITION linepos, char **sp, char **ep, int nsp)
|
|
{
|
|
struct pattern_info *filter;
|
|
|
|
for (filter = filter_infos; filter != NULL; filter = filter->next)
|
|
{
|
|
int line_filter = match_pattern(info_compiled(filter), filter->text,
|
|
cline, line_len, sp, ep, nsp, 0, filter->search_type);
|
|
if (line_filter)
|
|
{
|
|
struct hilite hl;
|
|
hl.hl_startpos = linepos;
|
|
hl.hl_endpos = pos;
|
|
add_hilite(&filter_anchor, &hl);
|
|
free(cline);
|
|
free(chpos);
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Get the position of the first char in the screen line which
|
|
* puts tpos on screen.
|
|
*/
|
|
static POSITION get_lastlinepos(POSITION pos, POSITION tpos, int sheight)
|
|
{
|
|
int nlines;
|
|
|
|
for (nlines = 0;; nlines++)
|
|
{
|
|
POSITION npos = forw_line(pos);
|
|
if (npos > tpos)
|
|
{
|
|
if (nlines < sheight)
|
|
return NULL_POSITION;
|
|
return pos;
|
|
}
|
|
pos = npos;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the segment index of tpos in the line starting at pos.
|
|
* A segment is a string of printable chars that fills the screen width.
|
|
*/
|
|
static int get_seg(POSITION pos, POSITION tpos)
|
|
{
|
|
int seg;
|
|
|
|
for (seg = 0;; seg++)
|
|
{
|
|
POSITION npos = forw_line_seg(pos, FALSE, FALSE, TRUE);
|
|
if (npos > tpos)
|
|
return seg;
|
|
pos = npos;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Search a subset of the file, specified by start/end position.
|
|
*/
|
|
static int search_range(POSITION pos, POSITION endpos, int search_type, int matches, int maxlines, POSITION *plinepos, POSITION *pendpos, POSITION *plastlinepos)
|
|
{
|
|
char *line;
|
|
char *cline;
|
|
int line_len;
|
|
LINENUM linenum;
|
|
#define NSP (NUM_SEARCH_COLORS+2)
|
|
char *sp[NSP];
|
|
char *ep[NSP];
|
|
int line_match;
|
|
int cvt_ops;
|
|
int cvt_len;
|
|
int *chpos;
|
|
POSITION linepos, oldpos;
|
|
int skip_bytes = 0;
|
|
int swidth = sc_width - line_pfx_width();
|
|
int sheight = sc_height - sindex_from_sline(jump_sline);
|
|
|
|
linenum = find_linenum(pos);
|
|
if (nosearch_headers && linenum <= header_lines)
|
|
{
|
|
linenum = header_lines + 1;
|
|
pos = find_pos(linenum);
|
|
}
|
|
if (pos == NULL_POSITION)
|
|
return (-1);
|
|
oldpos = pos;
|
|
/* When the search wraps around, end at starting position. */
|
|
if ((search_type & SRCH_WRAP) && endpos == NULL_POSITION)
|
|
endpos = pos;
|
|
for (;;)
|
|
{
|
|
/*
|
|
* Get lines until we find a matching one or until
|
|
* we hit end-of-file (or beginning-of-file if we're
|
|
* going backwards), or until we hit the end position.
|
|
*/
|
|
if (ABORT_SIGS())
|
|
{
|
|
/*
|
|
* A signal aborts the search.
|
|
*/
|
|
return (-1);
|
|
}
|
|
|
|
if ((endpos != NULL_POSITION && !(search_type & SRCH_WRAP) &&
|
|
(((search_type & SRCH_FORW) && pos >= endpos) ||
|
|
((search_type & SRCH_BACK) && pos <= endpos))) || maxlines == 0)
|
|
{
|
|
/*
|
|
* Reached end position without a match.
|
|
*/
|
|
if (pendpos != NULL)
|
|
*pendpos = pos;
|
|
return (matches);
|
|
}
|
|
if (maxlines > 0)
|
|
maxlines--;
|
|
|
|
if (search_type & SRCH_FORW)
|
|
{
|
|
/*
|
|
* Read the next line, and save the
|
|
* starting position of that line in linepos.
|
|
*/
|
|
linepos = pos;
|
|
pos = forw_raw_line(pos, &line, &line_len);
|
|
if (linenum != 0)
|
|
linenum++;
|
|
} else
|
|
{
|
|
/*
|
|
* Read the previous line and save the
|
|
* starting position of that line in linepos.
|
|
*/
|
|
pos = back_raw_line(pos, &line, &line_len);
|
|
linepos = pos;
|
|
if (linenum != 0)
|
|
linenum--;
|
|
}
|
|
|
|
if (pos == NULL_POSITION)
|
|
{
|
|
/*
|
|
* Reached EOF/BOF without a match.
|
|
*/
|
|
if (search_type & SRCH_WRAP)
|
|
{
|
|
/*
|
|
* The search wraps around the current file, so
|
|
* try to continue at BOF/EOF.
|
|
*/
|
|
if (search_type & SRCH_FORW)
|
|
{
|
|
pos = ch_zero();
|
|
} else
|
|
{
|
|
pos = ch_length();
|
|
if (pos == NULL_POSITION)
|
|
{
|
|
(void) ch_end_seek();
|
|
pos = ch_length();
|
|
}
|
|
}
|
|
if (pos != NULL_POSITION) {
|
|
/*
|
|
* Wrap-around was successful. Clear
|
|
* the flag so we don't wrap again, and
|
|
* continue the search at new pos.
|
|
*/
|
|
search_type &= ~SRCH_WRAP;
|
|
linenum = find_linenum(pos);
|
|
continue;
|
|
}
|
|
}
|
|
if (pendpos != NULL)
|
|
*pendpos = oldpos;
|
|
return (matches);
|
|
}
|
|
|
|
/*
|
|
* If we're using line numbers, we might as well
|
|
* remember the information we have now (the position
|
|
* and line number of the current line).
|
|
* Don't do it for every line because it slows down
|
|
* the search. Remember the line number only if
|
|
* we're "far" from the last place we remembered it.
|
|
*/
|
|
if (linenums && abs((int)(pos - oldpos)) > 2048)
|
|
add_lnum(linenum, pos);
|
|
oldpos = pos;
|
|
|
|
#if HILITE_SEARCH
|
|
if (is_filtered(linepos))
|
|
continue;
|
|
#endif
|
|
if (nosearch_headers)
|
|
skip_bytes = skip_columns(header_cols, &line, &line_len);
|
|
|
|
/*
|
|
* If it's a caseless search, convert the line to lowercase.
|
|
* If we're doing backspace processing, delete backspaces.
|
|
*/
|
|
cvt_ops = get_cvt_ops(search_type);
|
|
cvt_len = cvt_length(line_len, cvt_ops);
|
|
cline = (char *) ecalloc(1, cvt_len);
|
|
chpos = cvt_alloc_chpos(cvt_len);
|
|
cvt_text(cline, line, chpos, &line_len, cvt_ops);
|
|
|
|
#if HILITE_SEARCH
|
|
/*
|
|
* If any filters are in effect, ignore non-matching lines.
|
|
*/
|
|
if (filter_infos != NULL &&
|
|
((search_type & SRCH_FIND_ALL) ||
|
|
prep_startpos == NULL_POSITION ||
|
|
linepos < prep_startpos || linepos >= prep_endpos)) {
|
|
if (matches_filters(pos, cline, line_len, chpos, linepos, sp, ep, NSP))
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Test the next line to see if we have a match.
|
|
* We are successful if we either want a match and got one,
|
|
* or if we want a non-match and got one.
|
|
*/
|
|
if (prev_pattern(&search_info))
|
|
{
|
|
line_match = match_pattern(info_compiled(&search_info), search_info.text,
|
|
cline, line_len, sp, ep, NSP, 0, search_type);
|
|
if (line_match)
|
|
{
|
|
/*
|
|
* Got a match.
|
|
*/
|
|
if (search_type & SRCH_FIND_ALL)
|
|
{
|
|
#if HILITE_SEARCH
|
|
/*
|
|
* We are supposed to find all matches in the range.
|
|
* Just add the matches in this line to the
|
|
* hilite list and keep searching.
|
|
*/
|
|
hilite_line(linepos + skip_bytes, cline, line_len, chpos, sp, ep, NSP, cvt_ops);
|
|
#endif
|
|
} else if (--matches <= 0)
|
|
{
|
|
/*
|
|
* Found the one match we're looking for.
|
|
* Return it.
|
|
*/
|
|
#if HILITE_SEARCH
|
|
if (hilite_search == OPT_ON)
|
|
{
|
|
/*
|
|
* Clear the hilite list and add only
|
|
* the matches in this one line.
|
|
*/
|
|
clr_hilite();
|
|
hilite_line(linepos + skip_bytes, cline, line_len, chpos, sp, ep, NSP, cvt_ops);
|
|
}
|
|
#endif
|
|
if (chop_line())
|
|
{
|
|
/*
|
|
* If necessary, shift horizontally to make sure
|
|
* search match is fully visible.
|
|
*/
|
|
if (sp[0] != NULL && ep[0] != NULL)
|
|
{
|
|
int start_off = sp[0] - cline;
|
|
int end_off = ep[0] - cline;
|
|
int save_hshift = hshift;
|
|
int sshift;
|
|
int eshift;
|
|
hshift = 0; /* make get_seg count screen lines */
|
|
sshift = swidth * get_seg(linepos, linepos + chpos[start_off]);
|
|
eshift = swidth * get_seg(linepos, linepos + chpos[end_off]);
|
|
if (sshift >= save_hshift && eshift <= save_hshift)
|
|
{
|
|
hshift = save_hshift;
|
|
} else
|
|
{
|
|
hshift = sshift;
|
|
screen_trashed = 1;
|
|
}
|
|
}
|
|
} else if (plastlinepos != NULL)
|
|
{
|
|
/*
|
|
* If the line is so long that the highlighted match
|
|
* won't be seen when the line is displayed normally
|
|
* (starting at the first char) because it fills the whole
|
|
* screen and more, scroll forward until the last char
|
|
* of the match appears in the last line on the screen.
|
|
* lastlinepos is the position of the first char of that last line.
|
|
*/
|
|
if (ep[0] != NULL)
|
|
{
|
|
int end_off = ep[0] - cline;
|
|
if (end_off >= swidth * sheight / 4) /* heuristic */
|
|
*plastlinepos = get_lastlinepos(linepos, linepos + chpos[end_off], sheight);
|
|
}
|
|
}
|
|
free(cline);
|
|
free(chpos);
|
|
if (plinepos != NULL)
|
|
*plinepos = linepos;
|
|
return (0);
|
|
}
|
|
}
|
|
}
|
|
free(cline);
|
|
free(chpos);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* search for a pattern in history. If found, compile that pattern.
|
|
*/
|
|
static int hist_pattern(int search_type)
|
|
{
|
|
#if CMD_HISTORY
|
|
char *pattern;
|
|
|
|
set_mlist(ml_search, 0);
|
|
pattern = cmd_lastpattern();
|
|
if (pattern == NULL)
|
|
return (0);
|
|
|
|
if (set_pattern(&search_info, pattern, search_type, 1) < 0)
|
|
return (-1);
|
|
|
|
#if HILITE_SEARCH
|
|
if (hilite_search == OPT_ONPLUS && !hide_hilite)
|
|
hilite_screen();
|
|
#endif
|
|
|
|
return (1);
|
|
#else /* CMD_HISTORY */
|
|
return (0);
|
|
#endif /* CMD_HISTORY */
|
|
}
|
|
|
|
/*
|
|
* Change the caseless-ness of searches.
|
|
* Updates the internal search state to reflect a change in the -i flag.
|
|
*/
|
|
public void chg_caseless(void)
|
|
{
|
|
if (!search_info.is_ucase_pattern)
|
|
{
|
|
/*
|
|
* Pattern did not have uppercase.
|
|
* Set the search caselessness to the global caselessness.
|
|
*/
|
|
is_caseless = caseless;
|
|
/*
|
|
* If regex handles caseless, we need to discard
|
|
* the pattern which was compiled with the old caseless.
|
|
*/
|
|
if (!re_handles_caseless)
|
|
/* We handle caseless, so the pattern doesn't change. */
|
|
return;
|
|
}
|
|
/*
|
|
* Regenerate the pattern using the new state.
|
|
*/
|
|
clear_pattern(&search_info);
|
|
(void) hist_pattern(search_info.search_type);
|
|
}
|
|
|
|
/*
|
|
* Search for the n-th occurrence of a specified pattern,
|
|
* either forward or backward.
|
|
* Return the number of matches not yet found in this file
|
|
* (that is, n minus the number of matches found).
|
|
* Return -1 if the search should be aborted.
|
|
* Caller may continue the search in another file
|
|
* if less than n matches are found in this file.
|
|
*/
|
|
public int search(int search_type, char *pattern, int n)
|
|
{
|
|
POSITION pos;
|
|
POSITION opos;
|
|
POSITION lastlinepos = NULL_POSITION;
|
|
|
|
if (pattern == NULL || *pattern == '\0')
|
|
{
|
|
/*
|
|
* A null pattern means use the previously compiled pattern.
|
|
*/
|
|
search_type |= SRCH_AFTER_TARGET;
|
|
if (!prev_pattern(&search_info))
|
|
{
|
|
int r = hist_pattern(search_type);
|
|
if (r == 0)
|
|
error("No previous regular expression", NULL_PARG);
|
|
if (r <= 0)
|
|
return (-1);
|
|
}
|
|
if ((search_type & SRCH_NO_REGEX) !=
|
|
(search_info.search_type & SRCH_NO_REGEX))
|
|
{
|
|
error("Please re-enter search pattern", NULL_PARG);
|
|
return -1;
|
|
}
|
|
#if HILITE_SEARCH
|
|
if (hilite_search == OPT_ON || status_col)
|
|
{
|
|
/*
|
|
* Erase the highlights currently on screen.
|
|
* If the search fails, we'll redisplay them later.
|
|
*/
|
|
repaint_hilite(0);
|
|
}
|
|
if (hilite_search == OPT_ONPLUS && hide_hilite)
|
|
{
|
|
/*
|
|
* Highlight any matches currently on screen,
|
|
* before we actually start the search.
|
|
*/
|
|
hide_hilite = 0;
|
|
hilite_screen();
|
|
}
|
|
hide_hilite = 0;
|
|
#endif
|
|
} else
|
|
{
|
|
/*
|
|
* Compile the pattern.
|
|
*/
|
|
int show_error = !(search_type & SRCH_INCR);
|
|
if (set_pattern(&search_info, pattern, search_type, show_error) < 0)
|
|
return (-1);
|
|
#if HILITE_SEARCH
|
|
if (hilite_search || status_col)
|
|
{
|
|
/*
|
|
* Erase the highlights currently on screen.
|
|
* Also permanently delete them from the hilite list.
|
|
*/
|
|
repaint_hilite(0);
|
|
hide_hilite = 0;
|
|
clr_hilite();
|
|
}
|
|
if (hilite_search == OPT_ONPLUS || status_col)
|
|
{
|
|
/*
|
|
* Highlight any matches currently on screen,
|
|
* before we actually start the search.
|
|
*/
|
|
hilite_screen();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Figure out where to start the search.
|
|
*/
|
|
pos = search_pos(search_type);
|
|
opos = position(sindex_from_sline(jump_sline));
|
|
if (pos == NULL_POSITION)
|
|
{
|
|
/*
|
|
* Can't find anyplace to start searching from.
|
|
*/
|
|
if (search_type & SRCH_PAST_EOF)
|
|
return (n);
|
|
#if HILITE_SEARCH
|
|
if (hilite_search == OPT_ON || status_col)
|
|
repaint_hilite(1);
|
|
#endif
|
|
error("Nothing to search", NULL_PARG);
|
|
return (-1);
|
|
}
|
|
|
|
n = search_range(pos, NULL_POSITION, search_type, n, -1,
|
|
&pos, (POSITION*)NULL, &lastlinepos);
|
|
if (n != 0)
|
|
{
|
|
/*
|
|
* Search was unsuccessful.
|
|
*/
|
|
#if HILITE_SEARCH
|
|
if ((hilite_search == OPT_ON || status_col) && n > 0)
|
|
/*
|
|
* Redisplay old hilites.
|
|
*/
|
|
repaint_hilite(1);
|
|
#endif
|
|
return (n);
|
|
}
|
|
|
|
if (!(search_type & SRCH_NO_MOVE))
|
|
{
|
|
/*
|
|
* Go to the matching line.
|
|
*/
|
|
if (lastlinepos != NULL_POSITION)
|
|
jump_loc(lastlinepos, BOTTOM);
|
|
else if (pos != opos)
|
|
jump_loc(pos, jump_sline);
|
|
}
|
|
|
|
#if HILITE_SEARCH
|
|
if (hilite_search == OPT_ON || status_col)
|
|
/*
|
|
* Display new hilites in the matching line.
|
|
*/
|
|
repaint_hilite(1);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
#if HILITE_SEARCH
|
|
/*
|
|
* Prepare hilites in a given range of the file.
|
|
*
|
|
* The pair (prep_startpos,prep_endpos) delimits a contiguous region
|
|
* of the file that has been "prepared"; that is, scanned for matches for
|
|
* the current search pattern, and hilites have been created for such matches.
|
|
* If prep_startpos == NULL_POSITION, the prep region is empty.
|
|
* If prep_endpos == NULL_POSITION, the prep region extends to EOF.
|
|
* prep_hilite asks that the range (spos,epos) be covered by the prep region.
|
|
*/
|
|
public void prep_hilite(POSITION spos, POSITION epos, int maxlines)
|
|
{
|
|
POSITION nprep_startpos = prep_startpos;
|
|
POSITION nprep_endpos = prep_endpos;
|
|
POSITION new_epos;
|
|
POSITION max_epos;
|
|
int result;
|
|
int i;
|
|
|
|
/*
|
|
* Search beyond where we're asked to search, so the prep region covers
|
|
* more than we need. Do one big search instead of a bunch of small ones.
|
|
*/
|
|
#define SEARCH_MORE (3*size_linebuf)
|
|
|
|
if (!prev_pattern(&search_info) && !is_filtering())
|
|
return;
|
|
|
|
/*
|
|
* Make sure our prep region always starts at the beginning of
|
|
* a line. (search_range takes care of the end boundary below.)
|
|
*/
|
|
spos = back_raw_line(spos+1, (char **)NULL, (int *)NULL);
|
|
|
|
/*
|
|
* If we're limited to a max number of lines, figure out the
|
|
* file position we should stop at.
|
|
*/
|
|
if (maxlines < 0)
|
|
max_epos = NULL_POSITION;
|
|
else
|
|
{
|
|
max_epos = spos;
|
|
for (i = 0; i < maxlines; i++)
|
|
max_epos = forw_raw_line(max_epos, (char **)NULL, (int *)NULL);
|
|
}
|
|
|
|
/*
|
|
* Find two ranges:
|
|
* The range that we need to search (spos,epos); and the range that
|
|
* the "prep" region will then cover (nprep_startpos,nprep_endpos).
|
|
*/
|
|
|
|
if (prep_startpos == NULL_POSITION ||
|
|
(epos != NULL_POSITION && epos < prep_startpos) ||
|
|
spos > prep_endpos)
|
|
{
|
|
/*
|
|
* New range is not contiguous with old prep region.
|
|
* Discard the old prep region and start a new one.
|
|
*/
|
|
clr_hilite();
|
|
clr_filter();
|
|
if (epos != NULL_POSITION)
|
|
epos += SEARCH_MORE;
|
|
nprep_startpos = spos;
|
|
} else
|
|
{
|
|
/*
|
|
* New range partially or completely overlaps old prep region.
|
|
*/
|
|
if (epos == NULL_POSITION)
|
|
{
|
|
/*
|
|
* New range goes to end of file.
|
|
*/
|
|
;
|
|
} else if (epos > prep_endpos)
|
|
{
|
|
/*
|
|
* New range ends after old prep region.
|
|
* Extend prep region to end at end of new range.
|
|
*/
|
|
epos += SEARCH_MORE;
|
|
} else /* (epos <= prep_endpos) */
|
|
{
|
|
/*
|
|
* New range ends within old prep region.
|
|
* Truncate search to end at start of old prep region.
|
|
*/
|
|
epos = prep_startpos;
|
|
}
|
|
|
|
if (spos < prep_startpos)
|
|
{
|
|
/*
|
|
* New range starts before old prep region.
|
|
* Extend old prep region backwards to start at
|
|
* start of new range.
|
|
*/
|
|
if (spos < SEARCH_MORE)
|
|
spos = 0;
|
|
else
|
|
spos -= SEARCH_MORE;
|
|
nprep_startpos = spos;
|
|
} else /* (spos >= prep_startpos) */
|
|
{
|
|
/*
|
|
* New range starts within or after old prep region.
|
|
* Trim search to start at end of old prep region.
|
|
*/
|
|
spos = prep_endpos;
|
|
}
|
|
}
|
|
|
|
if (epos != NULL_POSITION && max_epos != NULL_POSITION &&
|
|
epos > max_epos)
|
|
/*
|
|
* Don't go past the max position we're allowed.
|
|
*/
|
|
epos = max_epos;
|
|
|
|
if (epos == NULL_POSITION || epos > spos)
|
|
{
|
|
int search_type = SRCH_FORW | SRCH_FIND_ALL;
|
|
search_type |= (search_info.search_type & (SRCH_NO_REGEX|SRCH_SUBSEARCH_ALL));
|
|
for (;;)
|
|
{
|
|
result = search_range(spos, epos, search_type, 0, maxlines, (POSITION*)NULL, &new_epos, (POSITION*)NULL);
|
|
if (result < 0)
|
|
return;
|
|
if (prep_endpos == NULL_POSITION || new_epos > prep_endpos)
|
|
nprep_endpos = new_epos;
|
|
|
|
/*
|
|
* Check both ends of the resulting prep region to
|
|
* make sure they're not filtered. If they are,
|
|
* keep going at least one more line until we find
|
|
* something that isn't filtered, or hit the end.
|
|
*/
|
|
if (prep_endpos == NULL_POSITION || nprep_endpos > prep_endpos)
|
|
{
|
|
if (new_epos >= nprep_endpos && is_filtered(new_epos-1))
|
|
{
|
|
spos = nprep_endpos;
|
|
epos = forw_raw_line(nprep_endpos, (char **)NULL, (int *)NULL);
|
|
if (epos == NULL_POSITION)
|
|
break;
|
|
maxlines = 1;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (prep_startpos == NULL_POSITION || nprep_startpos < prep_startpos)
|
|
{
|
|
if (nprep_startpos > 0 && is_filtered(nprep_startpos))
|
|
{
|
|
epos = nprep_startpos;
|
|
spos = back_raw_line(nprep_startpos, (char **)NULL, (int *)NULL);
|
|
if (spos == NULL_POSITION)
|
|
break;
|
|
nprep_startpos = spos;
|
|
maxlines = 1;
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
prep_startpos = nprep_startpos;
|
|
prep_endpos = nprep_endpos;
|
|
}
|
|
|
|
/*
|
|
* Set the pattern to be used for line filtering.
|
|
*/
|
|
public void set_filter_pattern(char *pattern, int search_type)
|
|
{
|
|
struct pattern_info *filter;
|
|
|
|
clr_filter();
|
|
if (pattern == NULL || *pattern == '\0')
|
|
{
|
|
/* Clear and free all filters. */
|
|
for (filter = filter_infos; filter != NULL; )
|
|
{
|
|
struct pattern_info *next_filter = filter->next;
|
|
clear_pattern(filter);
|
|
free(filter);
|
|
filter = next_filter;
|
|
}
|
|
filter_infos = NULL;
|
|
} else
|
|
{
|
|
/* Create a new filter and add it to the filter_infos list. */
|
|
filter = ecalloc(1, sizeof(struct pattern_info));
|
|
init_pattern(filter);
|
|
if (set_pattern(filter, pattern, search_type, 1) < 0)
|
|
{
|
|
free(filter);
|
|
return;
|
|
}
|
|
filter->next = filter_infos;
|
|
filter_infos = filter;
|
|
}
|
|
screen_trashed = 1;
|
|
}
|
|
|
|
/*
|
|
* Is there a line filter in effect?
|
|
*/
|
|
public int is_filtering(void)
|
|
{
|
|
if (ch_getflags() & CH_HELPFILE)
|
|
return (0);
|
|
return (filter_infos != NULL);
|
|
}
|
|
#endif
|
|
|
|
#if HAVE_V8_REGCOMP
|
|
/*
|
|
* This function is called by the V8 regcomp to report
|
|
* errors in regular expressions.
|
|
*/
|
|
public int reg_show_error = 1;
|
|
|
|
void regerror(char *s)
|
|
{
|
|
PARG parg;
|
|
|
|
if (!reg_show_error)
|
|
return;
|
|
parg.p_string = s;
|
|
error("%s", &parg);
|
|
}
|
|
#endif
|
|
|