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428
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1 /* Copyright (c) 1994, 1995 Free Software Foundation.
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2 Copyright (c) 1995 Ben Wing.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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440
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23 #ifndef INCLUDED_extents_h_
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24 #define INCLUDED_extents_h_
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428
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25
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26 DECLARE_LRECORD (extent, struct extent);
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27 #define XEXTENT(x) XRECORD (x, extent, struct extent)
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28 #define XSETEXTENT(x, p) XSETRECORD (x, p, extent)
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29 #define EXTENTP(x) RECORDP (x, extent)
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30 #define CHECK_EXTENT(x) CHECK_RECORD (x, extent)
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31 #define CONCHECK_EXTENT(x) CONCHECK_RECORD (x, extent)
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32
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33 /* the layouts for glyphs (extent->flags.glyph_layout). Must fit in 2 bits. */
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34 typedef enum glyph_layout
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35 {
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36 GL_TEXT,
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37 GL_OUTSIDE_MARGIN,
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38 GL_INSIDE_MARGIN,
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39 GL_WHITESPACE
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40 } glyph_layout;
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41
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42 struct extent
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43 {
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44 struct lrecord_header lheader;
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45
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46 Memind start;
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47 Memind end;
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48 Lisp_Object object; /* A buffer, string, Qnil (extent detached from no
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49 buffer), Qt (destroyed extent) */
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50
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51 /* Extent properties are conceptually a plist, but the most common
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52 props are implemented as bits instead of conses. */
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53 struct
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54 {
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55 Lisp_Object face;
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56
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57 /* These flags are simply an optimization for common boolean properties
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58 which go onto the extent's property list. Any of them would work if
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59 done in the normal way, but the space savings of doing these in this
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60 way is significant. Note that if you add a flag, there are numerous
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61 places in extents.c that need to know about it.
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62
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63 Another consideration is that some of these properties are accessed
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64 during redisplay, so it's good for access to them to be fast (a bit
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65 reference instead of a search down a plist).
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66
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67 `begin_glyph_layout' and `end_glyph_layout' are unusual in that
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68 they have 4 states instead of 2.
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69
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70 Other special extent properties are stored in an auxiliary
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71 structure that sits at the beginning of the plist. The has_aux
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72 flag indicates whether this structure exists. The has_parent
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73 flag is an optimization indicating whether the extent has a parent
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74 (this could also be determined by looking in the aux structure). */
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75
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76 enum_field (glyph_layout) begin_glyph_layout :2;
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77 /* 2 text, margins, or whitespace */
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78 enum_field (glyph_layout) end_glyph_layout :2;
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79 /* 4 text, margins, or whitespace */
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80 unsigned int has_parent :1; /* 5 extent has a parent */
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81 unsigned int has_aux :1; /* 6 extent has an aux. structure */
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82 unsigned int start_open :1; /* 7 insertion behavior at start */
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83 unsigned int end_open :1; /* 8 insertion behavior at end */
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84 unsigned int unique :1; /* 9 there may be only one attached */
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85 unsigned int duplicable :1; /* 10 copied to strings by kill/undo */
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86 unsigned int detachable :1; /* 11 extent detaches if text deleted */
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87 unsigned int internal :1; /* 12 used by map-extents etc. */
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88 unsigned int in_red_event :1; /* 13 An event has been spawned for
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89 initial redisplay.
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90 (not exported to lisp) */
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91 unsigned int unused16 :1; /* 16 unused bits */
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92 /* --- Adding more flags will cause the extent struct to grow by another
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93 word. It's not clear that this would make a difference, however,
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94 because on 32-bit machines things tend to get allocated in chunks
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95 of 4 bytes. */
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96 } flags;
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97 /* The plist may have an auxiliary structure as its first element */
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98 Lisp_Object plist;
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99 };
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100
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101 /* Basic properties of an extent (not affected by the extent's parent) */
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102 #define extent_object(e) ((e)->object)
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103 #define extent_start(e) ((e)->start + 0)
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104 #define extent_end(e) ((e)->end + 0)
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105 #define set_extent_start(e, val) ((void) ((e)->start = (val)))
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106 #define set_extent_end(e, val) ((void) ((e)->end = (val)))
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107 #define extent_endpoint(e, endp) ((endp) ? extent_end (e) : extent_start (e))
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108 #define set_extent_endpoint(e, val, endp) \
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109 ((endp) ? set_extent_end (e, val) : set_extent_start (e, val))
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110 #define extent_detached_p(e) (extent_start (e) < 0)
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111
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112 /* Additional information that may be present in an extent. The idea is
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113 that fast access is provided to this information, but since (hopefully)
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114 most extents won't have this set on them, we usually don't need to
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115 have this structure around and thus the size of an extent is smaller. */
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116
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117 typedef struct extent_auxiliary extent_auxiliary;
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118 struct extent_auxiliary
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119 {
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120 struct lcrecord_header header;
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121
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122 Lisp_Object begin_glyph;
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123 Lisp_Object end_glyph;
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124 Lisp_Object parent;
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125 /* We use a weak list here. Originally I didn't do this and
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126 depended on having the extent's finalization method remove
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127 itself from its parent's children list. This runs into
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128 lots and lots of problems though because everything is in
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129 a really really bizarre state when an extent's finalization
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130 method is called (it happens in sweep_extents() by way of
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131 ADDITIONAL_FREE_extent()) and it's extremely difficult to
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132 avoid getting hosed by just-freed objects. */
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133 Lisp_Object children;
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134 Lisp_Object invisible;
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135 Lisp_Object read_only;
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136 Lisp_Object mouse_face;
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137 Lisp_Object initial_redisplay_function;
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138 Lisp_Object before_change_functions, after_change_functions;
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139 int priority;
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140 };
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141
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142 extern struct extent_auxiliary extent_auxiliary_defaults;
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143
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144 DECLARE_LRECORD (extent_auxiliary, struct extent_auxiliary);
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145 #define XEXTENT_AUXILIARY(x) \
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146 XRECORD (x, extent_auxiliary, struct extent_auxiliary)
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147 #define XSETEXTENT_AUXILIARY(x, p) XSETRECORD (x, p, extent_auxiliary)
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148 #define EXTENT_AUXILIARYP(x) RECORDP (x, extent_auxiliary)
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149 #define CHECK_EXTENT_AUXILIARY(x) CHECK_RECORD (x, extent_auxiliary)
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150 #define CONCHECK_EXTENT_AUXILIARY(x) CONCHECK_RECORD (x, extent_auxiliary)
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151
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152 struct extent_info
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153 {
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154 struct lcrecord_header header;
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155
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156 struct extent_list *extents;
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157 struct stack_of_extents *soe;
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158 };
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159
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160 DECLARE_LRECORD (extent_info, struct extent_info);
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161 #define XEXTENT_INFO(x) XRECORD (x, extent_info, struct extent_info)
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162 #define XSETEXTENT_INFO(x, p) XSETRECORD (x, p, extent_info)
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163 #define EXTENT_INFOP(x) RECORDP (x, extent_info)
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164 #define CHECK_EXTENT_INFO(x) CHECK_RECORD (x, extent_info)
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165 #define CONCHECK_EXTENT_INFO(x) CONCHECK_RECORD (x, extent_info)
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166
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167 void flush_cached_extent_info (Lisp_Object extent_info);
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168
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169 /* A "normal" field is one that is stored in the `struct flags' structure
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170 in an extent. an "aux" field is one that is stored in the extent's
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171 auxiliary structure.
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172
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173 The functions below that have `extent_no_chase' in their name operate
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174 on an extent directly (ignoring its parent), and should normally
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175 only be used on extents known not to have a parent. The other
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176 versions chase down any parent links. */
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177
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178 #define extent_no_chase_normal_field(e, field) ((e)->flags.field)
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179
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442
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180 INLINE_HEADER struct extent_auxiliary *extent_aux_or_default (EXTENT e);
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181 INLINE_HEADER struct extent_auxiliary *
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428
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182 extent_aux_or_default (EXTENT e)
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183 {
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184 return e->flags.has_aux ?
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185 XEXTENT_AUXILIARY (XCAR (e->plist)) :
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186 & extent_auxiliary_defaults;
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187 }
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188
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189 #define extent_no_chase_aux_field(e, field) (extent_aux_or_default(e)->field)
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190
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191 #define extent_normal_field(e, field) \
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192 extent_no_chase_normal_field (extent_ancestor (e), field)
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193
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194 #define extent_aux_field(e, field) \
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195 extent_no_chase_aux_field (extent_ancestor (e), field)
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196
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197 #define set_extent_no_chase_aux_field(e, field, value) do { \
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198 EXTENT sencaf_e = (e); \
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199 if (! sencaf_e->flags.has_aux) \
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200 allocate_extent_auxiliary (sencaf_e); \
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201 XEXTENT_AUXILIARY (XCAR (sencaf_e->plist))->field = (value);\
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202 } while (0)
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203
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204 #define set_extent_no_chase_normal_field(e, field, value) \
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205 extent_no_chase_normal_field (e, field) = (value)
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206
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207 #define set_extent_aux_field(e, field, value) \
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208 set_extent_no_chase_aux_field (extent_ancestor (e), field, value)
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209
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210 #define set_extent_normal_field(e, field, value) \
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211 set_extent_ancestor_normal_field (extent_no_chase (e), field, value)
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212
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213 /* The `parent' and `children' fields are not affected by any
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214 parent links. We don't provide any settors for these fields
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215 because they need special handling and it's cleaner just to
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216 do this in the particular functions that need to do this. */
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217
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218 #define extent_parent(e) extent_no_chase_aux_field (e, parent)
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219 #define extent_children(e) extent_no_chase_aux_field (e, children)
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220
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221 #define extent_begin_glyph(e) extent_aux_field (e, begin_glyph)
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222 #define extent_end_glyph(e) extent_aux_field (e, end_glyph)
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223 #define extent_priority(e) extent_aux_field (e, priority)
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224 #define extent_invisible(e) extent_aux_field (e, invisible)
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225 #define extent_read_only(e) extent_aux_field (e, read_only)
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226 #define extent_mouse_face(e) extent_aux_field (e, mouse_face)
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227 #define extent_initial_redisplay_function(e) extent_aux_field (e, initial_redisplay_function)
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228 #define extent_before_change_functions(e) extent_aux_field (e, before_change_functions)
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229 #define extent_after_change_functions(e) extent_aux_field (e, after_change_functions)
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230
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231 #define set_extent_begin_glyph(e, value) \
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232 set_extent_aux_field (e, begin_glyph, value)
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233 #define set_extent_end_glyph(e, value) \
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234 set_extent_aux_field (e, end_glyph, value)
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235 #define set_extent_priority(e, value) \
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236 set_extent_aux_field (e, priority, value)
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237 #define set_extent_invisible_1(e, value) \
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238 set_extent_aux_field (e, invisible, value)
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239 #define set_extent_read_only(e, value) \
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240 set_extent_aux_field (e, read_only, value)
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241 #define set_extent_mouse_face(e, value) \
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242 set_extent_aux_field (e, mouse_face, value)
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243 /* Use Fset_extent_initial_redisplay_function unless you know what you're doing */
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244 #define set_extent_initial_redisplay_function(e, value) \
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245 set_extent_aux_field (e, initial_redisplay_function, value)
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246 #define set_extent_before_change_functions(e, value) \
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247 set_extent_aux_field (e, before_change_functions, value)
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248 #define set_extent_after_change_functions(e, value) \
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249 set_extent_aux_field (e, after_change_functions, value)
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250
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251 #define extent_face(e) extent_normal_field (e, face)
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252 #define extent_begin_glyph_layout(e) extent_normal_field (e, begin_glyph_layout)
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253 #define extent_end_glyph_layout(e) extent_normal_field (e, end_glyph_layout)
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254 #define extent_start_open_p(e) extent_normal_field (e, start_open)
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255 #define extent_end_open_p(e) extent_normal_field (e, end_open)
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256 #define extent_unique_p(e) extent_normal_field (e, unique)
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257 #define extent_duplicable_p(e) extent_normal_field (e, duplicable)
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258 #define extent_detachable_p(e) extent_normal_field (e, detachable)
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259 #define extent_internal_p(e) extent_normal_field (e, internal)
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260 #define extent_in_red_event_p(e) extent_normal_field (e, in_red_event)
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261
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442
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262 INLINE_HEADER Lisp_Object * extent_no_chase_plist_addr (EXTENT e);
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263 INLINE_HEADER Lisp_Object *
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428
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264 extent_no_chase_plist_addr (EXTENT e)
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265 {
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266 return e->flags.has_aux ? &XCDR (e->plist) : &e->plist;
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267 }
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268
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269 #define extent_no_chase_plist(e) (*extent_no_chase_plist_addr (e))
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270
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271 #define extent_plist_addr(e) extent_no_chase_plist_addr (extent_ancestor (e))
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272 #define extent_plist_slot(e) extent_no_chase_plist (extent_ancestor (e))
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273
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274 /* flags for map_extents() and friends */
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275 #define ME_END_CLOSED (1 << 0)
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276 #define ME_START_OPEN (1 << 1)
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277 #define ME_ALL_EXTENTS_CLOSED (1 << 2)
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278 #define ME_ALL_EXTENTS_OPEN (2 << 2)
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279 #define ME_ALL_EXTENTS_CLOSED_OPEN (3 << 2)
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280 #define ME_ALL_EXTENTS_OPEN_CLOSED (4 << 2)
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281 #define ME_ALL_EXTENTS_MASK (7 << 2)
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282 #define ME_START_IN_REGION (1 << 5)
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283 #define ME_END_IN_REGION (2 << 5)
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284 #define ME_START_AND_END_IN_REGION (3 << 5)
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285 #define ME_START_OR_END_IN_REGION (4 << 5)
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286 #define ME_IN_REGION_MASK (7 << 5)
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287 #define ME_NEGATE_IN_REGION (1 << 8)
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288 /* the following flags are internal-only */
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289 #define ME_INCLUDE_INTERNAL (1 << 9)
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290 #define ME_MIGHT_THROW (1 << 10)
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291 #define ME_MIGHT_MODIFY_TEXT (1 << 11)
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292 #define ME_MIGHT_MODIFY_EXTENTS (1 << 12)
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293 #define ME_MIGHT_MOVE_SOE (1 << 13)
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294 #define ME_MIGHT_CALL_ELISP (ME_MIGHT_THROW | ME_MIGHT_MODIFY_TEXT | \
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295 ME_MIGHT_MODIFY_EXTENTS | ME_MIGHT_MOVE_SOE)
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296
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297
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298 #define EXTENT_LIVE_P(e) (!EQ (extent_object (e), Qt))
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299
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300 #define CHECK_LIVE_EXTENT(x) do { \
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301 CHECK_EXTENT (x); \
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302 if (!EXTENT_LIVE_P (XEXTENT (x))) \
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303 dead_wrong_type_argument (Qextent_live_p, (x)); \
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304 } while (0)
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305 #define CONCHECK_LIVE_EXTENT(x) do { \
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306 CONCHECK_EXTENT (x); \
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307 if (!EXTENT_LIVE_P (XEXTENT (x))) \
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308 x = wrong_type_argument (Qextent_live_p, (x)); \
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309 } while (0)
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310
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311 EXFUN (Fdetach_extent, 1);
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312 EXFUN (Fextent_end_position, 1);
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313 EXFUN (Fextent_object, 1);
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314 EXFUN (Fextent_start_position, 1);
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315 EXFUN (Fmake_extent, 3);
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316 EXFUN (Fprevious_single_property_change, 4);
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317 EXFUN (Fset_extent_endpoints, 4);
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460
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318 EXFUN (Fnext_extent_change, 2);
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319 EXFUN (Fprevious_extent_change, 2);
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428
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320 EXFUN (Fset_extent_parent, 2);
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460
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321 EXFUN (Fget_char_property, 4);
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428
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322
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323 extern int inside_undo;
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442
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324 extern int in_modeline_generation;
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428
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325
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326 struct extent_fragment *extent_fragment_new (Lisp_Object buffer_or_string,
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327 struct frame *frm);
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328 face_index extent_fragment_update (struct window *w,
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329 struct extent_fragment *ef,
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330 /* Note this is in Bytinds */
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331 Bytind pos);
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332 void extent_fragment_delete (struct extent_fragment *ef);
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333
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334
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335 #ifdef emacs /* things other than emacs want the structs */
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336
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337 /* from alloc.c */
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338 struct extent *allocate_extent (void);
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339
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340 /* from extents.c */
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341 EXTENT extent_ancestor_1 (EXTENT e);
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342
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343 /* extent_ancestor() chases all the parent links until there aren't any
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344 more. extent_ancestor_1() does the same thing but it a function;
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345 the following optimizes the most common case. */
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442
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346 INLINE_HEADER EXTENT extent_ancestor (EXTENT e);
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347 INLINE_HEADER EXTENT
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428
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348 extent_ancestor (EXTENT e)
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349 {
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350 return e->flags.has_parent ? extent_ancestor_1 (e) : e;
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351 }
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352
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353 void allocate_extent_auxiliary (EXTENT ext);
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354 void init_buffer_extents (struct buffer *b);
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355 void uninit_buffer_extents (struct buffer *b);
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356 typedef int (*map_extents_fun) (EXTENT extent, void *arg);
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357 void map_extents (Bufpos from, Bufpos to, map_extents_fun fn,
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358 void *arg, Lisp_Object obj, EXTENT after,
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359 unsigned int flags);
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360
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361 /* Note the following five functions are NOT in Bufpos's */
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362 void adjust_extents (Lisp_Object object, Memind from,
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363 Memind to, int amount);
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364 void adjust_extents_for_deletion (Lisp_Object object, Bytind from,
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365 Bytind to, int gapsize,
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366 int numdel, int movegapsize);
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367 void verify_extent_modification (Lisp_Object object, Bytind from,
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368 Bytind to,
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369 Lisp_Object inhibit_read_only_value);
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370 void process_extents_for_insertion (Lisp_Object object,
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371 Bytind opoint, Bytecount length);
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372 void process_extents_for_deletion (Lisp_Object object, Bytind from,
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373 Bytind to, int destroy_them);
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438
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374 void report_extent_modification (Lisp_Object, Bufpos, Bufpos, int);
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428
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375
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376 void set_extent_glyph (EXTENT extent, Lisp_Object glyph, int endp,
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377 glyph_layout layout);
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378
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379 void add_string_extents (Lisp_Object string, struct buffer *buf,
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380 Bytind opoint, Bytecount length);
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381 void splice_in_string_extents (Lisp_Object string, struct buffer *buf,
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382 Bytind opoint, Bytecount length,
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383 Bytecount pos);
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384 void copy_string_extents (Lisp_Object new_string,
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385 Lisp_Object old_string,
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386 Bytecount new_pos, Bytecount old_pos,
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387 Bytecount length);
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388
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389 void detach_all_extents (Lisp_Object object);
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390 void set_extent_endpoints (EXTENT extent, Bytind s, Bytind e,
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391 Lisp_Object object);
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392
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393 #ifdef ERROR_CHECK_EXTENTS
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394 void sledgehammer_extent_check (Lisp_Object obj);
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395 #endif
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396
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397 #ifdef MEMORY_USAGE_STATS
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398 int compute_buffer_extent_usage (struct buffer *b,
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399 struct overhead_stats *ovstats);
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400 #endif
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401
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402 #endif /* emacs */
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403
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440
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404 #endif /* INCLUDED_extents_h_ */
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