Mercurial > vim
annotate runtime/doc/textprop.txt @ 24226:f49f80a0905d v8.2.2654
patch 8.2.2654: Vim9: getting a character from a string can be slow
Commit: https://github.com/vim/vim/commit/ff871400461183010d3ab98f3f326e4bb75e221b
Author: Bram Moolenaar <Bram@vim.org>
Date: Fri Mar 26 13:34:05 2021 +0100
patch 8.2.2654: Vim9: getting a character from a string can be slow
Problem: Vim9: getting a character from a string can be slow.
Solution: Avoid a function call to get the character byte size. (https://github.com/vim/vim/issues/8000)
author | Bram Moolenaar <Bram@vim.org> |
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date | Fri, 26 Mar 2021 13:45:02 +0100 |
parents | 5b7ea82bc18f |
children | 7422f2f719a3 |
rev | line source |
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22723 | 1 *textprop.txt* For Vim version 8.2. Last change: 2020 Oct 14 |
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4 VIM REFERENCE MANUAL by Bram Moolenaar |
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5 |
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6 |
16610 | 7 Displaying text with properties attached. *textprop* *text-properties* |
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8 |
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9 |
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10 1. Introduction |text-prop-intro| |
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11 2. Functions |text-prop-functions| |
15512 | 12 3. When text changes |text-prop-changes| |
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13 |
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14 |
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15 {not able to use text properties when the |+textprop| feature was |
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16 disabled at compile time} |
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17 |
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18 ============================================================================== |
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19 1. Introduction *text-prop-intro* |
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20 |
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21 Text properties can be attached to text in a buffer. They will move with the |
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22 text: If lines are deleted or inserted the properties move with the text they |
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23 are attached to. Also when inserting/deleting text in the line before the |
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24 text property. And when inserting/deleting text inside the text property, it |
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25 will increase/decrease in size. |
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26 |
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27 The main use for text properties is to highlight text. This can be seen as a |
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28 replacement for syntax highlighting. Instead of defining patterns to match |
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29 the text, the highlighting is set by a script, possibly using the output of an |
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30 external parser. This only needs to be done once, not every time when |
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31 redrawing the screen, thus can be much faster, after the initial cost of |
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32 attaching the text properties. |
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33 |
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34 Text properties can also be used for other purposes to identify text. For |
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35 example, add a text property on a function name, so that a search can be |
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36 defined to jump to the next/previous function. |
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37 |
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38 A text property is attached at a specific line and column, and has a specified |
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39 length. The property can span multiple lines. |
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40 |
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41 A text property has these fields: |
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42 "id" a number to be used as desired |
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43 "type" the name of a property type |
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44 |
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45 |
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46 Property Types ~ |
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47 *E971* |
18831 | 48 A text property normally has the name of a property type, which defines |
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49 how to highlight the text. The property type can have these entries: |
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50 "highlight" name of the highlight group to use |
18615 | 51 "combine" when omitted or TRUE the text property highlighting is |
52 combined with any syntax highlighting; when FALSE the | |
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53 text property highlighting replaces the syntax |
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54 highlighting |
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55 "priority" when properties overlap, the one with the highest |
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56 priority will be used. |
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57 "start_incl" when TRUE inserts at the start position will be |
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58 included in the text property |
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59 "end_incl" when TRUE inserts at the end position will be |
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60 included in the text property |
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61 |
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62 |
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63 Example ~ |
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64 |
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65 Suppose line 11 in a buffer has this text (excluding the indent): |
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66 |
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67 The number 123 is smaller than 4567. |
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68 |
15334 | 69 To highlight the numbers in this text: > |
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70 call prop_type_add('number', {'highlight': 'Constant'}) |
15194 | 71 call prop_add(11, 12, {'length': 3, 'type': 'number'}) |
72 call prop_add(11, 32, {'length': 4, 'type': 'number'}) | |
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73 |
15334 | 74 Try inserting or deleting lines above the text, you will see that the text |
75 properties stick to the text, thus the line number is adjusted as needed. | |
76 | |
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77 Setting "start_incl" and "end_incl" is useful when white space surrounds the |
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78 text, e.g. for a function name. Using false is useful when the text starts |
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79 and/or ends with a specific character, such as the quote surrounding a string. |
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80 |
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81 func FuncName(arg) ~ |
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82 ^^^^^^^^ property with start_incl and end_incl set |
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83 |
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84 var = "text"; ~ |
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85 ^^^^^^ property with start_incl and end_incl not set |
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86 |
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87 Nevertheless, when text is inserted or deleted the text may need to be parsed |
15194 | 88 and the text properties updated. But this can be done asynchronously. |
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89 |
18456 | 90 |
91 Internal error *E967* | |
92 | |
93 If you see E967, please report the bug. You can do this at Github: | |
94 https://github.com/vim/vim/issues/new | |
95 | |
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96 ============================================================================== |
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97 2. Functions *text-prop-functions* |
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98 |
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99 Manipulating text property types: |
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100 |
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101 prop_type_add({name}, {props}) define a new property type |
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102 prop_type_change({name}, {props}) change an existing property type |
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103 prop_type_delete({name} [, {props}]) delete a property type |
22723 | 104 prop_type_get({name} [, {props}]) get property type values |
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105 prop_type_list([{props}]) get list of property types |
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106 |
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107 |
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108 Manipulating text properties: |
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109 |
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110 prop_add({lnum}, {col}, {props}) add a text property |
15281 | 111 prop_clear({lnum} [, {lnum-end} [, {bufnr}]]) |
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112 remove all text properties |
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113 prop_find({props} [, {direction}]) search for a text property |
20241 | 114 prop_list({lnum} [, {props}]) text properties in {lnum} |
15281 | 115 prop_remove({props} [, {lnum} [, {lnum-end}]]) |
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116 remove a text property |
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117 |
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118 *prop_add()* *E965* |
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119 prop_add({lnum}, {col}, {props}) |
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120 Attach a text property at position {lnum}, {col}. {col} is |
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121 counted in bytes, use one for the first column. |
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122 If {lnum} is invalid an error is given. *E966* |
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123 If {col} is invalid an error is given. *E964* |
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124 |
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125 {props} is a dictionary with these fields: |
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126 length length of text in bytes, can only be used |
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127 for a property that does not continue in |
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128 another line; can be zero |
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129 end_lnum line number for the end of text |
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130 end_col column just after the text; not used when |
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131 "length" is present; when {col} and "end_col" |
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132 are equal, and "end_lnum" is omitted or equal |
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133 to {lnum}, this is a zero-width text property |
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134 bufnr buffer to add the property to; when omitted |
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135 the current buffer is used |
19646 | 136 id user defined ID for the property; must be a |
137 number; when omitted zero is used | |
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138 type name of the text property type |
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139 All fields except "type" are optional. |
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140 |
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141 It is an error when both "length" and "end_lnum" or "end_col" |
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142 are given. Either use "length" or "end_col" for a property |
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143 within one line, or use "end_lnum" and "end_col" for a |
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144 property that spans more than one line. |
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145 When neither "length" nor "end_col" are given the property |
19523 | 146 will be zero-width. That means it will move with the text, as |
147 a kind of mark. One character will be highlighted, if the | |
148 type specifies highlighting. | |
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149 The property can end exactly at the last character of the |
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150 text, or just after it. In the last case, if text is appended |
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151 to the line, the text property size will increase, also when |
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152 the property type does not have "end_incl" set. |
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153 |
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154 "type" will first be looked up in the buffer the property is |
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155 added to. When not found, the global property types are used. |
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156 If not found an error is given. |
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157 |
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158 Can also be used as a |method|: > |
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159 GetLnum()->prop_add(col, props) |
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160 |
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161 |
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162 prop_clear({lnum} [, {lnum-end} [, {props}]]) *prop_clear()* |
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163 Remove all text properties from line {lnum}. |
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164 When {lnum-end} is given, remove all text properties from line |
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165 {lnum} to {lnum-end} (inclusive). |
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166 |
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167 When {props} contains a "bufnr" item use this buffer, |
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168 otherwise use the current buffer. |
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169 |
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170 Can also be used as a |method|: > |
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171 GetLnum()->prop_clear() |
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172 < |
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173 *prop_find()* |
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174 prop_find({props} [, {direction}]) |
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175 Search for a text property as specified with {props}: |
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176 id property with this ID |
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177 type property with this type name |
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178 bufnr buffer to search in; when present a |
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179 start position with "lnum" and "col" |
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180 must be given; when omitted the |
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181 current buffer is used |
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182 lnum start in this line (when omitted start |
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183 at the cursor) |
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184 col start at this column (when omitted |
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185 and "lnum" is given: use column 1, |
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186 otherwise start at the cursor) |
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187 skipstart do not look for a match at the start |
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188 position |
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189 |
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190 {direction} can be "f" for forward and "b" for backward. When |
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191 omitted forward search is performed. |
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192 |
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193 If a match is found then a Dict is returned with the entries |
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194 as with prop_list(), and additionally an "lnum" entry. |
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195 If no match is found then an empty Dict is returned. |
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196 |
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197 |
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198 prop_list({lnum} [, {props}]) *prop_list()* |
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199 Return a List with all text properties in line {lnum}. |
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200 |
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201 When {props} contains a "bufnr" item, use this buffer instead |
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202 of the current buffer. |
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203 |
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204 The properties are ordered by starting column and priority. |
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205 Each property is a Dict with these entries: |
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206 col starting column |
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207 length length in bytes, one more if line break is |
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208 included |
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209 id property ID |
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210 type name of the property type, omitted if |
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211 the type was deleted |
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212 start when TRUE property starts in this line |
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213 end when TRUE property ends in this line |
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214 |
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215 When "start" is zero the property started in a previous line, |
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216 the current one is a continuation. |
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217 When "end" is zero the property continues in the next line. |
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218 The line break after this line is included. |
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219 |
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220 Can also be used as a |method|: > |
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221 GetLnum()->prop_list() |
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222 < |
21250 | 223 *prop_remove()* *E968* *E860* |
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224 prop_remove({props} [, {lnum} [, {lnum-end}]]) |
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225 Remove a matching text property from line {lnum}. When |
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226 {lnum-end} is given, remove matching text properties from line |
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227 {lnum} to {lnum-end} (inclusive). |
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228 When {lnum} is omitted remove matching text properties from |
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229 all lines. |
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230 |
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231 {props} is a dictionary with these fields: |
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232 id remove text properties with this ID |
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233 type remove text properties with this type name |
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234 both "id" and "type" must both match |
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235 bufnr use this buffer instead of the current one |
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236 all when TRUE remove all matching text properties, |
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237 not just the first one |
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238 A property matches when either "id" or "type" matches. |
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239 If buffer "bufnr" does not exist you get an error message. |
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240 If buffer "bufnr" is not loaded then nothing happens. |
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241 |
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242 Returns the number of properties that were removed. |
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243 |
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244 Can also be used as a |method|: > |
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245 GetProps()->prop_remove() |
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246 |
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247 |
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248 prop_type_add({name}, {props}) *prop_type_add()* *E969* *E970* |
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249 Add a text property type {name}. If a property type with this |
17909 | 250 name already exists an error is given. Nothing is returned. |
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251 {props} is a dictionary with these optional fields: |
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252 bufnr define the property only for this buffer; this |
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253 avoids name collisions and automatically |
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254 clears the property types when the buffer is |
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255 deleted. |
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256 highlight name of highlight group to use |
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257 priority when a character has multiple text |
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258 properties the one with the highest priority |
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259 will be used; negative values can be used, the |
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260 default priority is zero |
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261 combine when TRUE combine the highlight with any |
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262 syntax highlight; when omitted or FALSE syntax |
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263 highlight will not be used |
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264 start_incl when TRUE inserts at the start position will |
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265 be included in the text property |
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266 end_incl when TRUE inserts at the end position will be |
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267 included in the text property |
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268 |
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269 Can also be used as a |method|: > |
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270 GetPropName()->prop_type_add(props) |
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271 |
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272 prop_type_change({name}, {props}) *prop_type_change()* |
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273 Change properties of an existing text property type. If a |
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274 property with this name does not exist an error is given. |
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275 The {props} argument is just like |prop_type_add()|. |
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276 |
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277 Can also be used as a |method|: > |
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278 GetPropName()->prop_type_change(props) |
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279 |
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280 prop_type_delete({name} [, {props}]) *prop_type_delete()* |
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281 Remove the text property type {name}. When text properties |
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282 using the type {name} are still in place, they will not have |
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283 an effect and can no longer be removed by name. |
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284 |
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285 {props} can contain a "bufnr" item. When it is given, delete |
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286 a property type from this buffer instead of from the global |
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287 property types. |
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288 |
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289 When text property type {name} is not found there is no error. |
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290 |
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291 Can also be used as a |method|: > |
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292 GetPropName()->prop_type_delete() |
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293 |
22723 | 294 prop_type_get({name} [, {props}]) *prop_type_get()* |
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295 Returns the properties of property type {name}. This is a |
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296 dictionary with the same fields as was given to |
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297 prop_type_add(). |
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298 When the property type {name} does not exist, an empty |
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299 dictionary is returned. |
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300 |
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301 {props} can contain a "bufnr" item. When it is given, use |
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302 this buffer instead of the global property types. |
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303 |
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304 Can also be used as a |method|: > |
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305 GetPropName()->prop_type_get() |
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306 |
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307 prop_type_list([{props}]) *prop_type_list()* |
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308 Returns a list with all property type names. |
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309 |
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310 {props} can contain a "bufnr" item. When it is given, use |
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311 this buffer instead of the global property types. |
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312 |
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313 |
15512 | 314 ============================================================================== |
315 3. When text changes *text-prop-changes* | |
316 | |
317 Vim will do its best to keep the text properties on the text where it was | |
318 attached. When inserting or deleting text the properties after the change | |
319 will move accordingly. | |
320 | |
321 When text is deleted and a text property no longer includes any text, it is | |
322 deleted. However, a text property that was defined as zero-width will remain, | |
323 unless the whole line is deleted. | |
18016 | 324 *E275* |
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325 When a buffer is unloaded, all the text properties are gone. There is no way |
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326 to store the properties in a file. You can only re-create them. When a |
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327 buffer is hidden the text is preserved and so are the text properties. It is |
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328 not possible to add text properties to an unloaded buffer. |
15512 | 329 |
330 When using replace mode, the text properties stay on the same character | |
331 positions, even though the characters themselves change. | |
332 | |
16808 | 333 To update text properties after the text was changed, install a callback with |
334 `listener_add()`. E.g, if your plugin does spell checking, you can have the | |
335 callback update spelling mistakes in the changed text. Vim will move the | |
336 properties below the changed text, so that they still highlight the same text, | |
337 thus you don't need to update these. | |
338 | |
15512 | 339 |
19523 | 340 Text property columns are not updated or copied: ~ |
15512 | 341 |
342 - When setting the line with |setline()| or through an interface, such as Lua, | |
16610 | 343 Tcl or Python. Vim does not know what text got inserted or deleted. |
19523 | 344 - With a command like `:move`, which takes a line of text out of context. |
15512 | 345 |
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346 |
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347 vim:tw=78:ts=8:noet:ft=help:norl: |