Mercurial > vim
annotate src/vim9class.c @ 31416:f088f1d97eee v9.0.1041
patch 9.0.1041: cannot define a method in a class
Commit: https://github.com/vim/vim/commit/ffdaca9e6f3d39af6857ac52ced9385df203a152
Author: Bram Moolenaar <Bram@vim.org>
Date: Fri Dec 9 21:41:48 2022 +0000
patch 9.0.1041: cannot define a method in a class
Problem: Cannot define a method in a class.
Solution: Implement defining an object method. Make calling an object
method work.
author | Bram Moolenaar <Bram@vim.org> |
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date | Fri, 09 Dec 2022 22:45:03 +0100 |
parents | c82cb53474ee |
children | 462508d04341 |
rev | line source |
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1 /* vi:set ts=8 sts=4 sw=4 noet: |
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2 * |
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3 * VIM - Vi IMproved by Bram Moolenaar |
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4 * |
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5 * Do ":help uganda" in Vim to read copying and usage conditions. |
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6 * Do ":help credits" in Vim to see a list of people who contributed. |
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7 * See README.txt for an overview of the Vim source code. |
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8 */ |
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9 |
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10 /* |
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11 * vim9class.c: Vim9 script class support |
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12 */ |
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13 |
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14 #define USING_FLOAT_STUFF |
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15 #include "vim.h" |
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16 |
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17 #if defined(FEAT_EVAL) || defined(PROTO) |
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18 |
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19 // When not generating protos this is included in proto.h |
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20 #ifdef PROTO |
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21 # include "vim9.h" |
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22 #endif |
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23 |
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24 /* |
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25 * Handle ":class" and ":abstract class" up to ":endclass". |
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26 */ |
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27 void |
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28 ex_class(exarg_T *eap) |
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29 { |
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30 if (!current_script_is_vim9() |
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31 || (cmdmod.cmod_flags & CMOD_LEGACY) |
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32 || !getline_equal(eap->getline, eap->cookie, getsourceline)) |
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33 { |
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34 emsg(_(e_class_can_only_be_defined_in_vim9_script)); |
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35 return; |
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36 } |
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37 |
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38 char_u *arg = eap->arg; |
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39 int is_abstract = eap->cmdidx == CMD_abstract; |
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40 if (is_abstract) |
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41 { |
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42 if (STRNCMP(arg, "class", 5) != 0 || !VIM_ISWHITE(arg[5])) |
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43 { |
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44 semsg(_(e_invalid_argument_str), arg); |
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45 return; |
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46 } |
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47 arg = skipwhite(arg + 5); |
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48 } |
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49 |
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50 if (!ASCII_ISUPPER(*arg)) |
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51 { |
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52 semsg(_(e_class_name_must_start_with_uppercase_letter_str), arg); |
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53 return; |
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54 } |
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55 char_u *name_end = find_name_end(arg, NULL, NULL, FNE_CHECK_START); |
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56 if (!IS_WHITE_OR_NUL(*name_end)) |
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57 { |
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58 semsg(_(e_white_space_required_after_class_name_str), arg); |
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59 return; |
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60 } |
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61 |
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62 // TODO: |
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63 // generics: <Tkey, Tentry> |
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64 // extends SomeClass |
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65 // implements SomeInterface |
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66 // specifies SomeInterface |
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67 // check nothing follows |
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68 |
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69 // TODO: handle "is_export" if it is set |
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70 |
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71 garray_T type_list; // list of pointers to allocated types |
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72 ga_init2(&type_list, sizeof(type_T *), 10); |
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73 |
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74 // Growarray with object members declared in the class. |
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75 garray_T objmembers; |
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76 ga_init2(&objmembers, sizeof(objmember_T), 10); |
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77 |
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78 // Growarray with object methods declared in the class. |
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79 garray_T objmethods; |
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80 ga_init2(&objmethods, sizeof(ufunc_T *), 10); |
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81 |
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82 /* |
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83 * Go over the body of the class until "endclass" is found. |
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84 */ |
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85 char_u *theline = NULL; |
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86 int success = FALSE; |
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87 for (;;) |
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88 { |
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89 vim_free(theline); |
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90 theline = eap->getline(':', eap->cookie, 0, GETLINE_CONCAT_ALL); |
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91 if (theline == NULL) |
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92 break; |
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93 char_u *line = skipwhite(theline); |
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94 |
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95 // TODO: |
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96 // class members (public, read access, private): |
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97 // static varname |
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98 // public static varname |
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99 // static _varname |
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100 |
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101 char_u *p = line; |
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102 if (checkforcmd(&p, "endclass", 4)) |
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103 { |
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104 if (STRNCMP(line, "endclass", 8) != 0) |
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105 semsg(_(e_command_cannot_be_shortened_str), line); |
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106 else if (*p == '|' || !ends_excmd2(line, p)) |
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107 semsg(_(e_trailing_characters_str), p); |
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108 else |
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109 success = TRUE; |
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110 break; |
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111 } |
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112 |
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113 // "this.varname" |
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114 // "this._varname" |
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115 // TODO: |
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116 // "public this.varname" |
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117 if (STRNCMP(line, "this", 4) == 0) |
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118 { |
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119 if (line[4] != '.' || !eval_isnamec1(line[5])) |
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120 { |
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121 semsg(_(e_invalid_object_member_declaration_str), line); |
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122 break; |
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123 } |
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124 char_u *varname = line + 5; |
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125 char_u *varname_end = to_name_end(varname, FALSE); |
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126 |
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127 char_u *colon = skipwhite(varname_end); |
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128 // TODO: accept initialization and figure out type from it |
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129 if (*colon != ':') |
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130 { |
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131 emsg(_(e_type_or_initialization_required)); |
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132 break; |
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133 } |
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134 if (VIM_ISWHITE(*varname_end)) |
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135 { |
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136 semsg(_(e_no_white_space_allowed_before_colon_str), varname); |
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137 break; |
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138 } |
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139 if (!VIM_ISWHITE(colon[1])) |
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140 { |
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141 semsg(_(e_white_space_required_after_str_str), ":", varname); |
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142 break; |
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143 } |
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144 |
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145 char_u *type_arg = skipwhite(colon + 1); |
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146 type_T *type = parse_type(&type_arg, &type_list, TRUE); |
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147 if (type == NULL) |
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148 break; |
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149 |
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150 if (ga_grow(&objmembers, 1) == FAIL) |
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151 break; |
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152 objmember_T *m = ((objmember_T *)objmembers.ga_data) |
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153 + objmembers.ga_len; |
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154 m->om_name = vim_strnsave(varname, varname_end - varname); |
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155 m->om_type = type; |
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156 ++objmembers.ga_len; |
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157 } |
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158 |
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159 // constructors: |
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160 // def new() |
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161 // enddef |
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162 // def newOther() |
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163 // enddef |
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164 // methods: |
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165 // def someMethod() |
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166 // enddef |
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167 // TODO: |
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168 // static def someMethod() |
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169 // enddef |
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170 // def <Tval> someMethod() |
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171 // enddef |
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172 // static def <Tval> someMethod() |
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173 // enddef |
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174 else if (checkforcmd(&p, "def", 3)) |
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175 { |
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176 exarg_T ea; |
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177 garray_T lines_to_free; |
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178 |
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179 CLEAR_FIELD(ea); |
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180 ea.cmd = line; |
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181 ea.arg = p; |
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182 ea.cmdidx = CMD_def; |
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183 ea.getline = eap->getline; |
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184 ea.cookie = eap->cookie; |
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185 |
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186 ga_init2(&lines_to_free, sizeof(char_u *), 50); |
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187 ufunc_T *uf = define_function(&ea, NULL, &lines_to_free, TRUE); |
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188 ga_clear_strings(&lines_to_free); |
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189 |
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190 // TODO: how about errors? |
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191 if (uf != NULL && ga_grow(&objmethods, 1) == OK) |
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192 { |
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193 ((ufunc_T **)objmethods.ga_data)[objmethods.ga_len] = uf; |
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194 ++objmethods.ga_len; |
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195 } |
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196 } |
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197 |
31396
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198 else |
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199 { |
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200 semsg(_(e_not_valid_command_in_class_str), line); |
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201 break; |
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202 } |
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203 } |
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204 vim_free(theline); |
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205 |
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206 if (success) |
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207 { |
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208 class_T *cl = ALLOC_CLEAR_ONE(class_T); |
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209 if (cl == NULL) |
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210 goto cleanup; |
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211 cl->class_refcount = 1; |
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212 cl->class_name = vim_strnsave(arg, name_end - arg); |
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213 |
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214 // Members are used by the new() function, add them here. |
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215 cl->class_obj_member_count = objmembers.ga_len; |
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216 cl->class_obj_members = objmembers.ga_len == 0 ? NULL |
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217 : ALLOC_MULT(objmember_T, objmembers.ga_len); |
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218 if (cl->class_name == NULL |
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219 || (objmembers.ga_len > 0 && cl->class_obj_members == NULL)) |
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220 { |
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221 vim_free(cl->class_name); |
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222 vim_free(cl->class_obj_members); |
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223 vim_free(cl); |
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224 goto cleanup; |
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225 } |
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226 mch_memmove(cl->class_obj_members, objmembers.ga_data, |
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227 sizeof(objmember_T) * objmembers.ga_len); |
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228 vim_free(objmembers.ga_data); |
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229 |
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230 int have_new = FALSE; |
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231 for (int i = 0; i < objmethods.ga_len; ++i) |
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232 if (STRCMP(((ufunc_T **)objmethods.ga_data)[i]->uf_name, |
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233 "new") == 0) |
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234 { |
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235 have_new = TRUE; |
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236 break; |
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237 } |
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238 if (!have_new) |
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239 { |
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240 // No new() method was defined, add the default constructor. |
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241 garray_T fga; |
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242 ga_init2(&fga, 1, 1000); |
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243 ga_concat(&fga, (char_u *)"new("); |
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244 for (int i = 0; i < cl->class_obj_member_count; ++i) |
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245 { |
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246 if (i > 0) |
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247 ga_concat(&fga, (char_u *)", "); |
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248 ga_concat(&fga, (char_u *)"this."); |
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249 objmember_T *m = cl->class_obj_members + i; |
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250 ga_concat(&fga, (char_u *)m->om_name); |
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251 } |
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252 ga_concat(&fga, (char_u *)")\nenddef\n"); |
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253 ga_append(&fga, NUL); |
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254 |
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255 exarg_T fea; |
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256 CLEAR_FIELD(fea); |
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257 fea.cmdidx = CMD_def; |
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258 fea.cmd = fea.arg = fga.ga_data; |
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259 |
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260 garray_T lines_to_free; |
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261 ga_init2(&lines_to_free, sizeof(char_u *), 50); |
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262 |
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263 ufunc_T *nf = define_function(&fea, NULL, &lines_to_free, TRUE); |
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264 |
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265 ga_clear_strings(&lines_to_free); |
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266 vim_free(fga.ga_data); |
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267 |
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268 if (nf != NULL && ga_grow(&objmethods, 1) == OK) |
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269 { |
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270 ((ufunc_T **)objmethods.ga_data)[objmethods.ga_len] = nf; |
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271 ++objmethods.ga_len; |
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272 |
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273 nf->uf_flags |= FC_NEW; |
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274 nf->uf_ret_type = get_type_ptr(&type_list); |
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275 if (nf->uf_ret_type != NULL) |
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276 { |
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277 nf->uf_ret_type->tt_type = VAR_OBJECT; |
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278 nf->uf_ret_type->tt_member = (type_T *)cl; |
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279 nf->uf_ret_type->tt_argcount = 0; |
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280 nf->uf_ret_type->tt_args = NULL; |
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281 } |
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282 } |
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283 } |
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284 |
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285 cl->class_obj_method_count = objmethods.ga_len; |
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286 cl->class_obj_methods = ALLOC_MULT(ufunc_T *, objmethods.ga_len); |
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287 if (cl->class_obj_methods == NULL) |
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288 { |
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289 vim_free(cl->class_name); |
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290 vim_free(cl->class_obj_members); |
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291 vim_free(cl->class_obj_methods); |
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292 vim_free(cl); |
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293 goto cleanup; |
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294 } |
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295 mch_memmove(cl->class_obj_methods, objmethods.ga_data, |
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296 sizeof(ufunc_T *) * objmethods.ga_len); |
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297 vim_free(objmethods.ga_data); |
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298 |
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299 // Set the class pointer on all the object methods. |
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300 for (int i = 0; i < objmethods.ga_len; ++i) |
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301 { |
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302 ufunc_T *fp = cl->class_obj_methods[i]; |
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303 fp->uf_class = cl; |
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304 fp->uf_flags |= FC_OBJECT; // TODO: not for class method |
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305 } |
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306 |
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307 cl->class_type.tt_type = VAR_CLASS; |
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308 cl->class_type.tt_member = (type_T *)cl; |
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309 cl->class_object_type.tt_type = VAR_OBJECT; |
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310 cl->class_object_type.tt_member = (type_T *)cl; |
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311 cl->class_type_list = type_list; |
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312 |
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313 // TODO: |
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314 // - Add the methods to the class |
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315 // - array with ufunc_T pointers |
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316 // - Fill hashtab with object members and methods |
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317 // - Generate the default new() method, if needed. |
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318 // Later: |
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319 // - class members |
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320 // - class methods |
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321 |
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322 // Add the class to the script-local variables. |
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323 typval_T tv; |
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324 tv.v_type = VAR_CLASS; |
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325 tv.vval.v_class = cl; |
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326 set_var_const(cl->class_name, current_sctx.sc_sid, |
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327 NULL, &tv, FALSE, ASSIGN_DECL, 0); |
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328 return; |
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329 } |
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330 |
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|
331 cleanup: |
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|
332 for (int i = 0; i < objmembers.ga_len; ++i) |
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333 { |
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334 objmember_T *m = ((objmember_T *)objmembers.ga_data) + i; |
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335 vim_free(m->om_name); |
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336 } |
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337 ga_clear(&objmembers); |
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338 |
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339 for (int i = 0; i < objmethods.ga_len; ++i) |
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340 { |
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341 ufunc_T *uf = ((ufunc_T **)objmethods.ga_data)[i]; |
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342 func_clear_free(uf, FALSE); |
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343 } |
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344 ga_clear(&objmethods); |
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345 clear_type_list(&type_list); |
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346 } |
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347 |
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348 /* |
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349 * Find member "name" in class "cl" and return its type. |
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350 * When not found t_any is returned. |
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351 */ |
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352 type_T * |
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353 class_member_type( |
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354 class_T *cl, |
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355 char_u *name, |
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356 char_u *name_end, |
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357 int *member_idx) |
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358 { |
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359 *member_idx = -1; // not found (yet) |
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360 size_t len = name_end - name; |
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361 |
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362 for (int i = 0; i < cl->class_obj_member_count; ++i) |
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363 { |
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364 objmember_T *m = cl->class_obj_members + i; |
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365 if (STRNCMP(m->om_name, name, len) == 0 && m->om_name[len] == NUL) |
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366 { |
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367 *member_idx = i; |
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368 return m->om_type; |
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369 } |
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370 } |
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371 return &t_any; |
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372 } |
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373 |
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374 /* |
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375 * Handle ":interface" up to ":endinterface". |
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376 */ |
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377 void |
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378 ex_interface(exarg_T *eap UNUSED) |
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379 { |
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380 // TODO |
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381 } |
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382 |
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383 /* |
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384 * Handle ":enum" up to ":endenum". |
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385 */ |
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386 void |
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387 ex_enum(exarg_T *eap UNUSED) |
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388 { |
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389 // TODO |
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390 } |
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391 |
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392 /* |
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393 * Handle ":type". |
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394 */ |
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395 void |
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396 ex_type(exarg_T *eap UNUSED) |
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397 { |
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398 // TODO |
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399 } |
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400 |
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401 /* |
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402 * Evaluate what comes after a class: |
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403 * - class member: SomeClass.varname |
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404 * - class method: SomeClass.SomeMethod() |
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405 * - class constructor: SomeClass.new() |
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406 * - object member: someObject.varname |
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407 * - object method: someObject.SomeMethod() |
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408 * |
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409 * "*arg" points to the '.'. |
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410 * "*arg" is advanced to after the member name or method call. |
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411 * |
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412 * Returns FAIL or OK. |
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413 */ |
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414 int |
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415 class_object_index( |
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416 char_u **arg, |
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417 typval_T *rettv, |
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418 evalarg_T *evalarg, |
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419 int verbose UNUSED) // give error messages |
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420 { |
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421 // int evaluate = evalarg != NULL |
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422 // && (evalarg->eval_flags & EVAL_EVALUATE); |
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423 |
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424 if (VIM_ISWHITE((*arg)[1])) |
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425 { |
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426 semsg(_(e_no_white_space_allowed_after_str_str), ".", *arg); |
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427 return FAIL; |
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428 } |
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429 |
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430 ++*arg; |
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431 char_u *name = *arg; |
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432 char_u *name_end = find_name_end(name, NULL, NULL, FNE_CHECK_START); |
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433 if (name_end == name) |
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434 return FAIL; |
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435 size_t len = name_end - name; |
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436 |
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437 class_T *cl = rettv->v_type == VAR_CLASS ? rettv->vval.v_class |
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438 : rettv->vval.v_object->obj_class; |
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439 if (*name_end == '(') |
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440 { |
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441 for (int i = 0; i < cl->class_obj_method_count; ++i) |
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442 { |
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443 ufunc_T *fp = cl->class_obj_methods[i]; |
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444 if (STRNCMP(name, fp->uf_name, len) == 0 && fp->uf_name[len] == NUL) |
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445 { |
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446 typval_T argvars[MAX_FUNC_ARGS + 1]; |
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447 int argcount = 0; |
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448 |
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449 char_u *argp = name_end; |
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450 int ret = get_func_arguments(&argp, evalarg, 0, |
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451 argvars, &argcount); |
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452 if (ret == FAIL) |
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453 return FAIL; |
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454 |
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455 funcexe_T funcexe; |
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456 CLEAR_FIELD(funcexe); |
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457 funcexe.fe_evaluate = TRUE; |
31416
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458 if (rettv->v_type == VAR_OBJECT) |
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459 { |
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460 funcexe.fe_object = rettv->vval.v_object; |
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461 ++funcexe.fe_object->obj_refcount; |
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462 } |
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463 |
31404
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464 // Clear the class or object after calling the function, in |
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465 // case the refcount is one. |
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466 typval_T tv_tofree = *rettv; |
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467 rettv->v_type = VAR_UNKNOWN; |
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468 |
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469 // Call the user function. Result goes into rettv; |
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470 int error = call_user_func_check(fp, argcount, argvars, |
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471 rettv, &funcexe, NULL); |
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472 |
31404
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473 // Clear the previous rettv and the arguments. |
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474 clear_tv(&tv_tofree); |
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475 for (int idx = 0; idx < argcount; ++idx) |
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476 clear_tv(&argvars[idx]); |
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477 |
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478 if (error != FCERR_NONE) |
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479 { |
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480 user_func_error(error, printable_func_name(fp), |
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481 funcexe.fe_found_var); |
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482 return FAIL; |
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483 } |
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484 *arg = argp; |
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485 return OK; |
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486 } |
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487 } |
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488 |
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489 semsg(_(e_method_not_found_on_class_str_str), cl->class_name, name); |
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490 } |
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491 |
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492 else if (rettv->v_type == VAR_OBJECT) |
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493 { |
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494 for (int i = 0; i < cl->class_obj_member_count; ++i) |
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495 { |
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496 objmember_T *m = &cl->class_obj_members[i]; |
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497 if (STRNCMP(name, m->om_name, len) == 0 && m->om_name[len] == NUL) |
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498 { |
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499 // The object only contains a pointer to the class, the member |
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500 // values array follows right after that. |
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501 object_T *obj = rettv->vval.v_object; |
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502 typval_T *tv = (typval_T *)(obj + 1) + i; |
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503 copy_tv(tv, rettv); |
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504 object_unref(obj); |
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|
505 |
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506 *arg = name_end; |
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507 return OK; |
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|
508 } |
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changeset
|
509 } |
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changeset
|
510 |
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511 semsg(_(e_member_not_found_on_object_str_str), cl->class_name, name); |
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|
512 } |
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|
513 |
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|
514 // TODO: class member |
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|
515 |
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|
516 return FAIL; |
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changeset
|
517 } |
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|
518 |
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|
519 /* |
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520 * Make a copy of an object. |
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521 */ |
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522 void |
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523 copy_object(typval_T *from, typval_T *to) |
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changeset
|
524 { |
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|
525 *to = *from; |
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|
526 if (to->vval.v_object != NULL) |
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527 ++to->vval.v_object->obj_refcount; |
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|
528 } |
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|
529 |
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|
530 /* |
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|
531 * Free an object. |
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|
532 */ |
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|
533 static void |
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|
534 object_clear(object_T *obj) |
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|
535 { |
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|
536 class_T *cl = obj->obj_class; |
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changeset
|
537 |
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changeset
|
538 // the member values are just after the object structure |
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|
539 typval_T *tv = (typval_T *)(obj + 1); |
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|
540 for (int i = 0; i < cl->class_obj_member_count; ++i) |
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|
541 clear_tv(tv + i); |
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changeset
|
542 |
31404
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|
543 // Remove from the list headed by "first_object". |
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|
544 object_cleared(obj); |
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|
545 |
31396
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|
546 vim_free(obj); |
31404
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|
547 class_unref(cl); |
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|
548 } |
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|
549 |
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|
550 /* |
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551 * Unreference an object. |
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|
552 */ |
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|
553 void |
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|
554 object_unref(object_T *obj) |
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|
555 { |
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changeset
|
556 if (obj != NULL && --obj->obj_refcount <= 0) |
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changeset
|
557 object_clear(obj); |
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changeset
|
558 } |
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changeset
|
559 |
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patch 9.0.1031: Vim9 class is not implemented yet
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|
560 /* |
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561 * Make a copy of a class. |
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562 */ |
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563 void |
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564 copy_class(typval_T *from, typval_T *to) |
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565 { |
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566 *to = *from; |
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567 if (to->vval.v_class != NULL) |
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568 ++to->vval.v_class->class_refcount; |
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569 } |
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570 |
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571 /* |
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572 * Unreference a class. Free it when the reference count goes down to zero. |
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573 */ |
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574 void |
31404
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575 class_unref(class_T *cl) |
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576 { |
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577 if (cl != NULL && --cl->class_refcount <= 0) |
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578 { |
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579 vim_free(cl->class_name); |
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580 |
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581 for (int i = 0; i < cl->class_obj_member_count; ++i) |
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582 { |
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583 objmember_T *m = &cl->class_obj_members[i]; |
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584 vim_free(m->om_name); |
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585 } |
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586 vim_free(cl->class_obj_members); |
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587 |
31416
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588 for (int i = 0; i < cl->class_obj_method_count; ++i) |
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589 { |
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590 ufunc_T *uf = cl->class_obj_methods[i]; |
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591 func_clear_free(uf, FALSE); |
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592 } |
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593 vim_free(cl->class_obj_methods); |
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594 |
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595 clear_type_list(&cl->class_type_list); |
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596 |
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597 vim_free(cl); |
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598 } |
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599 } |
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600 |
31404
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601 static object_T *first_object = NULL; |
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602 |
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603 /* |
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604 * Call this function when an object has been created. It will be added to the |
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605 * list headed by "first_object". |
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606 */ |
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607 void |
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608 object_created(object_T *obj) |
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609 { |
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610 if (first_object != NULL) |
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611 { |
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612 obj->obj_next_used = first_object; |
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613 first_object->obj_prev_used = obj; |
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614 } |
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615 first_object = obj; |
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616 } |
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617 |
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618 /* |
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619 * Call this function when an object has been cleared and is about to be freed. |
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620 * It is removed from the list headed by "first_object". |
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621 */ |
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622 void |
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623 object_cleared(object_T *obj) |
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624 { |
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625 if (obj->obj_next_used != NULL) |
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626 obj->obj_next_used->obj_prev_used = obj->obj_prev_used; |
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627 if (obj->obj_prev_used != NULL) |
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628 obj->obj_prev_used->obj_next_used = obj->obj_next_used; |
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629 else if (first_object == obj) |
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630 first_object = obj->obj_next_used; |
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631 } |
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632 |
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633 /* |
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634 * Go through the list of all objects and free items without "copyID". |
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635 */ |
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636 int |
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637 object_free_nonref(int copyID) |
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638 { |
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639 int did_free = FALSE; |
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640 object_T *next_obj; |
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641 |
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642 for (object_T *obj = first_object; obj != NULL; obj = next_obj) |
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643 { |
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644 next_obj = obj->obj_next_used; |
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645 if ((obj->obj_copyID & COPYID_MASK) != (copyID & COPYID_MASK)) |
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646 { |
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647 // Free the object and items it contains. |
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648 object_clear(obj); |
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649 did_free = TRUE; |
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650 } |
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651 } |
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652 |
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653 return did_free; |
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654 } |
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655 |
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656 |
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657 #endif // FEAT_EVAL |