Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/mujs/docs/examples.html @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 <!DOCTYPE html>
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2 <html>
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3 <head>
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4 <link href="style.css" rel="stylesheet">
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5 <title>MuJS Examples</title>
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6 </head>
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8 <body>
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10 <header>
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11 <h1>MuJS Examples</h1>
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12 </header>
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14 <nav>
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15 <a href="introduction.html">Introduction</a>
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16 <a href="reference.html">Reference</a>
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17 <a href="examples.html">Examples</a>
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18 <a href="license.html">License</a>
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19 <a href="http://git.ghostscript.com/?p=mujs.git;a=summary">Source</a>
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20 <a href="https://bugs.ghostscript.com/">Bugs</a>
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21 </nav>
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23 <article>
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25 <h2>A stand-alone interpreter</h2>
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27 <pre>
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28 #include &lt;stdio.h&gt;
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29 #include &lt;mujs.h&gt;
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31 int main(int argc, char **argv)
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32 {
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33 char line[256];
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34 js_State *J = js_newstate(NULL, NULL, JS_STRICT);
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35 while (fgets(line, sizeof line, stdin))
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36 js_dostring(J, line);
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37 js_freestate(J);
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38 }
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39 </pre>
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41 <h2>Hello, world!</h2>
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43 <pre>
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44 #include &lt;stdio.h&gt;
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45 #include &lt;mujs.h&gt;
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47 static void hello(js_State *J)
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48 {
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49 const char *name = js_tostring(J, 1);
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50 printf("Hello, %s!\n", name);
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51 js_pushundefined(J);
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52 }
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54 int main(int argc, char **argv)
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55 {
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56 js_State *J = js_newstate(NULL, NULL, JS_STRICT);
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58 js_newcfunction(J, hello, "hello", 1);
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59 js_setglobal(J, "hello");
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61 js_dostring(J, "hello('world');");
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63 js_freestate(J);
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64 }
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65 </pre>
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67 <h2>Configuration file</h2>
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69 <pre>
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70 js_dofile(J, "config.js")
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72 js_getglobal(J, "foo");
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73 foo = js_tonumber(J, -1);
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74 js_pop(J, 1);
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75 </pre>
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77 <h2>Object manipulation</h2>
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79 <pre>
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80 // t = { foo: 42, bar: true }
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82 js_newobject(J);
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83 {
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84 js_pushnumber(J, 42);
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85 js_setproperty(J, -2, "foo");
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86 js_pushboolean(J, 1);
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87 js_setproperty(J, -2, "bar");
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88 }
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89 js_setglobal(J, "t");
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90 </pre>
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92 <h2>Callbacks from C to JS (by name)</h2>
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94 <pre>
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95 static int call_callback(js_State *J, const char *arg1, int arg2)
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96 {
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97 int result;
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99 /* Find the function to call. */
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100 js_getglobal(J, "my_callback");
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102 /* Push arguments to function. */
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103 js_pushnull(J); /* the 'this' object to use */
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104 js_pushstring(J, arg1);
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105 js_pushnumber(J, arg2);
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106
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107 /* Call function and check for exceptions. */
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diff changeset
108 if (js_pcall(J, 2)) {
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109 fprintf(stderr, "an exception occurred in the javascript callback\n");
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110 js_pop(J, 1);
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diff changeset
111 return -1;
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112 }
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113
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114 /* Retrieve return value. */
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diff changeset
115 result = js_tonumber(J, -1);
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116 js_pop(J, 1);
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117
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118 return result;
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119 }
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120 </pre>
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121
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122 <h2>Callbacks from C to JS</h2>
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123
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124 <pre>
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125 const char *handle = NULL; /* handle to stowed away js function */
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126
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127 static void set_callback(js_State *J)
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128 {
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129 if (handle)
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130 js_unref(J, handle); /* delete old function */
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131 js_copy(J, 1);
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132 handle = js_ref(J); /* stow the js function in the registry */
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133 }
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134
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135 static void call_callback(js_State *J, int arg1, int arg2)
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136 {
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137 js_getregistry(J, handle); /* retrieve the js function from the registry */
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138 js_pushnull(J);
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parents:
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139 js_pushnumber(J, arg1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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140 js_pushnumber(J, arg2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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141 js_pcall(J, 2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 js_pop(J, 1);
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143 }
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144 </pre>
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145
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146 <h2>Complete userdata example</h2>
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147
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148 <pre>
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149 #include &lt;stdio.h&gt;
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150 #include &lt;mujs.h&gt;
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151
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152 #define TAG "File"
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153
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154 static void new_File(js_State *J)
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155 {
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diff changeset
156 FILE *file;
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157
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parents:
diff changeset
158 if (js_isundefined(J, 1)) {
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159 file = stdin;
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160 } else {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 const char *filename = js_tostring(J, 1);
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parents:
diff changeset
162 file = fopen(filename, "r");
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parents:
diff changeset
163 if (!file)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 js_error(J, "cannot open file: '%s'", filename);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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165 }
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parents:
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166
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 js_currentfunction(J);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 js_getproperty(J, -1, "prototype");
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 js_newuserdata(J, TAG, file);
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170 }
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parents:
diff changeset
171
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parents:
diff changeset
172 static void File_prototype_readByte(js_State *J)
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parents:
diff changeset
173 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 FILE *file = js_touserdata(J, 0, TAG);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 js_pushnumber(J, getc(file));
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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176 }
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diff changeset
177
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parents:
diff changeset
178 static void File_prototype_readLine(js_State *J)
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parents:
diff changeset
179 {
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parents:
diff changeset
180 char line[256], *s;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 FILE *file = js_touserdata(J, 0, TAG);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 s = fgets(line, sizeof line, file);
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parents:
diff changeset
183 if (s)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 js_pushstring(J, line);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 else
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parents:
diff changeset
186 js_pushnull(J);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 }
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parents:
diff changeset
188
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 static void File_prototype_close(js_State *J)
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parents:
diff changeset
190 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 FILE *file = js_touserdata(J, 0, TAG);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 fclose(file);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 js_pushundefined(J);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 }
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parents:
diff changeset
195
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 void initfile(js_State *J)
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parents:
diff changeset
197 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 js_getglobal(J, "Object");
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 js_getproperty(J, -1, "prototype"); // File.prototype.[[Prototype]] = Object.prototype
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 js_newuserdata(J, TAG, stdin); // File.prototype.[[Userdata]] = stdin
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
202 js_newcfunction(J, File_prototype_readByte, "File.prototype.readByte", 0);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203 js_defproperty(J, -2, "readByte", JS_DONTENUM);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
204
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
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205 js_newcfunction(J, File_prototype_readLine, "File.prototype.readLine", 0);
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206 js_defproperty(J, -2, "readLine", JS_DONTENUM);
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207
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208 js_newcfunction(J, File_prototype_close, "File.prototype.close", 0);
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209 js_defproperty(J, -2, "close", JS_DONTENUM);
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210 }
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211 js_newcconstructor(J, new_File, new_File, "File", 1);
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212 js_defglobal(J, "File", JS_DONTENUM);
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213 }
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214 </pre>
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215
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216 </article>
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217
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218 <footer>
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219 <a href="http://artifex.com"><img src="artifex-logo.png" align="right"></a>
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220 Copyright &copy; 2013-2017 Artifex Software Inc.
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221 </footer>
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222
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223 </body>
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224 </html>