Mercurial > pymonkey

annotate context.c @ 24:74b7ad049542

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Added very primitive support for calling python functions from JS.
author Atul Varma <varmaa@toolness.com>
date Mon, 29 Jun 2009 07:28:56 -0700
parents fc04e5f1c675
children 21045074139f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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11
551ba05fe6ad factored out Runtime, Context, and utils into separate files.
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1 #include "context.h"
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2 #include "object.h"
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3 #include "utils.h"
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4
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5 static void
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6 PYM_JSContextDealloc(PYM_JSContextObject *self)
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7 {
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8 if (self->cx) {
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9 JS_DestroyContext(self->cx);
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10 self->cx = NULL;
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11 }
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12
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13 Py_DECREF(self->runtime);
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14 self->runtime = NULL;
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15
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16 self->ob_type->tp_free((PyObject *) self);
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17 }
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18
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19 static PyObject *
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20 PYM_getRuntime(PYM_JSContextObject *self, PyObject *args)
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21 {
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22 Py_INCREF(self->runtime);
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23 return (PyObject *) self->runtime;
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24 }
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25
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26 static PyObject *
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27 PYM_newObject(PYM_JSContextObject *self, PyObject *args)
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28 {
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29 JSObject *obj = JS_NewObject(self->cx, &PYM_JS_ObjectClass, NULL, NULL);
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30 if (obj == NULL) {
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31 PyErr_SetString(PYM_error, "JS_NewObject() failed");
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32 return NULL;
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33 }
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34
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35 // If this fails, we don't need to worry about cleaning up
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36 // obj because it'll get cleaned up at the next GC.
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37 return (PyObject *) PYM_newJSObject(self, obj);
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38 }
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39
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40 static PyObject *
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41 PYM_getProperty(PYM_JSContextObject *self, PyObject *args)
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42 {
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43 // TODO: We're making a lot of copies of the string here, which
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44 // can't be very efficient.
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45
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46 PYM_JSObject *object;
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47 char *string;
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48
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49 if (!JS_CStringsAreUTF8()) {
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50 PyErr_SetString(PyExc_NotImplementedError,
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51 "Data type conversion not implemented.");
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52 return NULL;
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53 }
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54
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55 if (!PyArg_ParseTuple(args, "O!es", &PYM_JSObjectType, &object,
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56 "utf-8", &string))
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57 return NULL;
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58
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59 JSString *jsString = JS_NewStringCopyZ(self->cx, string);
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60 if (jsString == NULL) {
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61 PyMem_Free(string);
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62 PyErr_SetString(PYM_error, "JS_NewStringCopyZ() failed");
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63 return NULL;
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64 }
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65
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66 jsval val;
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67 if (!JS_GetUCProperty(self->cx, object->obj,
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68 JS_GetStringChars(jsString),
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69 JS_GetStringLength(jsString), &val)) {
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70 // TODO: Get the actual JS exception. Any exception that exists
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71 // here will probably still be pending on the JS context.
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72 PyMem_Free(string);
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73 PyErr_SetString(PYM_error, "Getting property failed.");
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74 return NULL;
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75 }
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76
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77 PyMem_Free(string);
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78 return PYM_jsvalToPyObject(self, val);
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79 }
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80
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81 static PyObject *
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82 PYM_initStandardClasses(PYM_JSContextObject *self, PyObject *args)
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83 {
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84 PYM_JSObject *object;
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85
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86 if (!PyArg_ParseTuple(args, "O!", &PYM_JSObjectType, &object))
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87 return NULL;
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88
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89 if (!JS_InitStandardClasses(self->cx, object->obj)) {
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90 PyErr_SetString(PYM_error, "JS_InitStandardClasses() failed");
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91 return NULL;
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92 }
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93
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94 Py_RETURN_NONE;
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95 }
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96
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97 static PyObject *
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98 PYM_evaluateScript(PYM_JSContextObject *self, PyObject *args)
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99 {
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100 PYM_JSObject *object;
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101 const char *source;
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102 int sourceLen;
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103 const char *filename;
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104 int lineNo;
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105
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106 if (!PyArg_ParseTuple(args, "O!s#si", &PYM_JSObjectType, &object,
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107 &source, &sourceLen, &filename, &lineNo))
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108 return NULL;
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109
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110 JS_BeginRequest(self->cx);
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111
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112 jsval rval;
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113 if (!JS_EvaluateScript(self->cx, object->obj, source, sourceLen,
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114 filename, lineNo, &rval)) {
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115 // TODO: Actually get the error that was raised.
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116 PyErr_SetString(PYM_error, "Script failed");
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117 JS_EndRequest(self->cx);
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118 return NULL;
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119 }
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120
21
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121 PyObject *pyRval = PYM_jsvalToPyObject(self, rval);
16
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122
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123 JS_EndRequest(self->cx);
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124
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125 return pyRval;
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126 }
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127
24
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128 static JSBool dispatchJSFunctionToPython(JSContext *cx,
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129 JSObject *obj,
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130 uintN argc,
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131 jsval *argv,
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132 jsval *rval)
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133 {
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134 jsval callee = JS_ARGV_CALLEE(argv);
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135 jsval jsCallable;
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136 if (!JS_GetReservedSlot(cx, JSVAL_TO_OBJECT(callee), 0, &jsCallable)) {
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137 JS_ReportError(cx, "JS_GetReservedSlot() failed.");
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138 return JS_FALSE;
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139 }
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140 PyObject *callable = (PyObject *) JSVAL_TO_PRIVATE(jsCallable);
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141
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142 // TODO: Convert args and 'this' parameter.
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143 PyObject *args = PyTuple_New(0);
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144 if (args == NULL) {
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145 JS_ReportOutOfMemory(cx);
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146 return JS_FALSE;
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147 }
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148
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149 PyObject *result = PyObject_Call(callable, args, NULL);
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150 if (result == NULL) {
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151 // TODO: Get the actual exception.
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152 JS_ReportError(cx, "Python function failed.");
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153 return JS_FALSE;
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154 }
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155
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156 // TODO: Convert result to JS value.
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157 Py_DECREF(result);
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158
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159 return JS_TRUE;
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160 }
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161
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162 static PyObject *
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163 PYM_defineFunction(PYM_JSContextObject *self, PyObject *args)
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164 {
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165 PYM_JSObject *object;
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166 PyObject *callable;
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167 const char *name;
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168
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169 if (!PyArg_ParseTuple(args, "O!Os", &PYM_JSObjectType, &object,
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170 &callable, &name))
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171 return NULL;
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172
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173 if (!PyCallable_Check(callable)) {
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174 PyErr_SetString(PyExc_TypeError, "Callable must be callable");
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175 return NULL;
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176 }
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177
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178 // TODO: Support unicode naming.
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179 JSFunction *func = JS_DefineFunction(self->cx, object->obj, name,
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180 dispatchJSFunctionToPython,
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181 0, JSPROP_ENUMERATE);
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182 if (func == NULL) {
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183 PyErr_SetString(PYM_error, "JS_DefineFunction() failed");
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184 return NULL;
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185 }
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186
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187 JSObject *funcObj = JS_GetFunctionObject(func);
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188
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189 if (funcObj == NULL) {
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190 PyErr_SetString(PYM_error, "JS_GetFunctionObject() failed");
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191 return NULL;
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192 }
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193
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194 if (!JS_SetReservedSlot(self->cx, funcObj, 0,
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195 PRIVATE_TO_JSVAL(callable))) {
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196 PyErr_SetString(PYM_error, "JS_SetReservedSlot() failed");
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197 return NULL;
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198 }
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199
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200 // TODO: When to decref?
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201 Py_INCREF(callable);
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202
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203 Py_RETURN_NONE;
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204 }
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205
11
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206 static PyMethodDef PYM_JSContextMethods[] = {
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207 {"get_runtime", (PyCFunction) PYM_getRuntime, METH_VARARGS,
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208 "Get the JavaScript runtime associated with this context."},
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209 {"new_object", (PyCFunction) PYM_newObject, METH_VARARGS,
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210 "Create a new JavaScript object."},
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211 {"init_standard_classes",
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212 (PyCFunction) PYM_initStandardClasses, METH_VARARGS,
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213 "Add standard classes and functions to the given object."},
16
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214 {"evaluate_script",
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215 (PyCFunction) PYM_evaluateScript, METH_VARARGS,
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216 "Evaluate the given JavaScript code in the context of the given "
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217 "global object, using the given filename"
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218 "and line number information."},
24
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219 {"define_function",
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220 (PyCFunction) PYM_defineFunction, METH_VARARGS,
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221 "Defines a function callable from JS."},
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0812422ec99e Added a context.get_property() method.
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222 {"get_property", (PyCFunction) PYM_getProperty, METH_VARARGS,
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223 "Gets the given property for the given JavaScript object."},
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224 {NULL, NULL, 0, NULL}
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225 };
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226
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227 PyTypeObject PYM_JSContextType = {
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228 PyObject_HEAD_INIT(NULL)
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229 0, /*ob_size*/
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230 "pymonkey.Context", /*tp_name*/
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6d95cfaa1e0b Fixed a code typo.
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231 sizeof(PYM_JSContextObject), /*tp_basicsize*/
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232 0, /*tp_itemsize*/
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233 /*tp_dealloc*/
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234 (destructor) PYM_JSContextDealloc,
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235 0, /*tp_print*/
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236 0, /*tp_getattr*/
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237 0, /*tp_setattr*/
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238 0, /*tp_compare*/
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239 0, /*tp_repr*/
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240 0, /*tp_as_number*/
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241 0, /*tp_as_sequence*/
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242 0, /*tp_as_mapping*/
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243 0, /*tp_hash */
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244 0, /*tp_call*/
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245 0, /*tp_str*/
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246 0, /*tp_getattro*/
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247 0, /*tp_setattro*/
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248 0, /*tp_as_buffer*/
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249 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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diff changeset
250 /* tp_doc */
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251 "JavaScript Context.",
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252 0, /* tp_traverse */
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253 0, /* tp_clear */
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254 0, /* tp_richcompare */
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255 0, /* tp_weaklistoffset */
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256 0, /* tp_iter */
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diff changeset
257 0, /* tp_iternext */
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258 PYM_JSContextMethods, /* tp_methods */
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259 0, /* tp_members */
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260 0, /* tp_getset */
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261 0, /* tp_base */
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262 0, /* tp_dict */
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263 0, /* tp_descr_get */
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264 0, /* tp_descr_set */
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265 0, /* tp_dictoffset */
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266 0, /* tp_init */
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267 0, /* tp_alloc */
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268 0, /* tp_new */
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269 };
19
fbb9a61fa030 Moved context creation code into its own public function in context.c.
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270
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diff changeset
271 extern PYM_JSContextObject *
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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272 PYM_newJSContextObject(PYM_JSRuntimeObject *runtime, JSContext *cx)
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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273 {
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
diff changeset
274 PYM_JSContextObject *context = PyObject_New(PYM_JSContextObject,
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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275 &PYM_JSContextType);
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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276 if (context == NULL)
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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277 return NULL;
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
diff changeset
278
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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279 context->runtime = runtime;
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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280 Py_INCREF(runtime);
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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281
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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282 context->cx = cx;
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
diff changeset
283
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
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284 return context;
fbb9a61fa030 Moved context creation code into its own public function in context.c.
Atul Varma <varmaa@toolness.com>
parents: 18
diff changeset
285 }