1 | // -*- c++ -*- |
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2 | //***************************************************************************** |
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3 | /** @file pyobject.cc |
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4 | * |
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5 | * @author Alexander Dreyer |
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6 | * @date 2010-12-15 |
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7 | * |
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8 | * This file defines the @c blackbox operations for the pyobject type. |
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9 | * |
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10 | * @par Copyright: |
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11 | * (c) 2010 by The Singular Team, see LICENSE file |
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12 | **/ |
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13 | //***************************************************************************** |
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14 | |
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15 | |
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16 | |
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17 | |
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18 | |
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19 | #include <Singular/mod2.h> |
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20 | |
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21 | #include <Singular/ipid.h> |
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22 | #include <Singular/blackbox.h> |
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23 | #include <omalloc/omalloc.h> |
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24 | #include <kernel/febase.h> |
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25 | #include <kernel/longrat.h> |
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26 | #include <Singular/subexpr.h> |
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27 | |
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28 | #include <Singular/lists.h> |
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29 | |
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30 | #include <Python.h> |
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31 | #include <iterator> // std::distance |
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32 | #include <stdio.h> |
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33 | |
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34 | void sync_contexts(); |
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35 | |
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36 | /** @class PythonInterpreter |
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37 | * This class initializes and finalized the python interpreter. |
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38 | * |
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39 | * It also stores the Singular token number, which is assigned to this type on |
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40 | * runtime. |
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41 | **/ |
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42 | class PythonInterpreter { |
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43 | public: |
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44 | typedef int id_type; |
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45 | |
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46 | ~PythonInterpreter() { if(m_owns_python) Py_Finalize(); } |
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47 | |
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48 | /// Initialize unique (singleton) python interpreter instance, |
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49 | /// and set Singular type identifier |
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50 | static void init(id_type num ) { instance().m_id = num; } |
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51 | |
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52 | /// Get Singular type identitfier |
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53 | static id_type id() { return instance().m_id; } |
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54 | |
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55 | private: |
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56 | /// Singleton: Only init() is allowed to construct an instance |
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57 | PythonInterpreter(): |
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58 | m_id(0), m_owns_python(false) { start_python(); } |
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59 | |
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60 | /// Static initialization - |
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61 | /// safely takes care of destruction on program termination |
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62 | static PythonInterpreter& instance() |
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63 | { |
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64 | static PythonInterpreter init_interpreter; |
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65 | return init_interpreter; |
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66 | } |
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67 | |
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68 | void start_python() |
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69 | { |
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70 | if (!Py_IsInitialized()) init_python(); |
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71 | set_python_defaults(); |
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72 | } |
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73 | |
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74 | void init_python() |
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75 | { |
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76 | Py_Initialize(); |
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77 | m_owns_python = true; |
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78 | } |
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79 | |
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80 | void set_python_defaults() |
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81 | { |
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82 | // Sone python modules needs argc, argv set for some reason |
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83 | char* argv = ""; |
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84 | PySys_SetArgv(1, &argv); |
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85 | PyRun_SimpleString("from sys import path, modules"); |
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86 | PyRun_SimpleString("_SINGULAR_IMPORTED = dict()"); |
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87 | |
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88 | char cmd[MAXPATHLEN + 20]; |
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89 | sprintf(cmd, "path.insert(0, '%s')", feGetResource('b')); |
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90 | PyRun_SimpleString(cmd); |
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91 | PyRun_SimpleString("del path"); // cleanup |
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92 | } |
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93 | |
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94 | id_type m_id; |
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95 | bool m_owns_python; |
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96 | }; |
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97 | |
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98 | /** @class PythonObject |
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99 | * This class defines an interface for calling PyObject from Singular. |
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100 | * |
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101 | * @note This class does not take care of the memory mangement, this is done in |
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102 | * the blackbox routines. |
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103 | **/ |
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104 | class PythonObject |
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105 | { |
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106 | typedef PythonObject self; |
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107 | |
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108 | public: |
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109 | typedef PyObject* ptr_type; |
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110 | struct sequence_tag{}; |
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111 | |
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112 | PythonObject(): m_ptr(Py_None) { } |
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113 | PythonObject(ptr_type ptr): m_ptr(ptr) {if (!ptr) handle_exception();} |
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114 | |
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115 | ptr_type check_context(ptr_type ptr) const { |
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116 | if(ptr) sync_contexts(); |
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117 | return ptr; |
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118 | } |
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119 | /// Unary operations |
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120 | self operator()(int op) const |
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121 | { |
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122 | switch(op) |
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123 | { |
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124 | case '(': return check_context(PyObject_CallObject(*this, NULL)); |
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125 | case ATTRIB_CMD: return PyObject_Dir(*this); |
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126 | case PROC_CMD: return *this; |
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127 | } |
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128 | |
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129 | if (op == PythonInterpreter::id()) |
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130 | return *this; |
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131 | |
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132 | Werror("unary op %d not implemented for pyobject", op); |
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133 | return self(); |
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134 | } |
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135 | |
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136 | /// Binary and n-ary operations |
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137 | self operator()(int op, const self& arg) const { |
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138 | |
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139 | switch(op) |
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140 | { |
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141 | case '+': return PyNumber_Add(*this, arg); |
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142 | case '-': return PyNumber_Subtract(*this, arg); |
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143 | case '*': return PyNumber_Multiply(*this, arg); |
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144 | case '/': return PyNumber_Divide(*this, arg); |
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145 | case '^': return PyNumber_Power(*this, arg, Py_None); |
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146 | case '(': return check_context(PyObject_CallObject(*this, arg)); |
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147 | case '[': return operator[](arg); |
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148 | case KILLATTR_CMD: return del_attr(arg); |
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149 | case LIST_CMD: return args2list(arg); |
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150 | case '.': case COLONCOLON: case ATTRIB_CMD: return attr(arg); |
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151 | } |
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152 | Werror("binary op %d not implemented for pyobject!", op); |
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153 | |
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154 | return self(); |
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155 | } |
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156 | |
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157 | /// Ternary operations |
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158 | self operator()(int op, const self& arg1, const self& arg2) const |
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159 | { |
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160 | switch(op) |
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161 | { |
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162 | case ATTRIB_CMD: PyObject_SetAttr(*this, arg1, arg2); return self(); |
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163 | } |
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164 | |
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165 | Werror("ternary op %d not implemented for pyobject!", op); |
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166 | return self(); |
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167 | } |
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168 | |
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169 | /// Get item |
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170 | self operator[](const self& idx) const { return PyObject_GetItem(*this, idx); } |
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171 | self operator[](long idx) const { return operator[](PyInt_FromLong(idx)); } |
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172 | |
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173 | /// Get actual PyObject* |
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174 | operator const ptr_type() const { return m_ptr; } |
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175 | |
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176 | /// Get representative as C-style string |
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177 | char* repr() const |
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178 | { |
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179 | return omStrDup(PyString_AsString(PyObject_Repr(*this))); |
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180 | } |
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181 | |
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182 | /// Extract C-style string |
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183 | char* str() const { return omStrDup(PyString_AsString(*this)); } |
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184 | |
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185 | Py_ssize_t size() const { return PyObject_Size(m_ptr); } |
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186 | |
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187 | BOOLEAN assign_to(leftv result) |
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188 | { |
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189 | return (m_ptr == Py_None? none_to(result): python_to(result)); |
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190 | } |
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191 | |
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192 | void import_as(const char* name) const { |
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193 | idhdl handle = enterid(omStrDup(name), 0, DEF_CMD, |
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194 | &IDROOT, FALSE); |
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195 | |
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196 | if (handle) |
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197 | { |
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198 | IDDATA(handle) = (char*)m_ptr; |
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199 | Py_XINCREF(m_ptr); |
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200 | IDTYP(handle) = PythonInterpreter::id(); |
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201 | } |
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202 | else { Werror("Importing pyobject to Singular failed"); } |
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203 | } |
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204 | |
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205 | int compare(int op, const self& arg) const |
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206 | { return PyObject_RichCompareBool(*this, arg, py_opid(op)); } |
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207 | |
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208 | |
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209 | self attr(const self& arg) const { return PyObject_GetAttr(*this, arg); } |
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210 | |
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211 | self del_attr(const self& arg) const |
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212 | { |
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213 | if (!PyObject_HasAttr(*this, arg)) |
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214 | Werror("Cannot delete attribute %s.", arg.repr()); |
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215 | else |
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216 | PyObject_DelAttr(*this, arg); |
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217 | |
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218 | return self(); |
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219 | } |
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220 | |
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221 | protected: |
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222 | self args2list(const self& args) const |
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223 | { |
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224 | self pylist(PyList_New(0)); |
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225 | PyList_Append(pylist, *this); |
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226 | if(PyTuple_Check(args)) pylist.append_iter(PyObject_GetIter(args)); |
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227 | else PyList_Append(pylist, args); |
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228 | |
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229 | return pylist; |
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230 | } |
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231 | |
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232 | void handle_exception() { |
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233 | |
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234 | PyObject *pType, *pMessage, *pTraceback; |
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235 | PyErr_Fetch(&pType, &pMessage, &pTraceback); |
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236 | |
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237 | Werror("pyobject error occured"); |
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238 | Werror(PyString_AsString(pMessage)); |
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239 | |
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240 | Py_XDECREF(pType); |
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241 | Py_XDECREF(pMessage); |
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242 | Py_XDECREF(pTraceback); |
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243 | |
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244 | PyErr_Clear(); |
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245 | } |
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246 | |
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247 | void append_iter(self iterator) { |
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248 | ptr_type item; |
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249 | while (item = PyIter_Next(iterator)) { |
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250 | PyList_Append(*this, item); |
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251 | Py_DECREF(item); |
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252 | } |
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253 | } |
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254 | |
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255 | int py_opid(int op) const{ |
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256 | switch(op) |
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257 | { |
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258 | case '<': return Py_LT; |
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259 | case '>': return Py_GT; |
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260 | case EQUAL_EQUAL: return Py_EQ; |
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261 | case NOTEQUAL: return Py_NE; |
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262 | case GE: return Py_GE; |
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263 | case LE: return Py_LE; |
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264 | } |
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265 | return -1; |
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266 | } |
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267 | |
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268 | private: |
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269 | BOOLEAN none_to(leftv result) const |
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270 | { |
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271 | result->data = NULL; |
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272 | result->rtyp = NONE; |
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273 | return FALSE; |
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274 | } |
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275 | |
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276 | BOOLEAN python_to(leftv result) const |
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277 | { |
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278 | result->data = m_ptr; |
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279 | result->rtyp = PythonInterpreter::id(); |
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280 | return !m_ptr; |
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281 | } |
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282 | |
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283 | /// The actual pointer |
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284 | ptr_type m_ptr; |
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285 | }; |
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286 | |
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287 | |
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288 | |
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289 | /** @class PythonCastStatic |
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290 | * This template class does conversion of Singular objects to python objects on |
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291 | * compile-time. |
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292 | * |
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293 | * @note The Singular objects are assumed to be equivalent to the template argument. |
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294 | **/ |
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295 | template <class CastType = PythonObject::ptr_type> |
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296 | class PythonCastStatic: |
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297 | public PythonObject { |
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298 | public: |
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299 | |
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300 | PythonCastStatic(void* value): |
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301 | PythonObject(get(reinterpret_cast<CastType>(value))) {} |
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302 | |
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303 | PythonCastStatic(leftv value): |
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304 | PythonObject(get(reinterpret_cast<CastType>(value->Data()))) {} |
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305 | |
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306 | private: |
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307 | ptr_type get(ptr_type value) { return value; } |
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308 | ptr_type get(long value) { return PyInt_FromLong(value); } |
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309 | ptr_type get(const char* value) { return PyString_FromString(value); } |
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310 | ptr_type get(char* value) { return get(const_cast<const char*>(value)); } |
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311 | ptr_type get(lists value); // inlined after PythonObjectDynamic |
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312 | }; |
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313 | |
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314 | |
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315 | |
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316 | /** @class PythonCastDynamic |
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317 | * This class does conversion of Singular objects to python objects on runtime. |
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318 | * |
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319 | **/ |
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320 | class PythonCastDynamic: |
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321 | public PythonObject { |
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322 | typedef PythonCastDynamic self; |
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323 | |
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324 | public: |
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325 | PythonCastDynamic(leftv value): PythonObject(get(value, value->Typ())) {} |
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326 | |
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327 | private: |
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328 | PythonObject get(leftv value, int typeId) |
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329 | { |
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330 | if (typeId == PythonInterpreter::id()) return PythonCastStatic<>(value); |
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331 | |
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332 | switch (typeId) |
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333 | { |
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334 | case INT_CMD: return PythonCastStatic<long>(value); |
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335 | case STRING_CMD: return PythonCastStatic<const char*>(value); |
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336 | case LIST_CMD: return PythonCastStatic<lists>(value); |
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337 | // case UNKNOWN: return PythonCastStatic<const char*>((void*)value->Name()); |
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338 | } |
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339 | |
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340 | Werror("type # %d incompatible with pyobject", typeId); |
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341 | return PythonObject(); |
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342 | } |
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343 | }; |
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344 | |
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345 | template <class CastType> |
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346 | inline PythonObject::ptr_type |
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347 | PythonCastStatic<CastType>::get(lists value) |
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348 | { |
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349 | ptr_type pylist(PyList_New(0)); |
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350 | for (std::size_t i = 0; i <= value->nr; ++i) |
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351 | PyList_Append(pylist, PythonCastDynamic((value->m) + i)); |
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352 | |
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353 | return pylist; |
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354 | } |
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355 | |
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356 | /// Template specialization for getting handling sequence |
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357 | template <> |
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358 | class PythonCastStatic<PythonObject::sequence_tag>: |
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359 | public PythonObject |
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360 | { |
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361 | public: |
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362 | |
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363 | PythonCastStatic(leftv value): |
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364 | PythonObject(PyTuple_New(size(value))) { append_to(value); } |
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365 | |
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366 | |
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367 | private: |
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368 | std::size_t size(leftv iter, std::size_t distance = 0) const |
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369 | { |
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370 | if (iter) { do { ++distance; } while(iter = iter->next); }; |
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371 | return distance; |
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372 | } |
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373 | |
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374 | void append_to(leftv iter) const |
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375 | { |
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376 | for(std::size_t idx = 0; iter != NULL; iter = iter->next) |
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377 | PyTuple_SetItem(*this, idx++, PythonCastDynamic(iter)); |
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378 | } |
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379 | }; |
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380 | |
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381 | |
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382 | PythonObject get_attrib_name(leftv arg) |
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383 | { |
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384 | typedef PythonCastStatic<const char*> result_type; |
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385 | if (arg->Typ() == STRING_CMD) |
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386 | return result_type(arg); |
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387 | |
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388 | return result_type((void*)arg->Name()); |
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389 | } |
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390 | |
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391 | /// Evaluate string in python |
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392 | PythonObject python_eval(const char* arg) { |
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393 | |
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394 | PyObject* globals = PyModule_GetDict(PyImport_Import(PyString_FromString("__main__"))); |
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395 | return PyRun_String(arg, Py_eval_input, globals, globals); |
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396 | } |
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397 | |
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398 | /// Evaluate string in python from Singular |
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399 | BOOLEAN python_eval(leftv result, leftv arg) { |
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400 | if ( !arg || (arg->Typ() != STRING_CMD) ) { |
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401 | Werror("expected python_eval('string')"); |
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402 | return TRUE; |
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403 | } |
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404 | |
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405 | return python_eval(reinterpret_cast<const char*>(arg->Data())).assign_to(result); |
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406 | } |
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407 | |
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408 | |
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409 | /// Execute string in python from Singular |
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410 | BOOLEAN python_run(leftv result, leftv arg) |
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411 | { |
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412 | if ( !arg || (arg->Typ() != STRING_CMD) ) { |
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413 | Werror("expected python_run('string')"); |
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414 | return TRUE; |
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415 | } |
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416 | |
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417 | PyRun_SimpleString(reinterpret_cast<const char*>(arg->Data())); |
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418 | sync_contexts(); |
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419 | return PythonCastStatic<>(Py_None).assign_to(result); |
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420 | } |
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421 | |
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422 | PythonObject names_from_module(const char* module_name) |
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423 | { |
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424 | char buffer[strlen(module_name) + 30]; |
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425 | sprintf (buffer, "SINGULAR_MODULE_NAME = '%s'", module_name); |
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426 | PyRun_SimpleString(buffer); |
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427 | PyRun_SimpleString("from sys import modules"); |
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428 | PyRun_SimpleString("exec('from ' + SINGULAR_MODULE_NAME + ' import *')"); |
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429 | |
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430 | return python_eval("[str for str in dir(modules[SINGULAR_MODULE_NAME]) if str[0] != '_']"); |
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431 | } |
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432 | |
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433 | void from_module_import_all(const char* module_name) |
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434 | { |
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435 | char buffer[strlen(module_name) + 20]; |
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436 | sprintf (buffer, "from %s import *", module_name); |
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437 | PyRun_SimpleString(buffer); |
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438 | } |
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439 | |
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440 | /// import python module and export identifiers in Singular namespace |
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441 | BOOLEAN python_import(leftv result, leftv value) { |
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442 | |
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443 | if ((value == NULL) || (value->Typ()!= STRING_CMD)) { |
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444 | Werror("expected python_import('string')"); |
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445 | return TRUE; |
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446 | } |
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447 | |
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448 | from_module_import_all(reinterpret_cast<const char*>(value->Data())); |
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449 | sync_contexts(); |
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450 | |
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451 | return PythonCastStatic<>(Py_None).assign_to(result); |
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452 | } |
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453 | |
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454 | /// blackbox support - initialization |
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455 | void* pyobject_Init(blackbox*) |
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456 | { |
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457 | return Py_None; |
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458 | } |
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459 | |
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460 | /// blackbox support - convert to string representation |
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461 | char* pyobject_String(blackbox *b, void* ptr) |
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462 | { |
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463 | return PythonCastStatic<>(ptr).repr(); |
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464 | } |
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465 | |
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466 | /// blackbox support - copy element |
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467 | void* pyobject_Copy(blackbox*b, void* ptr) |
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468 | { |
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469 | Py_XINCREF(ptr); |
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470 | return ptr; |
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471 | } |
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472 | |
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473 | /// blackbox support - assign element |
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474 | BOOLEAN pyobject_Assign(leftv l, leftv r) |
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475 | { |
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476 | Py_XDECREF(l->Data()); |
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477 | PyObject* result = PythonCastDynamic(r); |
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478 | Py_XINCREF(result); |
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479 | |
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480 | if (l->rtyp == IDHDL) |
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481 | IDDATA((idhdl)l->data) = (char *)result; |
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482 | else |
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483 | l->data = (void *)result; |
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484 | |
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485 | return !result; |
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486 | } |
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487 | |
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488 | |
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489 | /// blackbox support - unary operations |
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490 | BOOLEAN pyobject_Op1(int op, leftv res, leftv head) |
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491 | { |
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492 | switch(op) |
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493 | { |
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494 | case INT_CMD: // built-in return types first |
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495 | { |
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496 | long value = PyInt_AsLong(PythonCastStatic<>(head)); |
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497 | if( (value == -1) && PyErr_Occurred() ) { |
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498 | Werror("pyobject cannot be converted to integer"); |
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499 | PyErr_Clear(); |
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500 | return TRUE; |
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501 | } |
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502 | res->data = (void*) value; |
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503 | res->rtyp = INT_CMD; |
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504 | return FALSE; |
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505 | } |
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506 | case TYPEOF_CMD: |
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507 | res->data = (void*) omStrDup("pyobject"); |
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508 | res->rtyp = STRING_CMD; |
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509 | return FALSE; |
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510 | |
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511 | case LIST_CMD: |
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512 | return FALSE; |
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513 | |
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514 | } |
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515 | return PythonCastStatic<>(head)(op).assign_to(res); |
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516 | } |
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517 | |
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518 | |
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519 | /// blackbox support - binary operations |
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520 | BOOLEAN pyobject_Op2(int op, leftv res, leftv arg1, leftv arg2) |
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521 | { |
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522 | PythonCastStatic<> lhs(arg1); |
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523 | |
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524 | switch(op) // built-in return types and special cases first |
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525 | { |
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526 | case '<': case '>': case EQUAL_EQUAL: case NOTEQUAL: case GE: case LE: |
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527 | { |
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528 | res->data = (void *)lhs.compare(op, PythonCastDynamic(arg2)); |
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529 | res->rtyp = INT_CMD; |
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530 | return FALSE; |
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531 | } |
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532 | case '.': case COLONCOLON: case ATTRIB_CMD: |
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533 | return lhs.attr(get_attrib_name(arg2)).assign_to(res); |
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534 | } |
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535 | PythonCastDynamic rhs(arg2); |
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536 | return lhs(op, rhs).assign_to(res); |
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537 | } |
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538 | |
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539 | /// blackbox support - ternary operations |
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540 | BOOLEAN pyobject_Op3(int op, leftv res, leftv arg1, leftv arg2, leftv arg3) |
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541 | { |
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542 | PythonCastStatic<> lhs(arg1); |
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543 | PythonCastDynamic rhs1(arg2); |
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544 | PythonCastDynamic rhs2(arg3); |
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545 | |
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546 | return lhs(op, rhs1, rhs2).assign_to(res); |
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547 | } |
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548 | |
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549 | |
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550 | /// blackbox support - n-ary operations |
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551 | BOOLEAN pyobject_OpM(int op, leftv res, leftv args) |
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552 | { |
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553 | typedef PythonCastStatic<PythonObject::sequence_tag> seq_type; |
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554 | |
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555 | switch(op) // built-in return types first |
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556 | { |
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557 | case STRING_CMD: |
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558 | { |
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559 | blackbox* a = getBlackboxStuff(args->Typ()); |
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560 | res->data = (void *)a->blackbox_String(a, args->Data()); |
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561 | res->rtyp = STRING_CMD; |
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562 | return FALSE; |
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563 | } |
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564 | } |
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565 | |
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566 | typedef PythonCastStatic<PythonObject::sequence_tag> seq_type; |
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567 | return PythonCastStatic<>(args)(op, seq_type(args->next)).assign_to(res); |
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568 | } |
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569 | |
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570 | /// blackbox support - destruction |
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571 | void pyobject_destroy(blackbox *b, void* ptr) |
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572 | { |
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573 | Py_XDECREF(ptr); |
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574 | } |
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575 | |
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576 | PyObject* get_current_definition(const char* name) { |
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577 | idhdl handle = ggetid(name); |
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578 | if (!handle || (IDTYP(handle) != PythonInterpreter::id())) return NULL; |
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579 | PythonCastStatic<PyObject*> value(IDDATA(handle)); |
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580 | return value; |
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581 | } |
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582 | |
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583 | /// getting stuff from python to Singular namespace |
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584 | void sync_contexts() |
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585 | { |
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586 | PyRun_SimpleString("_SINGULAR_NEW = modules['__main__'].__dict__.copy()"); |
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587 | |
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588 | PythonObject newElts = python_eval("[(_k, _e) \ |
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589 | for (_k, _e) in _SINGULAR_NEW.iteritems() \ |
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590 | if _k not in _SINGULAR_IMPORTED or not _SINGULAR_IMPORTED[_k] is _e]"); |
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591 | |
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592 | long len = newElts.size(); |
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593 | for (long idx = 0; idx < len; ++idx) |
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594 | { |
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595 | char* name = newElts[idx][0].str(); |
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596 | if (name && (*name != '\0') && (*name != '_')) |
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597 | { |
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598 | Py_XDECREF(get_current_definition(name)); |
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599 | newElts[idx][1].import_as(name); |
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600 | } |
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601 | |
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602 | } |
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603 | |
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604 | PythonObject deletedElts = |
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605 | python_eval("list(set(_SINGULAR_IMPORTED.iterkeys()) - \ |
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606 | set(_SINGULAR_NEW.iterkeys()))"); |
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607 | len = deletedElts.size(); |
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608 | |
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609 | for (long idx = 0; idx < len; ++idx) |
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610 | { |
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611 | char* name = deletedElts[idx].str(); |
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612 | if (name && (*name != '\0') && (*name != '_')) |
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613 | killid(name, &IDROOT); |
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614 | } |
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615 | |
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616 | PyRun_SimpleString("_SINGULAR_IMPORTED =_SINGULAR_NEW"); |
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617 | PyRun_SimpleString("del _SINGULAR_NEW"); |
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618 | } |
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619 | |
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620 | |
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621 | // forward declaration |
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622 | int iiAddCproc(char *libname, char *procname, BOOLEAN pstatic, |
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623 | BOOLEAN(*func)(leftv res, leftv v)); |
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624 | |
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625 | #define ADD_C_PROC(name) iiAddCproc("", (char*)#name, FALSE, name); |
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626 | |
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627 | |
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628 | void pyobject_init() |
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629 | { |
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630 | blackbox *b = (blackbox*)omAlloc0(sizeof(blackbox)); |
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631 | b->blackbox_destroy = pyobject_destroy; |
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632 | b->blackbox_String = pyobject_String; |
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633 | b->blackbox_Init = pyobject_Init; |
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634 | b->blackbox_Copy = pyobject_Copy; |
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635 | b->blackbox_Assign = pyobject_Assign; |
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636 | b->blackbox_Op1 = pyobject_Op1; |
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637 | b->blackbox_Op2 = pyobject_Op2; |
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638 | b->blackbox_Op3 = pyobject_Op3; |
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639 | b->blackbox_OpM = pyobject_OpM; |
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640 | |
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641 | PythonInterpreter::init(setBlackboxStuff(b,"pyobject")); |
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642 | |
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643 | ADD_C_PROC(python_import); |
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644 | ADD_C_PROC(python_eval); |
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645 | ADD_C_PROC(python_run); |
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646 | } |
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647 | |
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648 | extern "C" { void mod_init() { pyobject_init(); } } |
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649 | |
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