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annotate src/ast_convert.rs @ 0:211b0df72e64

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Hello world!
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 29 May 2016 19:15:02 +0100
parents
children b90e49ab734b
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0
211b0df72e64 Hello world!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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1 use python_ast::{Module, Statement, Expr, BinOp};
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2
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3 use cpython::{Python, PyObject};
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4 use cpython::ObjectProtocol; //for call method
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5
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6 fn parse_expr_vec(py: Python, ast: PyObject) -> Vec<Expr> {
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7 let builtins_module = py.import("builtins").unwrap();
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8 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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9
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10 let is_instance = |object: &PyObject, type_: &PyObject| {
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11 return isinstance.call(py, (object, type_), None).unwrap().is_true(py).unwrap();
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12 };
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13
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14 let ast_module = py.import("ast").unwrap();
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15 let ast_type = ast_module.get(py, "AST").unwrap();
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16 let arguments_type = ast_module.get(py, "arguments").unwrap();
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17
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18 assert!(is_instance(&ast, &ast_type));
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19
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20 if is_instance(&ast, &arguments_type) {
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21 let args = ast.getattr(py, "args").unwrap();
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22 let mut arguments = vec!();
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23 for arg in args.iter(py).unwrap() {
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24 let arg = parse_expr(py, arg.unwrap());
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25 arguments.push(arg);
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26 }
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27 arguments
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28 } else {
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29 vec!(Expr::Error)
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30 }
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31 }
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32
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33 fn parse_binop(py: Python, ast: PyObject) -> BinOp {
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34 let builtins_module = py.import("builtins").unwrap();
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35 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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36
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37 let is_instance = |object: &PyObject, type_: &PyObject| {
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38 return isinstance.call(py, (object, type_), None).unwrap().is_true(py).unwrap();
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39 };
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40
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41 let ast_module = py.import("ast").unwrap();
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42 let ast_type = ast_module.get(py, "AST").unwrap();
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43 let add_type = ast_module.get(py, "Add").unwrap();
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44 let mult_type = ast_module.get(py, "Mult").unwrap();
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45 let eq_type = ast_module.get(py, "Eq").unwrap();
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46 let lt_type = ast_module.get(py, "Lt").unwrap();
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47
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48 assert!(is_instance(&ast, &ast_type));
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49
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50 if is_instance(&ast, &add_type) {
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51 BinOp::BinAdd
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52 } else if is_instance(&ast, &mult_type) {
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53 BinOp::BinMult
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54 } else if is_instance(&ast, &eq_type) {
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55 BinOp::BinEq
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56 } else if is_instance(&ast, &lt_type) {
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57 BinOp::BinLt
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58 } else {
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59 println!("BinOp {}", ast);
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60 BinOp::Error
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61 }
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62 }
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63
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64 fn parse_expr(py: Python, ast: PyObject) -> Expr {
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65 let builtins_module = py.import("builtins").unwrap();
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66 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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67
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68 let is_instance = |object: &PyObject, type_: &PyObject| {
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69 return isinstance.call(py, (object, type_), None).unwrap().is_true(py).unwrap();
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70 };
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71
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72 let ast_module = py.import("ast").unwrap();
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73 let ast_type = ast_module.get(py, "AST").unwrap();
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74 let arg_type = ast_module.get(py, "arg").unwrap();
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75 let bin_op_type = ast_module.get(py, "BinOp").unwrap();
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76 let name_constant_type = ast_module.get(py, "NameConstant").unwrap();
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77 let name_type = ast_module.get(py, "Name").unwrap();
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78 let num_type = ast_module.get(py, "Num").unwrap();
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79 let str_type = ast_module.get(py, "Str").unwrap();
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80 let compare_type = ast_module.get(py, "Compare").unwrap();
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81 let call_type = ast_module.get(py, "Call").unwrap();
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82 let alias_type = ast_module.get(py, "alias").unwrap();
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83
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84 assert!(is_instance(&ast, &ast_type));
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85
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86 if is_instance(&ast, &arg_type) {
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87 let arg = {
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88 let arg = ast.getattr(py, "arg").unwrap();
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89 let arg = arg.str(py).unwrap();
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90 let mut arg = arg.to_string(py).unwrap();
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91 arg.to_mut().to_string()
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92 };
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93 Expr::Name(arg)
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94 } else if is_instance(&ast, &name_type) {
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95 let id = {
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96 let id = ast.getattr(py, "id").unwrap();
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97 let id = id.str(py).unwrap();
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98 let mut id = id.to_string(py).unwrap();
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99 id.to_mut().to_string()
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100 };
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101 Expr::Name(id)
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102 } else if is_instance(&ast, &name_constant_type) {
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103 let value = {
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104 let value = ast.getattr(py, "value").unwrap();
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105 let value = value.str(py).unwrap();
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106 let mut value = value.to_string(py).unwrap();
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107 value.to_mut().to_string()
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108 };
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109 Expr::NameConstant(value)
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110 } else if is_instance(&ast, &num_type) {
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111 let n = {
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112 let n = ast.getattr(py, "n").unwrap();
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113 let n = n.str(py).unwrap();
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114 let mut n = n.to_string(py).unwrap();
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115 n.to_mut().to_string()
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116 };
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117 Expr::Num(n)
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118 } else if is_instance(&ast, &str_type) {
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119 let s = {
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120 let s = ast.getattr(py, "s").unwrap();
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121 let s = s.str(py).unwrap();
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122 let mut s = s.to_string(py).unwrap();
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123 s.to_mut().to_string()
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124 };
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125 Expr::Str(s)
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126 } else if is_instance(&ast, &bin_op_type) {
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127 let left = ast.getattr(py, "left").unwrap();
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128 let op = ast.getattr(py, "op").unwrap();
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129 let right = ast.getattr(py, "right").unwrap();
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130
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131 let left = parse_expr(py, left);
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132 let op = parse_binop(py, op);
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133 let right = parse_expr(py, right);
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134
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135 Expr::BinOp(Box::new(left), op, Box::new(right))
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136 } else if is_instance(&ast, &call_type) {
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137 let func = ast.getattr(py, "func").unwrap();
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138 let args = ast.getattr(py, "args").unwrap();
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139 //let keywords = ast.getattr(py, "keywords").unwrap();
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140
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141 let func = parse_expr(py, func);
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142
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143 let mut arguments = vec!();
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144 for arg in args.iter(py).unwrap() {
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145 let arg = arg.unwrap();
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146 arguments.push(parse_expr(py, arg));
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147 }
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148
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149 Expr::Call(Box::new(func), arguments)
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150 } else if is_instance(&ast, &alias_type) {
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151 let name = ast.getattr(py, "name").unwrap();
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152 let asname = ast.getattr(py, "asname").unwrap();
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153
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154 let name = {
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155 let name = name.str(py).unwrap();
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156 let mut name = name.to_string(py).unwrap();
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157 name.to_mut().to_string()
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158 };
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159
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160 let asname = {
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161 let asname = asname.str(py).unwrap();
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162 let mut asname = asname.to_string(py).unwrap();
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163 let asname = asname.to_mut().to_string();
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164 if asname == "None" {
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165 "".to_string()
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166 } else {
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167 asname
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168 }
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169 };
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170
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171 Expr::Alias(name, asname)
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172 } else if is_instance(&ast, &compare_type) {
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173 let left = ast.getattr(py, "left").unwrap();
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174 let ops = ast.getattr(py, "ops").unwrap();
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175 let comparators = ast.getattr(py, "comparators").unwrap();
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176
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177 let left = parse_expr(py, left);
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178 let ops = ops.iter(py).unwrap();
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179 let comparators = comparators.iter(py).unwrap();
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180
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181 let mut new_ops = vec!();
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182 for op in ops {
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183 let op = op.unwrap();
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184 let op = parse_binop(py, op);
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185 new_ops.push(op);
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186 }
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187
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188 let mut new_comparators = vec!();
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189 for comparator in comparators {
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190 let comparator = comparator.unwrap();
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191 let comparator = parse_expr(py, comparator);
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192 new_comparators.push(comparator);
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193 }
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194
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195 Expr::Compare(Box::new(left), new_ops, new_comparators)
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196 } else {
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197 println!("Expr {}", ast);
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198 Expr::Error
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199 }
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200 }
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201
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202 fn parse_statement(py: Python, ast: PyObject) -> Statement {
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203 //Statement::FunctionDef(Expr::Name("function".to_string()), vec!(Expr::Name("a".to_string()), Expr::Name("b".to_string())), vec!())
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204 //Statement::If(Expr::BinOp(BinOp::BinEq, Box::new(Expr::Name("__name__".to_string())), Box::new(Expr::Str("__main__".to_string()))), vec!(Statement::Expr(Expr::Call(Box::new(Expr::Name("function".to_string())), vec!(Expr::Num(1), Expr::Num(2))))))
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205
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206 let builtins_module = py.import("builtins").unwrap();
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207 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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208
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209 let is_instance = |object: &PyObject, type_: &PyObject| {
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210 return isinstance.call(py, (object, type_), None).unwrap().is_true(py).unwrap();
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211 };
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212
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213 let ast_module = py.import("ast").unwrap();
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214 let ast_type = ast_module.get(py, "AST").unwrap();
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215 let function_def_type = ast_module.get(py, "FunctionDef").unwrap();
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216 let global_type = ast_module.get(py, "Global").unwrap();
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217 let assign_type = ast_module.get(py, "Assign").unwrap();
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218 let return_type = ast_module.get(py, "Return").unwrap();
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219 let import_from_type = ast_module.get(py, "ImportFrom").unwrap();
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220 let if_type = ast_module.get(py, "If").unwrap();
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221 let expr_type = ast_module.get(py, "Expr").unwrap();
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222
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223 assert!(is_instance(&ast, &ast_type));
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224
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225 /*
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226 // TODO: implement Hash for PyObject. (trivial)
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227 let map = {
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228 let fields = ast.getattr(py, "_fields").unwrap();
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229 let mut map = HashMap::new();
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230 for field in fields.iter(py).unwrap() {
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231 let field = field.unwrap();
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232 let value = ast.getattr(py, field).unwrap();
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233 map.insert(field, value);
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234 }
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235 map
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236 };
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237 */
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238
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239 if is_instance(&ast, &function_def_type) {
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240 let name = ast.getattr(py, "name").unwrap();
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241 let args = ast.getattr(py, "args").unwrap();
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242 let body = ast.getattr(py, "body").unwrap();
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243
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244 let name = {
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245 let name = name.str(py).unwrap();
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246 let mut name = name.to_string(py).unwrap();
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247 name.to_mut().to_string()
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248 };
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249
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250 let args = parse_expr_vec(py, args);
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251 /*
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252 let mut arguments = vec!();
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253 for arg in args.iter(py).unwrap() {
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254 let arg = parse_expr(py, arg.unwrap());
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255 arguments.push(arg);
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256 }
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257 */
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258
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259 let mut statements = vec!();
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260 for statement in body.iter(py).unwrap() {
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261 let statement = parse_statement(py, statement.unwrap());
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262 statements.push(statement);
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263 }
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264
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265 Statement::FunctionDef(Expr::Name(name), args, statements)
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266 } else if is_instance(&ast, &global_type) {
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267 let names = ast.getattr(py, "names").unwrap();
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268
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269 let mut globals = vec!();
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270 for name in names.iter(py).unwrap() {
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271 let name = {
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272 let name = name.unwrap().str(py).unwrap();
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273 let mut name = name.to_string(py).unwrap();
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274 name.to_mut().to_string()
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275 };
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276 globals.push(name);
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277 }
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278
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279 Statement::Global(globals)
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280 } else if is_instance(&ast, &if_type) {
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281 let test = ast.getattr(py, "test").unwrap();
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282 let body = ast.getattr(py, "body").unwrap();
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283 let orelse = ast.getattr(py, "orelse").unwrap();
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284
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285 let test = parse_expr(py, test);
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286
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287 let mut statements = vec!();
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288 for statement in body.iter(py).unwrap() {
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289 let statement = parse_statement(py, statement.unwrap());
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290 statements.push(statement);
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291 }
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292
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293 let mut orelse_ = vec!();
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294 for statement in orelse.iter(py).unwrap() {
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295 let statement = parse_statement(py, statement.unwrap());
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296 orelse_.push(statement);
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297 }
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298
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299 Statement::If(test, statements, orelse_)
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300 } else if is_instance(&ast, &assign_type) {
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301 let targets = ast.getattr(py, "targets").unwrap();
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302 let value = ast.getattr(py, "value").unwrap();
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303
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304 let mut arguments = vec!();
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305 for target in targets.iter(py).unwrap() {
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306 let target = parse_expr(py, target.unwrap());
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307 arguments.push(target);
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308 }
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309
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310 let value = parse_expr(py, value);
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311
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312 Statement::Assign(arguments, value)
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313 } else if is_instance(&ast, &import_from_type) {
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314 let module = ast.getattr(py, "module").unwrap();
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315 let names = ast.getattr(py, "names").unwrap();
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316 //let level = ast.getattr(py, "level").unwrap();
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317
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318 let module = {
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319 let module = module.str(py).unwrap();
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320 let mut module = module.to_string(py).unwrap();
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321 module.to_mut().to_string()
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322 };
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323
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324 let mut names_ = vec!();
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325 for alias in names.iter(py).unwrap() {
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326 let alias = alias.unwrap();
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327 let alias = parse_expr(py, alias);
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328 names_.push(alias);
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329 }
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330
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331 Statement::ImportFrom(module, names_)
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332 } else if is_instance(&ast, &return_type) {
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333 let value = ast.getattr(py, "value").unwrap();
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334 let value = parse_expr(py, value);
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335 Statement::Return(value)
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336 } else if is_instance(&ast, &expr_type) {
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337 let value = ast.getattr(py, "value").unwrap();
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338 let value = parse_expr(py, value);
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339 Statement::Expr(value)
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340 } else {
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341 println!("Statement {}", ast);
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342 Statement::Error
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343 }
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344 }
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345
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346 #[allow(dead_code)]
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347 pub fn convert_ast(name: String, module: &PyObject) -> Module {
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348 let gil = Python::acquire_gil();
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349 let py = gil.python();
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350
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351 let builtins_module = py.import("builtins").unwrap();
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352 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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353
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354 let ast_module = py.import("ast").unwrap();
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355 let module_type = ast_module.get(py, "Module").unwrap();
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356
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357 assert!(isinstance.call(py, (module, module_type), None).unwrap().is_true(py).unwrap());
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358
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359 let body = module.getattr(py, "body").unwrap();
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360 let mut statements = vec!();
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361 for statement in body.iter(py).unwrap() {
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362 let statement = parse_statement(py, statement.unwrap());
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363 statements.push(statement)
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364 }
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365 Module{name: name, statements: statements}
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366 }