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annotate src/python_dump.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
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1 extern crate cpython;
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2
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3 use std::iter;
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4
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5 use cpython::{Python, PyObject};
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6 use cpython::ObjectProtocol; //for call method
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7
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8 fn dump(py: Python, indent: usize, ast: PyObject) -> String {
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9 let builtins_module = py.import("builtins").unwrap();
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10 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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11
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12 let is_instance = |object: &PyObject, type_: &PyObject| {
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13 return isinstance.call(py, (object, type_), None).unwrap().is_true(py).unwrap();
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14 };
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15
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16 let ast_module = py.import("ast").unwrap();
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17 let ast_type = ast_module.get(py, "AST").unwrap();
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18 let function_def_type = ast_module.get(py, "FunctionDef").unwrap();
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19 let arguments_type = ast_module.get(py, "arguments").unwrap();
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20 let arg_type = ast_module.get(py, "arg").unwrap();
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21 let assign_type = ast_module.get(py, "Assign").unwrap();
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22 let return_type = ast_module.get(py, "Return").unwrap();
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23 let bin_op_type = ast_module.get(py, "BinOp").unwrap();
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24 let name_constant_type = ast_module.get(py, "NameConstant").unwrap();
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25 let name_type = ast_module.get(py, "Name").unwrap();
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26 let num_type = ast_module.get(py, "Num").unwrap();
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27 let str_type = ast_module.get(py, "Str").unwrap();
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28 let add_type = ast_module.get(py, "Add").unwrap();
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29 let mult_type = ast_module.get(py, "Mult").unwrap();
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30 let eq_type = ast_module.get(py, "Eq").unwrap();
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31 let lt_type = ast_module.get(py, "Lt").unwrap();
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32 let if_type = ast_module.get(py, "If").unwrap();
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33 let compare_type = ast_module.get(py, "Compare").unwrap();
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34 let expr_type = ast_module.get(py, "Expr").unwrap();
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35 let call_type = ast_module.get(py, "Call").unwrap();
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36 let import_from_type = ast_module.get(py, "ImportFrom").unwrap();
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37 let alias_type = ast_module.get(py, "alias").unwrap();
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38
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39 assert!(is_instance(&ast, &ast_type));
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40
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41 /*
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42 // TODO: implement Hash for PyObject. (trivial)
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43 let map = {
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44 let fields = ast.getattr(py, "_fields").unwrap();
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45 let mut map = HashMap::new();
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46 for field in fields.iter(py).unwrap() {
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47 let field = field.unwrap();
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48 let value = ast.getattr(py, field).unwrap();
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49 map.insert(field, value);
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50 }
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51 map
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52 };
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53 */
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54
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55 if is_instance(&ast, &function_def_type) {
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56 let name = ast.getattr(py, "name").unwrap();
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57 let args = ast.getattr(py, "args").unwrap();
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58 let body = ast.getattr(py, "body").unwrap();
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59 let args = dump(py, indent, args);
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60 let declaration = format!("def {}({}):", name, args);
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61 let mut statements = vec!("".to_string());
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62 for statement in body.iter(py).unwrap() {
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63 let statement = dump(py, indent + 1, statement.unwrap());
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64 statements.push(statement);
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65 }
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66 let indent: String = iter::repeat(" ").take(indent + 1).collect();
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67 let indent = format!("\n{}", indent);
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68 let indent = indent.as_str();
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69 let body = statements.join(indent);
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70 format!("{}{}", declaration, body)
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71 } else if is_instance(&ast, &if_type) {
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72 let test = ast.getattr(py, "test").unwrap();
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73 let body = ast.getattr(py, "body").unwrap();
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74
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75 let test = dump(py, indent, test);
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76
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77 let declaration = format!("if {}:", test);
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78 let mut statements = vec!("".to_string());
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79 for statement in body.iter(py).unwrap() {
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80 let statement = dump(py, indent + 1, statement.unwrap());
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81 statements.push(statement);
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82 }
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83 let indent: String = iter::repeat(" ").take(indent + 1).collect();
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84 let indent = format!("\n{}", indent);
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85 let indent = indent.as_str();
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86 let body = statements.join(indent);
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87 format!("{}{}", declaration, body)
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88 } else if is_instance(&ast, &arguments_type) {
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89 let args_list = ast.getattr(py, "args").unwrap();
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90 let mut arguments = vec!();
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91 for arg in args_list.iter(py).unwrap() {
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92 let arg = arg.unwrap();
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93 arguments.push(dump(py, indent, arg));
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94 }
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95 format!("{}", arguments.join(", "))
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96 } else if is_instance(&ast, &arg_type) {
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97 let arg = ast.getattr(py, "arg").unwrap();
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98 format!("{}", arg)
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99 } else if is_instance(&ast, &compare_type) {
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100 let left = ast.getattr(py, "left").unwrap();
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101 let ops = ast.getattr(py, "ops").unwrap();
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102 let comparators = ast.getattr(py, "comparators").unwrap();
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103
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104 let left = dump(py, indent, left);
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105 let ops = ops.iter(py).unwrap();
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106 let comparators = comparators.iter(py).unwrap();
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107
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108 let mut comparisons = vec!();
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109 for (op, comparator) in ops.zip(comparators) {
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110 let op = op.unwrap();
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111 let comparator = comparator.unwrap();
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112
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113 let op = dump(py, indent, op);
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114 let comparator = dump(py, indent, comparator);
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115
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116 comparisons.push(format!("{} {}", op, comparator));
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117 }
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118 format!("{} {}", left, comparisons.join(" "))
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119 } else if is_instance(&ast, &assign_type) {
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120 let targets = ast.getattr(py, "targets").unwrap();
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121 let value = ast.getattr(py, "value").unwrap();
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122 let mut cibles = vec!();
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123 for target in targets.iter(py).unwrap() {
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124 let target = target.unwrap();
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125 let target = dump(py, indent, target);
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126 cibles.push(target.to_string());
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127 }
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128 let value = dump(py, indent, value);
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129 format!("{} = {}", cibles.join(", "), value)
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130 } else if is_instance(&ast, &return_type) {
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131 let value = ast.getattr(py, "value").unwrap();
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132 let value = dump(py, indent, value);
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133 format!("return {}", value)
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134 } else if is_instance(&ast, &bin_op_type) {
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135 let left = ast.getattr(py, "left").unwrap();
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136 let op = ast.getattr(py, "op").unwrap();
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137 let right = ast.getattr(py, "right").unwrap();
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138
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139 let left = dump(py, indent, left);
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140 let op = dump(py, indent, op);
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141 let right = dump(py, indent, right);
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142
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143 format!("{} {} {}", left, op, right)
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144 } else if is_instance(&ast, &name_type) {
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145 let id = ast.getattr(py, "id").unwrap();
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146 format!("{}", id)
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147 } else if is_instance(&ast, &name_constant_type) {
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148 let value = ast.getattr(py, "value").unwrap();
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149 format!("{}", value)
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150 } else if is_instance(&ast, &expr_type) {
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151 let value = ast.getattr(py, "value").unwrap();
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152 let value = dump(py, indent, value);
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153 format!("{}", value)
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154 } else if is_instance(&ast, &call_type) {
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155 let func = ast.getattr(py, "func").unwrap();
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156 let args = ast.getattr(py, "args").unwrap();
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157 //let keywords = ast.getattr(py, "keywords").unwrap();
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158
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159 let func = dump(py, indent, func);
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160
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161 let mut arguments = vec!();
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162 for arg in args.iter(py).unwrap() {
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163 let arg = arg.unwrap();
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164 arguments.push(dump(py, indent, arg));
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165 }
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166
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167 format!("{}({})", func, arguments.join(", "))
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168 } else if is_instance(&ast, &import_from_type) {
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169 let module = ast.getattr(py, "module").unwrap();
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170 let names = ast.getattr(py, "names").unwrap();
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171 //let level = ast.getattr(py, "level").unwrap();
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172
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173 let mut arguments = vec!();
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174 for name in names.iter(py).unwrap() {
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175 let name = name.unwrap();
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176 arguments.push(dump(py, indent, name));
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177 }
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178
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179 format!("from {} import {}", module, arguments.join(", "))
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180 } else if is_instance(&ast, &alias_type) {
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181 let name = ast.getattr(py, "name").unwrap();
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182 let asname = ast.getattr(py, "asname").unwrap();
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183
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184 let name = {
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185 let name = name.str(py).unwrap();
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186 let mut name = name.to_string(py).unwrap();
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187 name.to_mut().to_string()
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188 };
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189
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190 let asname = {
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191 let asname = asname.str(py).unwrap();
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192 let mut asname = asname.to_string(py).unwrap();
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193 asname.to_mut().to_string()
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194 };
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195
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196 if asname == "None" {
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197 format!("{}", name)
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198 } else {
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199 format!("{} as {}", name, asname)
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200 }
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201 } else if is_instance(&ast, &num_type) {
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202 let n = ast.getattr(py, "n").unwrap();
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203 format!("{}", n)
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204 } else if is_instance(&ast, &str_type) {
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205 let s = ast.getattr(py, "s").unwrap();
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206 format!("\"{}\"", s)
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207 } else if is_instance(&ast, &add_type) {
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208 format!("+")
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209 } else if is_instance(&ast, &mult_type) {
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210 format!("*")
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211 } else if is_instance(&ast, &eq_type) {
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212 format!("==")
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213 } else if is_instance(&ast, &lt_type) {
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214 format!("<")
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215 } else {
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216 format!("unknown {}", ast)
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217 }
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218 }
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219
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220 #[allow(dead_code)]
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221 pub fn dump_module(module: &PyObject) {
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222 let gil = Python::acquire_gil();
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223 let py = gil.python();
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224
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225 let builtins_module = py.import("builtins").unwrap();
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226 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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227
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228 let ast_module = py.import("ast").unwrap();
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229 let module_type = ast_module.get(py, "Module").unwrap();
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230
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231 assert!(isinstance.call(py, (module, module_type), None).unwrap().is_true(py).unwrap());
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232
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233 let body = module.getattr(py, "body").unwrap();
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234 for statement in body.iter(py).unwrap() {
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235 println!("{}", dump(py, 0, statement.unwrap()));
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236 }
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237 }