Mercurial > python-compiler.rs

annotate src/python_dump.rs @ 3:326d7f2a94d4

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Remove useless abstraction of function name as Expr.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 31 May 2016 02:36:24 +0100
parents b90e49ab734b
children ddf372373a77
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 fn get_str(py: Python, object: PyObject) -> String {
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56 let pystring = object.str(py).unwrap();
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57 let mut string = pystring.to_string(py).unwrap();
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58 string.to_mut().to_string()
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59 }
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60
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61 if is_instance(&ast, &function_def_type) {
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62 let name = ast.getattr(py, "name").unwrap();
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63 let args = ast.getattr(py, "args").unwrap();
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64 let body = ast.getattr(py, "body").unwrap();
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65 let args = dump(py, indent, args);
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66 let declaration = format!("def {}({}):", name, args);
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67 let mut statements = vec!("".to_string());
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68 for statement in body.iter(py).unwrap() {
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69 let statement = dump(py, indent + 1, statement.unwrap());
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70 statements.push(statement);
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71 }
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72 let indent: String = iter::repeat(" ").take(indent + 1).collect();
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73 let indent = format!("\n{}", indent);
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74 let indent = indent.as_str();
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75 let body = statements.join(indent);
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76 format!("{}{}", declaration, body)
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77 } else if is_instance(&ast, &if_type) {
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78 let test = ast.getattr(py, "test").unwrap();
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79 let body = ast.getattr(py, "body").unwrap();
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80
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81 let test = dump(py, indent, test);
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82
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83 let declaration = format!("if {}:", test);
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84 let mut statements = vec!("".to_string());
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85 for statement in body.iter(py).unwrap() {
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86 let statement = dump(py, indent + 1, statement.unwrap());
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87 statements.push(statement);
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88 }
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89 let indent: String = iter::repeat(" ").take(indent + 1).collect();
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90 let indent = format!("\n{}", indent);
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91 let indent = indent.as_str();
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92 let body = statements.join(indent);
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93 format!("{}{}", declaration, body)
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94 } else if is_instance(&ast, &arguments_type) {
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95 let args_list = ast.getattr(py, "args").unwrap();
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96 let mut arguments = vec!();
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97 for arg in args_list.iter(py).unwrap() {
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98 let arg = arg.unwrap();
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99 arguments.push(dump(py, indent, arg));
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100 }
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101 format!("{}", arguments.join(", "))
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102 } else if is_instance(&ast, &arg_type) {
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103 let arg = ast.getattr(py, "arg").unwrap();
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104 format!("{}", arg)
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105 } else if is_instance(&ast, &compare_type) {
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106 let left = ast.getattr(py, "left").unwrap();
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107 let ops = ast.getattr(py, "ops").unwrap();
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108 let comparators = ast.getattr(py, "comparators").unwrap();
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109
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110 let left = dump(py, indent, left);
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111 let ops = ops.iter(py).unwrap();
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112 let comparators = comparators.iter(py).unwrap();
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113
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114 let mut comparisons = vec!();
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115 for (op, comparator) in ops.zip(comparators) {
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116 let op = op.unwrap();
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117 let comparator = comparator.unwrap();
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118
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119 let op = dump(py, indent, op);
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120 let comparator = dump(py, indent, comparator);
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121
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122 comparisons.push(format!("{} {}", op, comparator));
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123 }
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124 format!("{} {}", left, comparisons.join(" "))
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125 } else if is_instance(&ast, &assign_type) {
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126 let targets = ast.getattr(py, "targets").unwrap();
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127 let value = ast.getattr(py, "value").unwrap();
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128 let mut cibles = vec!();
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129 for target in targets.iter(py).unwrap() {
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130 let target = target.unwrap();
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131 let target = dump(py, indent, target);
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132 cibles.push(target.to_string());
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133 }
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134 let value = dump(py, indent, value);
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135 format!("{} = {}", cibles.join(", "), value)
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136 } else if is_instance(&ast, &return_type) {
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137 let value = ast.getattr(py, "value").unwrap();
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138 let value = dump(py, indent, value);
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139 format!("return {}", value)
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140 } else if is_instance(&ast, &bin_op_type) {
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141 let left = ast.getattr(py, "left").unwrap();
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142 let op = ast.getattr(py, "op").unwrap();
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143 let right = ast.getattr(py, "right").unwrap();
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144
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145 let left = dump(py, indent, left);
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146 let op = dump(py, indent, op);
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147 let right = dump(py, indent, right);
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148
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149 format!("{} {} {}", left, op, right)
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150 } else if is_instance(&ast, &name_type) {
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151 let id = ast.getattr(py, "id").unwrap();
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152 format!("{}", id)
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153 } else if is_instance(&ast, &name_constant_type) {
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154 let value = ast.getattr(py, "value").unwrap();
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155 format!("{}", value)
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156 } else if is_instance(&ast, &expr_type) {
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157 let value = ast.getattr(py, "value").unwrap();
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158 let value = dump(py, indent, value);
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159 format!("{}", value)
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160 } else if is_instance(&ast, &call_type) {
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161 let func = ast.getattr(py, "func").unwrap();
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162 let args = ast.getattr(py, "args").unwrap();
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163 //let keywords = ast.getattr(py, "keywords").unwrap();
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164
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165 let func = dump(py, indent, func);
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166
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167 let mut arguments = vec!();
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168 for arg in args.iter(py).unwrap() {
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169 let arg = arg.unwrap();
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170 arguments.push(dump(py, indent, arg));
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171 }
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172
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173 format!("{}({})", func, arguments.join(", "))
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174 } else if is_instance(&ast, &import_from_type) {
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175 let module = ast.getattr(py, "module").unwrap();
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176 let names = ast.getattr(py, "names").unwrap();
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177 //let level = ast.getattr(py, "level").unwrap();
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178
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179 let mut arguments = vec!();
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180 for name in names.iter(py).unwrap() {
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181 let name = name.unwrap();
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182 arguments.push(dump(py, indent, name));
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183 }
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184
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185 format!("from {} import {}", module, arguments.join(", "))
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186 } else if is_instance(&ast, &alias_type) {
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187 let name = ast.getattr(py, "name").unwrap();
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188 let asname = ast.getattr(py, "asname").unwrap();
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189
1
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190 let name = get_str(py, name);
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191 let asname = get_str(py, asname);
0
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192
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193 if asname == "None" {
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194 format!("{}", name)
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195 } else {
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196 format!("{} as {}", name, asname)
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197 }
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198 } else if is_instance(&ast, &num_type) {
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199 let n = ast.getattr(py, "n").unwrap();
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200 format!("{}", n)
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201 } else if is_instance(&ast, &str_type) {
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202 let s = ast.getattr(py, "s").unwrap();
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203 format!("\"{}\"", s)
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204 } else if is_instance(&ast, &add_type) {
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205 format!("+")
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206 } else if is_instance(&ast, &mult_type) {
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207 format!("*")
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208 } else if is_instance(&ast, &eq_type) {
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209 format!("==")
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210 } else if is_instance(&ast, &lt_type) {
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211 format!("<")
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212 } else {
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213 format!("unknown {}", ast)
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214 }
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215 }
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216
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217 #[allow(dead_code)]
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218 pub fn dump_module(module: &PyObject) {
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219 let gil = Python::acquire_gil();
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220 let py = gil.python();
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221
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222 let builtins_module = py.import("builtins").unwrap();
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223 let isinstance = builtins_module.get(py, "isinstance").unwrap();
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224
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225 let ast_module = py.import("ast").unwrap();
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226 let module_type = ast_module.get(py, "Module").unwrap();
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227
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228 assert!(isinstance.call(py, (module, module_type), None).unwrap().is_true(py).unwrap());
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229
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230 let body = module.getattr(py, "body").unwrap();
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231 for statement in body.iter(py).unwrap() {
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232 println!("{}", dump(py, 0, statement.unwrap()));
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233 }
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234 }