Mercurial > python-compiler.rs

annotate src/ast_type.rs @ 5:ddf372373a77

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Add ast.For, ast.UnaryOp, and Sub and Div to ast.BinOp.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 31 May 2016 04:15:00 +0100
parents f27a4aee9dfa
children 6f2bf13f4cb5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 use python_ast::{Module, Statement, Expr, BinOp};
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2
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3 use std::collections::HashMap;
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4
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5 #[derive(Clone, Debug, PartialEq, Eq)]
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6 enum Type {
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7 Top(usize),
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8 Unit,
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9 Bool,
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10 Int,
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11 Str,
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12 Function(Vec<Type>, Vec<Type>),
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13 Bottom
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14 }
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15
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16 struct TypeVariable {
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17 id: usize,
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18 instance: Box<TypeVariable>,
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19 }
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20
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21 trait Visitor<T> {
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22 fn visit_module(&mut self, module: Module) -> T;
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23 fn visit_statement(&mut self, statement: Statement) -> T;
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24 fn visit_expr(&mut self, expr: Expr) -> T;
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25 }
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26
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27 struct Typing {
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28 environment: Vec<HashMap<String, Type>>,
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29 next_id: usize,
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30 }
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31
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32 impl Visitor<Type> for Typing {
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33 fn visit_module(&mut self, module: Module) -> Type {
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34 println!("{:?}", self.environment);
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35 for statement in module.statements {
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36 self.visit_statement(statement);
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37 }
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38 println!("{:?}", self.environment);
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39 Type::Bottom
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40 }
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41
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42 fn visit_statement(&mut self, statement: Statement) -> Type {
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43 match statement {
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44 Statement::ClassDef(name, classes, body) => {
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45 Type::Bottom
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46 },
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47 Statement::FunctionDef(name, arguments, body) => {
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48 let mut env = self.environment.pop().unwrap();
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49 self.environment.push(env.clone());
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50
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51 let nb_args = arguments.len();
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52 for expr in arguments {
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53 let type_ = self.visit_expr(expr.clone());
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54 let name = match expr {
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55 Expr::Name(name) => name,
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56 _ => panic!()
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57 };
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58 env.insert(name.clone(), type_.clone());
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59 }
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60 self.environment.push(env);
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61
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62 for statement in body {
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63 self.visit_statement(statement);
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64 }
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65 self.environment.pop();
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66
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67 let mut types = Vec::with_capacity(nb_args);
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68 for _ in 0..nb_args {
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69 self.next_id += 1;
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70 types.push(Type::Top(self.next_id));
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71 }
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72 Type::Bottom
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73 },
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74 Statement::Global(_) => {
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75 Type::Bottom
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76 },
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77 Statement::If(test, body, orelse) => {
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78 self.visit_expr(test);
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79 for statement in body {
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80 self.visit_statement(statement);
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81 }
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82 for statement in orelse {
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83 self.visit_statement(statement);
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84 }
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85 Type::Bottom
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86 },
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87 Statement::For(target, iter, body, orelse) => {
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88 self.visit_expr(target);
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89 self.visit_expr(iter);
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90 for statement in body {
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91 self.visit_statement(statement);
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92 }
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93 for statement in orelse {
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94 self.visit_statement(statement);
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95 }
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96 Type::Bottom
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97 },
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98 Statement::Assign(targets, value) => {
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99 let type_ = self.visit_expr(value);
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100 if targets.len() != 1 {
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101 panic!();
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102 }
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103 println!("{:?}", self.environment.clone());
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104 let mut env = self.environment.pop().unwrap();
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105 for target in targets {
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106 let name = match target {
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107 Expr::Name(name) => name,
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108 _ => panic!()
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109 };
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110 println!("{} => {:?}", name, type_);
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111 env.insert(name, type_.clone());
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112 }
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113 self.environment.push(env);
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114 println!("{:?}", self.environment.clone());
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115 Type::Bottom
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116 },
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117 Statement::Return(expr) => {
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118 self.visit_expr(expr)
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119 },
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120 Statement::ImportFrom(module, names) => {
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121 for alias in names {
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122 self.visit_expr(alias);
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123 }
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124 Type::Bottom
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125 },
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126 Statement::Expr(expr) => {
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127 self.visit_expr(expr)
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128 },
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129 Statement::Error => {
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130 println!("Statement::Error");
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131 panic!()
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132 },
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133 }
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134 }
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135
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136 fn visit_expr(&mut self, expr: Expr) -> Type {
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137 let expr_str = format!("{:?}", expr);
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138 let type_ = match expr {
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139 Expr::UnaryOp(op, operand) => {
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140 let type_operand = self.visit_expr(*operand);
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141 type_operand
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142 },
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143 Expr::BinOp(left, op, right) => {
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144 let type_left = self.visit_expr(*left);
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145 let type_right = self.visit_expr(*right);
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146
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147 if op == BinOp::BinMult && type_left == Type::Str && type_right == Type::Int {
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148 return Type::Str;
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149 }
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150
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151 if type_left != type_right {
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152 return Type::Bottom;
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153 }
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154 if op == BinOp::BinAdd || op == BinOp::BinMult {
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155 if type_left == Type::Int {
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156 Type::Int
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157 } else if type_left == Type::Str {
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158 Type::Str
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159 } else {
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160 Type::Bottom
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161 }
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162 } else if op == BinOp::BinEq || op == BinOp::BinLt {
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163 Type::Bool
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164 } else {
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165 Type::Bottom
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166 }
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167 },
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168 Expr::Compare(_, _, _) => Type::Bool,
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169 Expr::Call(func, args) => {
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170 let func = *func;
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171 let func = match func {
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172 Expr::Name(arg) => arg,
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173 _ => panic!()
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174 };
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175 let mut types = vec!();
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176 for expr in args {
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177 let type_ = self.visit_expr(expr);
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178 types.push(type_);
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179 }
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180 println!("types: {:?}", types);
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181 let env = match self.environment.pop() {
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182 Some(env) => env,
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183 None => return Type::Bottom
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184 };
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185 if env.contains_key(&func) {
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186 let value = env.get(&func).unwrap().clone();
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187 self.environment.push(env);
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188 value
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189 } else {
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190 self.environment.push(env);
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191 Type::Bottom
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192 }
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193 },
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194 Expr::Alias(_, _) => Type::Bottom,
4
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195 Expr::Attribute(lhs, rhs) => {
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196 let type_left = self.visit_expr(*lhs);
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197 println!("coucou {:?}", type_left);
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198 Type::Bottom
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199 },
0
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200 Expr::Name(id) => {
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201 let env = match self.environment.pop() {
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202 Some(env) => env,
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203 None => return Type::Bottom
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204 };
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205 if env.contains_key(&id) {
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206 let value = env.get(&id).unwrap().clone();
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207 self.environment.push(env);
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208 value
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209 } else {
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210 self.environment.push(env);
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211 self.next_id += 1;
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212 Type::Top(self.next_id)
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213 }
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214 },
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215 Expr::NameConstant(value) => {
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216 if value == "True" || value == "False" {
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217 Type::Bool
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218 } else if value == "None" {
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219 Type::Unit
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220 } else {
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221 Type::Bottom
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222 }
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223 },
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224 Expr::Str(_) => Type::Str,
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225 Expr::Num(_) => Type::Int,
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226 Expr::Error => {
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227 println!("Expr::Error");
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228 panic!()
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229 }
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230 };
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231 println!("{} => {:?}", expr_str, type_);
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232 type_
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233 }
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234 }
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235
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236 #[allow(dead_code)]
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237 pub fn type_ast(ast: Module) {
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238 let mut environment = HashMap::new();
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239 environment.insert("int".to_string(), Type::Int);
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240 environment.insert("__name__".to_string(), Type::Str);
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241 environment.insert("print".to_string(), Type::Unit);
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242 let mut typing = Typing{environment: vec!(environment), next_id: 0};
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243 typing.visit_module(ast);
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244 }