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Factorise conversion of Python str into Rust String.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 31 May 2016 00:52:00 +0100
parents 211b0df72e64
children 5fc7c2790d8c
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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::iter;
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4
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5 impl BinOp {
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6 fn to_string(&self) -> &'static str {
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7 match *self {
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8 BinOp::BinAdd => "+",
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9 BinOp::BinMult => "*",
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10 BinOp::BinEq => "==",
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11 BinOp::BinLt => "<",
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12 BinOp::Error => "BinOp::Error"
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13 }
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14 }
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15 }
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16
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17 impl Expr {
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18 fn to_string(&self) -> String {
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19 match self.clone() {
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20 Expr::BinOp(a, op, b) => format!("{} {} {}", a.to_string(), op.to_string(), b.to_string()),
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21 Expr::Compare(left, ops, comparators) => format!("{} {}", left.to_string(), {
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22 let mut arguments = vec!();
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23
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24 // XXX: wrong order!
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25 for op in ops {
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26 arguments.push(op.to_string().to_string())
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27 }
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28 for comparator in comparators {
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29 arguments.push(comparator.to_string())
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30 }
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31 /*
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32 for (op, comparator) in ops.zip(comparators) {
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33 let op = op.unwrap();
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34 let comparator = comparator.unwrap();
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35 arguments.push(format!("{} {}", op.to_string(), comparator.to_string()))
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36 }
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37 */
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38
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39 arguments.join(" ")
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40 }),
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41 Expr::Call(func, args) => format!("{}({})", func.to_string(), {
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42 let mut arguments = vec!();
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43 for arg in args {
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44 arguments.push(arg.to_string());
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45 }
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46 arguments.join(", ")
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47 }),
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48 Expr::Alias(name, asname) => {
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49 match asname {
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50 None => format!("{}", name),
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51 Some(asname) => format!("{} as {}", name, asname)
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52 }
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53 }
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54 Expr::Name(name) => format!("{}", name),
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55 Expr::NameConstant(name) => format!("{}", name),
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56 Expr::Str(s) => format!("\"{}\"", s),
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57 Expr::Num(n) => format!("{}", n),
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58 Expr::Error => "Expr::Error".to_string()
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59 }
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60 }
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61 }
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62
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63 fn make_indent(indent: usize) -> String {
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64 let indent: String = iter::repeat(" ").take(indent).collect();
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65 indent
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66 }
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67
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68 impl Statement {
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69 fn to_string(&self, indent: usize) -> String {
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70 match self.clone() {
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71 Statement::FunctionDef(Expr::Name(name), arguments, body) => format!("{}def {}({}):\n{}", make_indent(indent), name, {
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72 let mut args = vec!();
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73 for arg in arguments {
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74 args.push(arg.to_string());
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75 }
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76 args.join(", ")
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77 }, {
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78 let mut statements = vec!();
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79 for statement in body {
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80 statements.push(statement.to_string(indent + 1));
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81 }
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82 statements.join("\n")
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83 }),
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84 Statement::FunctionDef(_, _, _) => format!("error!"),
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85 Statement::Global(names) => format!("{}global {}", make_indent(indent), names.join(", ")),
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86 Statement::If(test, body, orelse) => format!("{}if {}:\n{}", make_indent(indent), test.to_string(), {
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87 let mut statements = vec!();
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88 for arg in body {
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89 statements.push(arg.to_string(indent + 1));
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90 }
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91
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92 let mut orelse_ = vec!();
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93 for arg in orelse {
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94 orelse_.push(arg.to_string(indent + 1));
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95 }
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96
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97 if orelse_.is_empty() {
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98 statements.join("\n")
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99 } else {
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100 format!("{}\n{}else:\n{}", statements.join("\n"), make_indent(indent), orelse_.join("\n"))
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101 }
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102 }),
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103 Statement::Assign(targets, value) => format!("{}{} = {}", make_indent(indent), {
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104 let mut exprs = vec!();
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105 for target in targets {
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106 exprs.push(target.to_string());
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107 }
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108 exprs.join(", ")
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109 }, value.to_string()),
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110 Statement::Return(expr) => format!("{}return {}", make_indent(indent), expr.to_string()),
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111 Statement::ImportFrom(module, names) => format!("{}from {} import {}", make_indent(indent), module.to_string(), {
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112 let mut exprs = vec!();
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113 for alias in names.iter() {
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114 let alias = alias.to_string();
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115 exprs.push(alias);
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116 }
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117 exprs.join(", ")
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118 }),
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119 Statement::Expr(expr) => format!("{}{}", make_indent(indent), expr.to_string()),
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120 Statement::Error => format!("{}Statement::Error", make_indent(indent))
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121 }
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122 }
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123 }
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124
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125 #[allow(dead_code)]
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126 pub fn dump_ast(ast: &Module) {
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127 for statement in &ast.statements {
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128 println!("{}", statement.to_string(0));
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129 }
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130 }