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use std::cmp::max;
#[derive(Debug)]
pub struct CodeBuilder {
code: String,
indent_level: i32,
indent_size: i32,
}
impl CodeBuilder {
pub fn add_line<S>(&mut self, line: S)
where S: AsRef<str>
{
let line = line.as_ref().trim();
let indent_change = (line.matches("{").count() as i32) - (line.matches("}").count() as i32);
let new_indent_level = max(0, self.indent_level + indent_change);
let this_line_indent = if line.starts_with("}") || line.ends_with(":") {
self.indent_level - 1
} else {
self.indent_level
};
for _ in 0..this_line_indent * self.indent_size {
self.code.push(' ');
}
self.code.push_str(line);
self.code.push_str("\n");
self.indent_level = new_indent_level;
}
pub fn add<S>(&mut self, code: S)
where S: AsRef<str>
{
for l in code.as_ref().lines() {
self.add_line(l);
}
}
pub fn add_code(&mut self, builder: &CodeBuilder) {
self.code.push_str(builder.code.as_ref());
}
pub fn result(&self) -> &str {
self.code.as_str()
}
pub fn new() -> CodeBuilder {
CodeBuilder::with_indent_size(2)
}
pub fn with_indent_size(indent_size: i32) -> CodeBuilder {
CodeBuilder {
code: String::new(),
indent_level: 0,
indent_size: indent_size,
}
}
pub fn format<S>(indent_size: i32, code: S) -> String
where S: AsRef<str>
{
let mut c = CodeBuilder::with_indent_size(indent_size);
c.add(code);
c.code
}
}
#[test]
fn code_builder_basic() {
let input = "
class A {
blahblah;
}";
let expected = "
class A {
blahblah;
}
";
assert_eq!(CodeBuilder::format(2, input), expected);
let input = "
class A {
if (c) {
duh
}
}";
let expected = "
class A {
if (c) {
duh
}
}
";
assert_eq!(CodeBuilder::format(2, input), expected);
let input = "
class A {
if (c) { duh }
}";
let expected = "
class A {
if (c) { duh }
}
";
assert_eq!(CodeBuilder::format(2, input), expected);
let input = "
class A {
if (c) { duh }
myLabel:
blah
}";
let expected = "
class A {
if (c) { duh }
myLabel:
blah
}
";
assert_eq!(CodeBuilder::format(2, input), expected);
}