routinator 0.10.2

An RPKI relying party software.
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//! Building JSON on the fly.

use std::fmt;
use std::fmt::Write;


//------------ JsonBuilder ---------------------------------------------------

/// A helper type for building a JSON-encoded string on the fly.
///
/// Note that the builder only supports strings without control characters.
pub struct JsonBuilder<'a> {
    target: &'a mut String,
    indent: usize,
    empty: bool,
}

impl JsonBuilder<'static> {
    pub fn build<F: FnOnce(&mut JsonBuilder)>(op: F) -> String {
        let mut target = String::new();
        JsonBuilder {
            target: &mut target, indent: 0, empty: true
        }.array_object(op);
        target
    }
}

impl<'a> JsonBuilder<'a> {
    pub fn member_object<F: FnOnce(&mut JsonBuilder)>(
        &mut self, key: impl fmt::Display, op: F
    ) {
        self.append_key(key);
        self.target.push_str("{\n");
        op(&mut JsonBuilder {
            target: self.target,
            indent: self.indent + 1,
            empty: true
        });
        self.target.push('\n');
        self.append_indent();
        self.target.push('}');
    }

    pub fn member_array<F: FnOnce(&mut JsonBuilder)>(
        &mut self, key: impl fmt::Display, op: F
    ) {
        self.append_key(key);
        self.target.push_str("[\n");
        op(&mut JsonBuilder {
            target: self.target,
            indent: self.indent + 1,
            empty: true
        });
        self.target.push('\n');
        self.append_indent();
        self.target.push(']');
    }

    pub fn member_str(
        &mut self, key: impl fmt::Display, value: impl fmt::Display
    ) {
        self.append_key(key);
        self.target.push('"');
        write!(JsonString { target: self.target }, "{}", value).unwrap();
        self.target.push('"');
    }

    pub fn member_raw(
        &mut self, key: impl fmt::Display, value: impl fmt::Display
    ) {
        self.append_key(key);
        write!(JsonString { target: self.target }, "{}", value).unwrap();
    }

    pub fn array_object<F: FnOnce(&mut JsonBuilder)>(&mut self, op: F) {
        self.append_array_head();
        self.append_indent();
        self.target.push_str("{\n");
        op(&mut JsonBuilder {
            target: self.target,
            indent: self.indent + 1,
            empty: true
        });
        self.target.push('\n');
        self.append_indent();
        self.target.push('}');
    }

    pub fn array_array<F: FnOnce(&mut JsonBuilder)>(&mut self, op: F) {
        self.append_array_head();
        self.append_indent();
        self.target.push_str("[\n");
        op(&mut JsonBuilder {
            target: self.target,
            indent: self.indent + 1,
            empty: true
        });
        self.target.push('\n');
        self.append_indent();
        self.target.push(']');
    }

    pub fn array_str(&mut self, value: impl fmt::Display) {
        self.append_array_head();
        self.append_indent();
        self.target.push('"');
        write!(JsonString { target: self.target }, "{}", value).unwrap();
        self.target.push('"');
    }

    pub fn array_raw(&mut self, value: impl fmt::Display) {
        self.append_array_head();
        self.append_indent();
        write!(JsonString { target: self.target }, "{}", value).unwrap();
    }

    fn append_key(&mut self, key: impl fmt::Display) {
        if self.empty {
            self.empty = false
        }
        else {
            self.target.push_str(",\n");
        }
        self.append_indent();
        self.target.push('"');
        write!(JsonString { target: self.target }, "{}", key).unwrap();
        self.target.push('"');
        self.target.push_str(": ");
    }

    fn append_array_head(&mut self) {
        if self.empty {
            self.empty = false
        }
        else {
            self.target.push_str(",\n");
        }
    }

    fn append_indent(&mut self) {
        for _ in 0..self.indent {
            self.target.push_str("   ");
        }
    }
}


//------------ JsonString ----------------------------------------------------

struct JsonString<'a> {
    target: &'a mut String,
}

impl<'a> fmt::Write for JsonString<'a> {
    fn write_str(&mut self, mut s: &str) -> Result<(), fmt::Error> {
        while let Some(idx) = s.find(|ch| ch == '"' || ch == '\\') {
            self.target.push_str(&s[..idx]);
            self.target.push('\\');
            self.target.push(char::from(s.as_bytes()[idx]));
            s = &s[idx + 1..];
        }
        self.target.push_str(s);
        Ok(())
    }
}