git.delta.rocks / jrsonnet / refs/commits / 759cfac6e9bd

1use std::{borrow::Cow, fmt::Write};23use crate::{4	error::{ErrorKind::*, Result},5	throw, State, Val,6};78pub trait ManifestFormat {9	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()>;10	fn manifest(&self, val: Val) -> Result<String> {11		let mut out = String::new();12		self.manifest_buf(val, &mut out)?;13		Ok(out)14	}15}16impl<T> ManifestFormat for Box<T>17where18	T: ManifestFormat + ?Sized,19{20	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {21		let inner = &**self;22		inner.manifest_buf(val, buf)23	}24}25impl<T> ManifestFormat for &'_ T26where27	T: ManifestFormat + ?Sized,28{29	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {30		let inner = &**self;31		inner.manifest_buf(val, buf)32	}33}3435#[derive(PartialEq, Eq, Clone, Copy)]36enum JsonFormatting {37	// Applied in manifestification38	Manifest,39	/// Used for std.manifestJson40	/// Empty array/objects extends to "[\n\n]" instead of "[ ]" as in manifest41	Std,42	/// No line breaks, used in `obj+''`43	ToString,44	/// Minified json45	Minify,46}4748pub struct JsonFormat<'s> {49	padding: Cow<'s, str>,50	mtype: JsonFormatting,51	newline: &'s str,52	key_val_sep: &'s str,53	#[cfg(feature = "exp-preserve-order")]54	preserve_order: bool,55}5657impl<'s> JsonFormat<'s> {58	// Minifying format59	pub fn minify(#[cfg(feature = "exp-preserve-order")] preserve_order: bool) -> Self {60		Self {61			padding: Cow::Borrowed(""),62			mtype: JsonFormatting::Minify,63			newline: "\n",64			key_val_sep: ":",65			#[cfg(feature = "exp-preserve-order")]66			preserve_order,67		}68	}69	// Same format as std.toString70	pub fn std_to_string() -> Self {71		Self {72			padding: Cow::Borrowed(""),73			mtype: JsonFormatting::ToString,74			newline: "\n",75			key_val_sep: ": ",76			#[cfg(feature = "exp-preserve-order")]77			preserve_order: false,78		}79	}80	pub fn std_to_json(81		padding: String,82		newline: &'s str,83		key_val_sep: &'s str,84		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,85	) -> Self {86		Self {87			padding: Cow::Owned(padding),88			mtype: JsonFormatting::Std,89			newline,90			key_val_sep,91			#[cfg(feature = "exp-preserve-order")]92			preserve_order,93		}94	}95	// Same format as CLI manifestification96	pub fn cli(97		padding: usize,98		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,99	) -> Self {100		if padding == 0 {101			return Self::minify(102				#[cfg(feature = "exp-preserve-order")]103				preserve_order,104			);105		}106		Self {107			padding: Cow::Owned(" ".repeat(padding)),108			mtype: JsonFormatting::Manifest,109			newline: "\n",110			key_val_sep: ": ",111			#[cfg(feature = "exp-preserve-order")]112			preserve_order,113		}114	}115}116impl Default for JsonFormat<'static> {117	fn default() -> Self {118		Self {119			padding: Cow::Borrowed("    "),120			mtype: JsonFormatting::Manifest,121			newline: "\n",122			key_val_sep: ": ",123			#[cfg(feature = "exp-preserve-order")]124			preserve_order: false,125		}126	}127}128129pub fn manifest_json_ex(val: &Val, options: &JsonFormat<'_>) -> Result<String> {130	let mut out = String::new();131	manifest_json_ex_buf(val, &mut out, &mut String::new(), options)?;132	Ok(out)133}134fn manifest_json_ex_buf(135	val: &Val,136	buf: &mut String,137	cur_padding: &mut String,138	options: &JsonFormat<'_>,139) -> Result<()> {140	let mtype = options.mtype;141	match val {142		Val::Bool(v) => {143			if *v {144				buf.push_str("true");145			} else {146				buf.push_str("false");147			}148		}149		Val::Null => buf.push_str("null"),150		Val::Str(s) => escape_string_json_buf(&s.clone().into_flat(), buf),151		Val::Num(n) => write!(buf, "{n}").unwrap(),152		Val::Arr(items) => {153			buf.push('[');154			if !items.is_empty() {155				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {156					buf.push_str(options.newline);157				}158159				let old_len = cur_padding.len();160				cur_padding.push_str(&options.padding);161				for (i, item) in items.iter().enumerate() {162					if i != 0 {163						buf.push(',');164						if mtype == JsonFormatting::ToString {165							buf.push(' ');166						} else if mtype != JsonFormatting::Minify {167							buf.push_str(options.newline);168						}169					}170					buf.push_str(cur_padding);171					manifest_json_ex_buf(&item?, buf, cur_padding, options)?;172				}173				cur_padding.truncate(old_len);174175				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {176					buf.push_str(options.newline);177					buf.push_str(cur_padding);178				}179			} else if mtype == JsonFormatting::Std {180				buf.push_str(options.newline);181				buf.push_str(options.newline);182				buf.push_str(cur_padding);183			} else if mtype == JsonFormatting::ToString || mtype == JsonFormatting::Manifest {184				buf.push(' ');185			}186			buf.push(']');187		}188		Val::Obj(obj) => {189			obj.run_assertions()?;190			buf.push('{');191			let fields = obj.fields(192				#[cfg(feature = "exp-preserve-order")]193				options.preserve_order,194			);195			if !fields.is_empty() {196				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {197					buf.push_str(options.newline);198				}199200				let old_len = cur_padding.len();201				cur_padding.push_str(&options.padding);202				for (i, field) in fields.into_iter().enumerate() {203					if i != 0 {204						buf.push(',');205						if mtype == JsonFormatting::ToString {206							buf.push(' ');207						} else if mtype != JsonFormatting::Minify {208							buf.push_str(options.newline);209						}210					}211					buf.push_str(cur_padding);212					escape_string_json_buf(&field, buf);213					buf.push_str(options.key_val_sep);214					State::push_description(215						|| format!("field <{}> manifestification", field.clone()),216						|| {217							let value = obj.get(field.clone())?.unwrap();218							manifest_json_ex_buf(&value, buf, cur_padding, options)?;219							Ok(())220						},221					)?;222				}223				cur_padding.truncate(old_len);224225				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {226					buf.push_str(options.newline);227					buf.push_str(cur_padding);228				}229			} else if mtype == JsonFormatting::Std {230				buf.push_str(options.newline);231				buf.push_str(options.newline);232				buf.push_str(cur_padding);233			} else if mtype == JsonFormatting::ToString || mtype == JsonFormatting::Manifest {234				buf.push(' ');235			}236			buf.push('}');237		}238		Val::Func(_) => throw!(RuntimeError("tried to manifest function".into())),239	};240	Ok(())241}242243impl ManifestFormat for JsonFormat<'_> {244	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {245		manifest_json_ex_buf(&val, buf, &mut String::new(), self)246	}247}248249pub struct ToStringFormat;250impl ManifestFormat for ToStringFormat {251	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {252		JsonFormat::std_to_string().manifest_buf(val, out)253	}254}255pub struct StringFormat;256impl ManifestFormat for StringFormat {257	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {258		let Val::Str(s) = val else {259			throw!("output should be string for string manifest format, got {}", val.value_type())260		};261		write!(out, "{s}").unwrap();262		Ok(())263	}264}265266pub struct YamlStreamFormat<I>(pub I);267impl<I: ManifestFormat> ManifestFormat for YamlStreamFormat<I> {268	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {269		let Val::Arr(arr) = val else {270			throw!("output should be array for yaml stream format, got {}", val.value_type())271		};272		if !arr.is_empty() {273			for v in arr.iter() {274				let v = v?;275				out.push_str("---\n");276				self.0.manifest_buf(v, out)?;277				out.push('\n');278			}279			out.push_str("...");280		}281		Ok(())282	}283}284285pub fn escape_string_json(s: &str) -> String {286	let mut buf = String::new();287	escape_string_json_buf(s, &mut buf);288	buf289}290291// Json string encoding was borrowed from https://github.com/serde-rs/json292293const BB: u8 = b'b'; // \x08294const TT: u8 = b't'; // \x09295const NN: u8 = b'n'; // \x0A296const FF: u8 = b'f'; // \x0C297const RR: u8 = b'r'; // \x0D298const QU: u8 = b'"'; // \x22299const BS: u8 = b'\\'; // \x5C300const UU: u8 = b'u'; // \x00...\x1F except the ones above301const __: u8 = 0;302303// Lookup table of escape sequences. A value of b'x' at index i means that byte304// i is escaped as "\x" in JSON. A value of 0 means that byte i is not escaped.305static ESCAPE: [u8; 256] = [306	//   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F307	UU, UU, UU, UU, UU, UU, UU, UU, BB, TT, NN, UU, FF, RR, UU, UU, // 0308	UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, // 1309	__, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2310	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3311	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4312	__, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5313	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 6314	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7315	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8316	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9317	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A318	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B319	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C320	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D321	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E322	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F323];324325pub fn escape_string_json_buf(value: &str, buf: &mut String) {326	// Safety: we only write correct utf-8 in this function327	let buf: &mut Vec<u8> = unsafe { &mut *(buf as *mut String).cast::<Vec<u8>>() };328	let bytes = value.as_bytes();329330	// Perfect for ascii strings, removes any reallocations331	buf.reserve(value.len() + 2);332333	buf.push(b'"');334335	let mut start = 0;336337	for (i, &byte) in bytes.iter().enumerate() {338		let escape = ESCAPE[byte as usize];339		if escape == __ {340			continue;341		}342343		if start < i {344			buf.extend_from_slice(&bytes[start..i]);345		}346		start = i + 1;347348		match escape {349			self::BB | self::TT | self::NN | self::FF | self::RR | self::QU | self::BS => {350				buf.extend_from_slice(&[b'\\', escape]);351			}352			self::UU => {353				static HEX_DIGITS: [u8; 16] = *b"0123456789abcdef";354				let bytes = &[355					b'\\',356					b'u',357					b'0',358					b'0',359					HEX_DIGITS[(byte >> 4) as usize],360					HEX_DIGITS[(byte & 0xF) as usize],361				];362				buf.extend_from_slice(bytes);363			}364			_ => unreachable!(),365		}366	}367368	if start == bytes.len() {369		buf.push(b'"');370		return;371	}372373	buf.extend_from_slice(&bytes[start..]);374	buf.push(b'"');375}