git.delta.rocks / jrsonnet / refs/commits / 07648052cee3

1use std::{borrow::Cow, fmt::Write};23use crate::{bail, Result, State, Val};45pub trait ManifestFormat {6	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()>;7	fn manifest(&self, val: Val) -> Result<String> {8		let mut out = String::new();9		self.manifest_buf(val, &mut out)?;10		Ok(out)11	}12	/// When outputing to file, is it safe to append a trailing newline (I.e newline won't change13	/// the meaning).14	///15	/// Default implementation returns `true`16	fn file_trailing_newline(&self) -> bool {17		true18	}19}20impl<T> ManifestFormat for Box<T>21where22	T: ManifestFormat + ?Sized,23{24	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {25		let inner = &**self;26		inner.manifest_buf(val, buf)27	}28	fn file_trailing_newline(&self) -> bool {29		let inner = &**self;30		inner.file_trailing_newline()31	}32}33impl<T> ManifestFormat for &'_ T34where35	T: ManifestFormat + ?Sized,36{37	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {38		let inner = &**self;39		inner.manifest_buf(val, buf)40	}41	fn file_trailing_newline(&self) -> bool {42		let inner = &**self;43		inner.file_trailing_newline()44	}45}4647#[derive(PartialEq, Eq, Clone, Copy)]48enum JsonFormatting {49	// Applied in manifestification50	Manifest,51	/// Used for std.manifestJson52	/// Empty array/objects extends to "[\n\n]" instead of "[ ]" as in manifest53	Std,54	/// No line breaks, used in `obj+''`55	ToString,56	/// Minified json57	Minify,58}5960pub struct JsonFormat<'s> {61	padding: Cow<'s, str>,62	mtype: JsonFormatting,63	newline: &'s str,64	key_val_sep: &'s str,65	#[cfg(feature = "exp-preserve-order")]66	preserve_order: bool,67	#[cfg(feature = "exp-bigint")]68	preserve_bigints: bool,69	debug_truncate_strings: Option<usize>,70}7172impl<'s> JsonFormat<'s> {73	// Minifying format74	pub fn minify(#[cfg(feature = "exp-preserve-order")] preserve_order: bool) -> Self {75		Self {76			padding: Cow::Borrowed(""),77			mtype: JsonFormatting::Minify,78			newline: "\n",79			key_val_sep: ":",80			#[cfg(feature = "exp-preserve-order")]81			preserve_order,82			#[cfg(feature = "exp-bigint")]83			preserve_bigints: false,84			debug_truncate_strings: None,85		}86	}87	// Same format as std.toString88	pub fn std_to_string() -> Self {89		Self {90			padding: Cow::Borrowed(""),91			mtype: JsonFormatting::ToString,92			newline: "\n",93			key_val_sep: ": ",94			#[cfg(feature = "exp-preserve-order")]95			preserve_order: false,96			#[cfg(feature = "exp-bigint")]97			preserve_bigints: false,98			debug_truncate_strings: None,99		}100	}101	pub fn std_to_json(102		padding: String,103		newline: &'s str,104		key_val_sep: &'s str,105		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,106	) -> Self {107		Self {108			padding: Cow::Owned(padding),109			mtype: JsonFormatting::Std,110			newline,111			key_val_sep,112			#[cfg(feature = "exp-preserve-order")]113			preserve_order,114			#[cfg(feature = "exp-bigint")]115			preserve_bigints: false,116			debug_truncate_strings: None,117		}118	}119	// Same format as CLI manifestification120	pub fn cli(121		padding: usize,122		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,123	) -> Self {124		if padding == 0 {125			return Self::minify(126				#[cfg(feature = "exp-preserve-order")]127				preserve_order,128			);129		}130		Self {131			padding: Cow::Owned(" ".repeat(padding)),132			mtype: JsonFormatting::Manifest,133			newline: "\n",134			key_val_sep: ": ",135			#[cfg(feature = "exp-preserve-order")]136			preserve_order,137			#[cfg(feature = "exp-bigint")]138			preserve_bigints: false,139			debug_truncate_strings: None,140		}141	}142	// Same format as CLI manifestification143	pub fn debug() -> Self {144		Self {145			padding: Cow::Borrowed("   "),146			mtype: JsonFormatting::Manifest,147			newline: "\n",148			key_val_sep: ": ",149			#[cfg(feature = "exp-preserve-order")]150			preserve_order: true,151			#[cfg(feature = "exp-bigint")]152			preserve_bigints: true,153			debug_truncate_strings: Some(256),154		}155	}156}157impl Default for JsonFormat<'static> {158	fn default() -> Self {159		Self {160			padding: Cow::Borrowed("    "),161			mtype: JsonFormatting::Manifest,162			newline: "\n",163			key_val_sep: ": ",164			#[cfg(feature = "exp-preserve-order")]165			preserve_order: false,166			#[cfg(feature = "exp-bigint")]167			preserve_bigints: false,168			debug_truncate_strings: None,169		}170	}171}172173pub fn manifest_json_ex(val: &Val, options: &JsonFormat<'_>) -> Result<String> {174	let mut out = String::new();175	manifest_json_ex_buf(val, &mut out, &mut String::new(), options)?;176	Ok(out)177}178179#[allow(clippy::too_many_lines)]180fn manifest_json_ex_buf(181	val: &Val,182	buf: &mut String,183	cur_padding: &mut String,184	options: &JsonFormat<'_>,185) -> Result<()> {186	let mtype = options.mtype;187	match val {188		Val::Bool(v) => {189			if *v {190				buf.push_str("true");191			} else {192				buf.push_str("false");193			}194		}195		Val::Null => buf.push_str("null"),196		Val::Str(s) => {197			let flat = s.clone().into_flat();198			if let Some(truncate) = options.debug_truncate_strings {199				if flat.len() > truncate {200					let (start, end) = flat.split_at(truncate / 2);201					let (_, end) = end.split_at(end.len() - truncate / 2);202					escape_string_json_buf(&format!("{start}..{end}"), buf);203				} else {204					escape_string_json_buf(&flat, buf);205				}206			} else {207				escape_string_json_buf(&flat, buf);208			}209		}210		Val::Num(n) => write!(buf, "{n}").unwrap(),211		#[cfg(feature = "exp-bigint")]212		Val::BigInt(n) => {213			if options.preserve_bigints {214				write!(buf, "{n}").unwrap()215			} else {216				write!(buf, "{:?}", n.to_string()).unwrap()217			}218		}219		Val::Arr(items) => {220			buf.push('[');221			if !items.is_empty() {222				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {223					buf.push_str(options.newline);224				}225226				let old_len = cur_padding.len();227				cur_padding.push_str(&options.padding);228				for (i, item) in items.iter().enumerate() {229					if i != 0 {230						buf.push(',');231						if mtype == JsonFormatting::ToString {232							buf.push(' ');233						} else if mtype != JsonFormatting::Minify {234							buf.push_str(options.newline);235						}236					}237					buf.push_str(cur_padding);238					manifest_json_ex_buf(&item?, buf, cur_padding, options)?;239				}240				cur_padding.truncate(old_len);241242				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {243					buf.push_str(options.newline);244					buf.push_str(cur_padding);245				}246			} else if mtype == JsonFormatting::Std {247				buf.push_str(options.newline);248				buf.push_str(options.newline);249				buf.push_str(cur_padding);250			} else if mtype == JsonFormatting::ToString || mtype == JsonFormatting::Manifest {251				buf.push(' ');252			}253			buf.push(']');254		}255		Val::Obj(obj) => {256			obj.run_assertions()?;257			buf.push('{');258			let fields = obj.fields(259				#[cfg(feature = "exp-preserve-order")]260				options.preserve_order,261			);262			if !fields.is_empty() {263				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {264					buf.push_str(options.newline);265				}266267				let old_len = cur_padding.len();268				cur_padding.push_str(&options.padding);269				for (i, field) in fields.into_iter().enumerate() {270					if i != 0 {271						buf.push(',');272						if mtype == JsonFormatting::ToString {273							buf.push(' ');274						} else if mtype != JsonFormatting::Minify {275							buf.push_str(options.newline);276						}277					}278					buf.push_str(cur_padding);279					escape_string_json_buf(&field, buf);280					buf.push_str(options.key_val_sep);281					State::push_description(282						|| format!("field <{}> manifestification", field.clone()),283						|| {284							let value = obj.get(field.clone())?.unwrap();285							manifest_json_ex_buf(&value, buf, cur_padding, options)?;286							Ok(())287						},288					)?;289				}290				cur_padding.truncate(old_len);291292				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {293					buf.push_str(options.newline);294					buf.push_str(cur_padding);295				}296			} else if mtype == JsonFormatting::Std {297				buf.push_str(options.newline);298				buf.push_str(options.newline);299				buf.push_str(cur_padding);300			} else if mtype == JsonFormatting::ToString || mtype == JsonFormatting::Manifest {301				buf.push(' ');302			}303			buf.push('}');304		}305		Val::Func(_) => bail!("tried to manifest function"),306	};307	Ok(())308}309310impl ManifestFormat for JsonFormat<'_> {311	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {312		manifest_json_ex_buf(&val, buf, &mut String::new(), self)313	}314}315316pub struct ToStringFormat;317impl ManifestFormat for ToStringFormat {318	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {319		JsonFormat::std_to_string().manifest_buf(val, out)320	}321	fn file_trailing_newline(&self) -> bool {322		false323	}324}325pub struct StringFormat;326impl ManifestFormat for StringFormat {327	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {328		let Val::Str(s) = val else {329			bail!(330				"output should be string for string manifest format, got {}",331				val.value_type()332			)333		};334		write!(out, "{s}").unwrap();335		Ok(())336	}337	fn file_trailing_newline(&self) -> bool {338		false339	}340}341342pub struct YamlStreamFormat<I>(pub I);343impl<I: ManifestFormat> ManifestFormat for YamlStreamFormat<I> {344	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {345		let Val::Arr(arr) = val else {346			bail!(347				"output should be array for yaml stream format, got {}",348				val.value_type()349			)350		};351		if !arr.is_empty() {352			for v in arr.iter() {353				let v = v?;354				out.push_str("---\n");355				self.0.manifest_buf(v, out)?;356				out.push('\n');357			}358			out.push_str("...");359		}360		Ok(())361	}362}363364pub fn escape_string_json(s: &str) -> String {365	let mut buf = String::new();366	escape_string_json_buf(s, &mut buf);367	buf368}369370// Json string encoding was borrowed from https://github.com/serde-rs/json371372const BB: u8 = b'b'; // \x08373const TT: u8 = b't'; // \x09374const NN: u8 = b'n'; // \x0A375const FF: u8 = b'f'; // \x0C376const RR: u8 = b'r'; // \x0D377const QU: u8 = b'"'; // \x22378const BS: u8 = b'\\'; // \x5C379const UU: u8 = b'u'; // \x00...\x1F except the ones above380const __: u8 = 0;381382// Lookup table of escape sequences. A value of b'x' at index i means that byte383// i is escaped as "\x" in JSON. A value of 0 means that byte i is not escaped.384static ESCAPE: [u8; 256] = [385	//   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F386	UU, UU, UU, UU, UU, UU, UU, UU, BB, TT, NN, UU, FF, RR, UU, UU, // 0387	UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, // 1388	__, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2389	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3390	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4391	__, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5392	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 6393	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7394	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8395	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9396	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A397	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B398	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C399	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D400	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E401	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F402];403404pub fn escape_string_json_buf(value: &str, buf: &mut String) {405	// Safety: we only write correct utf-8 in this function406	let buf: &mut Vec<u8> = unsafe { &mut *(buf as *mut String).cast::<Vec<u8>>() };407	let bytes = value.as_bytes();408409	// Perfect for ascii strings, removes any reallocations410	buf.reserve(value.len() + 2);411412	buf.push(b'"');413414	let mut start = 0;415416	for (i, &byte) in bytes.iter().enumerate() {417		let escape = ESCAPE[byte as usize];418		if escape == __ {419			continue;420		}421422		if start < i {423			buf.extend_from_slice(&bytes[start..i]);424		}425		start = i + 1;426427		match escape {428			self::BB | self::TT | self::NN | self::FF | self::RR | self::QU | self::BS => {429				buf.extend_from_slice(&[b'\\', escape]);430			}431			self::UU => {432				static HEX_DIGITS: [u8; 16] = *b"0123456789abcdef";433				let bytes = &[434					b'\\',435					b'u',436					b'0',437					b'0',438					HEX_DIGITS[(byte >> 4) as usize],439					HEX_DIGITS[(byte & 0xF) as usize],440				];441				buf.extend_from_slice(bytes);442			}443			_ => unreachable!(),444		}445	}446447	if start == bytes.len() {448		buf.push(b'"');449		return;450	}451452	buf.extend_from_slice(&bytes[start..]);453	buf.push(b'"');454}