git.delta.rocks / jrsonnet / refs/commits / f319c3545168

1use std::{borrow::Cow, fmt::Write, ptr};23use crate::{bail, Result, ResultExt, 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						.with_description(|| format!("elem <{i}> manifestification"))?;240				}241				cur_padding.truncate(old_len);242243				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {244					buf.push_str(options.newline);245					buf.push_str(cur_padding);246				}247			} else if mtype == JsonFormatting::Std {248				buf.push_str(options.newline);249				buf.push_str(options.newline);250				buf.push_str(cur_padding);251			} else if mtype == JsonFormatting::ToString || mtype == JsonFormatting::Manifest {252				buf.push(' ');253			}254			buf.push(']');255		}256		Val::Obj(obj) => {257			obj.run_assertions()?;258			buf.push('{');259			let fields = obj.fields(260				#[cfg(feature = "exp-preserve-order")]261				options.preserve_order,262			);263			if !fields.is_empty() {264				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {265					buf.push_str(options.newline);266				}267268				let old_len = cur_padding.len();269				cur_padding.push_str(&options.padding);270				for (i, field) in fields.into_iter().enumerate() {271					if i != 0 {272						buf.push(',');273						if mtype == JsonFormatting::ToString {274							buf.push(' ');275						} else if mtype != JsonFormatting::Minify {276							buf.push_str(options.newline);277						}278					}279					buf.push_str(cur_padding);280					escape_string_json_buf(&field, buf);281					buf.push_str(options.key_val_sep);282					State::push_description(283						|| format!("field <{}> manifestification", field.clone()),284						|| {285							let value = obj.get(field.clone())?.unwrap();286							manifest_json_ex_buf(&value, buf, cur_padding, options)?;287							Ok(())288						},289					)?;290				}291				cur_padding.truncate(old_len);292293				if mtype != JsonFormatting::ToString && mtype != JsonFormatting::Minify {294					buf.push_str(options.newline);295					buf.push_str(cur_padding);296				}297			} else if mtype == JsonFormatting::Std {298				buf.push_str(options.newline);299				buf.push_str(options.newline);300				buf.push_str(cur_padding);301			} else if mtype == JsonFormatting::ToString || mtype == JsonFormatting::Manifest {302				buf.push(' ');303			}304			buf.push('}');305		}306		Val::Func(_) => bail!("tried to manifest function"),307	};308	Ok(())309}310311impl ManifestFormat for JsonFormat<'_> {312	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {313		manifest_json_ex_buf(&val, buf, &mut String::new(), self)314	}315}316317pub struct ToStringFormat;318impl ManifestFormat for ToStringFormat {319	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {320		JsonFormat::std_to_string().manifest_buf(val, out)321	}322	fn file_trailing_newline(&self) -> bool {323		false324	}325}326pub struct StringFormat;327impl ManifestFormat for StringFormat {328	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {329		let Val::Str(s) = val else {330			bail!(331				"output should be string for string manifest format, got {}",332				val.value_type()333			)334		};335		write!(out, "{s}").unwrap();336		Ok(())337	}338	fn file_trailing_newline(&self) -> bool {339		false340	}341}342343pub struct YamlStreamFormat<I>(pub I);344impl<I: ManifestFormat> ManifestFormat for YamlStreamFormat<I> {345	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {346		let Val::Arr(arr) = val else {347			bail!(348				"output should be array for yaml stream format, got {}",349				val.value_type()350			)351		};352		if !arr.is_empty() {353			for v in arr.iter() {354				let v = v?;355				out.push_str("---\n");356				self.0.manifest_buf(v, out)?;357				out.push('\n');358			}359			out.push_str("...");360		}361		Ok(())362	}363}364365pub fn escape_string_json(s: &str) -> String {366	let mut buf = String::new();367	escape_string_json_buf(s, &mut buf);368	buf369}370371// Json string encoding was borrowed from https://github.com/serde-rs/json372373const BB: u8 = b'b'; // \x08374const TT: u8 = b't'; // \x09375const NN: u8 = b'n'; // \x0A376const FF: u8 = b'f'; // \x0C377const RR: u8 = b'r'; // \x0D378const QU: u8 = b'"'; // \x22379const BS: u8 = b'\\'; // \x5C380const UU: u8 = b'u'; // \x00...\x1F except the ones above381const __: u8 = 0;382383// Lookup table of escape sequences. A value of b'x' at index i means that byte384// i is escaped as "\x" in JSON. A value of 0 means that byte i is not escaped.385static ESCAPE: [u8; 256] = [386	//   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F387	UU, UU, UU, UU, UU, UU, UU, UU, BB, TT, NN, UU, FF, RR, UU, UU, // 0388	UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, // 1389	__, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2390	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3391	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4392	__, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5393	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 6394	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7395	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8396	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9397	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A398	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B399	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C400	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D401	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E402	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F403];404405pub fn escape_string_json_buf(value: &str, buf: &mut String) {406	// Safety: we only write correct utf-8 in this function407	let buf: &mut Vec<u8> = unsafe { &mut *ptr::from_mut(buf).cast::<Vec<u8>>() };408	let bytes = value.as_bytes();409410	// Perfect for ascii strings, removes any reallocations411	buf.reserve(value.len() + 2);412413	buf.push(b'"');414415	let mut start = 0;416417	for (i, &byte) in bytes.iter().enumerate() {418		let escape = ESCAPE[byte as usize];419		if escape == __ {420			continue;421		}422423		if start < i {424			buf.extend_from_slice(&bytes[start..i]);425		}426		start = i + 1;427428		match escape {429			self::BB | self::TT | self::NN | self::FF | self::RR | self::QU | self::BS => {430				buf.extend_from_slice(&[b'\\', escape]);431			}432			self::UU => {433				static HEX_DIGITS: [u8; 16] = *b"0123456789abcdef";434				let bytes = &[435					b'\\',436					b'u',437					b'0',438					b'0',439					HEX_DIGITS[(byte >> 4) as usize],440					HEX_DIGITS[(byte & 0xF) as usize],441				];442				buf.extend_from_slice(bytes);443			}444			_ => unreachable!(),445		}446	}447448	if start == bytes.len() {449		buf.push(b'"');450		return;451	}452453	buf.extend_from_slice(&bytes[start..]);454	buf.push(b'"');455}