git.delta.rocks / jrsonnet / refs/commits / 0ef9787dd3a6

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.toString, except does not keeps top-level string as-is88	/// To avoid confusion, the format is private in jrsonnet, use [`ToStringFormat`] instead89	const fn std_to_string_helper() -> Self {90		Self {91			padding: Cow::Borrowed(""),92			mtype: JsonFormatting::ToString,93			newline: "\n",94			key_val_sep: ": ",95			#[cfg(feature = "exp-preserve-order")]96			preserve_order: false,97			#[cfg(feature = "exp-bigint")]98			preserve_bigints: false,99			debug_truncate_strings: None,100		}101	}102	pub fn std_to_json(103		padding: String,104		newline: &'s str,105		key_val_sep: &'s str,106		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,107	) -> Self {108		Self {109			padding: Cow::Owned(padding),110			mtype: JsonFormatting::Std,111			newline,112			key_val_sep,113			#[cfg(feature = "exp-preserve-order")]114			preserve_order,115			#[cfg(feature = "exp-bigint")]116			preserve_bigints: false,117			debug_truncate_strings: None,118		}119	}120	// Same format as CLI manifestification121	pub fn cli(122		padding: usize,123		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,124	) -> Self {125		if padding == 0 {126			return Self::minify(127				#[cfg(feature = "exp-preserve-order")]128				preserve_order,129			);130		}131		Self {132			padding: Cow::Owned(" ".repeat(padding)),133			mtype: JsonFormatting::Manifest,134			newline: "\n",135			key_val_sep: ": ",136			#[cfg(feature = "exp-preserve-order")]137			preserve_order,138			#[cfg(feature = "exp-bigint")]139			preserve_bigints: false,140			debug_truncate_strings: None,141		}142	}143	// Same format as CLI manifestification144	pub fn debug() -> Self {145		Self {146			padding: Cow::Borrowed("   "),147			mtype: JsonFormatting::Manifest,148			newline: "\n",149			key_val_sep: ": ",150			#[cfg(feature = "exp-preserve-order")]151			preserve_order: true,152			#[cfg(feature = "exp-bigint")]153			preserve_bigints: true,154			debug_truncate_strings: Some(256),155		}156	}157}158impl Default for JsonFormat<'static> {159	fn default() -> Self {160		Self {161			padding: Cow::Borrowed("    "),162			mtype: JsonFormatting::Manifest,163			newline: "\n",164			key_val_sep: ": ",165			#[cfg(feature = "exp-preserve-order")]166			preserve_order: false,167			#[cfg(feature = "exp-bigint")]168			preserve_bigints: false,169			debug_truncate_strings: None,170		}171	}172}173174pub fn manifest_json_ex(val: &Val, options: &JsonFormat<'_>) -> Result<String> {175	let mut out = String::new();176	manifest_json_ex_buf(val, &mut out, &mut String::new(), options)?;177	Ok(out)178}179180#[allow(clippy::too_many_lines)]181fn manifest_json_ex_buf(182	val: &Val,183	buf: &mut String,184	cur_padding: &mut String,185	options: &JsonFormat<'_>,186) -> Result<()> {187	use JsonFormatting::*;188189	let mtype = options.mtype;190	match val {191		Val::Bool(v) => {192			if *v {193				buf.push_str("true");194			} else {195				buf.push_str("false");196			}197		}198		Val::Null => buf.push_str("null"),199		Val::Str(s) => {200			let flat = s.clone().into_flat();201			if let Some(truncate) = options.debug_truncate_strings {202				if flat.len() > truncate {203					let (start, end) = flat.split_at(truncate / 2);204					let (_, end) = end.split_at(end.len() - truncate / 2);205					escape_string_json_buf(&format!("{start}..{end}"), buf);206				} else {207					escape_string_json_buf(&flat, buf);208				}209			} else {210				escape_string_json_buf(&flat, buf);211			}212		}213		Val::Num(n) => write!(buf, "{n}").unwrap(),214		#[cfg(feature = "exp-bigint")]215		Val::BigInt(n) => {216			if options.preserve_bigints {217				write!(buf, "{n}").unwrap();218			} else {219				write!(buf, "{:?}", n.to_string()).unwrap();220			}221		}222		Val::Arr(items) => {223			buf.push('[');224225			let old_len = cur_padding.len();226			cur_padding.push_str(&options.padding);227228			let mut had_items = false;229			for (i, item) in items.iter().enumerate() {230				had_items = true;231				let item = item.with_description(|| format!("elem <{i}> evaluation"))?;232233				if i != 0 {234					buf.push(',');235				}236				match mtype {237					Manifest | Std => {238						buf.push_str(options.newline);239						buf.push_str(cur_padding);240					}241					ToString if i != 0 => buf.push(' '),242					Minify | ToString => {}243				};244245				State::push_description(246					|| format!("elem <{i}> manifestification"),247					|| manifest_json_ex_buf(&item, buf, cur_padding, options),248				)?;249			}250251			cur_padding.truncate(old_len);252253			match mtype {254				Manifest | ToString if !had_items => {255					// Empty array as "[ ]"256					buf.push(' ');257				}258				Manifest => {259					buf.push_str(options.newline);260					buf.push_str(cur_padding);261				}262				Std => {263					if !had_items {264						// Stdlib formats empty array as "[\n\n]"265						buf.push_str(options.newline);266					}267					buf.push_str(options.newline);268					buf.push_str(cur_padding);269				}270				Minify | ToString => {}271			}272273			buf.push(']');274		}275		Val::Obj(obj) => {276			obj.run_assertions()?;277			buf.push('{');278279			let old_len = cur_padding.len();280			cur_padding.push_str(&options.padding);281282			let mut had_fields = false;283			for (i, (key, value)) in obj284				.iter(285					#[cfg(feature = "exp-preserve-order")]286					options.preserve_order,287				)288				.enumerate()289			{290				had_fields = true;291				let value = value.with_description(|| format!("field <{key}> evaluation"))?;292293				if i != 0 {294					buf.push(',');295				}296				match mtype {297					Manifest | Std => {298						buf.push_str(options.newline);299						buf.push_str(cur_padding);300					}301					ToString if i != 0 => buf.push(' '),302					Minify | ToString => {}303				}304305				escape_string_json_buf(&key, buf);306				buf.push_str(options.key_val_sep);307				State::push_description(308					|| format!("field <{key}> manifestification"),309					|| manifest_json_ex_buf(&value, buf, cur_padding, options),310				)?;311			}312313			cur_padding.truncate(old_len);314315			match mtype {316				Manifest | ToString if !had_fields => {317					// Empty object as "{ }"318					buf.push(' ');319				}320				Manifest => {321					buf.push_str(options.newline);322					buf.push_str(cur_padding);323				}324				Std => {325					if !had_fields {326						// Stdlib formats empty object as "{\n\n}"327						buf.push_str(options.newline);328					}329					buf.push_str(options.newline);330					buf.push_str(cur_padding);331				}332				Minify | ToString => {}333			}334335			buf.push('}');336		}337		Val::Func(_) => bail!("tried to manifest function"),338	};339	Ok(())340}341342impl ManifestFormat for JsonFormat<'_> {343	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {344		manifest_json_ex_buf(&val, buf, &mut String::new(), self)345	}346}347348/// Same as [`JsonFormat`] with pre-set options, but top-level string is serialized as-is,349/// without quoting.350pub struct ToStringFormat;351impl ManifestFormat for ToStringFormat {352	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {353		const JSON_TO_STRING: JsonFormat = JsonFormat::std_to_string_helper();354		if let Some(str) = val.as_str() {355			out.push_str(&str);356			return Ok(());357		}358		JSON_TO_STRING.manifest_buf(val, out)359	}360	fn file_trailing_newline(&self) -> bool {361		false362	}363}364pub struct StringFormat;365impl ManifestFormat for StringFormat {366	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {367		let Val::Str(s) = val else {368			bail!(369				"output should be string for string manifest format, got {}",370				val.value_type()371			)372		};373		write!(out, "{s}").unwrap();374		Ok(())375	}376	fn file_trailing_newline(&self) -> bool {377		false378	}379}380381pub struct YamlStreamFormat<I> {382	inner: I,383	c_document_end: bool,384	end_newline: bool,385}386impl<I> YamlStreamFormat<I> {387	pub fn std_yaml_stream(inner: I, c_document_end: bool) -> Self {388		Self {389			inner,390			c_document_end,391			// Stdlib format always inserts useless newline at the end392			end_newline: true,393		}394	}395	pub fn cli(inner: I) -> Self {396		Self {397			inner,398			c_document_end: true,399			end_newline: false,400		}401	}402}403impl<I: ManifestFormat> ManifestFormat for YamlStreamFormat<I> {404	fn manifest_buf(&self, val: Val, out: &mut String) -> Result<()> {405		let Val::Arr(arr) = val else {406			bail!(407				"output should be array for yaml stream format, got {}",408				val.value_type()409			)410		};411		if !arr.is_empty() {412			for (i, v) in arr.iter().enumerate() {413				let v = v.with_description(|| format!("elem <{i}> evaluation"))?;414				out.push_str("---\n");415				State::push_description(416					|| format!("elem <{i}> manifestification"),417					|| self.inner.manifest_buf(v, out),418				)?;419				out.push('\n');420			}421		}422		if self.c_document_end {423			out.push_str("...");424		}425		if self.end_newline {426			out.push('\n');427		}428		Ok(())429	}430}431432pub fn escape_string_json(s: &str) -> String {433	let mut buf = String::new();434	escape_string_json_buf(s, &mut buf);435	buf436}437438// Json string encoding was borrowed from https://github.com/serde-rs/json439440const BB: u8 = b'b'; // \x08441const TT: u8 = b't'; // \x09442const NN: u8 = b'n'; // \x0A443const FF: u8 = b'f'; // \x0C444const RR: u8 = b'r'; // \x0D445const QU: u8 = b'"'; // \x22446const BS: u8 = b'\\'; // \x5C447const UU: u8 = b'u'; // \x00...\x1F except the ones above448const __: u8 = 0;449450// Lookup table of escape sequences. A value of b'x' at index i means that byte451// i is escaped as "\x" in JSON. A value of 0 means that byte i is not escaped.452static ESCAPE: [u8; 256] = [453	//   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F454	UU, UU, UU, UU, UU, UU, UU, UU, BB, TT, NN, UU, FF, RR, UU, UU, // 0455	UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, // 1456	__, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2457	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3458	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4459	__, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5460	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 6461	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7462	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8463	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9464	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A465	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B466	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C467	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D468	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E469	__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F470];471472pub fn escape_string_json_buf(value: &str, buf: &mut String) {473	// Safety: we only write correct utf-8 in this function474	let buf: &mut Vec<u8> = unsafe { &mut *ptr::from_mut(buf).cast::<Vec<u8>>() };475	let bytes = value.as_bytes();476477	// Perfect for ascii strings, removes any reallocations478	buf.reserve(value.len() + 2);479480	buf.push(b'"');481482	let mut start = 0;483484	for (i, &byte) in bytes.iter().enumerate() {485		let escape = ESCAPE[byte as usize];486		if escape == __ {487			continue;488		}489490		if start < i {491			buf.extend_from_slice(&bytes[start..i]);492		}493		start = i + 1;494495		match escape {496			self::BB | self::TT | self::NN | self::FF | self::RR | self::QU | self::BS => {497				buf.extend_from_slice(&[b'\\', escape]);498			}499			self::UU => {500				static HEX_DIGITS: [u8; 16] = *b"0123456789abcdef";501				let bytes = &[502					b'\\',503					b'u',504					b'0',505					b'0',506					HEX_DIGITS[(byte >> 4) as usize],507					HEX_DIGITS[(byte & 0xF) as usize],508				];509				buf.extend_from_slice(bytes);510			}511			_ => unreachable!(),512		}513	}514515	if start == bytes.len() {516		buf.push(b'"');517		return;518	}519520	buf.extend_from_slice(&bytes[start..]);521	buf.push(b'"');522}