git.delta.rocks / jrsonnet / refs/commits / e17e60d35bf5

1use std::{borrow::Cow, fmt::Write};23use jrsonnet_evaluator::{4	bail,5	manifest::{escape_string_json_buf, ManifestFormat},6	Result, Val,7};89pub struct YamlFormat<'s> {10	/// Padding before fields, i.e11	/// ```yaml12	/// a:13	///   b:14	/// ## <- this15	/// ```16	padding: Cow<'s, str>,17	/// Padding before array elements in objects18	/// ```yaml19	/// a:20	///   - 121	/// ## <- this22	/// ```23	arr_element_padding: Cow<'s, str>,24	/// Should yaml keys appear unescaped, when possible25	/// ```yaml26	/// "safe_key": 127	/// # vs28	/// safe_key: 129	/// ```30	quote_keys: bool,31	/// If true - then order of fields is preserved as written,32	/// instead of sorting alphabetically33	#[cfg(feature = "exp-preserve-order")]34	preserve_order: bool,35}36impl YamlFormat<'_> {37	pub fn cli(38		padding: usize,39		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,40	) -> Self {41		let padding = " ".repeat(padding);42		Self {43			padding: Cow::Owned(padding.clone()),44			arr_element_padding: Cow::Owned(padding),45			quote_keys: false,46			#[cfg(feature = "exp-preserve-order")]47			preserve_order,48		}49	}50	pub fn std_to_yaml(51		indent_array_in_object: bool,52		quote_keys: bool,53		#[cfg(feature = "exp-preserve-order")] preserve_order: bool,54	) -> Self {55		Self {56			padding: Cow::Borrowed("  "),57			arr_element_padding: Cow::Borrowed(if indent_array_in_object { "  " } else { "" }),58			quote_keys,59			#[cfg(feature = "exp-preserve-order")]60			preserve_order,61		}62	}63}64impl ManifestFormat for YamlFormat<'_> {65	fn manifest_buf(&self, val: Val, buf: &mut String) -> Result<()> {66		manifest_yaml_ex_buf(&val, buf, &mut String::new(), self)67	}68}6970/// From <https://github.com/chyh1990/yaml-rust/blob/da52a68615f2ecdd6b7e4567019f280c433c1521/src/emitter.rs#L289>71/// With added date check72fn yaml_needs_quotes(string: &str) -> bool {73	fn need_quotes_spaces(string: &str) -> bool {74		string.starts_with(' ') || string.ends_with(' ')75	}7677	string.is_empty()78		|| need_quotes_spaces(string)79		|| string.starts_with(|c| matches!(c, '&' | '*' | '?' | '|' | '-' | '<' | '>' | '=' | '!' | '%' | '@'))80		|| string.contains(|c| matches!(c, ':' | '{' | '}' | '[' | ']' | ',' | '#' | '`' | '\"' | '\'' | '\\' | '\0'..='\x06' | '\t' | '\n' | '\r' | '\x0e'..='\x1a' | '\x1c'..='\x1f'))81		|| [82			// http://yaml.org/type/bool.html83			"yes", "Yes", "YES", "no", "No", "NO", "True", "TRUE", "true", "False", "FALSE", "false",84			"on", "On", "ON", "off", "Off", "OFF", // http://yaml.org/type/null.html85			"null", "Null", "NULL", "~",86			// > Quoted in std.jsonnet, however, in serde_yaml they were quoted:87			// > Note: 'y', 'Y', 'n', 'N', is not quoted deliberately, as in libyaml. PyYAML also parse88			// > them as string, not booleans, although it is violating the YAML 1.1 specification.89			// > See https://github.com/dtolnay/serde-yaml/pull/83#discussion_r152628088.90			"y", "Y", "n", "N",91			"-.inf", "+.inf", ".inf",92			"-", "---", ""93		].contains(&string)94		|| (string.chars().all(|c| matches!(c, '0'..='9' | '-'))95			&& string.chars().filter(|c| *c == '-').count() == 2)96		|| string.starts_with('.')97		|| string.starts_with("0x")98		|| string.parse::<i64>().is_ok()99		|| string.parse::<f64>().is_ok()100}101102#[allow(dead_code)]103fn manifest_yaml_ex(val: &Val, options: &YamlFormat<'_>) -> Result<String> {104	let mut out = String::new();105	manifest_yaml_ex_buf(val, &mut out, &mut String::new(), options)?;106	Ok(out)107}108109#[allow(clippy::too_many_lines)]110fn manifest_yaml_ex_buf(111	val: &Val,112	buf: &mut String,113	cur_padding: &mut String,114	options: &YamlFormat<'_>,115) -> Result<()> {116	match val {117		Val::Bool(v) => {118			if *v {119				buf.push_str("true");120			} else {121				buf.push_str("false");122			}123		}124		Val::Null => buf.push_str("null"),125		Val::Str(s) => {126			let s = s.clone().into_flat();127			if s.is_empty() {128				buf.push_str("\"\"");129			} else if let Some(s) = s.strip_suffix('\n') {130				buf.push('|');131				for line in s.split('\n') {132					buf.push('\n');133					buf.push_str(cur_padding);134					buf.push_str(&options.padding);135					buf.push_str(line);136				}137			} else if !options.quote_keys && !yaml_needs_quotes(&s) {138				buf.push_str(&s);139			} else {140				escape_string_json_buf(&s, buf);141			}142		}143		Val::Num(n) => write!(buf, "{}", *n).unwrap(),144		#[cfg(feature = "exp-bigint")]145		Val::BigInt(n) => write!(buf, "{}", *n).unwrap(),146		Val::Arr(a) => {147			if a.is_empty() {148				buf.push_str("[]");149			} else {150				for (i, item) in a.iter().enumerate() {151					if i != 0 {152						buf.push('\n');153						buf.push_str(cur_padding);154					}155					let item = item?;156					buf.push('-');157					match &item {158						Val::Arr(a) if !a.is_empty() => {159							buf.push('\n');160							buf.push_str(cur_padding);161							buf.push_str(&options.padding);162						}163						_ => buf.push(' '),164					}165					let extra_padding = match &item {166						Val::Arr(a) => !a.is_empty(),167						Val::Obj(o) => !o.is_empty(),168						_ => false,169					};170					let prev_len = cur_padding.len();171					if extra_padding {172						cur_padding.push_str(&options.padding);173					}174					manifest_yaml_ex_buf(&item, buf, cur_padding, options)?;175					cur_padding.truncate(prev_len);176				}177			}178		}179		Val::Obj(o) => {180			if o.is_empty() {181				buf.push_str("{}");182			} else {183				for (i, key) in o184					.fields(185						#[cfg(feature = "exp-preserve-order")]186						options.preserve_order,187					)188					.iter()189					.enumerate()190				{191					if i != 0 {192						buf.push('\n');193						buf.push_str(cur_padding);194					}195					if !options.quote_keys && !yaml_needs_quotes(key) {196						buf.push_str(key);197					} else {198						escape_string_json_buf(key, buf);199					}200					buf.push(':');201					let prev_len = cur_padding.len();202					let item = o.get(key.clone())?.expect("field exists");203					match &item {204						Val::Arr(a) if !a.is_empty() => {205							buf.push('\n');206							buf.push_str(cur_padding);207							buf.push_str(&options.arr_element_padding);208							cur_padding.push_str(&options.arr_element_padding);209						}210						Val::Obj(o) if !o.is_empty() => {211							buf.push('\n');212							buf.push_str(cur_padding);213							buf.push_str(&options.padding);214							cur_padding.push_str(&options.padding);215						}216						_ => buf.push(' '),217					}218					manifest_yaml_ex_buf(&item, buf, cur_padding, options)?;219					cur_padding.truncate(prev_len);220				}221			}222		}223		Val::Func(_) => bail!("tried to manifest function"),224	}225	Ok(())226}