git.delta.rocks / jrsonnet / refs/commits / d349b9ef06a9

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 s.contains('\n') {138				buf.push_str("|-");139				for line in s.split('\n') {140					buf.push('\n');141					buf.push_str(cur_padding);142					buf.push_str(&options.padding);143					buf.push_str(line);144				}145			} else if !options.quote_keys && !yaml_needs_quotes(&s) {146				buf.push_str(&s);147			} else {148				escape_string_json_buf(&s, buf);149			}150		}151		Val::Num(n) => write!(buf, "{}", *n).unwrap(),152		#[cfg(feature = "exp-bigint")]153		Val::BigInt(n) => write!(buf, "{}", *n).unwrap(),154		Val::Arr(a) => {155			if a.is_empty() {156				buf.push_str("[]");157			} else {158				for (i, item) in a.iter().enumerate() {159					if i != 0 {160						buf.push('\n');161						buf.push_str(cur_padding);162					}163					let item = item?;164					buf.push('-');165					match &item {166						Val::Arr(a) if !a.is_empty() => {167							buf.push('\n');168							buf.push_str(cur_padding);169							buf.push_str(&options.padding);170						}171						_ => buf.push(' '),172					}173					let extra_padding = match &item {174						Val::Arr(a) => !a.is_empty(),175						Val::Obj(o) => !o.is_empty(),176						_ => false,177					};178					let prev_len = cur_padding.len();179					if extra_padding {180						cur_padding.push_str(&options.padding);181					}182					manifest_yaml_ex_buf(&item, buf, cur_padding, options)?;183					cur_padding.truncate(prev_len);184				}185			}186		}187		Val::Obj(o) => {188			if o.is_empty() {189				buf.push_str("{}");190			} else {191				for (i, key) in o192					.fields(193						#[cfg(feature = "exp-preserve-order")]194						options.preserve_order,195					)196					.iter()197					.enumerate()198				{199					if i != 0 {200						buf.push('\n');201						buf.push_str(cur_padding);202					}203					if !options.quote_keys && !yaml_needs_quotes(key) {204						buf.push_str(key);205					} else {206						escape_string_json_buf(key, buf);207					}208					buf.push(':');209					let prev_len = cur_padding.len();210					let item = o.get(key.clone())?.expect("field exists");211					match &item {212						Val::Arr(a) if !a.is_empty() => {213							buf.push('\n');214							buf.push_str(cur_padding);215							buf.push_str(&options.arr_element_padding);216							cur_padding.push_str(&options.arr_element_padding);217						}218						Val::Obj(o) if !o.is_empty() => {219							buf.push('\n');220							buf.push_str(cur_padding);221							buf.push_str(&options.padding);222							cur_padding.push_str(&options.padding);223						}224						_ => buf.push(' '),225					}226					manifest_yaml_ex_buf(&item, buf, cur_padding, options)?;227					cur_padding.truncate(prev_len);228				}229			}230		}231		Val::Func(_) => bail!("tried to manifest function"),232	}233	Ok(())234}