2019-08-06 07:03:16 +01:00
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// parser related functions
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2019-08-04 10:46:10 +01:00
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2019-08-06 07:03:16 +01:00
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use indextree::{Arena, NodeId};
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use jetscii::bytes;
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use memchr::{memchr, memchr2, memchr_iter};
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2019-08-04 10:46:10 +01:00
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use nom::{
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2019-08-05 15:23:32 +01:00
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branch::alt,
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bytes::complete::{tag, take_till},
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character::complete::space0,
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error::ErrorKind,
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error_position, Err, IResult,
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2019-08-04 10:46:10 +01:00
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};
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2019-08-06 07:03:16 +01:00
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use crate::config::ParseConfig;
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use crate::elements::*;
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pub enum Container<'a> {
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// List
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List {
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content: &'a str,
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node: NodeId,
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indent: usize,
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},
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// Block, List Item
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Block {
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content: &'a str,
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node: NodeId,
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},
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// Pargraph, Inline Markup
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Inline {
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content: &'a str,
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node: NodeId,
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},
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// Headline
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Headline {
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content: &'a str,
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node: NodeId,
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},
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// Document
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Document {
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content: &'a str,
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node: NodeId,
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},
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}
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pub fn parse_title<'a>(
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arena: &mut Arena<Element<'a>>,
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content: &'a str,
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parent: NodeId,
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containers: &mut Vec<Container<'a>>,
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config: &ParseConfig,
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) -> &'a str {
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let (tail, title) = Title::parse(content, config).unwrap();
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let content = title.raw;
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let node = arena.new_node(Element::Title(title));
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parent.append(node, arena).unwrap();
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containers.push(Container::Inline { content, node });
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tail
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}
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pub fn parse_section_and_headlines<'a>(
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arena: &mut Arena<Element<'a>>,
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content: &'a str,
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parent: NodeId,
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containers: &mut Vec<Container<'a>>,
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) {
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let content = skip_empty_lines(content);
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if content.is_empty() {
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return;
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}
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let mut last_end = 0;
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for i in memchr_iter(b'\n', content.as_bytes()) {
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if let Some((mut tail, headline_content)) = parse_headline(&content[last_end..]) {
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if last_end != 0 {
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let node = arena.new_node(Element::Section);
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parent.append(node, arena).unwrap();
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containers.push(Container::Block {
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content: &content[0..last_end],
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node,
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});
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}
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let node = arena.new_node(Element::Headline);
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parent.append(node, arena).unwrap();
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containers.push(Container::Headline {
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content: headline_content,
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node,
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});
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while let Some((new_tail, content)) = parse_headline(tail) {
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let node = arena.new_node(Element::Headline);
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parent.append(node, arena).unwrap();
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containers.push(Container::Headline { content, node });
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tail = new_tail;
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}
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return;
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}
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last_end = i + 1;
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}
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let node = arena.new_node(Element::Section);
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parent.append(node, arena).unwrap();
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containers.push(Container::Block { content, node });
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}
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pub fn parse_headline(text: &str) -> Option<(&str, &str)> {
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let level = get_headline_level(text)?;
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for i in memchr_iter(b'\n', text.as_bytes()) {
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if let Some(l) = get_headline_level(&text[i + 1..]) {
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if l <= level {
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return Some((&text[i + 1..], &text[0..i + 1]));
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}
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}
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}
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Some(("", text))
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}
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pub fn get_headline_level(text: &str) -> Option<usize> {
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if let Some(off) = memchr2(b'\n', b' ', text.as_bytes()) {
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if off > 0 && text[0..off].as_bytes().iter().all(|&c| c == b'*') {
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Some(off)
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} else {
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None
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}
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} else if !text.is_empty() && text.as_bytes().iter().all(|&c| c == b'*') {
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Some(text.len())
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} else {
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None
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}
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}
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pub fn parse_blocks<'a>(
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arena: &mut Arena<Element<'a>>,
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content: &'a str,
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parent: NodeId,
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containers: &mut Vec<Container<'a>>,
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) {
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let mut tail = skip_empty_lines(content);
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if let Some((new_tail, element)) = parse_block(content, arena, containers) {
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parent.append(element, arena).unwrap();
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tail = skip_empty_lines(new_tail);
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}
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let mut text = tail;
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let mut pos = 0;
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while !tail.is_empty() {
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let i = memchr(b'\n', tail.as_bytes())
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.map(|i| i + 1)
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.unwrap_or_else(|| tail.len());
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if tail.as_bytes()[0..i].iter().all(u8::is_ascii_whitespace) {
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tail = skip_empty_lines(&tail[i..]);
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let node = arena.new_node(Element::Paragraph);
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parent.append(node, arena).unwrap();
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containers.push(Container::Inline {
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content: &text[0..pos].trim_end_matches('\n'),
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node,
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});
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text = tail;
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pos = 0;
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} else if let Some((new_tail, element)) = parse_block(tail, arena, containers) {
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if pos != 0 {
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let node = arena.new_node(Element::Paragraph);
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parent.append(node, arena).unwrap();
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containers.push(Container::Inline {
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content: &text[0..pos].trim_end_matches('\n'),
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node,
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});
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pos = 0;
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}
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parent.append(element, arena).unwrap();
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tail = skip_empty_lines(new_tail);
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text = tail;
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} else {
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tail = &tail[i..];
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pos += i;
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}
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}
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if !text.is_empty() {
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let node = arena.new_node(Element::Paragraph);
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parent.append(node, arena).unwrap();
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containers.push(Container::Inline {
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content: &text[0..pos].trim_end_matches('\n'),
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node,
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});
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}
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}
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pub fn parse_block<'a>(
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contents: &'a str,
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arena: &mut Arena<Element<'a>>,
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containers: &mut Vec<Container<'a>>,
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) -> Option<(&'a str, NodeId)> {
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if let Some((tail, node)) = prase_table(arena, contents, containers) {
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return Some((tail, node));
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}
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if let Some((tail, fn_def, content)) = FnDef::parse(contents) {
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let node = arena.new_node(Element::FnDef(fn_def));
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containers.push(Container::Block { content, node });
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return Some((tail, node));
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} else if let Some((tail, list, content)) = List::parse(contents) {
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let indent = list.indent;
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let node = arena.new_node(Element::List(list));
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containers.push(Container::List {
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content,
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node,
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indent,
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});
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return Some((tail, node));
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}
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let tail = contents.trim_start();
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if let Ok((tail, clock)) = Clock::parse(tail) {
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return Some((tail, arena.new_node(clock)));
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}
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// TODO: LaTeX environment
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if tail.starts_with("\\begin{") {}
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if tail.starts_with('-') {
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if let Ok((tail, rule)) = Rule::parse(tail) {
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return Some((tail, arena.new_node(rule)));
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}
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}
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if tail.starts_with(':') {
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if let Ok((tail, (drawer, content))) = Drawer::parse(tail) {
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let node = arena.new_node(drawer.into());
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containers.push(Container::Block { content, node });
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return Some((tail, node));
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}
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}
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// FixedWidth
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if tail == ":" || tail.starts_with(": ") || tail.starts_with(":\n") {
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let mut last_end = 1; // ":"
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for i in memchr_iter(b'\n', contents.as_bytes()) {
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last_end = i + 1;
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let tail = contents[last_end..].trim_start();
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if !(tail == ":" || tail.starts_with(": ") || tail.starts_with(":\n")) {
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let fixed_width = arena.new_node(Element::FixedWidth {
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value: &contents[0..last_end],
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});
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return Some((&contents[last_end..], fixed_width));
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}
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}
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let fixed_width = arena.new_node(Element::FixedWidth {
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value: &contents[0..last_end],
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});
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return Some((&contents[last_end..], fixed_width));
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}
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// Comment
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if tail == "#" || tail.starts_with("# ") || tail.starts_with("#\n") {
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let mut last_end = 1; // "#"
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for i in memchr_iter(b'\n', contents.as_bytes()) {
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last_end = i + 1;
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let line = contents[last_end..].trim_start();
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if !(line == "#" || line.starts_with("# ") || line.starts_with("#\n")) {
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let comment = arena.new_node(Element::Comment {
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value: &contents[0..last_end],
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});
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return Some((&contents[last_end..], comment));
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}
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}
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let comment = arena.new_node(Element::Comment {
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value: &contents[0..last_end],
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});
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return Some((&contents[last_end..], comment));
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}
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if tail.starts_with("#+") {
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if let Ok((tail, (block, content))) = Block::parse(tail) {
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match &*block.name.to_uppercase() {
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"CENTER" => {
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let node = arena.new_node(Element::CenterBlock(CenterBlock {
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parameters: block.args,
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}));
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containers.push(Container::Block { content, node });
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Some((tail, node))
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}
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"QUOTE" => {
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let node = arena.new_node(Element::QuoteBlock(QuoteBlock {
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parameters: block.args,
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}));
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containers.push(Container::Block { content, node });
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Some((tail, node))
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}
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"COMMENT" => {
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let node = arena.new_node(Element::CommentBlock(CommentBlock {
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data: block.args,
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contents: content,
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}));
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Some((tail, node))
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}
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"EXAMPLE" => {
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let node = arena.new_node(Element::ExampleBlock(ExampleBlock {
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data: block.args,
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contents: content,
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}));
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Some((tail, node))
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}
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"EXPORT" => {
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let node = arena.new_node(Element::ExportBlock(ExportBlock {
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data: block.args.unwrap_or(""),
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contents: content,
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}));
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Some((tail, node))
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}
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"SRC" => {
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let (language, arguments) = block
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.args
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.map(|args| args.split_at(args.find(' ').unwrap_or_else(|| args.len())))
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.unwrap_or(("", ""));
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let node = arena.new_node(Element::SourceBlock(SourceBlock {
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arguments,
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language,
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contents: content,
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}));
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Some((tail, node))
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}
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"VERSE" => {
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let node = arena.new_node(Element::VerseBlock(VerseBlock {
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parameters: block.args,
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}));
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containers.push(Container::Block { content, node });
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Some((tail, node))
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}
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_ => {
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let node = arena.new_node(Element::SpecialBlock(SpecialBlock {
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parameters: block.args,
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name: block.name,
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}));
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containers.push(Container::Block { content, node });
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Some((tail, node))
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}
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}
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} else if let Ok((tail, (dyn_block, content))) = DynBlock::parse(tail) {
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let node = arena.new_node(dyn_block);
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containers.push(Container::Block { content, node });
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Some((tail, node))
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} else {
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Keyword::parse(tail)
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.ok()
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.map(|(tail, kw)| (tail, arena.new_node(kw)))
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}
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} else {
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None
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}
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}
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pub fn parse_inlines<'a>(
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arena: &mut Arena<Element<'a>>,
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content: &'a str,
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parent: NodeId,
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containers: &mut Vec<Container<'a>>,
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) {
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let mut tail = content;
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if let Some((new_tail, element)) = parse_inline(tail, arena, containers) {
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parent.append(element, arena).unwrap();
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tail = new_tail;
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}
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let mut text = tail;
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let mut pos = 0;
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let bs = bytes!(b'@', b'<', b'[', b' ', b'(', b'{', b'\'', b'"', b'\n');
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while let Some(off) = bs.find(tail.as_bytes()) {
|
|
|
|
match tail.as_bytes()[off] {
|
|
|
|
b'{' => {
|
|
|
|
if let Some((new_tail, element)) = parse_inline(&tail[off..], arena, containers) {
|
|
|
|
if pos != 0 {
|
|
|
|
let node = arena.new_node(Element::Text {
|
|
|
|
value: &text[0..pos + off],
|
|
|
|
});
|
|
|
|
parent.append(node, arena).unwrap();
|
|
|
|
pos = 0;
|
|
|
|
}
|
|
|
|
parent.append(element, arena).unwrap();
|
|
|
|
tail = new_tail;
|
|
|
|
text = new_tail;
|
|
|
|
continue;
|
|
|
|
} else if let Some((new_tail, element)) =
|
|
|
|
parse_inline(&tail[off + 1..], arena, containers)
|
|
|
|
{
|
|
|
|
let node = arena.new_node(Element::Text {
|
|
|
|
value: &text[0..pos + off + 1],
|
|
|
|
});
|
|
|
|
parent.append(node, arena).unwrap();
|
|
|
|
pos = 0;
|
|
|
|
parent.append(element, arena).unwrap();
|
|
|
|
tail = new_tail;
|
|
|
|
text = new_tail;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
b' ' | b'(' | b'\'' | b'"' | b'\n' => {
|
|
|
|
if let Some((new_tail, element)) = parse_inline(&tail[off + 1..], arena, containers)
|
|
|
|
{
|
|
|
|
let node = arena.new_node(Element::Text {
|
|
|
|
value: &text[0..pos + off + 1],
|
|
|
|
});
|
|
|
|
parent.append(node, arena).unwrap();
|
|
|
|
pos = 0;
|
|
|
|
parent.append(element, arena).unwrap();
|
|
|
|
tail = new_tail;
|
|
|
|
text = new_tail;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
_ => {
|
|
|
|
if let Some((new_tail, element)) = parse_inline(&tail[off..], arena, containers) {
|
|
|
|
if pos != 0 {
|
|
|
|
let node = arena.new_node(Element::Text {
|
|
|
|
value: &text[0..pos + off],
|
|
|
|
});
|
|
|
|
parent.append(node, arena).unwrap();
|
|
|
|
pos = 0;
|
|
|
|
}
|
|
|
|
parent.append(element, arena).unwrap();
|
|
|
|
tail = new_tail;
|
|
|
|
text = new_tail;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
tail = &tail[off + 1..];
|
|
|
|
pos += off + 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if !text.is_empty() {
|
|
|
|
let node = arena.new_node(Element::Text { value: text });
|
|
|
|
parent.append(node, arena).unwrap();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn parse_inline<'a>(
|
|
|
|
contents: &'a str,
|
|
|
|
arena: &mut Arena<Element<'a>>,
|
|
|
|
containers: &mut Vec<Container<'a>>,
|
|
|
|
) -> Option<(&'a str, NodeId)> {
|
|
|
|
if contents.len() < 3 {
|
|
|
|
return None;
|
|
|
|
}
|
|
|
|
|
|
|
|
let bytes = contents.as_bytes();
|
|
|
|
match bytes[0] {
|
|
|
|
b'@' => Snippet::parse(contents)
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, element)| (tail, arena.new_node(element))),
|
|
|
|
b'{' => Macros::parse(contents)
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, element)| (tail, arena.new_node(element))),
|
|
|
|
b'<' => RadioTarget::parse(contents)
|
|
|
|
.map(|(tail, (radio, _content))| (tail, radio))
|
|
|
|
.or_else(|_| Target::parse(contents))
|
|
|
|
.or_else(|_| {
|
|
|
|
Timestamp::parse_active(contents).map(|(tail, timestamp)| (tail, timestamp.into()))
|
|
|
|
})
|
|
|
|
.or_else(|_| {
|
|
|
|
Timestamp::parse_diary(contents).map(|(tail, timestamp)| (tail, timestamp.into()))
|
|
|
|
})
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, element)| (tail, arena.new_node(element))),
|
|
|
|
b'[' => {
|
|
|
|
if contents[1..].starts_with("fn:") {
|
|
|
|
FnRef::parse(contents)
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, fn_ref)| (tail, arena.new_node(fn_ref.into())))
|
|
|
|
} else if bytes[1] == b'[' {
|
|
|
|
Link::parse(contents)
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, element)| (tail, arena.new_node(element)))
|
|
|
|
} else {
|
|
|
|
Cookie::parse(contents)
|
|
|
|
.map(|(tail, cookie)| (tail, cookie.into()))
|
|
|
|
.or_else(|_| {
|
|
|
|
Timestamp::parse_inactive(contents)
|
|
|
|
.map(|(tail, timestamp)| (tail, timestamp.into()))
|
|
|
|
})
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, element)| (tail, arena.new_node(element)))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
b'*' => {
|
|
|
|
if let Some((tail, content)) = parse_emphasis(contents, b'*') {
|
|
|
|
let node = arena.new_node(Element::Bold);
|
|
|
|
containers.push(Container::Inline { content, node });
|
|
|
|
Some((tail, node))
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
b'+' => {
|
|
|
|
if let Some((tail, content)) = parse_emphasis(contents, b'+') {
|
|
|
|
let node = arena.new_node(Element::Strike);
|
|
|
|
containers.push(Container::Inline { content, node });
|
|
|
|
Some((tail, node))
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
b'/' => {
|
|
|
|
if let Some((tail, content)) = parse_emphasis(contents, b'/') {
|
|
|
|
let node = arena.new_node(Element::Italic);
|
|
|
|
containers.push(Container::Inline { content, node });
|
|
|
|
Some((tail, node))
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
b'_' => {
|
|
|
|
if let Some((tail, content)) = parse_emphasis(contents, b'_') {
|
|
|
|
let node = arena.new_node(Element::Underline);
|
|
|
|
containers.push(Container::Inline { content, node });
|
|
|
|
Some((tail, node))
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
b'=' => parse_emphasis(contents, b'=')
|
|
|
|
.map(|(tail, value)| (tail, arena.new_node(Element::Verbatim { value }))),
|
|
|
|
b'~' => parse_emphasis(contents, b'~')
|
|
|
|
.map(|(tail, value)| (tail, arena.new_node(Element::Code { value }))),
|
|
|
|
b's' => InlineSrc::parse(contents)
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, element)| (tail, arena.new_node(element))),
|
|
|
|
b'c' => InlineCall::parse(contents)
|
|
|
|
.ok()
|
|
|
|
.map(|(tail, element)| (tail, arena.new_node(element))),
|
|
|
|
_ => None,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn parse_list_items<'a>(
|
|
|
|
arena: &mut Arena<Element<'a>>,
|
|
|
|
mut contents: &'a str,
|
|
|
|
indent: usize,
|
|
|
|
parent: NodeId,
|
|
|
|
containers: &mut Vec<Container<'a>>,
|
|
|
|
) {
|
|
|
|
while !contents.is_empty() {
|
|
|
|
let (tail, list_item, content) = ListItem::parse(contents, indent);
|
|
|
|
let list_item = Element::ListItem(list_item);
|
|
|
|
let node = arena.new_node(list_item);
|
|
|
|
parent.append(node, arena).unwrap();
|
|
|
|
containers.push(Container::Block { content, node });
|
|
|
|
contents = tail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn prase_table<'a>(
|
|
|
|
arena: &mut Arena<Element<'a>>,
|
|
|
|
contents: &'a str,
|
|
|
|
containers: &mut Vec<Container<'a>>,
|
|
|
|
) -> Option<(&'a str, NodeId)> {
|
|
|
|
if contents.trim_start().starts_with('|') {
|
|
|
|
let table_node = arena.new_node(Element::Table(Table::Org { tblfm: None }));
|
|
|
|
|
|
|
|
let mut last_end = 0;
|
|
|
|
for start in memchr_iter(b'\n', contents.as_bytes()) {
|
|
|
|
let line = contents[last_end..start].trim();
|
|
|
|
match TableRow::parse(line) {
|
|
|
|
Some(TableRow::Standard) => {
|
|
|
|
let row_node = arena.new_node(Element::TableRow(TableRow::Standard));
|
|
|
|
table_node.append(row_node, arena).unwrap();
|
|
|
|
for cell in line[1..].split_terminator('|') {
|
|
|
|
let cell_node = arena.new_node(Element::TableCell);
|
|
|
|
row_node.append(cell_node, arena).unwrap();
|
|
|
|
containers.push(Container::Inline {
|
|
|
|
content: cell.trim(),
|
|
|
|
node: cell_node,
|
|
|
|
});
|
|
|
|
}
|
|
|
|
}
|
|
|
|
Some(TableRow::Rule) => {
|
|
|
|
let row_node = arena.new_node(Element::TableRow(TableRow::Rule));
|
|
|
|
table_node.append(row_node, arena).unwrap();
|
|
|
|
}
|
|
|
|
None => return Some((&contents[last_end..], table_node)),
|
|
|
|
}
|
|
|
|
last_end = start + 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
Some(("", table_node))
|
|
|
|
} else if contents.trim_start().starts_with("+-")
|
|
|
|
&& contents[0..memchr(b'\n', contents.as_bytes()).unwrap_or_else(|| contents.len())]
|
|
|
|
.trim()
|
|
|
|
.as_bytes()
|
|
|
|
.iter()
|
|
|
|
.any(|&c| c != b'+' || c != b'-')
|
|
|
|
{
|
|
|
|
let mut last_end = 0;
|
|
|
|
for start in memchr_iter(b'\n', contents.as_bytes()) {
|
|
|
|
let line = contents[last_end..start].trim();
|
|
|
|
if !line.starts_with('|') && !line.starts_with('+') {
|
|
|
|
return {
|
|
|
|
Some((
|
|
|
|
&contents[last_end..],
|
|
|
|
arena.new_node(Element::Table(Table::TableEl {
|
|
|
|
value: &contents[0..last_end],
|
|
|
|
})),
|
|
|
|
))
|
|
|
|
};
|
|
|
|
}
|
|
|
|
last_end = start + 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
Some((
|
|
|
|
"",
|
|
|
|
arena.new_node(Element::Table(Table::TableEl { value: contents })),
|
|
|
|
))
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn eol(input: &str) -> IResult<&str, ()> {
|
2019-08-04 10:46:10 +01:00
|
|
|
let (input, _) = space0(input)?;
|
|
|
|
if input.is_empty() {
|
|
|
|
Ok(("", ()))
|
|
|
|
} else {
|
|
|
|
let (input, _) = tag("\n")(input)?;
|
|
|
|
Ok((input, ()))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-08-06 07:03:16 +01:00
|
|
|
pub fn take_until_eol(input: &str) -> IResult<&str, &str> {
|
2019-08-04 10:46:10 +01:00
|
|
|
if let Some(i) = memchr(b'\n', input.as_bytes()) {
|
|
|
|
Ok((&input[i + 1..], input[0..i].trim()))
|
|
|
|
} else {
|
|
|
|
Ok(("", input.trim()))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-08-06 07:03:16 +01:00
|
|
|
pub fn take_lines_till(predicate: impl Fn(&str) -> bool) -> impl Fn(&str) -> IResult<&str, &str> {
|
2019-08-04 10:46:10 +01:00
|
|
|
move |input| {
|
|
|
|
let mut start = 0;
|
|
|
|
for i in memchr_iter(b'\n', input.as_bytes()) {
|
|
|
|
if predicate(input[start..i].trim()) {
|
|
|
|
return Ok((&input[i + 1..], &input[0..start]));
|
|
|
|
}
|
|
|
|
start = i + 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if predicate(input[start..].trim()) {
|
|
|
|
Ok(("", &input[0..start]))
|
|
|
|
} else {
|
|
|
|
Err(Err::Error(error_position!(input, ErrorKind::TakeTill1)))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2019-08-05 15:23:32 +01:00
|
|
|
|
2019-08-06 07:03:16 +01:00
|
|
|
pub fn take_one_word(input: &str) -> IResult<&str, &str> {
|
2019-08-05 15:23:32 +01:00
|
|
|
alt((take_till(|c: char| c == ' ' || c == '\t'), |input| {
|
|
|
|
Ok(("", input))
|
|
|
|
}))(input)
|
|
|
|
}
|
|
|
|
|
2019-08-06 07:03:16 +01:00
|
|
|
pub fn skip_empty_lines(contents: &str) -> &str {
|
2019-08-05 15:23:32 +01:00
|
|
|
let mut i = 0;
|
|
|
|
for pos in memchr_iter(b'\n', contents.as_bytes()) {
|
|
|
|
if contents.as_bytes()[i..pos]
|
|
|
|
.iter()
|
|
|
|
.all(u8::is_ascii_whitespace)
|
|
|
|
{
|
|
|
|
i = pos + 1;
|
|
|
|
} else {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
&contents[i..]
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_skip_empty_lines() {
|
|
|
|
assert_eq!(skip_empty_lines("foo"), "foo");
|
|
|
|
assert_eq!(skip_empty_lines(" foo"), " foo");
|
|
|
|
assert_eq!(skip_empty_lines(" \nfoo\n"), "foo\n");
|
|
|
|
assert_eq!(skip_empty_lines(" \n\n\nfoo\n"), "foo\n");
|
|
|
|
assert_eq!(skip_empty_lines(" \n \n\nfoo\n"), "foo\n");
|
|
|
|
assert_eq!(skip_empty_lines(" \n \n\n foo\n"), " foo\n");
|
|
|
|
}
|