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snekdown/src/parser/inline.rs

547 lines
19 KiB
Rust

use super::{ParseError, ParseResult};
use crate::elements::tokens::*;
use crate::elements::BibReference;
use crate::elements::*;
use crate::parser::block::ParseBlock;
use crate::references::configuration::keys::BIB_REF_DISPLAY;
use crate::references::templates::{GetTemplateVariables, Template, TemplateVariable};
use crate::Parser;
use bibliographix::references::bib_reference::BibRef;
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
pub(crate) trait ParseInline {
fn parse_surrounded(&mut self, surrounding: &char) -> ParseResult<Vec<Inline>>;
fn parse_inline(&mut self) -> ParseResult<Inline>;
fn parse_image(&mut self) -> ParseResult<Image>;
fn parse_url(&mut self, short_syntax: bool) -> ParseResult<Url>;
fn parse_checkbox(&mut self) -> ParseResult<Checkbox>;
fn parse_bold(&mut self) -> ParseResult<BoldText>;
fn parse_italic(&mut self) -> ParseResult<ItalicText>;
fn parse_striked(&mut self) -> ParseResult<StrikedText>;
fn parse_math(&mut self) -> ParseResult<Math>;
fn parse_monospace(&mut self) -> ParseResult<MonospaceText>;
fn parse_underlined(&mut self) -> ParseResult<UnderlinedText>;
fn parse_superscript(&mut self) -> ParseResult<SuperscriptText>;
fn parse_emoji(&mut self) -> ParseResult<Emoji>;
fn parse_colored(&mut self) -> ParseResult<Colored>;
fn parse_bibref(&mut self) -> ParseResult<Arc<RwLock<BibReference>>>;
fn parse_template_variable(&mut self) -> ParseResult<Arc<RwLock<TemplateVariable>>>;
fn parse_plain(&mut self) -> ParseResult<PlainText>;
fn parse_inline_metadata(&mut self) -> ParseResult<InlineMetadata>;
fn parse_metadata_pair(&mut self) -> ParseResult<(String, MetadataValue)>;
fn parse_placeholder(&mut self) -> ParseResult<Arc<RwLock<Placeholder>>>;
fn parse_template(&mut self) -> ParseResult<Template>;
fn parse_character_code(&mut self) -> ParseResult<CharacterCode>;
}
impl ParseInline for Parser {
/// parses Inline surrounded by characters
fn parse_surrounded(&mut self, surrounding: &char) -> ParseResult<Vec<Inline>> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(surrounding, Some(start_index))?;
self.ctm.seek_one()?;
let mut inline = vec![self.parse_inline()?];
while !self.ctm.check_char(surrounding) {
if let Ok(result) = self.parse_inline() {
inline.push(result)
} else {
return Err(self.ctm.rewind_with_error(start_index));
}
}
if !self.ctm.check_eof() {
self.ctm.seek_one()?;
}
Ok(inline)
}
/// parses Inline, the formatting parts of a line (Text)
fn parse_inline(&mut self) -> ParseResult<Inline> {
if self.parse_variables {
if let Ok(var) = self.parse_template_variable() {
return Ok(Inline::TemplateVar(var));
}
}
if self.ctm.check_char(&PIPE) || self.ctm.check_char(&LB) {
Err(self.ctm.err())
} else if self.ctm.check_eof() {
Err(self.ctm.err())
} else if let Ok(image) = self.parse_image() {
Ok(Inline::Image(image))
} else if let Ok(url) = self.parse_url(false) {
Ok(Inline::Url(url))
} else if let Ok(pholder) = self.parse_placeholder() {
Ok(Inline::Placeholder(pholder))
} else if let Ok(bold) = self.parse_bold() {
Ok(Inline::Bold(bold))
} else if let Ok(italic) = self.parse_italic() {
Ok(Inline::Italic(italic))
} else if let Ok(under) = self.parse_underlined() {
Ok(Inline::Underlined(under))
} else if let Ok(mono) = self.parse_monospace() {
Ok(Inline::Monospace(mono))
} else if let Ok(striked) = self.parse_striked() {
Ok(Inline::Striked(striked))
} else if let Ok(superscript) = self.parse_superscript() {
Ok(Inline::Superscript(superscript))
} else if let Ok(checkbox) = self.parse_checkbox() {
Ok(Inline::Checkbox(checkbox))
} else if let Ok(emoji) = self.parse_emoji() {
Ok(Inline::Emoji(emoji))
} else if let Ok(colored) = self.parse_colored() {
Ok(Inline::Colored(colored))
} else if let Ok(bibref) = self.parse_bibref() {
Ok(Inline::BibReference(bibref))
} else if let Ok(math) = self.parse_math() {
Ok(Inline::Math(math))
} else if let Ok(char_code) = self.parse_character_code() {
Ok(Inline::CharacterCode(char_code))
} else {
Ok(Inline::Plain(self.parse_plain()?))
}
}
/// parses an image url
fn parse_image(&mut self) -> ParseResult<Image> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&IMG_START, Some(start_index))?;
self.ctm.seek_one()?;
if let Ok(url) = self.parse_url(true) {
let metadata = if let Ok(meta) = self.parse_inline_metadata() {
Some(meta)
} else {
None
};
Ok(Image { url, metadata })
} else {
Err(self.ctm.rewind_with_error(start_index))
}
}
// parses an url
fn parse_url(&mut self, short_syntax: bool) -> ParseResult<Url> {
let start_index = self.ctm.get_index();
let mut description = Vec::new();
if self.ctm.check_char(&DESC_OPEN) {
self.ctm.seek_one()?;
self.inline_break_at.push(DESC_CLOSE);
// only parse the description as inline if there is a description
if !self.ctm.check_char(&DESC_CLOSE) {
while let Ok(inline) = self.parse_inline() {
description.push(inline);
if self.ctm.check_char(&DESC_CLOSE) {
break;
}
}
}
self.inline_break_at.pop();
self.ctm.seek_one()?;
} else if !short_syntax {
return Err(self.ctm.rewind_with_error(start_index));
}
self.ctm.assert_char(&URL_OPEN, Some(start_index))?;
self.ctm.seek_one()?;
self.ctm.seek_any(&INLINE_WHITESPACE)?;
let mut url = self
.ctm
.get_string_until_any_or_rewind(&[URL_CLOSE], &[LB], start_index)?;
self.ctm.seek_one()?;
let url_path = self.transform_path(url.clone());
if url_path.exists() {
url = url_path.to_str().unwrap().to_string();
}
if description.len() > 0 {
Ok(Url::new(Some(description), url))
} else {
Ok(Url::new(None, url))
}
}
/// parses a markdown checkbox
fn parse_checkbox(&mut self) -> ParseResult<Checkbox> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&CHECK_OPEN, Some(start_index))?;
self.ctm.seek_one()?;
let checked = if self.ctm.check_char(&CHECK_CHECKED) {
true
} else if self.ctm.check_char(&SPACE) {
false
} else {
return Err(self.ctm.rewind_with_error(start_index));
};
self.ctm.seek_one()?;
self.ctm.assert_char(&CHECK_CLOSE, Some(start_index))?;
self.ctm.seek_one()?;
Ok(Checkbox { value: checked })
}
/// parses bold text with must start with two asterisks
fn parse_bold(&mut self) -> ParseResult<BoldText> {
let start_index = self.ctm.get_index();
self.ctm.assert_sequence(&BOLD, Some(start_index))?;
self.ctm.seek_one()?;
let mut inline = vec![self.parse_inline()?];
while !self.ctm.check_sequence(&BOLD) {
if let Ok(result) = self.parse_inline() {
inline.push(result);
} else {
return Err(self.ctm.rewind_with_error(start_index));
}
}
self.ctm.seek_one()?;
Ok(BoldText { value: inline })
}
fn parse_italic(&mut self) -> ParseResult<ItalicText> {
Ok(ItalicText {
value: self.parse_surrounded(&ITALIC)?,
})
}
fn parse_striked(&mut self) -> ParseResult<StrikedText> {
Ok(StrikedText {
value: self.parse_surrounded(&STRIKED)?,
})
}
fn parse_math(&mut self) -> ParseResult<Math> {
let start_index = self.ctm.get_index();
self.ctm.assert_sequence(&MATH_INLINE, Some(start_index))?;
self.ctm.seek_one()?;
let content = self
.ctm
.get_string_until_sequence(&[MATH_INLINE, &[LB]], &[])?;
self.ctm.seek_one()?;
Ok(Math {
expression: asciimath_rs::parse(content),
})
}
/// parses monospace text (inline-code) that isn't allowed to contain special characters
fn parse_monospace(&mut self) -> ParseResult<MonospaceText> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&BACKTICK, Some(start_index))?;
self.ctm.seek_one()?;
let content = self
.ctm
.get_string_until_any_or_rewind(&[BACKTICK, LB], &[], start_index)?;
self.ctm.assert_char(&BACKTICK, Some(start_index))?;
self.ctm.seek_one()?;
Ok(MonospaceText { value: content })
}
fn parse_underlined(&mut self) -> ParseResult<UnderlinedText> {
Ok(UnderlinedText {
value: self.parse_surrounded(&UNDERLINED)?,
})
}
fn parse_superscript(&mut self) -> ParseResult<SuperscriptText> {
Ok(SuperscriptText {
value: self.parse_surrounded(&SUPER)?,
})
}
fn parse_emoji(&mut self) -> ParseResult<Emoji> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&EMOJI, Some(start_index))?;
self.ctm.seek_one()?;
let name = self
.ctm
.get_string_until_any_or_rewind(&[EMOJI], &[SPACE, LB], start_index)?;
self.ctm.seek_one()?;
if let Some(emoji) = gh_emoji::get(name.as_str()) {
let emoji_char = *emoji.chars().collect::<Vec<char>>().first().unwrap();
Ok(Emoji {
value: emoji_char,
name,
})
} else {
Err(self.ctm.rewind_with_error(start_index))
}
}
/// parses colored text
fn parse_colored(&mut self) -> ParseResult<Colored> {
let start_index = self.ctm.get_index();
self.ctm
.assert_sequence(&SQ_COLOR_START, Some(start_index))?;
self.ctm.seek_one()?;
let color = self.ctm.get_string_until_any_or_rewind(
&[COLOR_CLOSE],
&[SPACE, LB, SEMICOLON],
start_index,
)?;
self.ctm.seek_one()?;
if color.is_empty() {
return Err(self.ctm.err());
}
Ok(Colored {
value: Box::new(self.parse_inline()?),
color,
})
}
fn parse_bibref(&mut self) -> ParseResult<Arc<RwLock<BibReference>>> {
let start_index = self.ctm.get_index();
self.ctm
.assert_sequence(&SQ_BIBREF_START, Some(start_index))?;
self.ctm.seek_one()?;
let key =
self.ctm
.get_string_until_any_or_rewind(&[BIBREF_CLOSE], &[SPACE, LB], start_index)?;
self.ctm.seek_one()?;
let bib_ref = BibRef::new(key.clone());
let ref_entry = Arc::new(RwLock::new(BibReference::new(
key,
self.document.config.get_ref_entry(BIB_REF_DISPLAY),
bib_ref.anchor(),
)));
self.document
.bibliography
.root_ref_anchor()
.lock()
.unwrap()
.insert(bib_ref);
Ok(ref_entry)
}
/// parses a template variable {prefix{name}suffix}
fn parse_template_variable(&mut self) -> ParseResult<Arc<RwLock<TemplateVariable>>> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&TEMP_VAR_OPEN, Some(start_index))?;
self.ctm.seek_one()?;
let prefix =
self.ctm
.get_string_until_any_or_rewind(&[TEMP_VAR_OPEN], &[LB], start_index)?;
self.ctm.seek_one()?;
let name =
self.ctm
.get_string_until_any_or_rewind(&[TEMP_VAR_CLOSE], &[LB], start_index)?;
self.ctm.seek_one()?;
let suffix =
self.ctm
.get_string_until_any_or_rewind(&[TEMP_VAR_CLOSE], &[LB], start_index)?;
self.ctm.seek_one()?;
Ok(Arc::new(RwLock::new(TemplateVariable {
value: None,
name,
prefix,
suffix,
})))
}
/// parses plain text as a string until it encounters an unescaped special inline char
fn parse_plain(&mut self) -> ParseResult<PlainText> {
if self.ctm.check_char(&LB) {
return Err(self.ctm.err());
}
let mut characters = String::new();
if !self.ctm.check_char(&SPECIAL_ESCAPE) {
characters.push(self.ctm.get_current());
}
while let Some(ch) = self.ctm.next_char() {
if self.ctm.check_any(&INLINE_SPECIAL_CHARS)
|| self.ctm.check_any(&self.inline_break_at)
|| (self.parse_variables && self.ctm.check_char(&TEMP_VAR_OPEN))
{
break;
}
if !self.ctm.check_char(&SPECIAL_ESCAPE) {
characters.push(ch)
}
}
if characters.len() > 0 {
Ok(PlainText { value: characters })
} else {
Err(self.ctm.err())
}
}
/// Parses metadata
fn parse_inline_metadata(&mut self) -> ParseResult<InlineMetadata> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&META_OPEN, Some(start_index))?;
self.ctm.seek_one()?;
let mut values = HashMap::new();
while let Ok((key, value)) = self.parse_metadata_pair() {
values.insert(key, value);
if self.ctm.check_char(&META_CLOSE) || self.ctm.check_char(&LB) {
// abort the parser of the inner content when encountering a closing tag or linebreak
break;
}
}
if self.ctm.check_char(&META_CLOSE) {
self.ctm.seek_one()?;
}
if values.len() == 0 {
// if there was a linebreak (the metadata wasn't closed) or there is no inner data
// return an error
return Err(self.ctm.rewind_with_error(start_index));
}
Ok(InlineMetadata { data: values })
}
/// parses a key-value metadata pair
fn parse_metadata_pair(&mut self) -> Result<(String, MetadataValue), ParseError> {
self.ctm.seek_any(&INLINE_WHITESPACE)?;
let name = self
.ctm
.get_string_until_any(&[META_CLOSE, EQ, SPACE, LB], &[])?;
self.ctm.seek_any(&INLINE_WHITESPACE)?;
let mut value = MetadataValue::Bool(true);
if self.ctm.check_char(&EQ) {
self.ctm.seek_one()?;
self.ctm.seek_any(&INLINE_WHITESPACE)?;
if let Ok(ph) = self.parse_placeholder() {
value = MetadataValue::Placeholder(ph);
} else if let Ok(template) = self.parse_template() {
value = MetadataValue::Template(template)
} else {
let quoted_string = self.ctm.check_any(&QUOTES);
let parse_until = if quoted_string {
let quote_start = self.ctm.get_current();
self.ctm.seek_one()?;
vec![quote_start, META_CLOSE, LB]
} else {
vec![META_CLOSE, LB, SPACE]
};
let raw_value = self.ctm.get_string_until_any(&parse_until, &[])?;
if self.ctm.check_any(&QUOTES) {
self.ctm.seek_one()?;
}
self.ctm.seek_any(&INLINE_WHITESPACE)?;
if self.ctm.check_char(&COMMA) {
self.ctm.seek_one()?;
}
value = if quoted_string {
MetadataValue::String(raw_value)
} else if raw_value.to_lowercase().as_str() == "true" {
MetadataValue::Bool(true)
} else if raw_value.to_lowercase().as_str() == "false" {
MetadataValue::Bool(false)
} else if let Ok(num) = raw_value.parse::<i64>() {
MetadataValue::Integer(num)
} else if let Ok(num) = raw_value.parse::<f64>() {
MetadataValue::Float(num)
} else {
MetadataValue::String(raw_value)
}
}
}
Ok((name, value))
}
/// parses a placeholder element
fn parse_placeholder(&mut self) -> ParseResult<Arc<RwLock<Placeholder>>> {
let start_index = self.ctm.get_index();
self.ctm.assert_sequence(&SQ_PHOLDER_START, None)?;
self.ctm.seek_one()?;
let name = if let Ok(name_str) = self
.ctm
.get_string_until_sequence(&[&SQ_PHOLDER_STOP], &[&[LB]])
{
name_str
} else {
return Err(self.ctm.rewind_with_error(start_index));
};
self.ctm.seek_one()?;
let metadata = if let Ok(meta) = self.parse_inline_metadata() {
Some(meta)
} else {
None
};
let placeholder = Arc::new(RwLock::new(Placeholder::new(name, metadata)));
self.document.add_placeholder(Arc::clone(&placeholder));
Ok(placeholder)
}
/// parses a template
fn parse_template(&mut self) -> ParseResult<Template> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&TEMPLATE, None)?;
self.ctm.seek_one()?;
if self.ctm.check_char(&TEMPLATE) {
return Err(self.ctm.rewind_with_error(start_index));
}
let mut elements = Vec::new();
self.block_break_at.push(TEMPLATE);
self.inline_break_at.push(TEMPLATE);
self.parse_variables = true;
while let Ok(e) = self.parse_block() {
elements.push(Element::Block(Box::new(e)));
if self.ctm.check_char(&TEMPLATE) {
break;
}
}
self.parse_variables = false;
self.block_break_at.clear();
self.inline_break_at.clear();
self.ctm.assert_char(&TEMPLATE, Some(start_index))?;
self.ctm.seek_one()?;
let vars: HashMap<String, Arc<RwLock<TemplateVariable>>> = elements
.iter()
.map(|e| e.get_template_variables())
.flatten()
.map(|e: Arc<RwLock<TemplateVariable>>| {
let name;
{
name = e.read().unwrap().name.clone();
};
(name, e)
})
.collect();
Ok(Template {
text: elements,
variables: vars,
})
}
/// parses a character code &code; like a html character code
fn parse_character_code(&mut self) -> ParseResult<CharacterCode> {
let start_index = self.ctm.get_index();
self.ctm.assert_char(&CHARACTER_START, None)?;
self.ctm.seek_one()?;
let code =
self.ctm
.get_string_until_any_or_rewind(&[CHARACTER_STOP], &[LB], start_index)?;
self.ctm.seek_one()?;
Ok(CharacterCode { code })
}
}