overleaf/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs

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/* Hand-written tokenizer for LaTeX. */
import { ExternalTokenizer, ContextTracker } from '@lezer/lr'
import {
LiteralArgContent,
SpaceDelimitedLiteralArgContent,
VerbContent,
VerbatimContent,
LstInlineContent,
Begin,
End,
KnownEnvironment,
Csname,
TrailingWhitespaceOnly,
TrailingContent,
RefCtrlSeq,
RefStarrableCtrlSeq,
CiteCtrlSeq,
CiteStarrableCtrlSeq,
LabelCtrlSeq,
MathTextCtrlSeq,
HboxCtrlSeq,
TitleCtrlSeq,
AuthorCtrlSeq,
AffilCtrlSeq,
AffiliationCtrlSeq,
DocumentClassCtrlSeq,
UsePackageCtrlSeq,
HrefCtrlSeq,
UrlCtrlSeq,
VerbCtrlSeq,
LstInlineCtrlSeq,
IncludeGraphicsCtrlSeq,
CaptionCtrlSeq,
DefCtrlSeq,
LeftCtrlSeq,
RightCtrlSeq,
NewCommandCtrlSeq,
RenewCommandCtrlSeq,
NewEnvironmentCtrlSeq,
RenewEnvironmentCtrlSeq,
DocumentEnvName,
TabularEnvName,
EquationEnvName,
EquationArrayEnvName,
VerbatimEnvName,
TikzPictureEnvName,
FigureEnvName,
OpenParenCtrlSym,
CloseParenCtrlSym,
OpenBracketCtrlSym,
CloseBracketCtrlSym,
LineBreakCtrlSym,
// Sectioning commands
BookCtrlSeq,
PartCtrlSeq,
ChapterCtrlSeq,
SectionCtrlSeq,
SubSectionCtrlSeq,
SubSubSectionCtrlSeq,
ParagraphCtrlSeq,
SubParagraphCtrlSeq,
InputCtrlSeq,
IncludeCtrlSeq,
ItemCtrlSeq,
NewTheoremCtrlSeq,
TheoremStyleCtrlSeq,
BibliographyCtrlSeq,
BibliographyStyleCtrlSeq,
CenteringCtrlSeq,
ListEnvName,
MaketitleCtrlSeq,
TextColorCtrlSeq,
ColorBoxCtrlSeq,
HLineCtrlSeq,
TopRuleCtrlSeq,
MidRuleCtrlSeq,
BottomRuleCtrlSeq,
TableEnvName,
MultiColumnCtrlSeq,
ParBoxCtrlSeq,
// Marker for end of argument lists
endOfArguments,
hasMoreArguments,
hasMoreArgumentsOrOptionals,
endOfArgumentsAndOptionals,
} from './latex.terms.mjs'
const MAX_ARGUMENT_LOOKAHEAD = 100
function nameChar(ch) {
// we accept A-Z a-z 0-9 * + @ in environment names
return (
(ch >= 65 && ch <= 90) ||
(ch >= 97 && ch <= 122) ||
(ch >= 48 && ch <= 57) ||
ch === 42 ||
ch === 43 ||
ch === 64
)
}
// match [a-zA-Z]
function alphaChar(ch) {
return (ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122)
}
let cachedName = null
let cachedInput = null
let cachedPos = 0
function envNameAfter(input, offset) {
const pos = input.pos + offset
if (cachedInput === input && cachedPos === pos) {
return cachedName
}
if (input.peek(offset) !== '{'.charCodeAt(0)) return
offset++
let name = ''
for (;;) {
const next = input.peek(offset)
if (!nameChar(next)) break
name += String.fromCharCode(next)
offset++
}
cachedInput = input
cachedPos = pos
return (cachedName = name || null)
}
function ElementContext(name, parent) {
this.name = name
this.parent = parent
this.hash = parent ? parent.hash : 0
for (let i = 0; i < name.length; i++)
this.hash +=
(this.hash << 4) + name.charCodeAt(i) + (name.charCodeAt(i) << 8)
}
export const elementContext = new ContextTracker({
start: null,
shift(context, term, stack, input) {
return term === Begin
? new ElementContext(envNameAfter(input, '\\begin'.length) || '', context)
: context
},
reduce(context, term) {
return term === KnownEnvironment && context ? context.parent : context
},
reuse(context, node, _stack, input) {
const type = node.type.id
return type === Begin
? new ElementContext(envNameAfter(input, 0) || '', context)
: context
},
hash(context) {
return context ? context.hash : 0
},
strict: false,
})
// tokenizer for \verb|...| commands
export const verbTokenizer = new ExternalTokenizer(
(input, stack) => {
if (input.next === '*'.charCodeAt(0)) input.advance()
const delimiter = input.next
if (delimiter === -1) return // hit end of file
if (/\s|\*/.test(String.fromCharCode(delimiter))) return // invalid delimiter
input.advance()
for (;;) {
const next = input.next
if (next === -1 || next === CHAR_NEWLINE) return
input.advance()
if (next === delimiter) break
}
return input.acceptToken(VerbContent)
},
{ contextual: false }
)
// tokenizer for \lstinline|...| commands
export const lstinlineTokenizer = new ExternalTokenizer(
(input, stack) => {
let delimiter = input.next
if (delimiter === -1) return // hit end of file
if (/\s/.test(String.fromCharCode(delimiter))) {
return // invalid delimiter
}
if (delimiter === CHAR_OPEN_BRACE) {
delimiter = CHAR_CLOSE_BRACE
}
input.advance()
for (;;) {
const next = input.next
if (next === -1 || next === CHAR_NEWLINE) return
input.advance()
if (next === delimiter) break
}
return input.acceptToken(LstInlineContent)
},
{ contextual: false }
)
const matchForward = (input, expected, offset = 0) => {
for (let i = 0; i < expected.length; i++) {
if (String.fromCharCode(input.peek(offset + i)) !== expected[i]) {
return false
}
}
return true
}
// tokenizer for \begin{verbatim}...\end{verbatim} environments
export const verbatimTokenizer = new ExternalTokenizer(
(input, stack) => {
const delimiter = '\\end{' + stack.context.name + '}'
for (let offset = 0; ; offset++) {
const next = input.peek(offset)
if (next === -1 || matchForward(input, delimiter, offset)) {
return input.acceptToken(VerbatimContent, offset)
}
}
},
{ contextual: false }
)
// tokenizer for \href{...} and similar commands
export const literalArgTokenizer = new ExternalTokenizer(
input => {
for (let offset = 0; ; offset++) {
const next = input.peek(offset)
if (next === -1 || next === CHAR_CLOSE_BRACE) {
return input.acceptToken(LiteralArgContent, offset)
}
}
},
{ contextual: false }
)
// tokenizer for literal content delimited by whitespace, such as in `\input foo.tex`
export const spaceDelimitedLiteralArgTokenizer = new ExternalTokenizer(
input => {
for (let offset = 0; ; offset++) {
const next = input.peek(offset)
if (next === -1 || next === CHAR_SPACE || next === CHAR_NEWLINE) {
return input.acceptToken(SpaceDelimitedLiteralArgContent, offset)
}
}
},
{ contextual: false }
)
// helper function to look up charCodes
function _char(s) {
return s.charCodeAt(0)
}
const CHAR_BACKSLASH = _char('\\')
const CHAR_OPEN_BRACE = _char('{')
const CHAR_OPEN_BRACKET = _char('[')
const CHAR_CLOSE_BRACE = _char('}')
const CHAR_TAB = _char('\t')
const CHAR_SPACE = _char(' ')
const CHAR_NEWLINE = _char('\n')
const lookaheadTokenizer = getToken =>
new ExternalTokenizer(
input => {
for (let i = 0; i < MAX_ARGUMENT_LOOKAHEAD; ++i) {
const next = input.peek(i)
if (next === CHAR_SPACE || next === CHAR_TAB) {
continue
}
const token = getToken(next)
if (token) {
input.acceptToken(token)
return
}
}
},
{ contextual: false, fallback: true }
)
export const argumentListTokenizer = lookaheadTokenizer(next => {
if (next === CHAR_OPEN_BRACE) {
return hasMoreArguments
} else {
return endOfArguments
}
})
export const argumentListWithOptionalTokenizer = lookaheadTokenizer(next => {
if (next === CHAR_OPEN_BRACE || next === CHAR_OPEN_BRACKET) {
return hasMoreArgumentsOrOptionals
} else {
return endOfArgumentsAndOptionals
}
})
const CHAR_AT_SYMBOL = _char('@')
export const csnameTokenizer = new ExternalTokenizer((input, stack) => {
let offset = 0
let end = -1
// look at the first character, we are looking for acceptable control sequence names
// including @ signs, \\[a-zA-Z@]+
const next = input.peek(offset)
if (next === -1) {
return
}
// reject anything not starting with a backslash,
// we only accept control sequences
if (next !== CHAR_BACKSLASH) {
return
}
offset++
for (;;) {
const next = input.peek(offset)
// stop when we reach the end of file or a non-csname character
if (next === -1 || !(alphaChar(next) || next === CHAR_AT_SYMBOL)) {
end = offset - 1
break
}
end = offset
offset++
}
if (end === -1) return
// accept the content as a valid control sequence
return input.acceptToken(Csname, end + 1)
})
const END_DOCUMENT_MARK = '\\end{document}'.split('').reverse()
export const trailingContentTokenizer = new ExternalTokenizer(
(input, stack) => {
if (input.next === -1) return // no trailing content
// Look back for end-document mark, bail out if any characters do not match
for (let i = 1; i < END_DOCUMENT_MARK.length + 1; i++) {
if (String.fromCharCode(input.peek(-i)) !== END_DOCUMENT_MARK[i - 1]) {
return
}
}
while (input.next === CHAR_SPACE || input.next === CHAR_NEWLINE) {
const next = input.advance()
if (next === -1) return input.acceptToken(TrailingWhitespaceOnly) // trailing whitespace only
}
// accept the all content up to the end of the document
while (input.advance() !== -1) {
//
}
return input.acceptToken(TrailingContent)
}
)
const refCommands = new Set([
'\\fullref',
'\\Vref',
'\\autopageref',
'\\autoref',
'\\eqref',
'\\labelcpageref',
'\\labelcref',
'\\lcnamecref',
'\\lcnamecrefs',
'\\namecref',
'\\nameCref',
'\\namecrefs',
'\\nameCrefs',
'\\thnameref',
'\\thref',
'\\titleref',
'\\vrefrange',
'\\Crefrange',
'\\Crefrang',
'\\fref',
'\\pref',
'\\tref',
'\\Aref',
'\\Bref',
'\\Pref',
'\\Sref',
'\\vref',
'\\nameref',
])
const refStarrableCommands = new Set([
'\\vpageref',
'\\vref',
'\\zcpageref',
'\\zcref',
'\\zfullref',
'\\zref',
'\\zvpageref',
'\\zvref',
'\\cref',
'\\Cref',
'\\pageref',
'\\ref',
'\\Ref',
'\\subref',
'\\zpageref',
'\\ztitleref',
'\\vpagerefrange',
'\\zvpagerefrange',
'\\zvrefrange',
'\\crefrange',
])
const citeCommands = new Set([
'\\autocites',
'\\Autocites',
'\\Cite',
'\\citeA',
'\\citealp',
'\\Citealp',
'\\citealt',
'\\Citealt',
'\\citeauthorNP',
'\\citeauthorp',
'\\Citeauthorp',
'\\citeauthort',
'\\Citeauthort',
'\\citeNP',
'\\citenum',
'\\citen',
'\\citeonline',
'\\cites',
'\\Cites',
'\\citeurl',
'\\citeyearpar',
'\\defcitealias',
'\\fnotecite',
'\\footcite',
'\\footcitetext',
'\\footfullcite',
'\\footnotecites',
'\\Footnotecites',
'\\fullcite',
'\\fullciteA',
'\\fullciteauthor',
'\\fullciteauthorNP',
'\\maskcite',
'\\maskciteA',
'\\maskcitealp',
'\\maskCitealp',
'\\maskcitealt',
'\\maskCitealt',
'\\maskciteauthor',
'\\maskciteauthorNP',
'\\maskciteauthorp',
'\\maskCiteauthorp',
'\\maskciteauthort',
'\\maskCiteauthort',
'\\maskciteNP',
'\\maskcitenum',
'\\maskcitep',
'\\maskCitep',
'\\maskcitepalias',
'\\maskcitet',
'\\maskCitet',
'\\maskcitetalias',
'\\maskciteyear',
'\\maskciteyearNP',
'\\maskciteyearpar',
'\\maskfullcite',
'\\maskfullciteA',
'\\maskfullciteauthor',
'\\maskfullciteauthorNP',
'\\masknocite',
'\\maskshortcite',
'\\maskshortciteA',
'\\maskshortciteauthor',
'\\maskshortciteauthorNP',
'\\maskshortciteNP',
'\\mautocite',
'\\Mautocite',
'\\mcite',
'\\Mcite',
'\\mfootcite',
'\\mfootcitetext',
'\\mparencite',
'\\Mparencite',
'\\msupercite',
'\\mtextcite',
'\\Mtextcite',
'\\nocite',
'\\nocitemeta',
'\\notecite',
'\\Parencite',
'\\parencites',
'\\Parencites',
'\\pnotecite',
'\\shortcite',
'\\shortciteA',
'\\shortciteauthor',
'\\shortciteauthorNP',
'\\shortciteNP',
'\\smartcite',
'\\Smartcite',
'\\smartcites',
'\\Smartcites',
'\\supercite',
'\\supercites',
'\\textcite',
'\\Textcite',
'\\textcites',
'\\Textcites',
])
const citeStarredCommands = new Set([
'\\cite',
'\\citeauthor',
'\\Citeauthor',
'\\citedate',
'\\citep',
'\\citepalias',
'\\Citep',
'\\citetitle',
'\\citeyear',
'\\parencite',
'\\citet',
'\\citetalias',
'\\autocite',
'\\Autocite',
])
const labelCommands = new Set(['\\label', '\\thlabel', '\\zlabel'])
const mathTextCommands = new Set(['\\text', '\\tag', '\\textrm', '\\intertext'])
const otherKnowncommands = {
'\\hbox': HboxCtrlSeq,
'\\title': TitleCtrlSeq,
'\\author': AuthorCtrlSeq,
'\\affil': AffilCtrlSeq,
'\\affiliation': AffiliationCtrlSeq,
'\\documentclass': DocumentClassCtrlSeq,
'\\usepackage': UsePackageCtrlSeq,
'\\href': HrefCtrlSeq,
'\\url': UrlCtrlSeq,
'\\verb': VerbCtrlSeq,
'\\lstinline': LstInlineCtrlSeq,
'\\includegraphics': IncludeGraphicsCtrlSeq,
'\\caption': CaptionCtrlSeq,
'\\def': DefCtrlSeq,
'\\left': LeftCtrlSeq,
'\\right': RightCtrlSeq,
'\\newcommand': NewCommandCtrlSeq,
'\\renewcommand': RenewCommandCtrlSeq,
'\\newenvironment': NewEnvironmentCtrlSeq,
'\\renewenvironment': RenewEnvironmentCtrlSeq,
'\\book': BookCtrlSeq,
'\\part': PartCtrlSeq,
'\\addpart': PartCtrlSeq,
'\\chapter': ChapterCtrlSeq,
'\\addchap': ChapterCtrlSeq,
'\\section': SectionCtrlSeq,
'\\addseq': SectionCtrlSeq,
'\\subsection': SubSectionCtrlSeq,
'\\subsubsection': SubSubSectionCtrlSeq,
'\\paragraph': ParagraphCtrlSeq,
'\\subparagraph': SubParagraphCtrlSeq,
'\\input': InputCtrlSeq,
'\\include': IncludeCtrlSeq,
'\\item': ItemCtrlSeq,
'\\centering': CenteringCtrlSeq,
'\\newtheorem': NewTheoremCtrlSeq,
'\\theoremstyle': TheoremStyleCtrlSeq,
'\\bibliography': BibliographyCtrlSeq,
'\\bibliographystyle': BibliographyStyleCtrlSeq,
'\\maketitle': MaketitleCtrlSeq,
'\\textcolor': TextColorCtrlSeq,
'\\colorbox': ColorBoxCtrlSeq,
'\\hline': HLineCtrlSeq,
'\\toprule': TopRuleCtrlSeq,
'\\midrule': MidRuleCtrlSeq,
'\\bottomrule': BottomRuleCtrlSeq,
'\\multicolumn': MultiColumnCtrlSeq,
'\\parbox': ParBoxCtrlSeq,
}
// specializer for control sequences
// return new tokens for specific control sequences
export const specializeCtrlSeq = (name, terms) => {
if (name === '\\begin') return Begin
if (name === '\\end') return End
if (refCommands.has(name)) {
return RefCtrlSeq
}
if (refStarrableCommands.has(name)) {
return RefStarrableCtrlSeq
}
if (citeCommands.has(name)) {
return CiteCtrlSeq
}
if (citeStarredCommands.has(name)) {
return CiteStarrableCtrlSeq
}
if (labelCommands.has(name)) {
return LabelCtrlSeq
}
if (mathTextCommands.has(name)) {
return MathTextCtrlSeq
}
return otherKnowncommands[name] || -1
}
const tabularEnvNames = new Set([
'tabular',
'xltabular',
'tabularx',
'longtable',
])
const equationEnvNames = new Set([
'equation',
'equation*',
'displaymath',
'displaymath*',
'math',
'math*',
'multline',
'multline*',
'matrix',
'tikzcd',
])
const equationArrayEnvNames = new Set([
'array',
'eqnarray',
'eqnarray*',
'align',
'align*',
'alignat',
'alignat*',
'flalign',
'flalign*',
'gather',
'gather*',
'pmatrix',
'pmatrix*',
'bmatrix',
'bmatrix*',
'Bmatrix',
'Bmatrix*',
'vmatrix',
'vmatrix*',
'Vmatrix',
'Vmatrix*',
'smallmatrix',
'smallmatrix*',
'split',
'split*',
'gathered',
'gathered*',
'aligned',
'aligned*',
'alignedat',
'alignedat*',
'cases',
'cases*',
'dcases',
'dcases*',
'rcases',
'rcases*',
'IEEEeqnarray',
'IEEEeqnarray*',
])
const verbatimEnvNames = new Set([
'verbatim',
'boxedverbatim',
'lstlisting',
'minted',
'Verbatim',
'lstlisting',
'codeexample',
'comment',
])
const otherKnownEnvNames = {
document: DocumentEnvName,
tikzpicture: TikzPictureEnvName,
figure: FigureEnvName,
'figure*': FigureEnvName,
subfigure: FigureEnvName,
enumerate: ListEnvName,
itemize: ListEnvName,
table: TableEnvName,
description: ListEnvName,
}
export const specializeEnvName = (name, terms) => {
if (tabularEnvNames.has(name)) {
return TabularEnvName
}
if (equationEnvNames.has(name)) {
return EquationEnvName
}
if (equationArrayEnvNames.has(name)) {
return EquationArrayEnvName
}
if (verbatimEnvNames.has(name)) {
return VerbatimEnvName
}
return otherKnownEnvNames[name] || -1
}
const otherKnownCtrlSyms = {
'\\(': OpenParenCtrlSym,
'\\)': CloseParenCtrlSym,
'\\[': OpenBracketCtrlSym,
'\\]': CloseBracketCtrlSym,
'\\\\': LineBreakCtrlSym,
}
export const specializeCtrlSym = (name, terms) => {
return otherKnownCtrlSyms[name] || -1
}