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enh(r) Add operators and punctuation #3195

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merged 12 commits into from May 19, 2021
Merged

enh(r) Add operators and punctuation #3195

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f6e5234
Add operators and punctuation to R
klmr May 18, 2021
9524023
Update src/languages/r.js
klmr May 18, 2021
4c746d9
Adjust pattern constant variable names
klmr May 18, 2021
684114d
Explain ^ use in regex
klmr May 18, 2021
f508d48
Give R a relevance boost from arrow-assign
klmr May 18, 2021
252483c
Separate hard to read punctuation regex
klmr May 18, 2021
c4d7b81
Document CHANGES
klmr May 18, 2021
bf1dc80
Make `<-` less of a signal boost for R
klmr May 19, 2021
cb7a392
Remove redundant declaration of assignment
klmr May 19, 2021
f165d24
Rebalance relevance of common syntactic constructs
klmr May 19, 2021
ea9e3ff
Document change to Vala detection
klmr May 19, 2021
3dc014c
Merge branch 'main' into r-punctuation
klmr May 19, 2021
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98 changes: 69 additions & 29 deletions src/languages/r.js
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Expand Up @@ -18,13 +18,20 @@ export default function(hljs) {
// handled in a separate mode. See `test/markup/r/names.txt` for examples.
// FIXME: Support Unicode identifiers.
const IDENT_RE = /(?:(?:[a-zA-Z]|\.[._a-zA-Z])[._a-zA-Z0-9]*)|\.(?!\d)/;
const SIMPLE_IDENT = /[a-zA-Z][a-zA-Z_0-9]*/;
const NUMBER_TYPES = regex.either(
// Special case: only hexadecimal binary powers can contain fractions
/0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*[pP][+-]?\d+i?/,
// Hexadecimal numbers without fraction and optional binary power
/0[xX][0-9a-fA-F]+(?:[pP][+-]?\d+)?[Li]?/,
// Decimal numbers
/(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?[Li]?/
);
const OPERATORS = /[=!<>:]=|\|\||&&|:::?|<-|<<-|->>|->|\|>|[-+*\/?!$&|:<=>@^~]|\*\*/;
const PUNCTUATION = /\[\[|[(){}[\]\\,]/;
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return {
name: 'R',

// only in Haskell, not R
illegal: /->/,
keywords: {
$pattern: IDENT_RE,
keyword:
Expand Down Expand Up @@ -56,6 +63,7 @@ export default function(hljs) {
'standardGeneric substitute sum switch tan tanh tanpi tracemem ' +
'trigamma trunc unclass untracemem UseMethod xtfrm',
},

contains: [
// Roxygen comments
hljs.COMMENT(
Expand All @@ -69,7 +77,7 @@ export default function(hljs) {
// preventing highlighting. This code is example R code, so nested
// doctags shouldn’t be treated as such. See
// `test/markup/r/roxygen.txt` for an example.
className: 'doctag',
scope: 'doctag',
begin: '@examples',
starts: {
contains: [
Expand All @@ -89,12 +97,12 @@ export default function(hljs) {
{
// Handle `@param` to highlight the parameter name following
// after.
className: 'doctag',
scope: 'doctag',
begin: '@param',
end: /$/,
contains: [
{
className: 'variable',
scope: 'variable',
variants: [
{ begin: IDENT_RE },
{ begin: /`(?:\\.|[^`\\])+`/ }
Expand All @@ -104,11 +112,11 @@ export default function(hljs) {
]
},
{
className: 'doctag',
scope: 'doctag',
begin: /@[a-zA-Z]+/
},
{
className: 'keyword',
scope: 'keyword',
begin: /\\[a-zA-Z]+/,
}
]
Expand All @@ -118,7 +126,7 @@ export default function(hljs) {
hljs.HASH_COMMENT_MODE,

{
className: 'string',
scope: 'string',
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contains: [hljs.BACKSLASH_ESCAPE],
variants: [
hljs.END_SAME_AS_BEGIN({ begin: /[rR]"(-*)\(/, end: /\)(-*)"/ }),
Expand All @@ -131,48 +139,80 @@ export default function(hljs) {
{begin: "'", end: "'", relevance: 0}
],
},

// Matching numbers immediately following punctuation and operators is
// tricky since we need to look at the character ahead of a number to
// ensure the number is not part of an identifier, and we cannot use
// negative look-behind assertions. So instead we explicitly handle all
// possible combinations of (operator|punctuation), number.
// TODO: replace with negative look-behind when available
// { begin: /(?<![a-zA-Z0-9._])0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*[pP][+-]?\d+i?/ },
// { begin: /(?<![a-zA-Z0-9._])0[xX][0-9a-fA-F]+([pP][+-]?\d+)?[Li]?/ },
// { begin: /(?<![a-zA-Z0-9._])(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?[Li]?/ }
{
relevance: 0,
className: {
2: "number"
},
variants: [
// TODO: replace with negative look-behind when available
// { begin: /(?<![a-zA-Z0-9._])0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*[pP][+-]?\d+i?/ },
// { begin: /(?<![a-zA-Z0-9._])0[xX][0-9a-fA-F]+([pP][+-]?\d+)?[Li]?/ },
// { begin: /(?<![a-zA-Z0-9._])(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?[Li]?/ }
{
// Special case: only hexadecimal binary powers can contain fractions.
scope: {
1: 'operator',
2: 'number'
},
match: [
/[^a-zA-Z0-9._]/, // not part of an identifier
/0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*[pP][+-]?\d+i?/
OPERATORS,
NUMBER_TYPES
]
},
{
scope: {
1: 'operator',
2: 'number'
},
match: [
/%[^%]*%/,
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NUMBER_TYPES
]
},
{
scope: {
1: 'punctuation',
2: 'number'
},
match: [
/[^a-zA-Z0-9._]/, // not part of an identifier
/0[xX][0-9a-fA-F]+(?:[pP][+-]?\d+)?[Li]?/
PUNCTUATION_RE,
NUMBER_TYPES_RE
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]
},
{
scope: { 2: 'number' },
relevance: 0,
match: [
/[^a-zA-Z0-9._]/, // not part of an identifier
/(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?[Li]?/
/[^a-zA-Z0-9._]|^/, // not part of an identifier
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NUMBER_TYPES
]
}
]
},

// Operators/punctuation when they're not directly followed by numbers
{
// infix operator
begin: '%',
end: '%'
scope: 'operator',
variants: [
{
relevance: 0,
match: OPERATORS
},
{ match: /%[^%]*%/ }
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]
},
// relevance boost for assignment

{
begin: regex.concat(SIMPLE_IDENT, "\\s+<-\\s+")
scope: 'punctuation',
relevance: 0,
match: PUNCTUATION
},

{
// escaped identifier
// Escaped identifier
begin: '`',
end: '`',
contains: [
Expand Down
12 changes: 6 additions & 6 deletions test/markup/r/names.expect.txt
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@@ -1,26 +1,26 @@
<span class="hljs-comment"># Valid names</span>

a1_foo, A1_FOO, .foo_, ._foo, Bar.42, foo..1, ., ._, .., ..., ..1, <span class="hljs-built_in">c</span>, <span class="hljs-built_in">T</span>, <span class="hljs-built_in">F</span>, ._1
a1_foo<span class="hljs-punctuation">,</span> A1_FOO<span class="hljs-punctuation">,</span> .foo_<span class="hljs-punctuation">,</span> ._foo<span class="hljs-punctuation">,</span> Bar.42<span class="hljs-punctuation">,</span> foo..1<span class="hljs-punctuation">,</span> .<span class="hljs-punctuation">,</span> ._<span class="hljs-punctuation">,</span> ..<span class="hljs-punctuation">,</span> ...<span class="hljs-punctuation">,</span> ..1<span class="hljs-punctuation">,</span> <span class="hljs-built_in">c</span><span class="hljs-punctuation">,</span> <span class="hljs-built_in">T</span><span class="hljs-punctuation">,</span> <span class="hljs-built_in">F</span><span class="hljs-punctuation">,</span> ._1
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Long-term I do worry this makes the tests much harder to read, but I don't have a quick solution.

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Yeah, it hasn’t been great during debugging. :-(

Maybe I should just replace the commas by spaces?

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Maybe. That wouldn't help in actual code examples though... :-)


<span class="hljs-comment"># Reserved Words</span>

<span class="hljs-literal">NA</span>, <span class="hljs-literal">NA_integer_</span>, <span class="hljs-literal">NA_real_</span>, <span class="hljs-literal">NA_character_</span>, <span class="hljs-literal">NA_complex_</span>, <span class="hljs-literal">NULL</span>, <span class="hljs-literal">NaN</span>, <span class="hljs-literal">Inf</span>
<span class="hljs-literal">NA</span><span class="hljs-punctuation">,</span> <span class="hljs-literal">NA_integer_</span><span class="hljs-punctuation">,</span> <span class="hljs-literal">NA_real_</span><span class="hljs-punctuation">,</span> <span class="hljs-literal">NA_character_</span><span class="hljs-punctuation">,</span> <span class="hljs-literal">NA_complex_</span><span class="hljs-punctuation">,</span> <span class="hljs-literal">NULL</span><span class="hljs-punctuation">,</span> <span class="hljs-literal">NaN</span><span class="hljs-punctuation">,</span> <span class="hljs-literal">Inf</span>

<span class="hljs-comment"># Keywords</span>

<span class="hljs-keyword">function</span>, <span class="hljs-keyword">while</span>, <span class="hljs-keyword">repeat</span>, <span class="hljs-keyword">for</span>, <span class="hljs-keyword">if</span>, <span class="hljs-keyword">in</span>, <span class="hljs-keyword">else</span>, <span class="hljs-keyword">next</span>, <span class="hljs-keyword">break</span>
<span class="hljs-keyword">function</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">while</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">repeat</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">for</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">if</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">in</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">else</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">next</span><span class="hljs-punctuation">,</span> <span class="hljs-keyword">break</span>

<span class="hljs-comment"># Not reserved</span>

NULLa, NULL1, NULL., `NULL`, <span class="hljs-string">&#x27;NULL&#x27;</span>, NA_foo_, na_real_, Function, for.
NULLa<span class="hljs-punctuation">,</span> NULL1<span class="hljs-punctuation">,</span> NULL.<span class="hljs-punctuation">,</span> `NULL`<span class="hljs-punctuation">,</span> <span class="hljs-string">&#x27;NULL&#x27;</span><span class="hljs-punctuation">,</span> NA_foo_<span class="hljs-punctuation">,</span> na_real_<span class="hljs-punctuation">,</span> Function<span class="hljs-punctuation">,</span> for.

<span class="hljs-comment"># Primitive built-ins</span>

<span class="hljs-built_in">return</span>, <span class="hljs-built_in">switch</span>, <span class="hljs-built_in">sum</span>
<span class="hljs-built_in">return</span><span class="hljs-punctuation">,</span> <span class="hljs-built_in">switch</span><span class="hljs-punctuation">,</span> <span class="hljs-built_in">sum</span>

<span class="hljs-comment"># Non-primitive base functions</span>

stop, try
stop<span class="hljs-punctuation">,</span> try

<span class="hljs-comment"># Quoted identifiers</span>

Expand Down
10 changes: 6 additions & 4 deletions test/markup/r/numbers.expect.txt
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@@ -1,18 +1,20 @@
<span class="hljs-number">1</span> <span class="hljs-comment"># Regression caused numbers at beginning not to be highlighted.</span>

<span class="hljs-comment"># Numbers</span>

<span class="hljs-number">0</span>, <span class="hljs-number">01</span>, <span class="hljs-number">08</span>, <span class="hljs-number">123456</span>, <span class="hljs-number">1256.701</span>, <span class="hljs-number">123e3</span>, <span class="hljs-number">123E+3</span>, <span class="hljs-number">1.23e-3</span>, <span class="hljs-number">1.23E3</span>, <span class="hljs-number">.25</span>, <span class="hljs-number">2.</span>
<span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-number">01</span><span class="hljs-punctuation">,</span> <span class="hljs-number">08</span><span class="hljs-punctuation">,</span> <span class="hljs-number">123456</span><span class="hljs-punctuation">,</span> <span class="hljs-number">1256.701</span><span class="hljs-punctuation">,</span> <span class="hljs-number">123e3</span><span class="hljs-punctuation">,</span> <span class="hljs-number">123E+3</span><span class="hljs-punctuation">,</span> <span class="hljs-number">1.23e-3</span><span class="hljs-punctuation">,</span> <span class="hljs-number">1.23E3</span><span class="hljs-punctuation">,</span> <span class="hljs-number">.25</span><span class="hljs-punctuation">,</span> <span class="hljs-number">2.</span>

<span class="hljs-comment"># Integers</span>

<span class="hljs-number">123L</span>, -<span class="hljs-number">50L</span>
<span class="hljs-number">123L</span><span class="hljs-punctuation">,</span> <span class="hljs-operator">-</span><span class="hljs-number">50L</span>

<span class="hljs-comment"># Imaginary numbers</span>

<span class="hljs-number">123i</span>, -<span class="hljs-number">123i</span>, <span class="hljs-number">1.2e-3i</span>, <span class="hljs-number">1.i</span>, <span class="hljs-number">.0i</span>
<span class="hljs-number">123i</span><span class="hljs-punctuation">,</span> <span class="hljs-operator">-</span><span class="hljs-number">123i</span><span class="hljs-punctuation">,</span> <span class="hljs-number">1.2e-3i</span><span class="hljs-punctuation">,</span> <span class="hljs-number">1.i</span><span class="hljs-punctuation">,</span> <span class="hljs-number">.0i</span>

<span class="hljs-comment"># Hex numbers</span>

<span class="hljs-number">0x0</span>, <span class="hljs-number">0xabcdefABCDEF01234</span>, <span class="hljs-number">0xabcp123</span>, <span class="hljs-number">0xabcP-123</span>, <span class="hljs-number">0x1.2p2</span>, <span class="hljs-number">0xa.bp-3i</span>
<span class="hljs-number">0x0</span><span class="hljs-punctuation">,</span> <span class="hljs-number">0xabcdefABCDEF01234</span><span class="hljs-punctuation">,</span> <span class="hljs-number">0xabcp123</span><span class="hljs-punctuation">,</span> <span class="hljs-number">0xabcP-123</span><span class="hljs-punctuation">,</span> <span class="hljs-number">0x1.2p2</span><span class="hljs-punctuation">,</span> <span class="hljs-number">0xa.bp-3i</span>

<span class="hljs-comment"># Invalid/not literals (for reference)</span>

Expand Down
2 changes: 2 additions & 0 deletions test/markup/r/numbers.txt
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@@ -1,3 +1,5 @@
1 # Regression caused numbers at beginning not to be highlighted.

# Numbers

0, 01, 08, 123456, 1256.701, 123e3, 123E+3, 1.23e-3, 1.23E3, .25, 2.
Expand Down