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[READ-ONLY] Mirror of https://github.com/flo-bit/shapecraft. flo-bit.dev/shapecraft
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4.4 kB · 156 lines
JavaScript
at commit da69385e
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const PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+)const HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-)const QUESTIONMARK = 0x003F; // U+003F QUESTION MARK (?)
function eatHexSequence(offset, allowDash) { let len = 0;
for (let pos = this.tokenStart + offset; pos < this.tokenEnd; pos++) { const code = this.charCodeAt(pos);
if (code === HYPHENMINUS && allowDash && len !== 0) { eatHexSequence.call(this, offset + len + 1, false); return -1; }
if (!isHexDigit(code)) { this.error( allowDash && len !== 0 ? 'Hyphen minus' + (len < 6 ? ' or hex digit' : '') + ' is expected' : (len < 6 ? 'Hex digit is expected' : 'Unexpected input'), pos ); }
if (++len > 6) { this.error('Too many hex digits', pos); }; }
this.next(); return len;}
function eatQuestionMarkSequence(max) { let count = 0;
while (this.isDelim(QUESTIONMARK)) { if (++count > max) { this.error('Too many question marks'); }
this.next(); }}
function startsWith(code) { if (this.charCodeAt(this.tokenStart) !== code) { this.error((code === PLUSSIGN ? 'Plus sign' : 'Hyphen minus') + ' is expected'); }}
// https://drafts.csswg.org/css-syntax/#urange// Informally, the <urange> production has three forms:// U+0001// Defines a range consisting of a single code point, in this case the code point "1".// U+0001-00ff// Defines a range of codepoints between the first and the second value, in this case// the range between "1" and "ff" (255 in decimal) inclusive.// U+00??// Defines a range of codepoints where the "?" characters range over all hex digits,// in this case defining the same as the value U+0000-00ff.// In each form, a maximum of 6 digits is allowed for each hexadecimal number (if you treat "?" as a hexadecimal digit).//// <urange> =// u '+' <ident-token> '?'* |// u <dimension-token> '?'* |// u <number-token> '?'* |// u <number-token> <dimension-token> |// u <number-token> <number-token> |// u '+' '?'+function scanUnicodeRange() { let hexLength = 0;
switch (this.tokenType) { case Number: // u <number-token> '?'* // u <number-token> <dimension-token> // u <number-token> <number-token> hexLength = eatHexSequence.call(this, 1, true);
if (this.isDelim(QUESTIONMARK)) { eatQuestionMarkSequence.call(this, 6 - hexLength); break; }
if (this.tokenType === Dimension || this.tokenType === Number) { startsWith.call(this, HYPHENMINUS); eatHexSequence.call(this, 1, false); break; }
break;
case Dimension: // u <dimension-token> '?'* hexLength = eatHexSequence.call(this, 1, true);
if (hexLength > 0) { eatQuestionMarkSequence.call(this, 6 - hexLength); }
break;
default: // u '+' <ident-token> '?'* // u '+' '?'+ this.eatDelim(PLUSSIGN);
if (this.tokenType === Ident) { hexLength = eatHexSequence.call(this, 0, true); if (hexLength > 0) { eatQuestionMarkSequence.call(this, 6 - hexLength); } break; }
if (this.isDelim(QUESTIONMARK)) { this.next(); eatQuestionMarkSequence.call(this, 5); break; }
this.error('Hex digit or question mark is expected'); }}
export const name = 'UnicodeRange';export const structure = { value: String};
export function parse() { const start = this.tokenStart;
// U or u this.eatIdent('u'); scanUnicodeRange.call(this);
return { type: 'UnicodeRange', loc: this.getLocation(start, this.tokenStart), value: this.substrToCursor(start) };}
export function generate(node) { this.tokenize(node.value);}