class SourceLocation {
// not sure what is a lexer. a regex? or a token value?
constructor(lexer, start, end) {
this.lexer = lexer;
this.start = start;
this.end = end;
}
// SourceLocation.range({loc: {lexer: 'al', start: 3}}, {loc: {lexer: 'al', end: 10}})
// => SourceLocation {end: 10, lexer: "al", start: 3}
static range( first, second) { // first and second are both Tokens.
// { text: 'albert', loc: new SourceLocation() }
if (!second) {
return first && first.loc;
} else if (!first || !first.loc || !second.loc ||
first.loc.lexer !== second.loc.lexer) {
return null;
} else {
return new SourceLocation(
first.loc.lexer, first.loc.start, second.loc.end);
}
}
}
module.exports = {SourceLocation}