You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43 lines
1.0 KiB
JavaScript
43 lines
1.0 KiB
JavaScript
import {lineBreakG} from "./whitespace"
|
|
|
|
// These are used when `options.locations` is on, for the
|
|
// `startLoc` and `endLoc` properties.
|
|
|
|
export class Position {
|
|
constructor(line, col) {
|
|
this.line = line
|
|
this.column = col
|
|
}
|
|
|
|
offset(n) {
|
|
return new Position(this.line, this.column + n)
|
|
}
|
|
}
|
|
|
|
export class SourceLocation {
|
|
constructor(p, start, end) {
|
|
this.start = start
|
|
this.end = end
|
|
if (p.sourceFile !== null) this.source = p.sourceFile
|
|
}
|
|
}
|
|
|
|
// The `getLineInfo` function is mostly useful when the
|
|
// `locations` option is off (for performance reasons) and you
|
|
// want to find the line/column position for a given character
|
|
// offset. `input` should be the code string that the offset refers
|
|
// into.
|
|
|
|
export function getLineInfo(input, offset) {
|
|
for (let line = 1, cur = 0;;) {
|
|
lineBreakG.lastIndex = cur
|
|
let match = lineBreakG.exec(input)
|
|
if (match && match.index < offset) {
|
|
++line
|
|
cur = match.index + match[0].length
|
|
} else {
|
|
return new Position(line, offset - cur)
|
|
}
|
|
}
|
|
}
|