mirror of https://github.com/vuejs/core.git
51 lines
1.1 KiB
TypeScript
51 lines
1.1 KiB
TypeScript
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import { SourceLocation, Position } from './ast'
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export function getInnerRange(
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loc: SourceLocation,
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offset: number,
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length?: number
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): SourceLocation {
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const source = loc.source.substr(offset, length)
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const newLoc: SourceLocation = {
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source,
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start: advancePositionBy(loc.start, loc.source, offset),
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end: loc.end
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}
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if (length != null) {
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newLoc.end = advancePositionBy(loc.start, loc.source, offset + length)
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}
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return newLoc
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}
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export function advancePositionBy(
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pos: Position,
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source: string,
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numberOfCharacters: number
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): Position {
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__DEV__ && assert(numberOfCharacters <= source.length)
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const newPosition = {
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...pos
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}
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const str = source.slice(0, numberOfCharacters)
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const lines = str.split(/\r?\n/)
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newPosition.offset += numberOfCharacters
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newPosition.line += lines.length - 1
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newPosition.column =
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lines.length === 1
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? pos.column + numberOfCharacters
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: Math.max(1, lines.pop()!.length)
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return newPosition
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}
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export function assert(condition: boolean, msg?: string) {
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if (!condition) {
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throw new Error(msg || `unexpected parser condition`)
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}
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}
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