88 lines
2.3 KiB
JavaScript
88 lines
2.3 KiB
JavaScript
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import { adoptBuffer } from './adopt-buffer.js';
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import { isBOM } from './char-code-definitions.js';
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const N = 10;
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const F = 12;
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const R = 13;
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function computeLinesAndColumns(host) {
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const source = host.source;
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const sourceLength = source.length;
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const startOffset = source.length > 0 ? isBOM(source.charCodeAt(0)) : 0;
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const lines = adoptBuffer(host.lines, sourceLength);
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const columns = adoptBuffer(host.columns, sourceLength);
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let line = host.startLine;
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let column = host.startColumn;
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for (let i = startOffset; i < sourceLength; i++) {
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const code = source.charCodeAt(i);
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lines[i] = line;
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columns[i] = column++;
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if (code === N || code === R || code === F) {
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if (code === R && i + 1 < sourceLength && source.charCodeAt(i + 1) === N) {
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i++;
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lines[i] = line;
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columns[i] = column;
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}
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line++;
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column = 1;
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}
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}
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lines[sourceLength] = line;
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columns[sourceLength] = column;
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host.lines = lines;
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host.columns = columns;
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host.computed = true;
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}
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export class OffsetToLocation {
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constructor() {
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this.lines = null;
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this.columns = null;
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this.computed = false;
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}
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setSource(source, startOffset = 0, startLine = 1, startColumn = 1) {
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this.source = source;
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this.startOffset = startOffset;
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this.startLine = startLine;
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this.startColumn = startColumn;
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this.computed = false;
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}
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getLocation(offset, filename) {
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if (!this.computed) {
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computeLinesAndColumns(this);
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}
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return {
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source: filename,
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offset: this.startOffset + offset,
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line: this.lines[offset],
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column: this.columns[offset]
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};
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}
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getLocationRange(start, end, filename) {
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if (!this.computed) {
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computeLinesAndColumns(this);
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}
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return {
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source: filename,
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start: {
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offset: this.startOffset + start,
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line: this.lines[start],
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column: this.columns[start]
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},
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end: {
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offset: this.startOffset + end,
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line: this.lines[end],
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column: this.columns[end]
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}
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};
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}
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};
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