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node_modules/css-tree/lib/tokenizer/OffsetToLocation.js

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