@specs-feup/lara/api/lara/util/LineInserter.js

A js port of the popular framework for building source-to-source compilers

import LineIterator from "../iterators/LineIterator.js";
/**
 * Helps inserting lines.
 *
 */
export default class LineInserter {
    // TODO: Use system newline? Allow user to change newline?
    newLine = "\n";
    /**
     * Sets the new line.
     *
     * @param newLine - the new line to use.
     */
    setNewLine(newLine) {
        this.newLine = newLine;
    }
    /**
     *
     * @param contents - The contents where lines will be inserted.
     * @param linesToInsert - Maps line numbers to strings to insert.
     *
     * @returns the contents with the lines inserted.
     */
    add(contents, linesToInsert) {
        const lineIterator = new LineIterator(contents);
        let newContents = "";
        let currentLine = 0;
        while (lineIterator.hasNext()) {
            const line = lineIterator.next();
            currentLine++;
            // Check if there is a mapping for the current line
            const toInsert = linesToInsert[currentLine];
            if (toInsert !== undefined) {
                if (Array.isArray(toInsert)) {
                    newContents += toInsert.join(this.newLine) + this.newLine;
                }
                else {
                    newContents += toInsert + this.newLine;
                }
            }
            // Insert old content
            newContents += line + this.newLine;
        }
        return newContents;
    }
}
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