sql-formatter/dist/esm/formatter/InlineLayout.js

Format whitespace in a SQL query to make it more readable

// eslint-disable-next-line max-classes-per-file
import Indentation from './Indentation.js';
import Layout, { WS } from './Layout.js';
/**
 * Like Layout, but only formats single-line expressions.
 *
 * Throws InlineLayoutError:
 * - when encountering a newline
 * - when exceeding configured expressionWidth
 */
export default class InlineLayout extends Layout {
    constructor(expressionWidth) {
        super(new Indentation('')); // no indentation in inline layout
        this.expressionWidth = expressionWidth;
        this.length = 0;
        // Keeps track of the trailing whitespace,
        // so that we can decrease length when encountering WS.NO_SPACE,
        // but only when there actually is a space to remove.
        this.trailingSpace = false;
    }
    add(...items) {
        items.forEach(item => this.addToLength(item));
        if (this.length > this.expressionWidth) {
            // We have exceeded the allowable width
            throw new InlineLayoutError();
        }
        super.add(...items);
    }
    addToLength(item) {
        if (typeof item === 'string') {
            this.length += item.length;
            this.trailingSpace = false;
        }
        else if (item === WS.MANDATORY_NEWLINE || item === WS.NEWLINE) {
            // newlines not allowed within inline block
            throw new InlineLayoutError();
        }
        else if (item === WS.INDENT || item === WS.SINGLE_INDENT || item === WS.SPACE) {
            if (!this.trailingSpace) {
                this.length++;
                this.trailingSpace = true;
            }
        }
        else if (item === WS.NO_NEWLINE || item === WS.NO_SPACE) {
            if (this.trailingSpace) {
                this.trailingSpace = false;
                this.length--;
            }
        }
    }
}
/**
 * Thrown when block of SQL can't be formatted as a single line.
 */
export class InlineLayoutError extends Error {
}
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