ecmarkup/lib/formatter/line-builder.js

Custom element definitions and core utilities for markup that specifies ECMAScript and related technologies.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.LineBuilder = void 0;
/*
represents a sequences of lines, where the last line can have more text stuck on the end
squashes multiple consecutive blank lines and multiple consecutive spaces
*/
class LineBuilder {
    constructor(indent) {
        this.firstLineIsPartial = true;
        this.lines = [''];
        this.indent = indent;
    }
    append(other) {
        if (other.isEmpty()) {
            return;
        }
        if (this.isEmpty()) {
            this.firstLineIsPartial = other.firstLineIsPartial;
            this.lines = [...other.lines];
            return;
        }
        if (other.firstLineIsPartial) {
            if (this.last === '' &&
                other.lines.length > 1 &&
                other.lines[0] === '' &&
                other.lines[1] === '') {
                // max one blank line
                this.lines.pop();
            }
            else if (this.last.endsWith(' ') && other.lines[0].startsWith(' ')) {
                this.last = this.last.trimEnd();
            }
            this.appendText(other.lines[0], true); // we will already have stripped whitespace if we're supposed to do that
            this.lines = this.lines.concat(other.lines.slice(1));
        }
        else {
            this.last = this.last.trimEnd();
            if (this.last === '') {
                this.lines.pop();
            }
            if (this.last === '' && other.lines[0] === '') {
                this.lines.pop();
            }
            this.lines = this.lines.concat(other.lines);
        }
    }
    appendText(text, allowMultiSpace = false) {
        if (text === '') {
            return;
        }
        if (this.needsIndent()) {
            text = text.trimStart();
            if (text === '') {
                return;
            }
            this.last += '  '.repeat(this.indent);
        }
        this.last += allowMultiSpace ? text : text.replace(/  +/g, ' ');
    }
    appendLine(text, allowMultiSpace = false) {
        this.last = this.last.trimEnd();
        text = text.trim();
        if (text === '') {
            this.linebreak();
            return;
        }
        if (this.isEmpty()) {
            this.firstLineIsPartial = false;
        }
        else if (this.last !== '') {
            this.linebreak();
        }
        this.appendText(text, allowMultiSpace);
        this.linebreak();
    }
    linebreak() {
        if (this.isEmpty()) {
            this.firstLineIsPartial = false;
            return;
        }
        if (this.lines.length > 1 && this.lines[this.lines.length - 2] === '' && this.last === '') {
            // max one blank line
            return;
        }
        this.lines.push('');
    }
    isEmpty() {
        return this.firstLineIsPartial && this.lines.length === 1 && this.lines[0] === '';
    }
    trim() {
        this.firstLineIsPartial = true;
        while (this.lines.length > 1 && this.lines[0] === '') {
            this.lines.shift();
        }
        this.lines[0] = this.lines[0].trimStart();
        while (this.lines.length > 1 && this.last === '') {
            this.lines.pop();
        }
        this.last = this.last.trimEnd();
    }
    get last() {
        return this.lines[this.lines.length - 1];
    }
    set last(o) {
        this.lines[this.lines.length - 1] = o;
    }
    needsIndent() {
        if (this.firstLineIsPartial && this.lines.length === 1) {
            // when firstLineIsPartial, we don't indent the first line
            return false;
        }
        return /^ *$/.test(this.last);
    }
}
exports.LineBuilder = LineBuilder;