Class Parser

packages/core/css-value/reworkcss-value.ts:41–131

}

class Parser {
	private str: string;

	constructor(str: string) {
		this.str = str;
	}

	private skip(match: RegExpExecArray): void {
		this.str = this.str.slice(match[0].length);
	}

	/** Comma tokens: "," */
	private comma(): CommaToken | undefined {
		const m = /^, */.exec(this.str);
		if (!m) return;
		this.skip(m);
		return { type: 'comma', string: ',' };
	}

	/** Identifier tokens: word or dash sequences */
	private ident(): IdentToken | undefined {
		const m = /^([\w-]+) */.exec(this.str);
		if (!m) return;
		this.skip(m);
		return { type: 'ident', string: m[1] };
	}

	/** Integer tokens, possibly with unit */
	private int(): NumberToken | undefined {
		const m = /^(([-+]?\d+)(\S+)?) */.exec(this.str);
		if (!m) return;
		this.skip(m);
		const n = parseInt(m[2], 10);
		const u = m[3] || '';
		return { type: 'number', string: m[1], unit: u, value: n };
	}

	/** Float tokens, possibly with unit */
	private float(): NumberToken | undefined {
		const m = /^(((?:[-+]?\d+)?\.\d+)(\S+)?) */.exec(this.str);
		if (!m) return;
		this.skip(m);
		const n = parseFloat(m[2]);
		const u = m[3] || '';
		return { type: 'number', string: m[1], unit: u, value: n };
	}

	/** Number tokens, either float or int */
	private number(): NumberToken | undefined {
		return this.float() || this.int();
	}

	/** Double-quoted strings */
	private double(): StringToken | undefined {
		const m = /^"([^"]*)" */.exec(this.str);
		if (!m) return;
		this.skip(m);
		return { type: 'string', quote: '"', string: `"${m[1]}"`, value: m[1] };