snakeskin/lib/directions/cycles.js

Компилятор блочных шаблонов c поддержкой наследования.

(() => {
	var varDeclRgxp = /\bvar\b/,
		splitDeclRgxp = /;/,
		forRgxp = /\s*(var|)\s+(.*?)\s+(in|of)\s+(.*)/;

	Snakeskin.addDirective(
		'for',

		{
			block: true,
			notEmpty: true,
			group: 'cycle'
		},

		function (command) {
			this.startDir();

			if (splitDeclRgxp.test(command)) {
				let parts = command.split(';');

				if (parts.length !== 3) {
					return this.error(`invalid "${this.name}" declaration`);
				}

				if (this.isReady()) {
					let decl = varDeclRgxp.test(parts[0]) ?
						this.multiDeclVar(parts[0].replace(varDeclRgxp, '')) : this.prepareOutput(parts[0], true);

					parts[1] = parts[1] && `(${parts[1]})`;
					parts[2] = parts[2] && `(${parts[2]})`;

					this.append(`for (${decl + this.prepareOutput(parts.slice(1).join(';'), true)}) {`);
				}

			} else {
				let parts = forRgxp.exec(command);

				if (!parts) {
					return this.error(`invalid "${this.name}" declaration`);
				}

				if (this.isReady()) {
					let decl = parts[1] ?
						this.multiDeclVar(parts[2], false, '') : this.prepareOutput(parts[2], true);

					this.append(`for (${decl} ${parts[3]} ${this.prepareOutput(parts[4], true)}) {`);
				}
			}
		},

		function () {
			this.append('}');
		}
	);

	Snakeskin.addDirective(
		'while',

		{
			block: true,
			notEmpty: true,
			group: 'cycle'
		},

		function (command) {
			if (this.structure.name == 'do') {
				this.structure.params.chain = true;

				if (this.isReady()) {
					this.append(`} while (${this.prepareOutput(command, true)});`);
				}

				Snakeskin.Directions['end'].call(this);

			} else {
				this.startDir();
				if (this.isReady()) {
					this.append(`while (${this.prepareOutput(command, true)}) {`);
				}
			}
		},

		function () {
			this.append('}');
		}
	);

	Snakeskin.addDirective(
		'do',

		{
			block: true,
			group: 'cycle',
			after: {
				'while': true,
				'end': true
			}
		},

		function () {
			this.startDir();
			this.append('do {');
		},

		function () {
			if (!this.structure.params.chain) {
				this.append('} while (true);');
			}
		}
	);

	Snakeskin.addDirective(
		'repeat',

		{
			block: true,
			group: 'cycle',
			after: {
				'until': true,
				'end': true
			}
		},

		function () {
			this.startDir();
			this.append('do {');
		},

		function () {
			if (!this.structure.params.chain) {
				this.append('} while (true);');
			}
		}
	);

	Snakeskin.addDirective(
		'until',

		{
			placement: 'template',
			notEmpty: true
		},

		function (command) {
			if (this.structure.name !== 'repeat') {
				return this.error(`directive "${this.name}" can be used only with a "repeat"`);
			}

			this.structure.params.chain = true;

			if (this.isReady()) {
				this.append(`} while (${this.prepareOutput(command, true)});`);
			}

			Snakeskin.Directions['end'].call(this);
		}
	);
})();