add codes to warnings

src/css/Selector.ts

@@ -102,7 +102,10 @@ export default class Selector {
 			while (i-- > 1) {
 				const selector = block.selectors[i];
 				if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
-					validator.error(`:global(...) must be the first element in a compound selector`, selector);
+					validator.error(selector, {
+						code: `css-invalid-global`,
+						message: `:global(...) must be the first element in a compound selector`
+					});
 				}
 			}
 		});
@@ -120,7 +123,10 @@ export default class Selector {
 
 		for (let i = start; i < end; i += 1) {
 			if (this.blocks[i].global) {
-				validator.error(`:global(...) can be at the start or end of a selector sequence, but not in the middle`, this.blocks[i].selectors[0]);
+				validator.error(this.blocks[i].selectors[0], {
+					code: `css-invalid-global`,
+					message: `:global(...) can be at the start or end of a selector sequence, but not in the middle`
+				});
 			}
 		}
 	}

src/css/Stylesheet.ts

@@ -435,6 +435,7 @@ export default class Stylesheet {
 			const message = `Unused CSS selector`;
 
 			onwarn({
+				code: `css-unused-selector`,
 				message,
 				frame,
 				loc: { line: line + 1, column },

src/generators/wrapModule.ts

@@ -276,6 +276,7 @@ function getGlobals(dependencies: Dependency[], options: CompileOptions) {
 				onerror(error);
 			} else {
 				const warning = {
+					code: `options-missing-globals`,
 					message: `No name was supplied for imported module '${d.source}'. Guessing '${d.name}', but you should use options.globals`,
 				};
 

src/interfaces.ts

@@ -31,6 +31,7 @@ export interface Warning {
 	loc?: { line: number; column: number; pos?: number };
 	end?: { line: number; column: number; };
 	pos?: number;
+	code: string;
 	message: string;
 	filename?: string;
 	frame?: string;

src/parse/index.ts

@@ -71,11 +71,19 @@ export class Parser {
 			const current = this.current();
 
 			const type = current.type === 'Element' ? `<${current.name}>` : 'Block';
-			this.error(`${type} was left open`, current.start);
+			const slug = current.type === 'Element' ? 'element' : 'block';
+
+			this.error({
+				code: `unclosed-${slug}`,
+				message: `${type} was left open`
+			}, current.start);
 		}
 
 		if (state !== fragment) {
-			this.error('Unexpected end of input');
+			this.error({
+				code: `unexpected-eof`,
+				message: 'Unexpected end of input'
+			});
 		}
 
 		if (this.html.children.length) {
@@ -97,12 +105,16 @@ export class Parser {
 	}
 
 	acornError(err: any) {
-		this.error(err.message.replace(/ \(\d+:\d+\)$/, ''), err.pos);
+		this.error({
+			code: `parse-error`,
+			message: err.message.replace(/ \(\d+:\d+\)$/, '')
+		}, err.pos);
 	}
 
-	error(message: string, index = this.index) {
+	error({ code, message }: { code: string, message: string }, index = this.index) {
 		error(message, {
 			name: 'ParseError',
+			code,
 			source: this.template,
 			start: index,
 			filename: this.filename
@@ -116,7 +128,10 @@ export class Parser {
 		}
 
 		if (required) {
-			this.error(message || `Expected ${str}`);
+			this.error({
+				code: `unexpected-${this.index === this.template.length ? 'eof' : 'token'}`,
+				message: message || `Expected ${str}`
+			});
 		}
 
 		return false;
@@ -164,15 +179,21 @@ export class Parser {
 		const identifier = this.template.slice(this.index, this.index = i);
 
 		if (reservedNames.has(identifier)) {
-			this.error(`'${identifier}' is a reserved word in JavaScript and cannot be used here`, start);
+			this.error({
+				code: `unexpected-reserved-word`,
+				message: `'${identifier}' is a reserved word in JavaScript and cannot be used here`
+			}, start);
 		}
 
 		return identifier;
 	}
 
 	readUntil(pattern: RegExp) {
 		if (this.index >= this.template.length)
-			this.error('Unexpected end of input');
+			this.error({
+				code: `unexpected-eof`,
+				message: 'Unexpected end of input'
+			});
 
 		const start = this.index;
 		const match = pattern.exec(this.template.slice(start));
@@ -192,7 +213,10 @@ export class Parser {
 
 	requireWhitespace() {
 		if (!whitespace.test(this.template[this.index])) {
-			this.error(`Expected whitespace`);
+			this.error({
+				code: `missing-whitespace`,
+				message: `Expected whitespace`
+			});
 		}
 
 		this.allowWhitespace();

src/parse/read/directives.ts

@@ -2,7 +2,19 @@ import { parseExpressionAt } from 'acorn';
 import repeat from '../../utils/repeat';
 import { Parser } from '../index';
 
-const DIRECTIVES = {
+const DIRECTIVES: Record<string, {
+	names: string[];
+	attribute: (
+		start: number,
+		end: number,
+		type: string,
+		name: string,
+		expression?: any,
+		directiveName?: string
+	) => { start: number, end: number, type: string, name: string, value?: any, expression?: any };
+	allowedExpressionTypes: string[];
+	error: string;
+}> = {
 	Ref: {
 		names: ['ref'],
 		attribute(start, end, type, name) {
@@ -143,7 +155,10 @@ export function readDirective(
 		try {
 			expression = readExpression(parser, expressionStart, quoteMark);
 			if (directive.allowedExpressionTypes.indexOf(expression.type) === -1) {
-				parser.error(directive.error, expressionStart);
+				parser.error({
+					code: `invalid-directive-value`,
+					message: directive.error
+				}, expressionStart);
 			}
 		} catch (err) {
 			if (parser.template[expressionStart] === '{') {
@@ -155,7 +170,10 @@ export function readDirective(
 					const value = parser.template.slice(expressionStart + (parser.v2 ? 1 : 2), expressionEnd);
 					message += ` — use '${value}', not '${parser.v2 ? `{${value}}` : `{{${value}}}`}'`;
 				}
-				parser.error(message, expressionStart);
+				parser.error({
+					code: `invalid-directive-value`,
+					message
+				}, expressionStart);
 			}
 
 			throw err;

src/parse/read/script.ts

@@ -12,7 +12,10 @@ export default function readScript(parser: Parser, start: number, attributes: No
 	const scriptStart = parser.index;
 	const scriptEnd = parser.template.indexOf(scriptClosingTag, scriptStart);
 
-	if (scriptEnd === -1) parser.error(`<script> must have a closing tag`);
+	if (scriptEnd === -1) parser.error({
+		code: `unclosed-script`,
+		message: `<script> must have a closing tag`
+	});
 
 	const source =
 		repeat(' ', scriptStart) + parser.template.slice(scriptStart, scriptEnd);

src/parse/read/style.ts

@@ -17,7 +17,10 @@ export default function readStyle(parser: Parser, start: number, attributes: Nod
 		});
 	} catch (err) {
 		if (err.name === 'CssSyntaxError') {
-			parser.error(err.message, err.offset);
+			parser.error({
+				code: `css-syntax-error`,
+				message: err.message
+			}, err.offset);
 		} else {
 			throw err;
 		}

src/parse/state/mustache.ts

@@ -56,7 +56,10 @@ export default function mustache(parser: Parser) {
 		} else if (block.type === 'AwaitBlock') {
 			expected = 'await';
 		} else {
-			parser.error(`Unexpected block closing tag`);
+			parser.error({
+				code: `unexpected-block-close`,
+				message: `Unexpected block closing tag`
+			});
 		}
 
 		parser.eat(expected, true);
@@ -86,9 +89,10 @@ export default function mustache(parser: Parser) {
 	} else if (parser.eat(parser.v2 ? ':elseif' : 'elseif')) {
 		const block = parser.current();
 		if (block.type !== 'IfBlock')
-			parser.error(
-				'Cannot have an {{elseif ...}} block outside an {{#if ...}} block'
-			);
+			parser.error({
+				code: `invalid-elseif-placement`,
+				message: 'Cannot have an {{elseif ...}} block outside an {{#if ...}} block'
+			});
 
 		parser.requireWhitespace();
 
@@ -117,9 +121,10 @@ export default function mustache(parser: Parser) {
 	} else if (parser.eat(parser.v2 ? ':else' : 'else')) {
 		const block = parser.current();
 		if (block.type !== 'IfBlock' && block.type !== 'EachBlock') {
-			parser.error(
-				'Cannot have an {{else}} block outside an {{#if ...}} or {{#each ...}} block'
-			);
+			parser.error({
+				code: `invalid-else-placement`,
+				message: 'Cannot have an {{else}} block outside an {{#if ...}} or {{#each ...}} block'
+			});
 		}
 
 		parser.allowWhitespace();
@@ -191,7 +196,10 @@ export default function mustache(parser: Parser) {
 		} else if (parser.eat('await')) {
 			type = 'AwaitBlock';
 		} else {
-			parser.error(`Expected if, each or await`);
+			parser.error({
+				code: `expected-block-type`,
+				message: `Expected if, each or await`
+			});
 		}
 
 		parser.requireWhitespace();
@@ -249,28 +257,42 @@ export default function mustache(parser: Parser) {
 					parser.allowWhitespace();
 
 					const destructuredContext = parser.readIdentifier();
-					if (!destructuredContext) parser.error(`Expected name`);
+					if (!destructuredContext) parser.error({
+						code: `expected-name`,
+						message: `Expected name`
+					});
 
 					block.destructuredContexts.push(destructuredContext);
 					parser.allowWhitespace();
 				} while (parser.eat(','));
 
-				if (!block.destructuredContexts.length) parser.error(`Expected name`);
+				if (!block.destructuredContexts.length) parser.error({
+					code: `expected-name`,
+					message: `Expected name`
+				});
+
 				block.context = block.destructuredContexts.join('_');
 
 				parser.allowWhitespace();
 				parser.eat(']', true);
 			} else {
 				block.context = parser.readIdentifier();
-				if (!block.context) parser.error(`Expected name`);
+				if (!block.context) parser.error({
+					code: `expected-name`,
+					message: `Expected name`
+				});
 			}
 
 			parser.allowWhitespace();
 
 			if (parser.eat(',')) {
 				parser.allowWhitespace();
 				block.index = parser.readIdentifier();
-				if (!block.index) parser.error(`Expected name`);
+				if (!block.index) parser.error({
+					code: `expected-name`,
+					message: `Expected name`
+				});
+
 				parser.allowWhitespace();
 			}
 
@@ -287,7 +309,10 @@ export default function mustache(parser: Parser) {
 					expression.property.computed ||
 					expression.property.type !== 'Identifier'
 				) {
-					parser.error('invalid key', expression.start);
+					parser.error({
+						code: `invalid-key`,
+						message: 'invalid key'
+					}, expression.start);
 				}
 
 				block.key = expression.property.name;
@@ -296,7 +321,10 @@ export default function mustache(parser: Parser) {
 				parser.allowWhitespace();
 			} else if (parser.eat('@')) {
 				block.key = parser.readIdentifier();
-				if (!block.key) parser.error(`Expected name`);
+				if (!block.key) parser.error({
+					code: `expected-name`,
+					message: `Expected name`
+				});
 				parser.allowWhitespace();
 			}
 		}