Merge pull request #494 from sveltejs/validate-bindings

validate bindings

src/validate/html/index.js

@@ -1,12 +1,12 @@
 import * as namespaces from '../../utils/namespaces.js';
-import flattenReference from '../../utils/flattenReference.js';
+import validateElement from './validateElement.js';
+import validateWindow from './validateWindow.js';
 
 const svg = /^(?:altGlyph|altGlyphDef|altGlyphItem|animate|animateColor|animateMotion|animateTransform|circle|clipPath|color-profile|cursor|defs|desc|discard|ellipse|feBlend|feColorMatrix|feComponentTransfer|feComposite|feConvolveMatrix|feDiffuseLighting|feDisplacementMap|feDistantLight|feDropShadow|feFlood|feFuncA|feFuncB|feFuncG|feFuncR|feGaussianBlur|feImage|feMerge|feMergeNode|feMorphology|feOffset|fePointLight|feSpecularLighting|feSpotLight|feTile|feTurbulence|filter|font|font-face|font-face-format|font-face-name|font-face-src|font-face-uri|foreignObject|g|glyph|glyphRef|hatch|hatchpath|hkern|image|line|linearGradient|marker|mask|mesh|meshgradient|meshpatch|meshrow|metadata|missing-glyph|mpath|path|pattern|polygon|polyline|radialGradient|rect|set|solidcolor|stop|switch|symbol|text|textPath|title|tref|tspan|unknown|use|view|vkern)$/;
 
-function list ( items, conjunction = 'or' ) {
-	if ( items.length === 1 ) return items[0];
-	return `${items.slice( 0, -1 ).join( ', ' )} ${conjunction} ${items[ items.length - 1 ]}`;
-}
+const meta = new Map([
+	[ ':Window', validateWindow ]
+]);
 
 export default function validateHtml ( validator, html ) {
 	let elementDepth = 0;
@@ -17,31 +17,13 @@ export default function validateHtml ( validator, html ) {
 				validator.warn( `<${node.name}> is an SVG element – did you forget to add { namespace: 'svg' } ?`, node.start );
 			}
 
-			elementDepth += 1;
-
-			node.attributes.forEach( attribute => {
-				if ( attribute.type === 'EventHandler' ) {
-					const { callee, start, type } = attribute.expression;
-
-					if ( type !== 'CallExpression' ) {
-						validator.error( `Expected a call expression`, start );
-					}
-
-					const { name } = flattenReference( callee );
-
-					if ( name === 'this' || name === 'event' ) return;
-					if ( callee.type === 'Identifier' && callee.name === 'set' || callee.name === 'fire' || callee.name in validator.methods ) return;
-
-					const validCallees = list( [ 'this.*', 'event.*', 'set', 'fire' ].concat( Object.keys( validator.methods ) ) );
-					let message = `'${validator.source.slice( callee.start, callee.end )}' is an invalid callee (should be one of ${validCallees})`;
+			if ( meta.has( node.name ) ) {
+				return meta.get( node.name )( validator, node );
+			}
 
-					if ( callee.type === 'Identifier' && callee.name in validator.helpers ) {
-						message += `. '${callee.name}' exists on 'helpers', did you put it in the wrong place?`;
-					}
+			elementDepth += 1;
 
-					validator.error( message, start );
-				}
-			});
+			validateElement( validator, node );
 		}
 
 		if ( node.children ) {

src/validate/html/validateElement.js

@@ -0,0 +1,85 @@
+import flattenReference from '../../utils/flattenReference.js';
+
+export default function validateElement ( validator, node ) {
+	const isComponent = node.name === ':Self' || validator.components.has( node.name );
+
+	node.attributes.forEach( attribute => {
+		if ( !isComponent && attribute.type === 'Binding' ) {
+			const { name } = attribute;
+
+			if ( name === 'value' ) {
+				if ( node.name !== 'input' && node.name !== 'textarea' && node.name !== 'select' ) {
+					validator.error( `'value' is not a valid binding on <${node.name}> elements`, attribute.start );
+				}
+			}
+
+			else if ( name === 'checked' ) {
+				if ( node.name !== 'input' ) {
+					validator.error( `'checked' is not a valid binding on <${node.name}> elements`, attribute.start );
+				}
+
+				if ( getType( validator, node ) !== 'checkbox' ) {
+					validator.error( `'checked' binding can only be used with <input type="checkbox">` );
+				}
+			}
+
+			else if ( name === 'group' ) {
+				if ( node.name !== 'input' ) {
+					validator.error( `'group' is not a valid binding on <${node.name}> elements`, attribute.start );
+				}
+
+				const type = getType( validator, node );
+
+				if ( type !== 'checkbox' && type !== 'radio' ) {
+					validator.error( `'checked' binding can only be used with <input type="checkbox"> or <input type="radio">` );
+				}
+			}
+
+			else {
+				validator.error( `'${attribute.name}' is not a valid binding`, attribute.start );
+			}
+		}
+
+		if ( attribute.type === 'EventHandler' ) {
+			const { callee, start, type } = attribute.expression;
+
+			if ( type !== 'CallExpression' ) {
+				validator.error( `Expected a call expression`, start );
+			}
+
+			const { name } = flattenReference( callee );
+
+			if ( name === 'this' || name === 'event' ) return;
+			if ( callee.type === 'Identifier' && callee.name === 'set' || callee.name === 'fire' || validator.methods.has( callee.name ) ) return;
+
+			const validCallees = list( [ 'this.*', 'event.*', 'set', 'fire' ].concat( Array.from( validator.methods.keys() ) ) );
+			let message = `'${validator.source.slice( callee.start, callee.end )}' is an invalid callee (should be one of ${validCallees})`;
+
+			if ( callee.type === 'Identifier' && validator.helpers.has( callee.name ) ) {
+				message += `. '${callee.name}' exists on 'helpers', did you put it in the wrong place?`;
+			}
+
+			validator.error( message, start );
+		}
+	});
+}
+
+function getType ( validator, node ) {
+	const attribute = node.attributes.find( attribute => attribute.name === 'type' );
+	if ( !attribute ) return null;
+
+	if ( attribute.value === true ) {
+		validator.error( `'type' attribute must be specified`, attribute.start );
+	}
+
+	if ( attribute.value.length > 1 || attribute.value[0].type !== 'Text' ) {
+		validator.error( `'type attribute cannot be dynamic`, attribute.start );
+	}
+
+	return attribute.value[0].data;
+}
+
+function list ( items, conjunction = 'or' ) {
+	if ( items.length === 1 ) return items[0];
+	return `${items.slice( 0, -1 ).join( ', ' )} ${conjunction} ${items[ items.length - 1 ]}`;
+}

src/validate/html/validateWindow.js

@@ -0,0 +1,3 @@
+export default function validateWindow () {
+	// TODO
+}

src/validate/index.js

@@ -41,8 +41,9 @@ export default function validate ( parsed, source, { onerror, onwarn, name, file
 		namespace: null,
 		defaultExport: null,
 		properties: {},
-		methods: {},
-		helpers: {}
+		components: new Map(),
+		methods: new Map(),
+		helpers: new Map()
 	};
 
 	try {

src/validate/js/index.js

@@ -73,10 +73,10 @@ export default function validateJs ( validator, js ) {
 		}
 	});
 
-	[ 'methods', 'helpers' ].forEach( key => {
+	[ 'components', 'methods', 'helpers' ].forEach( key => {
 		if ( validator.properties[ key ] ) {
 			validator.properties[ key ].value.properties.forEach( prop => {
-				validator[ key ][ prop.key.name ] = prop.value;
+				validator[ key ].set( prop.key.name, prop.value );
 			});
 		}
 	});

test/validator/samples/binding-invalid-on-element/errors.json

@@ -0,0 +1,8 @@
+[{
+	"message": "'value' is not a valid binding on <div> elements",
+	"pos": 5,
+	"loc": {
+		"line": 1,
+		"column": 5
+	}
+}]

test/validator/samples/binding-invalid-on-element/input.html

@@ -0,0 +1 @@
+<div bind:value></div>

test/validator/samples/binding-invalid/errors.json

@@ -0,0 +1,8 @@
+[{
+	"message": "'whatever' is not a valid binding",
+	"pos": 5,
+	"loc": {
+		"line": 1,
+		"column": 5
+	}
+}]

test/validator/samples/binding-invalid/input.html

@@ -0,0 +1 @@
+<div bind:whatever></div>