feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

1 files changed, 511 insertions, 0 deletions

diff --git a/vanilla/node_modules/css-tree/lib/lexer/Lexer.js b/vanilla/node_modules/css-tree/lib/lexer/Lexer.js
new file mode 100644
index 0000000..d09f574
--- /dev/null
+++ b/vanilla/node_modules/css-tree/lib/lexer/Lexer.js
@@ -0,0 +1,511 @@
+import { SyntaxReferenceError, SyntaxMatchError } from './error.js';
+import * as names from '../utils/names.js';
+import { cssWideKeywords } from './generic-const.js';
+import { createGenericTypes } from './generic.js';
+import * as units from './units.js';
+import { parse, generate, walk } from '../definition-syntax/index.js';
+import prepareTokens from './prepare-tokens.js';
+import { buildMatchGraph } from './match-graph.js';
+import { matchAsTree } from './match.js';
+import * as trace from './trace.js';
+import { matchFragments } from './search.js';
+import { getStructureFromConfig } from './structure.js';
+
+function dumpMapSyntax(map, compact, syntaxAsAst) {
+    const result = {};
+
+    for (const name in map) {
+        if (map[name].syntax) {
+            result[name] = syntaxAsAst
+                ? map[name].syntax
+                : generate(map[name].syntax, { compact });
+        }
+    }
+
+    return result;
+}
+
+function dumpAtruleMapSyntax(map, compact, syntaxAsAst) {
+    const result = {};
+
+    for (const [name, atrule] of Object.entries(map)) {
+        result[name] = {
+            prelude: atrule.prelude && (
+                syntaxAsAst
+                    ? atrule.prelude.syntax
+                    : generate(atrule.prelude.syntax, { compact })
+            ),
+            descriptors: atrule.descriptors && dumpMapSyntax(atrule.descriptors, compact, syntaxAsAst)
+        };
+    }
+
+    return result;
+}
+
+function valueHasVar(tokens) {
+    for (let i = 0; i < tokens.length; i++) {
+        if (tokens[i].value.toLowerCase() === 'var(') {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+function syntaxHasTopLevelCommaMultiplier(syntax) {
+    const singleTerm = syntax.terms[0];
+
+    return (
+        syntax.explicit === false &&
+        syntax.terms.length === 1 &&
+        singleTerm.type === 'Multiplier' &&
+        singleTerm.comma === true
+    );
+}
+
+function buildMatchResult(matched, error, iterations) {
+    return {
+        matched,
+        iterations,
+        error,
+        ...trace
+    };
+}
+
+function matchSyntax(lexer, syntax, value, useCssWideKeywords) {
+    const tokens = prepareTokens(value, lexer.syntax);
+    let result;
+
+    if (valueHasVar(tokens)) {
+        return buildMatchResult(null, new Error('Matching for a tree with var() is not supported'));
+    }
+
+    if (useCssWideKeywords) {
+        result = matchAsTree(tokens, lexer.cssWideKeywordsSyntax, lexer);
+    }
+
+    if (!useCssWideKeywords || !result.match) {
+        result = matchAsTree(tokens, syntax.match, lexer);
+        if (!result.match) {
+            return buildMatchResult(
+                null,
+                new SyntaxMatchError(result.reason, syntax.syntax, value, result),
+                result.iterations
+            );
+        }
+    }
+
+    return buildMatchResult(result.match, null, result.iterations);
+}
+
+export class Lexer {
+    constructor(config, syntax, structure) {
+        this.cssWideKeywords = cssWideKeywords;
+        this.syntax = syntax;
+        this.generic = false;
+        this.units = { ...units };
+        this.atrules = Object.create(null);
+        this.properties = Object.create(null);
+        this.types = Object.create(null);
+        this.structure = structure || getStructureFromConfig(config);
+
+        if (config) {
+            if (config.cssWideKeywords) {
+                this.cssWideKeywords = config.cssWideKeywords;
+            }
+
+            if (config.units) {
+                for (const group of Object.keys(units)) {
+                    if (Array.isArray(config.units[group])) {
+                        this.units[group] = config.units[group];
+                    }
+                }
+            }
+
+            if (config.types) {
+                for (const [name, type] of Object.entries(config.types)) {
+                    this.addType_(name, type);
+                }
+            }
+
+            if (config.generic) {
+                this.generic = true;
+                for (const [name, value] of Object.entries(createGenericTypes(this.units))) {
+                    this.addType_(name, value);
+                }
+            }
+
+            if (config.atrules) {
+                for (const [name, atrule] of Object.entries(config.atrules)) {
+                    this.addAtrule_(name, atrule);
+                }
+            }
+
+            if (config.properties) {
+                for (const [name, property] of Object.entries(config.properties)) {
+                    this.addProperty_(name, property);
+                }
+            }
+        }
+
+        this.cssWideKeywordsSyntax = buildMatchGraph(this.cssWideKeywords.join(' |  '));
+    }
+
+    checkStructure(ast) {
+        function collectWarning(node, message) {
+            warns.push({ node, message });
+        }
+
+        const structure = this.structure;
+        const warns = [];
+
+        this.syntax.walk(ast, function(node) {
+            if (structure.hasOwnProperty(node.type)) {
+                structure[node.type].check(node, collectWarning);
+            } else {
+                collectWarning(node, 'Unknown node type `' + node.type + '`');
+            }
+        });
+
+        return warns.length ? warns : false;
+    }
+
+    createDescriptor(syntax, type, name, parent = null) {
+        const ref = {
+            type,
+            name
+        };
+        const descriptor = {
+            type,
+            name,
+            parent,
+            serializable: typeof syntax === 'string' || (syntax && typeof syntax.type === 'string'),
+            syntax: null,
+            match: null,
+            matchRef: null // used for properties when a syntax referenced as <'property'> in other syntax definitions
+        };
+
+        if (typeof syntax === 'function') {
+            descriptor.match = buildMatchGraph(syntax, ref);
+        } else {
+            if (typeof syntax === 'string') {
+                // lazy parsing on first access
+                Object.defineProperty(descriptor, 'syntax', {
+                    get() {
+                        Object.defineProperty(descriptor, 'syntax', {
+                            value: parse(syntax)
+                        });
+
+                        return descriptor.syntax;
+                    }
+                });
+            } else {
+                descriptor.syntax = syntax;
+            }
+
+            // lazy graph build on first access
+            Object.defineProperty(descriptor, 'match', {
+                get() {
+                    Object.defineProperty(descriptor, 'match', {
+                        value: buildMatchGraph(descriptor.syntax, ref)
+                    });
+
+                    return descriptor.match;
+                }
+            });
+
+            if (type === 'Property') {
+                Object.defineProperty(descriptor, 'matchRef', {
+                    get() {
+                        const syntax = descriptor.syntax;
+                        const value = syntaxHasTopLevelCommaMultiplier(syntax)
+                            ? buildMatchGraph({
+                                ...syntax,
+                                terms: [syntax.terms[0].term]
+                            }, ref)
+                            : null;
+
+                        Object.defineProperty(descriptor, 'matchRef', {
+                            value
+                        });
+
+                        return value;
+                    }
+                });
+            }
+        }
+
+        return descriptor;
+    }
+    addAtrule_(name, syntax) {
+        if (!syntax) {
+            return;
+        }
+
+        this.atrules[name] = {
+            type: 'Atrule',
+            name: name,
+            prelude: syntax.prelude ? this.createDescriptor(syntax.prelude, 'AtrulePrelude', name) : null,
+            descriptors: syntax.descriptors
+                ? Object.keys(syntax.descriptors).reduce(
+                    (map, descName) => {
+                        map[descName] = this.createDescriptor(syntax.descriptors[descName], 'AtruleDescriptor', descName, name);
+                        return map;
+                    },
+                    Object.create(null)
+                )
+                : null
+        };
+    }
+    addProperty_(name, syntax) {
+        if (!syntax) {
+            return;
+        }
+
+        this.properties[name] = this.createDescriptor(syntax, 'Property', name);
+    }
+    addType_(name, syntax) {
+        if (!syntax) {
+            return;
+        }
+
+        this.types[name] = this.createDescriptor(syntax, 'Type', name);
+    }
+
+    checkAtruleName(atruleName) {
+        if (!this.getAtrule(atruleName)) {
+            return new SyntaxReferenceError('Unknown at-rule', '@' + atruleName);
+        }
+    }
+    checkAtrulePrelude(atruleName, prelude) {
+        const error = this.checkAtruleName(atruleName);
+
+        if (error) {
+            return error;
+        }
+
+        const atrule = this.getAtrule(atruleName);
+
+        if (!atrule.prelude && prelude) {
+            return new SyntaxError('At-rule `@' + atruleName + '` should not contain a prelude');
+        }
+
+        if (atrule.prelude && !prelude) {
+            if (!matchSyntax(this, atrule.prelude, '', false).matched) {
+                return new SyntaxError('At-rule `@' + atruleName + '` should contain a prelude');
+            }
+        }
+    }
+    checkAtruleDescriptorName(atruleName, descriptorName) {
+        const error = this.checkAtruleName(atruleName);
+
+        if (error) {
+            return error;
+        }
+
+        const atrule = this.getAtrule(atruleName);
+        const descriptor = names.keyword(descriptorName);
+
+        if (!atrule.descriptors) {
+            return new SyntaxError('At-rule `@' + atruleName + '` has no known descriptors');
+        }
+
+        if (!atrule.descriptors[descriptor.name] &&
+            !atrule.descriptors[descriptor.basename]) {
+            return new SyntaxReferenceError('Unknown at-rule descriptor', descriptorName);
+        }
+    }
+    checkPropertyName(propertyName) {
+        if (!this.getProperty(propertyName)) {
+            return new SyntaxReferenceError('Unknown property', propertyName);
+        }
+    }
+
+    matchAtrulePrelude(atruleName, prelude) {
+        const error = this.checkAtrulePrelude(atruleName, prelude);
+
+        if (error) {
+            return buildMatchResult(null, error);
+        }
+
+        const atrule = this.getAtrule(atruleName);
+
+        if (!atrule.prelude) {
+            return buildMatchResult(null, null);
+        }
+
+        return matchSyntax(this, atrule.prelude, prelude || '', false);
+    }
+    matchAtruleDescriptor(atruleName, descriptorName, value) {
+        const error = this.checkAtruleDescriptorName(atruleName, descriptorName);
+
+        if (error) {
+            return buildMatchResult(null, error);
+        }
+
+        const atrule = this.getAtrule(atruleName);
+        const descriptor = names.keyword(descriptorName);
+
+        return matchSyntax(this, atrule.descriptors[descriptor.name] || atrule.descriptors[descriptor.basename], value, false);
+    }
+    matchDeclaration(node) {
+        if (node.type !== 'Declaration') {
+            return buildMatchResult(null, new Error('Not a Declaration node'));
+        }
+
+        return this.matchProperty(node.property, node.value);
+    }
+    matchProperty(propertyName, value) {
+        // don't match syntax for a custom property at the moment
+        if (names.property(propertyName).custom) {
+            return buildMatchResult(null, new Error('Lexer matching doesn\'t applicable for custom properties'));
+        }
+
+        const error = this.checkPropertyName(propertyName);
+
+        if (error) {
+            return buildMatchResult(null, error);
+        }
+
+        return matchSyntax(this, this.getProperty(propertyName), value, true);
+    }
+    matchType(typeName, value) {
+        const typeSyntax = this.getType(typeName);
+
+        if (!typeSyntax) {
+            return buildMatchResult(null, new SyntaxReferenceError('Unknown type', typeName));
+        }
+
+        return matchSyntax(this, typeSyntax, value, false);
+    }
+    match(syntax, value) {
+        if (typeof syntax !== 'string' && (!syntax || !syntax.type)) {
+            return buildMatchResult(null, new SyntaxReferenceError('Bad syntax'));
+        }
+
+        if (typeof syntax === 'string' || !syntax.match) {
+            syntax = this.createDescriptor(syntax, 'Type', 'anonymous');
+        }
+
+        return matchSyntax(this, syntax, value, false);
+    }
+
+    findValueFragments(propertyName, value, type, name) {
+        return matchFragments(this, value, this.matchProperty(propertyName, value), type, name);
+    }
+    findDeclarationValueFragments(declaration, type, name) {
+        return matchFragments(this, declaration.value, this.matchDeclaration(declaration), type, name);
+    }
+    findAllFragments(ast, type, name) {
+        const result = [];
+
+        this.syntax.walk(ast, {
+            visit: 'Declaration',
+            enter: (declaration) => {
+                result.push.apply(result, this.findDeclarationValueFragments(declaration, type, name));
+            }
+        });
+
+        return result;
+    }
+
+    getAtrule(atruleName, fallbackBasename = true) {
+        const atrule = names.keyword(atruleName);
+        const atruleEntry = atrule.vendor && fallbackBasename
+            ? this.atrules[atrule.name] || this.atrules[atrule.basename]
+            : this.atrules[atrule.name];
+
+        return atruleEntry || null;
+    }
+    getAtrulePrelude(atruleName, fallbackBasename = true) {
+        const atrule = this.getAtrule(atruleName, fallbackBasename);
+
+        return atrule && atrule.prelude || null;
+    }
+    getAtruleDescriptor(atruleName, name) {
+        return this.atrules.hasOwnProperty(atruleName) && this.atrules.declarators
+            ? this.atrules[atruleName].declarators[name] || null
+            : null;
+    }
+    getProperty(propertyName, fallbackBasename = true) {
+        const property = names.property(propertyName);
+        const propertyEntry = property.vendor && fallbackBasename
+            ? this.properties[property.name] || this.properties[property.basename]
+            : this.properties[property.name];
+
+        return propertyEntry || null;
+    }
+    getType(name) {
+        return hasOwnProperty.call(this.types, name) ? this.types[name] : null;
+    }
+
+    validate() {
+        function syntaxRef(name, isType) {
+            return isType ? `<${name}>` : `<'${name}'>`;
+        }
+
+        function validate(syntax, name, broken, descriptor) {
+            if (broken.has(name)) {
+                return broken.get(name);
+            }
+
+            broken.set(name, false);
+            if (descriptor.syntax !== null) {
+                walk(descriptor.syntax, function(node) {
+                    if (node.type !== 'Type' && node.type !== 'Property') {
+                        return;
+                    }
+
+                    const map = node.type === 'Type' ? syntax.types : syntax.properties;
+                    const brokenMap = node.type === 'Type' ? brokenTypes : brokenProperties;
+
+                    if (!hasOwnProperty.call(map, node.name)) {
+                        errors.push(`${syntaxRef(name, broken === brokenTypes)} used missed syntax definition ${syntaxRef(node.name, node.type === 'Type')}`);
+                        broken.set(name, true);
+                    } else if (validate(syntax, node.name, brokenMap, map[node.name])) {
+                        errors.push(`${syntaxRef(name, broken === brokenTypes)} used broken syntax definition ${syntaxRef(node.name, node.type === 'Type')}`);
+                        broken.set(name, true);
+                    }
+                }, this);
+            }
+        }
+
+        const errors = [];
+        let brokenTypes = new Map();
+        let brokenProperties = new Map();
+
+        for (const key in this.types) {
+            validate(this, key, brokenTypes, this.types[key]);
+        }
+
+        for (const key in this.properties) {
+            validate(this, key, brokenProperties, this.properties[key]);
+        }
+
+        const brokenTypesArray = [...brokenTypes.keys()].filter(name => brokenTypes.get(name));
+        const brokenPropertiesArray = [...brokenProperties.keys()].filter(name => brokenProperties.get(name));
+
+        if (brokenTypesArray.length || brokenPropertiesArray.length) {
+            return {
+                errors,
+                types: brokenTypesArray,
+                properties: brokenPropertiesArray
+            };
+        }
+
+        return null;
+    }
+    dump(syntaxAsAst, pretty) {
+        return {
+            generic: this.generic,
+            cssWideKeywords: this.cssWideKeywords,
+            units: this.units,
+            types: dumpMapSyntax(this.types, !pretty, syntaxAsAst),
+            properties: dumpMapSyntax(this.properties, !pretty, syntaxAsAst),
+            atrules: dumpAtruleMapSyntax(this.atrules, !pretty, syntaxAsAst)
+        };
+    }
+    toString() {
+        return JSON.stringify(this.dump());
+    }
+};