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52 lines
2.4 KiB
JavaScript
52 lines
2.4 KiB
JavaScript
const { SourceType, SourceTypeIdent } = require('../source-type');
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const ParseProblem = require('../parsetypes/parse-problem');
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/**
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* @param {SourceType} source_type
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* @param {*} probs
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*/
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function checkExtends(source_type, probs) {
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if (source_type.extends_types.length === 0) {
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return;
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}
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const supertypes = source_type.extends_types.map(st => st.resolved);
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const supertype = supertypes[0];
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if (source_type.typeKind === 'enum') {
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probs.push(ParseProblem.Error(source_type.extends_types[0].tokens, `Enum types cannot declare a superclass`));
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}
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if (source_type.typeKind === 'class' && supertypes.length > 1) {
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probs.push(ParseProblem.Error(source_type.extends_types[1].tokens, `Class types cannot inherit from more than one type`));
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}
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if (source_type.typeKind === 'class' && supertype.typeKind !== 'class') {
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probs.push(ParseProblem.Error(source_type.extends_types[0].tokens, `Class '${source_type.fullyDottedRawName}' cannot inherit from ${supertype.typeKind} type: '${supertype.fullyDottedRawName}'`));
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}
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if (source_type.typeKind === 'class' && supertype.typeKind === 'class' && supertype.modifiers.includes('final')) {
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probs.push(ParseProblem.Error(source_type.extends_types[0].tokens, `Class '${source_type.fullyDottedRawName}' cannot inherit from final class: '${supertype.fullyDottedRawName}'`));
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}
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if (source_type.typeKind === 'class' && supertype === source_type) {
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probs.push(ParseProblem.Error(source_type.extends_types[0].tokens, `Class '${source_type.fullyDottedRawName}' cannot inherit from itself`));
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}
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if (source_type.typeKind === 'interface') {
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supertypes.forEach((supertype, i) => {
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if (supertype.typeKind !== 'interface') {
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probs.push(ParseProblem.Error(source_type.extends_types[i].tokens, `Interface '${source_type.fullyDottedRawName}' cannot inherit from ${supertype.typeKind} type: '${supertype.fullyDottedRawName}'`));
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}
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if (supertype === source_type) {
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probs.push(ParseProblem.Error(source_type.extends_types[i].tokens, `Interface '${source_type.fullyDottedRawName}' cannot inherit from itself`));
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}
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})
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}
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}
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/**
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* @param {SourceType[]} source_types
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*/
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module.exports = function(source_types) {
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/** @type {ParseProblem[]} */
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const probs = [];
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source_types.forEach(type => checkExtends(type, probs));
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return probs;
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}
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