syndicate-lang
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preserves
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Repair checker

This commit is contained in:
Tony Garnock-Jones 2021-05-21 17:28:18 +02:00
parent 2bde06f509
commit dbd6c3cf53
1 changed files with 51 additions and 29 deletions
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80
implementations/javascript/packages/schema/src/checker.ts
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@ -1,5 +1,5 @@
import { typeFor } from './gentype';
import { ANY_TYPE } from './type';
import { typeFor, typeForIntersection } from './gentype';
import { ANY_TYPE, FieldType, SimpleType } from './type';
import * as M from './meta';
export function checkSchema(schema: M.Schema): M.Schema {
@ -32,36 +32,41 @@ class Checker {
switch (def._variant) {
case 'or':
[def.pattern0, def.pattern1, ... def.patternN].forEach(({ variantLabel, pattern }) =>
this.checkPattern(new Set(), pattern, `variant ${variantLabel} of ${name.description!}`));
this.checkPattern(new Set(),
pattern,
`variant ${variantLabel} of ${name.description!}`,
typeFor(_ref => ANY_TYPE, pattern)));
break;
case 'and': {
const ps = [def.pattern0, def.pattern1, ... def.patternN];
const scope = new Set<string>();
[def.pattern0, def.pattern1, ... def.patternN].forEach((p) =>
this.checkNamedPattern(scope, p, name.description!));
ps.forEach((p) => this.checkNamedPattern(
scope, p, name.description!, typeForIntersection(_ref => ANY_TYPE, ps)));
break;
}
case 'Pattern':
this.checkPattern(new Set(), def.value, name.description!);
this.checkPattern(
new Set(), def.value, name.description!, typeFor(_ref => ANY_TYPE, def.value));
break;
}
}
checkNamedPattern(scope: Set<string>, p: M.NamedPattern, context: string): void {
checkNamedPattern(scope: Set<string>, p: M.NamedPattern, context: string, t: SimpleType): void {
switch (p._variant) {
case 'named':
this.checkBinding(scope, p.value.name, context);
this.checkPattern(scope,
M.Pattern.SimplePattern(p.value.pattern),
`${p.value.name.description!} of ${context}`);
`${p.value.name.description!} of ${context}`,
stepType(t, p.value.name.description!));
break;
case 'anonymous':
this.checkPattern(scope, p.value, context);
this.checkPattern(scope, p.value, context, t);
break;
}
}
checkPattern(scope: Set<string>, p: M.Pattern, context: string): void {
const t = typeFor((_ref) => ANY_TYPE, p);
checkPattern(scope: Set<string>, p: M.Pattern, context: string, t: SimpleType): void {
switch (p._variant) {
case 'SimplePattern':
if (p.value._variant !== 'lit' && (t.kind === 'record' || t.kind === 'unit')) {
@ -72,58 +77,75 @@ class Checker {
((p: M.CompoundPattern): void => {
switch (p._variant) {
case 'rec':
this.checkNamedPattern(scope, p.label, `label of ${context}`);
this.checkNamedPattern(scope, p.fields, `fields of ${context}`);
this.checkNamedPattern(scope, p.label, `label of ${context}`, t);
this.checkNamedPattern(scope, p.fields, `fields of ${context}`, t);
break;
case 'tuple':
p.patterns.forEach((pp, i) =>
this.checkNamedPattern(scope, pp, `item ${i} of ${context}`));
this.checkNamedPattern(scope, pp, `item ${i} of ${context}`, t));
break;
case 'tuple*':
if (p.variable._variant === 'named') {
this.checkBinding(scope, p.variable.value.name, context);
this.checkPattern(scope,
M.Pattern.SimplePattern(p.variable.value.pattern),
`${JSON.stringify(p.variable.value.name.description!)} of ${context}`);
`${JSON.stringify(p.variable.value.name.description!)} of ${context}`,
stepType(t, p.variable.value.name.description!));
} else {
if (t.kind !== 'array') {
this.recordProblem(context, 'unable to reconstruct tail of tuple* pattern');
} else {
this.checkPattern(scope,
M.Pattern.SimplePattern(p.variable.value),
`variable-length portion of ${context}`,
t.type);
}
this.checkPattern(scope,
M.Pattern.SimplePattern(p.variable.value),
`variable-length portion of ${context}`);
}
p.fixed.forEach((pp, i) =>
this.checkNamedPattern(scope, pp, `item ${i} of ${context}`));
this.checkNamedPattern(scope, pp, `item ${i} of ${context}`, t));
break;
case 'setof':
if (t.kind !== 'set') {
this.recordProblem(context, 'unable to reconstruct set');
} else {
this.checkPattern(scope,
M.Pattern.SimplePattern(p.pattern),
`set in ${context}`,
t.type);
}
this.checkPattern(scope,
M.Pattern.SimplePattern(p.pattern),
`set in ${context}`);
break;
case 'dictof':
if (t.kind !== 'dictionary') {
this.recordProblem(context, 'unable to reconstruct dictionary');
} else {
this.checkPattern(scope,
M.Pattern.SimplePattern(p.key),
`key in dictionary in ${context}`,
t.key);
this.checkPattern(scope,
M.Pattern.SimplePattern(p.value),
`value in dictionary in ${context}`,
t.value);
}
this.checkPattern(scope,
M.Pattern.SimplePattern(p.key),
`key in dictionary in ${context}`);
this.checkPattern(scope,
M.Pattern.SimplePattern(p.value),
`value in dictionary in ${context}`);
break;
case 'dict':
p.entries.forEach((np, key) =>
this.checkNamedPattern(
scope,
M.promoteNamedSimplePattern(M.addNameIfAbsent(np, key)),
`entry ${key.asPreservesText()} in dictionary in ${context}`));
`entry ${key.asPreservesText()} in dictionary in ${context}`,
t));
break;
}
})(p.value);
}
}
}
function stepType(t: SimpleType, key: string): FieldType {
if (t.kind !== 'record' || !t.fields.has(key)) {
throw new Error(
`Internal error: cannot step ${JSON.stringify(t)} by ${JSON.stringify(key)}`);
}
return t.fields.get(key)!;
}