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Original file line number | Diff line number | Diff line change |
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@@ -1,77 +1,278 @@ | ||
import { AstNode } from '../ast' | ||
import { Context } from '../scope' | ||
import { AstNode, AstNodeKind } from '../ast' | ||
import { Name } from '../ast/operand' | ||
import { Context, Definition, DefinitionMap, defKey } from '../scope' | ||
|
||
/** | ||
* Resolve every name to its definition | ||
*/ | ||
export const resolveName = (node: AstNode, ctx: Context): void => { | ||
const m = ctx.moduleStack.at(-1)! | ||
m.astStack.push(node) | ||
switch (node.kind) { | ||
case 'module': { | ||
for (const statement of node.block.statements) { | ||
resolveName(statement, ctx) | ||
} | ||
break | ||
} | ||
case 'use-expr': | ||
case 'variant': | ||
case 'return-stmt': | ||
case 'break-stmt': | ||
case 'arg': | ||
case 'block': | ||
case 'param': | ||
case 'type-bounds': | ||
case 'fn-type': | ||
case 'generic': | ||
case 'if-expr': | ||
case 'match-clause': | ||
case 'pattern': | ||
case 'con-pattern': | ||
case 'list-pattern': | ||
case 'field-pattern': | ||
case 'hole': | ||
case 'identifier': | ||
case 'name': | ||
case 'string-interpolated': | ||
case 'operand-expr': | ||
case 'unary-expr': | ||
case 'binary-expr': | ||
case 'closure-expr': | ||
case 'list-expr': | ||
case 'if-let-expr': | ||
case 'while-expr': | ||
case 'for-expr': | ||
case 'match-expr': | ||
case 'var-def': | ||
case 'fn-def': | ||
case 'trait-def': | ||
case 'impl-def': | ||
case 'type-def': | ||
case 'field-def': | ||
case 'string-literal': | ||
case 'char-literal': | ||
case 'int-literal': | ||
case 'float-literal': | ||
case 'bool-literal': | ||
case 'add-op': | ||
case 'sub-op': | ||
case 'mult-op': | ||
case 'div-op': | ||
case 'exp-op': | ||
case 'mod-op': | ||
case 'eq-op': | ||
case 'ne-op': | ||
case 'ge-op': | ||
case 'le-op': | ||
case 'gt-op': | ||
case 'lt-op': | ||
case 'and-op': | ||
case 'or-op': | ||
case 'assign-op': | ||
case 'method-call-op': | ||
case 'field-access-op': | ||
case 'call-op': | ||
case 'unwrap-op': | ||
case 'bind-op': | ||
case 'await-op': | ||
case 'variant': { | ||
node.fieldDefs.forEach(fd => resolveName(fd, ctx)) | ||
break | ||
} | ||
case 'arg': { | ||
resolveName(node.expr, ctx) | ||
break | ||
} | ||
case 'block': { | ||
withScope(ctx, () => node.statements.forEach(s => resolveName(s, ctx))) | ||
break | ||
} | ||
case 'param': { | ||
resolveName(node.pattern, ctx) | ||
if (node.paramType) { | ||
resolveName(node.paramType, ctx) | ||
} | ||
break | ||
} | ||
case 'type-bounds': { | ||
node.bounds.forEach(b => resolveName(b, ctx)) | ||
break | ||
} | ||
case 'fn-type': { | ||
resolveName(node.returnType, ctx) | ||
node.paramTypes.forEach(pt => resolveName(pt, ctx)) | ||
node.generics.forEach(g => resolveName(g, ctx)) | ||
break | ||
} | ||
case 'generic': { | ||
node.bounds.forEach(b => resolveName(b, ctx)) | ||
break | ||
} | ||
case 'if-expr': { | ||
resolveName(node.condition, ctx) | ||
resolveName(node.thenBlock, ctx) | ||
if (node.elseBlock) { | ||
resolveName(node.elseBlock, ctx) | ||
} | ||
break | ||
} | ||
case 'match-clause': { | ||
withScope(ctx, () => { | ||
node.patterns.forEach(p => resolveName(p, ctx)) | ||
if (node.guard) { | ||
resolveName(node.guard, ctx) | ||
} | ||
resolveName(node.block, ctx) | ||
}) | ||
break | ||
} | ||
case 'pattern': { | ||
resolveName(node.expr, ctx) | ||
if (node.name) { | ||
resolveName(node.name, ctx) | ||
} | ||
break | ||
} | ||
case 'con-pattern': { | ||
resolveName(node.identifier, ctx) | ||
node.fieldPatterns.forEach(fp => resolveName(fp, ctx)) | ||
break | ||
} | ||
case 'list-pattern': { | ||
node.itemPatterns.forEach(ip => resolveName(ip, ctx)) | ||
break | ||
} | ||
case 'field-pattern': { | ||
if (node.pattern) { | ||
resolveName(node.pattern, ctx) | ||
} | ||
if (node.name) { | ||
resolveName(node.name, ctx) | ||
} | ||
break | ||
} | ||
case 'identifier': { | ||
node.typeArgs.forEach(ta => resolveName(ta, ctx)) | ||
const def = findName(node.names[0], ctx) | ||
if (!def) { | ||
// TODO: report error | ||
break | ||
} | ||
// TODO: check other names | ||
break | ||
} | ||
case 'name': { | ||
if (findParent(ctx, ['pattern'])) { | ||
addDef(node.value, node, ctx) | ||
} else { | ||
const def = findName(node, ctx) | ||
if (!def) { | ||
// TODO: report error | ||
break | ||
} | ||
node.def = def | ||
} | ||
break | ||
} | ||
case 'string-interpolated': { | ||
node.tokens.map(t => { | ||
if (typeof t !== 'string') { | ||
resolveName(t, ctx) | ||
} | ||
}) | ||
break | ||
} | ||
case 'operand-expr': { | ||
resolveName(node.operand, ctx) | ||
break | ||
} | ||
case 'unary-expr': { | ||
resolveName(node.operand, ctx) | ||
resolveName(node.op, ctx) | ||
break | ||
} | ||
case 'binary-expr': { | ||
resolveName(node.lOperand, ctx) | ||
resolveName(node.rOperand, ctx) | ||
resolveName(node.binaryOp, ctx) | ||
break | ||
} | ||
case 'closure-expr': { | ||
withScope(ctx, () => { | ||
node.params.forEach(p => resolveName(p, ctx)) | ||
if (node.returnType) { | ||
resolveName(node.returnType, ctx) | ||
} | ||
resolveName(node.block, ctx) | ||
}) | ||
break | ||
} | ||
case 'list-expr': { | ||
node.exprs.forEach(e => resolveName(e, ctx)) | ||
break | ||
} | ||
case 'while-expr': { | ||
resolveName(node.condition, ctx) | ||
resolveName(node.block, ctx) | ||
break | ||
} | ||
case 'for-expr': { | ||
withScope(ctx, () => { | ||
resolveName(node.pattern, ctx) | ||
resolveName(node.expr, ctx) | ||
resolveName(node.block, ctx) | ||
}) | ||
break | ||
} | ||
case 'match-expr': { | ||
resolveName(node.expr, ctx) | ||
node.clauses.forEach(c => resolveName(c, ctx)) | ||
break | ||
} | ||
case 'var-def': { | ||
resolveName(node.pattern, ctx) | ||
if (node.expr) { | ||
resolveName(node.expr, ctx) | ||
} | ||
if (node.varType) { | ||
resolveName(node.varType, ctx) | ||
} | ||
break | ||
} | ||
case 'fn-def': { | ||
withScope(ctx, () => { | ||
node.generics.forEach(g => resolveName(g, ctx)) | ||
node.params.forEach(p => resolveName(p, ctx)) | ||
if (node.returnType) { | ||
resolveName(node.returnType, ctx) | ||
} | ||
if (node.block) { | ||
resolveName(node.block, ctx) | ||
} | ||
}) | ||
break | ||
} | ||
case 'trait-def': { | ||
withScope(ctx, () => { | ||
node.generics.forEach(g => resolveName(g, ctx)) | ||
if (node.block) { | ||
resolveName(node.block, ctx) | ||
} | ||
}) | ||
break | ||
} | ||
case 'impl-def': { | ||
withScope(ctx, () => { | ||
node.generics.forEach(g => resolveName(g, ctx)) | ||
resolveName(node.identifier, ctx) | ||
if (node.forTrait) { | ||
resolveName(node.forTrait, ctx) | ||
} | ||
if (node.block) { | ||
resolveName(node.block, ctx) | ||
} | ||
}) | ||
break | ||
} | ||
case 'type-def': { | ||
withScope(ctx, () => { | ||
node.generics.forEach(g => resolveName(g, ctx)) | ||
node.variants.forEach(v => resolveName(v, ctx)) | ||
}) | ||
break | ||
} | ||
case 'field-def': { | ||
resolveName(node.fieldType, ctx) | ||
break | ||
} | ||
case 'method-call-op': { | ||
resolveName(node.call, ctx) | ||
node.typeArgs.forEach(a => resolveName(a, ctx)) | ||
// methods are checked after type resolution since types are not known yet | ||
break | ||
} | ||
case 'field-access-op': { | ||
// fields are checked after type resolution since types are not known yet | ||
break | ||
} | ||
case 'call-op': { | ||
node.args.forEach(a => resolveName(a, ctx)) | ||
break | ||
} | ||
} | ||
m.astStack.pop() | ||
} | ||
|
||
const addDef = (name: string, def: Definition, ctx: Context): void => { | ||
const m = ctx.moduleStack.at(-1)! | ||
const scope = m.scopeStack.at(-1) ?? m.topScope | ||
if (scope.has(name)) { | ||
// TODO: error | ||
} | ||
scope.set(name, def) | ||
} | ||
|
||
const findParent = (ctx: Context, ofKind: AstNodeKind[]): AstNode | undefined => { | ||
const m = ctx.moduleStack.at(-1)! | ||
return m.astStack.toReversed().find(n => ofKind.includes(n.kind)) | ||
} | ||
|
||
const findName = (name: Name, ctx: Context): Definition | undefined => { | ||
const m = ctx.moduleStack.at(-1)! | ||
for (const stack of [...m.scopeStack.toReversed(), m.topScope]) { | ||
const def = findNameInStack(name, stack) | ||
if (def) return def | ||
} | ||
return undefined | ||
} | ||
const findNameInStack = (name: Name, stack: DefinitionMap): Definition | undefined => { | ||
return stack.get(defKey(name)) | ||
} | ||
|
||
const withScope = <T>(ctx: Context, f: () => T): T => { | ||
const m = ctx.moduleStack.at(-1)! | ||
m.scopeStack.push(new Map()) | ||
const res = f() | ||
m.scopeStack.pop() | ||
return res | ||
} |