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Allow lexer to accept tokens that ended at previous positions

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* Track lookahead in each tree
* Add 'mark_end' API that external scanners can use
This commit is contained in:
Max Brunsfeld 2017-03-13 17:03:47 -07:00
parent 12d2a9d93f
commit d222dbb9fd
12 changed files with 96 additions and 71 deletions
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5
test/compiler/build_tables/lex_conflict_manager_test.cc
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@ -69,18 +69,15 @@ describe("LexConflictManager::resolve(new_action, old_action)", []() {
describe("advance/accept-token conflicts", [&]() {
describe("when the token to accept has higher precedence", [&]() {
it("prefers the accept-token action", [&]() {
AssertThat(conflict_manager.possible_extensions, IsEmpty());
update = conflict_manager.resolve(item_set, AdvanceAction(1, { 1, 2 }, true), AcceptTokenAction(sym3, 3, true));
AssertThat(update, IsFalse());
AssertThat(conflict_manager.possible_extensions, IsEmpty());
});
});
describe("when the token to accept does not have a higher precedence", [&]() {
it("favors the advance action and adds the in-progress tokens as possible extensions of the discarded token", [&]() {
it("favors the advance action", [&]() {
update = conflict_manager.resolve(item_set, AdvanceAction(1, { 1, 2 }, true), AcceptTokenAction(sym3, 2, true));
AssertThat(update, IsTrue());
AssertThat(conflict_manager.possible_extensions[sym3.index], Contains(sym4.index));
});
});
});