60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
#include "spec_helper.h"
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#include "compiler/build_tables/rule_can_be_blank.h"
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#include "compiler/rules/metadata.h"
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#include "compiler/rules.h"
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#include "helpers/rule_helpers.h"
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using namespace rules;
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using build_tables::rule_can_be_blank;
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START_TEST
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describe("rule_can_be_blank", [&]() {
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rule_ptr rule;
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it("returns false for basic rules", [&]() {
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AssertThat(rule_can_be_blank(i_sym(3)), IsFalse());
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AssertThat(rule_can_be_blank(str("x")), IsFalse());
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AssertThat(rule_can_be_blank(pattern("x")), IsFalse());
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});
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it("returns true for blanks", [&]() {
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AssertThat(rule_can_be_blank(blank()), IsTrue());
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});
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it("returns true for repeats", [&]() {
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AssertThat(rule_can_be_blank(repeat(str("x"))), IsTrue());
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});
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it("returns true for choices iff one or more sides can be blank", [&]() {
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rule = choice({ sym("x"), blank() });
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AssertThat(rule_can_be_blank(rule), IsTrue());
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rule = choice({ blank(), sym("x") });
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AssertThat(rule_can_be_blank(rule), IsTrue());
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rule = choice({ sym("x"), sym("y") });
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AssertThat(rule_can_be_blank(rule), IsFalse());
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});
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it("returns true for sequences iff both sides can be blank", [&]() {
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rule = seq({ blank(), str("x") });
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AssertThat(rule_can_be_blank(rule), IsFalse());
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rule = seq({ str("x"), blank() });
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AssertThat(rule_can_be_blank(rule), IsFalse());
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rule = seq({ blank(), choice({ sym("x"), blank() }) });
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AssertThat(rule_can_be_blank(rule), IsTrue());
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});
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it("ignores metadata rules", [&]() {
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rule = make_shared<rules::Metadata>(blank(), map<rules::MetadataKey, int>());
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AssertThat(rule_can_be_blank(rule), IsTrue());
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rule = make_shared<rules::Metadata>(sym("one"), map<rules::MetadataKey, int>());
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AssertThat(rule_can_be_blank(rule), IsFalse());
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});
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});
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END_TEST
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