day 19, part 1
This commit is contained in:
parent
4c80ebd83a
commit
8a975abe72
2 changed files with 235 additions and 0 deletions
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@ -23,6 +23,9 @@
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26BD88A5258C818300E92A8E /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26BD88A4258C818300E92A8E /* main.swift */; };
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26BD88BB258C818E00E92A8E /* LoadData.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2AD3A2581713A00702405 /* LoadData.swift */; };
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26BD88BC258C818E00E92A8E /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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26DD9C41258DEAC70082D4F2 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26DD9C40258DEAC70082D4F2 /* main.swift */; };
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26DD9C58258DEACF0082D4F2 /* LoadData.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2AD3A2581713A00702405 /* LoadData.swift */; };
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26DD9C59258DEACF0082D4F2 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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26E2ACD8257ECFFA00702405 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACD7257ECFFA00702405 /* main.swift */; };
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26E2ACE6257ED09000702405 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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26E2ACE7257ED09000702405 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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@ -154,6 +157,15 @@
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);
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runOnlyForDeploymentPostprocessing = 1;
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};
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26DD9C3C258DEAC70082D4F2 /* CopyFiles */ = {
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isa = PBXCopyFilesBuildPhase;
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buildActionMask = 2147483647;
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dstPath = /usr/share/man/man1/;
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dstSubfolderSpec = 0;
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files = (
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);
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runOnlyForDeploymentPostprocessing = 1;
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};
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26E2ACD3257ECFFA00702405 /* CopyFiles */ = {
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isa = PBXCopyFilesBuildPhase;
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buildActionMask = 2147483647;
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@ -249,6 +261,8 @@
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26BD8864258B2D5300E92A8E /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26BD88A2258C818300E92A8E /* day18 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = day18; sourceTree = BUILT_PRODUCTS_DIR; };
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26BD88A4258C818300E92A8E /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26DD9C3E258DEAC70082D4F2 /* day19 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = day19; sourceTree = BUILT_PRODUCTS_DIR; };
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26DD9C40258DEAC70082D4F2 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26E2ACD5257ECFFA00702405 /* day8 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = day8; sourceTree = BUILT_PRODUCTS_DIR; };
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26E2ACD7257ECFFA00702405 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26E2ACE5257ED09000702405 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
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@ -340,6 +354,13 @@
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);
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runOnlyForDeploymentPostprocessing = 0;
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};
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26DD9C3B258DEAC70082D4F2 /* Frameworks */ = {
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isa = PBXFrameworksBuildPhase;
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buildActionMask = 2147483647;
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files = (
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);
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runOnlyForDeploymentPostprocessing = 0;
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};
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26E2ACD2257ECFFA00702405 /* Frameworks */ = {
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isa = PBXFrameworksBuildPhase;
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buildActionMask = 2147483647;
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@ -437,6 +458,7 @@
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261C554625895FB70035FEC0 /* day16 */,
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26BD8863258B2D5300E92A8E /* day17 */,
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26BD88A3258C818300E92A8E /* day18 */,
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26DD9C3F258DEAC70082D4F2 /* day19 */,
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268D953A25781DD80030EC4D /* Products */,
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);
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sourceTree = "<group>";
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@ -462,6 +484,7 @@
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261C554525895FB70035FEC0 /* day16 */,
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26BD8862258B2D5300E92A8E /* day17 */,
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26BD88A2258C818300E92A8E /* day18 */,
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26DD9C3E258DEAC70082D4F2 /* day19 */,
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);
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name = Products;
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sourceTree = "<group>";
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@ -530,6 +553,14 @@
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path = day18;
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sourceTree = "<group>";
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};
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26DD9C3F258DEAC70082D4F2 /* day19 */ = {
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isa = PBXGroup;
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children = (
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26DD9C40258DEAC70082D4F2 /* main.swift */,
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);
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path = day19;
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sourceTree = "<group>";
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};
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26E2ACD6257ECFFA00702405 /* day8 */ = {
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isa = PBXGroup;
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children = (
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@ -776,6 +807,23 @@
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productReference = 26BD88A2258C818300E92A8E /* day18 */;
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productType = "com.apple.product-type.tool";
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};
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26DD9C3D258DEAC70082D4F2 /* day19 */ = {
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isa = PBXNativeTarget;
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buildConfigurationList = 26DD9C44258DEAC70082D4F2 /* Build configuration list for PBXNativeTarget "day19" */;
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buildPhases = (
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26DD9C3A258DEAC70082D4F2 /* Sources */,
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26DD9C3B258DEAC70082D4F2 /* Frameworks */,
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26DD9C3C258DEAC70082D4F2 /* CopyFiles */,
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);
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buildRules = (
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);
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dependencies = (
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);
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name = day19;
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productName = day19;
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productReference = 26DD9C3E258DEAC70082D4F2 /* day19 */;
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productType = "com.apple.product-type.tool";
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};
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26E2ACD4257ECFFA00702405 /* day8 */ = {
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isa = PBXNativeTarget;
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buildConfigurationList = 26E2ACDB257ECFFA00702405 /* Build configuration list for PBXNativeTarget "day8" */;
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@ -951,6 +999,9 @@
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26BD88A1258C818300E92A8E = {
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CreatedOnToolsVersion = 12.3;
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};
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26DD9C3D258DEAC70082D4F2 = {
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CreatedOnToolsVersion = 12.3;
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};
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26E2ACD4257ECFFA00702405 = {
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CreatedOnToolsVersion = 12.2;
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};
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@ -1008,6 +1059,7 @@
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261C554425895FB70035FEC0 /* day16 */,
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26BD8861258B2D5300E92A8E /* day17 */,
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26BD88A1258C818300E92A8E /* day18 */,
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26DD9C3D258DEAC70082D4F2 /* day19 */,
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);
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};
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/* End PBXProject section */
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@ -1113,6 +1165,16 @@
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);
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runOnlyForDeploymentPostprocessing = 0;
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};
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26DD9C3A258DEAC70082D4F2 /* Sources */ = {
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isa = PBXSourcesBuildPhase;
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buildActionMask = 2147483647;
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files = (
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26DD9C41258DEAC70082D4F2 /* main.swift in Sources */,
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26DD9C59258DEACF0082D4F2 /* Extensions.swift in Sources */,
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26DD9C58258DEACF0082D4F2 /* LoadData.swift in Sources */,
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);
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runOnlyForDeploymentPostprocessing = 0;
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};
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26E2ACD1257ECFFA00702405 /* Sources */ = {
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isa = PBXSourcesBuildPhase;
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buildActionMask = 2147483647;
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@ -1549,6 +1611,28 @@
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};
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name = Release;
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};
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26DD9C42258DEAC70082D4F2 /* Debug */ = {
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isa = XCBuildConfiguration;
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buildSettings = {
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CODE_SIGN_STYLE = Automatic;
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DEVELOPMENT_TEAM = 722B335UM5;
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ENABLE_HARDENED_RUNTIME = YES;
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PRODUCT_NAME = "$(TARGET_NAME)";
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SWIFT_VERSION = 5.0;
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};
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name = Debug;
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};
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26DD9C43258DEAC70082D4F2 /* Release */ = {
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isa = XCBuildConfiguration;
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buildSettings = {
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CODE_SIGN_STYLE = Automatic;
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DEVELOPMENT_TEAM = 722B335UM5;
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ENABLE_HARDENED_RUNTIME = YES;
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PRODUCT_NAME = "$(TARGET_NAME)";
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SWIFT_VERSION = 5.0;
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};
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name = Release;
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};
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26E2ACD9257ECFFA00702405 /* Debug */ = {
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isa = XCBuildConfiguration;
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buildSettings = {
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@ -1843,6 +1927,15 @@
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defaultConfigurationIsVisible = 0;
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defaultConfigurationName = Release;
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};
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26DD9C44258DEAC70082D4F2 /* Build configuration list for PBXNativeTarget "day19" */ = {
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isa = XCConfigurationList;
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buildConfigurations = (
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26DD9C42258DEAC70082D4F2 /* Debug */,
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26DD9C43258DEAC70082D4F2 /* Release */,
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);
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defaultConfigurationIsVisible = 0;
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defaultConfigurationName = Release;
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};
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26E2ACDB257ECFFA00702405 /* Build configuration list for PBXNativeTarget "day8" */ = {
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isa = XCConfigurationList;
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buildConfigurations = (
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142
day19/main.swift
Normal file
142
day19/main.swift
Normal file
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@ -0,0 +1,142 @@
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import Foundation
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let input = loadData(day: 19)
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let scanner = Scanner(string: input)
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scanner.charactersToBeSkipped = .whitespaces
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enum Rule {
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case character(Character)
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indirect case sequence(Rule, Rule)
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indirect case alternative(Rule, Rule)
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case reference(Int)
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}
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typealias RuleSet = [Int: Rule]
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extension Scanner {
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func parseRuleSet() -> RuleSet {
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var result: [Int: Rule] = [:]
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while !string("\n") {
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guard let (index, rule) = parseRuleDefinition() else { fatalError() }
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result[index] = rule
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}
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return result
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}
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func parseRuleDefinition() -> (Int, Rule)? {
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guard let label = parseLabel(),
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let rule = parseRule(),
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string("\n")
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else { return nil }
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return (label, rule)
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}
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func parseLabel() -> Int? {
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guard let num = scanInt(),
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string(":")
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else { return nil }
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return num
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}
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func parseRule() -> Rule? {
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if string("\""), let character = scanCharacter(), string("\"") {
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return .character(character)
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}
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guard let sequence = parseSequence() else { return nil }
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if string("|"), let rhs = parseSequence() {
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return .alternative(sequence, rhs)
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}
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return sequence
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}
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func parseReference() -> Rule? {
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guard let num = scanInt() else { return nil }
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return .reference(num)
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}
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func parseSequence() -> Rule? {
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guard var sequence = parseReference() else {
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return nil
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}
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while let rhs = parseReference() {
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sequence = .sequence(sequence, rhs)
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}
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return sequence
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}
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}
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let rules = scanner.parseRuleSet()
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extension Rule {
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func matches(rules: RuleSet, _ s: Substring) -> Substring? {
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switch self {
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case .character(let ch):
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if s.first == ch {
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return s.dropFirst()
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}
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return nil
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case let .sequence(first, second):
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if let firstMatch = first.matches(rules: rules, s), let secondMatch = second.matches(rules: rules, firstMatch) {
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return secondMatch
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}
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return nil
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case let .alternative(first, second):
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if let firstMatch = first.matches(rules: rules, s) {
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return firstMatch
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}
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if let secondMatch = second.matches(rules: rules, s) {
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return secondMatch
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}
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return nil
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case .reference(let index):
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return rules[index]!.matches(rules: rules, s)
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}
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}
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func matches(rules: RuleSet, _ s: String) -> Bool {
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if let result = matches(rules: rules, s[...]), result.isEmpty {
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return true
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}
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return false
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}
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}
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extension Scanner {
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func scanLine() -> String? {
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guard let result = scanUpToCharacters(from: .newlines),
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scanCharacters(from: .newlines) != nil else {
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return nil
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}
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return result
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}
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func readLines() -> [String] {
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var lines = [String]()
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while let line = scanner.scanLine() {
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lines.append(line)
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}
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return lines
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}
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}
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let messages = scanner.readLines()
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print("part 1", messages.lazy.filter { rules[0]!.matches(rules: rules, $0) }.count)
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