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Use enum instead of pair as result type for Template

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This commit is contained in:
Marius Rackwitz
2014-10-26 13:24:50 +00:00
parent 7b89c32295
commit 25b86dea93
6 changed files with 53 additions and 17 deletions
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12
Stencil.xcodeproj/project.pbxproj
View File

@@ -7,6 +7,7 @@
objects = {
/* Begin PBXBuildFile section */
71CE4C0A19FD29D000B9E0C5 /* Result.swift in Sources */ = {isa = PBXBuildFile; fileRef = 71CE4C0919FD29D000B9E0C5 /* Result.swift */; };
7725B3CB19F92B4F002CF74B /* VariableTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7725B3CA19F92B4F002CF74B /* VariableTests.swift */; };
7725B3CD19F92B61002CF74B /* Variable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7725B3CC19F92B61002CF74B /* Variable.swift */; };
7725B3CF19F94214002CF74B /* Tokenizer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7725B3CE19F94214002CF74B /* Tokenizer.swift */; };
@@ -36,6 +37,7 @@
/* End PBXContainerItemProxy section */
/* Begin PBXFileReference section */
71CE4C0919FD29D000B9E0C5 /* Result.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Result.swift; sourceTree = "<group>"; };
7725B3CA19F92B4F002CF74B /* VariableTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = VariableTests.swift; sourceTree = "<group>"; };
7725B3CC19F92B61002CF74B /* Variable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Variable.swift; sourceTree = "<group>"; };
7725B3CE19F94214002CF74B /* Tokenizer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Tokenizer.swift; sourceTree = "<group>"; };
@@ -97,14 +99,15 @@
77FAAE5419F91E480029DC5E /* Stencil */ = {
isa = PBXGroup;
children = (
77FAAE5719F91E480029DC5E /* Stencil.h */,
77FAAE6E19F920750029DC5E /* Context.swift */,
7725B3CC19F92B61002CF74B /* Variable.swift */,
7725B3CE19F94214002CF74B /* Tokenizer.swift */,
77EB082A19FA8600001870F1 /* Lexer.swift */,
7725B3D419F9438F002CF74B /* Node.swift */,
7725B3D619F94A43002CF74B /* Parser.swift */,
77EB082A19FA8600001870F1 /* Lexer.swift */,
71CE4C0919FD29D000B9E0C5 /* Result.swift */,
77FAAE5719F91E480029DC5E /* Stencil.h */,
77EB082419F96E88001870F1 /* Template.swift */,
7725B3CE19F94214002CF74B /* Tokenizer.swift */,
7725B3CC19F92B61002CF74B /* Variable.swift */,
77FAAE5519F91E480029DC5E /* Supporting Files */,
);
path = Stencil;
@@ -254,6 +257,7 @@
7725B3D719F94A43002CF74B /* Parser.swift in Sources */,
77EB082519F96E88001870F1 /* Template.swift in Sources */,
7725B3CD19F92B61002CF74B /* Variable.swift in Sources */,
71CE4C0A19FD29D000B9E0C5 /* Result.swift in Sources */,
7725B3D519F9438F002CF74B /* Node.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;

4
Stencil/Node.swift
View File

@@ -8,10 +8,6 @@
import Foundation
public protocol Error : Printable {
}
struct NodeError : Error {
let token:Token
let message:String

33
Stencil/Result.swift Normal file
View File

@@ -0,0 +1,33 @@
//
// Result.swift
// Stencil
//
// Created by Marius Rackwitz on 26/10/14.
// Copyright (c) 2014 Cocode. All rights reserved.
//
import Foundation
public protocol Error : Printable {
}
public func ==(lhs:Error, rhs:Error) -> Bool {
return lhs.description == rhs.description
}
public enum Result : Equatable {
case Success(string: String)
case Error(error: Stencil.Error)
}
public func ==(lhs:Result, rhs:Result) -> Bool {
switch (lhs, rhs) {
case (.Success(let lhsValue), .Success(let rhsValue)):
return lhsValue == rhsValue
case (.Error(let lhsValue), .Error(let rhsValue)):
return lhsValue == rhsValue
default:
return false
}
}

14
Stencil/Template.swift
View File

@@ -44,15 +44,19 @@ public class Template {
parser = TokenParser(tokens: tokens)
}
public func render(context:Context) -> (string:String?, error:Error?) {
public func render(context:Context) -> Result {
let (nodes, error) = parser.parse()
if let error = error {
return (nil, error)
return .Error(error: error)
} else if let nodes = nodes {
return renderNodes(nodes, context)
let result = renderNodes(nodes, context)
if let string = result.0 {
return .Success(string: string)
} else {
return .Error(error: result.1!)
}
}
return (nil, nil)
return .Success(string: "")
}
}

2
StencilTests/StencilTests.swift
View File

@@ -34,6 +34,6 @@ class StencilTests: XCTestCase {
" - Memory Management with ARC by Kyle Fuller.\n" +
"\n"
XCTAssertEqual(result.string!, fixture)
XCTAssertEqual(result, Result.Success(string: fixture))
}
}

5
StencilTests/TemplateTests.swift
View File

@@ -15,9 +15,8 @@ class TemplateTests: XCTestCase {
func testTemplate() {
let context = Context(dictionary: [ "name": "Kyle" ])
let template = Template(templateString: "Hello World")
let (string, error) = template.render(context)
XCTAssertEqual(string!, "Hello World")
XCTAssertTrue(error == nil)
let result = template.render(context)
XCTAssertEqual(result, Result.Success(string: "Hello World"))
}
}