Initial open source commit

app/coffee/RequestParser.coffee

@@ -0,0 +1,74 @@
+module.exports = RequestParser =
+	VALID_COMPILERS: ["pdflatex", "latex", "xelatex", "lualatex"]
+	MAX_TIMEOUT: 60
+
+	parse: (body, callback = (error, data) ->) ->
+		response = {}
+
+		if !body.compile?
+			return callback "top level object should have a compile attribute"
+
+		compile = body.compile
+		compile.options ||= {}
+		
+		try
+			response.compiler = @_parseAttribute "compiler",
+				compile.options.compiler,
+				validValues: @VALID_COMPILERS
+				default: "pdflatex"
+				type: "string"
+			response.timeout = @_parseAttribute "timeout",
+				compile.options.timeout
+				default: RequestParser.MAX_TIMEOUT
+				type: "number"
+
+			if response.timeout > RequestParser.MAX_TIMEOUT
+				response.timeout = RequestParser.MAX_TIMEOUT
+			response.timeout = response.timeout * 1000 # milliseconds
+
+			response.resources = (@_parseResource(resource) for resource in (compile.resources or []))
+			response.rootResourcePath = @_parseAttribute "rootResourcePath",
+				compile.rootResourcePath
+				default: "main.tex"
+				type: "string"
+		catch error
+			return callback error
+
+		callback null, response
+
+	_parseResource: (resource) ->
+		if !resource.path? or typeof resource.path != "string"
+			throw "all resources should have a path attribute"
+
+		if resource.modified?
+			modified = new Date(resource.modified)
+			if isNaN(modified.getTime())
+				throw "resource modified date could not be understood: #{resource.modified}"
+
+		if !resource.url? and !resource.content?
+		   	throw "all resources should have either a url or content attribute"
+		if resource.content? and typeof resource.content != "string"
+			throw "content attribute should be a string"
+		if resource.url? and typeof resource.url != "string"
+			throw "url attribute should be a string"
+
+		return {
+			path: resource.path
+			modified: modified
+			url: resource.url
+			content: resource.content
+		}
+
+	_parseAttribute: (name, attribute, options) ->
+		if attribute?
+			if options.validValues?
+				if options.validValues.indexOf(attribute) == -1
+					throw "#{name} attribute should be one of: #{options.validValues.join(", ")}"
+			if options.type?
+				if typeof attribute != options.type
+					throw "#{name} attribute should be a #{options.type}"
+		else
+			return options.default if options.default?
+			throw "Default not implemented"
+		return attribute
+