81 lines
3.0 KiB
Swift
81 lines
3.0 KiB
Swift
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extension HBMustacheTemplate {
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static func parse(_ string: String) throws -> [Token] {
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var parser = HBParser(string)
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return try parse(&parser, sectionName: nil)
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}
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static func parse(_ parser: inout HBParser, sectionName: String?) throws -> [Token] {
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var tokens: [Token] = []
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while !parser.reachedEnd() {
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let text = try parser.read(untilString: "{{", throwOnOverflow: false, skipToEnd: true)
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tokens.append(.text(text.string))
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if parser.reachedEnd() {
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break
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}
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switch parser.current() {
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case "#":
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parser.unsafeAdvance()
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let name = try parseSectionName(&parser)
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if parser.current() == "\n" {
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parser.unsafeAdvance()
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}
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let sectionTokens = try parse(&parser, sectionName: name)
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tokens.append(.section(name, HBMustacheTemplate(sectionTokens)))
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case "^":
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parser.unsafeAdvance()
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let name = try parseSectionName(&parser)
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if parser.current() == "\n" {
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parser.unsafeAdvance()
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}
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let sectionTokens = try parse(&parser, sectionName: name)
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tokens.append(.invertedSection(name, HBMustacheTemplate(sectionTokens)))
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case "/":
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parser.unsafeAdvance()
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let name = try parseSectionName(&parser)
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guard name == sectionName else {
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throw HBMustacheError.sectionCloseNameIncorrect
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}
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if parser.current() == "\n" {
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parser.unsafeAdvance()
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}
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return tokens
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case "{":
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parser.unsafeAdvance()
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let name = try parseSectionName(&parser)
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guard try parser.read("}") else { throw HBMustacheError.unfinishedSectionName }
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tokens.append(.unescapedVariable(name))
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case "!":
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parser.unsafeAdvance()
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_ = try parseSection(&parser)
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default:
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let name = try parseSectionName(&parser)
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tokens.append(.variable(name))
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}
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}
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// should never get here if reading section
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guard sectionName == nil else {
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throw HBMustacheError.expectedSectionEnd
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}
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return tokens
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}
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static func parseSectionName(_ parser: inout HBParser) throws -> String {
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let text = parser.read(while: sectionNameChars )
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guard try parser.read("}"), try parser.read("}") else { throw HBMustacheError.unfinishedSectionName }
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return text.string
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}
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static func parseSection(_ parser: inout HBParser) throws -> String {
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let text = try parser.read(untilString: "}}", throwOnOverflow: true, skipToEnd: true)
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return text.string
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}
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private static let sectionNameChars = Set<Unicode.Scalar>("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ._?")
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}
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