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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package html

import (
        "strings"
)

// parseDoctype parses the data from a DoctypeToken into a name,
// public identifier, and system identifier. It returns a Node whose Type 
// is DoctypeNode, whose Data is the name, and which has attributes
// named "system" and "public" for the two identifiers if they were present.
// quirks is whether the document should be parsed in "quirks mode".
func parseDoctype(s string) (n *Node, quirks bool) {
        n = &Node{Type: DoctypeNode}

        // Find the name.
        space := strings.IndexAny(s, whitespace)
        if space == -1 {
                space = len(s)
        }
        n.Data = s[:space]
        // The comparison to "html" is case-sensitive.
        if n.Data != "html" {
                quirks = true
        }
        n.Data = strings.ToLower(n.Data)
        s = strings.TrimLeft(s[space:], whitespace)

        if len(s) < 6 {
                // It can't start with "PUBLIC" or "SYSTEM".
                // Ignore the rest of the string.
                return n, quirks || s != ""
        }

        key := strings.ToLower(s[:6])
        s = s[6:]
        for key == "public" || key == "system" {
                s = strings.TrimLeft(s, whitespace)
                if s == "" {
                        break
                }
                quote := s[0]
                if quote != '"' && quote != '\'' {
                        break
                }
                s = s[1:]
                q := strings.IndexRune(s, rune(quote))
                var id string
                if q == -1 {
                        id = s
                        s = ""
                } else {
                        id = s[:q]
                        s = s[q+1:]
                }
                n.Attr = append(n.Attr, Attribute{Key: key, Val: id})
                if key == "public" {
                        key = "system"
                } else {
                        key = ""
                }
        }

        if key != "" || s != "" {
                quirks = true
        } else if len(n.Attr) > 0 {
                if n.Attr[0].Key == "public" {
                        public := strings.ToLower(n.Attr[0].Val)
                        switch public {
                        case "-//w3o//dtd w3 html strict 3.0//en//", "-/w3d/dtd html 4.0 transitional/en", "html":
                                quirks = true
                        default:
                                for _, q := range quirkyIDs {
                                        if strings.HasPrefix(public, q) {
                                                quirks = true
                                                break
                                        }
                                }
                        }
                        // The following two public IDs only cause quirks mode if there is no system ID.
                        if len(n.Attr) == 1 && (strings.HasPrefix(public, "-//w3c//dtd html 4.01 frameset//") ||
                                strings.HasPrefix(public, "-//w3c//dtd html 4.01 transitional//")) {
                                quirks = true
                        }
                }
                if lastAttr := n.Attr[len(n.Attr)-1]; lastAttr.Key == "system" &&
                        strings.ToLower(lastAttr.Val) == "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd" {
                        quirks = true
                }
        }

        return n, quirks
}

// quirkyIDs is a list of public doctype identifiers that cause a document
// to be interpreted in quirks mode. The identifiers should be in lower case.
var quirkyIDs = []string{
        "+//silmaril//dtd html pro v0r11 19970101//",
        "-//advasoft ltd//dtd html 3.0 aswedit + extensions//",
        "-//as//dtd html 3.0 aswedit + extensions//",
        "-//ietf//dtd html 2.0 level 1//",
        "-//ietf//dtd html 2.0 level 2//",
        "-//ietf//dtd html 2.0 strict level 1//",
        "-//ietf//dtd html 2.0 strict level 2//",
        "-//ietf//dtd html 2.0 strict//",
        "-//ietf//dtd html 2.0//",
        "-//ietf//dtd html 2.1e//",
        "-//ietf//dtd html 3.0//",
        "-//ietf//dtd html 3.2 final//",
        "-//ietf//dtd html 3.2//",
        "-//ietf//dtd html 3//",
        "-//ietf//dtd html level 0//",
        "-//ietf//dtd html level 1//",
        "-//ietf//dtd html level 2//",
        "-//ietf//dtd html level 3//",
        "-//ietf//dtd html strict level 0//",
        "-//ietf//dtd html strict level 1//",
        "-//ietf//dtd html strict level 2//",
        "-//ietf//dtd html strict level 3//",
        "-//ietf//dtd html strict//",
        "-//ietf//dtd html//",
        "-//metrius//dtd metrius presentational//",
        "-//microsoft//dtd internet explorer 2.0 html strict//",
        "-//microsoft//dtd internet explorer 2.0 html//",
        "-//microsoft//dtd internet explorer 2.0 tables//",
        "-//microsoft//dtd internet explorer 3.0 html strict//",
        "-//microsoft//dtd internet explorer 3.0 html//",
        "-//microsoft//dtd internet explorer 3.0 tables//",
        "-//netscape comm. corp.//dtd html//",
        "-//netscape comm. corp.//dtd strict html//",
        "-//o'reilly and associates//dtd html 2.0//",
        "-//o'reilly and associates//dtd html extended 1.0//",
        "-//o'reilly and associates//dtd html extended relaxed 1.0//",
        "-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//",
        "-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//",
        "-//spyglass//dtd html 2.0 extended//",
        "-//sq//dtd html 2.0 hotmetal + extensions//",
        "-//sun microsystems corp.//dtd hotjava html//",
        "-//sun microsystems corp.//dtd hotjava strict html//",
        "-//w3c//dtd html 3 1995-03-24//",
        "-//w3c//dtd html 3.2 draft//",
        "-//w3c//dtd html 3.2 final//",
        "-//w3c//dtd html 3.2//",
        "-//w3c//dtd html 3.2s draft//",
        "-//w3c//dtd html 4.0 frameset//",
        "-//w3c//dtd html 4.0 transitional//",
        "-//w3c//dtd html experimental 19960712//",
        "-//w3c//dtd html experimental 970421//",
        "-//w3c//dtd w3 html//",
        "-//w3o//dtd w3 html 3.0//",
        "-//webtechs//dtd mozilla html 2.0//",
        "-//webtechs//dtd mozilla html//",
}