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Copy pathsax.js
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535 lines (525 loc) · 17.6 KB
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var sax = exports;
sax.parser = function (strict, opt) { return new SAXParser(strict, opt) };
sax.SAXParser = SAXParser;
function SAXParser (strict, opt) {
this.c = this.comment = this.sgmlDecl =
this.textNode = this.tagName = this.doctype =
this.procInstName = this.procInstBody = this.entity =
this.attribName = this.attribValue = this.q =
this.cdata = this.sgmlDecl = "";
this.opt = opt || {};
this.tagCase = this.opt.lowercasetags ? "toLowerCase" : "toUpperCase";
this.tags = [];
this.closed = this.closedRoot = this.sawRoot = false;
this.tag = this.error = null;
this.strict = !!strict;
this.state = S.BEGIN;
this.ENTITIES = Object.create(sax.ENTITIES);
// just for error reporting
this.position = this.line = this.column = 0;
emit(this, "onready");
}
SAXParser.prototype = {
write : write,
resume : function () { this.error = null; return this },
close : function () { return this.write(null) },
}
// character classes and tokens
var whitespace = "\r\n\t ",
// this really needs to be replaced with character classes.
// XML allows all manner of ridiculous numbers and digits.
number = "0124356789",
letter = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
// (Letter | '_' | ':')
nameStart = letter+"_:",
nameBody = nameStart+number+"-.",
quote = "'\"",
entity = number+letter+"#",
CDATA = "[CDATA[",
DOCTYPE = "DOCTYPE";
function is (charclass, c) { return charclass.indexOf(c) !== -1 }
function not (charclass, c) { return !is(charclass, c) }
var S = 0;
sax.STATE =
{ BEGIN : S++
, TEXT : S++ // general stuff
, TEXT_ENTITY : S++ // & and such.
, OPEN_WAKA : S++ // <
, SGML_DECL : S++ // <!BLARG
, SGML_DECL_QUOTED : S++ // <!BLARG foo "bar
, DOCTYPE : S++ // <!DOCTYPE
, DOCTYPE_QUOTED : S++ // <!DOCTYPE "//blah
, DOCTYPE_DTD : S++ // <!DOCTYPE "//blah" [ ...
, DOCTYPE_DTD_QUOTED : S++ // <!DOCTYPE "//blah" [ "foo
, COMMENT_STARTING : S++ // <!-
, COMMENT : S++ // <!--
, COMMENT_ENDING : S++ // <!-- blah -
, COMMENT_ENDED : S++ // <!-- blah --
, CDATA : S++ // <![CDATA[ something
, CDATA_ENDING : S++ // ]
, CDATA_ENDING_2 : S++ // ]]
, PROC_INST : S++ // <?hi
, PROC_INST_BODY : S++ // <?hi there
, PROC_INST_QUOTED : S++ // <?hi there
, PROC_INST_ENDING : S++ // <?hi there ?
, OPEN_TAG : S++ // <strong
, OPEN_TAG_SLASH : S++ // <strong /
, ATTRIB : S++ // <a
, ATTRIB_NAME : S++ // <a foo
, ATTRIB_NAME_SAW_WHITE : S++ // <a foo _
, ATTRIB_VALUE : S++ // <a foo="bar
, ATTRIB_VALUE_QUOTED : S++ // <a foo="bar
, ATTRIB_VALUE_UNQUOTED : S++ // <a foo="bar
, ATTRIB_VALUE_ENTITY_Q : S++ // <foo bar="""
, ATTRIB_VALUE_ENTITY_U : S++ // <foo bar="
, CLOSE_TAG : S++ // </a
, CLOSE_TAG_SAW_WHITE : S++ // </a >
}
sax.ENTITIES =
{ "apos" : "'"
, "quot" : '"'
, "amp" : "&"
, "gt" : ">"
, "lt" : "<"
}
for (var S in sax.STATE) sax.STATE[sax.STATE[S]] = S;
// shorthand
S = sax.STATE;
sax.EVENTS = [ // for discoverability.
"text", "processinginstruction", "sgmldeclaration",
"doctype", "comment", "attribute", "opentag", "closetag",
"cdata", "error", "end", "ready" ];
function emit (parser, event, data) {
parser[event] && parser[event](data);
}
function emitNode (parser, nodeType, data) {
if (parser.textNode) closeText(parser);
emit(parser, nodeType, data);
}
function closeText (parser) {
parser.textNode = textopts(parser.opt, parser.textNode);
if (parser.textNode) emit(parser, "ontext", parser.textNode);
parser.textNode = "";
}
function textopts (opt, text) {
if (opt.trim) text = text.trim();
if (opt.normalize) text = text.replace(/\s+/g, " ");
return text;
}
function error (parser, er) {
closeText(parser);
er += "\nLine: "+parser.line+
"\nColumn: "+parser.column+
"\nChar: "+parser.c;
er = new Error(er);
parser.error = er;
emit(parser, "onerror", er);
return parser;
}
function end (parser) {
if (parser.state !== S.TEXT) error(parser, "Unexpected end");
closeText(parser);
parser.c = "";
parser.closed = true;
emit(parser, "onend");
SAXParser.call(parser, parser.strict, parser.opt);
return parser;
}
function strictFail (parser, message) {
if (parser.strict) error(parser, message);
}
function newTag (parser) {
if (!parser.strict) parser.tagName = parser.tagName[parser.tagCase]();
parser.tag = { name : parser.tagName, attributes : {} };
}
function openTag (parser) {
parser.sawRoot = true;
parser.tags.push(parser.tag);
emitNode(parser, "onopentag", parser.tag);
parser.tag = null;
parser.tagName = parser.attribName = parser.attribValue = "";
parser.state = S.TEXT;
}
function closeTag (parser) {
if (!parser.tagName) {
strictFail(parser, "Weird empty close tag.");
parser.textNode += "</>";
parser.state = S.TEXT;
return;
}
do {
if (!parser.strict) parser.tagName = parser.tagName[parser.tagCase]();
var closeTo = parser.tagName, close = parser.tags.pop();
if (!close) {
throw "wtf "+parser.tagName+" "+parser.tags+" "+parser.line+ " "+parser.position;
}
if (closeTo !== close.name) strictFail(parser, "Unexpected close tag.");
parser.tag = close;
parser.tagName = close.name;
emitNode(parser, "onclosetag", parser.tagName);
} while (closeTo !== close.name);
if (parser.tags.length === 0) parser.closedRoot = true;
parser.tagName = parser.attribValue = parser.attribName = "";
parser.tag = null;
parser.state = S.TEXT;
}
function parseEntity (parser) {
var entity = parser.entity.toLowerCase(), num, numStr = "";
if (parser.ENTITIES[entity]) return parser.ENTITIES[entity];
if (entity.charAt(0) === "#") {
if (entity.charAt(1) === "x") {
entity = entity.slice(2);
num = parseInt(entity, 16), numStr = num.toString(16);
} else {
entity = entity.slice(1);
num = parseInt(entity, 10), numStr = num.toString(10);
}
}
if (numStr.toLowerCase() !== entity) {
strictFail(parser, "Invalid character entity");
return "&"+parser.entity + ";";
}
return String.fromCharCode(num);
}
function write (chunk) {
var parser = this;
if (this.error) throw this.error;
if (parser.closed) return error(parser,
"Cannot write after close. Assign an onready handler.");
if (chunk === null) return end(parser);
var i = 0, c = ""
while (parser.c = c = chunk.charAt(i++)) {
parser.position ++;
if (c === "\n") {
parser.line ++;
parser.column = 0;
} else parser.column ++;
switch (parser.state) {
case S.BEGIN:
if (c === "<") parser.state = S.OPEN_WAKA;
else if (not(whitespace,c)) {
// have to process this as a text node.
// weird, but happens.
strictFail(parser, "Non-whitespace before first tag.");
parser.textNode = c;
state = S.TEXT;
}
continue;
case S.TEXT:
if (c === "<") parser.state = S.OPEN_WAKA;
else {
if (not(whitespace, c) && (!parser.sawRoot || parser.closedRoot))
strictFail("Text data outside of root node.");
if (c === "&") parser.state = S.TEXT_ENTITY;
else parser.textNode += c;
}
continue;
case S.OPEN_WAKA:
// either a /, ?, !, or text is coming next.
if (c === "!") {
parser.state = S.SGML_DECL;
parser.sgmlDecl = "";
} else if (is(whitespace, c)) {
// wait for it...
} else if (is(nameStart,c)) {
parser.state = S.OPEN_TAG;
parser.tagName = c;
} else if (c === "/") {
parser.state = S.CLOSE_TAG;
parser.tagName = "";
} else if (c === "?") {
parser.state = S.PROC_INST;
parser.procInstName = parser.procInstBody = "";
} else {
strictFail(parser, "Unencoded <");
parser.textNode += "<" + c;
parser.state = S.TEXT;
}
continue;
case S.SGML_DECL:
if ((parser.sgmlDecl+c).toUpperCase() === CDATA) {
parser.state = S.CDATA;
parser.sgmlDecl = "";
parser.cdata = "";
} else if (parser.sgmlDecl+c === "--") {
parser.state = S.COMMENT;
parser.comment = "";
parser.sgmlDecl = "";
} else if ((parser.sgmlDecl+c).toUpperCase() === DOCTYPE) {
parser.state = S.DOCTYPE;
if (parser.doctype || parser.sawRoot) strictFail(parser,
"Inappropriately located doctype declaration");
parser.doctype = "";
parser.sgmlDecl = "";
} else if (c === ">") {
emitNode(parser, "onsgmldeclaration", parser.sgmlDecl);
parser.sgmlDecl = "";
parser.state = S.TEXT;
} else if (is(quote, c)) {
parser.state = S.SGML_DECL_QUOTED;
parser.sgmlDecl += c;
} else parser.sgmlDecl += c;
continue;
case S.SGML_DECL_QUOTED:
if (c === parser.q) {
parser.state = S.SGML_DECL;
parser.q = "";
}
parser.sgmlDecl += c;
continue;
case S.DOCTYPE:
if (c === ">") {
parser.state = S.TEXT;
emitNode(parser, "ondoctype", parser.doctype);
parser.doctype = true; // just remember that we saw it.
} else {
parser.doctype += c;
if (c === "[") parser.state = S.DOCTYPE_DTD;
else if (is(quote, c)) {
parser.state = S.DOCTYPE_QUOTED;
parser.q = c;
}
}
continue;
case S.DOCTYPE_QUOTED:
parser.doctype += c;
if (c === parser.q) {
parser.q = "";
parser.state = S.DOCTYPE;
}
continue;
case S.DOCTYPE_DTD:
parser.doctype += c;
if (c === "]") parser.state = S.DOCTYPE;
else if (is(quote,c)) {
parser.state = S.DOCTYPE_DTD_QUOTED;
parser.q = c;
}
continue;
case S.DOCTYPE_DTD_QUOTED:
parser.doctype += c;
if (c === parser.q) {
parser.state = S.DOCTYPE_DTD;
parser.q = "";
}
continue;
case S.COMMENT:
if (c === "-") parser.state = S.COMMENT_ENDING;
else parser.comment += c;
continue;
case S.COMMENT_ENDING:
if (c === "-") {
parser.state = S.COMMENT_ENDED;
parser.comment = textopts(parser.opt, parser.comment);
if (parser.comment) emitNode(parser, "oncomment", parser.comment);
parser.comment = "";
} else {
strictFail(parser, "Invalid comment");
parser.comment += "-" + c;
}
continue;
case S.COMMENT_ENDED:
if (c !== ">") strictFail(parser, "Malformed comment");
else parser.state = S.TEXT;
continue;
case S.CDATA:
if (c === "]") parser.state = S.CDATA_ENDING;
else parser.cdata += c;
continue;
case S.CDATA_ENDING:
if (c === "]") parser.state = S.CDATA_ENDING_2;
else {
parser.cdata += "]" + c;
parser.state = S.CDATA;
}
continue;
case S.CDATA_ENDING_2:
if (c === ">") {
emitNode(parser, "oncdata", parser.cdata);
parser.cdata = "";
parser.state = S.TEXT;
} else {
parser.cdata += "]]" + c;
parser.state = S.CDATA;
}
continue;
case S.PROC_INST:
if (c === "?") parser.state = S.PROC_INST_ENDING;
else if (is(whitespace, c)) parser.state = S.PROC_INST_BODY;
else parser.procInstName += c;
continue;
case S.PROC_INST_BODY:
if (!parser.procInstBody && is(whitespace, c)) continue;
else if (c === "?") parser.state = S.PROC_INST_ENDING;
else if (is(quote, c)) {
parser.state = S.PROC_INST_QUOTED;
parser.q = c;
parser.procInstBody += c;
} else parser.procInstBody += c;
continue;
case S.PROC_INST_ENDING:
if (c === ">") {
emitNode(parser, "onprocessinginstruction", {
name : parser.procInstName,
body : parser.procInstBody
});
parser.procInstName = parser.procInstBody = "";
parser.state = S.TEXT;
} else {
parser.procInstBody += "?" + c;
parser.state = S.PROC_INST_BODY;
}
continue;
case S.PROC_INST_QUOTED:
parser.procInstBody += c;
if (c === parser.q) {
parser.state = S.PROC_INST_BODY;
parser.q = "";
}
continue;
case S.OPEN_TAG:
if (is(nameBody, c)) parser.tagName += c;
else {
newTag(parser);
if (c === ">") openTag(parser);
else if (c === "/") parser.state = S.OPEN_TAG_SLASH;
else {
if (not(whitespace, c)) strictFail(
parser, "Invalid character in tag name");
parser.state = S.ATTRIB;
}
}
continue;
case S.OPEN_TAG_SLASH:
if (c === ">") {
openTag(parser);
closeTag(parser);
} else {
strictFail(parser, "Forward-slash in opening tag not followed by >");
parser.state = S.ATTRIB;
}
continue;
case S.ATTRIB:
// haven't read the attribute name yet.
if (is(whitespace, c)) continue;
else if (c === ">") openTag(parser);
else if (is(nameStart, c)) {
parser.attribName = c;
parser.attribValue = "";
parser.state = S.ATTRIB_NAME;
} else strictFail(parser, "Invalid attribute name");
continue;
case S.ATTRIB_NAME:
if (c === "=") parser.state = S.ATTRIB_VALUE;
else if (is(whitespace, c)) parser.state = S.ATTRIB_NAME_SAW_WHITE;
else if (is(nameBody, c)) parser.attribName += c;
else strictFail(parser, "Invalid attribute name");
continue;
case S.ATTRIB_NAME_SAW_WHITE:
if (c === "=") parser.state = S.ATTRIB_VALUE;
else if (is(whitespace, c)) continue;
else {
strictFail(parser, "Attribute without value");
parser.tag.attributes[parser.attribName] = "";
parser.attribValue = "";
emitNode(parser, "onattribute", { name : parser.attribName, value : "" });
parser.attribName = "";
if (c === ">") openTag(parser);
else if (is(nameStart, c)) {
parser.attribName = c;
parser.state = S.ATTRIB_NAME;
} else {
strictFail(parser, "Invalid attribute name");
parser.state = S.ATTRIB;
}
}
continue;
case S.ATTRIB_VALUE:
if (is(quote, c)) {
parser.q = c;
parser.state = S.ATTRIB_VALUE_QUOTED;
} else {
strictFail(parser, "Unquoted attribute value");
parser.state = S.ATTRIB_VALUE_UNQUOTED;
parser.attribValue = c;
}
continue;
case S.ATTRIB_VALUE_QUOTED:
if (c !== parser.q) {
if (c === "&") parser.state = S.ATTRIB_VALUE_ENTITY_Q;
else parser.attribValue += c;
continue;
}
parser.tag.attributes[parser.attribName] = parser.attribValue;
emitNode(parser, "onattribute", {
name:parser.attribName, value:parser.attribValue});
parser.attribName = parser.attribValue = "";
parser.q = "";
parser.state = S.ATTRIB;
continue;
case S.ATTRIB_VALUE_UNQUOTED:
if (not(whitespace+">",c)) {
if (c === "&") parser.state = S.ATTRIB_VALUE_ENTITY_U;
else parser.attribValue += c;
continue;
}
emitNode(parser, "onattribute", {
name:parser.attribName, value:parser.attribValue});
parser.attribName = parser.attribValue = "";
if (c === ">") openTag(parser);
else parser.state = S.ATTRIB;
continue;
case S.CLOSE_TAG:
if (!parser.tagName) {
if (is(whitespace, c)) continue;
else if (not(nameStart, c)) strictFail(parser,
"Invalid tagname in closing tag.");
else parser.tagName = c;
}
else if (c === ">") closeTag(parser);
else if (is(nameBody, c)) parser.tagName += c;
else {
if (not(whitespace, c)) strictFail(parser,
"Invalid tagname in closing tag");
parser.state = S.CLOSE_TAG_SAW_WHITE;
}
continue;
case S.CLOSE_TAG_SAW_WHITE:
if (is(whitespace, c)) continue;
if (c === ">") closeTag(parser);
else strictFail("Invalid characters in closing tag");
continue;
case S.TEXT_ENTITY:
case S.ATTRIB_VALUE_ENTITY_Q:
case S.ATTRIB_VALUE_ENTITY_U:
switch(parser.state) {
case S.TEXT_ENTITY:
var returnState = S.TEXT, buffer = "textNode";
break;
case S.ATTRIB_VALUE_ENTITY_Q:
var returnState = S.ATTRIB_VALUE_QUOTED, buffer = "attribValue";
break;
case S.ATTRIB_VALUE_ENTITY_U:
var returnState = S.ATTRIB_VALUE_UNQUOTED, buffer = "attribValue";
break;
}
if (c === ";") {
parser[buffer] += parseEntity(parser);
parser.entity = "";
parser.state = returnState;
}
else if (is(entity, c)) parser.entity += c;
else {
strictFail("Invalid character entity");
parser[buffer] += "&" + parser.entity;
parser.entity = "";
parser.state = returnState;
}
continue;
default:
throw "Unknown state: " + parser.state;
break;
}
}
return parser;
}