From 21df9b504dd3222ee03287f1be52d70f754ae7d3 Mon Sep 17 00:00:00 2001 From: Louis-Dominique Dubeau Date: Mon, 10 Jun 2019 12:02:38 -0400 Subject: [PATCH] perf: improve the check for ]]> in character data XML disallows the sequence of characters ]]> in character data. The previous way in which we checked for the presence of ]]> was rather expensive. (It probably triggered repeated flattenings of the `this.text` string.) The code was reworked to dramatically reduce the cost of that check. --- lib/saxes.js | 49 +- test/entities.js | 12 + test/files/entities.xml | 31347 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 31388 insertions(+), 20 deletions(-) create mode 100644 test/files/entities.xml diff --git a/lib/saxes.js b/lib/saxes.js index 95b23f1b..3cf53a9d 100644 --- a/lib/saxes.js +++ b/lib/saxes.js @@ -104,7 +104,6 @@ function isQuote(c) { const QUOTES = [DQUOTE, SQUOTE]; -const TEXT_TERMINATOR = [LESS, AMP]; const DOCTYPE_TERMINATOR = [...QUOTES, OPEN_BRACKET, GREATER]; const DOCTYPE_DTD_TERMINATOR = [...QUOTES, CLOSE_BRACKET]; const XML_DECL_NAME_TERMINATOR = [EQUAL, QUESTION, ...S_LIST]; @@ -333,10 +332,6 @@ class SaxesParser { this.requiredSeparator = undefined; this.entityReturnState = undefined; this.badEntityName = false; - // This records the index before which we don't have to check for the - // presence of ]]]>. The text before that index has been checked already, - // and should not be checked twice. - this.textCheckedBefore = 0; const xmlnsOpt = this.xmlnsOpt = !!this.opt.xmlns; if (xmlnsOpt) { @@ -786,7 +781,6 @@ class SaxesParser { this.reportedTextBeforeRoot = true; } this.text = String.fromCodePoint(c); - this.textCheckedBefore = 0; this.state = S_TEXT; this.xmlDeclPossible = false; } @@ -794,10 +788,37 @@ class SaxesParser { /** @private */ sText() { - const c = this.captureTo(TEXT_TERMINATOR, "text"); + // This is essentially a specialized version of captureTo which is optimized + // for performing the ]]> check. A previous version of this code, checked + // ``this.text`` for the presence of ]]>. It simplified the code but was + // very costly when character data contained a lot of entities to be parsed. + const { chunk, limit, i: start } = this; + let c; + while (this.i < limit) { + const code = this.getCode(); + if (code === LESS || code === AMP) { + c = code; + break; + } + } + + // This is faster than adding codepoints one by one. + const slice = chunk.substring(start, + c === undefined ? undefined : + (this.i - (c <= 0xFFFF ? 1 : 2))); + + // We test for the presence of ]]>, which is not allowed in CharData. We + // have to take into account edge conditions. + if (slice.includes("]]>") || + (slice[0] === ">" && this.text.endsWith("]]")) || + (slice.startsWith("]>") && this.text.endsWith("]"))) { + this.fail("the string \"]]>\" is disallowed in char data."); + } + + this.text += slice; if ((!this.sawRoot || this.closedRoot) && - (/\S/.test(this.text) || c === AMP)) { + (/\S/.test(slice) || c === AMP)) { // We use the reportedTextBeforeRoot and reportedTextAfterRoot flags // to avoid reporting errors for every single character that is out of // place. @@ -812,15 +833,6 @@ class SaxesParser { } } - if (this.text.includes("]]>", this.textCheckedBefore)) { - this.fail("the string \"]]>\" is disallowed in char data."); - } - - // We have to go back two spaces so that we can catch the case where on a - // previous write call, the text buffer ended on ``]]`` and we started - // with ``>`` this time around. - this.textCheckedBefore = this.text.length - 2; - switch (c) { case LESS: this.state = S_OPEN_WAKA; @@ -1568,7 +1580,6 @@ class SaxesParser { else { this.text += this.parseEntity(this.entity); } - this.textCheckedBefore = this.text.length; this.entity = ""; this.state = this.entityReturnState; this.badEntityName = false; @@ -1576,7 +1587,6 @@ class SaxesParser { else if (c) { this.fail("disallowed character in entity name."); this.text += `&${this.entity}${String.fromCodePoint(c)}`; - this.textCheckedBefore = this.text.length; this.entity = ""; this.state = this.entityReturnState; this.badEntityName = false; @@ -1623,7 +1633,6 @@ class SaxesParser { closeText() { this.ontext(this.text); this.text = ""; - this.textCheckedBefore = 0; } /** diff --git a/test/entities.js b/test/entities.js index c29481e1..92b5a522 100644 --- a/test/entities.js +++ b/test/entities.js @@ -1,5 +1,10 @@ "use strict"; +const { execFile: _execFile } = require("child_process"); +const util = require("util"); + +const execFile = util.promisify(_execFile); + require(".").test({ name: "entities", xml: "& < > >", @@ -10,3 +15,10 @@ require(".").test({ ["closetag", { name: "r", attributes: {}, isSelfClosing: false }], ], }); + +// This test mainly exists to check parsing speed of a file with a lot of +// entities. +it("mass entities", async () => { + await execFile("node", ["./examples/null-parser.js", + "test/files/entities.xml"]); +}); diff --git a/test/files/entities.xml b/test/files/entities.xml new file mode 100644 index 00000000..f6064d61 --- /dev/null +++ b/test/files/entities.xml @@ -0,0 +1,31347 @@ + + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < > " " + < 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