mirror of
https://github.com/phpv8/v8js.git
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340 lines
10 KiB
JavaScript
340 lines
10 KiB
JavaScript
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/*
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Copyright 2008, mark turansky (www.markturansky.com)
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Copyright 2010, Andrew Kelley (superjoesoftware.com)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is furnished
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to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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The Software shall be used for Good, not Evil.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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(This is the license from www.json.org and I think it's awesome)
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*/
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String.prototype.endsWith = function endsWith(c) {
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if (this.charAt(this.length - 1) == c) {
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return true;
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} else {
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return false;
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}
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};
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String.prototype.startsWith = function startsWith(c) {
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if (this.charAt(0) == c) {
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return true;
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} else {
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return false;
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}
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};
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RegExp.quote = function(str) {
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return str.replace(/([.?*+\^$\[\]\\(){}\-])/g, "\\$1");
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};
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String.prototype.replaceAll = function replaceAll(a, b) {
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return this.replace(new RegExp(RegExp.quote(a), 'g'), b);
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};
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var Jst = function () {
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// private variables:
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var that; // reference to the public object
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// all write and writeln functions eval'd by Jst
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// concatenate to this internal variable
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var html = "";
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// private functions
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function CharacterStack(str) {
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var i;
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this.characters = [];
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this.peek = function peek() {
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return this.characters[this.characters.length - 1];
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};
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this.pop = function pop() {
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return this.characters.pop();
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};
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this.push = function push(c) {
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this.characters.push(c);
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};
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this.hasMore = function hasMore() {
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if (this.characters.length > 0) {
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return true;
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} else {
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return false;
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}
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};
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for (i = str.length; i >= 0; i -= 1) {
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this.characters.push(str.charAt(i));
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}
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}
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function StringWriter() {
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this.str = "";
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this.write = function write(s) {
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this.str += s;
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};
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this.toString = function toString() {
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return this.str;
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};
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}
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function parseScriptlet(stack) {
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var fragment = new StringWriter();
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var c; // character
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while (stack.hasMore()) {
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if (stack.peek() == '%') { //possible end delimiter
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c = stack.pop();
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if (stack.peek() == '>') { //end delimiter
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// pop > so that it is not available to main parse loop
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stack.pop();
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if (stack.peek() == '\n') {
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fragment.write(stack.pop());
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}
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break;
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} else {
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fragment.write(c);
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}
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} else {
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fragment.write(stack.pop());
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}
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}
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return fragment.toString();
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}
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function isOpeningDelimiter(c) {
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if (c == "<" || c == "%lt;") {
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return true;
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} else {
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return false;
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}
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}
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function isClosingDelimiter(c) {
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if (c == ">" || c == "%gt;") {
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return true;
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} else {
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return false;
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}
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}
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function appendExpressionFragment(writer, fragment, jstWriter) {
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var i,j;
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var c;
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// check to be sure quotes are on both ends of a string literal
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if (fragment.startsWith("\"") && !fragment.endsWith("\"")) {
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//some scriptlets end with \n, especially if the script ends the file
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if (fragment.endsWith("\n") && fragment.charAt(fragment.length - 2) == '"') {
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//we're ok...
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} else {
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throw { "message":"'" + fragment + "' is not properly quoted"};
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}
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}
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if (!fragment.startsWith("\"") && fragment.endsWith("\"")) {
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throw { "message":"'" + fragment + "' is not properly quoted"};
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}
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// print or println?
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if (fragment.endsWith("\n")) {
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writer.write(jstWriter + "ln(");
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//strip the newline
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fragment = fragment.substring(0, fragment.length - 1);
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} else {
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writer.write(jstWriter + "(");
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}
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if (fragment.startsWith("\"") && fragment.endsWith("\"")) {
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//strip the quotes
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fragment = fragment.substring(1, fragment.length - 1);
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writer.write("\"");
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for (i = 0; i < fragment.length; i += 1) {
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c = fragment.charAt(i);
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if (c == '"') {
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writer.write("\\");
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writer.write(c);
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}
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}
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writer.write("\"");
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} else {
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for (j = 0; j < fragment.length; j += 1) {
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writer.write(fragment.charAt(j));
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}
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}
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writer.write(");");
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}
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function appendTextFragment(writer, fragment) {
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var i;
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var c;
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if (fragment.endsWith("\n")) {
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writer.write("writeln(\"");
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} else {
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writer.write("write(\"");
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}
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for (i = 0; i < fragment.length; i += 1) {
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c = fragment.charAt(i);
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if (c == '"') {
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writer.write("\\");
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}
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// we took care of the line break with print vs. println
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if (c != '\n' && c != '\r') {
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writer.write(c);
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}
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}
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writer.write("\");");
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}
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function parseExpression(stack) {
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var fragment = new StringWriter();
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var c;
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while (stack.hasMore()) {
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if (stack.peek() == '%') { //possible end delimiter
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c = stack.pop();
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if (isClosingDelimiter(stack.peek())) { //end delimiter
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//pop > so that it is not available to main parse loop
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stack.pop();
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if (stack.peek() == '\n') {
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fragment.write(stack.pop());
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}
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break;
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} else {
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fragment.write("%");
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}
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} else {
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fragment.write(stack.pop());
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}
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}
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return fragment.toString();
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}
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function parseText(stack) {
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var fragment = new StringWriter();
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var c,d;
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while (stack.hasMore()) {
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if (isOpeningDelimiter(stack.peek())) { //possible delimiter
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c = stack.pop();
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if (stack.peek() == '%') { // delimiter!
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// push c onto the stack to be used in main parse loop
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stack.push(c);
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break;
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} else {
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fragment.write(c);
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}
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} else {
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d = stack.pop();
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fragment.write(d);
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if (d == '\n') { //done with this fragment. println it.
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break;
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}
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}
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}
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return fragment.toString();
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}
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function safeWrite(s) {
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s = s.toString();
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s = s.replaceAll('&', '&');
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s = s.replaceAll('"', '"');
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s = s.replaceAll('<', '<');
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s = s.replaceAll('>', '>');
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html += s;
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}
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function safeWriteln(s) {
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safeWrite(s + "\n");
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}
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function write(s) {
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html += s;
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}
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function writeln(s) {
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write(s + "\n");
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}
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that = {
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// public methods:
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// pre-compile a template for quicker rendering. save the return value and
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// pass it to evaluate.
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compile: function (src) {
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var stack = new CharacterStack(src);
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var writer = new StringWriter();
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var c;
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var fragment;
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while (stack.hasMore()) {
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if (isOpeningDelimiter(stack.peek())) { //possible delimiter
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c = stack.pop();
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if (stack.peek() == '%') { //delimiter!
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c = stack.pop();
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if (stack.peek() == "=") {
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// expression, escape all html
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stack.pop();
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fragment = parseExpression(stack);
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appendExpressionFragment(writer, fragment,
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"safeWrite");
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} else if (stack.peek() == "+") {
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// expression, don't escape html
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stack.pop();
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fragment = parseExpression(stack);
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appendExpressionFragment(writer, fragment,
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"write");
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} else {
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fragment = parseScriptlet(stack);
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writer.write(fragment);
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}
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} else { //not a delimiter
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stack.push(c);
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fragment = parseText(stack);
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appendTextFragment(writer, fragment);
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}
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} else {
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fragment = parseText(stack);
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appendTextFragment(writer, fragment);
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}
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}
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return writer.toString();
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},
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// evaluate a pre-compiled script. recommended approach
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evaluate: function (script, args) {
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with(args) {
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html = "";
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eval(script);
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return html;
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}
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},
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// if you're lazy, you can use this
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evaluateSingleShot: function (src, args) {
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return this.evaluate(this.compile(src), args);
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}
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};
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return that;
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}();
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