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280 lines
8.7 KiB
280 lines
8.7 KiB
11 years ago
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/*! Copyright (c) 2011, Lloyd Hilaiel, ISC License */
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/*
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* This is the JSONSelect reference implementation, in javascript.
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*/
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(function(exports) {
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var // localize references
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toString = Object.prototype.toString;
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function jsonParse(str) {
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try {
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if(JSON && JSON.parse){
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return JSON.parse(str);
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}
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return (new Function("return " + str))();
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} catch(e) {
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te("ijs");
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}
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}
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// emitted error codes.
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var errorCodes = {
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"ijs": "invalid json string",
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"mpc": "multiple pseudo classes (:xxx) not allowed",
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"mepf": "malformed expression in pseudo-function",
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"nmi": "multiple ids not allowed",
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"se": "selector expected",
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"sra": "string required after '.'",
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"uc": "unrecognized char",
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"ujs": "unclosed json string",
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"upc": "unrecognized pseudo class"
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};
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// throw an error message
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function te(ec) {
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throw new Error(errorCodes[ec]);
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}
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// THE LEXER
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var toks = {
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psc: 1, // pseudo class
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psf: 2, // pseudo class function
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typ: 3, // type
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str: 4 // string
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};
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var pat = /^(?:([\r\n\t\ ]+)|([*.,>])|(string|boolean|null|array|object|number)|(:(?:root|first-child|last-child|only-child))|(:(?:nth-child|nth-last-child))|(:\w+)|(\"(?:[^\\]|\\[^\"])*\")|(\")|((?:[_a-zA-Z]|[^\0-\0177]|\\[^\r\n\f0-9a-fA-F])(?:[_a-zA-Z0-9\-]|[^\u0000-\u0177]|(?:\\[^\r\n\f0-9a-fA-F]))*))/;
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var exprPat = /^\s*\(\s*(?:([+\-]?)([0-9]*)n\s*(?:([+\-])\s*([0-9]))?|(odd|even)|([+\-]?[0-9]+))\s*\)/;
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var lex = function (str, off) {
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if (!off) off = 0;
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var m = pat.exec(str.substr(off));
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if (!m) return undefined;
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off+=m[0].length;
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var a;
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if (m[1]) a = [off, " "];
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else if (m[2]) a = [off, m[0]];
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else if (m[3]) a = [off, toks.typ, m[0]];
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else if (m[4]) a = [off, toks.psc, m[0]];
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else if (m[5]) a = [off, toks.psf, m[0]];
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else if (m[6]) te("upc");
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else if (m[7]) a = [off, toks.str, jsonParse(m[0])];
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else if (m[8]) te("ujs");
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else if (m[9]) a = [off, toks.str, m[0].replace(/\\([^\r\n\f0-9a-fA-F])/g,"$1")];
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return a;
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};
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// THE PARSER
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var parse = function (str) {
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var a = [], off = 0, am;
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while (true) {
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var s = parse_selector(str, off);
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a.push(s[1]);
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s = lex(str, off = s[0]);
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if (s && s[1] === " ") s = lex(str, off = s[0]);
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if (!s) break;
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// now we've parsed a selector, and have something else...
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if (s[1] === ">") {
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a.push(">");
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off = s[0];
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} else if (s[1] === ",") {
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if (am === undefined) am = [ ",", a ];
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else am.push(a);
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a = [];
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off = s[0];
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}
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}
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if (am) am.push(a);
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return am ? am : a;
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};
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var parse_selector = function(str, off) {
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var soff = off;
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var s = { };
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var l = lex(str, off);
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// skip space
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if (l && l[1] === " ") { soff = off = l[0]; l = lex(str, off); }
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if (l && l[1] === toks.typ) {
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s.type = l[2];
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l = lex(str, (off = l[0]));
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} else if (l && l[1] === "*") {
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// don't bother representing the universal sel, '*' in the
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// parse tree, cause it's the default
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l = lex(str, (off = l[0]));
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}
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// now support either an id or a pc
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while (true) {
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if (l === undefined) {
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break;
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} else if (l[1] === ".") {
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l = lex(str, (off = l[0]));
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if (!l || l[1] !== toks.str) te("sra");
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if (s.id) te("nmi");
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s.id = l[2];
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} else if (l[1] === toks.psc) {
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if (s.pc || s.pf) te("mpc");
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// collapse first-child and last-child into nth-child expressions
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if (l[2] === ":first-child") {
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s.pf = ":nth-child";
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s.a = 0;
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s.b = 1;
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} else if (l[2] === ":last-child") {
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s.pf = ":nth-last-child";
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s.a = 0;
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s.b = 1;
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} else {
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s.pc = l[2];
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}
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} else if (l[1] === toks.psf) {
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if (s.pc || s.pf ) te("mpc");
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s.pf = l[2];
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var m = exprPat.exec(str.substr(l[0]));
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if (!m) te("mepf");
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if (m[5]) {
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s.a = 2;
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s.b = (m[5] === "odd") ? 1 : 0;
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} else if (m[6]) {
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s.a = 0;
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s.b = parseInt(m[6], 10);
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} else {
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s.a = parseInt((m[1] ? m[1] : "+") + (m[2] ? m[2] : "1"),10);
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s.b = m[3] ? parseInt(m[3] + m[4],10) : 0;
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}
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l[0] += m[0].length;
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} else {
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break;
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}
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l = lex(str, (off = l[0]));
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}
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// now if we didn't actually parse anything it's an error
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if (soff === off) te("se");
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return [off, s];
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};
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// THE EVALUATOR
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function isArray(o) {
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return Array.isArray ? Array.isArray(o) :
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toString.call(o) === "[object Array]";
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}
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function mytypeof(o) {
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if (o === null) return "null";
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var to = typeof o;
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if (to === "object" && isArray(o)) to = "array";
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return to;
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}
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function mn(node, sel, id, num, tot) {
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var sels = [];
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var cs = (sel[0] === ">") ? sel[1] : sel[0];
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var m = true, mod;
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if (cs.type) m = m && (cs.type === mytypeof(node));
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if (cs.id) m = m && (cs.id === id);
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if (m && cs.pf) {
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if (cs.pf === ":nth-last-child") num = tot - num;
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else num++;
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if (cs.a === 0) {
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m = cs.b === num;
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} else {
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mod = ((num - cs.b) % cs.a);
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m = (!mod && ((num*cs.a + cs.b) >= 0));
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}
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}
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// should we repeat this selector for descendants?
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if (sel[0] !== ">" && sel[0].pc !== ":root") sels.push(sel);
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if (m) {
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// is there a fragment that we should pass down?
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if (sel[0] === ">") { if (sel.length > 2) { m = false; sels.push(sel.slice(2)); } }
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else if (sel.length > 1) { m = false; sels.push(sel.slice(1)); }
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}
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return [m, sels];
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}
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function forEach(sel, obj, fun, id, num, tot) {
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var a = (sel[0] === ",") ? sel.slice(1) : [sel],
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a0 = [],
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call = false,
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i = 0, j = 0, l = 0, k, x;
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for (i = 0; i < a.length; i++) {
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x = mn(obj, a[i], id, num, tot);
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if (x[0]) {
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call = true;
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}
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for (j = 0; j < x[1].length; j++) {
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a0.push(x[1][j]);
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}
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}
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if (a0.length && typeof obj === "object") {
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if (a0.length >= 1) {
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a0.unshift(",");
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}
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if (isArray(obj)) {
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for (i = 0; i < obj.length; i++) {
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forEach(a0, obj[i], fun, undefined, i, obj.length);
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}
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} else {
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// it's a shame to do this for :last-child and other
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// properties which count from the end when we don't
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// even know if they're present. Also, the stream
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// parser is going to be pissed.
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l = 0;
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for (k in obj) {
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if (obj.hasOwnProperty(k)) {
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l++;
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}
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}
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i = 0;
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for (k in obj) {
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if (obj.hasOwnProperty(k)) {
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forEach(a0, obj[k], fun, k, i++, l);
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}
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}
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}
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}
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if (call && fun) {
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fun(obj);
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}
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}
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function match(sel, obj) {
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var a = [];
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forEach(sel, obj, function(x) {
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a.push(x);
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});
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return a;
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}
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function compile(sel) {
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return {
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sel: parse(sel),
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match: function(obj){
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return match(this.sel, obj);
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},
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forEach: function(obj, fun) {
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return forEach(this.sel, obj, fun);
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}
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};
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}
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exports._lex = lex;
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exports._parse = parse;
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exports.match = function (sel, obj) {
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return compile(sel).match(obj);
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};
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exports.forEach = function(sel, obj, fun) {
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return compile(sel).forEach(obj, fun);
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};
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exports.compile = compile;
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})(typeof exports === "undefined" ? (window.JSONSelect = {}) : exports);
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