S2OJ/web/js/codemirror/addon/hint/sql-hint.js

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2016-07-18 16:39:37 +00:00
// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE
(function(mod) {
if (typeof exports == "object" && typeof module == "object") // CommonJS
mod(require("../../lib/codemirror"), require("../../mode/sql/sql"));
else if (typeof define == "function" && define.amd) // AMD
define(["../../lib/codemirror", "../../mode/sql/sql"], mod);
else // Plain browser env
mod(CodeMirror);
})(function(CodeMirror) {
"use strict";
var tables;
var keywords;
var CONS = {
QUERY_DIV: ";",
ALIAS_KEYWORD: "AS"
};
var Pos = CodeMirror.Pos;
function getKeywords(editor) {
var mode = editor.doc.modeOption;
if (mode === "sql") mode = "text/x-sql";
return CodeMirror.resolveMode(mode).keywords;
}
function match(string, word) {
var len = string.length;
var sub = word.substr(0, len);
return string.toUpperCase() === sub.toUpperCase();
}
function addMatches(result, search, wordlist, formatter) {
for (var word in wordlist) {
if (!wordlist.hasOwnProperty(word)) continue;
if (Array.isArray(wordlist)) {
word = wordlist[word];
}
if (match(search, word)) {
result.push(formatter(word));
}
}
}
function columnCompletion(result, editor) {
var cur = editor.getCursor();
var token = editor.getTokenAt(cur);
var string = token.string.substr(1);
var prevCur = Pos(cur.line, token.start);
var table = editor.getTokenAt(prevCur).string;
if (!tables.hasOwnProperty(table))
table = findTableByAlias(table, editor);
var columns = tables[table];
if (!columns) return;
addMatches(result, string, columns, function(w) {return "." + w;});
}
function eachWord(lineText, f) {
if (!lineText) return;
var excepted = /[,;]/g;
var words = lineText.split(" ");
for (var i = 0; i < words.length; i++) {
f(words[i]?words[i].replace(excepted, '') : '');
}
}
function convertCurToNumber(cur) {
// max characters of a line is 999,999.
return cur.line + cur.ch / Math.pow(10, 6);
}
function convertNumberToCur(num) {
return Pos(Math.floor(num), +num.toString().split('.').pop());
}
function findTableByAlias(alias, editor) {
var doc = editor.doc;
var fullQuery = doc.getValue();
var aliasUpperCase = alias.toUpperCase();
var previousWord = "";
var table = "";
var separator = [];
var validRange = {
start: Pos(0, 0),
end: Pos(editor.lastLine(), editor.getLineHandle(editor.lastLine()).length)
};
//add separator
var indexOfSeparator = fullQuery.indexOf(CONS.QUERY_DIV);
while(indexOfSeparator != -1) {
separator.push(doc.posFromIndex(indexOfSeparator));
indexOfSeparator = fullQuery.indexOf(CONS.QUERY_DIV, indexOfSeparator+1);
}
separator.unshift(Pos(0, 0));
separator.push(Pos(editor.lastLine(), editor.getLineHandle(editor.lastLine()).text.length));
//find valid range
var prevItem = 0;
var current = convertCurToNumber(editor.getCursor());
for (var i=0; i< separator.length; i++) {
var _v = convertCurToNumber(separator[i]);
if (current > prevItem && current <= _v) {
validRange = { start: convertNumberToCur(prevItem), end: convertNumberToCur(_v) };
break;
}
prevItem = _v;
}
var query = doc.getRange(validRange.start, validRange.end, false);
for (var i = 0; i < query.length; i++) {
var lineText = query[i];
eachWord(lineText, function(word) {
var wordUpperCase = word.toUpperCase();
if (wordUpperCase === aliasUpperCase && tables.hasOwnProperty(previousWord)) {
table = previousWord;
}
if (wordUpperCase !== CONS.ALIAS_KEYWORD) {
previousWord = word;
}
});
if (table) break;
}
return table;
}
CodeMirror.registerHelper("hint", "sql", function(editor, options) {
tables = (options && options.tables) || {};
keywords = keywords || getKeywords(editor);
var cur = editor.getCursor();
var result = [];
var token = editor.getTokenAt(cur), start, end, search;
if (token.string.match(/^[.\w@]\w*$/)) {
search = token.string;
start = token.start;
end = token.end;
} else {
start = end = cur.ch;
search = "";
}
if (search.charAt(0) == ".") {
columnCompletion(result, editor);
if (!result.length) {
while (start && search.charAt(0) == ".") {
token = editor.getTokenAt(Pos(cur.line, token.start - 1));
start = token.start;
search = token.string + search;
}
addMatches(result, search, tables, function(w) {return w;});
}
} else {
addMatches(result, search, tables, function(w) {return w;});
addMatches(result, search, keywords, function(w) {return w.toUpperCase();});
}
return {list: result, from: Pos(cur.line, start), to: Pos(cur.line, end)};
});
});