mirror of
https://github.com/ChronosX88/psyced.git
synced 2024-11-14 06:21:02 +00:00
606 lines
12 KiB
Plaintext
606 lines
12 KiB
Plaintext
// vim:syntax=lpc
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// $Id: jsonparser.pike,v 1.5 2008/08/05 12:21:34 lynx Exp $
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//
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// I really hate those comments.
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//
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// Copyright History:
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// 1. Public Domain 2002 JSON.org
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// 2. Ported to C# by Are Bjolseth, teleplan.no
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// 3. Ported to pike by Bill Welliver
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// "Last night, I downloaded the JSON-C# code, and converted it to pike
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// (with relatively little effort, it was mostly a tedious reformatting
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// job)."
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// 4. Adopted by Tobias 'tobij' Josefowitz, now uses Pike datastructures,
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// and can only be run in LDMud.
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//
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// As far as I am concerned, this still is Public Domain.
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// I will probably once find out whether Are and Bill think the same wwy
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// about it.
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#ifdef __PIKE__
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/// <summary>
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/// <para>
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/// A JSONTokener takes a source string and extracts characters and tokens from
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/// it. It is used by the JSONObject and JSONArray constructors to parse
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/// JSON source strings.
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/// </para>
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/// <para>
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/// Public Domain 2002 JSON.org
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/// @author JSON.org
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/// @version 0.1
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/// </para>
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/// <para>Ported to C# by Are Bjolseth, teleplan.no</para>
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/// <para>
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/// <list type="bullet">
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/// <item><description>Implement Custom exceptions</description></item>
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/// <item><description>Add unit testing</description></item>
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/// <item><description>Add log4net</description></item>
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/// </list>
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/// </para>
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/// </summary>
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/// <summary>The index of the next character.</summary>
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int myIndex;
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/// <summary>The source string being tokenized.</summary>
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string mySource;
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# define PROTECTED public
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# define THROW(x) throw(Error.Generic(x))
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# define SBGET(x) (x)->get()
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# define int2char(x) String.int2char(x)
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# define trim_whites(x) String.trim_whites(x)
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program objectbuilder, arraybuilder;
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#else
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# define PROTECTED protected
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PROTECTED int myIndex;
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PROTECTED string mySource;
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# define arrayp(x) pointerp(x)
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# define THROW(x) raise_error(x)
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# define UNDEFINED 0
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# define SBGET(x) (x)
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# define int2char(x) _int2char(x)
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# define trim_whites(x) trim(x)
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# define search strstr
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PROTECTED mixed nextObject();
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PROTECTED string _int2char(int c) {
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string s = " ";
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s[0] = c;
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return s;
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}
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#endif
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/// <summary>
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/// Construct a JSONTokener from a string.
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/// </summary>
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/// <param name="s">A source string.</param>
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#ifdef __PIKE__
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void create(string s, program|void objectb, program|void arrayb)
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#else
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mixed parse_json(string s)
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#endif
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{
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mySource = s;
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myIndex = 0;
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#ifdef __PIKE__
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objectbuilder = objectb;
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arraybuilder = arrayb;
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#else
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return nextObject();
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#endif
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}
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/// <summary>
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/// Back up one character. This provides a sort of lookahead capability,
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/// so that you can test for a digit or letter before attempting to parse
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/// the next number or identifier.
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/// </summary>
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PROTECTED void back() {
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if (myIndex > 0)
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myIndex -= 1;
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}
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/// <summary>
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/// Determine if the source string still contains characters that next() can consume.
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/// </summary>
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/// <returns>true if not yet at the end of the source.</returns>
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PROTECTED int more() {
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return myIndex < sizeof(mySource);
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}
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/// <summary>
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/// Get the next character in the source string.
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/// </summary>
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/// <returns>The next character, or 0 if past the end of the source string.</returns>
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#ifdef __PIKE__
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PROTECTED int next(int|void x)
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#else
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varargs PROTECTED int next(int x)
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#endif
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{
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if(x) {
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int n = next();
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if (n != x) {
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THROW("Expected '" + x + "' and instead saw '" + n + "'.\n");
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}
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return n;
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} else {
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int c = more() ? mySource[myIndex] : 0;
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myIndex += 1;
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return c;
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}
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}
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/// <summary>
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/// Get the next n characters.
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/// </summary>
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/// <param name="n">The number of characters to take.</param>
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/// <returns>A string of n characters.</returns>
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PROTECTED string nextn(int n) {
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int i = myIndex;
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int j = i + n;
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if (j >= sizeof(mySource)) {
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THROW("Substring bounds error\n");
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}
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myIndex += n;
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return mySource[i..j];
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}
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/// <summary>
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/// Get the next char in the string, skipping whitespace
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/// and comments (slashslash and slashstar).
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/// </summary>
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/// <returns>A character, or 0 if there are no more characters.</returns>
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PROTECTED int nextClean() {
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while (1) {
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int c = next();
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if (c == '/') {
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switch (next()) {
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case '/':
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do {
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c = next();
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} while (c != '\n' && c != '\r' && c != 0);
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break;
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case '*':
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while (1) {
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c = next();
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if (c == 0) {
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THROW("Unclosed comment.\n");
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}
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if (c == '*') {
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if (next() == '/') {
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break;
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}
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back();
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}
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}
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break;
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default:
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back();
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return '/';
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}
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}
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else if (c == 0 || c > ' ') {
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return c;
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}
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}
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#ifndef __PIKE__
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return 0; // will never be reached, stupid LDMud!
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#endif
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}
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/// <summary>
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/// Return the characters up to the next close quote character.
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/// Backslash processing is done. The formal JSON format does not
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/// allow strings in single quotes, but an implementation is allowed to
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/// accept them.
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/// </summary>
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/// <param name="quote">The quoting character, either " or '</param>
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/// <returns>A String.</returns>
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PROTECTED string nextString(int quote) {
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int c;
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#ifdef __PIKE__
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String.Buffer sb = String.Buffer();
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#else
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string sb = "";
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#endif
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while (1) {
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c = next();
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if ((c == 0x00) || (c == 0x0A) || (c == 0x0D)) {
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THROW("Unterminated string.\n");
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}
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// CTRL chars
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if (c == '\\') {
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c = next();
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switch (c) {
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case 'b': //Backspace
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sb+="\b";
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break;
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case 't': //Horizontal tab
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sb+="\t";
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break;
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case 'n': //newline
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sb+="\n";
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break;
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case 'f': //Form feed
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sb+="\f";
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break;
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case 'r': // Carriage return
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sb+="\r";
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break;
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case 'u':
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#ifdef __PIKE__
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int iascii;
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sscanf(nextn(4), "%4x", iascii);
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sb+=int2char(iascii);
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#else
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sb+=int2char(hex2int(nextn(2)));
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sb+=int2char(hex2int(nextn(2)));
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#endif
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break;
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default:
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sb+=int2char(c);
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break;
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}
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} else {
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if (c == quote) {
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#ifdef __PIKE__
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return SBGET(sb);
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#else
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return sb;
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#endif
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}
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sb+=int2char(c);
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}
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}//END-while
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#ifndef __PIKE__
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return ""; // will never be reached. stupid LDMud
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#endif
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}
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/// <summary>
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/// Unescape the source text. Convert %hh sequences to single characters,
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/// and convert plus to space. There are Web transport systems that insist on
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/// doing unnecessary URL encoding. This provides a way to undo it.
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/// </summary>
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/// <summary>
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/// Convert %hh sequences to single characters, and convert plus to space.
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/// </summary>
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/// <param name="s">A string that may contain plus and %hh sequences.</param>
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/// <returns>The unescaped string.</returns>
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#ifdef __PIKE__
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PROTECTED string unescape(string|void s)
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#else
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PROTECTED varargs string unescape(string s)
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#endif
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{
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if(!s) s = mySource;
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int len = sizeof(s);
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#ifdef __PIKE__
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String.Buffer sb = String.Buffer();
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#else
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string sb = "";
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#endif
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for (int i=0; i < len; i++) {
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int c = s[i];
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if (c == '+') {
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c = ' ';
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} else if (c == '%' && (i + 2 < len)) {
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i += 2;
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c = hex2int(s[i-1 .. i]);
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}
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sb+=int2char(c);
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}
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return SBGET(sb);
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}
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#ifdef __PIKE__
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mapping|object jsonObject()
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#else
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mapping jsonObject()
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#endif
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{
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#ifdef __PIKE__
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mixed addTo = objectbuilder ? objectbuilder() : ([ ]);
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#else
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mapping addTo = ([ ]);
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#endif
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if (next() == '%') {
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unescape();
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}
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back();
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if (nextClean() != '{') {
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THROW("A JSONObject must begin with '{'.\n");
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}
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while (1) {
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int c;
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string key;
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mixed obj;
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c = nextClean();
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switch (c) {
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case 0:
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THROW("A JSONObject must end "
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"with '}'.\n");
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case '}':
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#ifdef __PIKE__
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return mappingp(addTo)
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? addTo
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: ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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case '"':
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back();
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// TODO:: error on != " || '
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key = nextObject();
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break;
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default:
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THROW("Non-String as "
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"JSONObject-key. That "
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"is invalid!\n");
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}
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if (nextClean() != ':') {
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PT(("jsonFAIL: '%c' at %O\n", nextClean(), myIndex))
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THROW("Expected a ':' after a key.\n");
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}
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obj = nextObject();
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#ifdef __PIKE__
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if (mappingp(addTo)) {
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([mapping]addTo)[key] = obj;
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} else {
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([object]addTo)->add(key, obj);
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}
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#else
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addTo[key] = obj;
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#endif
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switch (nextClean()) {
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case ',':
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if (nextClean() == '}') {
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#ifdef __PIKE__
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return mappingp(addTo) ? addTo : ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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}
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back();
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break;
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case '}':
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#ifdef __PIKE__
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return mappingp(addTo) ? addTo : ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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default:
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THROW("Expected a ',' or '}'");
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}
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}
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#ifdef __PIKE__
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return mappingp(addTo) ? addTo : ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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}
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#ifdef __PIKE__
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array|object jsonArray()
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#else
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mixed *jsonArray()
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#endif
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{
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#ifdef __PIKE__
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mixed addTo = objectbuilder ? objectbuilder() : ({ });
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#else
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mixed *addTo = ({ });
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#endif
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if (nextClean() != '[') {
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THROW("A JSONArray must start with '['.\n");
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}
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if (nextClean() == ']') {
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#ifdef __PIKE__
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return arrayp(addTo) ? addTo : ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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}
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back();
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while (1) {
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if (arrayp(addTo)) {
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addTo += ({ nextObject() });
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} else {
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addTo->add(nextObject());
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}
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switch (nextClean())
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{
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case ',':
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if (nextClean() == ']') {
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#ifdef __PIKE__
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return arrayp(addTo)
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? addTo
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: ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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}
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back();
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break;
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case ']':
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#ifdef __PIKE__
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return arrayp(addTo)
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? addTo
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: ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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default:
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THROW("Expected a ',' or ']'.\n");
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}
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}
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#ifdef __PIKE__
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return arrayp(addTo) ? addTo : ([object]addTo)->finish();
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#else
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return addTo;
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#endif
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}
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/// <summary>
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/// Get the next value as object. The value can be a Boolean, Double, Integer,
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/// JSONArray, JSONObject, or String, or the JSONObject.NULL object.
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/// </summary>
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/// <returns>An object.</returns>
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PROTECTED mixed nextObject() {
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int c = nextClean();
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string s;
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if (c == '"' || c == '\'') {
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return nextString(c);
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}
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// Object
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if (c == '{') {
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back();
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return jsonObject();
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}
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// JSON Array
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if (c == '[') {
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back();
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return jsonArray();
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}
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#ifdef __PIKE__
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String.Buffer sb = String.Buffer();
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#else
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string sb = "";
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#endif
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int b = c;
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while (c >= ' ' && c != ':' && c != ',' && c != ']' && c != '}' && c != '/') {
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sb+=int2char(c);
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c = next();
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}
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back();
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s = trim_whites(SBGET(sb));
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if (s == "true")
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return 1;
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if (s == "false")
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return 0;
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if (s == "null")
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return UNDEFINED;
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if ((b >= '0' && b <= '9') || b == '.' || b == '-' || b == '+') {
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int a; float b_; string c_;
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sscanf(s, "%d%s", a, c_);
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if ((c_ && sizeof(c_))) {
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#ifdef __PIKE__
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sscanf(s, "%f", b_);
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#else
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b_ = to_float(s);
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#endif
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return b_;
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}
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if (!a || s != to_string(a)) {
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// some values of json ints exceed the limits of MAX_INT.
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// in that case we tried to use float, but rendering floats
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// will produce something like 2.17734e+09 instead of just
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// a long integer. we have to return a string here, and risk
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// to run into runtime errors. we should probably stop trying
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// to convert json integers into ints in the first place.
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// javascript and lpc just aren't compatible. do we have a
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// bignum package for ldmud?
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P3(("Warning: JSON integer too big. Returning %O as string.\n", s))
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return s;
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}
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else return a;
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}
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if (s == "") {
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THROW("Missing value.\n");
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}
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return s;
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}
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/// <summary>
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/// Skip characters until the next character is the requested character.
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/// If the requested character is not found, no characters are skipped.
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/// </summary>
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/// <param name="to">A character to skip to.</param>
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/// <returns>
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/// The requested character, or zero if the requested character is not found.
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/// </returns>
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PROTECTED int skipTo(int to) {
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int c;
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int i = myIndex;
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do {
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c = next();
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if (c == 0) {
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myIndex = i;
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return c;
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}
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}while (c != to);
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back();
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return c;
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}
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/// <summary>
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/// Skip characters until past the requested string.
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/// If it is not found, we are left at the end of the source.
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/// </summary>
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/// <param name="to">A string to skip past.</param>
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PROTECTED void skipPast(string to) {
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myIndex = search(mySource, to, myIndex);
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if (myIndex < 0) {
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myIndex = sizeof(mySource);
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} else {
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myIndex += sizeof(to);
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}
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}
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// TODO implement exception SyntaxError
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/// <summary>
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/// Make a printable string of this JSONTokener.
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/// </summary>
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/// <returns>" at character [myIndex] of [mySource]"</returns>
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PROTECTED string ToString() {
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return " at character " + myIndex + " of " + mySource;
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}
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