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let the past begone in cvs land. welcome to igit igit!
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PSYC
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509 changed files with 77963 additions and 0 deletions
398
world/net/spyc/parse.c
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398
world/net/spyc/parse.c
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// vim:foldmethod=marker:syntax=lpc:noexpandtab
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// $Id: parse.c,v 1.24 2008/03/29 16:00:02 fippo Exp $
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//
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#include "psyc.h"
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#include <net.h>
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#include <input_to.h>
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private string buffer;
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private string body_buffer;
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int state;
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int body_len;
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int may_parse_more;
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// tempoary used to hold assigment lists vname -> ({ glyph, state, vvalue })
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array(mixed) tvars;
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mapping hvars;
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// this is completely anti-psyc. it should take mcs as arguments
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// and look up the actual message from textdb.. FIXME
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#define PARSEERROR(reason) { debug_message("PSYC PARSE ERROR: " reason "\n"); \
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croak("_error_syntax_broken", "Failed parsing: " \
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reason); \
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return 0; \
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}
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#define DELIM S_GLYPH_PACKET_DELIMITER "\n"
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#define C_LINEFEED '\n'
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#define MVAR_GLYPH 0
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#define MVAR_STATE 1
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#define MVAR_VALUE 2
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step(); // prototype
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// reset parser state
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void parser_reset() {
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if (state != PSYCPARSE_STATE_BLOCKED)
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state = PSYCPARSE_STATE_HEADER;
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body_len = 0;
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body_buffer = 0;
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may_parse_more = 1;
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tvars = ({ });
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hvars = ([ ]);
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}
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// initialize the parser
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void parser_init() {
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buffer = "";
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parser_reset();
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state = PSYCPARSE_STATE_GREET; // AFTER reset
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}
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// it is sometimes useful to stop parsing
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void interrupt_parse() {
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state = PSYCPARSE_STATE_BLOCKED;
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}
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// and resume after some blocking operation is done
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void resume_parse() {
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state = PSYCPARSE_STATE_HEADER;
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}
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// input data to the buffer
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void feed(string data) {
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# ifdef _flag_log_sockets_PSYC
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log_file("RAW_PSYC", "» %O\n%s\n", ME, data);
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# endif
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buffer += data;
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do {
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may_parse_more = 0;
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step();
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} while (may_parse_more);
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}
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// overload this as needed
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varargs mixed croak(string mc, string data, vamapping vars, vamixed source) {
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return 0;
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}
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// called when a complete packet has arrived
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void done(mixed header_vars, mixed varops, mixed method, mixed body) {
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parser_reset();
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}
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// processes routing header variable assignments
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// basic version does no state
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mapping process_header(mixed varops) {
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mapping vars = ([ ]);
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// apply mmp state
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foreach(mixed vop : varops) {
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string vname = vop[0];
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switch(vop[1]) {
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case C_GLYPH_MODIFIER_SET:
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vars[vname] = vop[2];
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break;
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case C_GLYPH_MODIFIER_AUGMENT:
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case C_GLYPH_MODIFIER_DIMINISH:
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case C_GLYPH_MODIFIER_QUERY:
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case C_GLYPH_MODIFIER_ASSIGN:
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PARSEERROR("header modifier with glyph other than ':', this is not implemented")
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break;
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default:
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PARSEERROR("header modifier with unknown glyph")
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break;
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}
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// FIXME: not every legal varname is a mmp varname
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// look at shared_memory("routing")
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if (!legal_keyword(vname) || abbrev("_INTERNAL", vname)) {
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PARSEERROR("illegal varname in header")
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}
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}
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return vars;
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}
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// parse the header part of the packet
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// i.e. that is all mmp modifiers
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// switch to content buffering mode afterwards
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void parse_header() {
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if (!strlen(buffer)) return;
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if (buffer[0] == C_GLYPH_PACKET_DELIMITER) {
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if (strlen(buffer) < 2)
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return;
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if (buffer[1] == C_LINEFEED) {
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buffer = buffer[2..];
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hvars = process_header(tvars);
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tvars = ({ });
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done(hvars, tvars, 0, 0);
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} else {
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// this one is sth like |whatever
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// actually this should be noglyph i think
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PARSEERROR("strange thing")
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}
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} else if (buffer[0] == C_LINEFEED) {
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// state transition from parsing header to buffering body
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buffer = buffer[1..];
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hvars = process_header(tvars);
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tvars = ({ });
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// FIXME: validate source/context here
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state = PSYCPARSE_STATE_CONTENT;
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if (hvars["_length"])
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body_len = to_int(hvars["_length"][MVAR_VALUE]);
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step();
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} else { // parse mmp-header
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int fit;
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int glyph;
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string vname, vvalue;
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switch(buffer[0]) {
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case C_GLYPH_MODIFIER_SET:
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case C_GLYPH_MODIFIER_ASSIGN:
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case C_GLYPH_MODIFIER_AUGMENT:
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case C_GLYPH_MODIFIER_DIMINISH:
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case C_GLYPH_MODIFIER_QUERY:
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glyph = buffer[0];
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buffer = buffer[1..];
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break;
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default:
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PARSEERROR("noglyph")
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}
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fit = sscanf(buffer, "%.1s%t", vname);
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if (fit != 1) {
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PARSEERROR("vname")
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}
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buffer = buffer[strlen(vname)..];
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switch(buffer[0]) {
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case '\t':
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fit = sscanf(buffer, "\t%s\n%.0s", vvalue, buffer);
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if (fit != 2) {
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PARSEERROR("simple-arg")
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}
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break;
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case '\n': // deletion
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// this is currently implemented as "vvalue is 0" internally
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// and must handled in done() when merging
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buffer = buffer[1..];
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break;
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default:
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PARSEERROR("arg")
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}
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tvars += ({ ({ vname, glyph, vvalue }) });
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step();
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}
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}
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// parse all psyc-modifiers
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// this differes from the mmp modifiers in the sense that
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// a) packet is known to be complete here
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// b) psyc modifiers may have binary args
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void parse_psyc() {
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while(1) { // slurp in all psyc-modifiers
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int fit, len;
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int glyph;
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string vname, vvalue;
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switch(body_buffer[0]) {
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case C_GLYPH_MODIFIER_SET:
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case C_GLYPH_MODIFIER_ASSIGN:
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case C_GLYPH_MODIFIER_AUGMENT:
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case C_GLYPH_MODIFIER_DIMINISH:
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case C_GLYPH_MODIFIER_QUERY:
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glyph = body_buffer[0];
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body_buffer = body_buffer[1..];
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break;
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default:
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// this is the method
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return;
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}
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fit = sscanf(body_buffer, "%.1s%t", vname);
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if (fit != 1) {
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PARSEERROR("vname")
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}
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body_buffer = body_buffer[strlen(vname)..];
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switch(body_buffer[0]) {
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case ' ':
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fit = sscanf(body_buffer, " %d\t%.0s", len, body_buffer);
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if (fit != 2) {
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PARSEERROR("binary-arg length")
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}
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if (len < 0) {
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PARSEERROR("negative binary length")
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}
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if (strlen(body_buffer) < len) {
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PARSEERROR("not enough to read binary arg, may not happen")
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}
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vvalue = body_buffer[..len-1];
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body_buffer = body_buffer[len..];
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if (body_buffer[0] != C_LINEFEED) {
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PARSEERROR("binary terminal")
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}
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body_buffer = body_buffer[1..];
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break;
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case '\t':
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fit = sscanf(body_buffer, "\t%s\n%.0s", vvalue, body_buffer);
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if (fit != 2) {
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PARSEERROR("simple-arg")
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}
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break;
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case '\n':
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switch(glyph) {
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case C_GLYPH_MODIFIER_ASSIGN:
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// delete this context's state
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PARSEERROR("tbd")
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// unfortunately the routing hasn't been processed at
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// this moment yet, so we don't know whose context this
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// is and if it is legitimate. we first have to fix the
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// processing of the routing layer before we can implement
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// anything of this
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continue;
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case C_GLYPH_MODIFIER_SET:
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// remember to temporarily ignore state
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PARSEERROR("tbd")
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continue;
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case C_GLYPH_MODIFIER_QUERY:
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// mark that the next reply packet should
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// contain a state sync
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PARSEERROR("tbd")
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continue;
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default:
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PARSEERROR("undefined operation")
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}
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return;
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default:
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PARSEERROR("arg")
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}
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tvars += ({ ({ vname, glyph, vvalue }) });
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}
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}
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// parse completed content
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void parse_content() {
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int fit;
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string method, body;
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parse_psyc();
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// ASSERT strlen(buffer)
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if (body_buffer[0] == C_LINEFEED) {
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PARSEERROR("empty method")
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}
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// FIXME: i am not sure if this is correct...
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if (body_buffer == S_GLYPH_PACKET_DELIMITER) {
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P0(("encountered packet delimiter in packet body? how's that?\n"))
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done(hvars, tvars, 0, 0);
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return;
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}
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fit = sscanf(body_buffer, "%.1s\n%.0s", method, body_buffer);
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if (fit != 2 || !legal_keyword(method)) {
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croak("_error_illegal_method",
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"That's not a valid method name.");
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return; // NOTREACHED
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}
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// mhmm... why does body_buffer still contain the newline?
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// because the newline is by definition not part of the body!
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if (strlen(body_buffer)) body = body_buffer[..<2];
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done(hvars, tvars, method, body);
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}
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// buffer content until complete
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// then parse it
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// note: you could overload this, if you just want to route
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// the packet
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void buffer_content() {
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int t;
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if (body_len && strlen(buffer) >= body_len + 3) {
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// make sure that the packet is properly terminated
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if (buffer[body_len..body_len+2] != "\n" DELIM) {
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PARSEERROR("binary packet delimiter")
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}
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body_buffer = buffer[..body_len];
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buffer = buffer[body_len+3..];
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parse_content();
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} else if ((t = strstr(buffer, "\n" DELIM)) != -1) {
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body_buffer = buffer[..t];
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buffer = buffer[t+3..];
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parse_content();
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} else {
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}
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}
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// respond to the first empty packet
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void first_response() {
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P0(("parser::first_response called. overload this!"))
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}
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// parser stepping function
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void step() {
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if (!strlen(buffer))
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return;
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switch(state) {
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case PSYCPARSE_STATE_HEADER:
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parse_header();
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break;
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case PSYCPARSE_STATE_CONTENT:
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buffer_content();
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break;
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case PSYCPARSE_STATE_BLOCKED:
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// someone requested to stop parsing - e.g. _request_features circuit
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// message
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break;
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case PSYCPARSE_STATE_GREET: // wait for greeting
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if (strlen(buffer) < 2)
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return;
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if (buffer[0..1] == DELIM) {
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state = PSYCPARSE_STATE_HEADER;
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buffer = buffer[2..];
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first_response();
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step();
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} else {
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croak("_error_syntax_initialization",
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"The protocol begins with a pipe and a line feed.");
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}
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break;
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default: // uhm... if we ever get here this is the programmers fault
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break;
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}
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}
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// FIXME should be in a standalone module
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//#define PARSEERROR(args) debug_message(sprintf("LIST PARSE ERROR: " args));
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#define LISTSEP '|'
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#define LISTPARSE_FAIL -1
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#define LISTMODE_PLAIN 0
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#define LISTMODE_BINARY 1
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// list parsing function - val is assumed to be stripped of the final LF
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mixed list_parse(string val) {
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mixed *lv = ({ });
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if (val[0] == LISTSEP)
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return explode(val[1..], "|");
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while(strlen(val)) {
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int fit, len;
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fit = sscanf(val, "%d %s", len, val);
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if (fit != 2) {
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// invalid binary fit
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return LISTPARSE_FAIL;
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}
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if (len < 0 || len > strlen(val)) {
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// invalid binary length
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return LISTPARSE_FAIL;
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}
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if (len != strlen(val) && val[len] != LISTSEP) {
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// listsep not found after binary
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return LISTPARSE_FAIL;
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}
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lv += ({ val[..len-1] });
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val = val[len+1..];
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}
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return lv;
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}
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#ifdef SELFTESTS
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test() {
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list_parse("|psyc://example.symlynX.com/~jim|psyc://example.org/~judy");
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list_parse("5\tabcde|4\tabcd");
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}
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#endif
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