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|
/* -*- Mode: C -*-
======================================================================
FILE: icalparser.c
CREATOR: eric 04 August 1999
$Id$
$Locker$
The contents of this file are subject to the Mozilla Public License
Version 1.0 (the "License"); you may not use this file except in
compliance with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
the License for the specific language governing rights and
limitations under the License.
This program is free software; you can redistribute it and/or modify
it under the terms of either:
The LGPL as published by the Free Software Foundation, version
2.1, available at: http://www.fsf.org/copyleft/lesser.html
Or:
The Mozilla Public License Version 1.0. You may obtain a copy of
the License at http://www.mozilla.org/MPL/
The Initial Developer of the Original Code is Eric Busboom
(C) COPYRIGHT 2000, Eric Busboom, http://www.softwarestudio.org
======================================================================*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "icalparser.h"
#include "pvl.h"
#include "icalmemory.h"
#include "icalerror.h"
#include "icalvalue.h"
#include "icalparameter.h"
#include "icalproperty.h"
#include "icalcomponent.h"
#include <string.h> /* For strncpy & size_t */
#include <stdio.h> /* For FILE and fgets and sprintf */
#include <stdlib.h> /* for free */
extern icalvalue* icalparser_yy_value;
void set_parser_value_state(icalvalue_kind kind);
int ical_yyparse(void);
char* icalparser_get_next_char(char c, char *str);
char* icalparser_get_next_parameter(char* line,char** end);
char* icalparser_get_next_value(char* line, char **end, icalvalue_kind kind);
char* icalparser_get_prop_name(char* line, char** end);
char* icalparser_get_param_name(char* line, char **end);
#define TMP_BUF_SIZE 80
struct icalparser_impl
{
int buffer_full;
size_t tmp_buf_size;
char temp[TMP_BUF_SIZE];
icalcomponent *root_component;
icalcomponent *tail;
int version;
int level;
int lineno;
icalparser_state state;
pvl_list components;
void *line_gen_data;
};
icalparser* icalparser_new(void)
{
struct icalparser_impl* impl = 0;
if ( ( impl = (struct icalparser_impl*)
malloc(sizeof(struct icalparser_impl))) == 0) {
icalerror_set_errno(ICAL_NEWFAILED_ERROR);
return 0;
}
impl->root_component = 0;
impl->components = pvl_newlist();
impl->level = 0;
impl->state = ICALPARSER_SUCCESS;
impl->tmp_buf_size = TMP_BUF_SIZE;
impl->buffer_full = 0;
impl->lineno = 0;
memset(impl->temp,0, TMP_BUF_SIZE);
return (icalparser*)impl;
}
void icalparser_free(icalparser* parser)
{
struct icalparser_impl* impl = (struct icalparser_impl*)parser;
icalcomponent *c;
if (impl->root_component != 0){
icalcomponent_free(impl->root_component);
}
while( (c=pvl_pop(impl->components)) != 0){
icalcomponent_free(c);
}
pvl_free(impl->components);
free(impl);
}
void icalparser_set_gen_data(icalparser* parser, void* data)
{
struct icalparser_impl* impl = (struct icalparser_impl*)parser;
impl->line_gen_data = data;
}
icalvalue* icalvalue_new_From_string_with_error(icalvalue_kind kind,
char* str,
icalproperty **error);
char* icalparser_get_next_char(char c, char *str)
{
int quote_mode = 0;
char* p;
for(p=str; *p!=0; p++){
if ( quote_mode == 0 && *p=='"' && *(p-1) != '\\' ){
quote_mode =1;
continue;
}
if ( quote_mode == 1 && *p=='"' && *(p-1) != '\\' ){
quote_mode =0;
continue;
}
if (quote_mode == 0 && *p== c && *(p-1) != '\\' ){
return p;
}
}
return 0;
}
/* make a new tmp buffer out of a substring */
char* make_segment(char* start, char* end)
{
char *buf;
size_t size = (size_t)end - (size_t)start;
buf = icalmemory_tmp_buffer(size+1);
strncpy(buf,start,size);
*(buf+size) = 0;
return buf;
}
const char* input_buffer;
const char* input_buffer_p;
#define min(a,b) ((a) < (b) ? (a) : (b))
int icalparser_flex_input(char* buf, int max_size)
{
int n = min(max_size,strlen(input_buffer_p));
if (n > 0){
memcpy(buf, input_buffer_p, n);
input_buffer_p += n;
return n;
} else {
return 0;
}
}
void icalparser_clear_flex_input(void)
{
input_buffer_p = input_buffer+strlen(input_buffer);
}
/* Cal the flex parser to parse a complex value */
icalvalue* icalparser_parse_value(icalvalue_kind kind,
const char* str, icalproperty** error)
{
int r;
input_buffer_p = input_buffer = str;
set_parser_value_state(kind);
icalparser_yy_value = 0;
r = ical_yyparse();
/* Error. Parse failed */
if( icalparser_yy_value == 0 || r != 0){
if(icalparser_yy_value !=0){
icalvalue_free(icalparser_yy_value);
icalparser_yy_value = 0;
}
return 0;
}
if (error != 0){
*error = 0;
}
return icalparser_yy_value;
}
char* icalparser_get_prop_name(char* line, char** end)
{
char* p;
char* v;
char *str;
p = icalparser_get_next_char(';',line);
v = icalparser_get_next_char(':',line);
if (p== 0 && v == 0) {
return 0;
}
/* There is no ';' or, it is after the ';' that marks the beginning of
the value */
if (v!=0 && ( p == 0 || p > v)){
str = make_segment(line,v);
*end = v+1;
} else {
str = make_segment(line,p);
*end = p+1;
}
return str;
}
char* icalparser_get_param_name(char* line, char **end)
{
char* next;
char *str;
next = icalparser_get_next_char('=',line);
if (next == 0) {
return 0;
}
str = make_segment(line,next);
*end = next+1;
return str;
}
char* icalparser_get_next_paramvalue(char* line, char **end)
{
char* next;
char *str;
next = icalparser_get_next_char(',',line);
if (next == 0){
next = (char*)(size_t)line+(size_t)strlen(line);\
}
if (next == line){
return 0;
} else {
str = make_segment(line,next);
*end = next+1;
return str;
}
}
/* A property may have multiple values, if the values are seperated by
commas in the content line. This routine will look for the next
comma after line and will set the next place to start searching in
end. */
char* icalparser_get_next_value(char* line, char **end, icalvalue_kind kind)
{
char* next;
char *p;
char *str;
size_t length = strlen(line);
p = line;
while(1){
next = icalparser_get_next_char(',',p);
/* Unforunately, RFC2445 says that for the RECUR value, COMMA
can both seperate digits in a list, and it can seperate
multiple recurrence specifications. This is not a friendly
part of the spec. This weirdness tries to
distinguish the two uses. it is probably a HACK*/
if( kind == ICAL_RECUR_VALUE ) {
if ( next != 0 &&
(*end+length) > next+5 &&
strncmp(next,"FREQ",4) == 0
) {
/* The COMMA was followed by 'FREQ', is it a real seperator*/
/* Fall through */
} else if (next != 0){
/* Not real, get the next COMMA */
p = next+1;
next = 0;
continue;
}
}
/* If the comma is preceeded by a '\', then it is a literal and
not a value seperator*/
if ( (next!=0 && *(next-1) == '\\') ||
(next!=0 && *(next-3) == '\\')
)
/*second clause for '/' is on prev line. HACK may be out of bounds */
{
p = next+1;
} else {
break;
}
}
if (next == 0){
next = (char*)(size_t)line+length;
*end = next;
} else {
*end = next+1;
}
if (next == line){
return 0;
}
str = make_segment(line,next);
return str;
}
char* icalparser_get_next_parameter(char* line,char** end)
{
char *next;
char *v;
char *str;
v = icalparser_get_next_char(':',line);
next = icalparser_get_next_char(';', line);
/* There is no ';' or, it is after the ':' that marks the beginning of
the value */
if (next == 0 || next > v) {
next = icalparser_get_next_char(':', line);
}
if (next != 0) {
str = make_segment(line,next);
*end = next+1;
return str;
} else {
*end = line;
return 0;
}
}
/* Get a single property line, from the property name through the
final new line, and include any continuation lines */
char* icalparser_get_line(icalparser *parser,
char* (*line_gen_func)(char *s, size_t size, void *d))
{
char *line;
char *line_p;
struct icalparser_impl* impl = (struct icalparser_impl*)parser;
size_t buf_size = impl->tmp_buf_size;
line_p = line = icalmemory_new_buffer(buf_size);
line[0] = '\0';
while(1) {
/* The buffer is not clear, so transfer the data in it to the
output. This may be left over from a previous call */
if (impl->temp[0] != '\0' ) {
/* If the last position in the temp buffer is occupied,
mark the buffer as full. The means we will do another
read later, because the line is not finished */
if (impl->temp[impl->tmp_buf_size-1] == 0 &&
impl->temp[impl->tmp_buf_size-2] != '\n'){
impl->buffer_full = 1;
} else {
impl->buffer_full = 0;
}
/* Copy the temp to the output and clear the temp buffer. */
icalmemory_append_string(&line,&line_p,&buf_size,impl->temp);
impl->temp[0] = '\0' ;
}
impl->temp[impl->tmp_buf_size-1] = 1; /* Mark end of buffer */
if ((*line_gen_func)(impl->temp,impl->tmp_buf_size,impl->line_gen_data)
==0){/* Get more data */
/* If the first position is clear, it means we didn't get
any more data from the last call to line_ge_func*/
if (impl->temp[0] == '\0'){
if(line[0] != '\0'){
/* There is data in the output, so fall trhough and process it*/
break;
} else {
/* No data in output; return and signal that there
is no more input*/
free(line);
return 0;
}
}
}
/* If the output line ends in a '\n' and the temp buffer
begins with a ' ', then the buffer holds a continuation
line, so keep reading. */
if ( line_p > line+1 && *(line_p-1) == '\n' && impl->temp[0] == ' ') {
/* back up the pointer to erase the continuation characters */
line_p--;
if ( *(line_p-1) == '\r'){
line_p--;
}
/* shift the temp buffer down to eliminate the leading space*/
memmove(&(impl->temp[0]),&(impl->temp[1]),impl->tmp_buf_size);
impl->temp[impl->tmp_buf_size-1] = impl->temp[impl->tmp_buf_size-2];
} else if ( impl->buffer_full == 1 ) {
/* The buffer was filled on the last read, so read again */
} else {
/* Looks like the end of this content line, so break */
break;
}
}
/* Erase the final newline and/or carriage return*/
if ( line_p > line+1 && *(line_p-1) == '\n') {
*(line_p-1) = '\0';
if ( *(line_p-2) == '\r'){
*(line_p-2) = '\0';
}
} else {
*(line_p) = '\0';
}
return line;
}
void insert_error(icalcomponent* comp, char* text,
char* message, icalparameter_xlicerrortype type)
{
char temp[1024];
if (text == 0){
snprintf(temp,1024,"%s:",message);
} else {
snprintf(temp,1024,"%s: \'%s\'",message,text);
}
icalcomponent_add_property
(comp,
icalproperty_vanew_xlicerror(
temp,
icalparameter_new_xlicerrortype(type),
0));
}
icalcomponent* icalparser_parse(icalparser *parser,
char* (*line_gen_func)(char *s, size_t size,
void* d))
{
char* line;
icalcomponent *c=0;
icalcomponent *root_component=0;
icalerror_check_arg_rz((parser !=0),"parser");
do{
line = icalparser_get_line(parser, line_gen_func);
if ((c = icalparser_add_line(parser,line)) != 0){
if (root_component == 0){
/* Just one component */
icalparser_claim(parser);
root_component = c;
} else if(icalcomponent_isa(root_component)
!= ICAL_XROOT_COMPONENT) {
/*Got a second component, so move the two components under
an XROOT container */
icalcomponent *tempc;
tempc = icalcomponent_new(ICAL_XROOT_COMPONENT);
icalcomponent_add_component(tempc, root_component);
icalparser_claim(parser);
icalcomponent_add_component(tempc, c);
root_component = tempc;
} else {
/* Already have an XROOT container, so add the component
to it*/
icalcomponent_add_component(root_component, c);
icalparser_claim(parser);
}
}
if(line != 0){
free(line);
}
} while ( line != 0);
return root_component;
}
icalcomponent* icalparser_add_line(icalparser* parser,
char* line)
{
char *p;
char *str;
char *end;
int vcount = 0;
icalproperty *prop;
icalvalue *value;
icalvalue_kind value_kind = ICAL_NO_VALUE;
struct icalparser_impl *impl = (struct icalparser_impl*)parser;
icalerror_check_arg_rz((parser != 0),"parser");
if (line == 0)
{
impl->state = ICALPARSER_ERROR;
return 0;
}
/* Begin by getting the property name at the start of the line. The
property name may end up being "BEGIN" or "END" in which case it
is not really a property, but the marker for the start or end of
a component */
end = 0;
str = icalparser_get_prop_name(line, &end);
if (str == 0){
/* Could not get a property name */
icalcomponent *tail = pvl_data(pvl_tail(impl->components));
if (tail){
insert_error(tail,line,
"Got a data line, but could not find a property name or component begin tag",
ICAL_XLICERRORTYPE_COMPONENTPARSEERROR);
}
tail = 0;
impl->state = ICALPARSER_ERROR;
return 0;
}
/**********************************************************************
* Handle begin and end of components
**********************************************************************/
/* If the property name is BEGIN or END, we are actually
starting or ending a new component */
if(strcmp(str,"BEGIN") == 0){
icalcomponent *c;
impl->level++;
str = icalparser_get_next_value(end,&end, value_kind);
c = icalcomponent_new_from_string(str);
if (c == 0){
c = icalcomponent_new(ICAL_XLICINVALID_COMPONENT);
insert_error(c,str,"Parse error in component name",
ICAL_XLICERRORTYPE_COMPONENTPARSEERROR);
}
pvl_push(impl->components,c);
impl->state = ICALPARSER_BEGIN_COMP;
return 0;
} else if (strcmp(str,"END") == 0 ) {
icalcomponent* tail;
impl->level--;
str = icalparser_get_next_value(end,&end, value_kind);
impl->root_component = pvl_pop(impl->components);
tail = pvl_data(pvl_tail(impl->components));
if(tail != 0){
icalcomponent_add_component(tail,impl->root_component);
}
tail = 0;
/* Return the component if we are back to the 0th level */
if (impl->level == 0){
impl->state = ICALPARSER_SUCCESS;
return impl->root_component;
} else {
impl->state = ICALPARSER_END_COMP;
return 0;
}
}
/* There is no point in continuing if we have not seen a
component yet */
if(pvl_data(pvl_tail(impl->components)) == 0){
impl->state = ICALPARSER_ERROR;
return 0;
}
/**********************************************************************
* Handle property names
**********************************************************************/
/* At this point, the property name really is a property name,
(Not a component name) so make a new property and add it to
the component */
prop = icalproperty_new_from_string(str);
if (prop != 0){
icalcomponent *tail = pvl_data(pvl_tail(impl->components));
icalcomponent_add_property(tail, prop);
/* Set the value kind for the default for this type of
property. This may be re-set by a VALUE parameter */
value_kind =
icalenum_property_kind_to_value_kind(
icalproperty_isa(prop));
} else {
icalcomponent* tail = pvl_data(pvl_tail(impl->components));
insert_error(tail,str,"Parse error in property name",
ICAL_XLICERRORTYPE_PROPERTYPARSEERROR);
tail = 0;
impl->state = ICALPARSER_ERROR;
return 0;
}
/**********************************************************************
* Handle parameter values
**********************************************************************/
/* Now, add any parameters to the last property */
p = 0;
while(1) {
if (*(end-1) == ':'){
/* if the last seperator was a ":" and the value is a
URL, icalparser_get_next_parameter will find the
':' in the URL, so better break now. */
break;
}
str = icalparser_get_next_parameter(end,&end);
if (str != 0){
char* name;
char* pvalue;
icalparameter *param = 0;
icalparameter_kind kind;
icalcomponent *tail = pvl_data(pvl_tail(impl->components));
name = icalparser_get_param_name(str,&pvalue);
if (name == 0){
/* 'tail' defined above */
insert_error(tail, str, "Can't parse parameter name",
ICAL_XLICERRORTYPE_PARAMETERNAMEPARSEERROR);
tail = 0;
break;
}
kind = icalenum_string_to_parameter_kind(name);
if (kind != ICAL_NO_PARAMETER){
param = icalparameter_new_from_string(kind,pvalue);
} else {
/* Error. Failed to parse the parameter*/
/* 'tail' defined above */
insert_error(tail, str, "Can't parse parameter name",
ICAL_XLICERRORTYPE_PARAMETERNAMEPARSEERROR);
tail = 0;
impl->state = ICALPARSER_ERROR;
return 0;
}
if (param == 0){
/* 'tail' defined above */
insert_error(tail,str,"Can't parse parameter value",
ICAL_XLICERRORTYPE_PARAMETERVALUEPARSEERROR);
tail = 0;
impl->state = ICALPARSER_ERROR;
continue;
}
/* If it is a VALUE parameter, set the kind of value*/
if (icalparameter_isa(param)==ICAL_VALUE_PARAMETER){
value_kind = (icalvalue_kind)
icalparameter_get_value(param);
if (value_kind == ICAL_NO_VALUE){
/* Ooops, could not parse the value of the
parameter ( it was not one of the defined
values ), so reset the value_kind */
insert_error(
tail, str,
"Got a VALUE parameter with an unknown type",
ICAL_XLICERRORTYPE_PARAMETERVALUEPARSEERROR);
icalparameter_free(param);
value_kind =
icalenum_property_kind_to_value_kind(
icalproperty_isa(prop));
icalparameter_free(param);
tail = 0;
impl->state = ICALPARSER_ERROR;
return 0;
}
}
/* Everything is OK, so add the parameter */
icalproperty_add_parameter(prop,param);
tail = 0;
} else { /* if ( str != 0) */
/* If we did not get a param string, go on to looking
for a value */
break;
} /* if ( str != 0) */
} /* while(1) */
/**********************************************************************
* Handle values
**********************************************************************/
/* Look for values. If there are ',' characters in the values,
then there are multiple values, so clone the current
parameter and add one part of the value to each clone */
vcount=0;
while(1) {
str = icalparser_get_next_value(end,&end, value_kind);
if (str != 0){
if (vcount > 0){
/* Actually, only clone after the second value */
icalproperty* clone = icalproperty_new_clone(prop);
icalcomponent* tail = pvl_data(pvl_tail(impl->components));
icalcomponent_add_property(tail, clone);
prop = clone;
tail = 0;
}
value = icalvalue_new_from_string(value_kind, str);
/* Don't add properties without value */
if (value == 0){
char temp[200]; /* HACK */
icalproperty_kind prop_kind = icalproperty_isa(prop);
icalcomponent* tail = pvl_data(pvl_tail(impl->components));
sprintf(temp,"Can't parse as %s value in %s property. Removing entire property",
icalenum_value_kind_to_string(value_kind),
icalenum_property_kind_to_string(prop_kind));
insert_error(tail, str, temp,
ICAL_XLICERRORTYPE_VALUEPARSEERROR);
/* Remove the troublesome property */
icalcomponent_remove_property(tail,prop);
icalproperty_free(prop);
prop = 0;
tail = 0;
impl->state = ICALPARSER_ERROR;
return 0;
} else {
vcount++;
icalproperty_set_value(prop, value);
}
} else {
if (vcount == 0){
char temp[200]; /* HACK */
icalproperty_kind prop_kind = icalproperty_isa(prop);
icalcomponent *tail = pvl_data(pvl_tail(impl->components));
sprintf(temp,"No value for %s property. Removing entire property",
icalenum_property_kind_to_string(prop_kind));
insert_error(tail, str, temp,
ICAL_XLICERRORTYPE_VALUEPARSEERROR);
/* Remove the troublesome property */
icalcomponent_remove_property(tail,prop);
icalproperty_free(prop);
prop = 0;
tail = 0;
impl->state = ICALPARSER_ERROR;
return 0;
} else {
break;
}
}
}
/****************************************************************
* End of component parsing.
*****************************************************************/
if (pvl_data(pvl_tail(impl->components)) == 0 &&
impl->level == 0){
impl->state = ICALPARSER_SUCCESS;
return impl->root_component;
} else {
impl->state = ICALPARSER_IN_PROGRESS;
return 0;
}
}
icalparser_state icalparser_get_state(icalparser* parser)
{
struct icalparser_impl* impl = (struct icalparser_impl*) parser;
return impl->state;
}
icalcomponent* icalparser_claim(icalparser* parser)
{
struct icalparser_impl* impl = (struct icalparser_impl*) parser;
icalcomponent *c = impl->root_component;
impl->root_component = 0;
return c;
}
icalcomponent* icalparser_clean(icalparser* parser)
{
struct icalparser_impl* impl = (struct icalparser_impl*) parser;
icalcomponent *tail = pvl_data(pvl_tail(impl->components));
icalerror_check_arg_rz((parser != 0 ),"parser");
/* We won't get a clean exit if some components did not have an
"END" tag. Clear off any component that may be left in the list */
while((tail=pvl_data(pvl_tail(impl->components))) != 0){
insert_error(tail," ",
"Missing END tag for this component. Closing component at end of input.",
ICAL_XLICERRORTYPE_COMPONENTPARSEERROR);
impl->root_component = pvl_pop(impl->components);
tail=pvl_data(pvl_tail(impl->components));
if(tail != 0){
icalcomponent_add_component(tail,impl->root_component);
}
}
return impl->root_component;
}
struct slg_data {
char* pos;
char* str;
};
char* string_line_generator(char *out, size_t buf_size, void *d)
{
char *n;
size_t size;
struct slg_data* data = (struct slg_data*)d;
if(data->pos==0){
data->pos=data->str;
}
/* If the pointer is at the end of the string, we are done */
if (*(data->pos)==0){
return 0;
}
n = strchr(data->pos,'\n');
if (n == 0){
size = strlen(data->pos);
} else {
n++; /* include newline in output */
size = (n-data->pos);
}
if (size > buf_size-1){
size = buf_size-1;
}
strncpy(out,data->pos,size);
*(out+size) = '\0';
data->pos += size;
return out;
}
icalcomponent* icalparser_parse_string(char* str)
{
icalcomponent *c;
struct slg_data d;
icalparser *p;
d.pos = 0;
d.str = str;
p = icalparser_new();
icalparser_set_gen_data(p,&d);
c = icalparser_parse(p,string_line_generator);
icalparser_free(p);
return c;
}
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