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skin_engine: rework the parser to be closer to the langauge grammar.

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The parser was unconditionally scanning things which it thought
were conditional/enum lists (or tag arg lists) when they couldn't
possibly be (i.e < inside a param which should be valid).

This change fixes it (i.e %?and(%if(%pv, <, -50), %if(%mp, > 1))
is perfectly valid now.

This *may* break your exsiting skins if you were using %if with < or >

Change-Id: Ibcb42bc6bb78908f79de024b61276b91b1ce02a0
This commit is contained in:
Jonathan Gordon 2012-04-16 15:42:24 +10:00
parent e92fbb42d7
commit ec8b21eef8
3 changed files with 57 additions and 80 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

65
lib/skin_parser/skin_parser.c
View file

@ -182,26 +182,12 @@ static struct skin_element* skin_parse_viewport(const char** document)
}
else if(*cursor == TAGSYM)
{
/* A ';' directly after a '%' doesn't count */
cursor ++;
if(*cursor == '\0')
break;
cursor++;
skip_tag(&cursor);
}
else if(*cursor == COMMENTSYM)
{
skip_comment(&cursor);
}
else if(*cursor == ARGLISTOPENSYM)
{
skip_arglist(&cursor);
}
else if(*cursor == ENUMLISTOPENSYM)
{
skip_enumlist(&cursor);
}
else
{
/* Advancing the cursor as normal */
@ -445,20 +431,9 @@ static struct skin_element* skin_parse_sublines_optional(const char** document,
{
skip_comment(&cursor);
}
else if(*cursor == ENUMLISTOPENSYM)
{
skip_enumlist(&cursor);
}
else if(*cursor == ARGLISTOPENSYM)
{
skip_arglist(&cursor);
}
else if(*cursor == TAGSYM)
{
cursor++;
if(*cursor == '\0' || *cursor == '\n')
break;
cursor++;
skip_tag(&cursor);
}
else if(*cursor == MULTILINESYM)
{
@ -595,19 +570,12 @@ static int skin_parse_tag(struct skin_element* element, const char** document)
/* Skipping over escaped characters */
if(*cursor == TAGSYM)
{
cursor++;
if(*cursor == '\0')
break;
cursor++;
skip_tag(&cursor);
}
else if(*cursor == COMMENTSYM)
{
skip_comment(&cursor);
}
else if(*cursor == ARGLISTOPENSYM)
{
skip_arglist(&cursor);
}
else if(*cursor == ARGLISTSEPARATESYM)
{
num_args++;
@ -974,18 +942,9 @@ static int skin_parse_conditional(struct skin_element* element, const char** doc
{
skip_comment(&cursor);
}
else if(*cursor == ENUMLISTOPENSYM)
{
if (*cursor == '\n')
cursor++;
skip_enumlist(&cursor);
}
else if(*cursor == TAGSYM)
{
cursor++;
if(*cursor == '\0' || *cursor == '\n')
break;
cursor++;
skip_tag(&cursor);
}
else if(*cursor == ENUMLISTSEPARATESYM)
{
@ -1139,21 +1098,7 @@ static struct skin_element* skin_parse_code_as_arg(const char** document)
}
else if(*cursor == TAGSYM)
{
/* A ';' directly after a '%' doesn't count */
cursor ++;
if(*cursor == '\0')
break;
cursor++;
}
else if(*cursor == ARGLISTOPENSYM)
{
skip_arglist(&cursor);
}
else if(*cursor == ENUMLISTOPENSYM)
{
skip_enumlist(&cursor);
skip_tag(&cursor);
}
else
{

71
lib/skin_parser/skin_scan.c
View file

@ -28,6 +28,7 @@
#include "skin_debug.h"
#include "symbols.h"
#include "skin_parser.h"
#include "tag_table.h"
/* Scanning Functions */
@ -40,6 +41,54 @@ void skip_comment(const char** document)
(*document)++;
}
void skip_tag(const char** document)
{
char tag_name[MAX_TAG_LENGTH];
int i;
bool qmark;
const struct tag_info *tag;
const char *cursor;
if(**document == TAGSYM)
(*document)++;
qmark = (**document == CONDITIONSYM);
if (qmark)
(*document)++;
if (!qmark && find_escape_character(**document))
{
(*document)++;
}
else
{
cursor = *document;
/* Checking the tag name */
for (i=0; cursor[i] && i<MAX_TAG_LENGTH; i++)
tag_name[i] = cursor[i];
/* First we check the two characters after the '%', then a single char */
tag = NULL;
i = MAX_TAG_LENGTH;
while (!tag && i > 1)
{
tag_name[i-1] = '\0';
tag = find_tag(tag_name);
i--;
}
if (tag)
{
*document += strlen(tag->name);
}
}
if (**document == ARGLISTOPENSYM)
skip_arglist(document);
if (**document == ENUMLISTOPENSYM)
skip_enumlist(document);
}
void skip_arglist(const char** document)
{
if(**document == ARGLISTOPENSYM)
@ -47,16 +96,7 @@ void skip_arglist(const char** document)
while(**document && **document != ARGLISTCLOSESYM)
{
if(**document == TAGSYM)
{
(*document)++;
if(**document == '\0')
break;
(*document)++;
}
else if(**document == ARGLISTOPENSYM)
skip_arglist(document);
else if(**document == ENUMLISTOPENSYM)
skip_enumlist(document);
skip_tag(document);
else if(**document == COMMENTSYM)
skip_comment(document);
else
@ -73,16 +113,7 @@ void skip_enumlist(const char** document)
while(**document && **document != ENUMLISTCLOSESYM)
{
if(**document == TAGSYM)
{
(*document)++;
if(**document == '\0')
break;
(*document)++;
}
else if(**document == ARGLISTOPENSYM)
skip_arglist(document);
else if(**document == ENUMLISTOPENSYM)
skip_enumlist(document);
skip_tag(document);
else if(**document == COMMENTSYM)
skip_comment(document);
else

1
lib/skin_parser/skin_scan.h
View file

@ -29,6 +29,7 @@ extern "C"
/* Scanning functions */
void skip_tag(const char** document);
void skip_comment(const char** document);
void skip_arglist(const char** document);
void skip_enumlist(const char** document);