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got parsing working using PCRE; updated testinput.i

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This commit is contained in:
Josh Holtrop 2010-04-08 11:15:55 -04:00
parent 42ada6ee17
commit 1ae6878fb1
2 changed files with 78 additions and 52 deletions
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122
parse-input.cc
View File

@ -43,6 +43,8 @@ bool parse_input(char * buff, int size)
sections["tokens"] = tokens;
sections["rules"] = rules;
Section section = none;
string line;
bool append_line = false;
for (int i = 0; i < sizeof(exprs)/sizeof(exprs[0]); i++)
{
@ -64,16 +66,36 @@ bool parse_input(char * buff, int size)
{
line_length--;
}
string line(input, line_length);
if (pcre_exec(empty, NULL, line.c_str(), line.size(), 0, 0,
ovector, ovec_size) == 0)
continue;
if (pcre_exec(comment, NULL, line.c_str(), line.size(), 0, 0,
ovector, ovec_size) == 0)
continue;
if (pcre_exec(section_name, NULL, line.c_str(), line.size(), 0, 0,
ovector, ovec_size) == 0)
if (append_line)
{
line += string(input, line_length);
}
else
{
line = string(input, line_length);
}
if (line.size() > 0 && line[line.size()-1] == '\\')
{
line[line.size()-1] = ' ';
append_line = true;
}
else
{
append_line = false;
}
if ( append_line
|| (pcre_exec(empty, NULL, line.c_str(), line.size(),
0, 0, ovector, ovec_size) >= 0)
|| (pcre_exec(comment, NULL, line.c_str(), line.size(),
0, 0, ovector, ovec_size) >= 0)
)
{
/* nothing */;
}
else if (pcre_exec(section_name, NULL, line.c_str(), line.size(),
0, 0, ovector, ovec_size) >= 0)
{
sn = string(input, ovector[2], ovector[3] - ovector[2]);
if (sections.find(sn) != sections.end())
{
section = sections[sn];
@ -83,51 +105,55 @@ bool parse_input(char * buff, int size)
cerr << "Unknown section name '" << sn << "'!" << endl;
return false;
}
continue;
}
switch (section)
else
{
case none:
cerr << "Unrecognized input on line " << lineno << endl;
return false;
case tokens:
if (pcre_exec(token, NULL, line.c_str(), line.size(), 0, 0,
ovector, ovec_size) == 0)
{
string name(line, ovector[2], ovector[3] - ovector[2]);
string definition(line,
ovector[4], ovector[5] - ovector[4]);
string flags;
if (ovector[6] >= 0 && ovector[7] >= 0)
switch (section)
{
case none:
cerr << "Unrecognized input on line " << lineno << endl;
return false;
case tokens:
if (pcre_exec(token, NULL, line.c_str(), line.size(),
0, 0, ovector, ovec_size) >= 0)
{
flags = string(line,
ovector[6], ovector[7] - ovector[6]);
string name(line, ovector[2], ovector[3] - ovector[2]);
string definition(line,
ovector[4], ovector[5] - ovector[4]);
string flags;
if (ovector[6] >= 0 && ovector[7] >= 0)
{
flags = string(line,
ovector[6], ovector[7] - ovector[6]);
}
/* TODO: process token */
}
/* TODO: process token */
}
else
{
cerr << "Unrecognized input on line " << lineno << endl;
return false;
}
break;
case rules:
if (pcre_exec(rule, NULL, line.c_str(), line.size(), 0, 0,
ovector, ovec_size) == 0)
{
string name(line, ovector[2], ovector[3] - ovector[2]);
string definition(line,
ovector[4], ovector[5] - ovector[4]);
/* TODO: process rule */
}
else
{
cerr << "Unrecognized input on line " << lineno << endl;
return false;
}
break;
else
{
cerr << "Unrecognized input on line " << lineno << endl;
return false;
}
break;
case rules:
if (pcre_exec(rule, NULL, line.c_str(), line.size(),
0, 0, ovector, ovec_size) >= 0)
{
string name(line, ovector[2], ovector[3] - ovector[2]);
string definition(line,
ovector[4], ovector[5] - ovector[4]);
/* TODO: process rule */
}
else
{
cerr << "Unrecognized input on line " << lineno << endl;
return false;
}
break;
}
}
input = newline + 1;
lineno++;
}
return true;
}

8
testinput.i
View File

@ -1,13 +1,13 @@
[tokens]
ASSIGN := ":="
DASSIGN := ":=="
IDENTIFIER := "[a-zA-Z_][a-zA-Z_0-9]*"
ASSIGN :=
DASSIGN :==
IDENTIFIER [a-zA-Z_][a-zA-Z_0-9]*
[rules]
Assignment := IDENTIFIER ASSIGN Expression
Expression := IDENTIFIER
Expression := IDENTIFIER \
| Assignment