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d2html.d
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d2html.d
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/*
* Copyright (c) 2001
* Pavel "EvilOne" Minayev
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Author makes no representations about
* the suitability of this software for any purpose. It is provided
* "as is" without express or implied warranty.
*/
import std.c.stdio;
import std.conv;
import std.string;
import std.stream; // don't forget to link with stream.obj!
// colors for syntax highlighting, default values are
// my preferences in Microsoft Visual Studio editor
class Colors
{
static string keyword = "0000FF";
static string number = "008000";
static string astring = "000080";
static string comment = "808080";
}
const int tabsize = 4; // number of spaces in tab
const char[24] symbols = "()[]{}.,;:=<>+-*/%&|^!~?";
string[] keywords;
// true if c is whitespace, false otherwise
byte isspace(char c)
{
return indexOf(whitespace, c) >= 0;
}
// true if c is a letter or an underscore, false otherwise
byte isalpha(char c)
{
// underscore doesn't differ from letters in D anyhow...
return c == '_' || indexOf(letters, c) >= 0;
}
// true if c is a decimal digit, false otherwise
byte isdigit(char c)
{
return indexOf(digits, c) >= 0;
}
// true if c is a hexadecimal digit, false otherwise
byte ishexdigit(char c)
{
return indexOf(hexdigits, c) >= 0;
}
// true if c is an octal digit, false otherwise
byte isoctdigit(char c)
{
return indexOf(octdigits, c) >= 0;
}
// true if c is legal D symbol other than above, false otherwise
byte issymbol(char c)
{
return indexOf(symbols, c) >= 0;
}
// true if token is a D keyword, false otherwise
byte iskeyword(string token)
{
foreach (index, key; keywords)
{
if (!cmp(keywords[index], token))
return true;
}
return false;
}
int main(string[] args)
{
// need help?
if (args.length < 2 || args.length > 3)
{
printf("D to HTML converter\n"
"Usage: D2HTML <program>.d [<file>.htm]\n");
return 0;
}
// auto-name output file
if (args.length == 2)
args ~= args[1] ~ ".htm";
// load keywords
File kwd = new File("d2html.kwd");
while (!kwd.eof())
keywords ~= to!string(kwd.readLine());
kwd.close();
// open input and output files
File src = new File(args[1]), dst = new File;
dst.create(args[2]);
// write HTML header
dst.writeLine("<html><head><title>" ~ args[1] ~ "</title></head>");
dst.writeLine("<body color='#000000' bgcolor='#FFFFFF'><pre><code>");
// the main part is wrapped into try..catch block because
// when end of file is reached, an exception is raised;
// so we can omit any checks for EOF inside this block...
try
{
ulong linestart = 0; // for tabs
char c;
src.read(c);
while (true)
{
if (isspace(c)) // whitespace
{
do
{
if (c == 9)
{
// expand tabs to spaces
auto spaces = tabsize -
(src.position() - linestart) % tabsize;
for (int i = 0; i < spaces; i++)
dst.writeString(" ");
linestart = src.position() - tabsize + 1;
}
else
{
// reset line start on newline
if (c == 10 || c == 13)
linestart = src.position() + 1;
dst.write(c);
}
src.read(c);
} while (isspace(c));
}
else if (isalpha(c)) // keyword or identifier
{
string token;
do
{
token ~= c;
src.read(c);
} while (isalpha(c) || isdigit(c));
if (iskeyword(token)) // keyword
dst.writeString("<font color='#" ~ Colors.keyword ~
"'>" ~ token ~ "</font>");
else // simple identifier
dst.writeString(token);
}
else if (c == '0') // binary, octal or hexadecimal number
{
dst.writeString("<font color='#" ~ Colors.number ~ "008000'>");
dst.write(c);
src.read(c);
if (c == 'X' || c == 'x') // hexadecimal
{
dst.write(c);
src.read(c);
while (ishexdigit(c))
dst.write(c);
// TODO: add support for hexadecimal floats
}
else if (c == 'B' || c == 'b') // binary
{
dst.write(c);
src.read(c);
while (c == '0' || c == '1')
dst.write(c);
}
else // octal
{
do
{
dst.write(c);
src.read(c);
} while (isoctdigit(c));
}
dst.writeString("</font>");
}
else if (c == '#') // hash
{
dst.write(c);
src.read(c);
}
else if (c == '\\') // backward slash
{
dst.write(c);
src.read(c);
}
else if (isdigit(c)) // decimal number
{
dst.writeString("<font color='#" ~ Colors.number ~ "'>");
// integral part
do
{
dst.write(c);
src.read(c);
} while (isdigit(c));
// fractional part
if (c == '.')
{
dst.write(c);
src.read(c);
while (isdigit(c))
{
dst.write(c);
src.read(c);
}
}
// scientific notation
if (c == 'E' || c == 'e')
{
dst.write(c);
src.read(c);
if (c == '+' || c == '-')
{
dst.write(c);
src.read(c);
}
while (isdigit(c))
{
dst.write(c);
src.read(c);
}
}
// suffices
while (c == 'U' || c == 'u' || c == 'L' ||
c == 'l' || c == 'F' || c == 'f')
{
dst.write(c);
src.read(c);
}
dst.writeString("</font>");
}
else if (c == '\'') // string without escape sequences
{
dst.writeString("<font color='#" ~ Colors.astring ~ "'>");
do
{
if (c == '<') // special symbol in HTML
dst.writeString("<");
else
dst.write(c);
src.read(c);
} while (c != '\'');
dst.write(c);
src.read(c);
dst.writeString("</font>");
}
else if (c == 34) // string with escape sequences
{
dst.writeString("<font color='#" ~ Colors.astring ~ "'>");
char prev; // used to handle \" properly
do
{
if (c == '<') // special symbol in HTML
dst.writeString("<");
else
dst.write(c);
prev = c;
src.read(c);
} while (!(c == 34 && prev != '\\')); // handle \"
dst.write(c);
src.read(c);
dst.writeString("</font>");
}
else if (issymbol(c)) // either operator or comment
{
if (c == '<') // special symbol in HTML
{
dst.writeString("<");
src.read(c);
}
else if (c == '/') // could be a comment...
{
src.read(c);
if (c == '/') // single-line one
{
dst.writeString("<font color='#" ~ Colors.comment ~ "'>/");
while (c != 10)
{
if (c == '<') // special symbol in HTML
dst.writeString("<");
else if (c == 9)
{
// expand tabs
auto spaces2 = tabsize -
(src.position() - linestart) % tabsize;
for (int i2 = 0; i2 < spaces2; i2++)
dst.writeString(" ");
linestart = src.position() - tabsize + 1;
}
else
dst.write(c);
src.read(c);
}
dst.writeString("</font>");
}
else if (c == '*') // multi-line one
{
dst.writeString("<font color='#" ~ Colors.comment ~ "'>/");
char prev2;
do
{
if (c == '<') // special symbol in HTML
dst.writeString("<");
else if (c == 9)
{
// expand tabs
auto spaces3 = tabsize -
(src.position() - linestart) % tabsize;
for (int i3 = 0; i3 < spaces3; i3++)
dst.writeString(" ");
linestart = src.position() - tabsize + 1;
}
else
{
// reset line start on newline
if (c == 10 || c == 13)
linestart = src.position() + 1;
dst.write(c);
}
prev2 = c;
src.read(c);
} while (!(c == '/' && prev2 == '*'));
dst.write(c);
dst.writeString("</font>");
src.read(c);
}
else // just an operator
dst.write(cast(char) '/');
}
else // just an operator
{
dst.write(c);
src.read(c);
}
}
else
// whatever it is, it's not a valid D token
throw new Error("unrecognized token");
//~ break;
}
}
// if end of file is reached and we try to read something
// with typed read(), a ReadError is thrown; in our case,
// this means that job is successfully done
catch (Exception e)
{
// write HTML footer
dst.writeLine("</code></pre></body></html>");
}
return 0;
}