/// <summary>
/// Extract an integral number from 'src' (basically 'strtol')
/// Expects 'src' to point to a string of the following form:
/// [delim] [{+|–}][0[{x|X|b|B}]][digits]
/// The first character that does not fit this form stops the scan.
/// If 'radix' is between 2 and 36, then it is used as the base of the number.
/// If 'radix' is 0, the initial characters of the string are used to determine the base.
/// If the first character is 0 and the second character is not 'x' or 'X', the string is interpreted as an octal integer;
/// otherwise, it is interpreted as a decimal number. If the first character is '0' and the second character is 'x' or 'X',
/// the string is interpreted as a hexadecimal integer. If the first character is '1' through '9', the string is interpreted
/// as a decimal integer. The letters 'a' through 'z' (or 'A' through 'Z') are assigned the values 10 through 35; only letters
/// whose assigned values are less than 'radix' are permitted.</summary>
public static bool Int(out long intg, int radix, Src src, string?delim = null)
{
intg = 0;
if (!BufferNumber(src, ref radix, out var len, ENumType.Int, delim))
{
return(false);
}
try
{
var str = src.Buffer.ToString(0, len).ToLower();
str = str.TrimEnd('u', 'l');
if (radix == 2 && str.StartsWith("0b"))
{
str = str.Remove(0, 2);
}
if (radix == 8 && str.StartsWith("0o"))
{
str = str.Remove(0, 2);
}
if (radix == 16 && str.StartsWith("0x"))
{
str = str.Remove(0, 2);
}
intg = Convert.ToInt64(str, radix);
src += len;
return(true);
}
catch { return(false); }
}
/// <summary>
/// Construct a preprocessor macro of the form: 'TAG(p0,p1,..,pn)' expansion
/// from a stream of characters. Stops at the first non-escaped new line</summary>
public Macro(Src src, Loc loc)
: this(null, null, null, loc)
{
// Extract the tag and find it's hash code
m_tag = ReadTag(src, loc);
// Hash the tag
// m_hash = Hash(m_tag);
// Extract the optional parameters
if (src == '(')
{
ReadParams(src, m_params, loc, true);
}
// Trim whitespace from before the expansion text
for (; src != 0 && Str_.IsLineSpace(src); ++src)
{
}
// Extract the expansion and trim all leading and following whitespace
if (!Extract.Line(out var expansion, src, true))
{
throw new ScriptException(EResult.InvalidMacroDefinition, loc, "invalid macro expansion");
}
m_expansion = expansion.Trim();
}
/// <summary>Extract multi-part identifiers from 'src' incrementing 'src'. E.g. House.Room.Item</summary>
public static bool Identifiers(out string[] ids, Src src, char sep = '.', string?delim = null)
{
ids = Array.Empty <string>();
var idents = new List <string>();
for (; ;)
{
if (idents.Count != 0)
{
if (src == sep)
{
++src;
}
else
{
break;
}
}
if (!Identifier(out var id, src, delim))
{
return(false);
}
idents.Add(id);
}
ids = idents.ToArray();
return(true);
}
public Reader(Src src, bool case_sensitive = false, IIncludeHandler?inc = null, IMacroHandler?mac = null, EmbeddedCodeFactory?emb = null)
{
Src = new Preprocessor(src, inc, mac, emb);
Delimiters = " \t\r\n\v,;";
LastKeyword = string.Empty;
CaseSensitive = case_sensitive;
}
protected Src(Src wrapped)
{
m_src = wrapped;
m_loc = new Loc();
Buffer = new StringBuilder(256);
Limit = long.MaxValue;
}
/// <summary>
/// Extract a boolean from 'src'
/// Expects 'src' to point to a string of the following form:
/// [delim]{0|1|true|false}
/// The first character that does not fit this form stops the scan.
/// '0','1' must be followed by a non-identifier character
/// 'true', 'false' can have any case</summary>
public static bool Bool(out bool bool_, Src src, string?delim = null)
{
bool_ = false;
delim ??= DefaultDelimiters;
// Find the first non-delimiter
if (!AdvanceToNonDelim(src, delim))
{
return(false);
}
// Extract the boolean
switch (char.ToLower(src))
{
default: return(false);
case '0': bool_ = false; return(!Str_.IsIdentifier(++src, false));
case '1': bool_ = true; return(!Str_.IsIdentifier(++src, false));
case 't': bool_ = true; return(char.ToLower(++src) == 'r' && char.ToLower(++src) == 'u' && char.ToLower(++src) == 'e' && !Str_.IsIdentifier(++src, false));
case 'f': bool_ = false; return(char.ToLower(++src) == 'a' && char.ToLower(++src) == 'l' && char.ToLower(++src) == 's' && char.ToLower(++src) == 'e' && !Str_.IsIdentifier(++src, false));
}
}
/// <summary>Return a macro tag from 'src' (or fail)</summary>
private string ReadTag(Src src, Loc loc)
{
if (Extract.Identifier(out var tag, src))
{
return(tag);
}
throw new ScriptException(EResult.InvalidIdentifier, loc, "invalid macro name");
}
public TemplateReplacer(Src src, string pattern, SubstituteFunction subst, int chunk_size = 4096)
{
Src = new SrcStack(src);
Substitute = subst;
Pattern = new Regex(pattern);
ChunkSize = chunk_size;
OutputLocation = new Loc();
m_match_ofs = 0;
}
/// <summary>Push a script source onto the stack</summary>
public void Push(Src src)
{
// The stack takes ownership of 'src' and calls dispose on it when popped.
if (src == null)
{
throw new ArgumentNullException("src", "Null character source provided");
}
Stack.Push(src);
}
public static bool IntArray(out long[] intg, int count, int radix, Src src, string?delim = null)
{
intg = new long[count];
for (int i = 0; i != count; ++i)
{
if (!Int(out intg[i], radix, src, delim))
{
return(false);
}
}
return(true);
}
public static bool BoolArray(out bool[] bool_, int count, Src src, string?delim = null)
{
bool_ = new bool[count];
for (int i = 0; i != count; ++i)
{
if (!Bool(out bool_[i], src, delim))
{
return(false);
}
}
return(true);
}
/// <summary>Extract a contiguous block of characters up to (and possibly including) a new line character</summary>
public static bool Line(out string line, Src src, bool inc_cr, string?newline = null)
{
newline ??= "\n";
BufferWhile(src, (s, i) => !newline.Contains(s[i]) ? 1 : 0, 0, out var len);
if (inc_cr && src[len] != 0)
{
len += newline.Length; src.ReadAhead(len);
}
line = src.Buffer.ToString(0, len);
src += len;
return(true);
}
public static bool RealArray(out double[] real, int count, Src src, string?delim = null)
{
real = new double[count];
for (int i = 0; i != count; ++i)
{
if (!Real(out real[i], src, delim))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Reads the next character from the input stream. The returned value is
/// -1 if no further characters are available.</summary>
public override int Read()
{
var ch = Peek();
if (ch == -1)
{
return(-1);
}
Src.Next();
--m_match_ofs;
OutputLocation.inc((char)ch);
return(ch);
}
/// <summary>Extract a contiguous block of non-delimiter characters from 'src'</summary>
public static bool Token(out string token, Src src, string?delim = null)
{
token = string.Empty;
delim ??= DefaultDelimiters;
// Find the first non-delimiter
if (!AdvanceToNonDelim(src, delim))
{
return(false);
}
// Copy up to the next delimiter
BufferWhile(src, (s, i) => !delim.Contains(s[i]) ? 1 : 0, 0, out var len);
token = src.Buffer.ToString(0, len);
src += len;
return(true);
}
/// <summary>
/// Extract a floating point number from 'src'
/// Expects 'src' to point to a string of the following form:
/// [delim] [{+|-}][digits][.digits][{d|D|e|E}[{+|-}]digits]
/// The first character that does not fit this form stops the scan.
/// If no digits appear before the '.' character, at least one must appear after the '.' character.
/// The decimal digits can be followed by an exponent, which consists of an introductory letter (d, D, e, or E) and an optionally signed integer.
/// If neither an exponent part nor a '.' character appears, a '.' character is assumed to follow the last digit in the string.</summary>
public static bool Real(out double real, Src src, string?delim = null)
{
real = 0;
int radix = 10;
if (!BufferNumber(src, ref radix, out var len, ENumType.FP, delim))
{
return(false);
}
try
{
var str = src.Buffer.ToString(0, len).ToLower();
str = str.TrimEnd('f');
real = Convert.ToDouble(str);
src += len;
return(true);
}
catch { return(false); }
}
/// <summary>Extract a contiguous block of identifier characters from 'src' incrementing 'src'</summary>
public static bool Identifier(out string id, Src src, string?delim = null)
{
id = string.Empty;
delim ??= DefaultDelimiters;
// Find the first non-delimiter
if (!AdvanceToNonDelim(src, delim))
{
return(false);
}
// If the first non-delimiter is not a valid identifier character, then we can't extract an identifier
if (!Str_.IsIdentifier(src, true))
{
return(false);
}
// Copy up to the first non-identifier character
BufferWhile(src, (s, i) => Str_.IsIdentifier(s[i], false) ? 1 : 0, 1, out var len);
id = src.Buffer.ToString(0, len);
src += len;
return(true);
}
/// <summary>Expands template mark-up files</summary>
public static string Markup(Src src, string current_dir)
{
// Supported substitutions:
// <!--#include file="filepath"-->
// Substitutes the content of the file 'filepath' at the declared location.
// 'filepath' can be relative to directory of the template file, or a full path
// <!--#var name="count" file="filepath" value="const int Count = (?<value>\d+);"-->
// Declares a variable for later use. Applies a regex match to the contents of 'filepath' to get a definition for 'value'
// 'filepath' can be relative to directory of the template file, or a full path
// <!--#value name="count"-->
// Substitute a previously defined variable called 'count'
// <!--#image file="filepath"-->
// Substitute a base64 image file 'filepath'
var variables = new Dictionary <string, string>();
// General form: [optional leading whitespace]<!--#command key="value" key="value"... -->
// The pattern matches leading white space which is then inserted before every line in the substituted result.
// This means includes on lines of the own are correctly tabbed, and <!--inline--> substitutions are also correct
var result = TemplateReplacer.Process(src, @"(?<indent>[ \t]*)<!--#(?<cmd>\w+)\s+(?<kv>.*?)-->", (tr, match) =>
{
var indent = match.Result("${indent}");
var cmd = match.Result("${cmd}");
var kv = match.Result("${kv}"); // list of key="value" pairs
Match m;
switch (cmd)
{
default:
{
throw new Exception(string.Format("Unknown template command: '{0}' ({1})", cmd, match.ToString()));
}
case "include":
#region include
{
const string expected_form = "<!--#include file=\"filepath\"-->";
// Read the include filepath and check it exists
m = Regex.Match(kv, @".*file=""(?<file>.*?)"".*");
if (!m.Success)
{
throw new Exception(string.Format("Invalid include: '{0}'.\nCould not match 'file' field.\nExpected form: {1}", match.ToString(), expected_form));
}
var fpath = m.Result("${file}");
fpath = Path.IsPathRooted(fpath) ? fpath : Path.Combine(current_dir, fpath);
if (!File.Exists(fpath))
{
throw new FileNotFoundException(string.Format("File reference not found: {0}", fpath), fpath);
}
tr.PushSource(new AddIndents(new FileSrc(fpath), indent, true));
return(string.Empty);
}
#endregion
case "var":
#region var
{
const string expected_form = "<!--#var name=\"variable_name\" file=\"filepath\" value=\"regex_pattern_defining_value\"-->";
// Read the name of the variable
m = Regex.Match(kv, @".*name=""(?<name>\w+)"".*");
if (!m.Success)
{
throw new Exception(string.Format("Invalid variable declaration: '{0}'.\nCould not match 'name' field.\nExpected form: {1}", match.ToString(), expected_form));
}
var name = m.Result("${name}");
// Read the source filepath
m = Regex.Match(kv, @".*file=""(?<file>.*?)"".*");
if (!m.Success)
{
throw new Exception(string.Format("Invalid variable declaration: '{0}'.\nCould not match 'file' field.\nExpected form: {1}", match.ToString(), expected_form));
}
var filepath = m.Result("${file}");
filepath = Path.IsPathRooted(filepath) ? filepath : Path.Combine(current_dir, filepath);
if (!File.Exists(filepath))
{
throw new FileNotFoundException(string.Format("File reference not found: {0}", filepath), filepath);
}
// Read the regex pattern that defines 'value'
m = Regex.Match(kv, @".*value=""(?<pattern>.*?)"".*");
if (!m.Success)
{
throw new Exception(string.Format("Invalid variable declaration: '{0}'.\nCould not match 'value' field.\nExpected form: {1}", match.ToString(), expected_form));
}
var pat = m.Result("${pattern}");
Regex pattern;
try { pattern = new Regex(pat, RegexOptions.Compiled); }
catch (Exception ex) { throw new Exception(string.Format("Invalid variable declaration: '{0}'.\n'value' field is not a valid Regex expression.\nExpected form: {1}", match.ToString(), expected_form), ex); }
// Use the pattern to get the value for the variable
using (var sr = new StreamReader(filepath, Encoding.UTF8, true, 65536))
for (string?line; (line = sr.ReadLine()) != null && !(m = pattern.Match(line)).Success;)
{
}
if (!m.Success)
{
throw new Exception(string.Format("Invalid variable declaration: '{0}'.\n'value' regex expression did not find a match in {2}.\nExpected form: {1}", match.ToString(), expected_form, filepath));
}
var value = m.Result("${value}");
// Save the name/value pair
variables[name] = value;
return(string.Empty);
}
#endregion
case "value":
#region value
{
const string expected_form = "<!--#value name=\"variable_name\"-->";
// Read the name of the variable
m = Regex.Match(kv, @".*name=""(?<name>\w+)"".*");
if (!m.Success)
{
throw new Exception(string.Format("Invalid value declaration: '{0}'.\nCould not match 'name' field.\nExpected form: {1}", match.ToString(), expected_form));
}
var name = m.Result("${name}");
// Lookup the value for the variable
if (!variables.TryGetValue(name, out var value))
{
throw new Exception(string.Format("Invalid value declaration: '{0}'.\nVariable with 'name' {2} is not defined.\nExpected form: {1}", match.ToString(), expected_form, name));
}
return(indent + value);
}
#endregion
case "image":
#region image
{
const string expected_form = "<!--#image file=\"filepath\"-->";
// Read the filename
m = Regex.Match(kv, @".*file=""(?<file>.*?)"".*");
if (!m.Success)
{
throw new Exception(string.Format("Invalid image declaration: '{0}'.\nCould not match 'file' field.\nExpected form: {1}", match.ToString(), expected_form));
}
var fpath = m.Result("${file}");
fpath = Path.IsPathRooted(fpath) ? fpath : Path.Combine(current_dir, fpath);
if (!File.Exists(fpath))
{
throw new FileNotFoundException(string.Format("File reference not found: {0}", fpath), fpath);
}
// Determine the image type
var extn = (Path.GetExtension(fpath) ?? string.Empty).ToLowerInvariant();
if (string.IsNullOrEmpty(extn))
{
throw new Exception(string.Format("Could not determine image file format from path '{0}'", fpath));
}
// Read the image file
var img = File.ReadAllBytes(fpath);
switch (extn)
{
default: throw new Exception(string.Format("Unsupported image format: {0}", extn));
case ".png": return(string.Format("data:image/png;base64,{0}", Convert.ToBase64String(img)));
case ".jpg": return(string.Format("data:image/jpg;base64,{0}", Convert.ToBase64String(img)));
}
}
#endregion
}
});
return(result);
}
/// <summary>Process a string template</summary>
public static string Process(Src template, string pattern, SubstituteFunction subst, int chunk_size = 4096)
{
using var tr = new TemplateReplacer(template, pattern, subst, chunk_size);
return(tr.ReadToEnd());
}
/// <summary>
/// Extract a quoted (") string.
/// if 'escape' is not 0, it is treated as the escape character
/// if 'quote' is not null, it is treated as the accepted quote characters</summary>
public static bool String(out string str, Src src, string?delim = null)
{
return(String(out str, src, '\0', null, delim));
}
protected virtual void Dispose(bool _)
{
Src.Dispose();
}
/// <summary>
/// Extract a number of unknown format from 'src'
/// Expects 'src' to point to a string containing any allowable number format (int or real).</summary>
public static bool Number <Num>(out Num num, Src src, int radix = 0, string?delim = null)
where Num : struct
{
num = default !;
public Preprocessor(Src src, IIncludeHandler?inc = null, IMacroHandler?mac = null, EmbeddedCodeFactory?emb = null)
: this(inc, mac, emb)
{
Stack.Push(src);
}
public StripComments(Src src, InLiteral.EFlags literal_flags = InLiteral.EFlags.Escaped | InLiteral.EFlags.SingleLineStrings, InComment.Patterns?comment_patterns = null)
: base(src)
{
m_com = new InComment(comment_patterns ?? new InComment.Patterns(), literal_flags);
}
/// <summary>Expands template html files</summary> public static string Html(Src src, string current_dir) => Markup(src, current_dir);
protected override void Dispose(bool disposing)
{
Src.Dispose();
base.Dispose(disposing);
}
public static bool String(out string str, Src src, char escape, string?quotes = null, string?delim = null)
{
str = string.Empty;
delim ??= DefaultDelimiters;
// Set the accepted quote characters
quotes ??= "\"\'";
// Find the first non-delimiter
if (!AdvanceToNonDelim(src, delim))
{
return(false);
}
// If the next character is not an acceptable quote, then this isn't a string
char quote = src;
if (quotes.Contains(quote))
{
++src;
}
else
{
return(false);
}
// Copy the string
var sb = new StringBuilder();
if (escape != 0)
{
// Copy to the closing quote, allowing for the escape character
for (; src != 0 && src != quote; ++src)
{
if (src == escape)
{
switch (++src)
{
default: break;
case 'a': sb.Append('\a'); break;
case 'b': sb.Append('\b'); break;
case 'f': sb.Append('\f'); break;
case 'n': sb.Append('\n'); break;
case 'r': sb.Append('\r'); break;
case 't': sb.Append('\t'); break;
case 'v': sb.Append('\v'); break;
case '\'': sb.Append('\''); break;
case '\"': sb.Append('\"'); break;
case '\\': sb.Append('\\'); break;
case '0':
case '1':
case '2':
case '3':
{
// ASCII character in octal
var oct = new char[8]; var i = 0;
for (; i != oct.Length && Str_.IsOctDigit(src); ++i, ++src)
{
oct[i] = src;
}
sb.Append((char)Convert.ToInt32(new string(oct, 0, i), 8));
break;
}
case 'x':
{
// ASCII or UNICODE character in hex
var hex = new char[8]; var i = 0;
for (; i != hex.Length && Str_.IsHexDigit(src); ++i, ++src)
{
hex[i] = src;
}
sb.Append((char)Convert.ToInt32(new string(hex, 0, i), 16));
break;
}
}
}
else
{
sb.Append(src);
}
}
}
else
{
// Copy to the next quote
for (; src != 0 && src != quote; ++src)
{
sb.Append(src);
}
}
// If the string doesn't end with a quote, then it's not a valid string
if (src == quote)
{
++src;
}
else
{
return(false);
}
str = sb.ToString();
return(true);
}
/// <summary>Push a new stream onto the source stack</summary>
public void PushSource(Src src)
{
Src.Push(src);
}
/// <summary>
/// Extract a comma separated parameter list of the form '(p0,p1,..,pn)'
/// If 'identifiers' is true then the parameters are expected to be identifiers.
/// If not, then anything delimited by commas is accepted. 'identifiers' == true is used when
/// reading the definition of the macro, 'identifiers' == false is used when expanding an instance.
/// If an empty parameter list is given, i.e. "()" then 'args' is returned containing one blank parameter.
/// Returns true if the macro does not take parameters or the correct number of parameters where given,
/// false if the macro takes parameters but none were given. Basically, 'false' means, don't treat
/// this macro as matching because no params were given. If false is returned the buffer will
/// contain anything read during this method.</summary>
private bool ReadParams(Src buf, List <string> args, Loc location, bool identifiers)
{
// Buffer up to the first non-whitespace character
// If no parameters are given, then the macro doesn't match
if (!identifiers && args.Count != 0)
{
int i = 0; for (; Str_.IsWhiteSpace(buf[i]); ++i)
{
}
if (buf[i] != '(')
{
return(false);
}
buf += i;
}
// If we're not reading the parameter names for a macro definition
// and the macro takes no parameters, then ReadParams is a no-op
if (!identifiers && m_params.Count == 0)
{
return(true);
}
// Capture the strings between commas as the parameters
for (++buf; buf != ')'; buf += buf != ')' ? 1 : 0)
{
// Read parameter names for a macro definition
if (identifiers)
{
if (!Extract.Identifier(out var arg, buf))
{
throw new ScriptException(EResult.InvalidIdentifier, location, "invalid macro identifier");
}
args.Add(arg);
}
// Read parameters being passed to the macro
else
{
var arg = new StringBuilder();
for (int nest = 0; (buf != ',' && buf != ')') || nest != 0; ++buf)
{
if (buf == 0)
{
throw new ScriptException(EResult.UnexpectedEndOfFile, location, "macro parameter list incomplete");
}
arg.Append(buf);
nest += buf == '(' ? 1 : 0;
nest -= buf == ')' ? 1 : 0;
}
args.Add(arg.ToString());
}
}
++buf; // Skip over the ')'
// Add a blank argument to distinguish between "TAG()" and "TAG"
if (args.Count == 0)
{
args.Add(string.Empty);
}
// Check enough parameters have been given
if (!identifiers && m_params.Count != args.Count)
{
throw new ScriptException(EResult.ParameterCountMismatch, location, "incorrect number of macro parameters");
}
return(true);
}
