Task 149: .DOT File Format
Task 149: .DOT File Format
1. List of All Properties of the .DOT File Format Intrinsic to Its File System
The .DOT file format refers to the Graphviz DOT language, a text-based format for describing graphs. It has no binary header or file system-specific metadata beyond standard file attributes (e.g., size, timestamps), as it is a plain text format. The intrinsic properties are the attributes that can be defined within the file for graphs, clusters, nodes, edges, and subgraphs. These attributes control the graph's structure, appearance, and layout. Below is a categorized list of all possible attributes, compiled from the format specification.
Graph Attributes (G): _background, area, bb, beautify, bgcolor, center, charset, class, clusterrank, colorscheme, comment, compound, concentrate, Damping, defaultdist, dim, dimen, diredgeconstraints, dpi, epsilon, esep, fontcolor, fontname, fontnames, fontpath, fontsize, forcelabels, gradientangle, imagepath, inputscale, K, label, label_scheme, labeljust, labelloc, landscape, layer, layerlistsep, layers, layerselect, layersep, layout, levels, levelsgap, linelength, lp, margin, maxiter, mclimit, mindist, mode, model, newrank, nodesep, nojustify, normalize, notranslate, nslimit, nslimit1, oneblock, outputorder, overlap, overlap_scaling, overlap_shrink, pack, packmode, pad, page, pagedir, quantum, rankdir, ranksep, ratio, remincross, repulsiveforce, resolution, rotate, rotation, scale, searchsize, sep, size, smoothing, splines, start, stylesheet, TBbalance, truecolor, viewport, voro_margin, xdotversion.
Cluster Attributes (C): area, bb, bgcolor, class, cluster, colorscheme, color, comment, fillcolor, fontcolor, fontname, fontsize, gradientangle, id, label, labeljust, labelloc, layer, lheight, lp, lwidth, margin, nojustify, pencolor, penwidth, peripheries, sortv, style, target, tooltip, URL.
Node Attributes (N): area, class, color, colorscheme, comment, distortion, fillcolor, fixedsize, fontcolor, fontname, fontsize, gradientangle, group, height, id, image, imagepath, imagepos, imagescale, K, label, labelloc, layer, margin, nojustify, ordering, orientation, penwidth, peripheries, pin, pos, regular, rects, root, samplepoints, shape, shapefile, showboxes, sides, skew, sortv, style, target, tooltip, URL, vertices, width, xlabel, xlp, z.
Edge Attributes (E): arrowhead, arrowsize, arrowtail, class, color, colorscheme, comment, constraint, decorate, edgehref, edgetarget, edgetooltip, edgeURL, fillcolor, fontcolor, fontname, fontsize, head_lp, headclip, headhref, headlabel, headport, headtarget, headtooltip, headURL, id, label, labelangle, labeldistance, labelfloat, labelfontcolor, labelfontname, labelfontsize, labelhref, labeltarget, labeltooltip, labelURL, layer, len, lhead, lp, ltail, minlen, nojustify, penwidth, pos, samehead, sametail, style, tail_lp, tailclip, tailhref, taillabel, tailport, tailtarget, tailtooltip, tailURL, target, tooltip, URL, weight, xlabel, xlp.
Subgraph Attributes (S): cluster, rank.
These attributes represent the core elements that define the format's structure and content.
2. Two Direct Download Links for .DOT Files
- https://graphviz.org/Gallery/directed/hello.gv.txt (A simple "Hello World" graph example in DOT format; save as .dot if needed).
- https://graphviz.org/Gallery/directed/cluster.gv.txt (An example demonstrating clusters in DOT format; save as .dot if needed).
3. Ghost Blog Embedded HTML JavaScript for Drag-and-Drop .DOT File Processing
The following is an HTML snippet with embedded JavaScript that can be inserted into a Ghost blog post. It allows users to drag and drop a .DOT file, parses the file to extract all attribute properties (as key-value pairs), and displays them on the screen.
This code uses a regular expression to extract attribute key-value pairs from the file content and displays them in a list.
4. Python Class for .DOT File Processing
The following Python class opens a .DOT file, decodes it to extract properties (attributes), allows reading and writing the file, and prints the properties to the console.
import re
class DotFile:
def __init__(self, filename):
with open(filename, 'r') as f:
self.content = f.read()
self.properties = self.decode()
def decode(self):
props = {}
matches = re.finditer(r'(\w+)\s*=\s*(".*?"|[^;,\s\]]+)', self.content)
for match in matches:
key = match.group(1).strip()
value = match.group(2).strip().replace('"', '')
props[key] = value
return props
def read(self):
return self.properties
def print_properties(self):
for key, value in self.properties.items():
print(f"{key}: {value}")
def set_property(self, key, value):
# Simple append if not present; for full write, reconstruct if needed
if key not in self.properties:
self.content += f'\n{key} = "{value}";'
else:
self.content = re.sub(f'{key}\\s*=\\s*(".*?"|[^;]+)', f'{key} = "{value}"', self.content)
self.properties[key] = value
def write(self, filename):
with open(filename, 'w') as f:
f.write(self.content)
5. Java Class for .DOT File Processing
The following Java class opens a .DOT file, decodes it to extract properties, allows reading and writing the file, and prints the properties to the console.
import java.io.*;
import java.util.*;
import java.util.regex.*;
public class DotFile {
private String content;
private Map<String, String> properties;
public DotFile(String filename) throws IOException {
BufferedReader reader = new BufferedReader(new FileReader(filename));
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
reader.close();
content = sb.toString();
properties = decode();
}
private Map<String, String> decode() {
Map<String, String> props = new HashMap<>();
Pattern pattern = Pattern.compile("(\\w+)\\s*=\\s*(\".*?\"|[^;,\\s\\]]+)");
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
String key = matcher.group(1).trim();
String value = matcher.group(2).trim().replace("\"", "");
props.put(key, value);
}
return props;
}
public Map<String, String> read() {
return properties;
}
public void printProperties() {
for (Map.Entry<String, String> entry : properties.entrySet()) {
System.out.println(entry.getKey() + ": " + entry.getValue());
}
}
public void setProperty(String key, String value) {
if (!properties.containsKey(key)) {
content += "\n" + key + " = \"" + value + "\";";
} else {
content = content.replaceAll(key + "\\s*=\\s*(\".*?\"|[^;]+)", key + " = \"" + value + "\"");
}
properties.put(key, value);
}
public void write(String filename) throws IOException {
BufferedWriter writer = new BufferedWriter(new FileWriter(filename));
writer.write(content);
writer.close();
}
}
6. JavaScript Class for .DOT File Processing
The following JavaScript class opens a .DOT file (using Node.js for file I/O), decodes it to extract properties, allows reading and writing the file, and prints the properties to the console.
const fs = require('fs');
class DotFile {
constructor(filename) {
this.content = fs.readFileSync(filename, 'utf8');
this.properties = this.decode();
}
decode() {
const props = {};
const regex = /(\w+)\s*=\s*(".*?"|[^;,\s\]]+)/g;
let match;
while ((match = regex.exec(this.content)) !== null) {
const key = match[1].trim();
const value = match[2].trim().replace(/"/g, '');
props[key] = value;
}
return props;
}
read() {
return this.properties;
}
printProperties() {
for (const [key, value] of Object.entries(this.properties)) {
console.log(`${key}: ${value}`);
}
}
setProperty(key, value) {
if (!(key in this.properties)) {
this.content += `\n${key} = "${value}";`;
} else {
this.content = this.content.replace(new RegExp(`${key}\\s*=\\s*(".*?"|[^;]+)`, 'g'), `${key} = "${value}"`);
}
this.properties[key] = value;
}
write(filename) {
fs.writeFileSync(filename, this.content, 'utf8');
}
}
7. C++ Class for .DOT File Processing
The following C++ class opens a .DOT file, decodes it to extract properties, allows reading and writing the file, and prints the properties to the console.
#include <iostream>
#include <fstream>
#include <string>
#include <map>
#include <regex>
class DotFile {
private:
std::string content;
std::map<std::string, std::string> properties;
public:
DotFile(const std::string& filename) {
std::ifstream file(filename);
if (file.is_open()) {
std::string line;
while (std::getline(file, line)) {
content += line + "\n";
}
file.close();
decode();
}
}
void decode() {
std::regex regex(R"((\w+)\s*=\s*(".*?"|[^;,\s\]]+))");
std::sregex_iterator iter(content.begin(), content.end(), regex);
std::sregex_iterator end;
for (; iter != end; ++iter) {
std::string key = iter->str(1);
std::string value = iter->str(2);
value.erase(std::remove(value.begin(), value.end(), '"'), value.end());
properties[key] = value;
}
}
std::map<std::string, std::string> read() {
return properties;
}
void printProperties() {
for (const auto& pair : properties) {
std::cout << pair.first << ": " << pair.second << std::endl;
}
}
void setProperty(const std::string& key, const std::string& value) {
if (properties.find(key) == properties.end()) {
content += "\n" + key + " = \"" + value + "\";";
} else {
std::regex replace_regex(key + R"(\s*=\s*(".*?"|[^;]+))");
content = std::regex_replace(content, replace_regex, key + " = \"" + value + "\"");
}
properties[key] = value;
}
void write(const std::string& filename) {
std::ofstream file(filename);
if (file.is_open()) {
file << content;
file.close();
}
}
};