How to Create HTML Syntax Highlighter ?
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How to Create HTML Syntax Highlighter ?
syntax error highlighter is a complex task that depends on the programming language you want to support. However, I can provide you with a simple Python syntax error highlighter as an example. This highlighter will check for basic syntax errors using the ast module. Keep in mind that this is a basic example and may not cover all possible cases or complexities of real-world programming languages.
Here is the code sample to create HTML Syntax Highlighter:
<script type='text/javascript'>
import ast
import builtins
def highlight_syntax_errors(code):
try:
ast.parse(code, mode='exec')
return "No syntax errors found."
except SyntaxError as e:
error_message = f"SyntaxError: {e.msg} (Line {e.lineno}, Column {e.offset})"
return highlight_error_in_code(code, e.lineno, e.offset, error_message)
def highlight_error_in_code(code, lineno, offset, error_message):
lines = code.split('\n')
error_line = lines[lineno - 1]
caret_position = ' ' * (offset - 1) + '^'
highlighted_code = "\n".join(lines[:lineno - 1] + [error_line + "\n" + caret_position] + lines[lineno:])
return f"{error_message}\n\nHighlighted code:\n{highlighted_code}"
if __name__ == "__main__":
code = """
def greet(name)
print("Hello, " + name)
"""
result = highlight_syntax_errors(code)
print(result)
</script>
Or,
<script type='text/javascript'>
//<![CDATA[
import code
def highlight_syntax_errors(code_str):
try:
code.compile_command(code_str, "<string>", "exec")
return "No syntax errors found."
except SyntaxError as e:
error_message = f"SyntaxError: {e.msg} (Line {e.lineno}, Column {e.offset})"
return highlight_error_in_code(code_str, e.lineno, e.offset, error_message)
def highlight_error_in_code(code_str, lineno, offset, error_message):
lines = code_str.split('\n')
error_line = lines[lineno - 1]
caret_position = ' ' * (offset - 1) + '^'
highlighted_code = "\n".join(lines[:lineno - 1] + [error_line + "\n" + caret_position] + lines[lineno:])
return f"{error_message}\n\nHighlighted code:\n{highlighted_code}"
if __name__ == "__main__":
code_str = """
def greet(name)
print("Hello, " + name)
"""
result = highlight_syntax_errors(code_str)
print(result)
//]]>
</script>
In this example, the highlight_syntax_errors function takes a string code as input, attempts to parse it using ast.parse, and returns either "No syntax errors found" or a formatted error message indicating the location of the syntax error in the code along with the highlighted code snippet.
Another way to Highlight Syntax error with display:
<head>
<title>Syntax Error Highlighter</title>
<style>
.highlight {
background-color: #ffcccc;
}
</style>
</head>
<body>
<textarea id="code" rows="10" cols="80"></textarea>
<button onclick="highlightSyntaxErrors()">Highlight Syntax Errors</button>
<pre id="highlightedCode"></pre>
<script>
function highlightSyntaxErrors() {
const codeTextarea = document.getElementById('code');
const code = codeTextarea.value;
const highlightedCodeElement = document.getElementById('highlightedCode');
try {
// Try to parse the code to detect syntax errors
new Function(code);
// If no syntax errors, display the code without highlights
highlightedCodeElement.innerText = code;
} catch (error) {
// If syntax error found, display the error and highlight the code
const errorLine = error.lineNumber - 1;
const errorOffset = error.columnNumber - 1;
const lines = code.split('\n');
const highlightedLines = lines.map((line, index) => {
return index === errorLine ? '<span class="highlight">' + line + '</span>' : line;
});
highlightedCodeElement.innerHTML = highlightedLines.join('\n');
}
}
</script>
</body>
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