EPL Standard Library Reference¶

EPL v7.0.0 — 725 Python-backed functions plus native EPL stdlib modules

Categories¶

I/O & Display¶

Function	Description
`Print <expr>`	Display a value to stdout
`Display <expr>`	Alias for Print
`read_input(prompt)`	Read user input
`print_error(msg)`	Print to stderr

Math (built-in)¶

Function	Description
`round(n)`	Round to nearest integer
`floor(n)`	Round down
`ceil(n)`	Round up
`absolute(n)`	Absolute value
`power(base, exp)`	Exponentiation
`sqrt(n)`	Square root
`max(a, b)`	Maximum
`min(a, b)`	Minimum
`random()`	Random float 0-1
`random_integer(min, max)`	Random integer in range
`log(n)`	Natural logarithm
`sin(n)`, `cos(n)`, `tan(n)`	Trigonometric functions
`asin(n)`, `acos(n)`, `atan(n)`	Inverse trig
`atan2(y, x)`	Two-argument arctangent
`degrees(rad)`, `radians(deg)`	Angle conversion
`gcd(a, b)`, `lcm(a, b)`	Greatest common divisor, least common multiple
`factorial(n)`	Factorial
`clamp(val, lo, hi)`	Clamp value to range
`lerp(a, b, t)`	Linear interpolation
`sign(n)`	Sign (-1, 0, 1)
`pi`, `euler`, `inf`, `nan`	Math constants
`is_finite(n)`, `is_nan(n)`	Number type checks

String Functions¶

Function	Description
`length(s)`	String/list length
`uppercase(s)`	Convert to uppercase
`lowercase(s)`	Convert to lowercase
`trim(s)`	Remove leading/trailing whitespace
`contains(s, sub)`	Check if contains substring
`replace(s, old, new)`	Replace occurrences
`split(s, delim)`	Split string into list
`join(list, delim)`	Join list into string
`substring(s, start, end)`	Extract substring
`starts_with(s, prefix)`	Check prefix
`ends_with(s, suffix)`	Check suffix
`index_of(s, sub)`	Find position
`char_code(s)`	Get character code
`from_char_code(n)`	Character from code
`format(template, ...)`	String formatting
`regex_escape(s)`	Escape regex special chars

Type Conversion¶

Function	Description
`to_integer(val)`	Convert to integer
`to_text(val)`	Convert to string
`to_decimal(val)`	Convert to float
`type_of(val)`	Get type name as string

List Functions¶

Method	Description
`list.add(item)`	Append item
`list.push(item)`	Alias for add
`list.remove(index)`	Remove at index
`list.contains(item)`	Check membership
`list.reverse()`	Reverse in place
`list.sort()`	Sort in place
`sort(list)`	Return sorted copy
`reverse(list)`	Return reversed copy
`unique(list)`	Remove duplicates
`sum(list)`	Sum numeric list
`zip_lists(a, b)`	Zip two lists
`enumerate_list(list)`	List of [index, value] pairs
`dict_from_lists(keys, vals)`	Create map from parallel lists

Map Functions¶

Function	Description
`map.keys()`	Get all keys
`map.values()`	Get all values
`map.has(key)`	Check if key exists

Set Functions¶

Function	Description
`set_create()`	Create empty set
`set_add(set, item)`	Add to set
`set_remove(set, item)`	Remove from set
`set_contains(set, item)`	Check membership
`set_union(a, b)`	Union of sets
`set_intersection(a, b)`	Intersection
`set_difference(a, b)`	Difference

JSON¶

Function	Description
`json_parse(str)`	Parse JSON string to value
`json_stringify(val)`	Convert value to JSON string
`json_pretty(val)`	Pretty-print JSON

HTTP / Networking¶

Function	Description
`http_get(url)`	HTTP GET request
`http_post(url, data)`	HTTP POST request
`http_put(url, data)`	HTTP PUT request
`http_delete(url)`	HTTP DELETE request
`url_encode(s)`, `url_decode(s)`	URL encoding
`dns_lookup(host)`	DNS resolution
`is_port_open(host, port)`	Check port availability

File System¶

Function	Description
`file_read(path)`	Read file contents
`file_write(path, data)`	Write to file
`file_append(path, data)`	Append to file
`file_exists(path)`	Check if file exists
`file_delete(path)`	Delete file
`file_rename(old, new)`	Rename file
`file_copy(src, dst)`	Copy file
`file_size(path)`	Get file size
`file_read_lines(path)`	Read as list of lines
`dir_list(path)`	List directory contents
`dir_create(path)`	Create directory
`dir_delete(path)`	Delete directory
`dir_exists(path)`	Check directory exists
`path_join(a, b)`	Join path components
`path_basename(p)`	Get filename
`path_dirname(p)`	Get directory
`path_extension(p)`	Get file extension
`temp_file()`, `temp_dir()`	Create temporary file/directory

Database¶

Function	Description
`db_open(path)`	Open SQLite database
`db_close()`	Close database
`db_execute(sql, params)`	Execute SQL
`db_query(sql, params)`	Query, return all rows
`db_query_one(sql, params)`	Query, return first row
`db_insert(table, data)`	Insert record
`db_create_table(name, cols)`	Create table

Date & Time¶

Function	Description
`now()`	Current datetime string
`today()`	Current date string
`sleep(seconds)`	Pause execution
`timestamp()`	Unix timestamp
`date_format(date, fmt)`	Format date
`date_parse(str, fmt)`	Parse date string
`date_diff(a, b, unit)`	Difference between dates
`year(d)`, `month(d)`, `day(d)`	Extract date parts
`hour(d)`, `minute(d)`, `second(d)`	Extract time parts
`day_of_week(d)`	Day of week (0=Monday)
`is_leap_year(y)`	Check leap year

Regex¶

Function	Description
`regex_match(pattern, str)`	Match regex at start
`regex_find(pattern, str)`	Find first match
`regex_find_all(pattern, str)`	Find all matches
`regex_replace(pattern, repl, str)`	Replace matches
`regex_split(pattern, str)`	Split by pattern
`regex_test(pattern, str)`	Test if matches

Cryptography & Encoding¶

Function	Description
`hash_md5(s)`	MD5 hash
`hash_sha256(s)`	SHA-256 hash
`hash_sha512(s)`	SHA-512 hash
`base64_encode(s)`	Base64 encode
`base64_decode(s)`	Base64 decode
`uuid()`, `uuid4()`	Generate UUID
`hex_encode(s)`, `hex_decode(s)`	Hex encoding

OS & System¶

Function	Description
`exec(cmd)`	Execute shell command
`exec_output(cmd)`	Execute and capture output
`env_get(key)`	Get environment variable
`env_set(key, val)`	Set environment variable
`platform()`	OS name
`cpu_count()`	Number of CPUs
`memory_usage()`	Memory usage in bytes
`cwd()`	Current working directory
`chdir(path)`	Change directory
`pid()`	Process ID
`args()`	Command-line arguments
`timer_start()`, `timer_stop()`	Performance timing

CSV¶

Function	Description
`csv_read(path)`	Read CSV file
`csv_write(path, data)`	Write CSV file
`csv_parse(text)`	Parse CSV string

Concurrency¶

Function	Description
`mutex_create()`	Create mutex lock
`mutex_lock(m)`, `mutex_unlock(m)`	Lock/unlock
`channel_create(size)`	Create buffered channel
`channel_send(ch, val)`	Send to channel
`channel_receive(ch)`	Receive from channel
`semaphore_create(n)`	Create semaphore
`parallel_map(fn, list)`	Map in parallel
`thread_pool_create(n)`	Create thread pool

ORM (Object-Relational Mapping)¶

Function	Description
`orm_open(path)`	Open ORM database
`orm_define_model(name)`	Define a model
`orm_add_field(model, name, type)`	Add field
`orm_migrate()`	Run migrations
`orm_create(model, data)`	Create record
`orm_find(model, query)`	Find records
`orm_update(model, id, data)`	Update record
`orm_delete(model, id)`	Delete record

Security Note¶

When running with --sandbox flag, the following functions are disabled: exec, exec_output, file_write, file_delete, file_append, dir_delete, dir_create, chdir, env_set, env_get, download, http_get, http_post

This prevents untrusted EPL code from modifying the filesystem or making network requests.