Warning
This document is for an old release of Galaxy. You can alternatively view this page in the latest release if it exists or view the top of the latest release's documentation.
Source code for galaxy.managers.markdown_parse
"""Utilities for parsing "Galaxy Flavored Markdown".
See markdown_util.py for loading objects and interacting with the rest of Galaxy.
This file is meant to be relatively self contained and just used to "parse" and validate
Galaxy Markdown. Keeping things isolated to allow re-use of these utilities in other
projects (e.g. gxformat2).
"""
import re
BLOCK_FENCE_START = re.compile(r'```.*')
BLOCK_FENCE_END = re.compile(r'```[\s]*')
GALAXY_FLAVORED_MARKDOWN_CONTAINER_LINE_PATTERN = re.compile(
r"```\s*galaxy\s*"
)
VALID_CONTAINER_END_PATTERN = re.compile(r"^```\s*$")
DYNAMIC_ARGUMENTS = object()
VALID_ARGUMENTS = {
"history_link": ["history_id"],
"history_dataset_display": ["input", "output", "history_dataset_id"],
"history_dataset_embedded": ["input", "output", "history_dataset_id"],
"history_dataset_as_image": ["input", "output", "history_dataset_id", "path"],
"history_dataset_peek": ["input", "output", "history_dataset_id"],
"history_dataset_info": ["input", "output", "history_dataset_id"],
"history_dataset_link": ["input", "output", "history_dataset_id", "path", "label"],
"history_dataset_index": ["input", "output", "history_dataset_id", "path"],
"history_dataset_name": ["input", "output", "history_dataset_id"],
"history_dataset_type": ["input", "output", "history_dataset_id"],
"history_dataset_collection_display": ["input", "output", "history_dataset_collection_id"],
"workflow_display": ["workflow_id"],
"job_metrics": ["step", "job_id"],
"job_parameters": ["step", "job_id"],
"tool_stderr": ["step", "job_id"],
"tool_stdout": ["step", "job_id"],
"generate_galaxy_version": [],
"generate_time": [],
"visualization": DYNAMIC_ARGUMENTS,
# Invocation Flavored Markdown
"invocation_time": ["invocation_id"],
"invocation_outputs": [],
"invocation_inputs": [],
}
GALAXY_FLAVORED_MARKDOWN_CONTAINERS = list(VALID_ARGUMENTS.keys())
GALAXY_FLAVORED_MARKDOWN_CONTAINER_REGEX = r'(?P<container>%s)' % "|".join(GALAXY_FLAVORED_MARKDOWN_CONTAINERS)
ARG_VAL_REGEX = r'''[\w_\-]+|\"[^\"]+\"|\'[^\']+\''''
FUNCTION_ARG = r'\s*[\w\|]+\s*=\s*(?:%s)\s*' % ARG_VAL_REGEX
# embed commas between arguments
FUNCTION_MULTIPLE_ARGS = fr'(?P<firstargcall>{FUNCTION_ARG})(?P<restargcalls>(?:,{FUNCTION_ARG})*)'
FUNCTION_MULTIPLE_ARGS_PATTERN = re.compile(FUNCTION_MULTIPLE_ARGS)
FUNCTION_CALL_LINE_TEMPLATE = r'\s*%s\s*\((?:' + FUNCTION_MULTIPLE_ARGS + r')?\)\s*'
GALAXY_MARKDOWN_FUNCTION_CALL_LINE = re.compile(FUNCTION_CALL_LINE_TEMPLATE % GALAXY_FLAVORED_MARKDOWN_CONTAINER_REGEX)
WHITE_SPACE_ONLY_PATTERN = re.compile(r"^[\s]+$")
[docs]def validate_galaxy_markdown(galaxy_markdown, internal=True):
"""Validate the supplied markdown and throw an ValueError with reason if invalid."""
expecting_container_close_for = None
last_line_no = 0
function_calls = 0
for (line, fenced, open_fence, line_no) in _split_markdown_lines(galaxy_markdown):
last_line_no = line_no
def invalid_line(template, **kwd):
if "line" in kwd:
kwd["line"] = line.rstrip("\r\n")
raise ValueError("Invalid line %d: %s" % (line_no + 1, template.format(**kwd)))
expecting_container_close = expecting_container_close_for is not None
if not fenced and expecting_container_close:
invalid_line("[{line}] is not expected close line for [{expected_for}]", line=line, expected_for=expecting_container_close_for)
continue
elif not fenced:
continue
elif fenced and expecting_container_close and BLOCK_FENCE_END.match(line):
# reset
expecting_container_close_for = None
function_calls = 0
elif open_fence and GALAXY_FLAVORED_MARKDOWN_CONTAINER_LINE_PATTERN.match(line):
if expecting_container_close:
if not VALID_CONTAINER_END_PATTERN.match(line):
invalid_line("Invalid command close line [{line}] for [{expected_for}]", line=line, expected_for=expecting_container_close_for)
# else closing container and we're done
expecting_container_close_for = None
function_calls = 0
continue
expecting_container_close_for = line
continue
elif fenced and line and expecting_container_close_for:
func_call_match = GALAXY_MARKDOWN_FUNCTION_CALL_LINE.match(line)
if func_call_match:
function_calls += 1
if function_calls > 1:
invalid_line("Only one Galaxy directive is allowed per fenced Galaxy block (```galaxy)")
container = func_call_match.group("container")
valid_args = VALID_ARGUMENTS[container]
if valid_args is DYNAMIC_ARGUMENTS:
continue
first_arg_call = func_call_match.group("firstargcall")
def _validate_arg(arg_str):
if arg_str is not None:
arg_name = arg_str.split("=", 1)[0].strip()
if arg_name not in valid_args:
invalid_line("Invalid argument to Galaxy directive [{argument}]", argument=arg_name)
_validate_arg(first_arg_call)
rest = func_call_match.group("restargcalls")
while rest:
rest = rest.strip().split(",", 1)[1]
arg_match = FUNCTION_MULTIPLE_ARGS_PATTERN.match(rest)
if not arg_match:
break
first_arg_call = arg_match.group("firstargcall")
_validate_arg(first_arg_call)
rest = arg_match.group("restargcalls")
continue
else:
invalid_line("Invalid embedded Galaxy markup line [{line}]", line=line)
# Markdown unrelated to Galaxy object containers.
continue
if expecting_container_close_for:
template = "Invalid line %d: %s"
msg = template % (last_line_no, f"close of block for [{expecting_container_close_for}] expected")
raise ValueError(msg)
def _split_markdown_lines(markdown):
"""Yield lines of a markdown document line-by-line keeping track of fencing.
'Fenced' lines are code-like block (e.g. between ```) that shouldn't contain
Markdown markup.
"""
block_fenced = False
indent_fenced = False
for line_number, line in enumerate(markdown.splitlines(True)):
open_fence_this_iteration = False
indent_fenced = line.startswith(" ") or (indent_fenced and WHITE_SPACE_ONLY_PATTERN.match(line))
if not block_fenced:
if BLOCK_FENCE_START.match(line):
open_fence_this_iteration = True
block_fenced = True
yield (line, block_fenced or indent_fenced, open_fence_this_iteration, line_number)
if not open_fence_this_iteration and BLOCK_FENCE_END.match(line):
block_fenced = False
__all__ = (
'validate_galaxy_markdown',
'GALAXY_MARKDOWN_FUNCTION_CALL_LINE',
)