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main.py
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main.py
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import os
import sys
import base64
import codecs
import asyncio
from io import BytesIO
import pyecharts_snapshot.logger as logger
from PIL import Image
from pyppeteer import launch
DEFAULT_DELAY = 1.5
DEFAULT_PIXEL_RATIO = 2
PNG_FORMAT = "png"
JPG_FORMAT = "jpeg"
GIF_FORMAT = "gif"
PDF_FORMAT = "pdf"
SVG_FORMAT = "svg"
EPS_FORMAT = "eps"
B64_FORMAT = "base64"
SUPPORTED_IMAGE_FORMATS = [
PNG_FORMAT,
JPG_FORMAT,
GIF_FORMAT,
PDF_FORMAT,
SVG_FORMAT,
EPS_FORMAT,
B64_FORMAT,
]
HELP_TEXT = """
Usage: snapshot input file [%s] [delay] [pixel ratio]
snapshot help: display this help message
Parameters:
delay: float value, unit in seconds and defaults 1.5 seconds
pixel ratio: integer value, defaults to 2
document online:github.com/pyecharts/pyecharts-snapshot
""".format(
"|".join(SUPPORTED_IMAGE_FORMATS)
)
DEFAULT_OUTPUT_NAME = "output.%s"
NOT_SUPPORTED_FILE_TYPE = "Not supported file type '%s'"
MESSAGE_GENERATING = "Generating file ..."
MESSAGE_FILE_SAVED_AS = "File saved in %s"
SNAPSHOT_JS = """
async () => {
const getEcharts = () => {
var ele = document.querySelector('div[_echarts_instance_]');
var mychart = echarts.getInstanceByDom(ele);
return mychart.getDataURL({
type: '%s',
pixelRatio: %s,
excludeComponents: ['toolbox']
});
}
const delayedFunction = () => {
return new Promise(function(resolve, reject){
window.setTimeout(() => resolve(getEcharts()), %d);
});
}
return await delayedFunction();
}
"""
SNAPSHOT_SVG_JS = """
async () => {
const getEcharts = () => {
var element = document.querySelector('div[_echarts_instance_] div');
return element.innerHTML;
}
const delayedFunction = () => {
return new Promise(function(resolve, reject){
window.setTimeout(() => resolve(getEcharts()), %d);
});
}
return await delayedFunction();
}
"""
def main():
asyncio.get_event_loop().run_until_complete(_main())
async def _main():
if len(sys.argv) < 2 or len(sys.argv) > 5:
show_help()
file_name = sys.argv[1]
if file_name == "help":
show_help()
delay = DEFAULT_DELAY
output = DEFAULT_OUTPUT_NAME % PNG_FORMAT
pixel_ratio = DEFAULT_PIXEL_RATIO
if len(sys.argv) >= 3:
file_type = sys.argv[2]
if file_type in SUPPORTED_IMAGE_FORMATS:
output = DEFAULT_OUTPUT_NAME % file_type
elif file_type != PNG_FORMAT:
raise TypeError(NOT_SUPPORTED_FILE_TYPE % file_type)
if len(sys.argv) >= 4:
delay = float(sys.argv[3]) # in seconds
if len(sys.argv) == 5:
pixel_ratio = sys.argv[4]
await make_a_snapshot(
file_name, output, delay=delay, pixel_ratio=pixel_ratio
)
def show_help():
logger.info(HELP_TEXT)
exit(0)
async def make_a_snapshot(
file_name: str,
output_name: str,
delay: float = DEFAULT_DELAY,
pixel_ratio: int = DEFAULT_PIXEL_RATIO,
verbose: bool = True,
):
logger.VERBOSE = verbose
logger.info(MESSAGE_GENERATING)
file_type = output_name.split(".")[-1]
content = await async_make_snapshot(
file_name, file_type, pixel_ratio, delay
)
if file_type in [SVG_FORMAT, B64_FORMAT]:
save_as_text(content, output_name)
else:
# pdf, gif, png, jpeg
content_array = content.split(",")
if len(content_array) != 2:
raise OSError(content_array)
base64_imagedata = content_array[1]
imagedata = decode_base64(base64_imagedata)
if file_type in [PDF_FORMAT, GIF_FORMAT, EPS_FORMAT]:
save_as(imagedata, output_name, file_type)
elif file_type in [PNG_FORMAT, JPG_FORMAT]:
save_as_png(imagedata, output_name)
else:
pass
if "/" not in output_name:
output_name = os.path.join(os.getcwd(), output_name)
logger.info(MESSAGE_FILE_SAVED_AS % output_name)
async def async_make_snapshot(
html_path: str, file_type: str, pixel_ratio: int = 2, delay: int = 2
):
__actual_delay_in_ms = int(delay * 1000)
if file_type == "svg":
snapshot_js = SNAPSHOT_SVG_JS % __actual_delay_in_ms
else:
snapshot_js = SNAPSHOT_JS % (
file_type,
pixel_ratio,
__actual_delay_in_ms,
)
return await get_echarts(to_file_uri(html_path), snapshot_js)
async def get_echarts(url: str, snapshot_js: str):
browser = await launch()
page = await browser.newPage()
await page.goto(url)
content = await page.evaluate(snapshot_js)
await browser.close()
return content
def decode_base64(data: str) -> bytes:
"""Decode base64, padding being optional.
:param data: Base64 data as an ASCII byte string
:returns: The decoded byte string.
"""
missing_padding = len(data) % 4
if missing_padding != 0:
data += "=" * (4 - missing_padding)
return base64.decodestring(data.encode("utf-8"))
def save_as_png(imagedata: bytes, output_name: str):
with open(output_name, "wb") as f:
f.write(imagedata)
def save_as_text(imagedata: str, output_name: str):
with codecs.open(output_name, "w", encoding="utf-8") as f:
f.write(imagedata)
def save_as(imagedata: bytes, output_name: str, file_type: str):
m = Image.open(BytesIO(imagedata))
m.load()
color = (255, 255, 255)
b = Image.new("RGB", m.size, color)
b.paste(m, mask=m.split()[3])
b.save(output_name, file_type, quality=100)
def to_file_uri(a_file_name: str) -> str:
__universal_file_name = a_file_name.replace("\\", "/")
if ":" not in a_file_name:
__universal_file_name = os.path.abspath(__universal_file_name)
return "file:///{0}".format(__universal_file_name)