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spaCy
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spaCy/spacy/displacy/render.py

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# coding: utf8
from __future__ import unicode_literals
import random
from .templates import TPL_DEP_SVG, TPL_DEP_WORDS, TPL_DEP_ARCS
from .templates import TPL_ENT, TPL_ENTS, TPL_FIGURE, TPL_TITLE, TPL_PAGE
from ..util import minify_html, escape_html
class DependencyRenderer(object):
"""Render dependency parses as SVGs."""
style = "dep"
def __init__(self, options={}):
"""Initialise dependency renderer.
options (dict): Visualiser-specific options (compact, word_spacing,
arrow_spacing, arrow_width, arrow_stroke, distance, offset_x,
color, bg, font)
"""
self.compact = options.get("compact", False)
self.word_spacing = options.get("word_spacing", 45)
self.arrow_spacing = options.get("arrow_spacing", 12 if self.compact else 20)
self.arrow_width = options.get("arrow_width", 6 if self.compact else 10)
self.arrow_stroke = options.get("arrow_stroke", 2)
self.distance = options.get("distance", 150 if self.compact else 175)
self.offset_x = options.get("offset_x", 50)
self.color = options.get("color", "#000000")
self.bg = options.get("bg", "#ffffff")
self.font = options.get("font", "Arial")
def render(self, parsed, page=False, minify=False):
"""Render complete markup.
parsed (list): Dependency parses to render.
page (bool): Render parses wrapped as full HTML page.
minify (bool): Minify HTML markup.
RETURNS (unicode): Rendered SVG or HTML markup.
"""
# Create a random ID prefix to make sure parses don't receive the
# same ID, even if they're identical
id_prefix = random.randint(0, 999)
rendered = [
self.render_svg("{}-{}".format(id_prefix, i), p["words"], p["arcs"])
for i, p in enumerate(parsed)
]
if page:
content = "".join([TPL_FIGURE.format(content=svg) for svg in rendered])
markup = TPL_PAGE.format(content=content)
else:
markup = "".join(rendered)
if minify:
return minify_html(markup)
return markup
def render_svg(self, render_id, words, arcs):
"""Render SVG.
render_id (int): Unique ID, typically index of document.
words (list): Individual words and their tags.
arcs (list): Individual arcs and their start, end, direction and label.
RETURNS (unicode): Rendered SVG markup.
"""
self.levels = self.get_levels(arcs)
self.highest_level = len(self.levels)
self.offset_y = self.distance / 2 * self.highest_level + self.arrow_stroke
self.width = self.offset_x + len(words) * self.distance
self.height = self.offset_y + 3 * self.word_spacing
self.id = render_id
words = [self.render_word(w["text"], w["tag"], i) for i, w in enumerate(words)]
arcs = [
self.render_arrow(a["label"], a["start"], a["end"], a["dir"], i)
for i, a in enumerate(arcs)
]
content = "".join(words) + "".join(arcs)
return TPL_DEP_SVG.format(
id=self.id,
width=self.width,
height=self.height,
color=self.color,
bg=self.bg,
font=self.font,
content=content,
)
def render_word(self, text, tag, i):
"""Render individual word.
text (unicode): Word text.
tag (unicode): Part-of-speech tag.
i (int): Unique ID, typically word index.
RETURNS (unicode): Rendered SVG markup.
"""
y = self.offset_y + self.word_spacing
x = self.offset_x + i * self.distance
html_text = escape_html(text)
return TPL_DEP_WORDS.format(text=html_text, tag=tag, x=x, y=y)
def render_arrow(self, label, start, end, direction, i):
"""Render indivicual arrow.
label (unicode): Dependency label.
start (int): Index of start word.
end (int): Index of end word.
direction (unicode): Arrow direction, 'left' or 'right'.
i (int): Unique ID, typically arrow index.
RETURNS (unicode): Rendered SVG markup.
"""
level = self.levels.index(end - start) + 1
x_start = self.offset_x + start * self.distance + self.arrow_spacing
y = self.offset_y
x_end = (
self.offset_x
+ (end - start) * self.distance
+ start * self.distance
- self.arrow_spacing * (self.highest_level - level) / 4
)
y_curve = self.offset_y - level * self.distance / 2
if self.compact:
y_curve = self.offset_y - level * self.distance / 6
if y_curve == 0 and len(self.levels) > 5:
y_curve = -self.distance
arrowhead = self.get_arrowhead(direction, x_start, y, x_end)
arc = self.get_arc(x_start, y, y_curve, x_end)
return TPL_DEP_ARCS.format(
id=self.id,
i=i,
stroke=self.arrow_stroke,
head=arrowhead,
label=label,
arc=arc,
)
def get_arc(self, x_start, y, y_curve, x_end):
"""Render individual arc.
x_start (int): X-coordinate of arrow start point.
y (int): Y-coordinate of arrow start and end point.
y_curve (int): Y-corrdinate of Cubic Bézier y_curve point.
x_end (int): X-coordinate of arrow end point.
RETURNS (unicode): Definition of the arc path ('d' attribute).
"""
template = "M{x},{y} C{x},{c} {e},{c} {e},{y}"
if self.compact:
template = "M{x},{y} {x},{c} {e},{c} {e},{y}"
return template.format(x=x_start, y=y, c=y_curve, e=x_end)
def get_arrowhead(self, direction, x, y, end):
"""Render individual arrow head.
direction (unicode): Arrow direction, 'left' or 'right'.
x (int): X-coordinate of arrow start point.
y (int): Y-coordinate of arrow start and end point.
end (int): X-coordinate of arrow end point.
RETURNS (unicode): Definition of the arrow head path ('d' attribute).
"""
if direction == "left":
pos1, pos2, pos3 = (x, x - self.arrow_width + 2, x + self.arrow_width - 2)
else:
pos1, pos2, pos3 = (
end,
end + self.arrow_width - 2,
end - self.arrow_width + 2,
)
arrowhead = (
pos1,
y + 2,
pos2,
y - self.arrow_width,
pos3,
y - self.arrow_width,
)
return "M{},{} L{},{} {},{}".format(*arrowhead)
def get_levels(self, arcs):
"""Calculate available arc height "levels".
Used to calculate arrow heights dynamically and without wasting space.
args (list): Individual arcs and their start, end, direction and label.
RETURNS (list): Arc levels sorted from lowest to highest.
"""
levels = set(map(lambda arc: arc["end"] - arc["start"], arcs))
return sorted(list(levels))
class EntityRenderer(object):
"""Render named entities as HTML."""
style = "ent"
def __init__(self, options={}):
"""Initialise dependency renderer.
options (dict): Visualiser-specific options (colors, ents)
"""
colors = {
"ORG": "#7aecec",
"PRODUCT": "#bfeeb7",
"GPE": "#feca74",
"LOC": "#ff9561",
"PERSON": "#aa9cfc",
"NORP": "#c887fb",
"FACILITY": "#9cc9cc",
"EVENT": "#ffeb80",
"LAW": "#ff8197",
"LANGUAGE": "#ff8197",
"WORK_OF_ART": "#f0d0ff",
"DATE": "#bfe1d9",
"TIME": "#bfe1d9",
"MONEY": "#e4e7d2",
"QUANTITY": "#e4e7d2",
"ORDINAL": "#e4e7d2",
"CARDINAL": "#e4e7d2",
"PERCENT": "#e4e7d2",
}
colors.update(options.get("colors", {}))
self.default_color = "#ddd"
self.colors = colors
self.ents = options.get("ents", None)
def render(self, parsed, page=False, minify=False):
"""Render complete markup.
parsed (list): Dependency parses to render.
page (bool): Render parses wrapped as full HTML page.
minify (bool): Minify HTML markup.
RETURNS (unicode): Rendered HTML markup.
"""
rendered = [
self.render_ents(p["text"], p["ents"], p.get("title", None)) for p in parsed
]
if page:
docs = "".join([TPL_FIGURE.format(content=doc) for doc in rendered])
markup = TPL_PAGE.format(content=docs)
else:
markup = "".join(rendered)
if minify:
return minify_html(markup)
return markup
def render_ents(self, text, spans, title):
"""Render entities in text.
text (unicode): Original text.
spans (list): Individual entity spans and their start, end and label.
title (unicode or None): Document title set in Doc.user_data['title'].
"""
markup = ""
offset = 0
for span in spans:
label = span["label"]
start = span["start"]
end = span["end"]
entity = text[start:end]
fragments = text[offset:start].split("\n")
for i, fragment in enumerate(fragments):
markup += fragment
if len(fragments) > 1 and i != len(fragments) - 1:
markup += "</br>"
if self.ents is None or label.upper() in self.ents:
color = self.colors.get(label.upper(), self.default_color)
markup += TPL_ENT.format(label=label, text=entity, bg=color)
else:
markup += entity
offset = end
markup += text[offset:]
markup = TPL_ENTS.format(content=markup, colors=self.colors)
if title:
markup = TPL_TITLE.format(title=title) + markup
return markup
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