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Contents
# frozen_string_literal: true
module Asciidoctor
module PDF
module Measurements
MeasurementValueRx = /(\d+|\d*\.\d+)(in|mm|cm|p[txc])?$/
InsetMeasurementValueRx = /(?<=^| |\()(-?\d+(?:\.\d+)?)(in|mm|cm|p[txc])(?=$| |\))/
MeasurementValueHintRx = /\d(in|mm|cm|p[txc])/
# Convert the specified string value to a pt value from the
# specified unit of measurement (e.g., in, cm, mm, etc).
# If the unit of measurement is not recognized, assume pt.
#
# Examples:
#
# 0.5in => 36.0
# 100px => 75.0
# 72blah => 72.0
#
def str_to_pt val
MeasurementValueRx =~ val ? (to_pt $1.to_f, $2) : val.to_f
end
# Converts the specified float value to a pt value from the
# specified unit of measurement (e.g., in, cm, mm, etc).
# Raises an argument error if the unit of measurement is not recognized.
def to_pt num, units
units = units.to_s if ::Symbol === units
if units.nil_or_empty?
num
else
case units
when 'pt'
num
when 'in'
num * 72
when 'mm'
num * (72 / 25.4)
when 'cm'
num * (720 / 25.4)
when 'px'
# assuming canvas of 96 dpi
num * 0.75
when 'pc'
num * 12
else
raise ::ArgumentError, %(unknown unit of measurement: #{units})
end
end
end
# Resolve measurement values in the string to PDF points.
def resolve_measurement_values str
if MeasurementValueHintRx.match? str
str.gsub(InsetMeasurementValueRx) { to_pt $1.to_f, $2 }
else
str
end
end
end
end
end
Version data entries
54 entries across 54 versions & 1 rubygems