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ttree_render.py
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Mon, Aug 5, 18:41

ttree_render.py
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#!/usr/bin/env python
man_page_text = """
Usage (example):
ttree_render.py ttree_assignments.txt < file.template > file.rendered
The argument (ttree_assignments.txt) should be a 2-column file containing
ttree-style variables (1st column), and their values (bindings, 2nd column).
This program reads a text file containing ttree-style variables,
substitutes the corresponding values stored in ttree_assignments.txt,
and prints out the new (rendered) text to the standard-out.
"""
import sys
from ttree_lex import *
from ttree import *
import gc
g_filename = __file__.split('/')[-1]
g_module_name = g_filename
if g_filename.rfind('.py') != -1:
g_module_name = g_filename[:g_filename.rfind('.py')]
g_date_str = '2012-9-06'
g_version_str = '0.1'
g_program_name = g_filename
#sys.stderr.write(g_program_name+' v'+g_version_str+' '+g_date_str+' ')
try:
if (len(sys.argv) != 2):
raise InputError('Error running \"'+g_program_name+'\"\n'
' Typical usage:\n'
' ttree_render.py ttree_assignments.txt < file.template > file.rendered\n'
'\n'
' Missing argument.\n'
' Expected the name of a 2-column file containing\n'
' variable names and their bindings (values).\n'
' (This is likely a programmer error.\n'
' This script was not intended to be run by end users.)\n')
bindings_filename = sys.argv[1]
f = open(bindings_filename)
assignments = {}
#BasicUIReadBindingsStream(assignments, f, bindings_filename)
# The line above is robust but it uses far too much memory.
# This for loop below works for most cases.
for line in f:
#tokens = lines.strip().split()
tokens = SplitQuotedString(line.strip()) # like split but handles quotes
if len(tokens) < 2:
continue
assignments[tokens[0]] = tokens[1]
f.close()
gc.collect()
lex = TemplateLexer(sys.stdin, '__standard_input_for_ttree_render__')
lex.var_delim = '$@'
text_block_list = lex.ReadTemplate(simplify_output=True)
output = []
for entry in text_block_list:
assert(isinstance(entry, str))
if ((len(entry) > 1) and (entry[0] in lex.var_delim)):
if '.' in entry:
ic = entry.find('.')
var_name = entry[:ic]
var_suffix = entry[ic:]
else:
var_name = entry
var_suffix = ''
var_name = entry
if var_name not in assignments:
raise(InputError('Error('+g_program_name+')'
#' at '+ErrorLeader(var_ref.src_loc.infile,
# var_ref.src_loc.lineno)+
' unknown variable:\n'
' \"'+var_name+'\"\n'))
else:
var_value = assignments[var_name]
format_fname, args = ExtractFormattingCommands(var_suffix)
if format_fname == 'ljust':
if len(args) == 1:
var_value = var_value.ljust(int(args[0]))
else:
var_value = var_value.ljust(int(args[0]), args[1])
elif format_fname == 'rjust':
if len(args) == 1:
var_value = var_value.rjust(int(args[0]))
else:
var_value = var_value.rjust(int(args[0]), args[1])
output.append(var_value)
else:
output += entry
sys.stdout.write(''.join(output))
except (ValueError, InputError) as err:
sys.stderr.write('\n'+str(err)+'\n')
sys.exit(-1)

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