A python script to modify gplates files to shift all dates or flip east and west

gplates_mod.py

import fileinput
import os

#shifts all dates while not modifying any set to 0.0 and not moving any other dates forward of 0.01
timeshift = False

#amount to be shifted (positive shifts back in time, negative forward in time)
shift = -100.0

#flips east and west of all objects and rotations
flip = False

#script should be placed in folder with all files intended for modification
path = os.path.join(os.path.dirname(__file__), '')
files = []
for f in os.listdir(path):
    if f.endswith('.gpml'):
        files.append(f)

if timeshift:
    for line in fileinput.input('rotation.rot', inplace=True):
        new_line = line
        i=0
        i1=0
        i2=0
        start=False
        space=False
        for c in line:
            if not start:
                if c == ' ' or c == '/t':
                    space = True
                elif space:
                    start = True
                    i1 = i
            else:
                if c.isnumeric() or c == '-' or c == '.':
                    pass
                else:
                    i2 = i
                    num = float(line[i1:i2])
                    if num == 0.0:
                        break
                    new_num = max(0.01, num + shift)
                    new_line = line[:i1] + str(round(new_num,2)) + line[i2:]
                    break
            i+=1
        print (new_line, end = '')
    fileinput.close()

    for line in fileinput.input(files, inplace=True):
        new_line = line
        if '<gml:timePosition gml:frame="http://gplates.org/TRS/flat">' in line:
            i=0
            start = False
            first = True
            i1=0
            i2=0
            for c in line:
                if not start:
                    if c == '>':
                        start = True
                else:
                    if c.isnumeric() or c == '-' or c == '.':
                        if first:
                            i1 = i
                            first = False
                    elif c == '<':
                        i2 = i
                        num = float(line[i1:i2])
                        if num == 0.0:
                            break
                        new_num = max(0.01, num + shift)
                        new_line = line[:i1] + str(round(new_num,2)) + line[i2:]
                        break
                    else:
                        break
                i+=1
        print (new_line, end = '')
    fileinput.close()

if flip:
    for line in fileinput.input('rotation.rot', inplace=True):
        new_line = line
        i=0
        w=0
        s=False
        for c in line:
            if c == ' ' or c == '/t':
                if not s:
                    s = True
                    w += 1
            else:
                if s:
                    s = False
                    if w == 3 or w == 4:
                        if c == '-':
                            new_line = new_line[:i] + new_line[i+1:]
                            i -= 1
                        else:
                            new_line = new_line[:i] + '-' + new_line[i:]
                            i += 1
            i+=1
        print (new_line, end = '')
    fileinput.close()
        



    for line in fileinput.input(files, inplace=True):
        new_line = line
        if '<gml:posList gml:dimension="2">' in line or '<gml:pos>' in line:
            i=0
            start = False
            space = True
            word = False
            for c in line:
                if not start:
                    if c == '>':
                        start = True
                else:
                    if c == '<':
                        start = False
                        continue
                    if c == ' ':
                        space = True
                    elif space == True:
                        space = False
                        if word:
                            if c == '-':
                                new_line = new_line[:i] + new_line[i+1:]
                                i-=1
                            else:
                                new_line = new_line[:i] + '-' + new_line[i:]
                                i+=1
                            word = False
                        else:
                            word = True
                i+=1
        print (new_line, end = '')
    fileinput.close()