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# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D38057 --HG-- extra : moz-landing-system : lando
389 lines
9.0 KiB
C
389 lines
9.0 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#define TH_UNICODE
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#include <stdlib.h>
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#include <stdint.h>
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#include <assert.h>
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#include "th_char.h"
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#define th_isalpha(c) (((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
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#define th_isspace(c) ((c) == ' ' || (c) == '\t')
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/*
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/////////////////////////////////////////////////
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// Thai character type array
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*/
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typedef unsigned short twb_t;
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extern const twb_t _TwbType[0x100 - 0xa0];
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/*
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// bit definition
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*/
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#define VRS 0x0001
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#define VRE 0x0002
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#define VRX 0x0004
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#define VRA 0x0008
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#define VLA 0x0010
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#define VLO 0x0020
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#define VLI 0x0040
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#define VC 0x0080
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#define CC 0x0100
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#define CS 0x0200
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#define C2 0x0400
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#define CHB 0x0800
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#define CHE 0x1000
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#define MT 0x2000
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/*
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//_#define me 0x2000
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*/
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#define M 0x4000
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#define T 0x8000
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#define VL (VLA | VLO | VLI)
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#define VR (VRS | VRE | VRX)
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#define NE (VL | VRS)
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#define NB (VR | M)
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#define V (VL | VR)
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#define CX (CC | CS)
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#define C (CX | VC)
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#define A (C | V | M)
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#define twbtype(c) (_TwbType[th_zcode(c)])
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#ifndef TRUE
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# define TRUE 1
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# define FALSE 0
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#endif
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#define RETURN(b) return (b)
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/*
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/////////////////////////////////////////////////
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*/
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int TrbWordBreakPos(const th_char* pstr, int left, const th_char* rstr,
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int right)
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/* const ThBreakIterator *it, const th_char **p)*/
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{
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/*
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//int left, right;
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//const th_char *s = *p;
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*/
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const th_char* lstr = pstr + left;
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th_char _c[6];
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twb_t _t[6];
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#define c(i) (_c[(i) + 3])
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#define t(i) (_t[(i) + 3])
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int i, j;
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/*
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//left = s - it->begin;
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*/
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if (left < 0) return -1;
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/*
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//right = (it->end == NULL) ? 4 : it->begin - s;
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*/
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if (right < 1) return -1;
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/*
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// get c(0), t(0)
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*/
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c(0) = rstr[0]; /* may be '\0' */
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if (!th_isthai(c(0))) return -1;
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t(0) = twbtype(c(0));
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if (!(t(0) & A)) return -1;
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/*
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// get c(-1), t(-1)
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*/
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if (left >= 1) {
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c(-1) = lstr[-1];
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if (!th_isthai(c(-1))) return 0;
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t(-1) = twbtype(c(-1));
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if (!(t(-1) & A)) return 0; /* handle punctuation marks here */
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} else {
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c(-1) = 0;
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t(-1) = 0;
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}
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/*
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// get c(1..2), t(1..2)
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*/
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for (i = 1; i <= 2; i++) {
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if (i >= right) {
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c(i) = 0;
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t(i) = 0;
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} else {
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c(i) = rstr[i]; /* may be '\0'; */
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if (!th_isthai(c(i)))
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right = i--;
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else {
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t(i) = twbtype(c(i));
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if (!(t(i) & A)) right = i--;
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}
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}
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}
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/*
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// get c(-2..-3), t(-2..-3)
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*/
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for (i = -2, j = -2; i >= -3; j--) {
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if (j < -left) {
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c(i) = 0;
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t(i) = 0;
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i--;
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} else {
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c(i) = lstr[j];
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if (!th_isthai(c(i)))
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left = 0;
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else {
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t(i) = (twb_t)(th_isthai(c(i)) ? twbtype(c(i)) : 0);
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if (!(t(i) & A))
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left = 0;
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else {
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if ((t(i + 1) & MT) && ((t(i) & VR) || (t(i + 2) & VR))) {
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c(i + 1) = c(i);
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t(i + 1) = t(i);
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} else
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i--;
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}
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}
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}
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}
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/*
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// prohibit the unlikely
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*/
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if ((t(-1) & C) && (t(0) & C)) {
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if ((t(-1) & CHE) || (t(0) & CHB)) return -1;
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}
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/*
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// special case : vlao, C/ sara_a|aa, !sara_a
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*/
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if ((t(-3) & (VLA | VLO)) && (t(-2) & C) && (c(0) != TH_SARA_A) &&
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(c(-1) == TH_SARA_A || c(-0) == TH_SARA_AA))
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return 0;
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/*
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// prohibit break
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*/
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if (t(0) & NB) return -1;
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if (t(-1) & NE) return -1;
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/*
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// apply 100% rules
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*/
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if (t(-1) & VRE) {
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if (c(-2) == TH_SARA_AA && c(-1) == TH_SARA_A) return 0;
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return -1; /* usually too short syllable, part of word */
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}
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if (t(-2) & VRE) return -1;
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if ((t(0) & C) && (t(1) & (VR | MT)) &&
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(c(2) != TH_THANTHAKHAT)) { /*?C, NB */
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if ((t(-1) & (VRS | VRX)) && c(1) == TH_SARA_I) return -1; /* exception */
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if (t(-1) & (V | M)) return 0; /* !C/ C, NB */
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if (t(-2) & VRS) return 0; /* VRS, C / C, NB */
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if (!(t(0) & C2) && c(1) == TH_SARA_I) { /* / !C2 or /c, sara_i */
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if (t(-2) & VRX) return 0; /* VRX, C / C, NB ? 100%? */
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if (t(-2) & VC) return 0; /* VC, C / C, NB ? 100% */
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}
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}
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if ((t(-1) & VRX) && (t(0) & CC)) return 0; /* VRX/ CC */
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if ((t(-2) & VRS) && (t(-1) & C) && (t(0) & (V | M)))
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return 0; /* VRS, C/ !C */
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if ((t(0) & CX) && (t(1) & C2) && (c(2) != TH_THANTHAKHAT)) {
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if ((t(-2) & A) && (t(-1) & CX)) return 0; /* A, CX / CX, C2 */
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if ((t(-2) & CX) && (t(-1) & MT)) return 0; /* CX, MT / CX, C2 */
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}
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/*
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// apply 90% rules
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*/
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if (t(0) & VL) return 0;
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if (t(1) & VL) return -1;
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if (c(-1) == TH_THANTHAKHAT && c(-2) != TH_RORUA && c(-2) != TH_LOLING)
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return 0;
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/*
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//return -1;
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// apply 80% rules
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*/
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if (t(0) & CHE) {
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if ((t(-2) & VRS) && (t(-1) & C)) return 0; /* VRS, C/ CHE */
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/*if(t(-1) & VRX) return 0; // VRX/ CHE */
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if (t(-1) & VC) return 0; /* VC/ CHE */
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}
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if (t(-1) & CHB) {
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if ((t(0) & C) && (t(1) & VR)) return 0; /* CHB/ CC, VR */
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if (t(0) & VC) return 0; /* CHB/ VC */
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}
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if ((t(-2) & VL) && (t(1) & VR)) { /* VL, C? C, VR */
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if (t(-2) & VLI)
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return 0; /* VLI,C/C,VR .*/
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else { /* vlao, C ? C , VR */
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if (c(1) == TH_SARA_A) return 2; /* vlao, C, C, sara_a/ */
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if (t(-2) & VLO) return 0; /* VLO, C/ C, !sara_a */
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if (!(t(1) & VRA)) return 0; /* VLA, C/ C, !vca */
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}
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}
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/* C,MT,C */
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if ((t(-2) & C) && (t(-1) & MT) && (t(0) & CX)) return 1;
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return -1;
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}
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int TrbFollowing(const th_char* begin, int length, int offset)
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/*
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//(ThBreakIterator *this, int offset)
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*/
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{
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const th_char* w = begin + offset;
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const th_char* end = begin + length;
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while (w < end && *w && !th_isthai(*w) && th_isspace(*w)) w++;
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if (w < end && *w && !th_isthai(*w)) {
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int english = FALSE;
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while (w < end && *w && !th_isthai(*w) && !th_isspace(*w)) {
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if (th_isalpha(*w)) english = TRUE;
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w++;
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}
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if (english || w == end || (!th_isthai(*w) && th_isspace(*w)))
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return w - begin;
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}
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if (w == end || *w == 0 || !th_isthai(*w)) return w - begin;
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w++;
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if (w < end && *w && th_isthai(*w)) {
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int brk = TrbWordBreakPos(begin, w - begin, w, end - w);
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while (brk < 0) {
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w++;
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if (w == end || *w == 0 || !th_isthai(*w)) break;
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brk = TrbWordBreakPos(begin, w - begin, w, end - w);
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}
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if (brk > 0) w += brk;
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}
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if (w < end && *w && !th_isthai(*w)) {
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while (w < end && *w && !th_isthai(*w) && !th_isalpha(*w) &&
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!th_isspace(*w))
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w++;
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}
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return w - begin;
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}
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/*
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/////////////////////////////////////////////////
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*/
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const twb_t _TwbType[0x100 - 0xa0] = {
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#if 0
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/* 80 */ T,
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/* 81-8f */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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/* 90 */ T,
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/* 91-9f */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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#endif
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/* a0 */ 0,
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/* a1 ¡ */ CS,
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/* a2 ¢ */ CS | CHE,
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/* a3 £ */ CC | CHE,
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/* a4 € */ CS | CHE,
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/* a5 ¥ */ CC | CHE,
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/* a6 Š */ CS,
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/* a7 § */ CS | CHB,
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/* a8 š */ CS,
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/* a9 © */ CC | CHE,
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/* aa ª */ CS,
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/* ab « */ CC | CHE,
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/* ac ¬ */ CC | CHB | CHE,
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/* ad */ CS | CHB,
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/* ae ® */ CS | CHB,
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/* af ¯ */ CS | CHB,
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/* b0 ° */ CS,
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/* b1 ± */ CS | CHB | CHE,
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/* b2 ² */ CS | CHB | CHE,
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/* b3 ³ */ CS | CHB,
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/* b4 Ž */ CS,
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/* b5 µ */ CS,
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/* b6 ¶ */ CS,
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/* b7 · */ CS,
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/* b8 ž */ CS,
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/* b9 ¹ */ CS,
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/* ba º */ CS,
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/* bb » */ CS,
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/* bc Π*/ CC | CHE,
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/* bd œ */ CC | CHE,
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/* be Ÿ */ CS,
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/* bf ¿ */ CS,
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/* c0 À */ CS | CHE,
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/* c1 Á */ CS,
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/* c2 Â */ CS,
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/* c3 Ã */ CS | C2 | CHE, /* ? add CHE */
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/* c4 Ä */ VC | CHE,
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/* c5 Å */ CS | C2,
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/* c6 Æ */ VC | CHE,
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/* c7 Ç */ VC | C2,
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/* c8 È */ CS,
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/* c9 É */ CS | CHB,
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/* ca Ê */ CS | CHE,
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/* cb Ë */ CC | CHE,
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/* CC Ì */ CS | CHB | CHE,
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/* cd Í */ VC,
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/* ce Î */ CC | CHE,
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/* cf Ï */ T,
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/* d0 Ð */ VRE | VRA,
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/* d1 Ñ */ VRS,
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/* d2 Ò */ VRX | VRA,
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/* d3 Ó */ VRE,
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/* d4 Ô */ VRX | VRA,
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/* d5 Õ */ VRX | VRA,
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/* d6 Ö */ VRS,
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/* d7 × */ VRS | VRA,
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/* d8 Ø */ VRX,
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/* d9 Ù */ VRX,
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/* da Ú */ T,
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/* db Û */ 0,
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/* dc Ü */ 0,
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/* dd Ý */ 0,
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/* de Þ */ 0,
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/* df ß */ T,
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/* e0 à */ VLA,
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/* e1 á */ VLO,
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/* e2 â */ VLO,
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/* e3 ã */ VLI,
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/* e4 ä */ VLI,
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/* e5 å */ VRE,
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/* e6 æ */ M,
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/* e7 ç */ M,
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/* e8 è */ M | MT,
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/* e9 é */ M | MT,
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/* ea ê */ M | MT,
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/* eb ë */ M | MT,
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/* ec ì */ M,
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/* ed í */ T,
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/* ee î */ T,
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/* ef ï */ T,
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/* f0 ð */ T,
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/* f1 ñ */ T,
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/* f2 ò */ T,
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/* f3 ó */ T,
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/* f4 ô */ T,
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/* f5 õ */ T,
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/* f6 ö */ T,
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/* f7 ÷ */ T,
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/* f8 ø */ T,
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/* f9 ù */ T,
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/* fa ú */ T,
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/* fb û */ T,
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/* fc ü */ 0,
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/* fd ý */ 0,
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/* fe þ */ 0,
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/* ff */ 0};
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